[PATCH] Compilation: zero-length array declaration.
[git/git.git] / ls-files.c
1 /*
2 * This merges the file listing in the directory cache index
3 * with the actual working directory list, and shows different
4 * combinations of the two.
5 *
6 * Copyright (C) Linus Torvalds, 2005
7 */
8 #include <dirent.h>
9 #include <fnmatch.h>
10
11 #include "cache.h"
12 #include "quote.h"
13
14 static int show_deleted = 0;
15 static int show_cached = 0;
16 static int show_others = 0;
17 static int show_ignored = 0;
18 static int show_stage = 0;
19 static int show_unmerged = 0;
20 static int show_modified = 0;
21 static int show_killed = 0;
22 static int line_terminator = '\n';
23
24 static int prefix_len = 0, prefix_offset = 0;
25 static const char *prefix = NULL;
26 static const char **pathspec = NULL;
27
28 static const char *tag_cached = "";
29 static const char *tag_unmerged = "";
30 static const char *tag_removed = "";
31 static const char *tag_other = "";
32 static const char *tag_killed = "";
33 static const char *tag_modified = "";
34
35 static const char *exclude_per_dir = NULL;
36
37 /* We maintain three exclude pattern lists:
38 * EXC_CMDL lists patterns explicitly given on the command line.
39 * EXC_DIRS lists patterns obtained from per-directory ignore files.
40 * EXC_FILE lists patterns from fallback ignore files.
41 */
42 #define EXC_CMDL 0
43 #define EXC_DIRS 1
44 #define EXC_FILE 2
45 static struct exclude_list {
46 int nr;
47 int alloc;
48 struct exclude {
49 const char *pattern;
50 const char *base;
51 int baselen;
52 } **excludes;
53 } exclude_list[3];
54
55 static void add_exclude(const char *string, const char *base,
56 int baselen, struct exclude_list *which)
57 {
58 struct exclude *x = xmalloc(sizeof (*x));
59
60 x->pattern = string;
61 x->base = base;
62 x->baselen = baselen;
63 if (which->nr == which->alloc) {
64 which->alloc = alloc_nr(which->alloc);
65 which->excludes = realloc(which->excludes,
66 which->alloc * sizeof(x));
67 }
68 which->excludes[which->nr++] = x;
69 }
70
71 static int add_excludes_from_file_1(const char *fname,
72 const char *base,
73 int baselen,
74 struct exclude_list *which)
75 {
76 int fd, i;
77 long size;
78 char *buf, *entry;
79
80 fd = open(fname, O_RDONLY);
81 if (fd < 0)
82 goto err;
83 size = lseek(fd, 0, SEEK_END);
84 if (size < 0)
85 goto err;
86 lseek(fd, 0, SEEK_SET);
87 if (size == 0) {
88 close(fd);
89 return 0;
90 }
91 buf = xmalloc(size);
92 if (read(fd, buf, size) != size)
93 goto err;
94 close(fd);
95
96 entry = buf;
97 for (i = 0; i < size; i++) {
98 if (buf[i] == '\n') {
99 if (entry != buf + i && entry[0] != '#') {
100 buf[i - (i && buf[i-1] == '\r')] = 0;
101 add_exclude(entry, base, baselen, which);
102 }
103 entry = buf + i + 1;
104 }
105 }
106 return 0;
107
108 err:
109 if (0 <= fd)
110 close(fd);
111 return -1;
112 }
113
114 static void add_excludes_from_file(const char *fname)
115 {
116 if (add_excludes_from_file_1(fname, "", 0,
117 &exclude_list[EXC_FILE]) < 0)
118 die("cannot use %s as an exclude file", fname);
119 }
120
121 static int push_exclude_per_directory(const char *base, int baselen)
122 {
123 char exclude_file[PATH_MAX];
124 struct exclude_list *el = &exclude_list[EXC_DIRS];
125 int current_nr = el->nr;
126
127 if (exclude_per_dir) {
128 memcpy(exclude_file, base, baselen);
129 strcpy(exclude_file + baselen, exclude_per_dir);
130 add_excludes_from_file_1(exclude_file, base, baselen, el);
131 }
132 return current_nr;
133 }
134
135 static void pop_exclude_per_directory(int stk)
136 {
137 struct exclude_list *el = &exclude_list[EXC_DIRS];
138
139 while (stk < el->nr)
140 free(el->excludes[--el->nr]);
141 }
142
143 /* Scan the list and let the last match determines the fate.
144 * Return 1 for exclude, 0 for include and -1 for undecided.
145 */
146 static int excluded_1(const char *pathname,
147 int pathlen,
148 struct exclude_list *el)
149 {
150 int i;
151
152 if (el->nr) {
153 for (i = el->nr - 1; 0 <= i; i--) {
154 struct exclude *x = el->excludes[i];
155 const char *exclude = x->pattern;
156 int to_exclude = 1;
157
158 if (*exclude == '!') {
159 to_exclude = 0;
160 exclude++;
161 }
162
163 if (!strchr(exclude, '/')) {
164 /* match basename */
165 const char *basename = strrchr(pathname, '/');
166 basename = (basename) ? basename+1 : pathname;
167 if (fnmatch(exclude, basename, 0) == 0)
168 return to_exclude;
169 }
170 else {
171 /* match with FNM_PATHNAME:
172 * exclude has base (baselen long) implicitly
173 * in front of it.
174 */
175 int baselen = x->baselen;
176 if (*exclude == '/')
177 exclude++;
178
179 if (pathlen < baselen ||
180 (baselen && pathname[baselen-1] != '/') ||
181 strncmp(pathname, x->base, baselen))
182 continue;
183
184 if (fnmatch(exclude, pathname+baselen,
185 FNM_PATHNAME) == 0)
186 return to_exclude;
187 }
188 }
189 }
190 return -1; /* undecided */
191 }
192
193 static int excluded(const char *pathname)
194 {
195 int pathlen = strlen(pathname);
196 int st;
197
198 for (st = EXC_CMDL; st <= EXC_FILE; st++) {
199 switch (excluded_1(pathname, pathlen, &exclude_list[st])) {
200 case 0:
201 return 0;
202 case 1:
203 return 1;
204 }
205 }
206 return 0;
207 }
208
209 struct nond_on_fs {
210 int len;
211 char name[FLEX_ARRAY]; /* more */
212 };
213
214 static struct nond_on_fs **dir;
215 static int nr_dir;
216 static int dir_alloc;
217
218 static void add_name(const char *pathname, int len)
219 {
220 struct nond_on_fs *ent;
221
222 if (cache_name_pos(pathname, len) >= 0)
223 return;
224
225 if (nr_dir == dir_alloc) {
226 dir_alloc = alloc_nr(dir_alloc);
227 dir = xrealloc(dir, dir_alloc*sizeof(ent));
228 }
229 ent = xmalloc(sizeof(*ent) + len + 1);
230 ent->len = len;
231 memcpy(ent->name, pathname, len);
232 ent->name[len] = 0;
233 dir[nr_dir++] = ent;
234 }
235
236 /*
237 * Read a directory tree. We currently ignore anything but
238 * directories, regular files and symlinks. That's because git
239 * doesn't handle them at all yet. Maybe that will change some
240 * day.
241 *
242 * Also, we ignore the name ".git" (even if it is not a directory).
243 * That likely will not change.
244 */
245 static void read_directory(const char *path, const char *base, int baselen)
246 {
247 DIR *dir = opendir(path);
248
249 if (dir) {
250 int exclude_stk;
251 struct dirent *de;
252 char fullname[MAXPATHLEN + 1];
253 memcpy(fullname, base, baselen);
254
255 exclude_stk = push_exclude_per_directory(base, baselen);
256
257 while ((de = readdir(dir)) != NULL) {
258 int len;
259
260 if ((de->d_name[0] == '.') &&
261 (de->d_name[1] == 0 ||
262 !strcmp(de->d_name + 1, ".") ||
263 !strcmp(de->d_name + 1, "git")))
264 continue;
265 len = strlen(de->d_name);
266 memcpy(fullname + baselen, de->d_name, len+1);
267 if (excluded(fullname) != show_ignored)
268 continue;
269
270 switch (DTYPE(de)) {
271 struct stat st;
272 default:
273 continue;
274 case DT_UNKNOWN:
275 if (lstat(fullname, &st))
276 continue;
277 if (S_ISREG(st.st_mode) || S_ISLNK(st.st_mode))
278 break;
279 if (!S_ISDIR(st.st_mode))
280 continue;
281 /* fallthrough */
282 case DT_DIR:
283 memcpy(fullname + baselen + len, "/", 2);
284 read_directory(fullname, fullname,
285 baselen + len + 1);
286 continue;
287 case DT_REG:
288 case DT_LNK:
289 break;
290 }
291 add_name(fullname, baselen + len);
292 }
293 closedir(dir);
294
295 pop_exclude_per_directory(exclude_stk);
296 }
297 }
298
299 static int cmp_name(const void *p1, const void *p2)
300 {
301 const struct nond_on_fs *e1 = *(const struct nond_on_fs **)p1;
302 const struct nond_on_fs *e2 = *(const struct nond_on_fs **)p2;
303
304 return cache_name_compare(e1->name, e1->len,
305 e2->name, e2->len);
306 }
307
308 /*
309 * Match a pathspec against a filename. The first "len" characters
310 * are the common prefix
311 */
312 static int match(const char **spec, const char *filename, int len)
313 {
314 const char *m;
315
316 while ((m = *spec++) != NULL) {
317 int matchlen = strlen(m + len);
318
319 if (!matchlen)
320 return 1;
321 if (!strncmp(m + len, filename + len, matchlen)) {
322 if (m[len + matchlen - 1] == '/')
323 return 1;
324 switch (filename[len + matchlen]) {
325 case '/': case '\0':
326 return 1;
327 }
328 }
329 if (!fnmatch(m + len, filename + len, 0))
330 return 1;
331 }
332 return 0;
333 }
334
335 static void show_dir_entry(const char *tag, struct nond_on_fs *ent)
336 {
337 int len = prefix_len;
338 int offset = prefix_offset;
339
340 if (len >= ent->len)
341 die("git-ls-files: internal error - directory entry not superset of prefix");
342
343 if (pathspec && !match(pathspec, ent->name, len))
344 return;
345
346 fputs(tag, stdout);
347 write_name_quoted("", 0, ent->name + offset, line_terminator, stdout);
348 putchar(line_terminator);
349 }
350
351 static void show_other_files(void)
352 {
353 int i;
354 for (i = 0; i < nr_dir; i++) {
355 /* We should not have a matching entry, but we
356 * may have an unmerged entry for this path.
357 */
358 struct nond_on_fs *ent = dir[i];
359 int pos = cache_name_pos(ent->name, ent->len);
360 struct cache_entry *ce;
361 if (0 <= pos)
362 die("bug in show-other-files");
363 pos = -pos - 1;
364 if (pos < active_nr) {
365 ce = active_cache[pos];
366 if (ce_namelen(ce) == ent->len &&
367 !memcmp(ce->name, ent->name, ent->len))
368 continue; /* Yup, this one exists unmerged */
369 }
370 show_dir_entry(tag_other, ent);
371 }
372 }
373
374 static void show_killed_files(void)
375 {
376 int i;
377 for (i = 0; i < nr_dir; i++) {
378 struct nond_on_fs *ent = dir[i];
379 char *cp, *sp;
380 int pos, len, killed = 0;
381
382 for (cp = ent->name; cp - ent->name < ent->len; cp = sp + 1) {
383 sp = strchr(cp, '/');
384 if (!sp) {
385 /* If ent->name is prefix of an entry in the
386 * cache, it will be killed.
387 */
388 pos = cache_name_pos(ent->name, ent->len);
389 if (0 <= pos)
390 die("bug in show-killed-files");
391 pos = -pos - 1;
392 while (pos < active_nr &&
393 ce_stage(active_cache[pos]))
394 pos++; /* skip unmerged */
395 if (active_nr <= pos)
396 break;
397 /* pos points at a name immediately after
398 * ent->name in the cache. Does it expect
399 * ent->name to be a directory?
400 */
401 len = ce_namelen(active_cache[pos]);
402 if ((ent->len < len) &&
403 !strncmp(active_cache[pos]->name,
404 ent->name, ent->len) &&
405 active_cache[pos]->name[ent->len] == '/')
406 killed = 1;
407 break;
408 }
409 if (0 <= cache_name_pos(ent->name, sp - ent->name)) {
410 /* If any of the leading directories in
411 * ent->name is registered in the cache,
412 * ent->name will be killed.
413 */
414 killed = 1;
415 break;
416 }
417 }
418 if (killed)
419 show_dir_entry(tag_killed, dir[i]);
420 }
421 }
422
423 static void show_ce_entry(const char *tag, struct cache_entry *ce)
424 {
425 int len = prefix_len;
426 int offset = prefix_offset;
427
428 if (len >= ce_namelen(ce))
429 die("git-ls-files: internal error - cache entry not superset of prefix");
430
431 if (pathspec && !match(pathspec, ce->name, len))
432 return;
433
434 if (!show_stage) {
435 fputs(tag, stdout);
436 write_name_quoted("", 0, ce->name + offset,
437 line_terminator, stdout);
438 putchar(line_terminator);
439 }
440 else {
441 printf("%s%06o %s %d\t",
442 tag,
443 ntohl(ce->ce_mode),
444 sha1_to_hex(ce->sha1),
445 ce_stage(ce));
446 write_name_quoted("", 0, ce->name + offset,
447 line_terminator, stdout);
448 putchar(line_terminator);
449 }
450 }
451
452 static void show_files(void)
453 {
454 int i;
455
456 /* For cached/deleted files we don't need to even do the readdir */
457 if (show_others || show_killed) {
458 const char *path = ".", *base = "";
459 int baselen = prefix_len;
460
461 if (baselen)
462 path = base = prefix;
463 read_directory(path, base, baselen);
464 qsort(dir, nr_dir, sizeof(struct nond_on_fs *), cmp_name);
465 if (show_others)
466 show_other_files();
467 if (show_killed)
468 show_killed_files();
469 }
470 if (show_cached | show_stage) {
471 for (i = 0; i < active_nr; i++) {
472 struct cache_entry *ce = active_cache[i];
473 if (excluded(ce->name) != show_ignored)
474 continue;
475 if (show_unmerged && !ce_stage(ce))
476 continue;
477 show_ce_entry(ce_stage(ce) ? tag_unmerged : tag_cached, ce);
478 }
479 }
480 if (show_deleted | show_modified) {
481 for (i = 0; i < active_nr; i++) {
482 struct cache_entry *ce = active_cache[i];
483 struct stat st;
484 int err;
485 if (excluded(ce->name) != show_ignored)
486 continue;
487 err = lstat(ce->name, &st);
488 if (show_deleted && err)
489 show_ce_entry(tag_removed, ce);
490 if (show_modified && ce_modified(ce, &st))
491 show_ce_entry(tag_modified, ce);
492 }
493 }
494 }
495
496 /*
497 * Prune the index to only contain stuff starting with "prefix"
498 */
499 static void prune_cache(void)
500 {
501 int pos = cache_name_pos(prefix, prefix_len);
502 unsigned int first, last;
503
504 if (pos < 0)
505 pos = -pos-1;
506 active_cache += pos;
507 active_nr -= pos;
508 first = 0;
509 last = active_nr;
510 while (last > first) {
511 int next = (last + first) >> 1;
512 struct cache_entry *ce = active_cache[next];
513 if (!strncmp(ce->name, prefix, prefix_len)) {
514 first = next+1;
515 continue;
516 }
517 last = next;
518 }
519 active_nr = last;
520 }
521
522 static void verify_pathspec(void)
523 {
524 const char **p, *n, *prev;
525 char *real_prefix;
526 unsigned long max;
527
528 prev = NULL;
529 max = PATH_MAX;
530 for (p = pathspec; (n = *p) != NULL; p++) {
531 int i, len = 0;
532 for (i = 0; i < max; i++) {
533 char c = n[i];
534 if (prev && prev[i] != c)
535 break;
536 if (!c || c == '*' || c == '?')
537 break;
538 if (c == '/')
539 len = i+1;
540 }
541 prev = n;
542 if (len < max) {
543 max = len;
544 if (!max)
545 break;
546 }
547 }
548
549 if (prefix_offset > max || memcmp(prev, prefix, prefix_offset))
550 die("git-ls-files: cannot generate relative filenames containing '..'");
551
552 real_prefix = NULL;
553 prefix_len = max;
554 if (max) {
555 real_prefix = xmalloc(max + 1);
556 memcpy(real_prefix, prev, max);
557 real_prefix[max] = 0;
558 }
559 prefix = real_prefix;
560 }
561
562 static const char ls_files_usage[] =
563 "git-ls-files [-z] [-t] (--[cached|deleted|others|stage|unmerged|killed|modified])* "
564 "[ --ignored ] [--exclude=<pattern>] [--exclude-from=<file>] "
565 "[ --exclude-per-directory=<filename> ] [--full-name] [--] [<file>]*";
566
567 int main(int argc, const char **argv)
568 {
569 int i;
570 int exc_given = 0;
571
572 prefix = setup_git_directory();
573 if (prefix)
574 prefix_offset = strlen(prefix);
575 git_config(git_default_config);
576
577 for (i = 1; i < argc; i++) {
578 const char *arg = argv[i];
579
580 if (!strcmp(arg, "--")) {
581 i++;
582 break;
583 }
584 if (!strcmp(arg, "-z")) {
585 line_terminator = 0;
586 continue;
587 }
588 if (!strcmp(arg, "-t")) {
589 tag_cached = "H ";
590 tag_unmerged = "M ";
591 tag_removed = "R ";
592 tag_modified = "C ";
593 tag_other = "? ";
594 tag_killed = "K ";
595 continue;
596 }
597 if (!strcmp(arg, "-c") || !strcmp(arg, "--cached")) {
598 show_cached = 1;
599 continue;
600 }
601 if (!strcmp(arg, "-d") || !strcmp(arg, "--deleted")) {
602 show_deleted = 1;
603 continue;
604 }
605 if (!strcmp(arg, "-m") || !strcmp(arg, "--modified")) {
606 show_modified = 1;
607 continue;
608 }
609 if (!strcmp(arg, "-o") || !strcmp(arg, "--others")) {
610 show_others = 1;
611 continue;
612 }
613 if (!strcmp(arg, "-i") || !strcmp(arg, "--ignored")) {
614 show_ignored = 1;
615 continue;
616 }
617 if (!strcmp(arg, "-s") || !strcmp(arg, "--stage")) {
618 show_stage = 1;
619 continue;
620 }
621 if (!strcmp(arg, "-k") || !strcmp(arg, "--killed")) {
622 show_killed = 1;
623 continue;
624 }
625 if (!strcmp(arg, "-u") || !strcmp(arg, "--unmerged")) {
626 /* There's no point in showing unmerged unless
627 * you also show the stage information.
628 */
629 show_stage = 1;
630 show_unmerged = 1;
631 continue;
632 }
633 if (!strcmp(arg, "-x") && i+1 < argc) {
634 exc_given = 1;
635 add_exclude(argv[++i], "", 0, &exclude_list[EXC_CMDL]);
636 continue;
637 }
638 if (!strncmp(arg, "--exclude=", 10)) {
639 exc_given = 1;
640 add_exclude(arg+10, "", 0, &exclude_list[EXC_CMDL]);
641 continue;
642 }
643 if (!strcmp(arg, "-X") && i+1 < argc) {
644 exc_given = 1;
645 add_excludes_from_file(argv[++i]);
646 continue;
647 }
648 if (!strncmp(arg, "--exclude-from=", 15)) {
649 exc_given = 1;
650 add_excludes_from_file(arg+15);
651 continue;
652 }
653 if (!strncmp(arg, "--exclude-per-directory=", 24)) {
654 exc_given = 1;
655 exclude_per_dir = arg + 24;
656 continue;
657 }
658 if (!strcmp(arg, "--full-name")) {
659 prefix_offset = 0;
660 continue;
661 }
662 if (*arg == '-')
663 usage(ls_files_usage);
664 break;
665 }
666
667 pathspec = get_pathspec(prefix, argv + i);
668
669 /* Verify that the pathspec matches the prefix */
670 if (pathspec)
671 verify_pathspec();
672
673 if (show_ignored && !exc_given) {
674 fprintf(stderr, "%s: --ignored needs some exclude pattern\n",
675 argv[0]);
676 exit(1);
677 }
678
679 /* With no flags, we default to showing the cached files */
680 if (!(show_stage | show_deleted | show_others | show_unmerged |
681 show_killed | show_modified))
682 show_cached = 1;
683
684 read_cache();
685 if (prefix)
686 prune_cache();
687 show_files();
688 return 0;
689 }