Merge branch 'en/rebase-consistency'
[git] / apply.c
1 /*
2  * apply.c
3  *
4  * Copyright (C) Linus Torvalds, 2005
5  *
6  * This applies patches on top of some (arbitrary) version of the SCM.
7  *
8  */
9
10 #include "cache.h"
11 #include "config.h"
12 #include "object-store.h"
13 #include "blob.h"
14 #include "delta.h"
15 #include "diff.h"
16 #include "dir.h"
17 #include "xdiff-interface.h"
18 #include "ll-merge.h"
19 #include "lockfile.h"
20 #include "parse-options.h"
21 #include "quote.h"
22 #include "rerere.h"
23 #include "apply.h"
24
25 static void git_apply_config(void)
26 {
27         git_config_get_string_const("apply.whitespace", &apply_default_whitespace);
28         git_config_get_string_const("apply.ignorewhitespace", &apply_default_ignorewhitespace);
29         git_config(git_default_config, NULL);
30 }
31
32 static int parse_whitespace_option(struct apply_state *state, const char *option)
33 {
34         if (!option) {
35                 state->ws_error_action = warn_on_ws_error;
36                 return 0;
37         }
38         if (!strcmp(option, "warn")) {
39                 state->ws_error_action = warn_on_ws_error;
40                 return 0;
41         }
42         if (!strcmp(option, "nowarn")) {
43                 state->ws_error_action = nowarn_ws_error;
44                 return 0;
45         }
46         if (!strcmp(option, "error")) {
47                 state->ws_error_action = die_on_ws_error;
48                 return 0;
49         }
50         if (!strcmp(option, "error-all")) {
51                 state->ws_error_action = die_on_ws_error;
52                 state->squelch_whitespace_errors = 0;
53                 return 0;
54         }
55         if (!strcmp(option, "strip") || !strcmp(option, "fix")) {
56                 state->ws_error_action = correct_ws_error;
57                 return 0;
58         }
59         return error(_("unrecognized whitespace option '%s'"), option);
60 }
61
62 static int parse_ignorewhitespace_option(struct apply_state *state,
63                                                  const char *option)
64 {
65         if (!option || !strcmp(option, "no") ||
66             !strcmp(option, "false") || !strcmp(option, "never") ||
67             !strcmp(option, "none")) {
68                 state->ws_ignore_action = ignore_ws_none;
69                 return 0;
70         }
71         if (!strcmp(option, "change")) {
72                 state->ws_ignore_action = ignore_ws_change;
73                 return 0;
74         }
75         return error(_("unrecognized whitespace ignore option '%s'"), option);
76 }
77
78 int init_apply_state(struct apply_state *state,
79                      struct repository *repo,
80                      const char *prefix)
81 {
82         memset(state, 0, sizeof(*state));
83         state->prefix = prefix;
84         state->repo = repo;
85         state->apply = 1;
86         state->line_termination = '\n';
87         state->p_value = 1;
88         state->p_context = UINT_MAX;
89         state->squelch_whitespace_errors = 5;
90         state->ws_error_action = warn_on_ws_error;
91         state->ws_ignore_action = ignore_ws_none;
92         state->linenr = 1;
93         string_list_init(&state->fn_table, 0);
94         string_list_init(&state->limit_by_name, 0);
95         string_list_init(&state->symlink_changes, 0);
96         strbuf_init(&state->root, 0);
97
98         git_apply_config();
99         if (apply_default_whitespace && parse_whitespace_option(state, apply_default_whitespace))
100                 return -1;
101         if (apply_default_ignorewhitespace && parse_ignorewhitespace_option(state, apply_default_ignorewhitespace))
102                 return -1;
103         return 0;
104 }
105
106 void clear_apply_state(struct apply_state *state)
107 {
108         string_list_clear(&state->limit_by_name, 0);
109         string_list_clear(&state->symlink_changes, 0);
110         strbuf_release(&state->root);
111
112         /* &state->fn_table is cleared at the end of apply_patch() */
113 }
114
115 static void mute_routine(const char *msg, va_list params)
116 {
117         /* do nothing */
118 }
119
120 int check_apply_state(struct apply_state *state, int force_apply)
121 {
122         int is_not_gitdir = !startup_info->have_repository;
123
124         if (state->apply_with_reject && state->threeway)
125                 return error(_("--reject and --3way cannot be used together."));
126         if (state->cached && state->threeway)
127                 return error(_("--cached and --3way cannot be used together."));
128         if (state->threeway) {
129                 if (is_not_gitdir)
130                         return error(_("--3way outside a repository"));
131                 state->check_index = 1;
132         }
133         if (state->apply_with_reject) {
134                 state->apply = 1;
135                 if (state->apply_verbosity == verbosity_normal)
136                         state->apply_verbosity = verbosity_verbose;
137         }
138         if (!force_apply && (state->diffstat || state->numstat || state->summary || state->check || state->fake_ancestor))
139                 state->apply = 0;
140         if (state->check_index && is_not_gitdir)
141                 return error(_("--index outside a repository"));
142         if (state->cached) {
143                 if (is_not_gitdir)
144                         return error(_("--cached outside a repository"));
145                 state->check_index = 1;
146         }
147         if (state->ita_only && (state->check_index || is_not_gitdir))
148                 state->ita_only = 0;
149         if (state->check_index)
150                 state->unsafe_paths = 0;
151
152         if (state->apply_verbosity <= verbosity_silent) {
153                 state->saved_error_routine = get_error_routine();
154                 state->saved_warn_routine = get_warn_routine();
155                 set_error_routine(mute_routine);
156                 set_warn_routine(mute_routine);
157         }
158
159         return 0;
160 }
161
162 static void set_default_whitespace_mode(struct apply_state *state)
163 {
164         if (!state->whitespace_option && !apply_default_whitespace)
165                 state->ws_error_action = (state->apply ? warn_on_ws_error : nowarn_ws_error);
166 }
167
168 /*
169  * This represents one "hunk" from a patch, starting with
170  * "@@ -oldpos,oldlines +newpos,newlines @@" marker.  The
171  * patch text is pointed at by patch, and its byte length
172  * is stored in size.  leading and trailing are the number
173  * of context lines.
174  */
175 struct fragment {
176         unsigned long leading, trailing;
177         unsigned long oldpos, oldlines;
178         unsigned long newpos, newlines;
179         /*
180          * 'patch' is usually borrowed from buf in apply_patch(),
181          * but some codepaths store an allocated buffer.
182          */
183         const char *patch;
184         unsigned free_patch:1,
185                 rejected:1;
186         int size;
187         int linenr;
188         struct fragment *next;
189 };
190
191 /*
192  * When dealing with a binary patch, we reuse "leading" field
193  * to store the type of the binary hunk, either deflated "delta"
194  * or deflated "literal".
195  */
196 #define binary_patch_method leading
197 #define BINARY_DELTA_DEFLATED   1
198 #define BINARY_LITERAL_DEFLATED 2
199
200 /*
201  * This represents a "patch" to a file, both metainfo changes
202  * such as creation/deletion, filemode and content changes represented
203  * as a series of fragments.
204  */
205 struct patch {
206         char *new_name, *old_name, *def_name;
207         unsigned int old_mode, new_mode;
208         int is_new, is_delete;  /* -1 = unknown, 0 = false, 1 = true */
209         int rejected;
210         unsigned ws_rule;
211         int lines_added, lines_deleted;
212         int score;
213         int extension_linenr; /* first line specifying delete/new/rename/copy */
214         unsigned int is_toplevel_relative:1;
215         unsigned int inaccurate_eof:1;
216         unsigned int is_binary:1;
217         unsigned int is_copy:1;
218         unsigned int is_rename:1;
219         unsigned int recount:1;
220         unsigned int conflicted_threeway:1;
221         unsigned int direct_to_threeway:1;
222         unsigned int crlf_in_old:1;
223         struct fragment *fragments;
224         char *result;
225         size_t resultsize;
226         char old_oid_prefix[GIT_MAX_HEXSZ + 1];
227         char new_oid_prefix[GIT_MAX_HEXSZ + 1];
228         struct patch *next;
229
230         /* three-way fallback result */
231         struct object_id threeway_stage[3];
232 };
233
234 static void free_fragment_list(struct fragment *list)
235 {
236         while (list) {
237                 struct fragment *next = list->next;
238                 if (list->free_patch)
239                         free((char *)list->patch);
240                 free(list);
241                 list = next;
242         }
243 }
244
245 static void free_patch(struct patch *patch)
246 {
247         free_fragment_list(patch->fragments);
248         free(patch->def_name);
249         free(patch->old_name);
250         free(patch->new_name);
251         free(patch->result);
252         free(patch);
253 }
254
255 static void free_patch_list(struct patch *list)
256 {
257         while (list) {
258                 struct patch *next = list->next;
259                 free_patch(list);
260                 list = next;
261         }
262 }
263
264 /*
265  * A line in a file, len-bytes long (includes the terminating LF,
266  * except for an incomplete line at the end if the file ends with
267  * one), and its contents hashes to 'hash'.
268  */
269 struct line {
270         size_t len;
271         unsigned hash : 24;
272         unsigned flag : 8;
273 #define LINE_COMMON     1
274 #define LINE_PATCHED    2
275 };
276
277 /*
278  * This represents a "file", which is an array of "lines".
279  */
280 struct image {
281         char *buf;
282         size_t len;
283         size_t nr;
284         size_t alloc;
285         struct line *line_allocated;
286         struct line *line;
287 };
288
289 static uint32_t hash_line(const char *cp, size_t len)
290 {
291         size_t i;
292         uint32_t h;
293         for (i = 0, h = 0; i < len; i++) {
294                 if (!isspace(cp[i])) {
295                         h = h * 3 + (cp[i] & 0xff);
296                 }
297         }
298         return h;
299 }
300
301 /*
302  * Compare lines s1 of length n1 and s2 of length n2, ignoring
303  * whitespace difference. Returns 1 if they match, 0 otherwise
304  */
305 static int fuzzy_matchlines(const char *s1, size_t n1,
306                             const char *s2, size_t n2)
307 {
308         const char *end1 = s1 + n1;
309         const char *end2 = s2 + n2;
310
311         /* ignore line endings */
312         while (s1 < end1 && (end1[-1] == '\r' || end1[-1] == '\n'))
313                 end1--;
314         while (s2 < end2 && (end2[-1] == '\r' || end2[-1] == '\n'))
315                 end2--;
316
317         while (s1 < end1 && s2 < end2) {
318                 if (isspace(*s1)) {
319                         /*
320                          * Skip whitespace. We check on both buffers
321                          * because we don't want "a b" to match "ab".
322                          */
323                         if (!isspace(*s2))
324                                 return 0;
325                         while (s1 < end1 && isspace(*s1))
326                                 s1++;
327                         while (s2 < end2 && isspace(*s2))
328                                 s2++;
329                 } else if (*s1++ != *s2++)
330                         return 0;
331         }
332
333         /* If we reached the end on one side only, lines don't match. */
334         return s1 == end1 && s2 == end2;
335 }
336
337 static void add_line_info(struct image *img, const char *bol, size_t len, unsigned flag)
338 {
339         ALLOC_GROW(img->line_allocated, img->nr + 1, img->alloc);
340         img->line_allocated[img->nr].len = len;
341         img->line_allocated[img->nr].hash = hash_line(bol, len);
342         img->line_allocated[img->nr].flag = flag;
343         img->nr++;
344 }
345
346 /*
347  * "buf" has the file contents to be patched (read from various sources).
348  * attach it to "image" and add line-based index to it.
349  * "image" now owns the "buf".
350  */
351 static void prepare_image(struct image *image, char *buf, size_t len,
352                           int prepare_linetable)
353 {
354         const char *cp, *ep;
355
356         memset(image, 0, sizeof(*image));
357         image->buf = buf;
358         image->len = len;
359
360         if (!prepare_linetable)
361                 return;
362
363         ep = image->buf + image->len;
364         cp = image->buf;
365         while (cp < ep) {
366                 const char *next;
367                 for (next = cp; next < ep && *next != '\n'; next++)
368                         ;
369                 if (next < ep)
370                         next++;
371                 add_line_info(image, cp, next - cp, 0);
372                 cp = next;
373         }
374         image->line = image->line_allocated;
375 }
376
377 static void clear_image(struct image *image)
378 {
379         free(image->buf);
380         free(image->line_allocated);
381         memset(image, 0, sizeof(*image));
382 }
383
384 /* fmt must contain _one_ %s and no other substitution */
385 static void say_patch_name(FILE *output, const char *fmt, struct patch *patch)
386 {
387         struct strbuf sb = STRBUF_INIT;
388
389         if (patch->old_name && patch->new_name &&
390             strcmp(patch->old_name, patch->new_name)) {
391                 quote_c_style(patch->old_name, &sb, NULL, 0);
392                 strbuf_addstr(&sb, " => ");
393                 quote_c_style(patch->new_name, &sb, NULL, 0);
394         } else {
395                 const char *n = patch->new_name;
396                 if (!n)
397                         n = patch->old_name;
398                 quote_c_style(n, &sb, NULL, 0);
399         }
400         fprintf(output, fmt, sb.buf);
401         fputc('\n', output);
402         strbuf_release(&sb);
403 }
404
405 #define SLOP (16)
406
407 static int read_patch_file(struct strbuf *sb, int fd)
408 {
409         if (strbuf_read(sb, fd, 0) < 0)
410                 return error_errno("git apply: failed to read");
411
412         /*
413          * Make sure that we have some slop in the buffer
414          * so that we can do speculative "memcmp" etc, and
415          * see to it that it is NUL-filled.
416          */
417         strbuf_grow(sb, SLOP);
418         memset(sb->buf + sb->len, 0, SLOP);
419         return 0;
420 }
421
422 static unsigned long linelen(const char *buffer, unsigned long size)
423 {
424         unsigned long len = 0;
425         while (size--) {
426                 len++;
427                 if (*buffer++ == '\n')
428                         break;
429         }
430         return len;
431 }
432
433 static int is_dev_null(const char *str)
434 {
435         return skip_prefix(str, "/dev/null", &str) && isspace(*str);
436 }
437
438 #define TERM_SPACE      1
439 #define TERM_TAB        2
440
441 static int name_terminate(int c, int terminate)
442 {
443         if (c == ' ' && !(terminate & TERM_SPACE))
444                 return 0;
445         if (c == '\t' && !(terminate & TERM_TAB))
446                 return 0;
447
448         return 1;
449 }
450
451 /* remove double slashes to make --index work with such filenames */
452 static char *squash_slash(char *name)
453 {
454         int i = 0, j = 0;
455
456         if (!name)
457                 return NULL;
458
459         while (name[i]) {
460                 if ((name[j++] = name[i++]) == '/')
461                         while (name[i] == '/')
462                                 i++;
463         }
464         name[j] = '\0';
465         return name;
466 }
467
468 static char *find_name_gnu(struct apply_state *state,
469                            const char *line,
470                            const char *def,
471                            int p_value)
472 {
473         struct strbuf name = STRBUF_INIT;
474         char *cp;
475
476         /*
477          * Proposed "new-style" GNU patch/diff format; see
478          * http://marc.info/?l=git&m=112927316408690&w=2
479          */
480         if (unquote_c_style(&name, line, NULL)) {
481                 strbuf_release(&name);
482                 return NULL;
483         }
484
485         for (cp = name.buf; p_value; p_value--) {
486                 cp = strchr(cp, '/');
487                 if (!cp) {
488                         strbuf_release(&name);
489                         return NULL;
490                 }
491                 cp++;
492         }
493
494         strbuf_remove(&name, 0, cp - name.buf);
495         if (state->root.len)
496                 strbuf_insert(&name, 0, state->root.buf, state->root.len);
497         return squash_slash(strbuf_detach(&name, NULL));
498 }
499
500 static size_t sane_tz_len(const char *line, size_t len)
501 {
502         const char *tz, *p;
503
504         if (len < strlen(" +0500") || line[len-strlen(" +0500")] != ' ')
505                 return 0;
506         tz = line + len - strlen(" +0500");
507
508         if (tz[1] != '+' && tz[1] != '-')
509                 return 0;
510
511         for (p = tz + 2; p != line + len; p++)
512                 if (!isdigit(*p))
513                         return 0;
514
515         return line + len - tz;
516 }
517
518 static size_t tz_with_colon_len(const char *line, size_t len)
519 {
520         const char *tz, *p;
521
522         if (len < strlen(" +08:00") || line[len - strlen(":00")] != ':')
523                 return 0;
524         tz = line + len - strlen(" +08:00");
525
526         if (tz[0] != ' ' || (tz[1] != '+' && tz[1] != '-'))
527                 return 0;
528         p = tz + 2;
529         if (!isdigit(*p++) || !isdigit(*p++) || *p++ != ':' ||
530             !isdigit(*p++) || !isdigit(*p++))
531                 return 0;
532
533         return line + len - tz;
534 }
535
536 static size_t date_len(const char *line, size_t len)
537 {
538         const char *date, *p;
539
540         if (len < strlen("72-02-05") || line[len-strlen("-05")] != '-')
541                 return 0;
542         p = date = line + len - strlen("72-02-05");
543
544         if (!isdigit(*p++) || !isdigit(*p++) || *p++ != '-' ||
545             !isdigit(*p++) || !isdigit(*p++) || *p++ != '-' ||
546             !isdigit(*p++) || !isdigit(*p++))   /* Not a date. */
547                 return 0;
548
549         if (date - line >= strlen("19") &&
550             isdigit(date[-1]) && isdigit(date[-2]))     /* 4-digit year */
551                 date -= strlen("19");
552
553         return line + len - date;
554 }
555
556 static size_t short_time_len(const char *line, size_t len)
557 {
558         const char *time, *p;
559
560         if (len < strlen(" 07:01:32") || line[len-strlen(":32")] != ':')
561                 return 0;
562         p = time = line + len - strlen(" 07:01:32");
563
564         /* Permit 1-digit hours? */
565         if (*p++ != ' ' ||
566             !isdigit(*p++) || !isdigit(*p++) || *p++ != ':' ||
567             !isdigit(*p++) || !isdigit(*p++) || *p++ != ':' ||
568             !isdigit(*p++) || !isdigit(*p++))   /* Not a time. */
569                 return 0;
570
571         return line + len - time;
572 }
573
574 static size_t fractional_time_len(const char *line, size_t len)
575 {
576         const char *p;
577         size_t n;
578
579         /* Expected format: 19:41:17.620000023 */
580         if (!len || !isdigit(line[len - 1]))
581                 return 0;
582         p = line + len - 1;
583
584         /* Fractional seconds. */
585         while (p > line && isdigit(*p))
586                 p--;
587         if (*p != '.')
588                 return 0;
589
590         /* Hours, minutes, and whole seconds. */
591         n = short_time_len(line, p - line);
592         if (!n)
593                 return 0;
594
595         return line + len - p + n;
596 }
597
598 static size_t trailing_spaces_len(const char *line, size_t len)
599 {
600         const char *p;
601
602         /* Expected format: ' ' x (1 or more)  */
603         if (!len || line[len - 1] != ' ')
604                 return 0;
605
606         p = line + len;
607         while (p != line) {
608                 p--;
609                 if (*p != ' ')
610                         return line + len - (p + 1);
611         }
612
613         /* All spaces! */
614         return len;
615 }
616
617 static size_t diff_timestamp_len(const char *line, size_t len)
618 {
619         const char *end = line + len;
620         size_t n;
621
622         /*
623          * Posix: 2010-07-05 19:41:17
624          * GNU: 2010-07-05 19:41:17.620000023 -0500
625          */
626
627         if (!isdigit(end[-1]))
628                 return 0;
629
630         n = sane_tz_len(line, end - line);
631         if (!n)
632                 n = tz_with_colon_len(line, end - line);
633         end -= n;
634
635         n = short_time_len(line, end - line);
636         if (!n)
637                 n = fractional_time_len(line, end - line);
638         end -= n;
639
640         n = date_len(line, end - line);
641         if (!n) /* No date.  Too bad. */
642                 return 0;
643         end -= n;
644
645         if (end == line)        /* No space before date. */
646                 return 0;
647         if (end[-1] == '\t') {  /* Success! */
648                 end--;
649                 return line + len - end;
650         }
651         if (end[-1] != ' ')     /* No space before date. */
652                 return 0;
653
654         /* Whitespace damage. */
655         end -= trailing_spaces_len(line, end - line);
656         return line + len - end;
657 }
658
659 static char *find_name_common(struct apply_state *state,
660                               const char *line,
661                               const char *def,
662                               int p_value,
663                               const char *end,
664                               int terminate)
665 {
666         int len;
667         const char *start = NULL;
668
669         if (p_value == 0)
670                 start = line;
671         while (line != end) {
672                 char c = *line;
673
674                 if (!end && isspace(c)) {
675                         if (c == '\n')
676                                 break;
677                         if (name_terminate(c, terminate))
678                                 break;
679                 }
680                 line++;
681                 if (c == '/' && !--p_value)
682                         start = line;
683         }
684         if (!start)
685                 return squash_slash(xstrdup_or_null(def));
686         len = line - start;
687         if (!len)
688                 return squash_slash(xstrdup_or_null(def));
689
690         /*
691          * Generally we prefer the shorter name, especially
692          * if the other one is just a variation of that with
693          * something else tacked on to the end (ie "file.orig"
694          * or "file~").
695          */
696         if (def) {
697                 int deflen = strlen(def);
698                 if (deflen < len && !strncmp(start, def, deflen))
699                         return squash_slash(xstrdup(def));
700         }
701
702         if (state->root.len) {
703                 char *ret = xstrfmt("%s%.*s", state->root.buf, len, start);
704                 return squash_slash(ret);
705         }
706
707         return squash_slash(xmemdupz(start, len));
708 }
709
710 static char *find_name(struct apply_state *state,
711                        const char *line,
712                        char *def,
713                        int p_value,
714                        int terminate)
715 {
716         if (*line == '"') {
717                 char *name = find_name_gnu(state, line, def, p_value);
718                 if (name)
719                         return name;
720         }
721
722         return find_name_common(state, line, def, p_value, NULL, terminate);
723 }
724
725 static char *find_name_traditional(struct apply_state *state,
726                                    const char *line,
727                                    char *def,
728                                    int p_value)
729 {
730         size_t len;
731         size_t date_len;
732
733         if (*line == '"') {
734                 char *name = find_name_gnu(state, line, def, p_value);
735                 if (name)
736                         return name;
737         }
738
739         len = strchrnul(line, '\n') - line;
740         date_len = diff_timestamp_len(line, len);
741         if (!date_len)
742                 return find_name_common(state, line, def, p_value, NULL, TERM_TAB);
743         len -= date_len;
744
745         return find_name_common(state, line, def, p_value, line + len, 0);
746 }
747
748 /*
749  * Given the string after "--- " or "+++ ", guess the appropriate
750  * p_value for the given patch.
751  */
752 static int guess_p_value(struct apply_state *state, const char *nameline)
753 {
754         char *name, *cp;
755         int val = -1;
756
757         if (is_dev_null(nameline))
758                 return -1;
759         name = find_name_traditional(state, nameline, NULL, 0);
760         if (!name)
761                 return -1;
762         cp = strchr(name, '/');
763         if (!cp)
764                 val = 0;
765         else if (state->prefix) {
766                 /*
767                  * Does it begin with "a/$our-prefix" and such?  Then this is
768                  * very likely to apply to our directory.
769                  */
770                 if (starts_with(name, state->prefix))
771                         val = count_slashes(state->prefix);
772                 else {
773                         cp++;
774                         if (starts_with(cp, state->prefix))
775                                 val = count_slashes(state->prefix) + 1;
776                 }
777         }
778         free(name);
779         return val;
780 }
781
782 /*
783  * Does the ---/+++ line have the POSIX timestamp after the last HT?
784  * GNU diff puts epoch there to signal a creation/deletion event.  Is
785  * this such a timestamp?
786  */
787 static int has_epoch_timestamp(const char *nameline)
788 {
789         /*
790          * We are only interested in epoch timestamp; any non-zero
791          * fraction cannot be one, hence "(\.0+)?" in the regexp below.
792          * For the same reason, the date must be either 1969-12-31 or
793          * 1970-01-01, and the seconds part must be "00".
794          */
795         const char stamp_regexp[] =
796                 "^[0-2][0-9]:([0-5][0-9]):00(\\.0+)?"
797                 " "
798                 "([-+][0-2][0-9]:?[0-5][0-9])\n";
799         const char *timestamp = NULL, *cp, *colon;
800         static regex_t *stamp;
801         regmatch_t m[10];
802         int zoneoffset, epoch_hour, hour, minute;
803         int status;
804
805         for (cp = nameline; *cp != '\n'; cp++) {
806                 if (*cp == '\t')
807                         timestamp = cp + 1;
808         }
809         if (!timestamp)
810                 return 0;
811
812         /*
813          * YYYY-MM-DD hh:mm:ss must be from either 1969-12-31
814          * (west of GMT) or 1970-01-01 (east of GMT)
815          */
816         if (skip_prefix(timestamp, "1969-12-31 ", &timestamp))
817                 epoch_hour = 24;
818         else if (skip_prefix(timestamp, "1970-01-01 ", &timestamp))
819                 epoch_hour = 0;
820         else
821                 return 0;
822
823         if (!stamp) {
824                 stamp = xmalloc(sizeof(*stamp));
825                 if (regcomp(stamp, stamp_regexp, REG_EXTENDED)) {
826                         warning(_("Cannot prepare timestamp regexp %s"),
827                                 stamp_regexp);
828                         return 0;
829                 }
830         }
831
832         status = regexec(stamp, timestamp, ARRAY_SIZE(m), m, 0);
833         if (status) {
834                 if (status != REG_NOMATCH)
835                         warning(_("regexec returned %d for input: %s"),
836                                 status, timestamp);
837                 return 0;
838         }
839
840         hour = strtol(timestamp, NULL, 10);
841         minute = strtol(timestamp + m[1].rm_so, NULL, 10);
842
843         zoneoffset = strtol(timestamp + m[3].rm_so + 1, (char **) &colon, 10);
844         if (*colon == ':')
845                 zoneoffset = zoneoffset * 60 + strtol(colon + 1, NULL, 10);
846         else
847                 zoneoffset = (zoneoffset / 100) * 60 + (zoneoffset % 100);
848         if (timestamp[m[3].rm_so] == '-')
849                 zoneoffset = -zoneoffset;
850
851         return hour * 60 + minute - zoneoffset == epoch_hour * 60;
852 }
853
854 /*
855  * Get the name etc info from the ---/+++ lines of a traditional patch header
856  *
857  * FIXME! The end-of-filename heuristics are kind of screwy. For existing
858  * files, we can happily check the index for a match, but for creating a
859  * new file we should try to match whatever "patch" does. I have no idea.
860  */
861 static int parse_traditional_patch(struct apply_state *state,
862                                    const char *first,
863                                    const char *second,
864                                    struct patch *patch)
865 {
866         char *name;
867
868         first += 4;     /* skip "--- " */
869         second += 4;    /* skip "+++ " */
870         if (!state->p_value_known) {
871                 int p, q;
872                 p = guess_p_value(state, first);
873                 q = guess_p_value(state, second);
874                 if (p < 0) p = q;
875                 if (0 <= p && p == q) {
876                         state->p_value = p;
877                         state->p_value_known = 1;
878                 }
879         }
880         if (is_dev_null(first)) {
881                 patch->is_new = 1;
882                 patch->is_delete = 0;
883                 name = find_name_traditional(state, second, NULL, state->p_value);
884                 patch->new_name = name;
885         } else if (is_dev_null(second)) {
886                 patch->is_new = 0;
887                 patch->is_delete = 1;
888                 name = find_name_traditional(state, first, NULL, state->p_value);
889                 patch->old_name = name;
890         } else {
891                 char *first_name;
892                 first_name = find_name_traditional(state, first, NULL, state->p_value);
893                 name = find_name_traditional(state, second, first_name, state->p_value);
894                 free(first_name);
895                 if (has_epoch_timestamp(first)) {
896                         patch->is_new = 1;
897                         patch->is_delete = 0;
898                         patch->new_name = name;
899                 } else if (has_epoch_timestamp(second)) {
900                         patch->is_new = 0;
901                         patch->is_delete = 1;
902                         patch->old_name = name;
903                 } else {
904                         patch->old_name = name;
905                         patch->new_name = xstrdup_or_null(name);
906                 }
907         }
908         if (!name)
909                 return error(_("unable to find filename in patch at line %d"), state->linenr);
910
911         return 0;
912 }
913
914 static int gitdiff_hdrend(struct apply_state *state,
915                           const char *line,
916                           struct patch *patch)
917 {
918         return 1;
919 }
920
921 /*
922  * We're anal about diff header consistency, to make
923  * sure that we don't end up having strange ambiguous
924  * patches floating around.
925  *
926  * As a result, gitdiff_{old|new}name() will check
927  * their names against any previous information, just
928  * to make sure..
929  */
930 #define DIFF_OLD_NAME 0
931 #define DIFF_NEW_NAME 1
932
933 static int gitdiff_verify_name(struct apply_state *state,
934                                const char *line,
935                                int isnull,
936                                char **name,
937                                int side)
938 {
939         if (!*name && !isnull) {
940                 *name = find_name(state, line, NULL, state->p_value, TERM_TAB);
941                 return 0;
942         }
943
944         if (*name) {
945                 char *another;
946                 if (isnull)
947                         return error(_("git apply: bad git-diff - expected /dev/null, got %s on line %d"),
948                                      *name, state->linenr);
949                 another = find_name(state, line, NULL, state->p_value, TERM_TAB);
950                 if (!another || strcmp(another, *name)) {
951                         free(another);
952                         return error((side == DIFF_NEW_NAME) ?
953                             _("git apply: bad git-diff - inconsistent new filename on line %d") :
954                             _("git apply: bad git-diff - inconsistent old filename on line %d"), state->linenr);
955                 }
956                 free(another);
957         } else {
958                 if (!is_dev_null(line))
959                         return error(_("git apply: bad git-diff - expected /dev/null on line %d"), state->linenr);
960         }
961
962         return 0;
963 }
964
965 static int gitdiff_oldname(struct apply_state *state,
966                            const char *line,
967                            struct patch *patch)
968 {
969         return gitdiff_verify_name(state, line,
970                                    patch->is_new, &patch->old_name,
971                                    DIFF_OLD_NAME);
972 }
973
974 static int gitdiff_newname(struct apply_state *state,
975                            const char *line,
976                            struct patch *patch)
977 {
978         return gitdiff_verify_name(state, line,
979                                    patch->is_delete, &patch->new_name,
980                                    DIFF_NEW_NAME);
981 }
982
983 static int parse_mode_line(const char *line, int linenr, unsigned int *mode)
984 {
985         char *end;
986         *mode = strtoul(line, &end, 8);
987         if (end == line || !isspace(*end))
988                 return error(_("invalid mode on line %d: %s"), linenr, line);
989         return 0;
990 }
991
992 static int gitdiff_oldmode(struct apply_state *state,
993                            const char *line,
994                            struct patch *patch)
995 {
996         return parse_mode_line(line, state->linenr, &patch->old_mode);
997 }
998
999 static int gitdiff_newmode(struct apply_state *state,
1000                            const char *line,
1001                            struct patch *patch)
1002 {
1003         return parse_mode_line(line, state->linenr, &patch->new_mode);
1004 }
1005
1006 static int gitdiff_delete(struct apply_state *state,
1007                           const char *line,
1008                           struct patch *patch)
1009 {
1010         patch->is_delete = 1;
1011         free(patch->old_name);
1012         patch->old_name = xstrdup_or_null(patch->def_name);
1013         return gitdiff_oldmode(state, line, patch);
1014 }
1015
1016 static int gitdiff_newfile(struct apply_state *state,
1017                            const char *line,
1018                            struct patch *patch)
1019 {
1020         patch->is_new = 1;
1021         free(patch->new_name);
1022         patch->new_name = xstrdup_or_null(patch->def_name);
1023         return gitdiff_newmode(state, line, patch);
1024 }
1025
1026 static int gitdiff_copysrc(struct apply_state *state,
1027                            const char *line,
1028                            struct patch *patch)
1029 {
1030         patch->is_copy = 1;
1031         free(patch->old_name);
1032         patch->old_name = find_name(state, line, NULL, state->p_value ? state->p_value - 1 : 0, 0);
1033         return 0;
1034 }
1035
1036 static int gitdiff_copydst(struct apply_state *state,
1037                            const char *line,
1038                            struct patch *patch)
1039 {
1040         patch->is_copy = 1;
1041         free(patch->new_name);
1042         patch->new_name = find_name(state, line, NULL, state->p_value ? state->p_value - 1 : 0, 0);
1043         return 0;
1044 }
1045
1046 static int gitdiff_renamesrc(struct apply_state *state,
1047                              const char *line,
1048                              struct patch *patch)
1049 {
1050         patch->is_rename = 1;
1051         free(patch->old_name);
1052         patch->old_name = find_name(state, line, NULL, state->p_value ? state->p_value - 1 : 0, 0);
1053         return 0;
1054 }
1055
1056 static int gitdiff_renamedst(struct apply_state *state,
1057                              const char *line,
1058                              struct patch *patch)
1059 {
1060         patch->is_rename = 1;
1061         free(patch->new_name);
1062         patch->new_name = find_name(state, line, NULL, state->p_value ? state->p_value - 1 : 0, 0);
1063         return 0;
1064 }
1065
1066 static int gitdiff_similarity(struct apply_state *state,
1067                               const char *line,
1068                               struct patch *patch)
1069 {
1070         unsigned long val = strtoul(line, NULL, 10);
1071         if (val <= 100)
1072                 patch->score = val;
1073         return 0;
1074 }
1075
1076 static int gitdiff_dissimilarity(struct apply_state *state,
1077                                  const char *line,
1078                                  struct patch *patch)
1079 {
1080         unsigned long val = strtoul(line, NULL, 10);
1081         if (val <= 100)
1082                 patch->score = val;
1083         return 0;
1084 }
1085
1086 static int gitdiff_index(struct apply_state *state,
1087                          const char *line,
1088                          struct patch *patch)
1089 {
1090         /*
1091          * index line is N hexadecimal, "..", N hexadecimal,
1092          * and optional space with octal mode.
1093          */
1094         const char *ptr, *eol;
1095         int len;
1096         const unsigned hexsz = the_hash_algo->hexsz;
1097
1098         ptr = strchr(line, '.');
1099         if (!ptr || ptr[1] != '.' || hexsz < ptr - line)
1100                 return 0;
1101         len = ptr - line;
1102         memcpy(patch->old_oid_prefix, line, len);
1103         patch->old_oid_prefix[len] = 0;
1104
1105         line = ptr + 2;
1106         ptr = strchr(line, ' ');
1107         eol = strchrnul(line, '\n');
1108
1109         if (!ptr || eol < ptr)
1110                 ptr = eol;
1111         len = ptr - line;
1112
1113         if (hexsz < len)
1114                 return 0;
1115         memcpy(patch->new_oid_prefix, line, len);
1116         patch->new_oid_prefix[len] = 0;
1117         if (*ptr == ' ')
1118                 return gitdiff_oldmode(state, ptr + 1, patch);
1119         return 0;
1120 }
1121
1122 /*
1123  * This is normal for a diff that doesn't change anything: we'll fall through
1124  * into the next diff. Tell the parser to break out.
1125  */
1126 static int gitdiff_unrecognized(struct apply_state *state,
1127                                 const char *line,
1128                                 struct patch *patch)
1129 {
1130         return 1;
1131 }
1132
1133 /*
1134  * Skip p_value leading components from "line"; as we do not accept
1135  * absolute paths, return NULL in that case.
1136  */
1137 static const char *skip_tree_prefix(struct apply_state *state,
1138                                     const char *line,
1139                                     int llen)
1140 {
1141         int nslash;
1142         int i;
1143
1144         if (!state->p_value)
1145                 return (llen && line[0] == '/') ? NULL : line;
1146
1147         nslash = state->p_value;
1148         for (i = 0; i < llen; i++) {
1149                 int ch = line[i];
1150                 if (ch == '/' && --nslash <= 0)
1151                         return (i == 0) ? NULL : &line[i + 1];
1152         }
1153         return NULL;
1154 }
1155
1156 /*
1157  * This is to extract the same name that appears on "diff --git"
1158  * line.  We do not find and return anything if it is a rename
1159  * patch, and it is OK because we will find the name elsewhere.
1160  * We need to reliably find name only when it is mode-change only,
1161  * creation or deletion of an empty file.  In any of these cases,
1162  * both sides are the same name under a/ and b/ respectively.
1163  */
1164 static char *git_header_name(struct apply_state *state,
1165                              const char *line,
1166                              int llen)
1167 {
1168         const char *name;
1169         const char *second = NULL;
1170         size_t len, line_len;
1171
1172         line += strlen("diff --git ");
1173         llen -= strlen("diff --git ");
1174
1175         if (*line == '"') {
1176                 const char *cp;
1177                 struct strbuf first = STRBUF_INIT;
1178                 struct strbuf sp = STRBUF_INIT;
1179
1180                 if (unquote_c_style(&first, line, &second))
1181                         goto free_and_fail1;
1182
1183                 /* strip the a/b prefix including trailing slash */
1184                 cp = skip_tree_prefix(state, first.buf, first.len);
1185                 if (!cp)
1186                         goto free_and_fail1;
1187                 strbuf_remove(&first, 0, cp - first.buf);
1188
1189                 /*
1190                  * second points at one past closing dq of name.
1191                  * find the second name.
1192                  */
1193                 while ((second < line + llen) && isspace(*second))
1194                         second++;
1195
1196                 if (line + llen <= second)
1197                         goto free_and_fail1;
1198                 if (*second == '"') {
1199                         if (unquote_c_style(&sp, second, NULL))
1200                                 goto free_and_fail1;
1201                         cp = skip_tree_prefix(state, sp.buf, sp.len);
1202                         if (!cp)
1203                                 goto free_and_fail1;
1204                         /* They must match, otherwise ignore */
1205                         if (strcmp(cp, first.buf))
1206                                 goto free_and_fail1;
1207                         strbuf_release(&sp);
1208                         return strbuf_detach(&first, NULL);
1209                 }
1210
1211                 /* unquoted second */
1212                 cp = skip_tree_prefix(state, second, line + llen - second);
1213                 if (!cp)
1214                         goto free_and_fail1;
1215                 if (line + llen - cp != first.len ||
1216                     memcmp(first.buf, cp, first.len))
1217                         goto free_and_fail1;
1218                 return strbuf_detach(&first, NULL);
1219
1220         free_and_fail1:
1221                 strbuf_release(&first);
1222                 strbuf_release(&sp);
1223                 return NULL;
1224         }
1225
1226         /* unquoted first name */
1227         name = skip_tree_prefix(state, line, llen);
1228         if (!name)
1229                 return NULL;
1230
1231         /*
1232          * since the first name is unquoted, a dq if exists must be
1233          * the beginning of the second name.
1234          */
1235         for (second = name; second < line + llen; second++) {
1236                 if (*second == '"') {
1237                         struct strbuf sp = STRBUF_INIT;
1238                         const char *np;
1239
1240                         if (unquote_c_style(&sp, second, NULL))
1241                                 goto free_and_fail2;
1242
1243                         np = skip_tree_prefix(state, sp.buf, sp.len);
1244                         if (!np)
1245                                 goto free_and_fail2;
1246
1247                         len = sp.buf + sp.len - np;
1248                         if (len < second - name &&
1249                             !strncmp(np, name, len) &&
1250                             isspace(name[len])) {
1251                                 /* Good */
1252                                 strbuf_remove(&sp, 0, np - sp.buf);
1253                                 return strbuf_detach(&sp, NULL);
1254                         }
1255
1256                 free_and_fail2:
1257                         strbuf_release(&sp);
1258                         return NULL;
1259                 }
1260         }
1261
1262         /*
1263          * Accept a name only if it shows up twice, exactly the same
1264          * form.
1265          */
1266         second = strchr(name, '\n');
1267         if (!second)
1268                 return NULL;
1269         line_len = second - name;
1270         for (len = 0 ; ; len++) {
1271                 switch (name[len]) {
1272                 default:
1273                         continue;
1274                 case '\n':
1275                         return NULL;
1276                 case '\t': case ' ':
1277                         /*
1278                          * Is this the separator between the preimage
1279                          * and the postimage pathname?  Again, we are
1280                          * only interested in the case where there is
1281                          * no rename, as this is only to set def_name
1282                          * and a rename patch has the names elsewhere
1283                          * in an unambiguous form.
1284                          */
1285                         if (!name[len + 1])
1286                                 return NULL; /* no postimage name */
1287                         second = skip_tree_prefix(state, name + len + 1,
1288                                                   line_len - (len + 1));
1289                         if (!second)
1290                                 return NULL;
1291                         /*
1292                          * Does len bytes starting at "name" and "second"
1293                          * (that are separated by one HT or SP we just
1294                          * found) exactly match?
1295                          */
1296                         if (second[len] == '\n' && !strncmp(name, second, len))
1297                                 return xmemdupz(name, len);
1298                 }
1299         }
1300 }
1301
1302 static int check_header_line(struct apply_state *state, struct patch *patch)
1303 {
1304         int extensions = (patch->is_delete == 1) + (patch->is_new == 1) +
1305                          (patch->is_rename == 1) + (patch->is_copy == 1);
1306         if (extensions > 1)
1307                 return error(_("inconsistent header lines %d and %d"),
1308                              patch->extension_linenr, state->linenr);
1309         if (extensions && !patch->extension_linenr)
1310                 patch->extension_linenr = state->linenr;
1311         return 0;
1312 }
1313
1314 /* Verify that we recognize the lines following a git header */
1315 static int parse_git_header(struct apply_state *state,
1316                             const char *line,
1317                             int len,
1318                             unsigned int size,
1319                             struct patch *patch)
1320 {
1321         unsigned long offset;
1322
1323         /* A git diff has explicit new/delete information, so we don't guess */
1324         patch->is_new = 0;
1325         patch->is_delete = 0;
1326
1327         /*
1328          * Some things may not have the old name in the
1329          * rest of the headers anywhere (pure mode changes,
1330          * or removing or adding empty files), so we get
1331          * the default name from the header.
1332          */
1333         patch->def_name = git_header_name(state, line, len);
1334         if (patch->def_name && state->root.len) {
1335                 char *s = xstrfmt("%s%s", state->root.buf, patch->def_name);
1336                 free(patch->def_name);
1337                 patch->def_name = s;
1338         }
1339
1340         line += len;
1341         size -= len;
1342         state->linenr++;
1343         for (offset = len ; size > 0 ; offset += len, size -= len, line += len, state->linenr++) {
1344                 static const struct opentry {
1345                         const char *str;
1346                         int (*fn)(struct apply_state *, const char *, struct patch *);
1347                 } optable[] = {
1348                         { "@@ -", gitdiff_hdrend },
1349                         { "--- ", gitdiff_oldname },
1350                         { "+++ ", gitdiff_newname },
1351                         { "old mode ", gitdiff_oldmode },
1352                         { "new mode ", gitdiff_newmode },
1353                         { "deleted file mode ", gitdiff_delete },
1354                         { "new file mode ", gitdiff_newfile },
1355                         { "copy from ", gitdiff_copysrc },
1356                         { "copy to ", gitdiff_copydst },
1357                         { "rename old ", gitdiff_renamesrc },
1358                         { "rename new ", gitdiff_renamedst },
1359                         { "rename from ", gitdiff_renamesrc },
1360                         { "rename to ", gitdiff_renamedst },
1361                         { "similarity index ", gitdiff_similarity },
1362                         { "dissimilarity index ", gitdiff_dissimilarity },
1363                         { "index ", gitdiff_index },
1364                         { "", gitdiff_unrecognized },
1365                 };
1366                 int i;
1367
1368                 len = linelen(line, size);
1369                 if (!len || line[len-1] != '\n')
1370                         break;
1371                 for (i = 0; i < ARRAY_SIZE(optable); i++) {
1372                         const struct opentry *p = optable + i;
1373                         int oplen = strlen(p->str);
1374                         int res;
1375                         if (len < oplen || memcmp(p->str, line, oplen))
1376                                 continue;
1377                         res = p->fn(state, line + oplen, patch);
1378                         if (res < 0)
1379                                 return -1;
1380                         if (check_header_line(state, patch))
1381                                 return -1;
1382                         if (res > 0)
1383                                 return offset;
1384                         break;
1385                 }
1386         }
1387
1388         return offset;
1389 }
1390
1391 static int parse_num(const char *line, unsigned long *p)
1392 {
1393         char *ptr;
1394
1395         if (!isdigit(*line))
1396                 return 0;
1397         *p = strtoul(line, &ptr, 10);
1398         return ptr - line;
1399 }
1400
1401 static int parse_range(const char *line, int len, int offset, const char *expect,
1402                        unsigned long *p1, unsigned long *p2)
1403 {
1404         int digits, ex;
1405
1406         if (offset < 0 || offset >= len)
1407                 return -1;
1408         line += offset;
1409         len -= offset;
1410
1411         digits = parse_num(line, p1);
1412         if (!digits)
1413                 return -1;
1414
1415         offset += digits;
1416         line += digits;
1417         len -= digits;
1418
1419         *p2 = 1;
1420         if (*line == ',') {
1421                 digits = parse_num(line+1, p2);
1422                 if (!digits)
1423                         return -1;
1424
1425                 offset += digits+1;
1426                 line += digits+1;
1427                 len -= digits+1;
1428         }
1429
1430         ex = strlen(expect);
1431         if (ex > len)
1432                 return -1;
1433         if (memcmp(line, expect, ex))
1434                 return -1;
1435
1436         return offset + ex;
1437 }
1438
1439 static void recount_diff(const char *line, int size, struct fragment *fragment)
1440 {
1441         int oldlines = 0, newlines = 0, ret = 0;
1442
1443         if (size < 1) {
1444                 warning("recount: ignore empty hunk");
1445                 return;
1446         }
1447
1448         for (;;) {
1449                 int len = linelen(line, size);
1450                 size -= len;
1451                 line += len;
1452
1453                 if (size < 1)
1454                         break;
1455
1456                 switch (*line) {
1457                 case ' ': case '\n':
1458                         newlines++;
1459                         /* fall through */
1460                 case '-':
1461                         oldlines++;
1462                         continue;
1463                 case '+':
1464                         newlines++;
1465                         continue;
1466                 case '\\':
1467                         continue;
1468                 case '@':
1469                         ret = size < 3 || !starts_with(line, "@@ ");
1470                         break;
1471                 case 'd':
1472                         ret = size < 5 || !starts_with(line, "diff ");
1473                         break;
1474                 default:
1475                         ret = -1;
1476                         break;
1477                 }
1478                 if (ret) {
1479                         warning(_("recount: unexpected line: %.*s"),
1480                                 (int)linelen(line, size), line);
1481                         return;
1482                 }
1483                 break;
1484         }
1485         fragment->oldlines = oldlines;
1486         fragment->newlines = newlines;
1487 }
1488
1489 /*
1490  * Parse a unified diff fragment header of the
1491  * form "@@ -a,b +c,d @@"
1492  */
1493 static int parse_fragment_header(const char *line, int len, struct fragment *fragment)
1494 {
1495         int offset;
1496
1497         if (!len || line[len-1] != '\n')
1498                 return -1;
1499
1500         /* Figure out the number of lines in a fragment */
1501         offset = parse_range(line, len, 4, " +", &fragment->oldpos, &fragment->oldlines);
1502         offset = parse_range(line, len, offset, " @@", &fragment->newpos, &fragment->newlines);
1503
1504         return offset;
1505 }
1506
1507 /*
1508  * Find file diff header
1509  *
1510  * Returns:
1511  *  -1 if no header was found
1512  *  -128 in case of error
1513  *   the size of the header in bytes (called "offset") otherwise
1514  */
1515 static int find_header(struct apply_state *state,
1516                        const char *line,
1517                        unsigned long size,
1518                        int *hdrsize,
1519                        struct patch *patch)
1520 {
1521         unsigned long offset, len;
1522
1523         patch->is_toplevel_relative = 0;
1524         patch->is_rename = patch->is_copy = 0;
1525         patch->is_new = patch->is_delete = -1;
1526         patch->old_mode = patch->new_mode = 0;
1527         patch->old_name = patch->new_name = NULL;
1528         for (offset = 0; size > 0; offset += len, size -= len, line += len, state->linenr++) {
1529                 unsigned long nextlen;
1530
1531                 len = linelen(line, size);
1532                 if (!len)
1533                         break;
1534
1535                 /* Testing this early allows us to take a few shortcuts.. */
1536                 if (len < 6)
1537                         continue;
1538
1539                 /*
1540                  * Make sure we don't find any unconnected patch fragments.
1541                  * That's a sign that we didn't find a header, and that a
1542                  * patch has become corrupted/broken up.
1543                  */
1544                 if (!memcmp("@@ -", line, 4)) {
1545                         struct fragment dummy;
1546                         if (parse_fragment_header(line, len, &dummy) < 0)
1547                                 continue;
1548                         error(_("patch fragment without header at line %d: %.*s"),
1549                                      state->linenr, (int)len-1, line);
1550                         return -128;
1551                 }
1552
1553                 if (size < len + 6)
1554                         break;
1555
1556                 /*
1557                  * Git patch? It might not have a real patch, just a rename
1558                  * or mode change, so we handle that specially
1559                  */
1560                 if (!memcmp("diff --git ", line, 11)) {
1561                         int git_hdr_len = parse_git_header(state, line, len, size, patch);
1562                         if (git_hdr_len < 0)
1563                                 return -128;
1564                         if (git_hdr_len <= len)
1565                                 continue;
1566                         if (!patch->old_name && !patch->new_name) {
1567                                 if (!patch->def_name) {
1568                                         error(Q_("git diff header lacks filename information when removing "
1569                                                         "%d leading pathname component (line %d)",
1570                                                         "git diff header lacks filename information when removing "
1571                                                         "%d leading pathname components (line %d)",
1572                                                         state->p_value),
1573                                                      state->p_value, state->linenr);
1574                                         return -128;
1575                                 }
1576                                 patch->old_name = xstrdup(patch->def_name);
1577                                 patch->new_name = xstrdup(patch->def_name);
1578                         }
1579                         if ((!patch->new_name && !patch->is_delete) ||
1580                             (!patch->old_name && !patch->is_new)) {
1581                                 error(_("git diff header lacks filename information "
1582                                              "(line %d)"), state->linenr);
1583                                 return -128;
1584                         }
1585                         patch->is_toplevel_relative = 1;
1586                         *hdrsize = git_hdr_len;
1587                         return offset;
1588                 }
1589
1590                 /* --- followed by +++ ? */
1591                 if (memcmp("--- ", line,  4) || memcmp("+++ ", line + len, 4))
1592                         continue;
1593
1594                 /*
1595                  * We only accept unified patches, so we want it to
1596                  * at least have "@@ -a,b +c,d @@\n", which is 14 chars
1597                  * minimum ("@@ -0,0 +1 @@\n" is the shortest).
1598                  */
1599                 nextlen = linelen(line + len, size - len);
1600                 if (size < nextlen + 14 || memcmp("@@ -", line + len + nextlen, 4))
1601                         continue;
1602
1603                 /* Ok, we'll consider it a patch */
1604                 if (parse_traditional_patch(state, line, line+len, patch))
1605                         return -128;
1606                 *hdrsize = len + nextlen;
1607                 state->linenr += 2;
1608                 return offset;
1609         }
1610         return -1;
1611 }
1612
1613 static void record_ws_error(struct apply_state *state,
1614                             unsigned result,
1615                             const char *line,
1616                             int len,
1617                             int linenr)
1618 {
1619         char *err;
1620
1621         if (!result)
1622                 return;
1623
1624         state->whitespace_error++;
1625         if (state->squelch_whitespace_errors &&
1626             state->squelch_whitespace_errors < state->whitespace_error)
1627                 return;
1628
1629         err = whitespace_error_string(result);
1630         if (state->apply_verbosity > verbosity_silent)
1631                 fprintf(stderr, "%s:%d: %s.\n%.*s\n",
1632                         state->patch_input_file, linenr, err, len, line);
1633         free(err);
1634 }
1635
1636 static void check_whitespace(struct apply_state *state,
1637                              const char *line,
1638                              int len,
1639                              unsigned ws_rule)
1640 {
1641         unsigned result = ws_check(line + 1, len - 1, ws_rule);
1642
1643         record_ws_error(state, result, line + 1, len - 2, state->linenr);
1644 }
1645
1646 /*
1647  * Check if the patch has context lines with CRLF or
1648  * the patch wants to remove lines with CRLF.
1649  */
1650 static void check_old_for_crlf(struct patch *patch, const char *line, int len)
1651 {
1652         if (len >= 2 && line[len-1] == '\n' && line[len-2] == '\r') {
1653                 patch->ws_rule |= WS_CR_AT_EOL;
1654                 patch->crlf_in_old = 1;
1655         }
1656 }
1657
1658
1659 /*
1660  * Parse a unified diff. Note that this really needs to parse each
1661  * fragment separately, since the only way to know the difference
1662  * between a "---" that is part of a patch, and a "---" that starts
1663  * the next patch is to look at the line counts..
1664  */
1665 static int parse_fragment(struct apply_state *state,
1666                           const char *line,
1667                           unsigned long size,
1668                           struct patch *patch,
1669                           struct fragment *fragment)
1670 {
1671         int added, deleted;
1672         int len = linelen(line, size), offset;
1673         unsigned long oldlines, newlines;
1674         unsigned long leading, trailing;
1675
1676         offset = parse_fragment_header(line, len, fragment);
1677         if (offset < 0)
1678                 return -1;
1679         if (offset > 0 && patch->recount)
1680                 recount_diff(line + offset, size - offset, fragment);
1681         oldlines = fragment->oldlines;
1682         newlines = fragment->newlines;
1683         leading = 0;
1684         trailing = 0;
1685
1686         /* Parse the thing.. */
1687         line += len;
1688         size -= len;
1689         state->linenr++;
1690         added = deleted = 0;
1691         for (offset = len;
1692              0 < size;
1693              offset += len, size -= len, line += len, state->linenr++) {
1694                 if (!oldlines && !newlines)
1695                         break;
1696                 len = linelen(line, size);
1697                 if (!len || line[len-1] != '\n')
1698                         return -1;
1699                 switch (*line) {
1700                 default:
1701                         return -1;
1702                 case '\n': /* newer GNU diff, an empty context line */
1703                 case ' ':
1704                         oldlines--;
1705                         newlines--;
1706                         if (!deleted && !added)
1707                                 leading++;
1708                         trailing++;
1709                         check_old_for_crlf(patch, line, len);
1710                         if (!state->apply_in_reverse &&
1711                             state->ws_error_action == correct_ws_error)
1712                                 check_whitespace(state, line, len, patch->ws_rule);
1713                         break;
1714                 case '-':
1715                         if (!state->apply_in_reverse)
1716                                 check_old_for_crlf(patch, line, len);
1717                         if (state->apply_in_reverse &&
1718                             state->ws_error_action != nowarn_ws_error)
1719                                 check_whitespace(state, line, len, patch->ws_rule);
1720                         deleted++;
1721                         oldlines--;
1722                         trailing = 0;
1723                         break;
1724                 case '+':
1725                         if (state->apply_in_reverse)
1726                                 check_old_for_crlf(patch, line, len);
1727                         if (!state->apply_in_reverse &&
1728                             state->ws_error_action != nowarn_ws_error)
1729                                 check_whitespace(state, line, len, patch->ws_rule);
1730                         added++;
1731                         newlines--;
1732                         trailing = 0;
1733                         break;
1734
1735                 /*
1736                  * We allow "\ No newline at end of file". Depending
1737                  * on locale settings when the patch was produced we
1738                  * don't know what this line looks like. The only
1739                  * thing we do know is that it begins with "\ ".
1740                  * Checking for 12 is just for sanity check -- any
1741                  * l10n of "\ No newline..." is at least that long.
1742                  */
1743                 case '\\':
1744                         if (len < 12 || memcmp(line, "\\ ", 2))
1745                                 return -1;
1746                         break;
1747                 }
1748         }
1749         if (oldlines || newlines)
1750                 return -1;
1751         if (!patch->recount && !deleted && !added)
1752                 return -1;
1753
1754         fragment->leading = leading;
1755         fragment->trailing = trailing;
1756
1757         /*
1758          * If a fragment ends with an incomplete line, we failed to include
1759          * it in the above loop because we hit oldlines == newlines == 0
1760          * before seeing it.
1761          */
1762         if (12 < size && !memcmp(line, "\\ ", 2))
1763                 offset += linelen(line, size);
1764
1765         patch->lines_added += added;
1766         patch->lines_deleted += deleted;
1767
1768         if (0 < patch->is_new && oldlines)
1769                 return error(_("new file depends on old contents"));
1770         if (0 < patch->is_delete && newlines)
1771                 return error(_("deleted file still has contents"));
1772         return offset;
1773 }
1774
1775 /*
1776  * We have seen "diff --git a/... b/..." header (or a traditional patch
1777  * header).  Read hunks that belong to this patch into fragments and hang
1778  * them to the given patch structure.
1779  *
1780  * The (fragment->patch, fragment->size) pair points into the memory given
1781  * by the caller, not a copy, when we return.
1782  *
1783  * Returns:
1784  *   -1 in case of error,
1785  *   the number of bytes in the patch otherwise.
1786  */
1787 static int parse_single_patch(struct apply_state *state,
1788                               const char *line,
1789                               unsigned long size,
1790                               struct patch *patch)
1791 {
1792         unsigned long offset = 0;
1793         unsigned long oldlines = 0, newlines = 0, context = 0;
1794         struct fragment **fragp = &patch->fragments;
1795
1796         while (size > 4 && !memcmp(line, "@@ -", 4)) {
1797                 struct fragment *fragment;
1798                 int len;
1799
1800                 fragment = xcalloc(1, sizeof(*fragment));
1801                 fragment->linenr = state->linenr;
1802                 len = parse_fragment(state, line, size, patch, fragment);
1803                 if (len <= 0) {
1804                         free(fragment);
1805                         return error(_("corrupt patch at line %d"), state->linenr);
1806                 }
1807                 fragment->patch = line;
1808                 fragment->size = len;
1809                 oldlines += fragment->oldlines;
1810                 newlines += fragment->newlines;
1811                 context += fragment->leading + fragment->trailing;
1812
1813                 *fragp = fragment;
1814                 fragp = &fragment->next;
1815
1816                 offset += len;
1817                 line += len;
1818                 size -= len;
1819         }
1820
1821         /*
1822          * If something was removed (i.e. we have old-lines) it cannot
1823          * be creation, and if something was added it cannot be
1824          * deletion.  However, the reverse is not true; --unified=0
1825          * patches that only add are not necessarily creation even
1826          * though they do not have any old lines, and ones that only
1827          * delete are not necessarily deletion.
1828          *
1829          * Unfortunately, a real creation/deletion patch do _not_ have
1830          * any context line by definition, so we cannot safely tell it
1831          * apart with --unified=0 insanity.  At least if the patch has
1832          * more than one hunk it is not creation or deletion.
1833          */
1834         if (patch->is_new < 0 &&
1835             (oldlines || (patch->fragments && patch->fragments->next)))
1836                 patch->is_new = 0;
1837         if (patch->is_delete < 0 &&
1838             (newlines || (patch->fragments && patch->fragments->next)))
1839                 patch->is_delete = 0;
1840
1841         if (0 < patch->is_new && oldlines)
1842                 return error(_("new file %s depends on old contents"), patch->new_name);
1843         if (0 < patch->is_delete && newlines)
1844                 return error(_("deleted file %s still has contents"), patch->old_name);
1845         if (!patch->is_delete && !newlines && context && state->apply_verbosity > verbosity_silent)
1846                 fprintf_ln(stderr,
1847                            _("** warning: "
1848                              "file %s becomes empty but is not deleted"),
1849                            patch->new_name);
1850
1851         return offset;
1852 }
1853
1854 static inline int metadata_changes(struct patch *patch)
1855 {
1856         return  patch->is_rename > 0 ||
1857                 patch->is_copy > 0 ||
1858                 patch->is_new > 0 ||
1859                 patch->is_delete ||
1860                 (patch->old_mode && patch->new_mode &&
1861                  patch->old_mode != patch->new_mode);
1862 }
1863
1864 static char *inflate_it(const void *data, unsigned long size,
1865                         unsigned long inflated_size)
1866 {
1867         git_zstream stream;
1868         void *out;
1869         int st;
1870
1871         memset(&stream, 0, sizeof(stream));
1872
1873         stream.next_in = (unsigned char *)data;
1874         stream.avail_in = size;
1875         stream.next_out = out = xmalloc(inflated_size);
1876         stream.avail_out = inflated_size;
1877         git_inflate_init(&stream);
1878         st = git_inflate(&stream, Z_FINISH);
1879         git_inflate_end(&stream);
1880         if ((st != Z_STREAM_END) || stream.total_out != inflated_size) {
1881                 free(out);
1882                 return NULL;
1883         }
1884         return out;
1885 }
1886
1887 /*
1888  * Read a binary hunk and return a new fragment; fragment->patch
1889  * points at an allocated memory that the caller must free, so
1890  * it is marked as "->free_patch = 1".
1891  */
1892 static struct fragment *parse_binary_hunk(struct apply_state *state,
1893                                           char **buf_p,
1894                                           unsigned long *sz_p,
1895                                           int *status_p,
1896                                           int *used_p)
1897 {
1898         /*
1899          * Expect a line that begins with binary patch method ("literal"
1900          * or "delta"), followed by the length of data before deflating.
1901          * a sequence of 'length-byte' followed by base-85 encoded data
1902          * should follow, terminated by a newline.
1903          *
1904          * Each 5-byte sequence of base-85 encodes up to 4 bytes,
1905          * and we would limit the patch line to 66 characters,
1906          * so one line can fit up to 13 groups that would decode
1907          * to 52 bytes max.  The length byte 'A'-'Z' corresponds
1908          * to 1-26 bytes, and 'a'-'z' corresponds to 27-52 bytes.
1909          */
1910         int llen, used;
1911         unsigned long size = *sz_p;
1912         char *buffer = *buf_p;
1913         int patch_method;
1914         unsigned long origlen;
1915         char *data = NULL;
1916         int hunk_size = 0;
1917         struct fragment *frag;
1918
1919         llen = linelen(buffer, size);
1920         used = llen;
1921
1922         *status_p = 0;
1923
1924         if (starts_with(buffer, "delta ")) {
1925                 patch_method = BINARY_DELTA_DEFLATED;
1926                 origlen = strtoul(buffer + 6, NULL, 10);
1927         }
1928         else if (starts_with(buffer, "literal ")) {
1929                 patch_method = BINARY_LITERAL_DEFLATED;
1930                 origlen = strtoul(buffer + 8, NULL, 10);
1931         }
1932         else
1933                 return NULL;
1934
1935         state->linenr++;
1936         buffer += llen;
1937         while (1) {
1938                 int byte_length, max_byte_length, newsize;
1939                 llen = linelen(buffer, size);
1940                 used += llen;
1941                 state->linenr++;
1942                 if (llen == 1) {
1943                         /* consume the blank line */
1944                         buffer++;
1945                         size--;
1946                         break;
1947                 }
1948                 /*
1949                  * Minimum line is "A00000\n" which is 7-byte long,
1950                  * and the line length must be multiple of 5 plus 2.
1951                  */
1952                 if ((llen < 7) || (llen-2) % 5)
1953                         goto corrupt;
1954                 max_byte_length = (llen - 2) / 5 * 4;
1955                 byte_length = *buffer;
1956                 if ('A' <= byte_length && byte_length <= 'Z')
1957                         byte_length = byte_length - 'A' + 1;
1958                 else if ('a' <= byte_length && byte_length <= 'z')
1959                         byte_length = byte_length - 'a' + 27;
1960                 else
1961                         goto corrupt;
1962                 /* if the input length was not multiple of 4, we would
1963                  * have filler at the end but the filler should never
1964                  * exceed 3 bytes
1965                  */
1966                 if (max_byte_length < byte_length ||
1967                     byte_length <= max_byte_length - 4)
1968                         goto corrupt;
1969                 newsize = hunk_size + byte_length;
1970                 data = xrealloc(data, newsize);
1971                 if (decode_85(data + hunk_size, buffer + 1, byte_length))
1972                         goto corrupt;
1973                 hunk_size = newsize;
1974                 buffer += llen;
1975                 size -= llen;
1976         }
1977
1978         frag = xcalloc(1, sizeof(*frag));
1979         frag->patch = inflate_it(data, hunk_size, origlen);
1980         frag->free_patch = 1;
1981         if (!frag->patch)
1982                 goto corrupt;
1983         free(data);
1984         frag->size = origlen;
1985         *buf_p = buffer;
1986         *sz_p = size;
1987         *used_p = used;
1988         frag->binary_patch_method = patch_method;
1989         return frag;
1990
1991  corrupt:
1992         free(data);
1993         *status_p = -1;
1994         error(_("corrupt binary patch at line %d: %.*s"),
1995               state->linenr-1, llen-1, buffer);
1996         return NULL;
1997 }
1998
1999 /*
2000  * Returns:
2001  *   -1 in case of error,
2002  *   the length of the parsed binary patch otherwise
2003  */
2004 static int parse_binary(struct apply_state *state,
2005                         char *buffer,
2006                         unsigned long size,
2007                         struct patch *patch)
2008 {
2009         /*
2010          * We have read "GIT binary patch\n"; what follows is a line
2011          * that says the patch method (currently, either "literal" or
2012          * "delta") and the length of data before deflating; a
2013          * sequence of 'length-byte' followed by base-85 encoded data
2014          * follows.
2015          *
2016          * When a binary patch is reversible, there is another binary
2017          * hunk in the same format, starting with patch method (either
2018          * "literal" or "delta") with the length of data, and a sequence
2019          * of length-byte + base-85 encoded data, terminated with another
2020          * empty line.  This data, when applied to the postimage, produces
2021          * the preimage.
2022          */
2023         struct fragment *forward;
2024         struct fragment *reverse;
2025         int status;
2026         int used, used_1;
2027
2028         forward = parse_binary_hunk(state, &buffer, &size, &status, &used);
2029         if (!forward && !status)
2030                 /* there has to be one hunk (forward hunk) */
2031                 return error(_("unrecognized binary patch at line %d"), state->linenr-1);
2032         if (status)
2033                 /* otherwise we already gave an error message */
2034                 return status;
2035
2036         reverse = parse_binary_hunk(state, &buffer, &size, &status, &used_1);
2037         if (reverse)
2038                 used += used_1;
2039         else if (status) {
2040                 /*
2041                  * Not having reverse hunk is not an error, but having
2042                  * a corrupt reverse hunk is.
2043                  */
2044                 free((void*) forward->patch);
2045                 free(forward);
2046                 return status;
2047         }
2048         forward->next = reverse;
2049         patch->fragments = forward;
2050         patch->is_binary = 1;
2051         return used;
2052 }
2053
2054 static void prefix_one(struct apply_state *state, char **name)
2055 {
2056         char *old_name = *name;
2057         if (!old_name)
2058                 return;
2059         *name = prefix_filename(state->prefix, *name);
2060         free(old_name);
2061 }
2062
2063 static void prefix_patch(struct apply_state *state, struct patch *p)
2064 {
2065         if (!state->prefix || p->is_toplevel_relative)
2066                 return;
2067         prefix_one(state, &p->new_name);
2068         prefix_one(state, &p->old_name);
2069 }
2070
2071 /*
2072  * include/exclude
2073  */
2074
2075 static void add_name_limit(struct apply_state *state,
2076                            const char *name,
2077                            int exclude)
2078 {
2079         struct string_list_item *it;
2080
2081         it = string_list_append(&state->limit_by_name, name);
2082         it->util = exclude ? NULL : (void *) 1;
2083 }
2084
2085 static int use_patch(struct apply_state *state, struct patch *p)
2086 {
2087         const char *pathname = p->new_name ? p->new_name : p->old_name;
2088         int i;
2089
2090         /* Paths outside are not touched regardless of "--include" */
2091         if (state->prefix && *state->prefix) {
2092                 const char *rest;
2093                 if (!skip_prefix(pathname, state->prefix, &rest) || !*rest)
2094                         return 0;
2095         }
2096
2097         /* See if it matches any of exclude/include rule */
2098         for (i = 0; i < state->limit_by_name.nr; i++) {
2099                 struct string_list_item *it = &state->limit_by_name.items[i];
2100                 if (!wildmatch(it->string, pathname, 0))
2101                         return (it->util != NULL);
2102         }
2103
2104         /*
2105          * If we had any include, a path that does not match any rule is
2106          * not used.  Otherwise, we saw bunch of exclude rules (or none)
2107          * and such a path is used.
2108          */
2109         return !state->has_include;
2110 }
2111
2112 /*
2113  * Read the patch text in "buffer" that extends for "size" bytes; stop
2114  * reading after seeing a single patch (i.e. changes to a single file).
2115  * Create fragments (i.e. patch hunks) and hang them to the given patch.
2116  *
2117  * Returns:
2118  *   -1 if no header was found or parse_binary() failed,
2119  *   -128 on another error,
2120  *   the number of bytes consumed otherwise,
2121  *     so that the caller can call us again for the next patch.
2122  */
2123 static int parse_chunk(struct apply_state *state, char *buffer, unsigned long size, struct patch *patch)
2124 {
2125         int hdrsize, patchsize;
2126         int offset = find_header(state, buffer, size, &hdrsize, patch);
2127
2128         if (offset < 0)
2129                 return offset;
2130
2131         prefix_patch(state, patch);
2132
2133         if (!use_patch(state, patch))
2134                 patch->ws_rule = 0;
2135         else if (patch->new_name)
2136                 patch->ws_rule = whitespace_rule(state->repo->index,
2137                                                  patch->new_name);
2138         else
2139                 patch->ws_rule = whitespace_rule(state->repo->index,
2140                                                  patch->old_name);
2141
2142         patchsize = parse_single_patch(state,
2143                                        buffer + offset + hdrsize,
2144                                        size - offset - hdrsize,
2145                                        patch);
2146
2147         if (patchsize < 0)
2148                 return -128;
2149
2150         if (!patchsize) {
2151                 static const char git_binary[] = "GIT binary patch\n";
2152                 int hd = hdrsize + offset;
2153                 unsigned long llen = linelen(buffer + hd, size - hd);
2154
2155                 if (llen == sizeof(git_binary) - 1 &&
2156                     !memcmp(git_binary, buffer + hd, llen)) {
2157                         int used;
2158                         state->linenr++;
2159                         used = parse_binary(state, buffer + hd + llen,
2160                                             size - hd - llen, patch);
2161                         if (used < 0)
2162                                 return -1;
2163                         if (used)
2164                                 patchsize = used + llen;
2165                         else
2166                                 patchsize = 0;
2167                 }
2168                 else if (!memcmp(" differ\n", buffer + hd + llen - 8, 8)) {
2169                         static const char *binhdr[] = {
2170                                 "Binary files ",
2171                                 "Files ",
2172                                 NULL,
2173                         };
2174                         int i;
2175                         for (i = 0; binhdr[i]; i++) {
2176                                 int len = strlen(binhdr[i]);
2177                                 if (len < size - hd &&
2178                                     !memcmp(binhdr[i], buffer + hd, len)) {
2179                                         state->linenr++;
2180                                         patch->is_binary = 1;
2181                                         patchsize = llen;
2182                                         break;
2183                                 }
2184                         }
2185                 }
2186
2187                 /* Empty patch cannot be applied if it is a text patch
2188                  * without metadata change.  A binary patch appears
2189                  * empty to us here.
2190                  */
2191                 if ((state->apply || state->check) &&
2192                     (!patch->is_binary && !metadata_changes(patch))) {
2193                         error(_("patch with only garbage at line %d"), state->linenr);
2194                         return -128;
2195                 }
2196         }
2197
2198         return offset + hdrsize + patchsize;
2199 }
2200
2201 static void reverse_patches(struct patch *p)
2202 {
2203         for (; p; p = p->next) {
2204                 struct fragment *frag = p->fragments;
2205
2206                 SWAP(p->new_name, p->old_name);
2207                 SWAP(p->new_mode, p->old_mode);
2208                 SWAP(p->is_new, p->is_delete);
2209                 SWAP(p->lines_added, p->lines_deleted);
2210                 SWAP(p->old_oid_prefix, p->new_oid_prefix);
2211
2212                 for (; frag; frag = frag->next) {
2213                         SWAP(frag->newpos, frag->oldpos);
2214                         SWAP(frag->newlines, frag->oldlines);
2215                 }
2216         }
2217 }
2218
2219 static const char pluses[] =
2220 "++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++";
2221 static const char minuses[]=
2222 "----------------------------------------------------------------------";
2223
2224 static void show_stats(struct apply_state *state, struct patch *patch)
2225 {
2226         struct strbuf qname = STRBUF_INIT;
2227         char *cp = patch->new_name ? patch->new_name : patch->old_name;
2228         int max, add, del;
2229
2230         quote_c_style(cp, &qname, NULL, 0);
2231
2232         /*
2233          * "scale" the filename
2234          */
2235         max = state->max_len;
2236         if (max > 50)
2237                 max = 50;
2238
2239         if (qname.len > max) {
2240                 cp = strchr(qname.buf + qname.len + 3 - max, '/');
2241                 if (!cp)
2242                         cp = qname.buf + qname.len + 3 - max;
2243                 strbuf_splice(&qname, 0, cp - qname.buf, "...", 3);
2244         }
2245
2246         if (patch->is_binary) {
2247                 printf(" %-*s |  Bin\n", max, qname.buf);
2248                 strbuf_release(&qname);
2249                 return;
2250         }
2251
2252         printf(" %-*s |", max, qname.buf);
2253         strbuf_release(&qname);
2254
2255         /*
2256          * scale the add/delete
2257          */
2258         max = max + state->max_change > 70 ? 70 - max : state->max_change;
2259         add = patch->lines_added;
2260         del = patch->lines_deleted;
2261
2262         if (state->max_change > 0) {
2263                 int total = ((add + del) * max + state->max_change / 2) / state->max_change;
2264                 add = (add * max + state->max_change / 2) / state->max_change;
2265                 del = total - add;
2266         }
2267         printf("%5d %.*s%.*s\n", patch->lines_added + patch->lines_deleted,
2268                 add, pluses, del, minuses);
2269 }
2270
2271 static int read_old_data(struct stat *st, struct patch *patch,
2272                          const char *path, struct strbuf *buf)
2273 {
2274         int conv_flags = patch->crlf_in_old ?
2275                 CONV_EOL_KEEP_CRLF : CONV_EOL_RENORMALIZE;
2276         switch (st->st_mode & S_IFMT) {
2277         case S_IFLNK:
2278                 if (strbuf_readlink(buf, path, st->st_size) < 0)
2279                         return error(_("unable to read symlink %s"), path);
2280                 return 0;
2281         case S_IFREG:
2282                 if (strbuf_read_file(buf, path, st->st_size) != st->st_size)
2283                         return error(_("unable to open or read %s"), path);
2284                 /*
2285                  * "git apply" without "--index/--cached" should never look
2286                  * at the index; the target file may not have been added to
2287                  * the index yet, and we may not even be in any Git repository.
2288                  * Pass NULL to convert_to_git() to stress this; the function
2289                  * should never look at the index when explicit crlf option
2290                  * is given.
2291                  */
2292                 convert_to_git(NULL, path, buf->buf, buf->len, buf, conv_flags);
2293                 return 0;
2294         default:
2295                 return -1;
2296         }
2297 }
2298
2299 /*
2300  * Update the preimage, and the common lines in postimage,
2301  * from buffer buf of length len. If postlen is 0 the postimage
2302  * is updated in place, otherwise it's updated on a new buffer
2303  * of length postlen
2304  */
2305
2306 static void update_pre_post_images(struct image *preimage,
2307                                    struct image *postimage,
2308                                    char *buf,
2309                                    size_t len, size_t postlen)
2310 {
2311         int i, ctx, reduced;
2312         char *new_buf, *old_buf, *fixed;
2313         struct image fixed_preimage;
2314
2315         /*
2316          * Update the preimage with whitespace fixes.  Note that we
2317          * are not losing preimage->buf -- apply_one_fragment() will
2318          * free "oldlines".
2319          */
2320         prepare_image(&fixed_preimage, buf, len, 1);
2321         assert(postlen
2322                ? fixed_preimage.nr == preimage->nr
2323                : fixed_preimage.nr <= preimage->nr);
2324         for (i = 0; i < fixed_preimage.nr; i++)
2325                 fixed_preimage.line[i].flag = preimage->line[i].flag;
2326         free(preimage->line_allocated);
2327         *preimage = fixed_preimage;
2328
2329         /*
2330          * Adjust the common context lines in postimage. This can be
2331          * done in-place when we are shrinking it with whitespace
2332          * fixing, but needs a new buffer when ignoring whitespace or
2333          * expanding leading tabs to spaces.
2334          *
2335          * We trust the caller to tell us if the update can be done
2336          * in place (postlen==0) or not.
2337          */
2338         old_buf = postimage->buf;
2339         if (postlen)
2340                 new_buf = postimage->buf = xmalloc(postlen);
2341         else
2342                 new_buf = old_buf;
2343         fixed = preimage->buf;
2344
2345         for (i = reduced = ctx = 0; i < postimage->nr; i++) {
2346                 size_t l_len = postimage->line[i].len;
2347                 if (!(postimage->line[i].flag & LINE_COMMON)) {
2348                         /* an added line -- no counterparts in preimage */
2349                         memmove(new_buf, old_buf, l_len);
2350                         old_buf += l_len;
2351                         new_buf += l_len;
2352                         continue;
2353                 }
2354
2355                 /* a common context -- skip it in the original postimage */
2356                 old_buf += l_len;
2357
2358                 /* and find the corresponding one in the fixed preimage */
2359                 while (ctx < preimage->nr &&
2360                        !(preimage->line[ctx].flag & LINE_COMMON)) {
2361                         fixed += preimage->line[ctx].len;
2362                         ctx++;
2363                 }
2364
2365                 /*
2366                  * preimage is expected to run out, if the caller
2367                  * fixed addition of trailing blank lines.
2368                  */
2369                 if (preimage->nr <= ctx) {
2370                         reduced++;
2371                         continue;
2372                 }
2373
2374                 /* and copy it in, while fixing the line length */
2375                 l_len = preimage->line[ctx].len;
2376                 memcpy(new_buf, fixed, l_len);
2377                 new_buf += l_len;
2378                 fixed += l_len;
2379                 postimage->line[i].len = l_len;
2380                 ctx++;
2381         }
2382
2383         if (postlen
2384             ? postlen < new_buf - postimage->buf
2385             : postimage->len < new_buf - postimage->buf)
2386                 BUG("caller miscounted postlen: asked %d, orig = %d, used = %d",
2387                     (int)postlen, (int) postimage->len, (int)(new_buf - postimage->buf));
2388
2389         /* Fix the length of the whole thing */
2390         postimage->len = new_buf - postimage->buf;
2391         postimage->nr -= reduced;
2392 }
2393
2394 static int line_by_line_fuzzy_match(struct image *img,
2395                                     struct image *preimage,
2396                                     struct image *postimage,
2397                                     unsigned long current,
2398                                     int current_lno,
2399                                     int preimage_limit)
2400 {
2401         int i;
2402         size_t imgoff = 0;
2403         size_t preoff = 0;
2404         size_t postlen = postimage->len;
2405         size_t extra_chars;
2406         char *buf;
2407         char *preimage_eof;
2408         char *preimage_end;
2409         struct strbuf fixed;
2410         char *fixed_buf;
2411         size_t fixed_len;
2412
2413         for (i = 0; i < preimage_limit; i++) {
2414                 size_t prelen = preimage->line[i].len;
2415                 size_t imglen = img->line[current_lno+i].len;
2416
2417                 if (!fuzzy_matchlines(img->buf + current + imgoff, imglen,
2418                                       preimage->buf + preoff, prelen))
2419                         return 0;
2420                 if (preimage->line[i].flag & LINE_COMMON)
2421                         postlen += imglen - prelen;
2422                 imgoff += imglen;
2423                 preoff += prelen;
2424         }
2425
2426         /*
2427          * Ok, the preimage matches with whitespace fuzz.
2428          *
2429          * imgoff now holds the true length of the target that
2430          * matches the preimage before the end of the file.
2431          *
2432          * Count the number of characters in the preimage that fall
2433          * beyond the end of the file and make sure that all of them
2434          * are whitespace characters. (This can only happen if
2435          * we are removing blank lines at the end of the file.)
2436          */
2437         buf = preimage_eof = preimage->buf + preoff;
2438         for ( ; i < preimage->nr; i++)
2439                 preoff += preimage->line[i].len;
2440         preimage_end = preimage->buf + preoff;
2441         for ( ; buf < preimage_end; buf++)
2442                 if (!isspace(*buf))
2443                         return 0;
2444
2445         /*
2446          * Update the preimage and the common postimage context
2447          * lines to use the same whitespace as the target.
2448          * If whitespace is missing in the target (i.e.
2449          * if the preimage extends beyond the end of the file),
2450          * use the whitespace from the preimage.
2451          */
2452         extra_chars = preimage_end - preimage_eof;
2453         strbuf_init(&fixed, imgoff + extra_chars);
2454         strbuf_add(&fixed, img->buf + current, imgoff);
2455         strbuf_add(&fixed, preimage_eof, extra_chars);
2456         fixed_buf = strbuf_detach(&fixed, &fixed_len);
2457         update_pre_post_images(preimage, postimage,
2458                                fixed_buf, fixed_len, postlen);
2459         return 1;
2460 }
2461
2462 static int match_fragment(struct apply_state *state,
2463                           struct image *img,
2464                           struct image *preimage,
2465                           struct image *postimage,
2466                           unsigned long current,
2467                           int current_lno,
2468                           unsigned ws_rule,
2469                           int match_beginning, int match_end)
2470 {
2471         int i;
2472         char *fixed_buf, *buf, *orig, *target;
2473         struct strbuf fixed;
2474         size_t fixed_len, postlen;
2475         int preimage_limit;
2476
2477         if (preimage->nr + current_lno <= img->nr) {
2478                 /*
2479                  * The hunk falls within the boundaries of img.
2480                  */
2481                 preimage_limit = preimage->nr;
2482                 if (match_end && (preimage->nr + current_lno != img->nr))
2483                         return 0;
2484         } else if (state->ws_error_action == correct_ws_error &&
2485                    (ws_rule & WS_BLANK_AT_EOF)) {
2486                 /*
2487                  * This hunk extends beyond the end of img, and we are
2488                  * removing blank lines at the end of the file.  This
2489                  * many lines from the beginning of the preimage must
2490                  * match with img, and the remainder of the preimage
2491                  * must be blank.
2492                  */
2493                 preimage_limit = img->nr - current_lno;
2494         } else {
2495                 /*
2496                  * The hunk extends beyond the end of the img and
2497                  * we are not removing blanks at the end, so we
2498                  * should reject the hunk at this position.
2499                  */
2500                 return 0;
2501         }
2502
2503         if (match_beginning && current_lno)
2504                 return 0;
2505
2506         /* Quick hash check */
2507         for (i = 0; i < preimage_limit; i++)
2508                 if ((img->line[current_lno + i].flag & LINE_PATCHED) ||
2509                     (preimage->line[i].hash != img->line[current_lno + i].hash))
2510                         return 0;
2511
2512         if (preimage_limit == preimage->nr) {
2513                 /*
2514                  * Do we have an exact match?  If we were told to match
2515                  * at the end, size must be exactly at current+fragsize,
2516                  * otherwise current+fragsize must be still within the preimage,
2517                  * and either case, the old piece should match the preimage
2518                  * exactly.
2519                  */
2520                 if ((match_end
2521                      ? (current + preimage->len == img->len)
2522                      : (current + preimage->len <= img->len)) &&
2523                     !memcmp(img->buf + current, preimage->buf, preimage->len))
2524                         return 1;
2525         } else {
2526                 /*
2527                  * The preimage extends beyond the end of img, so
2528                  * there cannot be an exact match.
2529                  *
2530                  * There must be one non-blank context line that match
2531                  * a line before the end of img.
2532                  */
2533                 char *buf_end;
2534
2535                 buf = preimage->buf;
2536                 buf_end = buf;
2537                 for (i = 0; i < preimage_limit; i++)
2538                         buf_end += preimage->line[i].len;
2539
2540                 for ( ; buf < buf_end; buf++)
2541                         if (!isspace(*buf))
2542                                 break;
2543                 if (buf == buf_end)
2544                         return 0;
2545         }
2546
2547         /*
2548          * No exact match. If we are ignoring whitespace, run a line-by-line
2549          * fuzzy matching. We collect all the line length information because
2550          * we need it to adjust whitespace if we match.
2551          */
2552         if (state->ws_ignore_action == ignore_ws_change)
2553                 return line_by_line_fuzzy_match(img, preimage, postimage,
2554                                                 current, current_lno, preimage_limit);
2555
2556         if (state->ws_error_action != correct_ws_error)
2557                 return 0;
2558
2559         /*
2560          * The hunk does not apply byte-by-byte, but the hash says
2561          * it might with whitespace fuzz. We weren't asked to
2562          * ignore whitespace, we were asked to correct whitespace
2563          * errors, so let's try matching after whitespace correction.
2564          *
2565          * While checking the preimage against the target, whitespace
2566          * errors in both fixed, we count how large the corresponding
2567          * postimage needs to be.  The postimage prepared by
2568          * apply_one_fragment() has whitespace errors fixed on added
2569          * lines already, but the common lines were propagated as-is,
2570          * which may become longer when their whitespace errors are
2571          * fixed.
2572          */
2573
2574         /* First count added lines in postimage */
2575         postlen = 0;
2576         for (i = 0; i < postimage->nr; i++) {
2577                 if (!(postimage->line[i].flag & LINE_COMMON))
2578                         postlen += postimage->line[i].len;
2579         }
2580
2581         /*
2582          * The preimage may extend beyond the end of the file,
2583          * but in this loop we will only handle the part of the
2584          * preimage that falls within the file.
2585          */
2586         strbuf_init(&fixed, preimage->len + 1);
2587         orig = preimage->buf;
2588         target = img->buf + current;
2589         for (i = 0; i < preimage_limit; i++) {
2590                 size_t oldlen = preimage->line[i].len;
2591                 size_t tgtlen = img->line[current_lno + i].len;
2592                 size_t fixstart = fixed.len;
2593                 struct strbuf tgtfix;
2594                 int match;
2595
2596                 /* Try fixing the line in the preimage */
2597                 ws_fix_copy(&fixed, orig, oldlen, ws_rule, NULL);
2598
2599                 /* Try fixing the line in the target */
2600                 strbuf_init(&tgtfix, tgtlen);
2601                 ws_fix_copy(&tgtfix, target, tgtlen, ws_rule, NULL);
2602
2603                 /*
2604                  * If they match, either the preimage was based on
2605                  * a version before our tree fixed whitespace breakage,
2606                  * or we are lacking a whitespace-fix patch the tree
2607                  * the preimage was based on already had (i.e. target
2608                  * has whitespace breakage, the preimage doesn't).
2609                  * In either case, we are fixing the whitespace breakages
2610                  * so we might as well take the fix together with their
2611                  * real change.
2612                  */
2613                 match = (tgtfix.len == fixed.len - fixstart &&
2614                          !memcmp(tgtfix.buf, fixed.buf + fixstart,
2615                                              fixed.len - fixstart));
2616
2617                 /* Add the length if this is common with the postimage */
2618                 if (preimage->line[i].flag & LINE_COMMON)
2619                         postlen += tgtfix.len;
2620
2621                 strbuf_release(&tgtfix);
2622                 if (!match)
2623                         goto unmatch_exit;
2624
2625                 orig += oldlen;
2626                 target += tgtlen;
2627         }
2628
2629
2630         /*
2631          * Now handle the lines in the preimage that falls beyond the
2632          * end of the file (if any). They will only match if they are
2633          * empty or only contain whitespace (if WS_BLANK_AT_EOL is
2634          * false).
2635          */
2636         for ( ; i < preimage->nr; i++) {
2637                 size_t fixstart = fixed.len; /* start of the fixed preimage */
2638                 size_t oldlen = preimage->line[i].len;
2639                 int j;
2640
2641                 /* Try fixing the line in the preimage */
2642                 ws_fix_copy(&fixed, orig, oldlen, ws_rule, NULL);
2643
2644                 for (j = fixstart; j < fixed.len; j++)
2645                         if (!isspace(fixed.buf[j]))
2646                                 goto unmatch_exit;
2647
2648                 orig += oldlen;
2649         }
2650
2651         /*
2652          * Yes, the preimage is based on an older version that still
2653          * has whitespace breakages unfixed, and fixing them makes the
2654          * hunk match.  Update the context lines in the postimage.
2655          */
2656         fixed_buf = strbuf_detach(&fixed, &fixed_len);
2657         if (postlen < postimage->len)
2658                 postlen = 0;
2659         update_pre_post_images(preimage, postimage,
2660                                fixed_buf, fixed_len, postlen);
2661         return 1;
2662
2663  unmatch_exit:
2664         strbuf_release(&fixed);
2665         return 0;
2666 }
2667
2668 static int find_pos(struct apply_state *state,
2669                     struct image *img,
2670                     struct image *preimage,
2671                     struct image *postimage,
2672                     int line,
2673                     unsigned ws_rule,
2674                     int match_beginning, int match_end)
2675 {
2676         int i;
2677         unsigned long backwards, forwards, current;
2678         int backwards_lno, forwards_lno, current_lno;
2679
2680         /*
2681          * If match_beginning or match_end is specified, there is no
2682          * point starting from a wrong line that will never match and
2683          * wander around and wait for a match at the specified end.
2684          */
2685         if (match_beginning)
2686                 line = 0;
2687         else if (match_end)
2688                 line = img->nr - preimage->nr;
2689
2690         /*
2691          * Because the comparison is unsigned, the following test
2692          * will also take care of a negative line number that can
2693          * result when match_end and preimage is larger than the target.
2694          */
2695         if ((size_t) line > img->nr)
2696                 line = img->nr;
2697
2698         current = 0;
2699         for (i = 0; i < line; i++)
2700                 current += img->line[i].len;
2701
2702         /*
2703          * There's probably some smart way to do this, but I'll leave
2704          * that to the smart and beautiful people. I'm simple and stupid.
2705          */
2706         backwards = current;
2707         backwards_lno = line;
2708         forwards = current;
2709         forwards_lno = line;
2710         current_lno = line;
2711
2712         for (i = 0; ; i++) {
2713                 if (match_fragment(state, img, preimage, postimage,
2714                                    current, current_lno, ws_rule,
2715                                    match_beginning, match_end))
2716                         return current_lno;
2717
2718         again:
2719                 if (backwards_lno == 0 && forwards_lno == img->nr)
2720                         break;
2721
2722                 if (i & 1) {
2723                         if (backwards_lno == 0) {
2724                                 i++;
2725                                 goto again;
2726                         }
2727                         backwards_lno--;
2728                         backwards -= img->line[backwards_lno].len;
2729                         current = backwards;
2730                         current_lno = backwards_lno;
2731                 } else {
2732                         if (forwards_lno == img->nr) {
2733                                 i++;
2734                                 goto again;
2735                         }
2736                         forwards += img->line[forwards_lno].len;
2737                         forwards_lno++;
2738                         current = forwards;
2739                         current_lno = forwards_lno;
2740                 }
2741
2742         }
2743         return -1;
2744 }
2745
2746 static void remove_first_line(struct image *img)
2747 {
2748         img->buf += img->line[0].len;
2749         img->len -= img->line[0].len;
2750         img->line++;
2751         img->nr--;
2752 }
2753
2754 static void remove_last_line(struct image *img)
2755 {
2756         img->len -= img->line[--img->nr].len;
2757 }
2758
2759 /*
2760  * The change from "preimage" and "postimage" has been found to
2761  * apply at applied_pos (counts in line numbers) in "img".
2762  * Update "img" to remove "preimage" and replace it with "postimage".
2763  */
2764 static void update_image(struct apply_state *state,
2765                          struct image *img,
2766                          int applied_pos,
2767                          struct image *preimage,
2768                          struct image *postimage)
2769 {
2770         /*
2771          * remove the copy of preimage at offset in img
2772          * and replace it with postimage
2773          */
2774         int i, nr;
2775         size_t remove_count, insert_count, applied_at = 0;
2776         char *result;
2777         int preimage_limit;
2778
2779         /*
2780          * If we are removing blank lines at the end of img,
2781          * the preimage may extend beyond the end.
2782          * If that is the case, we must be careful only to
2783          * remove the part of the preimage that falls within
2784          * the boundaries of img. Initialize preimage_limit
2785          * to the number of lines in the preimage that falls
2786          * within the boundaries.
2787          */
2788         preimage_limit = preimage->nr;
2789         if (preimage_limit > img->nr - applied_pos)
2790                 preimage_limit = img->nr - applied_pos;
2791
2792         for (i = 0; i < applied_pos; i++)
2793                 applied_at += img->line[i].len;
2794
2795         remove_count = 0;
2796         for (i = 0; i < preimage_limit; i++)
2797                 remove_count += img->line[applied_pos + i].len;
2798         insert_count = postimage->len;
2799
2800         /* Adjust the contents */
2801         result = xmalloc(st_add3(st_sub(img->len, remove_count), insert_count, 1));
2802         memcpy(result, img->buf, applied_at);
2803         memcpy(result + applied_at, postimage->buf, postimage->len);
2804         memcpy(result + applied_at + postimage->len,
2805                img->buf + (applied_at + remove_count),
2806                img->len - (applied_at + remove_count));
2807         free(img->buf);
2808         img->buf = result;
2809         img->len += insert_count - remove_count;
2810         result[img->len] = '\0';
2811
2812         /* Adjust the line table */
2813         nr = img->nr + postimage->nr - preimage_limit;
2814         if (preimage_limit < postimage->nr) {
2815                 /*
2816                  * NOTE: this knows that we never call remove_first_line()
2817                  * on anything other than pre/post image.
2818                  */
2819                 REALLOC_ARRAY(img->line, nr);
2820                 img->line_allocated = img->line;
2821         }
2822         if (preimage_limit != postimage->nr)
2823                 MOVE_ARRAY(img->line + applied_pos + postimage->nr,
2824                            img->line + applied_pos + preimage_limit,
2825                            img->nr - (applied_pos + preimage_limit));
2826         COPY_ARRAY(img->line + applied_pos, postimage->line, postimage->nr);
2827         if (!state->allow_overlap)
2828                 for (i = 0; i < postimage->nr; i++)
2829                         img->line[applied_pos + i].flag |= LINE_PATCHED;
2830         img->nr = nr;
2831 }
2832
2833 /*
2834  * Use the patch-hunk text in "frag" to prepare two images (preimage and
2835  * postimage) for the hunk.  Find lines that match "preimage" in "img" and
2836  * replace the part of "img" with "postimage" text.
2837  */
2838 static int apply_one_fragment(struct apply_state *state,
2839                               struct image *img, struct fragment *frag,
2840                               int inaccurate_eof, unsigned ws_rule,
2841                               int nth_fragment)
2842 {
2843         int match_beginning, match_end;
2844         const char *patch = frag->patch;
2845         int size = frag->size;
2846         char *old, *oldlines;
2847         struct strbuf newlines;
2848         int new_blank_lines_at_end = 0;
2849         int found_new_blank_lines_at_end = 0;
2850         int hunk_linenr = frag->linenr;
2851         unsigned long leading, trailing;
2852         int pos, applied_pos;
2853         struct image preimage;
2854         struct image postimage;
2855
2856         memset(&preimage, 0, sizeof(preimage));
2857         memset(&postimage, 0, sizeof(postimage));
2858         oldlines = xmalloc(size);
2859         strbuf_init(&newlines, size);
2860
2861         old = oldlines;
2862         while (size > 0) {
2863                 char first;
2864                 int len = linelen(patch, size);
2865                 int plen;
2866                 int added_blank_line = 0;
2867                 int is_blank_context = 0;
2868                 size_t start;
2869
2870                 if (!len)
2871                         break;
2872
2873                 /*
2874                  * "plen" is how much of the line we should use for
2875                  * the actual patch data. Normally we just remove the
2876                  * first character on the line, but if the line is
2877                  * followed by "\ No newline", then we also remove the
2878                  * last one (which is the newline, of course).
2879                  */
2880                 plen = len - 1;
2881                 if (len < size && patch[len] == '\\')
2882                         plen--;
2883                 first = *patch;
2884                 if (state->apply_in_reverse) {
2885                         if (first == '-')
2886                                 first = '+';
2887                         else if (first == '+')
2888                                 first = '-';
2889                 }
2890
2891                 switch (first) {
2892                 case '\n':
2893                         /* Newer GNU diff, empty context line */
2894                         if (plen < 0)
2895                                 /* ... followed by '\No newline'; nothing */
2896                                 break;
2897                         *old++ = '\n';
2898                         strbuf_addch(&newlines, '\n');
2899                         add_line_info(&preimage, "\n", 1, LINE_COMMON);
2900                         add_line_info(&postimage, "\n", 1, LINE_COMMON);
2901                         is_blank_context = 1;
2902                         break;
2903                 case ' ':
2904                         if (plen && (ws_rule & WS_BLANK_AT_EOF) &&
2905                             ws_blank_line(patch + 1, plen, ws_rule))
2906                                 is_blank_context = 1;
2907                         /* fallthrough */
2908                 case '-':
2909                         memcpy(old, patch + 1, plen);
2910                         add_line_info(&preimage, old, plen,
2911                                       (first == ' ' ? LINE_COMMON : 0));
2912                         old += plen;
2913                         if (first == '-')
2914                                 break;
2915                         /* fallthrough */
2916                 case '+':
2917                         /* --no-add does not add new lines */
2918                         if (first == '+' && state->no_add)
2919                                 break;
2920
2921                         start = newlines.len;
2922                         if (first != '+' ||
2923                             !state->whitespace_error ||
2924                             state->ws_error_action != correct_ws_error) {
2925                                 strbuf_add(&newlines, patch + 1, plen);
2926                         }
2927                         else {
2928                                 ws_fix_copy(&newlines, patch + 1, plen, ws_rule, &state->applied_after_fixing_ws);
2929                         }
2930                         add_line_info(&postimage, newlines.buf + start, newlines.len - start,
2931                                       (first == '+' ? 0 : LINE_COMMON));
2932                         if (first == '+' &&
2933                             (ws_rule & WS_BLANK_AT_EOF) &&
2934                             ws_blank_line(patch + 1, plen, ws_rule))
2935                                 added_blank_line = 1;
2936                         break;
2937                 case '@': case '\\':
2938                         /* Ignore it, we already handled it */
2939                         break;
2940                 default:
2941                         if (state->apply_verbosity > verbosity_normal)
2942                                 error(_("invalid start of line: '%c'"), first);
2943                         applied_pos = -1;
2944                         goto out;
2945                 }
2946                 if (added_blank_line) {
2947                         if (!new_blank_lines_at_end)
2948                                 found_new_blank_lines_at_end = hunk_linenr;
2949                         new_blank_lines_at_end++;
2950                 }
2951                 else if (is_blank_context)
2952                         ;
2953                 else
2954                         new_blank_lines_at_end = 0;
2955                 patch += len;
2956                 size -= len;
2957                 hunk_linenr++;
2958         }
2959         if (inaccurate_eof &&
2960             old > oldlines && old[-1] == '\n' &&
2961             newlines.len > 0 && newlines.buf[newlines.len - 1] == '\n') {
2962                 old--;
2963                 strbuf_setlen(&newlines, newlines.len - 1);
2964                 preimage.line_allocated[preimage.nr - 1].len--;
2965                 postimage.line_allocated[postimage.nr - 1].len--;
2966         }
2967
2968         leading = frag->leading;
2969         trailing = frag->trailing;
2970
2971         /*
2972          * A hunk to change lines at the beginning would begin with
2973          * @@ -1,L +N,M @@
2974          * but we need to be careful.  -U0 that inserts before the second
2975          * line also has this pattern.
2976          *
2977          * And a hunk to add to an empty file would begin with
2978          * @@ -0,0 +N,M @@
2979          *
2980          * In other words, a hunk that is (frag->oldpos <= 1) with or
2981          * without leading context must match at the beginning.
2982          */
2983         match_beginning = (!frag->oldpos ||
2984                            (frag->oldpos == 1 && !state->unidiff_zero));
2985
2986         /*
2987          * A hunk without trailing lines must match at the end.
2988          * However, we simply cannot tell if a hunk must match end
2989          * from the lack of trailing lines if the patch was generated
2990          * with unidiff without any context.
2991          */
2992         match_end = !state->unidiff_zero && !trailing;
2993
2994         pos = frag->newpos ? (frag->newpos - 1) : 0;
2995         preimage.buf = oldlines;
2996         preimage.len = old - oldlines;
2997         postimage.buf = newlines.buf;
2998         postimage.len = newlines.len;
2999         preimage.line = preimage.line_allocated;
3000         postimage.line = postimage.line_allocated;
3001
3002         for (;;) {
3003
3004                 applied_pos = find_pos(state, img, &preimage, &postimage, pos,
3005                                        ws_rule, match_beginning, match_end);
3006
3007                 if (applied_pos >= 0)
3008                         break;
3009
3010                 /* Am I at my context limits? */
3011                 if ((leading <= state->p_context) && (trailing <= state->p_context))
3012                         break;
3013                 if (match_beginning || match_end) {
3014                         match_beginning = match_end = 0;
3015                         continue;
3016                 }
3017
3018                 /*
3019                  * Reduce the number of context lines; reduce both
3020                  * leading and trailing if they are equal otherwise
3021                  * just reduce the larger context.
3022                  */
3023                 if (leading >= trailing) {
3024                         remove_first_line(&preimage);
3025                         remove_first_line(&postimage);
3026                         pos--;
3027                         leading--;
3028                 }
3029                 if (trailing > leading) {
3030                         remove_last_line(&preimage);
3031                         remove_last_line(&postimage);
3032                         trailing--;
3033                 }
3034         }
3035
3036         if (applied_pos >= 0) {
3037                 if (new_blank_lines_at_end &&
3038                     preimage.nr + applied_pos >= img->nr &&
3039                     (ws_rule & WS_BLANK_AT_EOF) &&
3040                     state->ws_error_action != nowarn_ws_error) {
3041                         record_ws_error(state, WS_BLANK_AT_EOF, "+", 1,
3042                                         found_new_blank_lines_at_end);
3043                         if (state->ws_error_action == correct_ws_error) {
3044                                 while (new_blank_lines_at_end--)
3045                                         remove_last_line(&postimage);
3046                         }
3047                         /*
3048                          * We would want to prevent write_out_results()
3049                          * from taking place in apply_patch() that follows
3050                          * the callchain led us here, which is:
3051                          * apply_patch->check_patch_list->check_patch->
3052                          * apply_data->apply_fragments->apply_one_fragment
3053                          */
3054                         if (state->ws_error_action == die_on_ws_error)
3055                                 state->apply = 0;
3056                 }
3057
3058                 if (state->apply_verbosity > verbosity_normal && applied_pos != pos) {
3059                         int offset = applied_pos - pos;
3060                         if (state->apply_in_reverse)
3061                                 offset = 0 - offset;
3062                         fprintf_ln(stderr,
3063                                    Q_("Hunk #%d succeeded at %d (offset %d line).",
3064                                       "Hunk #%d succeeded at %d (offset %d lines).",
3065                                       offset),
3066                                    nth_fragment, applied_pos + 1, offset);
3067                 }
3068
3069                 /*
3070                  * Warn if it was necessary to reduce the number
3071                  * of context lines.
3072                  */
3073                 if ((leading != frag->leading ||
3074                      trailing != frag->trailing) && state->apply_verbosity > verbosity_silent)
3075                         fprintf_ln(stderr, _("Context reduced to (%ld/%ld)"
3076                                              " to apply fragment at %d"),
3077                                    leading, trailing, applied_pos+1);
3078                 update_image(state, img, applied_pos, &preimage, &postimage);
3079         } else {
3080                 if (state->apply_verbosity > verbosity_normal)
3081                         error(_("while searching for:\n%.*s"),
3082                               (int)(old - oldlines), oldlines);
3083         }
3084
3085 out:
3086         free(oldlines);
3087         strbuf_release(&newlines);
3088         free(preimage.line_allocated);
3089         free(postimage.line_allocated);
3090
3091         return (applied_pos < 0);
3092 }
3093
3094 static int apply_binary_fragment(struct apply_state *state,
3095                                  struct image *img,
3096                                  struct patch *patch)
3097 {
3098         struct fragment *fragment = patch->fragments;
3099         unsigned long len;
3100         void *dst;
3101
3102         if (!fragment)
3103                 return error(_("missing binary patch data for '%s'"),
3104                              patch->new_name ?
3105                              patch->new_name :
3106                              patch->old_name);
3107
3108         /* Binary patch is irreversible without the optional second hunk */
3109         if (state->apply_in_reverse) {
3110                 if (!fragment->next)
3111                         return error(_("cannot reverse-apply a binary patch "
3112                                        "without the reverse hunk to '%s'"),
3113                                      patch->new_name
3114                                      ? patch->new_name : patch->old_name);
3115                 fragment = fragment->next;
3116         }
3117         switch (fragment->binary_patch_method) {
3118         case BINARY_DELTA_DEFLATED:
3119                 dst = patch_delta(img->buf, img->len, fragment->patch,
3120                                   fragment->size, &len);
3121                 if (!dst)
3122                         return -1;
3123                 clear_image(img);
3124                 img->buf = dst;
3125                 img->len = len;
3126                 return 0;
3127         case BINARY_LITERAL_DEFLATED:
3128                 clear_image(img);
3129                 img->len = fragment->size;
3130                 img->buf = xmemdupz(fragment->patch, img->len);
3131                 return 0;
3132         }
3133         return -1;
3134 }
3135
3136 /*
3137  * Replace "img" with the result of applying the binary patch.
3138  * The binary patch data itself in patch->fragment is still kept
3139  * but the preimage prepared by the caller in "img" is freed here
3140  * or in the helper function apply_binary_fragment() this calls.
3141  */
3142 static int apply_binary(struct apply_state *state,
3143                         struct image *img,
3144                         struct patch *patch)
3145 {
3146         const char *name = patch->old_name ? patch->old_name : patch->new_name;
3147         struct object_id oid;
3148         const unsigned hexsz = the_hash_algo->hexsz;
3149
3150         /*
3151          * For safety, we require patch index line to contain
3152          * full hex textual object ID for old and new, at least for now.
3153          */
3154         if (strlen(patch->old_oid_prefix) != hexsz ||
3155             strlen(patch->new_oid_prefix) != hexsz ||
3156             get_oid_hex(patch->old_oid_prefix, &oid) ||
3157             get_oid_hex(patch->new_oid_prefix, &oid))
3158                 return error(_("cannot apply binary patch to '%s' "
3159                                "without full index line"), name);
3160
3161         if (patch->old_name) {
3162                 /*
3163                  * See if the old one matches what the patch
3164                  * applies to.
3165                  */
3166                 hash_object_file(img->buf, img->len, blob_type, &oid);
3167                 if (strcmp(oid_to_hex(&oid), patch->old_oid_prefix))
3168                         return error(_("the patch applies to '%s' (%s), "
3169                                        "which does not match the "
3170                                        "current contents."),
3171                                      name, oid_to_hex(&oid));
3172         }
3173         else {
3174                 /* Otherwise, the old one must be empty. */
3175                 if (img->len)
3176                         return error(_("the patch applies to an empty "
3177                                        "'%s' but it is not empty"), name);
3178         }
3179
3180         get_oid_hex(patch->new_oid_prefix, &oid);
3181         if (is_null_oid(&oid)) {
3182                 clear_image(img);
3183                 return 0; /* deletion patch */
3184         }
3185
3186         if (has_sha1_file(oid.hash)) {
3187                 /* We already have the postimage */
3188                 enum object_type type;
3189                 unsigned long size;
3190                 char *result;
3191
3192                 result = read_object_file(&oid, &type, &size);
3193                 if (!result)
3194                         return error(_("the necessary postimage %s for "
3195                                        "'%s' cannot be read"),
3196                                      patch->new_oid_prefix, name);
3197                 clear_image(img);
3198                 img->buf = result;
3199                 img->len = size;
3200         } else {
3201                 /*
3202                  * We have verified buf matches the preimage;
3203                  * apply the patch data to it, which is stored
3204                  * in the patch->fragments->{patch,size}.
3205                  */
3206                 if (apply_binary_fragment(state, img, patch))
3207                         return error(_("binary patch does not apply to '%s'"),
3208                                      name);
3209
3210                 /* verify that the result matches */
3211                 hash_object_file(img->buf, img->len, blob_type, &oid);
3212                 if (strcmp(oid_to_hex(&oid), patch->new_oid_prefix))
3213                         return error(_("binary patch to '%s' creates incorrect result (expecting %s, got %s)"),
3214                                 name, patch->new_oid_prefix, oid_to_hex(&oid));
3215         }
3216
3217         return 0;
3218 }
3219
3220 static int apply_fragments(struct apply_state *state, struct image *img, struct patch *patch)
3221 {
3222         struct fragment *frag = patch->fragments;
3223         const char *name = patch->old_name ? patch->old_name : patch->new_name;
3224         unsigned ws_rule = patch->ws_rule;
3225         unsigned inaccurate_eof = patch->inaccurate_eof;
3226         int nth = 0;
3227
3228         if (patch->is_binary)
3229                 return apply_binary(state, img, patch);
3230
3231         while (frag) {
3232                 nth++;
3233                 if (apply_one_fragment(state, img, frag, inaccurate_eof, ws_rule, nth)) {
3234                         error(_("patch failed: %s:%ld"), name, frag->oldpos);
3235                         if (!state->apply_with_reject)
3236                                 return -1;
3237                         frag->rejected = 1;
3238                 }
3239                 frag = frag->next;
3240         }
3241         return 0;
3242 }
3243
3244 static int read_blob_object(struct strbuf *buf, const struct object_id *oid, unsigned mode)
3245 {
3246         if (S_ISGITLINK(mode)) {
3247                 strbuf_grow(buf, 100);
3248                 strbuf_addf(buf, "Subproject commit %s\n", oid_to_hex(oid));
3249         } else {
3250                 enum object_type type;
3251                 unsigned long sz;
3252                 char *result;
3253
3254                 result = read_object_file(oid, &type, &sz);
3255                 if (!result)
3256                         return -1;
3257                 /* XXX read_sha1_file NUL-terminates */
3258                 strbuf_attach(buf, result, sz, sz + 1);
3259         }
3260         return 0;
3261 }
3262
3263 static int read_file_or_gitlink(const struct cache_entry *ce, struct strbuf *buf)
3264 {
3265         if (!ce)
3266                 return 0;
3267         return read_blob_object(buf, &ce->oid, ce->ce_mode);
3268 }
3269
3270 static struct patch *in_fn_table(struct apply_state *state, const char *name)
3271 {
3272         struct string_list_item *item;
3273
3274         if (name == NULL)
3275                 return NULL;
3276
3277         item = string_list_lookup(&state->fn_table, name);
3278         if (item != NULL)
3279                 return (struct patch *)item->util;
3280
3281         return NULL;
3282 }
3283
3284 /*
3285  * item->util in the filename table records the status of the path.
3286  * Usually it points at a patch (whose result records the contents
3287  * of it after applying it), but it could be PATH_WAS_DELETED for a
3288  * path that a previously applied patch has already removed, or
3289  * PATH_TO_BE_DELETED for a path that a later patch would remove.
3290  *
3291  * The latter is needed to deal with a case where two paths A and B
3292  * are swapped by first renaming A to B and then renaming B to A;
3293  * moving A to B should not be prevented due to presence of B as we
3294  * will remove it in a later patch.
3295  */
3296 #define PATH_TO_BE_DELETED ((struct patch *) -2)
3297 #define PATH_WAS_DELETED ((struct patch *) -1)
3298
3299 static int to_be_deleted(struct patch *patch)
3300 {
3301         return patch == PATH_TO_BE_DELETED;
3302 }
3303
3304 static int was_deleted(struct patch *patch)
3305 {
3306         return patch == PATH_WAS_DELETED;
3307 }
3308
3309 static void add_to_fn_table(struct apply_state *state, struct patch *patch)
3310 {
3311         struct string_list_item *item;
3312
3313         /*
3314          * Always add new_name unless patch is a deletion
3315          * This should cover the cases for normal diffs,
3316          * file creations and copies
3317          */
3318         if (patch->new_name != NULL) {
3319                 item = string_list_insert(&state->fn_table, patch->new_name);
3320                 item->util = patch;
3321         }
3322
3323         /*
3324          * store a failure on rename/deletion cases because
3325          * later chunks shouldn't patch old names
3326          */
3327         if ((patch->new_name == NULL) || (patch->is_rename)) {
3328                 item = string_list_insert(&state->fn_table, patch->old_name);
3329                 item->util = PATH_WAS_DELETED;
3330         }
3331 }
3332
3333 static void prepare_fn_table(struct apply_state *state, struct patch *patch)
3334 {
3335         /*
3336          * store information about incoming file deletion
3337          */
3338         while (patch) {
3339                 if ((patch->new_name == NULL) || (patch->is_rename)) {
3340                         struct string_list_item *item;
3341                         item = string_list_insert(&state->fn_table, patch->old_name);
3342                         item->util = PATH_TO_BE_DELETED;
3343                 }
3344                 patch = patch->next;
3345         }
3346 }
3347
3348 static int checkout_target(struct index_state *istate,
3349                            struct cache_entry *ce, struct stat *st)
3350 {
3351         struct checkout costate = CHECKOUT_INIT;
3352
3353         costate.refresh_cache = 1;
3354         costate.istate = istate;
3355         if (checkout_entry(ce, &costate, NULL) || lstat(ce->name, st))
3356                 return error(_("cannot checkout %s"), ce->name);
3357         return 0;
3358 }
3359
3360 static struct patch *previous_patch(struct apply_state *state,
3361                                     struct patch *patch,
3362                                     int *gone)
3363 {
3364         struct patch *previous;
3365
3366         *gone = 0;
3367         if (patch->is_copy || patch->is_rename)
3368                 return NULL; /* "git" patches do not depend on the order */
3369
3370         previous = in_fn_table(state, patch->old_name);
3371         if (!previous)
3372                 return NULL;
3373
3374         if (to_be_deleted(previous))
3375                 return NULL; /* the deletion hasn't happened yet */
3376
3377         if (was_deleted(previous))
3378                 *gone = 1;
3379
3380         return previous;
3381 }
3382
3383 static int verify_index_match(struct apply_state *state,
3384                               const struct cache_entry *ce,
3385                               struct stat *st)
3386 {
3387         if (S_ISGITLINK(ce->ce_mode)) {
3388                 if (!S_ISDIR(st->st_mode))
3389                         return -1;
3390                 return 0;
3391         }
3392         return ie_match_stat(state->repo->index, ce, st,
3393                              CE_MATCH_IGNORE_VALID | CE_MATCH_IGNORE_SKIP_WORKTREE);
3394 }
3395
3396 #define SUBMODULE_PATCH_WITHOUT_INDEX 1
3397
3398 static int load_patch_target(struct apply_state *state,
3399                              struct strbuf *buf,
3400                              const struct cache_entry *ce,
3401                              struct stat *st,
3402                              struct patch *patch,
3403                              const char *name,
3404                              unsigned expected_mode)
3405 {
3406         if (state->cached || state->check_index) {
3407                 if (read_file_or_gitlink(ce, buf))
3408                         return error(_("failed to read %s"), name);
3409         } else if (name) {
3410                 if (S_ISGITLINK(expected_mode)) {
3411                         if (ce)
3412                                 return read_file_or_gitlink(ce, buf);
3413                         else
3414                                 return SUBMODULE_PATCH_WITHOUT_INDEX;
3415                 } else if (has_symlink_leading_path(name, strlen(name))) {
3416                         return error(_("reading from '%s' beyond a symbolic link"), name);
3417                 } else {
3418                         if (read_old_data(st, patch, name, buf))
3419                                 return error(_("failed to read %s"), name);
3420                 }
3421         }
3422         return 0;
3423 }
3424
3425 /*
3426  * We are about to apply "patch"; populate the "image" with the
3427  * current version we have, from the working tree or from the index,
3428  * depending on the situation e.g. --cached/--index.  If we are
3429  * applying a non-git patch that incrementally updates the tree,
3430  * we read from the result of a previous diff.
3431  */
3432 static int load_preimage(struct apply_state *state,
3433                          struct image *image,
3434                          struct patch *patch, struct stat *st,
3435                          const struct cache_entry *ce)
3436 {
3437         struct strbuf buf = STRBUF_INIT;
3438         size_t len;
3439         char *img;
3440         struct patch *previous;
3441         int status;
3442
3443         previous = previous_patch(state, patch, &status);
3444         if (status)
3445                 return error(_("path %s has been renamed/deleted"),
3446                              patch->old_name);
3447         if (previous) {
3448                 /* We have a patched copy in memory; use that. */
3449                 strbuf_add(&buf, previous->result, previous->resultsize);
3450         } else {
3451                 status = load_patch_target(state, &buf, ce, st, patch,
3452                                            patch->old_name, patch->old_mode);
3453                 if (status < 0)
3454                         return status;
3455                 else if (status == SUBMODULE_PATCH_WITHOUT_INDEX) {
3456                         /*
3457                          * There is no way to apply subproject
3458                          * patch without looking at the index.
3459                          * NEEDSWORK: shouldn't this be flagged
3460                          * as an error???
3461                          */
3462                         free_fragment_list(patch->fragments);
3463                         patch->fragments = NULL;
3464                 } else if (status) {
3465                         return error(_("failed to read %s"), patch->old_name);
3466                 }
3467         }
3468
3469         img = strbuf_detach(&buf, &len);
3470         prepare_image(image, img, len, !patch->is_binary);
3471         return 0;
3472 }
3473
3474 static int three_way_merge(struct apply_state *state,
3475                            struct image *image,
3476                            char *path,
3477                            const struct object_id *base,
3478                            const struct object_id *ours,
3479                            const struct object_id *theirs)
3480 {
3481         mmfile_t base_file, our_file, their_file;
3482         mmbuffer_t result = { NULL };
3483         int status;
3484
3485         read_mmblob(&base_file, base);
3486         read_mmblob(&our_file, ours);
3487         read_mmblob(&their_file, theirs);
3488         status = ll_merge(&result, path,
3489                           &base_file, "base",
3490                           &our_file, "ours",
3491                           &their_file, "theirs",
3492                           state->repo->index,
3493                           NULL);
3494         free(base_file.ptr);
3495         free(our_file.ptr);
3496         free(their_file.ptr);
3497         if (status < 0 || !result.ptr) {
3498                 free(result.ptr);
3499                 return -1;
3500         }
3501         clear_image(image);
3502         image->buf = result.ptr;
3503         image->len = result.size;
3504
3505         return status;
3506 }
3507
3508 /*
3509  * When directly falling back to add/add three-way merge, we read from
3510  * the current contents of the new_name.  In no cases other than that
3511  * this function will be called.
3512  */
3513 static int load_current(struct apply_state *state,
3514                         struct image *image,
3515                         struct patch *patch)
3516 {
3517         struct strbuf buf = STRBUF_INIT;
3518         int status, pos;
3519         size_t len;
3520         char *img;
3521         struct stat st;
3522         struct cache_entry *ce;
3523         char *name = patch->new_name;
3524         unsigned mode = patch->new_mode;
3525
3526         if (!patch->is_new)
3527                 BUG("patch to %s is not a creation", patch->old_name);
3528
3529         pos = index_name_pos(state->repo->index, name, strlen(name));
3530         if (pos < 0)
3531                 return error(_("%s: does not exist in index"), name);
3532         ce = state->repo->index->cache[pos];
3533         if (lstat(name, &st)) {
3534                 if (errno != ENOENT)
3535                         return error_errno("%s", name);
3536                 if (checkout_target(state->repo->index, ce, &st))
3537                         return -1;
3538         }
3539         if (verify_index_match(state, ce, &st))
3540                 return error(_("%s: does not match index"), name);
3541
3542         status = load_patch_target(state, &buf, ce, &st, patch, name, mode);
3543         if (status < 0)
3544                 return status;
3545         else if (status)
3546                 return -1;
3547         img = strbuf_detach(&buf, &len);
3548         prepare_image(image, img, len, !patch->is_binary);
3549         return 0;
3550 }
3551
3552 static int try_threeway(struct apply_state *state,
3553                         struct image *image,
3554                         struct patch *patch,
3555                         struct stat *st,
3556                         const struct cache_entry *ce)
3557 {
3558         struct object_id pre_oid, post_oid, our_oid;
3559         struct strbuf buf = STRBUF_INIT;
3560         size_t len;
3561         int status;
3562         char *img;
3563         struct image tmp_image;
3564
3565         /* No point falling back to 3-way merge in these cases */
3566         if (patch->is_delete ||
3567             S_ISGITLINK(patch->old_mode) || S_ISGITLINK(patch->new_mode))
3568                 return -1;
3569
3570         /* Preimage the patch was prepared for */
3571         if (patch->is_new)
3572                 write_object_file("", 0, blob_type, &pre_oid);
3573         else if (get_oid(patch->old_oid_prefix, &pre_oid) ||
3574                  read_blob_object(&buf, &pre_oid, patch->old_mode))
3575                 return error(_("repository lacks the necessary blob to fall back on 3-way merge."));
3576
3577         if (state->apply_verbosity > verbosity_silent)
3578                 fprintf(stderr, _("Falling back to three-way merge...\n"));
3579
3580         img = strbuf_detach(&buf, &len);
3581         prepare_image(&tmp_image, img, len, 1);
3582         /* Apply the patch to get the post image */
3583         if (apply_fragments(state, &tmp_image, patch) < 0) {
3584                 clear_image(&tmp_image);
3585                 return -1;
3586         }
3587         /* post_oid is theirs */
3588         write_object_file(tmp_image.buf, tmp_image.len, blob_type, &post_oid);
3589         clear_image(&tmp_image);
3590
3591         /* our_oid is ours */
3592         if (patch->is_new) {
3593                 if (load_current(state, &tmp_image, patch))
3594                         return error(_("cannot read the current contents of '%s'"),
3595                                      patch->new_name);
3596         } else {
3597                 if (load_preimage(state, &tmp_image, patch, st, ce))
3598                         return error(_("cannot read the current contents of '%s'"),
3599                                      patch->old_name);
3600         }
3601         write_object_file(tmp_image.buf, tmp_image.len, blob_type, &our_oid);
3602         clear_image(&tmp_image);
3603
3604         /* in-core three-way merge between post and our using pre as base */
3605         status = three_way_merge(state, image, patch->new_name,
3606                                  &pre_oid, &our_oid, &post_oid);
3607         if (status < 0) {
3608                 if (state->apply_verbosity > verbosity_silent)
3609                         fprintf(stderr,
3610                                 _("Failed to fall back on three-way merge...\n"));
3611                 return status;
3612         }
3613
3614         if (status) {
3615                 patch->conflicted_threeway = 1;
3616                 if (patch->is_new)
3617                         oidclr(&patch->threeway_stage[0]);
3618                 else
3619                         oidcpy(&patch->threeway_stage[0], &pre_oid);
3620                 oidcpy(&patch->threeway_stage[1], &our_oid);
3621                 oidcpy(&patch->threeway_stage[2], &post_oid);
3622                 if (state->apply_verbosity > verbosity_silent)
3623                         fprintf(stderr,
3624                                 _("Applied patch to '%s' with conflicts.\n"),
3625                                 patch->new_name);
3626         } else {
3627                 if (state->apply_verbosity > verbosity_silent)
3628                         fprintf(stderr,
3629                                 _("Applied patch to '%s' cleanly.\n"),
3630                                 patch->new_name);
3631         }
3632         return 0;
3633 }
3634
3635 static int apply_data(struct apply_state *state, struct patch *patch,
3636                       struct stat *st, const struct cache_entry *ce)
3637 {
3638         struct image image;
3639
3640         if (load_preimage(state, &image, patch, st, ce) < 0)
3641                 return -1;
3642
3643         if (patch->direct_to_threeway ||
3644             apply_fragments(state, &image, patch) < 0) {
3645                 /* Note: with --reject, apply_fragments() returns 0 */
3646                 if (!state->threeway || try_threeway(state, &image, patch, st, ce) < 0)
3647                         return -1;
3648         }
3649         patch->result = image.buf;
3650         patch->resultsize = image.len;
3651         add_to_fn_table(state, patch);
3652         free(image.line_allocated);
3653
3654         if (0 < patch->is_delete && patch->resultsize)
3655                 return error(_("removal patch leaves file contents"));
3656
3657         return 0;
3658 }
3659
3660 /*
3661  * If "patch" that we are looking at modifies or deletes what we have,
3662  * we would want it not to lose any local modification we have, either
3663  * in the working tree or in the index.
3664  *
3665  * This also decides if a non-git patch is a creation patch or a
3666  * modification to an existing empty file.  We do not check the state
3667  * of the current tree for a creation patch in this function; the caller
3668  * check_patch() separately makes sure (and errors out otherwise) that
3669  * the path the patch creates does not exist in the current tree.
3670  */
3671 static int check_preimage(struct apply_state *state,
3672                           struct patch *patch,
3673                           struct cache_entry **ce,
3674                           struct stat *st)
3675 {
3676         const char *old_name = patch->old_name;
3677         struct patch *previous = NULL;
3678         int stat_ret = 0, status;
3679         unsigned st_mode = 0;
3680
3681         if (!old_name)
3682                 return 0;
3683
3684         assert(patch->is_new <= 0);
3685         previous = previous_patch(state, patch, &status);
3686
3687         if (status)
3688                 return error(_("path %s has been renamed/deleted"), old_name);
3689         if (previous) {
3690                 st_mode = previous->new_mode;
3691         } else if (!state->cached) {
3692                 stat_ret = lstat(old_name, st);
3693                 if (stat_ret && errno != ENOENT)
3694                         return error_errno("%s", old_name);
3695         }
3696
3697         if (state->check_index && !previous) {
3698                 int pos = index_name_pos(state->repo->index, old_name,
3699                                          strlen(old_name));
3700                 if (pos < 0) {
3701                         if (patch->is_new < 0)
3702                                 goto is_new;
3703                         return error(_("%s: does not exist in index"), old_name);
3704                 }
3705                 *ce = state->repo->index->cache[pos];
3706                 if (stat_ret < 0) {
3707                         if (checkout_target(state->repo->index, *ce, st))
3708                                 return -1;
3709                 }
3710                 if (!state->cached && verify_index_match(state, *ce, st))
3711                         return error(_("%s: does not match index"), old_name);
3712                 if (state->cached)
3713                         st_mode = (*ce)->ce_mode;
3714         } else if (stat_ret < 0) {
3715                 if (patch->is_new < 0)
3716                         goto is_new;
3717                 return error_errno("%s", old_name);
3718         }
3719
3720         if (!state->cached && !previous)
3721                 st_mode = ce_mode_from_stat(*ce, st->st_mode);
3722
3723         if (patch->is_new < 0)
3724                 patch->is_new = 0;
3725         if (!patch->old_mode)
3726                 patch->old_mode = st_mode;
3727         if ((st_mode ^ patch->old_mode) & S_IFMT)
3728                 return error(_("%s: wrong type"), old_name);
3729         if (st_mode != patch->old_mode)
3730                 warning(_("%s has type %o, expected %o"),
3731                         old_name, st_mode, patch->old_mode);
3732         if (!patch->new_mode && !patch->is_delete)
3733                 patch->new_mode = st_mode;
3734         return 0;
3735
3736  is_new:
3737         patch->is_new = 1;
3738         patch->is_delete = 0;
3739         FREE_AND_NULL(patch->old_name);
3740         return 0;
3741 }
3742
3743
3744 #define EXISTS_IN_INDEX 1
3745 #define EXISTS_IN_WORKTREE 2
3746
3747 static int check_to_create(struct apply_state *state,
3748                            const char *new_name,
3749                            int ok_if_exists)
3750 {
3751         struct stat nst;
3752
3753         if (state->check_index &&
3754             index_name_pos(state->repo->index, new_name, strlen(new_name)) >= 0 &&
3755             !ok_if_exists)
3756                 return EXISTS_IN_INDEX;
3757         if (state->cached)
3758                 return 0;
3759
3760         if (!lstat(new_name, &nst)) {
3761                 if (S_ISDIR(nst.st_mode) || ok_if_exists)
3762                         return 0;
3763                 /*
3764                  * A leading component of new_name might be a symlink
3765                  * that is going to be removed with this patch, but
3766                  * still pointing at somewhere that has the path.
3767                  * In such a case, path "new_name" does not exist as
3768                  * far as git is concerned.
3769                  */
3770                 if (has_symlink_leading_path(new_name, strlen(new_name)))
3771                         return 0;
3772
3773                 return EXISTS_IN_WORKTREE;
3774         } else if (!is_missing_file_error(errno)) {
3775                 return error_errno("%s", new_name);
3776         }
3777         return 0;
3778 }
3779
3780 static uintptr_t register_symlink_changes(struct apply_state *state,
3781                                           const char *path,
3782                                           uintptr_t what)
3783 {
3784         struct string_list_item *ent;
3785
3786         ent = string_list_lookup(&state->symlink_changes, path);
3787         if (!ent) {
3788                 ent = string_list_insert(&state->symlink_changes, path);
3789                 ent->util = (void *)0;
3790         }
3791         ent->util = (void *)(what | ((uintptr_t)ent->util));
3792         return (uintptr_t)ent->util;
3793 }
3794
3795 static uintptr_t check_symlink_changes(struct apply_state *state, const char *path)
3796 {
3797         struct string_list_item *ent;
3798
3799         ent = string_list_lookup(&state->symlink_changes, path);
3800         if (!ent)
3801                 return 0;
3802         return (uintptr_t)ent->util;
3803 }
3804
3805 static void prepare_symlink_changes(struct apply_state *state, struct patch *patch)
3806 {
3807         for ( ; patch; patch = patch->next) {
3808                 if ((patch->old_name && S_ISLNK(patch->old_mode)) &&
3809                     (patch->is_rename || patch->is_delete))
3810                         /* the symlink at patch->old_name is removed */
3811                         register_symlink_changes(state, patch->old_name, APPLY_SYMLINK_GOES_AWAY);
3812
3813                 if (patch->new_name && S_ISLNK(patch->new_mode))
3814                         /* the symlink at patch->new_name is created or remains */
3815                         register_symlink_changes(state, patch->new_name, APPLY_SYMLINK_IN_RESULT);
3816         }
3817 }
3818
3819 static int path_is_beyond_symlink_1(struct apply_state *state, struct strbuf *name)
3820 {
3821         do {
3822                 unsigned int change;
3823
3824                 while (--name->len && name->buf[name->len] != '/')
3825                         ; /* scan backwards */
3826                 if (!name->len)
3827                         break;
3828                 name->buf[name->len] = '\0';
3829                 change = check_symlink_changes(state, name->buf);
3830                 if (change & APPLY_SYMLINK_IN_RESULT)
3831                         return 1;
3832                 if (change & APPLY_SYMLINK_GOES_AWAY)
3833                         /*
3834                          * This cannot be "return 0", because we may
3835                          * see a new one created at a higher level.
3836                          */
3837                         continue;
3838
3839                 /* otherwise, check the preimage */
3840                 if (state->check_index) {
3841                         struct cache_entry *ce;
3842
3843                         ce = index_file_exists(state->repo->index, name->buf,
3844                                                name->len, ignore_case);
3845                         if (ce && S_ISLNK(ce->ce_mode))
3846                                 return 1;
3847                 } else {
3848                         struct stat st;
3849                         if (!lstat(name->buf, &st) && S_ISLNK(st.st_mode))
3850                                 return 1;
3851                 }
3852         } while (1);
3853         return 0;
3854 }
3855
3856 static int path_is_beyond_symlink(struct apply_state *state, const char *name_)
3857 {
3858         int ret;
3859         struct strbuf name = STRBUF_INIT;
3860
3861         assert(*name_ != '\0');
3862         strbuf_addstr(&name, name_);
3863         ret = path_is_beyond_symlink_1(state, &name);
3864         strbuf_release(&name);
3865
3866         return ret;
3867 }
3868
3869 static int check_unsafe_path(struct patch *patch)
3870 {
3871         const char *old_name = NULL;
3872         const char *new_name = NULL;
3873         if (patch->is_delete)
3874                 old_name = patch->old_name;
3875         else if (!patch->is_new && !patch->is_copy)
3876                 old_name = patch->old_name;
3877         if (!patch->is_delete)
3878                 new_name = patch->new_name;
3879
3880         if (old_name && !verify_path(old_name, patch->old_mode))
3881                 return error(_("invalid path '%s'"), old_name);
3882         if (new_name && !verify_path(new_name, patch->new_mode))
3883                 return error(_("invalid path '%s'"), new_name);
3884         return 0;
3885 }
3886
3887 /*
3888  * Check and apply the patch in-core; leave the result in patch->result
3889  * for the caller to write it out to the final destination.
3890  */
3891 static int check_patch(struct apply_state *state, struct patch *patch)
3892 {
3893         struct stat st;
3894         const char *old_name = patch->old_name;
3895         const char *new_name = patch->new_name;
3896         const char *name = old_name ? old_name : new_name;
3897         struct cache_entry *ce = NULL;
3898         struct patch *tpatch;
3899         int ok_if_exists;
3900         int status;
3901
3902         patch->rejected = 1; /* we will drop this after we succeed */
3903
3904         status = check_preimage(state, patch, &ce, &st);
3905         if (status)
3906                 return status;
3907         old_name = patch->old_name;
3908
3909         /*
3910          * A type-change diff is always split into a patch to delete
3911          * old, immediately followed by a patch to create new (see
3912          * diff.c::run_diff()); in such a case it is Ok that the entry
3913          * to be deleted by the previous patch is still in the working
3914          * tree and in the index.
3915          *
3916          * A patch to swap-rename between A and B would first rename A
3917          * to B and then rename B to A.  While applying the first one,
3918          * the presence of B should not stop A from getting renamed to
3919          * B; ask to_be_deleted() about the later rename.  Removal of
3920          * B and rename from A to B is handled the same way by asking
3921          * was_deleted().
3922          */
3923         if ((tpatch = in_fn_table(state, new_name)) &&
3924             (was_deleted(tpatch) || to_be_deleted(tpatch)))
3925                 ok_if_exists = 1;
3926         else
3927                 ok_if_exists = 0;
3928
3929         if (new_name &&
3930             ((0 < patch->is_new) || patch->is_rename || patch->is_copy)) {
3931                 int err = check_to_create(state, new_name, ok_if_exists);
3932
3933                 if (err && state->threeway) {
3934                         patch->direct_to_threeway = 1;
3935                 } else switch (err) {
3936                 case 0:
3937                         break; /* happy */
3938                 case EXISTS_IN_INDEX:
3939                         return error(_("%s: already exists in index"), new_name);
3940                         break;
3941                 case EXISTS_IN_WORKTREE:
3942                         return error(_("%s: already exists in working directory"),
3943                                      new_name);
3944                 default:
3945                         return err;
3946                 }
3947
3948                 if (!patch->new_mode) {
3949                         if (0 < patch->is_new)
3950                                 patch->new_mode = S_IFREG | 0644;
3951                         else
3952                                 patch->new_mode = patch->old_mode;
3953                 }
3954         }
3955
3956         if (new_name && old_name) {
3957                 int same = !strcmp(old_name, new_name);
3958                 if (!patch->new_mode)
3959                         patch->new_mode = patch->old_mode;
3960                 if ((patch->old_mode ^ patch->new_mode) & S_IFMT) {
3961                         if (same)
3962                                 return error(_("new mode (%o) of %s does not "
3963                                                "match old mode (%o)"),
3964                                         patch->new_mode, new_name,
3965                                         patch->old_mode);
3966                         else
3967                                 return error(_("new mode (%o) of %s does not "
3968                                                "match old mode (%o) of %s"),
3969                                         patch->new_mode, new_name,
3970                                         patch->old_mode, old_name);
3971                 }
3972         }
3973
3974         if (!state->unsafe_paths && check_unsafe_path(patch))
3975                 return -128;
3976
3977         /*
3978          * An attempt to read from or delete a path that is beyond a
3979          * symbolic link will be prevented by load_patch_target() that
3980          * is called at the beginning of apply_data() so we do not
3981          * have to worry about a patch marked with "is_delete" bit
3982          * here.  We however need to make sure that the patch result
3983          * is not deposited to a path that is beyond a symbolic link
3984          * here.
3985          */
3986         if (!patch->is_delete && path_is_beyond_symlink(state, patch->new_name))
3987                 return error(_("affected file '%s' is beyond a symbolic link"),
3988                              patch->new_name);
3989
3990         if (apply_data(state, patch, &st, ce) < 0)
3991                 return error(_("%s: patch does not apply"), name);
3992         patch->rejected = 0;
3993         return 0;
3994 }
3995
3996 static int check_patch_list(struct apply_state *state, struct patch *patch)
3997 {
3998         int err = 0;
3999
4000         prepare_symlink_changes(state, patch);
4001         prepare_fn_table(state, patch);
4002         while (patch) {
4003                 int res;
4004                 if (state->apply_verbosity > verbosity_normal)
4005                         say_patch_name(stderr,
4006                                        _("Checking patch %s..."), patch);
4007                 res = check_patch(state, patch);
4008                 if (res == -128)
4009                         return -128;
4010                 err |= res;
4011                 patch = patch->next;
4012         }
4013         return err;
4014 }
4015
4016 static int read_apply_cache(struct apply_state *state)
4017 {
4018         if (state->index_file)
4019                 return read_index_from(state->repo->index, state->index_file,
4020                                        get_git_dir());
4021         else
4022                 return read_index(state->repo->index);
4023 }
4024
4025 /* This function tries to read the object name from the current index */
4026 static int get_current_oid(struct apply_state *state, const char *path,
4027                            struct object_id *oid)
4028 {
4029         int pos;
4030
4031         if (read_apply_cache(state) < 0)
4032                 return -1;
4033         pos = index_name_pos(state->repo->index, path, strlen(path));
4034         if (pos < 0)
4035                 return -1;
4036         oidcpy(oid, &state->repo->index->cache[pos]->oid);
4037         return 0;
4038 }
4039
4040 static int preimage_oid_in_gitlink_patch(struct patch *p, struct object_id *oid)
4041 {
4042         /*
4043          * A usable gitlink patch has only one fragment (hunk) that looks like:
4044          * @@ -1 +1 @@
4045          * -Subproject commit <old sha1>
4046          * +Subproject commit <new sha1>
4047          * or
4048          * @@ -1 +0,0 @@
4049          * -Subproject commit <old sha1>
4050          * for a removal patch.
4051          */
4052         struct fragment *hunk = p->fragments;
4053         static const char heading[] = "-Subproject commit ";
4054         char *preimage;
4055
4056         if (/* does the patch have only one hunk? */
4057             hunk && !hunk->next &&
4058             /* is its preimage one line? */
4059             hunk->oldpos == 1 && hunk->oldlines == 1 &&
4060             /* does preimage begin with the heading? */
4061             (preimage = memchr(hunk->patch, '\n', hunk->size)) != NULL &&
4062             starts_with(++preimage, heading) &&
4063             /* does it record full SHA-1? */
4064             !get_oid_hex(preimage + sizeof(heading) - 1, oid) &&
4065             preimage[sizeof(heading) + the_hash_algo->hexsz - 1] == '\n' &&
4066             /* does the abbreviated name on the index line agree with it? */
4067             starts_with(preimage + sizeof(heading) - 1, p->old_oid_prefix))
4068                 return 0; /* it all looks fine */
4069
4070         /* we may have full object name on the index line */
4071         return get_oid_hex(p->old_oid_prefix, oid);
4072 }
4073
4074 /* Build an index that contains just the files needed for a 3way merge */
4075 static int build_fake_ancestor(struct apply_state *state, struct patch *list)
4076 {
4077         struct patch *patch;
4078         struct index_state result = { NULL };
4079         struct lock_file lock = LOCK_INIT;
4080         int res;
4081
4082         /* Once we start supporting the reverse patch, it may be
4083          * worth showing the new sha1 prefix, but until then...
4084          */
4085         for (patch = list; patch; patch = patch->next) {
4086                 struct object_id oid;
4087                 struct cache_entry *ce;
4088                 const char *name;
4089
4090                 name = patch->old_name ? patch->old_name : patch->new_name;
4091                 if (0 < patch->is_new)
4092                         continue;
4093
4094                 if (S_ISGITLINK(patch->old_mode)) {
4095                         if (!preimage_oid_in_gitlink_patch(patch, &oid))
4096                                 ; /* ok, the textual part looks sane */
4097                         else
4098                                 return error(_("sha1 information is lacking or "
4099                                                "useless for submodule %s"), name);
4100                 } else if (!get_oid_blob(patch->old_oid_prefix, &oid)) {
4101                         ; /* ok */
4102                 } else if (!patch->lines_added && !patch->lines_deleted) {
4103                         /* mode-only change: update the current */
4104                         if (get_current_oid(state, patch->old_name, &oid))
4105                                 return error(_("mode change for %s, which is not "
4106                                                "in current HEAD"), name);
4107                 } else
4108                         return error(_("sha1 information is lacking or useless "
4109                                        "(%s)."), name);
4110
4111                 ce = make_cache_entry(&result, patch->old_mode, &oid, name, 0, 0);
4112                 if (!ce)
4113                         return error(_("make_cache_entry failed for path '%s'"),
4114                                      name);
4115                 if (add_index_entry(&result, ce, ADD_CACHE_OK_TO_ADD)) {
4116                         discard_cache_entry(ce);
4117                         return error(_("could not add %s to temporary index"),
4118                                      name);
4119                 }
4120         }
4121
4122         hold_lock_file_for_update(&lock, state->fake_ancestor, LOCK_DIE_ON_ERROR);
4123         res = write_locked_index(&result, &lock, COMMIT_LOCK);
4124         discard_index(&result);
4125
4126         if (res)
4127                 return error(_("could not write temporary index to %s"),
4128                              state->fake_ancestor);
4129
4130         return 0;
4131 }
4132
4133 static void stat_patch_list(struct apply_state *state, struct patch *patch)
4134 {
4135         int files, adds, dels;
4136
4137         for (files = adds = dels = 0 ; patch ; patch = patch->next) {
4138                 files++;
4139                 adds += patch->lines_added;
4140                 dels += patch->lines_deleted;
4141                 show_stats(state, patch);
4142         }
4143
4144         print_stat_summary(stdout, files, adds, dels);
4145 }
4146
4147 static void numstat_patch_list(struct apply_state *state,
4148                                struct patch *patch)
4149 {
4150         for ( ; patch; patch = patch->next) {
4151                 const char *name;
4152                 name = patch->new_name ? patch->new_name : patch->old_name;
4153                 if (patch->is_binary)
4154                         printf("-\t-\t");
4155                 else
4156                         printf("%d\t%d\t", patch->lines_added, patch->lines_deleted);
4157                 write_name_quoted(name, stdout, state->line_termination);
4158         }
4159 }
4160
4161 static void show_file_mode_name(const char *newdelete, unsigned int mode, const char *name)
4162 {
4163         if (mode)
4164                 printf(" %s mode %06o %s\n", newdelete, mode, name);
4165         else
4166                 printf(" %s %s\n", newdelete, name);
4167 }
4168
4169 static void show_mode_change(struct patch *p, int show_name)
4170 {
4171         if (p->old_mode && p->new_mode && p->old_mode != p->new_mode) {
4172                 if (show_name)
4173                         printf(" mode change %06o => %06o %s\n",
4174                                p->old_mode, p->new_mode, p->new_name);
4175                 else
4176                         printf(" mode change %06o => %06o\n",
4177                                p->old_mode, p->new_mode);
4178         }
4179 }
4180
4181 static void show_rename_copy(struct patch *p)
4182 {
4183         const char *renamecopy = p->is_rename ? "rename" : "copy";
4184         const char *old_name, *new_name;
4185
4186         /* Find common prefix */
4187         old_name = p->old_name;
4188         new_name = p->new_name;
4189         while (1) {
4190                 const char *slash_old, *slash_new;
4191                 slash_old = strchr(old_name, '/');
4192                 slash_new = strchr(new_name, '/');
4193                 if (!slash_old ||
4194                     !slash_new ||
4195                     slash_old - old_name != slash_new - new_name ||
4196                     memcmp(old_name, new_name, slash_new - new_name))
4197                         break;
4198                 old_name = slash_old + 1;
4199                 new_name = slash_new + 1;
4200         }
4201         /* p->old_name thru old_name is the common prefix, and old_name and new_name
4202          * through the end of names are renames
4203          */
4204         if (old_name != p->old_name)
4205                 printf(" %s %.*s{%s => %s} (%d%%)\n", renamecopy,
4206                        (int)(old_name - p->old_name), p->old_name,
4207                        old_name, new_name, p->score);
4208         else
4209                 printf(" %s %s => %s (%d%%)\n", renamecopy,
4210                        p->old_name, p->new_name, p->score);
4211         show_mode_change(p, 0);
4212 }
4213
4214 static void summary_patch_list(struct patch *patch)
4215 {
4216         struct patch *p;
4217
4218         for (p = patch; p; p = p->next) {
4219                 if (p->is_new)
4220                         show_file_mode_name("create", p->new_mode, p->new_name);
4221                 else if (p->is_delete)
4222                         show_file_mode_name("delete", p->old_mode, p->old_name);
4223                 else {
4224                         if (p->is_rename || p->is_copy)
4225                                 show_rename_copy(p);
4226                         else {
4227                                 if (p->score) {
4228                                         printf(" rewrite %s (%d%%)\n",
4229                                                p->new_name, p->score);
4230                                         show_mode_change(p, 0);
4231                                 }
4232                                 else
4233                                         show_mode_change(p, 1);
4234                         }
4235                 }
4236         }
4237 }
4238
4239 static void patch_stats(struct apply_state *state, struct patch *patch)
4240 {
4241         int lines = patch->lines_added + patch->lines_deleted;
4242
4243         if (lines > state->max_change)
4244                 state->max_change = lines;
4245         if (patch->old_name) {
4246                 int len = quote_c_style(patch->old_name, NULL, NULL, 0);
4247                 if (!len)
4248                         len = strlen(patch->old_name);
4249                 if (len > state->max_len)
4250                         state->max_len = len;
4251         }
4252         if (patch->new_name) {
4253                 int len = quote_c_style(patch->new_name, NULL, NULL, 0);
4254                 if (!len)
4255                         len = strlen(patch->new_name);
4256                 if (len > state->max_len)
4257                         state->max_len = len;
4258         }
4259 }
4260
4261 static int remove_file(struct apply_state *state, struct patch *patch, int rmdir_empty)
4262 {
4263         if (state->update_index && !state->ita_only) {
4264                 if (remove_file_from_index(state->repo->index, patch->old_name) < 0)
4265                         return error(_("unable to remove %s from index"), patch->old_name);
4266         }
4267         if (!state->cached) {
4268                 if (!remove_or_warn(patch->old_mode, patch->old_name) && rmdir_empty) {
4269                         remove_path(patch->old_name);
4270                 }
4271         }
4272         return 0;
4273 }
4274
4275 static int add_index_file(struct apply_state *state,
4276                           const char *path,
4277                           unsigned mode,
4278                           void *buf,
4279                           unsigned long size)
4280 {
4281         struct stat st;
4282         struct cache_entry *ce;
4283         int namelen = strlen(path);
4284
4285         ce = make_empty_cache_entry(state->repo->index, namelen);
4286         memcpy(ce->name, path, namelen);
4287         ce->ce_mode = create_ce_mode(mode);
4288         ce->ce_flags = create_ce_flags(0);
4289         ce->ce_namelen = namelen;
4290         if (state->ita_only) {
4291                 ce->ce_flags |= CE_INTENT_TO_ADD;
4292                 set_object_name_for_intent_to_add_entry(ce);
4293         } else if (S_ISGITLINK(mode)) {
4294                 const char *s;
4295
4296                 if (!skip_prefix(buf, "Subproject commit ", &s) ||
4297                     get_oid_hex(s, &ce->oid)) {
4298                         discard_cache_entry(ce);
4299                         return error(_("corrupt patch for submodule %s"), path);
4300                 }
4301         } else {
4302                 if (!state->cached) {
4303                         if (lstat(path, &st) < 0) {
4304                                 discard_cache_entry(ce);
4305                                 return error_errno(_("unable to stat newly "
4306                                                      "created file '%s'"),
4307                                                    path);
4308                         }
4309                         fill_stat_cache_info(ce, &st);
4310                 }
4311                 if (write_object_file(buf, size, blob_type, &ce->oid) < 0) {
4312                         discard_cache_entry(ce);
4313                         return error(_("unable to create backing store "
4314                                        "for newly created file %s"), path);
4315                 }
4316         }
4317         if (add_index_entry(state->repo->index, ce, ADD_CACHE_OK_TO_ADD) < 0) {
4318                 discard_cache_entry(ce);
4319                 return error(_("unable to add cache entry for %s"), path);
4320         }
4321
4322         return 0;
4323 }
4324
4325 /*
4326  * Returns:
4327  *  -1 if an unrecoverable error happened
4328  *   0 if everything went well
4329  *   1 if a recoverable error happened
4330  */
4331 static int try_create_file(struct apply_state *state, const char *path,
4332                            unsigned int mode, const char *buf,
4333                            unsigned long size)
4334 {
4335         int fd, res;
4336         struct strbuf nbuf = STRBUF_INIT;
4337
4338         if (S_ISGITLINK(mode)) {
4339                 struct stat st;
4340                 if (!lstat(path, &st) && S_ISDIR(st.st_mode))
4341                         return 0;
4342                 return !!mkdir(path, 0777);
4343         }
4344
4345         if (has_symlinks && S_ISLNK(mode))
4346                 /* Although buf:size is counted string, it also is NUL
4347                  * terminated.
4348                  */
4349                 return !!symlink(buf, path);
4350
4351         fd = open(path, O_CREAT | O_EXCL | O_WRONLY, (mode & 0100) ? 0777 : 0666);
4352         if (fd < 0)
4353                 return 1;
4354
4355         if (convert_to_working_tree(state->repo->index, path, buf, size, &nbuf)) {
4356                 size = nbuf.len;
4357                 buf  = nbuf.buf;
4358         }
4359
4360         res = write_in_full(fd, buf, size) < 0;
4361         if (res)
4362                 error_errno(_("failed to write to '%s'"), path);
4363         strbuf_release(&nbuf);
4364
4365         if (close(fd) < 0 && !res)
4366                 return error_errno(_("closing file '%s'"), path);
4367
4368         return res ? -1 : 0;
4369 }
4370
4371 /*
4372  * We optimistically assume that the directories exist,
4373  * which is true 99% of the time anyway. If they don't,
4374  * we create them and try again.
4375  *
4376  * Returns:
4377  *   -1 on error
4378  *   0 otherwise
4379  */
4380 static int create_one_file(struct apply_state *state,
4381                            char *path,
4382                            unsigned mode,
4383                            const char *buf,
4384                            unsigned long size)
4385 {
4386         int res;
4387
4388         if (state->cached)
4389                 return 0;
4390
4391         res = try_create_file(state, path, mode, buf, size);
4392         if (res < 0)
4393                 return -1;
4394         if (!res)
4395                 return 0;
4396
4397         if (errno == ENOENT) {
4398                 if (safe_create_leading_directories(path))
4399                         return 0;
4400                 res = try_create_file(state, path, mode, buf, size);
4401                 if (res < 0)
4402                         return -1;
4403                 if (!res)
4404                         return 0;
4405         }
4406
4407         if (errno == EEXIST || errno == EACCES) {
4408                 /* We may be trying to create a file where a directory
4409                  * used to be.
4410                  */
4411                 struct stat st;
4412                 if (!lstat(path, &st) && (!S_ISDIR(st.st_mode) || !rmdir(path)))
4413                         errno = EEXIST;
4414         }
4415
4416         if (errno == EEXIST) {
4417                 unsigned int nr = getpid();
4418
4419                 for (;;) {
4420                         char newpath[PATH_MAX];
4421                         mksnpath(newpath, sizeof(newpath), "%s~%u", path, nr);
4422                         res = try_create_file(state, newpath, mode, buf, size);
4423                         if (res < 0)
4424                                 return -1;
4425                         if (!res) {
4426                                 if (!rename(newpath, path))
4427                                         return 0;
4428                                 unlink_or_warn(newpath);
4429                                 break;
4430                         }
4431                         if (errno != EEXIST)
4432                                 break;
4433                         ++nr;
4434                 }
4435         }
4436         return error_errno(_("unable to write file '%s' mode %o"),
4437                            path, mode);
4438 }
4439
4440 static int add_conflicted_stages_file(struct apply_state *state,
4441                                        struct patch *patch)
4442 {
4443         int stage, namelen;
4444         unsigned mode;
4445         struct cache_entry *ce;
4446
4447         if (!state->update_index)
4448                 return 0;
4449         namelen = strlen(patch->new_name);
4450         mode = patch->new_mode ? patch->new_mode : (S_IFREG | 0644);
4451
4452         remove_file_from_index(state->repo->index, patch->new_name);
4453         for (stage = 1; stage < 4; stage++) {
4454                 if (is_null_oid(&patch->threeway_stage[stage - 1]))
4455                         continue;
4456                 ce = make_empty_cache_entry(state->repo->index, namelen);
4457                 memcpy(ce->name, patch->new_name, namelen);
4458                 ce->ce_mode = create_ce_mode(mode);
4459                 ce->ce_flags = create_ce_flags(stage);
4460                 ce->ce_namelen = namelen;
4461                 oidcpy(&ce->oid, &patch->threeway_stage[stage - 1]);
4462                 if (add_index_entry(state->repo->index, ce, ADD_CACHE_OK_TO_ADD) < 0) {
4463                         discard_cache_entry(ce);
4464                         return error(_("unable to add cache entry for %s"),
4465                                      patch->new_name);
4466                 }
4467         }
4468
4469         return 0;
4470 }
4471
4472 static int create_file(struct apply_state *state, struct patch *patch)
4473 {
4474         char *path = patch->new_name;
4475         unsigned mode = patch->new_mode;
4476         unsigned long size = patch->resultsize;
4477         char *buf = patch->result;
4478
4479         if (!mode)
4480                 mode = S_IFREG | 0644;
4481         if (create_one_file(state, path, mode, buf, size))
4482                 return -1;
4483
4484         if (patch->conflicted_threeway)
4485                 return add_conflicted_stages_file(state, patch);
4486         else if (state->update_index)
4487                 return add_index_file(state, path, mode, buf, size);
4488         return 0;
4489 }
4490
4491 /* phase zero is to remove, phase one is to create */
4492 static int write_out_one_result(struct apply_state *state,
4493                                 struct patch *patch,
4494                                 int phase)
4495 {
4496         if (patch->is_delete > 0) {
4497                 if (phase == 0)
4498                         return remove_file(state, patch, 1);
4499                 return 0;
4500         }
4501         if (patch->is_new > 0 || patch->is_copy) {
4502                 if (phase == 1)
4503                         return create_file(state, patch);
4504                 return 0;
4505         }
4506         /*
4507          * Rename or modification boils down to the same
4508          * thing: remove the old, write the new
4509          */
4510         if (phase == 0)
4511                 return remove_file(state, patch, patch->is_rename);
4512         if (phase == 1)
4513                 return create_file(state, patch);
4514         return 0;
4515 }
4516
4517 static int write_out_one_reject(struct apply_state *state, struct patch *patch)
4518 {
4519         FILE *rej;
4520         char namebuf[PATH_MAX];
4521         struct fragment *frag;
4522         int cnt = 0;
4523         struct strbuf sb = STRBUF_INIT;
4524
4525         for (cnt = 0, frag = patch->fragments; frag; frag = frag->next) {
4526                 if (!frag->rejected)
4527                         continue;
4528                 cnt++;
4529         }
4530
4531         if (!cnt) {
4532                 if (state->apply_verbosity > verbosity_normal)
4533                         say_patch_name(stderr,
4534                                        _("Applied patch %s cleanly."), patch);
4535                 return 0;
4536         }
4537
4538         /* This should not happen, because a removal patch that leaves
4539          * contents are marked "rejected" at the patch level.
4540          */
4541         if (!patch->new_name)
4542                 die(_("internal error"));
4543
4544         /* Say this even without --verbose */
4545         strbuf_addf(&sb, Q_("Applying patch %%s with %d reject...",
4546                             "Applying patch %%s with %d rejects...",
4547                             cnt),
4548                     cnt);
4549         if (state->apply_verbosity > verbosity_silent)
4550                 say_patch_name(stderr, sb.buf, patch);
4551         strbuf_release(&sb);
4552
4553         cnt = strlen(patch->new_name);
4554         if (ARRAY_SIZE(namebuf) <= cnt + 5) {
4555                 cnt = ARRAY_SIZE(namebuf) - 5;
4556                 warning(_("truncating .rej filename to %.*s.rej"),
4557                         cnt - 1, patch->new_name);
4558         }
4559         memcpy(namebuf, patch->new_name, cnt);
4560         memcpy(namebuf + cnt, ".rej", 5);
4561
4562         rej = fopen(namebuf, "w");
4563         if (!rej)
4564                 return error_errno(_("cannot open %s"), namebuf);
4565
4566         /* Normal git tools never deal with .rej, so do not pretend
4567          * this is a git patch by saying --git or giving extended
4568          * headers.  While at it, maybe please "kompare" that wants
4569          * the trailing TAB and some garbage at the end of line ;-).
4570          */
4571         fprintf(rej, "diff a/%s b/%s\t(rejected hunks)\n",
4572                 patch->new_name, patch->new_name);
4573         for (cnt = 1, frag = patch->fragments;
4574              frag;
4575              cnt++, frag = frag->next) {
4576                 if (!frag->rejected) {
4577                         if (state->apply_verbosity > verbosity_silent)
4578                                 fprintf_ln(stderr, _("Hunk #%d applied cleanly."), cnt);
4579                         continue;
4580                 }
4581                 if (state->apply_verbosity > verbosity_silent)
4582                         fprintf_ln(stderr, _("Rejected hunk #%d."), cnt);
4583                 fprintf(rej, "%.*s", frag->size, frag->patch);
4584                 if (frag->patch[frag->size-1] != '\n')
4585                         fputc('\n', rej);
4586         }
4587         fclose(rej);
4588         return -1;
4589 }
4590
4591 /*
4592  * Returns:
4593  *  -1 if an error happened
4594  *   0 if the patch applied cleanly
4595  *   1 if the patch did not apply cleanly
4596  */
4597 static int write_out_results(struct apply_state *state, struct patch *list)
4598 {
4599         int phase;
4600         int errs = 0;
4601         struct patch *l;
4602         struct string_list cpath = STRING_LIST_INIT_DUP;
4603
4604         for (phase = 0; phase < 2; phase++) {
4605                 l = list;
4606                 while (l) {
4607                         if (l->rejected)
4608                                 errs = 1;
4609                         else {
4610                                 if (write_out_one_result(state, l, phase)) {
4611                                         string_list_clear(&cpath, 0);
4612                                         return -1;
4613                                 }
4614                                 if (phase == 1) {
4615                                         if (write_out_one_reject(state, l))
4616                                                 errs = 1;
4617                                         if (l->conflicted_threeway) {
4618                                                 string_list_append(&cpath, l->new_name);
4619                                                 errs = 1;
4620                                         }
4621                                 }
4622                         }
4623                         l = l->next;
4624                 }
4625         }
4626
4627         if (cpath.nr) {
4628                 struct string_list_item *item;
4629
4630                 string_list_sort(&cpath);
4631                 if (state->apply_verbosity > verbosity_silent) {
4632                         for_each_string_list_item(item, &cpath)
4633                                 fprintf(stderr, "U %s\n", item->string);
4634                 }
4635                 string_list_clear(&cpath, 0);
4636
4637                 repo_rerere(state->repo, 0);
4638         }
4639
4640         return errs;
4641 }
4642
4643 /*
4644  * Try to apply a patch.
4645  *
4646  * Returns:
4647  *  -128 if a bad error happened (like patch unreadable)
4648  *  -1 if patch did not apply and user cannot deal with it
4649  *   0 if the patch applied
4650  *   1 if the patch did not apply but user might fix it
4651  */
4652 static int apply_patch(struct apply_state *state,
4653                        int fd,
4654                        const char *filename,
4655                        int options)
4656 {
4657         size_t offset;
4658         struct strbuf buf = STRBUF_INIT; /* owns the patch text */
4659         struct patch *list = NULL, **listp = &list;
4660         int skipped_patch = 0;
4661         int res = 0;
4662
4663         state->patch_input_file = filename;
4664         if (read_patch_file(&buf, fd) < 0)
4665                 return -128;
4666         offset = 0;
4667         while (offset < buf.len) {
4668                 struct patch *patch;
4669                 int nr;
4670
4671                 patch = xcalloc(1, sizeof(*patch));
4672                 patch->inaccurate_eof = !!(options & APPLY_OPT_INACCURATE_EOF);
4673                 patch->recount =  !!(options & APPLY_OPT_RECOUNT);
4674                 nr = parse_chunk(state, buf.buf + offset, buf.len - offset, patch);
4675                 if (nr < 0) {
4676                         free_patch(patch);
4677                         if (nr == -128) {
4678                                 res = -128;
4679                                 goto end;
4680                         }
4681                         break;
4682                 }
4683                 if (state->apply_in_reverse)
4684                         reverse_patches(patch);
4685                 if (use_patch(state, patch)) {
4686                         patch_stats(state, patch);
4687                         *listp = patch;
4688                         listp = &patch->next;
4689                 }
4690                 else {
4691                         if (state->apply_verbosity > verbosity_normal)
4692                                 say_patch_name(stderr, _("Skipped patch '%s'."), patch);
4693                         free_patch(patch);
4694                         skipped_patch++;
4695                 }
4696                 offset += nr;
4697         }
4698
4699         if (!list && !skipped_patch) {
4700                 error(_("unrecognized input"));
4701                 res = -128;
4702                 goto end;
4703         }
4704
4705         if (state->whitespace_error && (state->ws_error_action == die_on_ws_error))
4706                 state->apply = 0;
4707
4708         state->update_index = (state->check_index || state->ita_only) && state->apply;
4709         if (state->update_index && !is_lock_file_locked(&state->lock_file)) {
4710                 if (state->index_file)
4711                         hold_lock_file_for_update(&state->lock_file,
4712                                                   state->index_file,
4713                                                   LOCK_DIE_ON_ERROR);
4714                 else
4715                         hold_locked_index(&state->lock_file, LOCK_DIE_ON_ERROR);
4716         }
4717
4718         if (state->check_index && read_apply_cache(state) < 0) {
4719                 error(_("unable to read index file"));
4720                 res = -128;
4721                 goto end;
4722         }
4723
4724         if (state->check || state->apply) {
4725                 int r = check_patch_list(state, list);
4726                 if (r == -128) {
4727                         res = -128;
4728                         goto end;
4729                 }
4730                 if (r < 0 && !state->apply_with_reject) {
4731                         res = -1;
4732                         goto end;
4733                 }
4734         }
4735
4736         if (state->apply) {
4737                 int write_res = write_out_results(state, list);
4738                 if (write_res < 0) {
4739                         res = -128;
4740                         goto end;
4741                 }
4742                 if (write_res > 0) {
4743                         /* with --3way, we still need to write the index out */
4744                         res = state->apply_with_reject ? -1 : 1;
4745                         goto end;
4746                 }
4747         }
4748
4749         if (state->fake_ancestor &&
4750             build_fake_ancestor(state, list)) {
4751                 res = -128;
4752                 goto end;
4753         }
4754
4755         if (state->diffstat && state->apply_verbosity > verbosity_silent)
4756                 stat_patch_list(state, list);
4757
4758         if (state->numstat && state->apply_verbosity > verbosity_silent)
4759                 numstat_patch_list(state, list);
4760
4761         if (state->summary && state->apply_verbosity > verbosity_silent)
4762                 summary_patch_list(list);
4763
4764 end:
4765         free_patch_list(list);
4766         strbuf_release(&buf);
4767         string_list_clear(&state->fn_table, 0);
4768         return res;
4769 }
4770
4771 static int apply_option_parse_exclude(const struct option *opt,
4772                                       const char *arg, int unset)
4773 {
4774         struct apply_state *state = opt->value;
4775
4776         BUG_ON_OPT_NEG(unset);
4777
4778         add_name_limit(state, arg, 1);
4779         return 0;
4780 }
4781
4782 static int apply_option_parse_include(const struct option *opt,
4783                                       const char *arg, int unset)
4784 {
4785         struct apply_state *state = opt->value;
4786
4787         BUG_ON_OPT_NEG(unset);
4788
4789         add_name_limit(state, arg, 0);
4790         state->has_include = 1;
4791         return 0;
4792 }
4793
4794 static int apply_option_parse_p(const struct option *opt,
4795                                 const char *arg,
4796                                 int unset)
4797 {
4798         struct apply_state *state = opt->value;
4799
4800         BUG_ON_OPT_NEG(unset);
4801
4802         state->p_value = atoi(arg);
4803         state->p_value_known = 1;
4804         return 0;
4805 }
4806
4807 static int apply_option_parse_space_change(const struct option *opt,
4808                                            const char *arg, int unset)
4809 {
4810         struct apply_state *state = opt->value;
4811
4812         BUG_ON_OPT_ARG(arg);
4813
4814         if (unset)
4815                 state->ws_ignore_action = ignore_ws_none;
4816         else
4817                 state->ws_ignore_action = ignore_ws_change;
4818         return 0;
4819 }
4820
4821 static int apply_option_parse_whitespace(const struct option *opt,
4822                                          const char *arg, int unset)
4823 {
4824         struct apply_state *state = opt->value;
4825
4826         BUG_ON_OPT_NEG(unset);
4827
4828         state->whitespace_option = arg;
4829         if (parse_whitespace_option(state, arg))
4830                 return -1;
4831         return 0;
4832 }
4833
4834 static int apply_option_parse_directory(const struct option *opt,
4835                                         const char *arg, int unset)
4836 {
4837         struct apply_state *state = opt->value;
4838
4839         BUG_ON_OPT_NEG(unset);
4840
4841         strbuf_reset(&state->root);
4842         strbuf_addstr(&state->root, arg);
4843         strbuf_complete(&state->root, '/');
4844         return 0;
4845 }
4846
4847 int apply_all_patches(struct apply_state *state,
4848                       int argc,
4849                       const char **argv,
4850                       int options)
4851 {
4852         int i;
4853         int res;
4854         int errs = 0;
4855         int read_stdin = 1;
4856
4857         for (i = 0; i < argc; i++) {
4858                 const char *arg = argv[i];
4859                 char *to_free = NULL;
4860                 int fd;
4861
4862                 if (!strcmp(arg, "-")) {
4863                         res = apply_patch(state, 0, "<stdin>", options);
4864                         if (res < 0)
4865                                 goto end;
4866                         errs |= res;
4867                         read_stdin = 0;
4868                         continue;
4869                 } else
4870                         arg = to_free = prefix_filename(state->prefix, arg);
4871
4872                 fd = open(arg, O_RDONLY);
4873                 if (fd < 0) {
4874                         error(_("can't open patch '%s': %s"), arg, strerror(errno));
4875                         res = -128;
4876                         free(to_free);
4877                         goto end;
4878                 }
4879                 read_stdin = 0;
4880                 set_default_whitespace_mode(state);
4881                 res = apply_patch(state, fd, arg, options);
4882                 close(fd);
4883                 free(to_free);
4884                 if (res < 0)
4885                         goto end;
4886                 errs |= res;
4887         }
4888         set_default_whitespace_mode(state);
4889         if (read_stdin) {
4890                 res = apply_patch(state, 0, "<stdin>", options);
4891                 if (res < 0)
4892                         goto end;
4893                 errs |= res;
4894         }
4895
4896         if (state->whitespace_error) {
4897                 if (state->squelch_whitespace_errors &&
4898                     state->squelch_whitespace_errors < state->whitespace_error) {
4899                         int squelched =
4900                                 state->whitespace_error - state->squelch_whitespace_errors;
4901                         warning(Q_("squelched %d whitespace error",
4902                                    "squelched %d whitespace errors",
4903                                    squelched),
4904                                 squelched);
4905                 }
4906                 if (state->ws_error_action == die_on_ws_error) {
4907                         error(Q_("%d line adds whitespace errors.",
4908                                  "%d lines add whitespace errors.",
4909                                  state->whitespace_error),
4910                               state->whitespace_error);
4911                         res = -128;
4912                         goto end;
4913                 }
4914                 if (state->applied_after_fixing_ws && state->apply)
4915                         warning(Q_("%d line applied after"
4916                                    " fixing whitespace errors.",
4917                                    "%d lines applied after"
4918                                    " fixing whitespace errors.",
4919                                    state->applied_after_fixing_ws),
4920                                 state->applied_after_fixing_ws);
4921                 else if (state->whitespace_error)
4922                         warning(Q_("%d line adds whitespace errors.",
4923                                    "%d lines add whitespace errors.",
4924                                    state->whitespace_error),
4925                                 state->whitespace_error);
4926         }
4927
4928         if (state->update_index) {
4929                 res = write_locked_index(state->repo->index, &state->lock_file, COMMIT_LOCK);
4930                 if (res) {
4931                         error(_("Unable to write new index file"));
4932                         res = -128;
4933                         goto end;
4934                 }
4935         }
4936
4937         res = !!errs;
4938
4939 end:
4940         rollback_lock_file(&state->lock_file);
4941
4942         if (state->apply_verbosity <= verbosity_silent) {
4943                 set_error_routine(state->saved_error_routine);
4944                 set_warn_routine(state->saved_warn_routine);
4945         }
4946
4947         if (res > -1)
4948                 return res;
4949         return (res == -1 ? 1 : 128);
4950 }
4951
4952 int apply_parse_options(int argc, const char **argv,
4953                         struct apply_state *state,
4954                         int *force_apply, int *options,
4955                         const char * const *apply_usage)
4956 {
4957         struct option builtin_apply_options[] = {
4958                 { OPTION_CALLBACK, 0, "exclude", state, N_("path"),
4959                         N_("don't apply changes matching the given path"),
4960                         PARSE_OPT_NONEG, apply_option_parse_exclude },
4961                 { OPTION_CALLBACK, 0, "include", state, N_("path"),
4962                         N_("apply changes matching the given path"),
4963                         PARSE_OPT_NONEG, apply_option_parse_include },
4964                 { OPTION_CALLBACK, 'p', NULL, state, N_("num"),
4965                         N_("remove <num> leading slashes from traditional diff paths"),
4966                         0, apply_option_parse_p },
4967                 OPT_BOOL(0, "no-add", &state->no_add,
4968                         N_("ignore additions made by the patch")),
4969                 OPT_BOOL(0, "stat", &state->diffstat,
4970                         N_("instead of applying the patch, output diffstat for the input")),
4971                 OPT_NOOP_NOARG(0, "allow-binary-replacement"),
4972                 OPT_NOOP_NOARG(0, "binary"),
4973                 OPT_BOOL(0, "numstat", &state->numstat,
4974                         N_("show number of added and deleted lines in decimal notation")),
4975                 OPT_BOOL(0, "summary", &state->summary,
4976                         N_("instead of applying the patch, output a summary for the input")),
4977                 OPT_BOOL(0, "check", &state->check,
4978                         N_("instead of applying the patch, see if the patch is applicable")),
4979                 OPT_BOOL(0, "index", &state->check_index,
4980                         N_("make sure the patch is applicable to the current index")),
4981                 OPT_BOOL('N', "intent-to-add", &state->ita_only,
4982                         N_("mark new files with `git add --intent-to-add`")),
4983                 OPT_BOOL(0, "cached", &state->cached,
4984                         N_("apply a patch without touching the working tree")),
4985                 OPT_BOOL_F(0, "unsafe-paths", &state->unsafe_paths,
4986                            N_("accept a patch that touches outside the working area"),
4987                            PARSE_OPT_NOCOMPLETE),
4988                 OPT_BOOL(0, "apply", force_apply,
4989                         N_("also apply the patch (use with --stat/--summary/--check)")),
4990                 OPT_BOOL('3', "3way", &state->threeway,
4991                          N_( "attempt three-way merge if a patch does not apply")),
4992                 OPT_FILENAME(0, "build-fake-ancestor", &state->fake_ancestor,
4993                         N_("build a temporary index based on embedded index information")),
4994                 /* Think twice before adding "--nul" synonym to this */
4995                 OPT_SET_INT('z', NULL, &state->line_termination,
4996                         N_("paths are separated with NUL character"), '\0'),
4997                 OPT_INTEGER('C', NULL, &state->p_context,
4998                                 N_("ensure at least <n> lines of context match")),
4999                 { OPTION_CALLBACK, 0, "whitespace", state, N_("action"),
5000                         N_("detect new or modified lines that have whitespace errors"),
5001                         0, apply_option_parse_whitespace },
5002                 { OPTION_CALLBACK, 0, "ignore-space-change", state, NULL,
5003                         N_("ignore changes in whitespace when finding context"),
5004                         PARSE_OPT_NOARG, apply_option_parse_space_change },
5005                 { OPTION_CALLBACK, 0, "ignore-whitespace", state, NULL,
5006                         N_("ignore changes in whitespace when finding context"),
5007                         PARSE_OPT_NOARG, apply_option_parse_space_change },
5008                 OPT_BOOL('R', "reverse", &state->apply_in_reverse,
5009                         N_("apply the patch in reverse")),
5010                 OPT_BOOL(0, "unidiff-zero", &state->unidiff_zero,
5011                         N_("don't expect at least one line of context")),
5012                 OPT_BOOL(0, "reject", &state->apply_with_reject,
5013                         N_("leave the rejected hunks in corresponding *.rej files")),
5014                 OPT_BOOL(0, "allow-overlap", &state->allow_overlap,
5015                         N_("allow overlapping hunks")),
5016                 OPT__VERBOSE(&state->apply_verbosity, N_("be verbose")),
5017                 OPT_BIT(0, "inaccurate-eof", options,
5018                         N_("tolerate incorrectly detected missing new-line at the end of file"),
5019                         APPLY_OPT_INACCURATE_EOF),
5020                 OPT_BIT(0, "recount", options,
5021                         N_("do not trust the line counts in the hunk headers"),
5022                         APPLY_OPT_RECOUNT),
5023                 { OPTION_CALLBACK, 0, "directory", state, N_("root"),
5024                         N_("prepend <root> to all filenames"),
5025                         0, apply_option_parse_directory },
5026                 OPT_END()
5027         };
5028
5029         return parse_options(argc, argv, state->prefix, builtin_apply_options, apply_usage, 0);
5030 }