5 int starts_with(const char *str, const char *prefix)
7 for (; ; str++, prefix++)
10 else if (*str != *prefix)
15 * Used as the default ->buf value, so that people can always assume
16 * buf is non NULL and ->buf is NUL terminated even for a freshly
19 char strbuf_slopbuf[1];
21 void strbuf_init(struct strbuf *sb, size_t hint)
23 sb->alloc = sb->len = 0;
24 sb->buf = strbuf_slopbuf;
26 strbuf_grow(sb, hint);
29 void strbuf_release(struct strbuf *sb)
37 char *strbuf_detach(struct strbuf *sb, size_t *sz)
48 void strbuf_attach(struct strbuf *sb, void *buf, size_t len, size_t alloc)
55 sb->buf[sb->len] = '\0';
58 void strbuf_grow(struct strbuf *sb, size_t extra)
60 int new_buf = !sb->alloc;
61 if (unsigned_add_overflows(extra, 1) ||
62 unsigned_add_overflows(sb->len, extra + 1))
63 die("you want to use way too much memory");
66 ALLOC_GROW(sb->buf, sb->len + extra + 1, sb->alloc);
71 void strbuf_trim(struct strbuf *sb)
76 void strbuf_rtrim(struct strbuf *sb)
78 while (sb->len > 0 && isspace((unsigned char)sb->buf[sb->len - 1]))
80 sb->buf[sb->len] = '\0';
83 void strbuf_ltrim(struct strbuf *sb)
86 while (sb->len > 0 && isspace(*b)) {
90 memmove(sb->buf, b, sb->len);
91 sb->buf[sb->len] = '\0';
94 int strbuf_reencode(struct strbuf *sb, const char *from, const char *to)
99 if (same_encoding(from, to))
102 out = reencode_string_len(sb->buf, sb->len, to, from, &len);
106 strbuf_attach(sb, out, len, len);
110 void strbuf_tolower(struct strbuf *sb)
112 char *p = sb->buf, *end = sb->buf + sb->len;
117 struct strbuf **strbuf_split_buf(const char *str, size_t slen,
118 int terminator, int max)
120 struct strbuf **ret = NULL;
121 size_t nr = 0, alloc = 0;
126 if (max <= 0 || nr + 1 < max) {
127 const char *end = memchr(str, terminator, slen);
131 t = xmalloc(sizeof(struct strbuf));
133 strbuf_add(t, str, len);
134 ALLOC_GROW(ret, nr + 2, alloc);
139 ALLOC_GROW(ret, nr + 1, alloc); /* In case string was empty */
144 void strbuf_list_free(struct strbuf **sbs)
146 struct strbuf **s = sbs;
155 int strbuf_cmp(const struct strbuf *a, const struct strbuf *b)
157 int len = a->len < b->len ? a->len: b->len;
158 int cmp = memcmp(a->buf, b->buf, len);
161 return a->len < b->len ? -1: a->len != b->len;
164 void strbuf_splice(struct strbuf *sb, size_t pos, size_t len,
165 const void *data, size_t dlen)
167 if (unsigned_add_overflows(pos, len))
168 die("you want to use way too much memory");
170 die("`pos' is too far after the end of the buffer");
171 if (pos + len > sb->len)
172 die("`pos + len' is too far after the end of the buffer");
175 strbuf_grow(sb, dlen - len);
176 memmove(sb->buf + pos + dlen,
178 sb->len - pos - len);
179 memcpy(sb->buf + pos, data, dlen);
180 strbuf_setlen(sb, sb->len + dlen - len);
183 void strbuf_insert(struct strbuf *sb, size_t pos, const void *data, size_t len)
185 strbuf_splice(sb, pos, 0, data, len);
188 void strbuf_remove(struct strbuf *sb, size_t pos, size_t len)
190 strbuf_splice(sb, pos, len, NULL, 0);
193 void strbuf_add(struct strbuf *sb, const void *data, size_t len)
195 strbuf_grow(sb, len);
196 memcpy(sb->buf + sb->len, data, len);
197 strbuf_setlen(sb, sb->len + len);
200 void strbuf_adddup(struct strbuf *sb, size_t pos, size_t len)
202 strbuf_grow(sb, len);
203 memcpy(sb->buf + sb->len, sb->buf + pos, len);
204 strbuf_setlen(sb, sb->len + len);
207 void strbuf_addchars(struct strbuf *sb, int c, size_t n)
210 memset(sb->buf + sb->len, c, n);
211 strbuf_setlen(sb, sb->len + n);
214 void strbuf_addf(struct strbuf *sb, const char *fmt, ...)
218 strbuf_vaddf(sb, fmt, ap);
222 static void add_lines(struct strbuf *out,
225 const char *buf, size_t size)
229 const char *next = memchr(buf, '\n', size);
230 next = next ? (next + 1) : (buf + size);
232 prefix = ((prefix2 && (buf[0] == '\n' || buf[0] == '\t'))
233 ? prefix2 : prefix1);
234 strbuf_addstr(out, prefix);
235 strbuf_add(out, buf, next - buf);
239 strbuf_complete_line(out);
242 void strbuf_add_commented_lines(struct strbuf *out, const char *buf, size_t size)
244 static char prefix1[3];
245 static char prefix2[2];
247 if (prefix1[0] != comment_line_char) {
248 xsnprintf(prefix1, sizeof(prefix1), "%c ", comment_line_char);
249 xsnprintf(prefix2, sizeof(prefix2), "%c", comment_line_char);
251 add_lines(out, prefix1, prefix2, buf, size);
254 void strbuf_commented_addf(struct strbuf *sb, const char *fmt, ...)
257 struct strbuf buf = STRBUF_INIT;
258 int incomplete_line = sb->len && sb->buf[sb->len - 1] != '\n';
260 va_start(params, fmt);
261 strbuf_vaddf(&buf, fmt, params);
264 strbuf_add_commented_lines(sb, buf.buf, buf.len);
266 sb->buf[--sb->len] = '\0';
268 strbuf_release(&buf);
271 void strbuf_vaddf(struct strbuf *sb, const char *fmt, va_list ap)
276 if (!strbuf_avail(sb))
279 len = vsnprintf(sb->buf + sb->len, sb->alloc - sb->len, fmt, cp);
282 die("BUG: your vsnprintf is broken (returned %d)", len);
283 if (len > strbuf_avail(sb)) {
284 strbuf_grow(sb, len);
285 len = vsnprintf(sb->buf + sb->len, sb->alloc - sb->len, fmt, ap);
286 if (len > strbuf_avail(sb))
287 die("BUG: your vsnprintf is broken (insatiable)");
289 strbuf_setlen(sb, sb->len + len);
292 void strbuf_expand(struct strbuf *sb, const char *format, expand_fn_t fn,
299 percent = strchrnul(format, '%');
300 strbuf_add(sb, format, percent - format);
303 format = percent + 1;
305 if (*format == '%') {
306 strbuf_addch(sb, '%');
311 consumed = fn(sb, format, context);
315 strbuf_addch(sb, '%');
319 size_t strbuf_expand_dict_cb(struct strbuf *sb, const char *placeholder,
322 struct strbuf_expand_dict_entry *e = context;
325 for (; e->placeholder && (len = strlen(e->placeholder)); e++) {
326 if (!strncmp(placeholder, e->placeholder, len)) {
328 strbuf_addstr(sb, e->value);
335 void strbuf_addbuf_percentquote(struct strbuf *dst, const struct strbuf *src)
337 int i, len = src->len;
339 for (i = 0; i < len; i++) {
340 if (src->buf[i] == '%')
341 strbuf_addch(dst, '%');
342 strbuf_addch(dst, src->buf[i]);
346 size_t strbuf_fread(struct strbuf *sb, size_t size, FILE *f)
349 size_t oldalloc = sb->alloc;
351 strbuf_grow(sb, size);
352 res = fread(sb->buf + sb->len, 1, size, f);
354 strbuf_setlen(sb, sb->len + res);
355 else if (oldalloc == 0)
360 ssize_t strbuf_read(struct strbuf *sb, int fd, size_t hint)
362 size_t oldlen = sb->len;
363 size_t oldalloc = sb->alloc;
365 strbuf_grow(sb, hint ? hint : 8192);
367 ssize_t want = sb->alloc - sb->len - 1;
368 ssize_t got = read_in_full(fd, sb->buf + sb->len, want);
374 strbuf_setlen(sb, oldlen);
380 strbuf_grow(sb, 8192);
383 sb->buf[sb->len] = '\0';
384 return sb->len - oldlen;
387 ssize_t strbuf_read_once(struct strbuf *sb, int fd, size_t hint)
391 strbuf_grow(sb, hint ? hint : 8192);
392 cnt = xread(fd, sb->buf + sb->len, sb->alloc - sb->len - 1);
394 strbuf_setlen(sb, sb->len + cnt);
398 ssize_t strbuf_write(struct strbuf *sb, FILE *f)
400 return sb->len ? fwrite(sb->buf, 1, sb->len, f) : 0;
404 #define STRBUF_MAXLINK (2*PATH_MAX)
406 int strbuf_readlink(struct strbuf *sb, const char *path, size_t hint)
408 size_t oldalloc = sb->alloc;
413 while (hint < STRBUF_MAXLINK) {
416 strbuf_grow(sb, hint);
417 len = readlink(path, sb->buf, hint);
421 } else if (len < hint) {
422 strbuf_setlen(sb, len);
426 /* .. the buffer was too small - try again */
434 int strbuf_getcwd(struct strbuf *sb)
436 size_t oldalloc = sb->alloc;
437 size_t guessed_len = 128;
439 for (;; guessed_len *= 2) {
440 strbuf_grow(sb, guessed_len);
441 if (getcwd(sb->buf, sb->alloc)) {
442 strbuf_setlen(sb, strlen(sb->buf));
456 int strbuf_getwholeline(struct strbuf *sb, FILE *fp, int term)
465 /* Translate slopbuf to NULL, as we cannot call realloc on it */
468 r = getdelim(&sb->buf, &sb->alloc, term, fp);
477 * Normally we would have called xrealloc, which will try to free
478 * memory and recover. But we have no way to tell getdelim() to do so.
479 * Worse, we cannot try to recover ENOMEM ourselves, because we have
480 * no idea how many bytes were read by getdelim.
482 * Dying here is reasonable. It mirrors what xrealloc would do on
483 * catastrophic memory failure. We skip the opportunity to free pack
484 * memory and retry, but that's unlikely to help for a malloc small
485 * enough to hold a single line of input, anyway.
488 die("Out of memory, getdelim failed");
491 * Restore strbuf invariants; if getdelim left us with a NULL pointer,
492 * we can just re-init, but otherwise we should make sure that our
493 * length is empty, and that the result is NUL-terminated.
502 int strbuf_getwholeline(struct strbuf *sb, FILE *fp, int term)
511 while ((ch = getc_unlocked(fp)) != EOF) {
512 if (!strbuf_avail(sb))
514 sb->buf[sb->len++] = ch;
519 if (ch == EOF && sb->len == 0)
522 sb->buf[sb->len] = '\0';
527 static int strbuf_getdelim(struct strbuf *sb, FILE *fp, int term)
529 if (strbuf_getwholeline(sb, fp, term))
531 if (sb->buf[sb->len - 1] == term)
532 strbuf_setlen(sb, sb->len - 1);
536 int strbuf_getline(struct strbuf *sb, FILE *fp)
538 if (strbuf_getwholeline(sb, fp, '\n'))
540 if (sb->buf[sb->len - 1] == '\n') {
541 strbuf_setlen(sb, sb->len - 1);
542 if (sb->len && sb->buf[sb->len - 1] == '\r')
543 strbuf_setlen(sb, sb->len - 1);
548 int strbuf_getline_lf(struct strbuf *sb, FILE *fp)
550 return strbuf_getdelim(sb, fp, '\n');
553 int strbuf_getline_nul(struct strbuf *sb, FILE *fp)
555 return strbuf_getdelim(sb, fp, '\0');
558 int strbuf_getwholeline_fd(struct strbuf *sb, int fd, int term)
564 ssize_t len = xread(fd, &ch, 1);
567 strbuf_addch(sb, ch);
574 ssize_t strbuf_read_file(struct strbuf *sb, const char *path, size_t hint)
579 fd = open(path, O_RDONLY);
582 len = strbuf_read(sb, fd, hint);
590 void strbuf_add_lines(struct strbuf *out, const char *prefix,
591 const char *buf, size_t size)
593 add_lines(out, prefix, NULL, buf, size);
596 void strbuf_addstr_xml_quoted(struct strbuf *buf, const char *s)
599 size_t len = strcspn(s, "\"<>&");
600 strbuf_add(buf, s, len);
604 strbuf_addstr(buf, """);
607 strbuf_addstr(buf, "<");
610 strbuf_addstr(buf, ">");
613 strbuf_addstr(buf, "&");
622 static int is_rfc3986_reserved(char ch)
625 case '!': case '*': case '\'': case '(': case ')': case ';':
626 case ':': case '@': case '&': case '=': case '+': case '$':
627 case ',': case '/': case '?': case '#': case '[': case ']':
633 static int is_rfc3986_unreserved(char ch)
635 return isalnum(ch) ||
636 ch == '-' || ch == '_' || ch == '.' || ch == '~';
639 static void strbuf_add_urlencode(struct strbuf *sb, const char *s, size_t len,
642 strbuf_grow(sb, len);
645 if (is_rfc3986_unreserved(ch) ||
646 (!reserved && is_rfc3986_reserved(ch)))
647 strbuf_addch(sb, ch);
649 strbuf_addf(sb, "%%%02x", ch);
653 void strbuf_addstr_urlencode(struct strbuf *sb, const char *s,
656 strbuf_add_urlencode(sb, s, strlen(s), reserved);
659 void strbuf_humanise_bytes(struct strbuf *buf, off_t bytes)
661 if (bytes > 1 << 30) {
662 strbuf_addf(buf, "%u.%2.2u GiB",
664 (int)(bytes & ((1 << 30) - 1)) / 10737419);
665 } else if (bytes > 1 << 20) {
666 int x = bytes + 5243; /* for rounding */
667 strbuf_addf(buf, "%u.%2.2u MiB",
668 x >> 20, ((x & ((1 << 20) - 1)) * 100) >> 20);
669 } else if (bytes > 1 << 10) {
670 int x = bytes + 5; /* for rounding */
671 strbuf_addf(buf, "%u.%2.2u KiB",
672 x >> 10, ((x & ((1 << 10) - 1)) * 100) >> 10);
674 strbuf_addf(buf, "%u bytes", (int)bytes);
678 void strbuf_add_absolute_path(struct strbuf *sb, const char *path)
681 die("The empty string is not a valid path");
682 if (!is_absolute_path(path)) {
683 struct stat cwd_stat, pwd_stat;
684 size_t orig_len = sb->len;
685 char *cwd = xgetcwd();
686 char *pwd = getenv("PWD");
687 if (pwd && strcmp(pwd, cwd) &&
688 !stat(cwd, &cwd_stat) &&
689 (cwd_stat.st_dev || cwd_stat.st_ino) &&
690 !stat(pwd, &pwd_stat) &&
691 pwd_stat.st_dev == cwd_stat.st_dev &&
692 pwd_stat.st_ino == cwd_stat.st_ino)
693 strbuf_addstr(sb, pwd);
695 strbuf_addstr(sb, cwd);
696 if (sb->len > orig_len && !is_dir_sep(sb->buf[sb->len - 1]))
697 strbuf_addch(sb, '/');
700 strbuf_addstr(sb, path);
703 int printf_ln(const char *fmt, ...)
708 ret = vprintf(fmt, ap);
710 if (ret < 0 || putchar('\n') == EOF)
715 int fprintf_ln(FILE *fp, const char *fmt, ...)
720 ret = vfprintf(fp, fmt, ap);
722 if (ret < 0 || putc('\n', fp) == EOF)
727 char *xstrdup_tolower(const char *string)
732 len = strlen(string);
733 result = xmallocz(len);
734 for (i = 0; i < len; i++)
735 result[i] = tolower(string[i]);
740 char *xstrvfmt(const char *fmt, va_list ap)
742 struct strbuf buf = STRBUF_INIT;
743 strbuf_vaddf(&buf, fmt, ap);
744 return strbuf_detach(&buf, NULL);
747 char *xstrfmt(const char *fmt, ...)
753 ret = xstrvfmt(fmt, ap);
759 void strbuf_addftime(struct strbuf *sb, const char *fmt, const struct tm *tm)
767 strbuf_grow(sb, hint);
768 len = strftime(sb->buf + sb->len, sb->alloc - sb->len, fmt, tm);
772 * strftime reports "0" if it could not fit the result in the buffer.
773 * Unfortunately, it also reports "0" if the requested time string
774 * takes 0 bytes. So our strategy is to munge the format so that the
775 * output contains at least one character, and then drop the extra
776 * character before returning.
778 struct strbuf munged_fmt = STRBUF_INIT;
779 strbuf_addf(&munged_fmt, "%s ", fmt);
782 strbuf_grow(sb, hint);
783 len = strftime(sb->buf + sb->len, sb->alloc - sb->len,
786 strbuf_release(&munged_fmt);
787 len--; /* drop munged space */
789 strbuf_setlen(sb, sb->len + len);
792 void strbuf_add_unique_abbrev(struct strbuf *sb, const unsigned char *sha1,
796 strbuf_grow(sb, GIT_SHA1_HEXSZ + 1);
797 r = find_unique_abbrev_r(sb->buf + sb->len, sha1, abbrev_len);
798 strbuf_setlen(sb, sb->len + r);
802 * Returns the length of a line, without trailing spaces.
804 * If the line ends with newline, it will be removed too.
806 static size_t cleanup(char *line, size_t len)
809 unsigned char c = line[len - 1];
819 * Remove empty lines from the beginning and end
820 * and also trailing spaces from every line.
822 * Turn multiple consecutive empty lines between paragraphs
823 * into just one empty line.
825 * If the input has only empty lines and spaces,
826 * no output will be produced.
828 * If last line does not have a newline at the end, one is added.
830 * Enable skip_comments to skip every line starting with comment
833 void strbuf_stripspace(struct strbuf *sb, int skip_comments)
836 size_t i, j, len, newlen;
839 /* We may have to add a newline. */
842 for (i = j = 0; i < sb->len; i += len, j += newlen) {
843 eol = memchr(sb->buf + i, '\n', sb->len - i);
844 len = eol ? eol - (sb->buf + i) + 1 : sb->len - i;
846 if (skip_comments && len && sb->buf[i] == comment_line_char) {
850 newlen = cleanup(sb->buf + i, len);
852 /* Not just an empty line? */
854 if (empties > 0 && j > 0)
857 memmove(sb->buf + j, sb->buf + i, newlen);
858 sb->buf[newlen + j++] = '\n';
864 strbuf_setlen(sb, j);