Merge branch 'sg/test-bash-version-fix'
[git.git] / strbuf.c
blobf6a6cf78b9426abfa73a2053c17326fd645645e7
1 #include "cache.h"
2 #include "refs.h"
3 #include "string-list.h"
4 #include "utf8.h"
6 int starts_with(const char *str, const char *prefix)
8 for (; ; str++, prefix++)
9 if (!*prefix)
10 return 1;
11 else if (*str != *prefix)
12 return 0;
15 int istarts_with(const char *str, const char *prefix)
17 for (; ; str++, prefix++)
18 if (!*prefix)
19 return 1;
20 else if (tolower(*str) != tolower(*prefix))
21 return 0;
24 int skip_to_optional_arg_default(const char *str, const char *prefix,
25 const char **arg, const char *def)
27 const char *p;
29 if (!skip_prefix(str, prefix, &p))
30 return 0;
32 if (!*p) {
33 if (arg)
34 *arg = def;
35 return 1;
38 if (*p != '=')
39 return 0;
41 if (arg)
42 *arg = p + 1;
43 return 1;
47 * Used as the default ->buf value, so that people can always assume
48 * buf is non NULL and ->buf is NUL terminated even for a freshly
49 * initialized strbuf.
51 char strbuf_slopbuf[1];
53 void strbuf_init(struct strbuf *sb, size_t hint)
55 sb->alloc = sb->len = 0;
56 sb->buf = strbuf_slopbuf;
57 if (hint)
58 strbuf_grow(sb, hint);
61 void strbuf_release(struct strbuf *sb)
63 if (sb->alloc) {
64 free(sb->buf);
65 strbuf_init(sb, 0);
69 char *strbuf_detach(struct strbuf *sb, size_t *sz)
71 char *res;
72 strbuf_grow(sb, 0);
73 res = sb->buf;
74 if (sz)
75 *sz = sb->len;
76 strbuf_init(sb, 0);
77 return res;
80 void strbuf_attach(struct strbuf *sb, void *buf, size_t len, size_t alloc)
82 strbuf_release(sb);
83 sb->buf = buf;
84 sb->len = len;
85 sb->alloc = alloc;
86 strbuf_grow(sb, 0);
87 sb->buf[sb->len] = '\0';
90 void strbuf_grow(struct strbuf *sb, size_t extra)
92 int new_buf = !sb->alloc;
93 if (unsigned_add_overflows(extra, 1) ||
94 unsigned_add_overflows(sb->len, extra + 1))
95 die("you want to use way too much memory");
96 if (new_buf)
97 sb->buf = NULL;
98 ALLOC_GROW(sb->buf, sb->len + extra + 1, sb->alloc);
99 if (new_buf)
100 sb->buf[0] = '\0';
103 void strbuf_trim(struct strbuf *sb)
105 strbuf_rtrim(sb);
106 strbuf_ltrim(sb);
109 void strbuf_rtrim(struct strbuf *sb)
111 while (sb->len > 0 && isspace((unsigned char)sb->buf[sb->len - 1]))
112 sb->len--;
113 sb->buf[sb->len] = '\0';
116 void strbuf_trim_trailing_dir_sep(struct strbuf *sb)
118 while (sb->len > 0 && is_dir_sep((unsigned char)sb->buf[sb->len - 1]))
119 sb->len--;
120 sb->buf[sb->len] = '\0';
123 void strbuf_trim_trailing_newline(struct strbuf *sb)
125 if (sb->len > 0 && sb->buf[sb->len - 1] == '\n') {
126 if (--sb->len > 0 && sb->buf[sb->len - 1] == '\r')
127 --sb->len;
128 sb->buf[sb->len] = '\0';
132 void strbuf_ltrim(struct strbuf *sb)
134 char *b = sb->buf;
135 while (sb->len > 0 && isspace(*b)) {
136 b++;
137 sb->len--;
139 memmove(sb->buf, b, sb->len);
140 sb->buf[sb->len] = '\0';
143 int strbuf_reencode(struct strbuf *sb, const char *from, const char *to)
145 char *out;
146 size_t len;
148 if (same_encoding(from, to))
149 return 0;
151 out = reencode_string_len(sb->buf, sb->len, to, from, &len);
152 if (!out)
153 return -1;
155 strbuf_attach(sb, out, len, len);
156 return 0;
159 void strbuf_tolower(struct strbuf *sb)
161 char *p = sb->buf, *end = sb->buf + sb->len;
162 for (; p < end; p++)
163 *p = tolower(*p);
166 struct strbuf **strbuf_split_buf(const char *str, size_t slen,
167 int terminator, int max)
169 struct strbuf **ret = NULL;
170 size_t nr = 0, alloc = 0;
171 struct strbuf *t;
173 while (slen) {
174 int len = slen;
175 if (max <= 0 || nr + 1 < max) {
176 const char *end = memchr(str, terminator, slen);
177 if (end)
178 len = end - str + 1;
180 t = xmalloc(sizeof(struct strbuf));
181 strbuf_init(t, len);
182 strbuf_add(t, str, len);
183 ALLOC_GROW(ret, nr + 2, alloc);
184 ret[nr++] = t;
185 str += len;
186 slen -= len;
188 ALLOC_GROW(ret, nr + 1, alloc); /* In case string was empty */
189 ret[nr] = NULL;
190 return ret;
193 void strbuf_add_separated_string_list(struct strbuf *str,
194 const char *sep,
195 struct string_list *slist)
197 struct string_list_item *item;
198 int sep_needed = 0;
200 for_each_string_list_item(item, slist) {
201 if (sep_needed)
202 strbuf_addstr(str, sep);
203 strbuf_addstr(str, item->string);
204 sep_needed = 1;
208 void strbuf_list_free(struct strbuf **sbs)
210 struct strbuf **s = sbs;
212 while (*s) {
213 strbuf_release(*s);
214 free(*s++);
216 free(sbs);
219 int strbuf_cmp(const struct strbuf *a, const struct strbuf *b)
221 size_t len = a->len < b->len ? a->len: b->len;
222 int cmp = memcmp(a->buf, b->buf, len);
223 if (cmp)
224 return cmp;
225 return a->len < b->len ? -1: a->len != b->len;
228 void strbuf_splice(struct strbuf *sb, size_t pos, size_t len,
229 const void *data, size_t dlen)
231 if (unsigned_add_overflows(pos, len))
232 die("you want to use way too much memory");
233 if (pos > sb->len)
234 die("`pos' is too far after the end of the buffer");
235 if (pos + len > sb->len)
236 die("`pos + len' is too far after the end of the buffer");
238 if (dlen >= len)
239 strbuf_grow(sb, dlen - len);
240 memmove(sb->buf + pos + dlen,
241 sb->buf + pos + len,
242 sb->len - pos - len);
243 memcpy(sb->buf + pos, data, dlen);
244 strbuf_setlen(sb, sb->len + dlen - len);
247 void strbuf_insert(struct strbuf *sb, size_t pos, const void *data, size_t len)
249 strbuf_splice(sb, pos, 0, data, len);
252 void strbuf_remove(struct strbuf *sb, size_t pos, size_t len)
254 strbuf_splice(sb, pos, len, "", 0);
257 void strbuf_add(struct strbuf *sb, const void *data, size_t len)
259 strbuf_grow(sb, len);
260 memcpy(sb->buf + sb->len, data, len);
261 strbuf_setlen(sb, sb->len + len);
264 void strbuf_addbuf(struct strbuf *sb, const struct strbuf *sb2)
266 strbuf_grow(sb, sb2->len);
267 memcpy(sb->buf + sb->len, sb2->buf, sb2->len);
268 strbuf_setlen(sb, sb->len + sb2->len);
271 void strbuf_addchars(struct strbuf *sb, int c, size_t n)
273 strbuf_grow(sb, n);
274 memset(sb->buf + sb->len, c, n);
275 strbuf_setlen(sb, sb->len + n);
278 void strbuf_addf(struct strbuf *sb, const char *fmt, ...)
280 va_list ap;
281 va_start(ap, fmt);
282 strbuf_vaddf(sb, fmt, ap);
283 va_end(ap);
286 static void add_lines(struct strbuf *out,
287 const char *prefix1,
288 const char *prefix2,
289 const char *buf, size_t size)
291 while (size) {
292 const char *prefix;
293 const char *next = memchr(buf, '\n', size);
294 next = next ? (next + 1) : (buf + size);
296 prefix = ((prefix2 && (buf[0] == '\n' || buf[0] == '\t'))
297 ? prefix2 : prefix1);
298 strbuf_addstr(out, prefix);
299 strbuf_add(out, buf, next - buf);
300 size -= next - buf;
301 buf = next;
303 strbuf_complete_line(out);
306 void strbuf_add_commented_lines(struct strbuf *out, const char *buf, size_t size)
308 static char prefix1[3];
309 static char prefix2[2];
311 if (prefix1[0] != comment_line_char) {
312 xsnprintf(prefix1, sizeof(prefix1), "%c ", comment_line_char);
313 xsnprintf(prefix2, sizeof(prefix2), "%c", comment_line_char);
315 add_lines(out, prefix1, prefix2, buf, size);
318 void strbuf_commented_addf(struct strbuf *sb, const char *fmt, ...)
320 va_list params;
321 struct strbuf buf = STRBUF_INIT;
322 int incomplete_line = sb->len && sb->buf[sb->len - 1] != '\n';
324 va_start(params, fmt);
325 strbuf_vaddf(&buf, fmt, params);
326 va_end(params);
328 strbuf_add_commented_lines(sb, buf.buf, buf.len);
329 if (incomplete_line)
330 sb->buf[--sb->len] = '\0';
332 strbuf_release(&buf);
335 void strbuf_vaddf(struct strbuf *sb, const char *fmt, va_list ap)
337 int len;
338 va_list cp;
340 if (!strbuf_avail(sb))
341 strbuf_grow(sb, 64);
342 va_copy(cp, ap);
343 len = vsnprintf(sb->buf + sb->len, sb->alloc - sb->len, fmt, cp);
344 va_end(cp);
345 if (len < 0)
346 BUG("your vsnprintf is broken (returned %d)", len);
347 if (len > strbuf_avail(sb)) {
348 strbuf_grow(sb, len);
349 len = vsnprintf(sb->buf + sb->len, sb->alloc - sb->len, fmt, ap);
350 if (len > strbuf_avail(sb))
351 BUG("your vsnprintf is broken (insatiable)");
353 strbuf_setlen(sb, sb->len + len);
356 void strbuf_expand(struct strbuf *sb, const char *format, expand_fn_t fn,
357 void *context)
359 for (;;) {
360 const char *percent;
361 size_t consumed;
363 percent = strchrnul(format, '%');
364 strbuf_add(sb, format, percent - format);
365 if (!*percent)
366 break;
367 format = percent + 1;
369 if (*format == '%') {
370 strbuf_addch(sb, '%');
371 format++;
372 continue;
375 consumed = fn(sb, format, context);
376 if (consumed)
377 format += consumed;
378 else
379 strbuf_addch(sb, '%');
383 size_t strbuf_expand_dict_cb(struct strbuf *sb, const char *placeholder,
384 void *context)
386 struct strbuf_expand_dict_entry *e = context;
387 size_t len;
389 for (; e->placeholder && (len = strlen(e->placeholder)); e++) {
390 if (!strncmp(placeholder, e->placeholder, len)) {
391 if (e->value)
392 strbuf_addstr(sb, e->value);
393 return len;
396 return 0;
399 void strbuf_addbuf_percentquote(struct strbuf *dst, const struct strbuf *src)
401 size_t i, len = src->len;
403 for (i = 0; i < len; i++) {
404 if (src->buf[i] == '%')
405 strbuf_addch(dst, '%');
406 strbuf_addch(dst, src->buf[i]);
410 size_t strbuf_fread(struct strbuf *sb, size_t size, FILE *f)
412 size_t res;
413 size_t oldalloc = sb->alloc;
415 strbuf_grow(sb, size);
416 res = fread(sb->buf + sb->len, 1, size, f);
417 if (res > 0)
418 strbuf_setlen(sb, sb->len + res);
419 else if (oldalloc == 0)
420 strbuf_release(sb);
421 return res;
424 ssize_t strbuf_read(struct strbuf *sb, int fd, size_t hint)
426 size_t oldlen = sb->len;
427 size_t oldalloc = sb->alloc;
429 strbuf_grow(sb, hint ? hint : 8192);
430 for (;;) {
431 ssize_t want = sb->alloc - sb->len - 1;
432 ssize_t got = read_in_full(fd, sb->buf + sb->len, want);
434 if (got < 0) {
435 if (oldalloc == 0)
436 strbuf_release(sb);
437 else
438 strbuf_setlen(sb, oldlen);
439 return -1;
441 sb->len += got;
442 if (got < want)
443 break;
444 strbuf_grow(sb, 8192);
447 sb->buf[sb->len] = '\0';
448 return sb->len - oldlen;
451 ssize_t strbuf_read_once(struct strbuf *sb, int fd, size_t hint)
453 size_t oldalloc = sb->alloc;
454 ssize_t cnt;
456 strbuf_grow(sb, hint ? hint : 8192);
457 cnt = xread(fd, sb->buf + sb->len, sb->alloc - sb->len - 1);
458 if (cnt > 0)
459 strbuf_setlen(sb, sb->len + cnt);
460 else if (oldalloc == 0)
461 strbuf_release(sb);
462 return cnt;
465 ssize_t strbuf_write(struct strbuf *sb, FILE *f)
467 return sb->len ? fwrite(sb->buf, 1, sb->len, f) : 0;
471 #define STRBUF_MAXLINK (2*PATH_MAX)
473 int strbuf_readlink(struct strbuf *sb, const char *path, size_t hint)
475 size_t oldalloc = sb->alloc;
477 if (hint < 32)
478 hint = 32;
480 while (hint < STRBUF_MAXLINK) {
481 ssize_t len;
483 strbuf_grow(sb, hint);
484 len = readlink(path, sb->buf, hint);
485 if (len < 0) {
486 if (errno != ERANGE)
487 break;
488 } else if (len < hint) {
489 strbuf_setlen(sb, len);
490 return 0;
493 /* .. the buffer was too small - try again */
494 hint *= 2;
496 if (oldalloc == 0)
497 strbuf_release(sb);
498 return -1;
501 int strbuf_getcwd(struct strbuf *sb)
503 size_t oldalloc = sb->alloc;
504 size_t guessed_len = 128;
506 for (;; guessed_len *= 2) {
507 strbuf_grow(sb, guessed_len);
508 if (getcwd(sb->buf, sb->alloc)) {
509 strbuf_setlen(sb, strlen(sb->buf));
510 return 0;
514 * If getcwd(3) is implemented as a syscall that falls
515 * back to a regular lookup using readdir(3) etc. then
516 * we may be able to avoid EACCES by providing enough
517 * space to the syscall as it's not necessarily bound
518 * to the same restrictions as the fallback.
520 if (errno == EACCES && guessed_len < PATH_MAX)
521 continue;
523 if (errno != ERANGE)
524 break;
526 if (oldalloc == 0)
527 strbuf_release(sb);
528 else
529 strbuf_reset(sb);
530 return -1;
533 #ifdef HAVE_GETDELIM
534 int strbuf_getwholeline(struct strbuf *sb, FILE *fp, int term)
536 ssize_t r;
538 if (feof(fp))
539 return EOF;
541 strbuf_reset(sb);
543 /* Translate slopbuf to NULL, as we cannot call realloc on it */
544 if (!sb->alloc)
545 sb->buf = NULL;
546 errno = 0;
547 r = getdelim(&sb->buf, &sb->alloc, term, fp);
549 if (r > 0) {
550 sb->len = r;
551 return 0;
553 assert(r == -1);
556 * Normally we would have called xrealloc, which will try to free
557 * memory and recover. But we have no way to tell getdelim() to do so.
558 * Worse, we cannot try to recover ENOMEM ourselves, because we have
559 * no idea how many bytes were read by getdelim.
561 * Dying here is reasonable. It mirrors what xrealloc would do on
562 * catastrophic memory failure. We skip the opportunity to free pack
563 * memory and retry, but that's unlikely to help for a malloc small
564 * enough to hold a single line of input, anyway.
566 if (errno == ENOMEM)
567 die("Out of memory, getdelim failed");
570 * Restore strbuf invariants; if getdelim left us with a NULL pointer,
571 * we can just re-init, but otherwise we should make sure that our
572 * length is empty, and that the result is NUL-terminated.
574 if (!sb->buf)
575 strbuf_init(sb, 0);
576 else
577 strbuf_reset(sb);
578 return EOF;
580 #else
581 int strbuf_getwholeline(struct strbuf *sb, FILE *fp, int term)
583 int ch;
585 if (feof(fp))
586 return EOF;
588 strbuf_reset(sb);
589 flockfile(fp);
590 while ((ch = getc_unlocked(fp)) != EOF) {
591 if (!strbuf_avail(sb))
592 strbuf_grow(sb, 1);
593 sb->buf[sb->len++] = ch;
594 if (ch == term)
595 break;
597 funlockfile(fp);
598 if (ch == EOF && sb->len == 0)
599 return EOF;
601 sb->buf[sb->len] = '\0';
602 return 0;
604 #endif
606 static int strbuf_getdelim(struct strbuf *sb, FILE *fp, int term)
608 if (strbuf_getwholeline(sb, fp, term))
609 return EOF;
610 if (sb->buf[sb->len - 1] == term)
611 strbuf_setlen(sb, sb->len - 1);
612 return 0;
615 int strbuf_getline(struct strbuf *sb, FILE *fp)
617 if (strbuf_getwholeline(sb, fp, '\n'))
618 return EOF;
619 if (sb->buf[sb->len - 1] == '\n') {
620 strbuf_setlen(sb, sb->len - 1);
621 if (sb->len && sb->buf[sb->len - 1] == '\r')
622 strbuf_setlen(sb, sb->len - 1);
624 return 0;
627 int strbuf_getline_lf(struct strbuf *sb, FILE *fp)
629 return strbuf_getdelim(sb, fp, '\n');
632 int strbuf_getline_nul(struct strbuf *sb, FILE *fp)
634 return strbuf_getdelim(sb, fp, '\0');
637 int strbuf_getwholeline_fd(struct strbuf *sb, int fd, int term)
639 strbuf_reset(sb);
641 while (1) {
642 char ch;
643 ssize_t len = xread(fd, &ch, 1);
644 if (len <= 0)
645 return EOF;
646 strbuf_addch(sb, ch);
647 if (ch == term)
648 break;
650 return 0;
653 ssize_t strbuf_read_file(struct strbuf *sb, const char *path, size_t hint)
655 int fd;
656 ssize_t len;
657 int saved_errno;
659 fd = open(path, O_RDONLY);
660 if (fd < 0)
661 return -1;
662 len = strbuf_read(sb, fd, hint);
663 saved_errno = errno;
664 close(fd);
665 if (len < 0) {
666 errno = saved_errno;
667 return -1;
670 return len;
673 void strbuf_add_lines(struct strbuf *out, const char *prefix,
674 const char *buf, size_t size)
676 add_lines(out, prefix, NULL, buf, size);
679 void strbuf_addstr_xml_quoted(struct strbuf *buf, const char *s)
681 while (*s) {
682 size_t len = strcspn(s, "\"<>&");
683 strbuf_add(buf, s, len);
684 s += len;
685 switch (*s) {
686 case '"':
687 strbuf_addstr(buf, "&quot;");
688 break;
689 case '<':
690 strbuf_addstr(buf, "&lt;");
691 break;
692 case '>':
693 strbuf_addstr(buf, "&gt;");
694 break;
695 case '&':
696 strbuf_addstr(buf, "&amp;");
697 break;
698 case 0:
699 return;
701 s++;
705 static int is_rfc3986_reserved(char ch)
707 switch (ch) {
708 case '!': case '*': case '\'': case '(': case ')': case ';':
709 case ':': case '@': case '&': case '=': case '+': case '$':
710 case ',': case '/': case '?': case '#': case '[': case ']':
711 return 1;
713 return 0;
716 static int is_rfc3986_unreserved(char ch)
718 return isalnum(ch) ||
719 ch == '-' || ch == '_' || ch == '.' || ch == '~';
722 static void strbuf_add_urlencode(struct strbuf *sb, const char *s, size_t len,
723 int reserved)
725 strbuf_grow(sb, len);
726 while (len--) {
727 char ch = *s++;
728 if (is_rfc3986_unreserved(ch) ||
729 (!reserved && is_rfc3986_reserved(ch)))
730 strbuf_addch(sb, ch);
731 else
732 strbuf_addf(sb, "%%%02x", (unsigned char)ch);
736 void strbuf_addstr_urlencode(struct strbuf *sb, const char *s,
737 int reserved)
739 strbuf_add_urlencode(sb, s, strlen(s), reserved);
742 void strbuf_humanise_bytes(struct strbuf *buf, off_t bytes)
744 if (bytes > 1 << 30) {
745 strbuf_addf(buf, "%u.%2.2u GiB",
746 (unsigned)(bytes >> 30),
747 (unsigned)(bytes & ((1 << 30) - 1)) / 10737419);
748 } else if (bytes > 1 << 20) {
749 unsigned x = bytes + 5243; /* for rounding */
750 strbuf_addf(buf, "%u.%2.2u MiB",
751 x >> 20, ((x & ((1 << 20) - 1)) * 100) >> 20);
752 } else if (bytes > 1 << 10) {
753 unsigned x = bytes + 5; /* for rounding */
754 strbuf_addf(buf, "%u.%2.2u KiB",
755 x >> 10, ((x & ((1 << 10) - 1)) * 100) >> 10);
756 } else {
757 strbuf_addf(buf, "%u bytes", (unsigned)bytes);
761 void strbuf_add_absolute_path(struct strbuf *sb, const char *path)
763 if (!*path)
764 die("The empty string is not a valid path");
765 if (!is_absolute_path(path)) {
766 struct stat cwd_stat, pwd_stat;
767 size_t orig_len = sb->len;
768 char *cwd = xgetcwd();
769 char *pwd = getenv("PWD");
770 if (pwd && strcmp(pwd, cwd) &&
771 !stat(cwd, &cwd_stat) &&
772 (cwd_stat.st_dev || cwd_stat.st_ino) &&
773 !stat(pwd, &pwd_stat) &&
774 pwd_stat.st_dev == cwd_stat.st_dev &&
775 pwd_stat.st_ino == cwd_stat.st_ino)
776 strbuf_addstr(sb, pwd);
777 else
778 strbuf_addstr(sb, cwd);
779 if (sb->len > orig_len && !is_dir_sep(sb->buf[sb->len - 1]))
780 strbuf_addch(sb, '/');
781 free(cwd);
783 strbuf_addstr(sb, path);
786 void strbuf_add_real_path(struct strbuf *sb, const char *path)
788 if (sb->len) {
789 struct strbuf resolved = STRBUF_INIT;
790 strbuf_realpath(&resolved, path, 1);
791 strbuf_addbuf(sb, &resolved);
792 strbuf_release(&resolved);
793 } else
794 strbuf_realpath(sb, path, 1);
797 int printf_ln(const char *fmt, ...)
799 int ret;
800 va_list ap;
801 va_start(ap, fmt);
802 ret = vprintf(fmt, ap);
803 va_end(ap);
804 if (ret < 0 || putchar('\n') == EOF)
805 return -1;
806 return ret + 1;
809 int fprintf_ln(FILE *fp, const char *fmt, ...)
811 int ret;
812 va_list ap;
813 va_start(ap, fmt);
814 ret = vfprintf(fp, fmt, ap);
815 va_end(ap);
816 if (ret < 0 || putc('\n', fp) == EOF)
817 return -1;
818 return ret + 1;
821 char *xstrdup_tolower(const char *string)
823 char *result;
824 size_t len, i;
826 len = strlen(string);
827 result = xmallocz(len);
828 for (i = 0; i < len; i++)
829 result[i] = tolower(string[i]);
830 return result;
833 char *xstrdup_toupper(const char *string)
835 char *result;
836 size_t len, i;
838 len = strlen(string);
839 result = xmallocz(len);
840 for (i = 0; i < len; i++)
841 result[i] = toupper(string[i]);
842 return result;
845 char *xstrvfmt(const char *fmt, va_list ap)
847 struct strbuf buf = STRBUF_INIT;
848 strbuf_vaddf(&buf, fmt, ap);
849 return strbuf_detach(&buf, NULL);
852 char *xstrfmt(const char *fmt, ...)
854 va_list ap;
855 char *ret;
857 va_start(ap, fmt);
858 ret = xstrvfmt(fmt, ap);
859 va_end(ap);
861 return ret;
864 void strbuf_addftime(struct strbuf *sb, const char *fmt, const struct tm *tm,
865 int tz_offset, int suppress_tz_name)
867 struct strbuf munged_fmt = STRBUF_INIT;
868 size_t hint = 128;
869 size_t len;
871 if (!*fmt)
872 return;
875 * There is no portable way to pass timezone information to
876 * strftime, so we handle %z and %Z here.
878 for (;;) {
879 const char *percent = strchrnul(fmt, '%');
880 strbuf_add(&munged_fmt, fmt, percent - fmt);
881 if (!*percent)
882 break;
883 fmt = percent + 1;
884 switch (*fmt) {
885 case '%':
886 strbuf_addstr(&munged_fmt, "%%");
887 fmt++;
888 break;
889 case 'z':
890 strbuf_addf(&munged_fmt, "%+05d", tz_offset);
891 fmt++;
892 break;
893 case 'Z':
894 if (suppress_tz_name) {
895 fmt++;
896 break;
898 /* FALLTHROUGH */
899 default:
900 strbuf_addch(&munged_fmt, '%');
903 fmt = munged_fmt.buf;
905 strbuf_grow(sb, hint);
906 len = strftime(sb->buf + sb->len, sb->alloc - sb->len, fmt, tm);
908 if (!len) {
910 * strftime reports "0" if it could not fit the result in the buffer.
911 * Unfortunately, it also reports "0" if the requested time string
912 * takes 0 bytes. So our strategy is to munge the format so that the
913 * output contains at least one character, and then drop the extra
914 * character before returning.
916 strbuf_addch(&munged_fmt, ' ');
917 while (!len) {
918 hint *= 2;
919 strbuf_grow(sb, hint);
920 len = strftime(sb->buf + sb->len, sb->alloc - sb->len,
921 munged_fmt.buf, tm);
923 len--; /* drop munged space */
925 strbuf_release(&munged_fmt);
926 strbuf_setlen(sb, sb->len + len);
929 void strbuf_add_unique_abbrev(struct strbuf *sb, const struct object_id *oid,
930 int abbrev_len)
932 int r;
933 strbuf_grow(sb, GIT_MAX_HEXSZ + 1);
934 r = find_unique_abbrev_r(sb->buf + sb->len, oid, abbrev_len);
935 strbuf_setlen(sb, sb->len + r);
939 * Returns the length of a line, without trailing spaces.
941 * If the line ends with newline, it will be removed too.
943 static size_t cleanup(char *line, size_t len)
945 while (len) {
946 unsigned char c = line[len - 1];
947 if (!isspace(c))
948 break;
949 len--;
952 return len;
956 * Remove empty lines from the beginning and end
957 * and also trailing spaces from every line.
959 * Turn multiple consecutive empty lines between paragraphs
960 * into just one empty line.
962 * If the input has only empty lines and spaces,
963 * no output will be produced.
965 * If last line does not have a newline at the end, one is added.
967 * Enable skip_comments to skip every line starting with comment
968 * character.
970 void strbuf_stripspace(struct strbuf *sb, int skip_comments)
972 size_t empties = 0;
973 size_t i, j, len, newlen;
974 char *eol;
976 /* We may have to add a newline. */
977 strbuf_grow(sb, 1);
979 for (i = j = 0; i < sb->len; i += len, j += newlen) {
980 eol = memchr(sb->buf + i, '\n', sb->len - i);
981 len = eol ? eol - (sb->buf + i) + 1 : sb->len - i;
983 if (skip_comments && len && sb->buf[i] == comment_line_char) {
984 newlen = 0;
985 continue;
987 newlen = cleanup(sb->buf + i, len);
989 /* Not just an empty line? */
990 if (newlen) {
991 if (empties > 0 && j > 0)
992 sb->buf[j++] = '\n';
993 empties = 0;
994 memmove(sb->buf + j, sb->buf + i, newlen);
995 sb->buf[newlen + j++] = '\n';
996 } else {
997 empties++;
1001 strbuf_setlen(sb, j);
1004 int strbuf_normalize_path(struct strbuf *src)
1006 struct strbuf dst = STRBUF_INIT;
1008 strbuf_grow(&dst, src->len);
1009 if (normalize_path_copy(dst.buf, src->buf) < 0) {
1010 strbuf_release(&dst);
1011 return -1;
1015 * normalize_path does not tell us the new length, so we have to
1016 * compute it by looking for the new NUL it placed
1018 strbuf_setlen(&dst, strlen(dst.buf));
1019 strbuf_swap(src, &dst);
1020 strbuf_release(&dst);
1021 return 0;