The fifth batch
[git/git.git] / strbuf.c
1 #include "cache.h"
2 #include "refs.h"
3 #include "string-list.h"
4 #include "utf8.h"
5
6 int starts_with(const char *str, const char *prefix)
7 {
8 for (; ; str++, prefix++)
9 if (!*prefix)
10 return 1;
11 else if (*str != *prefix)
12 return 0;
13 }
14
15 int istarts_with(const char *str, const char *prefix)
16 {
17 for (; ; str++, prefix++)
18 if (!*prefix)
19 return 1;
20 else if (tolower(*str) != tolower(*prefix))
21 return 0;
22 }
23
24 int skip_to_optional_arg_default(const char *str, const char *prefix,
25 const char **arg, const char *def)
26 {
27 const char *p;
28
29 if (!skip_prefix(str, prefix, &p))
30 return 0;
31
32 if (!*p) {
33 if (arg)
34 *arg = def;
35 return 1;
36 }
37
38 if (*p != '=')
39 return 0;
40
41 if (arg)
42 *arg = p + 1;
43 return 1;
44 }
45
46 /*
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.
50 */
51 char strbuf_slopbuf[1];
52
53 void strbuf_init(struct strbuf *sb, size_t hint)
54 {
55 sb->alloc = sb->len = 0;
56 sb->buf = strbuf_slopbuf;
57 if (hint)
58 strbuf_grow(sb, hint);
59 }
60
61 void strbuf_release(struct strbuf *sb)
62 {
63 if (sb->alloc) {
64 free(sb->buf);
65 strbuf_init(sb, 0);
66 }
67 }
68
69 char *strbuf_detach(struct strbuf *sb, size_t *sz)
70 {
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;
78 }
79
80 void strbuf_attach(struct strbuf *sb, void *buf, size_t len, size_t alloc)
81 {
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';
88 }
89
90 void strbuf_grow(struct strbuf *sb, size_t extra)
91 {
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';
101 }
102
103 void strbuf_trim(struct strbuf *sb)
104 {
105 strbuf_rtrim(sb);
106 strbuf_ltrim(sb);
107 }
108
109 void strbuf_rtrim(struct strbuf *sb)
110 {
111 while (sb->len > 0 && isspace((unsigned char)sb->buf[sb->len - 1]))
112 sb->len--;
113 sb->buf[sb->len] = '\0';
114 }
115
116 void strbuf_trim_trailing_dir_sep(struct strbuf *sb)
117 {
118 while (sb->len > 0 && is_dir_sep((unsigned char)sb->buf[sb->len - 1]))
119 sb->len--;
120 sb->buf[sb->len] = '\0';
121 }
122
123 void strbuf_trim_trailing_newline(struct strbuf *sb)
124 {
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';
129 }
130 }
131
132 void strbuf_ltrim(struct strbuf *sb)
133 {
134 char *b = sb->buf;
135 while (sb->len > 0 && isspace(*b)) {
136 b++;
137 sb->len--;
138 }
139 memmove(sb->buf, b, sb->len);
140 sb->buf[sb->len] = '\0';
141 }
142
143 int strbuf_reencode(struct strbuf *sb, const char *from, const char *to)
144 {
145 char *out;
146 size_t len;
147
148 if (same_encoding(from, to))
149 return 0;
150
151 out = reencode_string_len(sb->buf, sb->len, to, from, &len);
152 if (!out)
153 return -1;
154
155 strbuf_attach(sb, out, len, len);
156 return 0;
157 }
158
159 void strbuf_tolower(struct strbuf *sb)
160 {
161 char *p = sb->buf, *end = sb->buf + sb->len;
162 for (; p < end; p++)
163 *p = tolower(*p);
164 }
165
166 struct strbuf **strbuf_split_buf(const char *str, size_t slen,
167 int terminator, int max)
168 {
169 struct strbuf **ret = NULL;
170 size_t nr = 0, alloc = 0;
171 struct strbuf *t;
172
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;
179 }
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;
187 }
188 ALLOC_GROW(ret, nr + 1, alloc); /* In case string was empty */
189 ret[nr] = NULL;
190 return ret;
191 }
192
193 void strbuf_add_separated_string_list(struct strbuf *str,
194 const char *sep,
195 struct string_list *slist)
196 {
197 struct string_list_item *item;
198 int sep_needed = 0;
199
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;
205 }
206 }
207
208 void strbuf_list_free(struct strbuf **sbs)
209 {
210 struct strbuf **s = sbs;
211
212 while (*s) {
213 strbuf_release(*s);
214 free(*s++);
215 }
216 free(sbs);
217 }
218
219 int strbuf_cmp(const struct strbuf *a, const struct strbuf *b)
220 {
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;
226 }
227
228 void strbuf_splice(struct strbuf *sb, size_t pos, size_t len,
229 const void *data, size_t dlen)
230 {
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");
237
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);
245 }
246
247 void strbuf_insert(struct strbuf *sb, size_t pos, const void *data, size_t len)
248 {
249 strbuf_splice(sb, pos, 0, data, len);
250 }
251
252 void strbuf_remove(struct strbuf *sb, size_t pos, size_t len)
253 {
254 strbuf_splice(sb, pos, len, "", 0);
255 }
256
257 void strbuf_add(struct strbuf *sb, const void *data, size_t len)
258 {
259 strbuf_grow(sb, len);
260 memcpy(sb->buf + sb->len, data, len);
261 strbuf_setlen(sb, sb->len + len);
262 }
263
264 void strbuf_addbuf(struct strbuf *sb, const struct strbuf *sb2)
265 {
266 strbuf_grow(sb, sb2->len);
267 memcpy(sb->buf + sb->len, sb2->buf, sb2->len);
268 strbuf_setlen(sb, sb->len + sb2->len);
269 }
270
271 void strbuf_addchars(struct strbuf *sb, int c, size_t n)
272 {
273 strbuf_grow(sb, n);
274 memset(sb->buf + sb->len, c, n);
275 strbuf_setlen(sb, sb->len + n);
276 }
277
278 void strbuf_addf(struct strbuf *sb, const char *fmt, ...)
279 {
280 va_list ap;
281 va_start(ap, fmt);
282 strbuf_vaddf(sb, fmt, ap);
283 va_end(ap);
284 }
285
286 static void add_lines(struct strbuf *out,
287 const char *prefix1,
288 const char *prefix2,
289 const char *buf, size_t size)
290 {
291 while (size) {
292 const char *prefix;
293 const char *next = memchr(buf, '\n', size);
294 next = next ? (next + 1) : (buf + size);
295
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;
302 }
303 strbuf_complete_line(out);
304 }
305
306 void strbuf_add_commented_lines(struct strbuf *out, const char *buf, size_t size)
307 {
308 static char prefix1[3];
309 static char prefix2[2];
310
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);
314 }
315 add_lines(out, prefix1, prefix2, buf, size);
316 }
317
318 void strbuf_commented_addf(struct strbuf *sb, const char *fmt, ...)
319 {
320 va_list params;
321 struct strbuf buf = STRBUF_INIT;
322 int incomplete_line = sb->len && sb->buf[sb->len - 1] != '\n';
323
324 va_start(params, fmt);
325 strbuf_vaddf(&buf, fmt, params);
326 va_end(params);
327
328 strbuf_add_commented_lines(sb, buf.buf, buf.len);
329 if (incomplete_line)
330 sb->buf[--sb->len] = '\0';
331
332 strbuf_release(&buf);
333 }
334
335 void strbuf_vaddf(struct strbuf *sb, const char *fmt, va_list ap)
336 {
337 int len;
338 va_list cp;
339
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)");
352 }
353 strbuf_setlen(sb, sb->len + len);
354 }
355
356 void strbuf_expand(struct strbuf *sb, const char *format, expand_fn_t fn,
357 void *context)
358 {
359 for (;;) {
360 const char *percent;
361 size_t consumed;
362
363 percent = strchrnul(format, '%');
364 strbuf_add(sb, format, percent - format);
365 if (!*percent)
366 break;
367 format = percent + 1;
368
369 if (*format == '%') {
370 strbuf_addch(sb, '%');
371 format++;
372 continue;
373 }
374
375 consumed = fn(sb, format, context);
376 if (consumed)
377 format += consumed;
378 else
379 strbuf_addch(sb, '%');
380 }
381 }
382
383 size_t strbuf_expand_literal_cb(struct strbuf *sb,
384 const char *placeholder,
385 void *context)
386 {
387 int ch;
388
389 switch (placeholder[0]) {
390 case 'n': /* newline */
391 strbuf_addch(sb, '\n');
392 return 1;
393 case 'x':
394 /* %x00 == NUL, %x0a == LF, etc. */
395 ch = hex2chr(placeholder + 1);
396 if (ch < 0)
397 return 0;
398 strbuf_addch(sb, ch);
399 return 3;
400 }
401 return 0;
402 }
403
404 size_t strbuf_expand_dict_cb(struct strbuf *sb, const char *placeholder,
405 void *context)
406 {
407 struct strbuf_expand_dict_entry *e = context;
408 size_t len;
409
410 for (; e->placeholder && (len = strlen(e->placeholder)); e++) {
411 if (!strncmp(placeholder, e->placeholder, len)) {
412 if (e->value)
413 strbuf_addstr(sb, e->value);
414 return len;
415 }
416 }
417 return 0;
418 }
419
420 void strbuf_addbuf_percentquote(struct strbuf *dst, const struct strbuf *src)
421 {
422 size_t i, len = src->len;
423
424 for (i = 0; i < len; i++) {
425 if (src->buf[i] == '%')
426 strbuf_addch(dst, '%');
427 strbuf_addch(dst, src->buf[i]);
428 }
429 }
430
431 size_t strbuf_fread(struct strbuf *sb, size_t size, FILE *f)
432 {
433 size_t res;
434 size_t oldalloc = sb->alloc;
435
436 strbuf_grow(sb, size);
437 res = fread(sb->buf + sb->len, 1, size, f);
438 if (res > 0)
439 strbuf_setlen(sb, sb->len + res);
440 else if (oldalloc == 0)
441 strbuf_release(sb);
442 return res;
443 }
444
445 ssize_t strbuf_read(struct strbuf *sb, int fd, size_t hint)
446 {
447 size_t oldlen = sb->len;
448 size_t oldalloc = sb->alloc;
449
450 strbuf_grow(sb, hint ? hint : 8192);
451 for (;;) {
452 ssize_t want = sb->alloc - sb->len - 1;
453 ssize_t got = read_in_full(fd, sb->buf + sb->len, want);
454
455 if (got < 0) {
456 if (oldalloc == 0)
457 strbuf_release(sb);
458 else
459 strbuf_setlen(sb, oldlen);
460 return -1;
461 }
462 sb->len += got;
463 if (got < want)
464 break;
465 strbuf_grow(sb, 8192);
466 }
467
468 sb->buf[sb->len] = '\0';
469 return sb->len - oldlen;
470 }
471
472 ssize_t strbuf_read_once(struct strbuf *sb, int fd, size_t hint)
473 {
474 size_t oldalloc = sb->alloc;
475 ssize_t cnt;
476
477 strbuf_grow(sb, hint ? hint : 8192);
478 cnt = xread(fd, sb->buf + sb->len, sb->alloc - sb->len - 1);
479 if (cnt > 0)
480 strbuf_setlen(sb, sb->len + cnt);
481 else if (oldalloc == 0)
482 strbuf_release(sb);
483 return cnt;
484 }
485
486 ssize_t strbuf_write(struct strbuf *sb, FILE *f)
487 {
488 return sb->len ? fwrite(sb->buf, 1, sb->len, f) : 0;
489 }
490
491
492 #define STRBUF_MAXLINK (2*PATH_MAX)
493
494 int strbuf_readlink(struct strbuf *sb, const char *path, size_t hint)
495 {
496 size_t oldalloc = sb->alloc;
497
498 if (hint < 32)
499 hint = 32;
500
501 while (hint < STRBUF_MAXLINK) {
502 ssize_t len;
503
504 strbuf_grow(sb, hint);
505 len = readlink(path, sb->buf, hint);
506 if (len < 0) {
507 if (errno != ERANGE)
508 break;
509 } else if (len < hint) {
510 strbuf_setlen(sb, len);
511 return 0;
512 }
513
514 /* .. the buffer was too small - try again */
515 hint *= 2;
516 }
517 if (oldalloc == 0)
518 strbuf_release(sb);
519 return -1;
520 }
521
522 int strbuf_getcwd(struct strbuf *sb)
523 {
524 size_t oldalloc = sb->alloc;
525 size_t guessed_len = 128;
526
527 for (;; guessed_len *= 2) {
528 strbuf_grow(sb, guessed_len);
529 if (getcwd(sb->buf, sb->alloc)) {
530 strbuf_setlen(sb, strlen(sb->buf));
531 return 0;
532 }
533
534 /*
535 * If getcwd(3) is implemented as a syscall that falls
536 * back to a regular lookup using readdir(3) etc. then
537 * we may be able to avoid EACCES by providing enough
538 * space to the syscall as it's not necessarily bound
539 * to the same restrictions as the fallback.
540 */
541 if (errno == EACCES && guessed_len < PATH_MAX)
542 continue;
543
544 if (errno != ERANGE)
545 break;
546 }
547 if (oldalloc == 0)
548 strbuf_release(sb);
549 else
550 strbuf_reset(sb);
551 return -1;
552 }
553
554 #ifdef HAVE_GETDELIM
555 int strbuf_getwholeline(struct strbuf *sb, FILE *fp, int term)
556 {
557 ssize_t r;
558
559 if (feof(fp))
560 return EOF;
561
562 strbuf_reset(sb);
563
564 /* Translate slopbuf to NULL, as we cannot call realloc on it */
565 if (!sb->alloc)
566 sb->buf = NULL;
567 errno = 0;
568 r = getdelim(&sb->buf, &sb->alloc, term, fp);
569
570 if (r > 0) {
571 sb->len = r;
572 return 0;
573 }
574 assert(r == -1);
575
576 /*
577 * Normally we would have called xrealloc, which will try to free
578 * memory and recover. But we have no way to tell getdelim() to do so.
579 * Worse, we cannot try to recover ENOMEM ourselves, because we have
580 * no idea how many bytes were read by getdelim.
581 *
582 * Dying here is reasonable. It mirrors what xrealloc would do on
583 * catastrophic memory failure. We skip the opportunity to free pack
584 * memory and retry, but that's unlikely to help for a malloc small
585 * enough to hold a single line of input, anyway.
586 */
587 if (errno == ENOMEM)
588 die("Out of memory, getdelim failed");
589
590 /*
591 * Restore strbuf invariants; if getdelim left us with a NULL pointer,
592 * we can just re-init, but otherwise we should make sure that our
593 * length is empty, and that the result is NUL-terminated.
594 */
595 if (!sb->buf)
596 strbuf_init(sb, 0);
597 else
598 strbuf_reset(sb);
599 return EOF;
600 }
601 #else
602 int strbuf_getwholeline(struct strbuf *sb, FILE *fp, int term)
603 {
604 int ch;
605
606 if (feof(fp))
607 return EOF;
608
609 strbuf_reset(sb);
610 flockfile(fp);
611 while ((ch = getc_unlocked(fp)) != EOF) {
612 if (!strbuf_avail(sb))
613 strbuf_grow(sb, 1);
614 sb->buf[sb->len++] = ch;
615 if (ch == term)
616 break;
617 }
618 funlockfile(fp);
619 if (ch == EOF && sb->len == 0)
620 return EOF;
621
622 sb->buf[sb->len] = '\0';
623 return 0;
624 }
625 #endif
626
627 static int strbuf_getdelim(struct strbuf *sb, FILE *fp, int term)
628 {
629 if (strbuf_getwholeline(sb, fp, term))
630 return EOF;
631 if (sb->buf[sb->len - 1] == term)
632 strbuf_setlen(sb, sb->len - 1);
633 return 0;
634 }
635
636 int strbuf_getline(struct strbuf *sb, FILE *fp)
637 {
638 if (strbuf_getwholeline(sb, fp, '\n'))
639 return EOF;
640 if (sb->buf[sb->len - 1] == '\n') {
641 strbuf_setlen(sb, sb->len - 1);
642 if (sb->len && sb->buf[sb->len - 1] == '\r')
643 strbuf_setlen(sb, sb->len - 1);
644 }
645 return 0;
646 }
647
648 int strbuf_getline_lf(struct strbuf *sb, FILE *fp)
649 {
650 return strbuf_getdelim(sb, fp, '\n');
651 }
652
653 int strbuf_getline_nul(struct strbuf *sb, FILE *fp)
654 {
655 return strbuf_getdelim(sb, fp, '\0');
656 }
657
658 int strbuf_getwholeline_fd(struct strbuf *sb, int fd, int term)
659 {
660 strbuf_reset(sb);
661
662 while (1) {
663 char ch;
664 ssize_t len = xread(fd, &ch, 1);
665 if (len <= 0)
666 return EOF;
667 strbuf_addch(sb, ch);
668 if (ch == term)
669 break;
670 }
671 return 0;
672 }
673
674 ssize_t strbuf_read_file(struct strbuf *sb, const char *path, size_t hint)
675 {
676 int fd;
677 ssize_t len;
678 int saved_errno;
679
680 fd = open(path, O_RDONLY);
681 if (fd < 0)
682 return -1;
683 len = strbuf_read(sb, fd, hint);
684 saved_errno = errno;
685 close(fd);
686 if (len < 0) {
687 errno = saved_errno;
688 return -1;
689 }
690
691 return len;
692 }
693
694 void strbuf_add_lines(struct strbuf *out, const char *prefix,
695 const char *buf, size_t size)
696 {
697 add_lines(out, prefix, NULL, buf, size);
698 }
699
700 void strbuf_addstr_xml_quoted(struct strbuf *buf, const char *s)
701 {
702 while (*s) {
703 size_t len = strcspn(s, "\"<>&");
704 strbuf_add(buf, s, len);
705 s += len;
706 switch (*s) {
707 case '"':
708 strbuf_addstr(buf, "&quot;");
709 break;
710 case '<':
711 strbuf_addstr(buf, "&lt;");
712 break;
713 case '>':
714 strbuf_addstr(buf, "&gt;");
715 break;
716 case '&':
717 strbuf_addstr(buf, "&amp;");
718 break;
719 case 0:
720 return;
721 }
722 s++;
723 }
724 }
725
726 static int is_rfc3986_reserved(char ch)
727 {
728 switch (ch) {
729 case '!': case '*': case '\'': case '(': case ')': case ';':
730 case ':': case '@': case '&': case '=': case '+': case '$':
731 case ',': case '/': case '?': case '#': case '[': case ']':
732 return 1;
733 }
734 return 0;
735 }
736
737 static int is_rfc3986_unreserved(char ch)
738 {
739 return isalnum(ch) ||
740 ch == '-' || ch == '_' || ch == '.' || ch == '~';
741 }
742
743 static void strbuf_add_urlencode(struct strbuf *sb, const char *s, size_t len,
744 int reserved)
745 {
746 strbuf_grow(sb, len);
747 while (len--) {
748 char ch = *s++;
749 if (is_rfc3986_unreserved(ch) ||
750 (!reserved && is_rfc3986_reserved(ch)))
751 strbuf_addch(sb, ch);
752 else
753 strbuf_addf(sb, "%%%02x", (unsigned char)ch);
754 }
755 }
756
757 void strbuf_addstr_urlencode(struct strbuf *sb, const char *s,
758 int reserved)
759 {
760 strbuf_add_urlencode(sb, s, strlen(s), reserved);
761 }
762
763 void strbuf_humanise_bytes(struct strbuf *buf, off_t bytes)
764 {
765 if (bytes > 1 << 30) {
766 strbuf_addf(buf, "%u.%2.2u GiB",
767 (unsigned)(bytes >> 30),
768 (unsigned)(bytes & ((1 << 30) - 1)) / 10737419);
769 } else if (bytes > 1 << 20) {
770 unsigned x = bytes + 5243; /* for rounding */
771 strbuf_addf(buf, "%u.%2.2u MiB",
772 x >> 20, ((x & ((1 << 20) - 1)) * 100) >> 20);
773 } else if (bytes > 1 << 10) {
774 unsigned x = bytes + 5; /* for rounding */
775 strbuf_addf(buf, "%u.%2.2u KiB",
776 x >> 10, ((x & ((1 << 10) - 1)) * 100) >> 10);
777 } else {
778 strbuf_addf(buf, "%u bytes", (unsigned)bytes);
779 }
780 }
781
782 void strbuf_add_absolute_path(struct strbuf *sb, const char *path)
783 {
784 if (!*path)
785 die("The empty string is not a valid path");
786 if (!is_absolute_path(path)) {
787 struct stat cwd_stat, pwd_stat;
788 size_t orig_len = sb->len;
789 char *cwd = xgetcwd();
790 char *pwd = getenv("PWD");
791 if (pwd && strcmp(pwd, cwd) &&
792 !stat(cwd, &cwd_stat) &&
793 (cwd_stat.st_dev || cwd_stat.st_ino) &&
794 !stat(pwd, &pwd_stat) &&
795 pwd_stat.st_dev == cwd_stat.st_dev &&
796 pwd_stat.st_ino == cwd_stat.st_ino)
797 strbuf_addstr(sb, pwd);
798 else
799 strbuf_addstr(sb, cwd);
800 if (sb->len > orig_len && !is_dir_sep(sb->buf[sb->len - 1]))
801 strbuf_addch(sb, '/');
802 free(cwd);
803 }
804 strbuf_addstr(sb, path);
805 }
806
807 void strbuf_add_real_path(struct strbuf *sb, const char *path)
808 {
809 if (sb->len) {
810 struct strbuf resolved = STRBUF_INIT;
811 strbuf_realpath(&resolved, path, 1);
812 strbuf_addbuf(sb, &resolved);
813 strbuf_release(&resolved);
814 } else
815 strbuf_realpath(sb, path, 1);
816 }
817
818 int printf_ln(const char *fmt, ...)
819 {
820 int ret;
821 va_list ap;
822 va_start(ap, fmt);
823 ret = vprintf(fmt, ap);
824 va_end(ap);
825 if (ret < 0 || putchar('\n') == EOF)
826 return -1;
827 return ret + 1;
828 }
829
830 int fprintf_ln(FILE *fp, const char *fmt, ...)
831 {
832 int ret;
833 va_list ap;
834 va_start(ap, fmt);
835 ret = vfprintf(fp, fmt, ap);
836 va_end(ap);
837 if (ret < 0 || putc('\n', fp) == EOF)
838 return -1;
839 return ret + 1;
840 }
841
842 char *xstrdup_tolower(const char *string)
843 {
844 char *result;
845 size_t len, i;
846
847 len = strlen(string);
848 result = xmallocz(len);
849 for (i = 0; i < len; i++)
850 result[i] = tolower(string[i]);
851 return result;
852 }
853
854 char *xstrdup_toupper(const char *string)
855 {
856 char *result;
857 size_t len, i;
858
859 len = strlen(string);
860 result = xmallocz(len);
861 for (i = 0; i < len; i++)
862 result[i] = toupper(string[i]);
863 return result;
864 }
865
866 char *xstrvfmt(const char *fmt, va_list ap)
867 {
868 struct strbuf buf = STRBUF_INIT;
869 strbuf_vaddf(&buf, fmt, ap);
870 return strbuf_detach(&buf, NULL);
871 }
872
873 char *xstrfmt(const char *fmt, ...)
874 {
875 va_list ap;
876 char *ret;
877
878 va_start(ap, fmt);
879 ret = xstrvfmt(fmt, ap);
880 va_end(ap);
881
882 return ret;
883 }
884
885 void strbuf_addftime(struct strbuf *sb, const char *fmt, const struct tm *tm,
886 int tz_offset, int suppress_tz_name)
887 {
888 struct strbuf munged_fmt = STRBUF_INIT;
889 size_t hint = 128;
890 size_t len;
891
892 if (!*fmt)
893 return;
894
895 /*
896 * There is no portable way to pass timezone information to
897 * strftime, so we handle %z and %Z here.
898 */
899 for (;;) {
900 const char *percent = strchrnul(fmt, '%');
901 strbuf_add(&munged_fmt, fmt, percent - fmt);
902 if (!*percent)
903 break;
904 fmt = percent + 1;
905 switch (*fmt) {
906 case '%':
907 strbuf_addstr(&munged_fmt, "%%");
908 fmt++;
909 break;
910 case 'z':
911 strbuf_addf(&munged_fmt, "%+05d", tz_offset);
912 fmt++;
913 break;
914 case 'Z':
915 if (suppress_tz_name) {
916 fmt++;
917 break;
918 }
919 /* FALLTHROUGH */
920 default:
921 strbuf_addch(&munged_fmt, '%');
922 }
923 }
924 fmt = munged_fmt.buf;
925
926 strbuf_grow(sb, hint);
927 len = strftime(sb->buf + sb->len, sb->alloc - sb->len, fmt, tm);
928
929 if (!len) {
930 /*
931 * strftime reports "0" if it could not fit the result in the buffer.
932 * Unfortunately, it also reports "0" if the requested time string
933 * takes 0 bytes. So our strategy is to munge the format so that the
934 * output contains at least one character, and then drop the extra
935 * character before returning.
936 */
937 strbuf_addch(&munged_fmt, ' ');
938 while (!len) {
939 hint *= 2;
940 strbuf_grow(sb, hint);
941 len = strftime(sb->buf + sb->len, sb->alloc - sb->len,
942 munged_fmt.buf, tm);
943 }
944 len--; /* drop munged space */
945 }
946 strbuf_release(&munged_fmt);
947 strbuf_setlen(sb, sb->len + len);
948 }
949
950 void strbuf_add_unique_abbrev(struct strbuf *sb, const struct object_id *oid,
951 int abbrev_len)
952 {
953 int r;
954 strbuf_grow(sb, GIT_MAX_HEXSZ + 1);
955 r = find_unique_abbrev_r(sb->buf + sb->len, oid, abbrev_len);
956 strbuf_setlen(sb, sb->len + r);
957 }
958
959 /*
960 * Returns the length of a line, without trailing spaces.
961 *
962 * If the line ends with newline, it will be removed too.
963 */
964 static size_t cleanup(char *line, size_t len)
965 {
966 while (len) {
967 unsigned char c = line[len - 1];
968 if (!isspace(c))
969 break;
970 len--;
971 }
972
973 return len;
974 }
975
976 /*
977 * Remove empty lines from the beginning and end
978 * and also trailing spaces from every line.
979 *
980 * Turn multiple consecutive empty lines between paragraphs
981 * into just one empty line.
982 *
983 * If the input has only empty lines and spaces,
984 * no output will be produced.
985 *
986 * If last line does not have a newline at the end, one is added.
987 *
988 * Enable skip_comments to skip every line starting with comment
989 * character.
990 */
991 void strbuf_stripspace(struct strbuf *sb, int skip_comments)
992 {
993 size_t empties = 0;
994 size_t i, j, len, newlen;
995 char *eol;
996
997 /* We may have to add a newline. */
998 strbuf_grow(sb, 1);
999
1000 for (i = j = 0; i < sb->len; i += len, j += newlen) {
1001 eol = memchr(sb->buf + i, '\n', sb->len - i);
1002 len = eol ? eol - (sb->buf + i) + 1 : sb->len - i;
1003
1004 if (skip_comments && len && sb->buf[i] == comment_line_char) {
1005 newlen = 0;
1006 continue;
1007 }
1008 newlen = cleanup(sb->buf + i, len);
1009
1010 /* Not just an empty line? */
1011 if (newlen) {
1012 if (empties > 0 && j > 0)
1013 sb->buf[j++] = '\n';
1014 empties = 0;
1015 memmove(sb->buf + j, sb->buf + i, newlen);
1016 sb->buf[newlen + j++] = '\n';
1017 } else {
1018 empties++;
1019 }
1020 }
1021
1022 strbuf_setlen(sb, j);
1023 }
1024
1025 int strbuf_normalize_path(struct strbuf *src)
1026 {
1027 struct strbuf dst = STRBUF_INIT;
1028
1029 strbuf_grow(&dst, src->len);
1030 if (normalize_path_copy(dst.buf, src->buf) < 0) {
1031 strbuf_release(&dst);
1032 return -1;
1033 }
1034
1035 /*
1036 * normalize_path does not tell us the new length, so we have to
1037 * compute it by looking for the new NUL it placed
1038 */
1039 strbuf_setlen(&dst, strlen(dst.buf));
1040 strbuf_swap(src, &dst);
1041 strbuf_release(&dst);
1042 return 0;
1043 }