1 #include "git-compat-util.h"
5 /* This code is originally from http://www.cl.cam.ac.uk/~mgk25/ucs/ */
12 size_t display_mode_esc_sequence_len(const char *s)
19 while (isdigit(*p) || *p == ';')
26 /* auxiliary function for binary search in interval table */
27 static int bisearch(ucs_char_t ucs, const struct interval *table, int max)
32 if (ucs < table[0].first || ucs > table[max].last)
35 mid = (min + max) / 2;
36 if (ucs > table[mid].last)
38 else if (ucs < table[mid].first)
47 /* The following two functions define the column width of an ISO 10646
48 * character as follows:
50 * - The null character (U+0000) has a column width of 0.
52 * - Other C0/C1 control characters and DEL will lead to a return
55 * - Non-spacing and enclosing combining characters (general
56 * category code Mn or Me in the Unicode database) have a
59 * - SOFT HYPHEN (U+00AD) has a column width of 1.
61 * - Other format characters (general category code Cf in the Unicode
62 * database) and ZERO WIDTH SPACE (U+200B) have a column width of 0.
64 * - Hangul Jamo medial vowels and final consonants (U+1160-U+11FF)
65 * have a column width of 0.
67 * - Spacing characters in the East Asian Wide (W) or East Asian
68 * Full-width (F) category as defined in Unicode Technical
69 * Report #11 have a column width of 2.
71 * - All remaining characters (including all printable
72 * ISO 8859-1 and WGL4 characters, Unicode control characters,
73 * etc.) have a column width of 1.
75 * This implementation assumes that ucs_char_t characters are encoded
79 static int git_wcwidth(ucs_char_t ch)
82 * Sorted list of non-overlapping intervals of non-spacing characters,
84 #include "unicode_width.h"
86 /* test for 8-bit control characters */
89 if (ch < 32 || (ch >= 0x7f && ch < 0xa0))
92 /* binary search in table of non-spacing characters */
93 if (bisearch(ch, zero_width, sizeof(zero_width)
94 / sizeof(struct interval) - 1))
97 /* binary search in table of double width characters */
98 if (bisearch(ch, double_width, sizeof(double_width)
99 / sizeof(struct interval) - 1))
106 * Pick one ucs character starting from the location *start points at,
107 * and return it, while updating the *start pointer to point at the
108 * end of that character. When remainder_p is not NULL, the location
109 * holds the number of bytes remaining in the string that we are allowed
110 * to pick from. Otherwise we are allowed to pick up to the NUL that
111 * would eventually appear in the string. *remainder_p is also reduced
112 * by the number of bytes we have consumed.
114 * If the string was not a valid UTF-8, *start pointer is set to NULL
115 * and the return value is undefined.
117 static ucs_char_t pick_one_utf8_char(const char **start, size_t *remainder_p)
119 unsigned char *s = (unsigned char *)*start;
121 size_t remainder, incr;
124 * A caller that assumes NUL terminated text can choose
125 * not to bother with the remainder length. We will
126 * stop at the first NUL.
128 remainder = (remainder_p ? *remainder_p : 999);
132 } else if (*s < 0x80) {
136 } else if ((s[0] & 0xe0) == 0xc0) {
137 /* 110XXXXx 10xxxxxx */
139 (s[1] & 0xc0) != 0x80 ||
140 (s[0] & 0xfe) == 0xc0)
142 ch = ((s[0] & 0x1f) << 6) | (s[1] & 0x3f);
144 } else if ((s[0] & 0xf0) == 0xe0) {
145 /* 1110XXXX 10Xxxxxx 10xxxxxx */
147 (s[1] & 0xc0) != 0x80 ||
148 (s[2] & 0xc0) != 0x80 ||
150 (s[0] == 0xe0 && (s[1] & 0xe0) == 0x80) ||
152 (s[0] == 0xed && (s[1] & 0xe0) == 0xa0) ||
153 /* U+FFFE or U+FFFF? */
154 (s[0] == 0xef && s[1] == 0xbf &&
155 (s[2] & 0xfe) == 0xbe))
157 ch = ((s[0] & 0x0f) << 12) |
158 ((s[1] & 0x3f) << 6) | (s[2] & 0x3f);
160 } else if ((s[0] & 0xf8) == 0xf0) {
161 /* 11110XXX 10XXxxxx 10xxxxxx 10xxxxxx */
163 (s[1] & 0xc0) != 0x80 ||
164 (s[2] & 0xc0) != 0x80 ||
165 (s[3] & 0xc0) != 0x80 ||
167 (s[0] == 0xf0 && (s[1] & 0xf0) == 0x80) ||
169 (s[0] == 0xf4 && s[1] > 0x8f) || s[0] > 0xf4)
171 ch = ((s[0] & 0x07) << 18) | ((s[1] & 0x3f) << 12) |
172 ((s[2] & 0x3f) << 6) | (s[3] & 0x3f);
182 *remainder_p = remainder - incr;
187 * This function returns the number of columns occupied by the character
188 * pointed to by the variable start. The pointer is updated to point at
189 * the next character. When remainder_p is not NULL, it points at the
190 * location that stores the number of remaining bytes we can use to pick
191 * a character (see pick_one_utf8_char() above).
193 int utf8_width(const char **start, size_t *remainder_p)
195 ucs_char_t ch = pick_one_utf8_char(start, remainder_p);
198 return git_wcwidth(ch);
202 * Returns the total number of columns required by a null-terminated
203 * string, assuming that the string is utf8. Returns strlen() instead
204 * if the string does not look like a valid utf8 string.
206 int utf8_strnwidth(const char *string, int len, int skip_ansi)
209 const char *orig = string;
212 len = strlen(string);
213 while (string && string < orig + len) {
216 (skip = display_mode_esc_sequence_len(string)) != 0)
218 width += utf8_width(&string, NULL);
220 return string ? width : len;
223 int utf8_strwidth(const char *string)
225 return utf8_strnwidth(string, -1, 0);
228 int is_utf8(const char *text)
231 if (*text == '\n' || *text == '\t' || *text == '\r') {
235 utf8_width(&text, NULL);
242 static void strbuf_add_indented_text(struct strbuf *buf, const char *text,
243 int indent, int indent2)
248 const char *eol = strchrnul(text, '\n');
251 strbuf_addchars(buf, ' ', indent);
252 strbuf_add(buf, text, eol - text);
259 * Wrap the text, if necessary. The variable indent is the indent for the
260 * first line, indent2 is the indent for all other lines.
261 * If indent is negative, assume that already -indent columns have been
262 * consumed (and no extra indent is necessary for the first line).
264 void strbuf_add_wrapped_text(struct strbuf *buf,
265 const char *text, int indent1, int indent2, int width)
267 int indent, w, assume_utf8 = 1;
268 const char *bol, *space, *start = text;
269 size_t orig_len = buf->len;
272 strbuf_add_indented_text(buf, text, indent1, indent2);
278 w = indent = indent1;
289 while ((skip = display_mode_esc_sequence_len(text)))
293 if (!c || isspace(c)) {
294 if (w <= width || !space) {
295 const char *start = bol;
296 if (!c && text == start)
301 strbuf_addchars(buf, ' ', indent);
302 strbuf_add(buf, start, text - start);
308 else if (c == '\n') {
310 if (*space == '\n') {
311 strbuf_addch(buf, '\n');
314 else if (!isalnum(*space))
317 strbuf_addch(buf, ' ');
324 strbuf_addch(buf, '\n');
325 text = bol = space + isspace(*space);
327 w = indent = indent2;
332 w += utf8_width(&text, NULL);
336 strbuf_setlen(buf, orig_len);
346 void strbuf_add_wrapped_bytes(struct strbuf *buf, const char *data, int len,
347 int indent, int indent2, int width)
349 char *tmp = xstrndup(data, len);
350 strbuf_add_wrapped_text(buf, tmp, indent, indent2, width);
354 void strbuf_utf8_replace(struct strbuf *sb_src, int pos, int width,
357 struct strbuf sb_dst = STRBUF_INIT;
358 char *src = sb_src->buf;
359 char *end = src + sb_src->len;
361 int w = 0, subst_len = 0;
364 subst_len = strlen(subst);
365 strbuf_grow(&sb_dst, sb_src->len + subst_len);
372 while ((n = display_mode_esc_sequence_len(src))) {
382 n = utf8_width((const char**)&src, NULL);
383 if (!src) /* broken utf-8, do nothing */
385 if (n && w >= pos && w < pos + width) {
387 memcpy(dst, subst, subst_len);
394 memcpy(dst, old, src - old);
398 strbuf_setlen(&sb_dst, dst - sb_dst.buf);
399 strbuf_swap(sb_src, &sb_dst);
400 strbuf_release(&sb_dst);
403 int is_encoding_utf8(const char *name)
407 if (!strcasecmp(name, "utf-8") || !strcasecmp(name, "utf8"))
412 int same_encoding(const char *src, const char *dst)
414 if (is_encoding_utf8(src) && is_encoding_utf8(dst))
416 return !strcasecmp(src, dst);
420 * Wrapper for fprintf and returns the total number of columns required
421 * for the printed string, assuming that the string is utf8.
423 int utf8_fprintf(FILE *stream, const char *format, ...)
425 struct strbuf buf = STRBUF_INIT;
429 va_start(arg, format);
430 strbuf_vaddf(&buf, format, arg);
433 columns = fputs(buf.buf, stream);
434 if (0 <= columns) /* keep the error from the I/O */
435 columns = utf8_strwidth(buf.buf);
436 strbuf_release(&buf);
441 * Given a buffer and its encoding, return it re-encoded
442 * with iconv. If the conversion fails, returns NULL.
445 #if defined(OLD_ICONV) || (defined(__sun__) && !defined(_XPG6))
446 typedef const char * iconv_ibp;
448 typedef char * iconv_ibp;
450 char *reencode_string_iconv(const char *in, size_t insz, iconv_t conv, int *outsz_p)
452 size_t outsz, outalloc;
457 outalloc = outsz + 1; /* for terminating NUL */
458 out = xmalloc(outalloc);
463 size_t cnt = iconv(conv, &cp, &insz, &outpos, &outsz);
465 if (cnt == (size_t) -1) {
467 if (errno != E2BIG) {
471 /* insz has remaining number of bytes.
472 * since we started outsz the same as insz,
473 * it is likely that insz is not enough for
474 * converting the rest.
476 sofar = outpos - out;
477 outalloc = sofar + insz * 2 + 32;
478 out = xrealloc(out, outalloc);
479 outpos = out + sofar;
480 outsz = outalloc - sofar - 1;
485 *outsz_p = outpos - out;
492 static const char *fallback_encoding(const char *name)
495 * Some platforms do not have the variously spelled variants of
496 * UTF-8, so let's fall back to trying the most official
497 * spelling. We do so only as a fallback in case the platform
498 * does understand the user's spelling, but not our official
501 if (is_encoding_utf8(name))
505 * Even though latin-1 is still seen in e-mail
506 * headers, some platforms only install ISO-8859-1.
508 if (!strcasecmp(name, "latin-1"))
514 char *reencode_string_len(const char *in, int insz,
515 const char *out_encoding, const char *in_encoding,
524 conv = iconv_open(out_encoding, in_encoding);
525 if (conv == (iconv_t) -1) {
526 in_encoding = fallback_encoding(in_encoding);
527 out_encoding = fallback_encoding(out_encoding);
529 conv = iconv_open(out_encoding, in_encoding);
530 if (conv == (iconv_t) -1)
534 out = reencode_string_iconv(in, insz, conv, outsz);
541 * Returns first character length in bytes for multi-byte `text` according to
544 * - The `text` pointer is updated to point at the next character.
545 * - When `remainder_p` is not NULL, on entry `*remainder_p` is how much bytes
546 * we can consume from text, and on exit `*remainder_p` is reduced by returned
547 * character length. Otherwise `text` is treated as limited by NUL.
549 int mbs_chrlen(const char **text, size_t *remainder_p, const char *encoding)
552 const char *p = *text;
553 size_t r = (remainder_p ? *remainder_p : SIZE_MAX);
558 if (is_encoding_utf8(encoding)) {
559 pick_one_utf8_char(&p, &r);
561 chrlen = p ? (p - *text)
562 : 1 /* not valid UTF-8 -> raw byte sequence */;
566 * TODO use iconv to decode one char and obtain its chrlen
567 * for now, let's treat encodings != UTF-8 as one-byte
574 *remainder_p -= chrlen;
580 * Pick the next char from the stream, ignoring codepoints an HFS+ would.
581 * Note that this is _not_ complete by any means. It's just enough
582 * to make is_hfs_dotgit() work, and should not be used otherwise.
584 static ucs_char_t next_hfs_char(const char **in)
587 ucs_char_t out = pick_one_utf8_char(in, NULL);
589 * check for malformed utf8. Technically this
590 * gets converted to a percent-sequence, but
591 * returning 0 is good enough for is_hfs_dotgit
592 * to realize it cannot be .git
597 /* these code points are ignored completely */
599 case 0x200c: /* ZERO WIDTH NON-JOINER */
600 case 0x200d: /* ZERO WIDTH JOINER */
601 case 0x200e: /* LEFT-TO-RIGHT MARK */
602 case 0x200f: /* RIGHT-TO-LEFT MARK */
603 case 0x202a: /* LEFT-TO-RIGHT EMBEDDING */
604 case 0x202b: /* RIGHT-TO-LEFT EMBEDDING */
605 case 0x202c: /* POP DIRECTIONAL FORMATTING */
606 case 0x202d: /* LEFT-TO-RIGHT OVERRIDE */
607 case 0x202e: /* RIGHT-TO-LEFT OVERRIDE */
608 case 0x206a: /* INHIBIT SYMMETRIC SWAPPING */
609 case 0x206b: /* ACTIVATE SYMMETRIC SWAPPING */
610 case 0x206c: /* INHIBIT ARABIC FORM SHAPING */
611 case 0x206d: /* ACTIVATE ARABIC FORM SHAPING */
612 case 0x206e: /* NATIONAL DIGIT SHAPES */
613 case 0x206f: /* NOMINAL DIGIT SHAPES */
614 case 0xfeff: /* ZERO WIDTH NO-BREAK SPACE */
622 int is_hfs_dotgit(const char *path)
626 c = next_hfs_char(&path);
629 c = next_hfs_char(&path);
632 * there's a great deal of other case-folding that occurs
633 * in HFS+, but this is enough to catch anything that will
636 if (c != 'g' && c != 'G')
638 c = next_hfs_char(&path);
639 if (c != 'i' && c != 'I')
641 c = next_hfs_char(&path);
642 if (c != 't' && c != 'T')
644 c = next_hfs_char(&path);
645 if (c && !is_dir_sep(c))
651 const char utf8_bom[] = "\357\273\277";
653 int skip_utf8_bom(char **text, size_t len)
655 if (len < strlen(utf8_bom) ||
656 memcmp(*text, utf8_bom, strlen(utf8_bom)))
658 *text += strlen(utf8_bom);
662 void strbuf_utf8_align(struct strbuf *buf, align_type position, unsigned int width,
665 int slen = strlen(s);
666 int display_len = utf8_strnwidth(s, slen, 0);
667 int utf8_compensation = slen - display_len;
669 if (display_len >= width) {
670 strbuf_addstr(buf, s);
674 if (position == ALIGN_LEFT)
675 strbuf_addf(buf, "%-*s", width + utf8_compensation, s);
676 else if (position == ALIGN_MIDDLE) {
677 int left = (width - display_len) / 2;
678 strbuf_addf(buf, "%*s%-*s", left, "", width - left + utf8_compensation, s);
679 } else if (position == ALIGN_RIGHT)
680 strbuf_addf(buf, "%*s", width + utf8_compensation, s);