convert trivial cases to ALLOC_ARRAY
[git/git.git] / attr.c
CommitLineData
86ab7f0c
MH
1/*
2 * Handle git attributes. See gitattributes(5) for a description of
3 * the file syntax, and Documentation/technical/api-gitattributes.txt
4 * for a description of the API.
5 *
6 * One basic design decision here is that we are not going to support
7 * an insanely large number of attributes.
8 */
9
06f33c17 10#define NO_THE_INDEX_COMPATIBILITY_MACROS
d0bfd026 11#include "cache.h"
6df42ab9 12#include "exec_cmd.h"
d0bfd026 13#include "attr.h"
6eba6210 14#include "dir.h"
27547e5f 15#include "utf8.h"
d0bfd026 16
a5e92abd
JH
17const char git_attr__true[] = "(builtin)true";
18const char git_attr__false[] = "\0(builtin)false";
19static const char git_attr__unknown[] = "(builtin)unknown";
20#define ATTR__TRUE git_attr__true
21#define ATTR__FALSE git_attr__false
22#define ATTR__UNSET NULL
23#define ATTR__UNKNOWN git_attr__unknown
515106fa 24
86ab7f0c 25/* This is a randomly chosen prime. */
d0bfd026
JH
26#define HASHSIZE 257
27
28#ifndef DEBUG_ATTR
29#define DEBUG_ATTR 0
30#endif
31
32struct git_attr {
33 struct git_attr *next;
34 unsigned h;
f48fd688 35 int attr_nr;
fad32bcd 36 int maybe_macro;
06a604e6 37 int maybe_real;
d0bfd026
JH
38 char name[FLEX_ARRAY];
39};
f48fd688 40static int attr_nr;
06a604e6 41static int cannot_trust_maybe_real;
d0bfd026 42
f48fd688 43static struct git_attr_check *check_all_attr;
d0bfd026
JH
44static struct git_attr *(git_attr_hash[HASHSIZE]);
45
352404ac
MH
46char *git_attr_name(struct git_attr *attr)
47{
48 return attr->name;
49}
50
d0bfd026
JH
51static unsigned hash_name(const char *name, int namelen)
52{
48fb7deb 53 unsigned val = 0, c;
d0bfd026
JH
54
55 while (namelen--) {
56 c = *name++;
57 val = ((val << 7) | (val >> 22)) ^ c;
58 }
59 return val;
60}
61
e4aee10a
JH
62static int invalid_attr_name(const char *name, int namelen)
63{
64 /*
d42453ab
MH
65 * Attribute name cannot begin with '-' and must consist of
66 * characters from [-A-Za-z0-9_.].
e4aee10a 67 */
c0b13b21 68 if (namelen <= 0 || *name == '-')
e4aee10a
JH
69 return -1;
70 while (namelen--) {
71 char ch = *name++;
72 if (! (ch == '-' || ch == '.' || ch == '_' ||
73 ('0' <= ch && ch <= '9') ||
74 ('a' <= ch && ch <= 'z') ||
75 ('A' <= ch && ch <= 'Z')) )
76 return -1;
77 }
78 return 0;
79}
80
7fb0eaa2 81static struct git_attr *git_attr_internal(const char *name, int len)
d0bfd026
JH
82{
83 unsigned hval = hash_name(name, len);
84 unsigned pos = hval % HASHSIZE;
85 struct git_attr *a;
86
87 for (a = git_attr_hash[pos]; a; a = a->next) {
88 if (a->h == hval &&
89 !memcmp(a->name, name, len) && !a->name[len])
90 return a;
91 }
92
e4aee10a
JH
93 if (invalid_attr_name(name, len))
94 return NULL;
95
d0bfd026
JH
96 a = xmalloc(sizeof(*a) + len + 1);
97 memcpy(a->name, name, len);
98 a->name[len] = 0;
99 a->h = hval;
100 a->next = git_attr_hash[pos];
f48fd688 101 a->attr_nr = attr_nr++;
fad32bcd 102 a->maybe_macro = 0;
06a604e6 103 a->maybe_real = 0;
d0bfd026 104 git_attr_hash[pos] = a;
f48fd688 105
2756ca43 106 REALLOC_ARRAY(check_all_attr, attr_nr);
f48fd688 107 check_all_attr[a->attr_nr].attr = a;
515106fa 108 check_all_attr[a->attr_nr].value = ATTR__UNKNOWN;
d0bfd026
JH
109 return a;
110}
111
7fb0eaa2
JH
112struct git_attr *git_attr(const char *name)
113{
114 return git_attr_internal(name, strlen(name));
115}
116
515106fa 117/* What does a matched pattern decide? */
d0bfd026 118struct attr_state {
d0bfd026 119 struct git_attr *attr;
a5e92abd 120 const char *setto;
d0bfd026
JH
121};
122
82dce998
NTND
123struct pattern {
124 const char *pattern;
125 int patternlen;
126 int nowildcardlen;
127 int flags; /* EXC_FLAG_* */
128};
129
ba845b75
MH
130/*
131 * One rule, as from a .gitattributes file.
132 *
133 * If is_macro is true, then u.attr is a pointer to the git_attr being
134 * defined.
135 *
136 * If is_macro is false, then u.pattern points at the filename pattern
137 * to which the rule applies. (The memory pointed to is part of the
138 * memory block allocated for the match_attr instance.)
139 *
140 * In either case, num_attr is the number of attributes affected by
141 * this rule, and state is an array listing them. The attributes are
142 * listed as they appear in the file (macros unexpanded).
143 */
d0bfd026 144struct match_attr {
f48fd688 145 union {
82dce998 146 struct pattern pat;
f48fd688
JH
147 struct git_attr *attr;
148 } u;
149 char is_macro;
d0bfd026
JH
150 unsigned num_attr;
151 struct attr_state state[FLEX_ARRAY];
152};
153
154static const char blank[] = " \t\r\n";
155
d1751298
MH
156/*
157 * Parse a whitespace-delimited attribute state (i.e., "attr",
158 * "-attr", "!attr", or "attr=value") from the string starting at src.
159 * If e is not NULL, write the results to *e. Return a pointer to the
160 * remainder of the string (with leading whitespace removed), or NULL
161 * if there was an error.
162 */
515106fa 163static const char *parse_attr(const char *src, int lineno, const char *cp,
d1751298 164 struct attr_state *e)
515106fa
JH
165{
166 const char *ep, *equals;
167 int len;
168
169 ep = cp + strcspn(cp, blank);
170 equals = strchr(cp, '=');
171 if (equals && ep < equals)
172 equals = NULL;
173 if (equals)
174 len = equals - cp;
175 else
176 len = ep - cp;
d1751298 177 if (!e) {
515106fa
JH
178 if (*cp == '-' || *cp == '!') {
179 cp++;
180 len--;
181 }
182 if (invalid_attr_name(cp, len)) {
183 fprintf(stderr,
184 "%.*s is not a valid attribute name: %s:%d\n",
185 len, cp, src, lineno);
186 return NULL;
187 }
188 } else {
515106fa
JH
189 if (*cp == '-' || *cp == '!') {
190 e->setto = (*cp == '-') ? ATTR__FALSE : ATTR__UNSET;
191 cp++;
192 len--;
193 }
194 else if (!equals)
195 e->setto = ATTR__TRUE;
196 else {
182af834 197 e->setto = xmemdupz(equals + 1, ep - equals - 1);
515106fa 198 }
7fb0eaa2 199 e->attr = git_attr_internal(cp, len);
515106fa 200 }
515106fa
JH
201 return ep + strspn(ep, blank);
202}
203
f48fd688
JH
204static struct match_attr *parse_attr_line(const char *line, const char *src,
205 int lineno, int macro_ok)
d0bfd026
JH
206{
207 int namelen;
d68e1c18 208 int num_attr, i;
85c4a0d0 209 const char *cp, *name, *states;
515106fa 210 struct match_attr *res = NULL;
f48fd688 211 int is_macro;
d0bfd026
JH
212
213 cp = line + strspn(line, blank);
214 if (!*cp || *cp == '#')
215 return NULL;
216 name = cp;
217 namelen = strcspn(name, blank);
f48fd688 218 if (strlen(ATTRIBUTE_MACRO_PREFIX) < namelen &&
59556548 219 starts_with(name, ATTRIBUTE_MACRO_PREFIX)) {
f48fd688
JH
220 if (!macro_ok) {
221 fprintf(stderr, "%s not allowed: %s:%d\n",
222 name, src, lineno);
223 return NULL;
224 }
225 is_macro = 1;
226 name += strlen(ATTRIBUTE_MACRO_PREFIX);
227 name += strspn(name, blank);
228 namelen = strcspn(name, blank);
e4aee10a
JH
229 if (invalid_attr_name(name, namelen)) {
230 fprintf(stderr,
231 "%.*s is not a valid attribute name: %s:%d\n",
232 namelen, name, src, lineno);
233 return NULL;
234 }
f48fd688
JH
235 }
236 else
237 is_macro = 0;
d0bfd026 238
85c4a0d0
MH
239 states = name + namelen;
240 states += strspn(states, blank);
241
d68e1c18
MH
242 /* First pass to count the attr_states */
243 for (cp = states, num_attr = 0; *cp; num_attr++) {
244 cp = parse_attr(src, lineno, cp, NULL);
245 if (!cp)
246 return NULL;
d0bfd026 247 }
d68e1c18
MH
248
249 res = xcalloc(1,
250 sizeof(*res) +
251 sizeof(struct attr_state) * num_attr +
252 (is_macro ? 0 : namelen + 1));
fad32bcd 253 if (is_macro) {
d68e1c18 254 res->u.attr = git_attr_internal(name, namelen);
fad32bcd
NTND
255 res->u.attr->maybe_macro = 1;
256 } else {
82dce998
NTND
257 char *p = (char *)&(res->state[num_attr]);
258 memcpy(p, name, namelen);
259 res->u.pat.pattern = p;
260 parse_exclude_pattern(&res->u.pat.pattern,
261 &res->u.pat.patternlen,
262 &res->u.pat.flags,
263 &res->u.pat.nowildcardlen);
8b1bd024
TR
264 if (res->u.pat.flags & EXC_FLAG_NEGATIVE) {
265 warning(_("Negative patterns are ignored in git attributes\n"
266 "Use '\\!' for literal leading exclamation."));
267 return NULL;
268 }
d0bfd026 269 }
d68e1c18
MH
270 res->is_macro = is_macro;
271 res->num_attr = num_attr;
272
273 /* Second pass to fill the attr_states */
274 for (cp = states, i = 0; *cp; i++) {
275 cp = parse_attr(src, lineno, cp, &(res->state[i]));
06a604e6
NTND
276 if (!is_macro)
277 res->state[i].attr->maybe_real = 1;
278 if (res->state[i].attr->maybe_macro)
279 cannot_trust_maybe_real = 1;
d68e1c18
MH
280 }
281
d0bfd026
JH
282 return res;
283}
284
285/*
286 * Like info/exclude and .gitignore, the attribute information can
287 * come from many places.
288 *
289 * (1) .gitattribute file of the same directory;
515106fa
JH
290 * (2) .gitattribute file of the parent directory if (1) does not have
291 * any match; this goes recursively upwards, just like .gitignore.
292 * (3) $GIT_DIR/info/attributes, which overrides both of the above.
d0bfd026
JH
293 *
294 * In the same file, later entries override the earlier match, so in the
295 * global list, we would have entries from info/attributes the earliest
296 * (reading the file from top to bottom), .gitattribute of the root
297 * directory (again, reading the file from top to bottom) down to the
298 * current directory, and then scan the list backwards to find the first match.
6d24e7a8 299 * This is exactly the same as what is_excluded() does in dir.c to deal with
d0bfd026
JH
300 * .gitignore
301 */
302
303static struct attr_stack {
304 struct attr_stack *prev;
305 char *origin;
cd6a0b26 306 size_t originlen;
d0bfd026 307 unsigned num_matches;
a4413118 308 unsigned alloc;
d0bfd026
JH
309 struct match_attr **attrs;
310} *attr_stack;
311
312static void free_attr_elem(struct attr_stack *e)
313{
314 int i;
315 free(e->origin);
515106fa
JH
316 for (i = 0; i < e->num_matches; i++) {
317 struct match_attr *a = e->attrs[i];
318 int j;
319 for (j = 0; j < a->num_attr; j++) {
a5e92abd 320 const char *setto = a->state[j].setto;
515106fa
JH
321 if (setto == ATTR__TRUE ||
322 setto == ATTR__FALSE ||
323 setto == ATTR__UNSET ||
324 setto == ATTR__UNKNOWN)
325 ;
326 else
4b25d091 327 free((char *) setto);
515106fa
JH
328 }
329 free(a);
330 }
37475f97 331 free(e->attrs);
d0bfd026
JH
332 free(e);
333}
334
335static const char *builtin_attr[] = {
155a4b71 336 "[attr]binary -diff -merge -text",
d0bfd026
JH
337 NULL,
338};
339
a4413118
JH
340static void handle_attr_line(struct attr_stack *res,
341 const char *line,
342 const char *src,
343 int lineno,
344 int macro_ok)
345{
346 struct match_attr *a;
347
348 a = parse_attr_line(line, src, lineno, macro_ok);
349 if (!a)
350 return;
3a7fa03d 351 ALLOC_GROW(res->attrs, res->num_matches + 1, res->alloc);
a4413118
JH
352 res->attrs[res->num_matches++] = a;
353}
354
d0bfd026
JH
355static struct attr_stack *read_attr_from_array(const char **list)
356{
357 struct attr_stack *res;
358 const char *line;
f48fd688 359 int lineno = 0;
d0bfd026
JH
360
361 res = xcalloc(1, sizeof(*res));
a4413118
JH
362 while ((line = *(list++)) != NULL)
363 handle_attr_line(res, line, "[builtin]", ++lineno, 1);
d0bfd026
JH
364 return res;
365}
366
06f33c17
JH
367static enum git_attr_direction direction;
368static struct index_state *use_index;
369
f48fd688 370static struct attr_stack *read_attr_from_file(const char *path, int macro_ok)
d0bfd026 371{
a4413118 372 FILE *fp = fopen(path, "r");
d0bfd026
JH
373 struct attr_stack *res;
374 char buf[2048];
f48fd688 375 int lineno = 0;
d0bfd026 376
11e50b27 377 if (!fp) {
8e950dab 378 if (errno != ENOENT && errno != ENOTDIR)
55b38a48 379 warn_on_inaccessible(path);
a4413118 380 return NULL;
11e50b27 381 }
a4413118 382 res = xcalloc(1, sizeof(*res));
27547e5f
JH
383 while (fgets(buf, sizeof(buf), fp)) {
384 char *bufp = buf;
385 if (!lineno)
386 skip_utf8_bom(&bufp, strlen(bufp));
387 handle_attr_line(res, bufp, path, ++lineno, macro_ok);
388 }
a4413118
JH
389 fclose(fp);
390 return res;
391}
d0bfd026 392
06f33c17 393static struct attr_stack *read_attr_from_index(const char *path, int macro_ok)
a4413118
JH
394{
395 struct attr_stack *res;
1a9d7e9b
JH
396 char *buf, *sp;
397 int lineno = 0;
f48fd688 398
ff366825 399 buf = read_blob_data_from_index(use_index ? use_index : &the_index, path, NULL);
1a9d7e9b 400 if (!buf)
06f33c17 401 return NULL;
1a9d7e9b 402
06f33c17 403 res = xcalloc(1, sizeof(*res));
1a9d7e9b
JH
404 for (sp = buf; *sp; ) {
405 char *ep;
406 int more;
407 for (ep = sp; *ep && *ep != '\n'; ep++)
408 ;
409 more = (*ep == '\n');
410 *ep = '\0';
411 handle_attr_line(res, sp, path, ++lineno, macro_ok);
412 sp = ep + more;
413 }
414 free(buf);
d0bfd026
JH
415 return res;
416}
417
06f33c17
JH
418static struct attr_stack *read_attr(const char *path, int macro_ok)
419{
420 struct attr_stack *res;
421
422 if (direction == GIT_ATTR_CHECKOUT) {
423 res = read_attr_from_index(path, macro_ok);
424 if (!res)
425 res = read_attr_from_file(path, macro_ok);
426 }
4191e80a 427 else if (direction == GIT_ATTR_CHECKIN) {
06f33c17
JH
428 res = read_attr_from_file(path, macro_ok);
429 if (!res)
430 /*
431 * There is no checked out .gitattributes file there, but
432 * we might have it in the index. We allow operation in a
433 * sparsely checked out work tree, so read from it.
434 */
435 res = read_attr_from_index(path, macro_ok);
436 }
4191e80a
NTND
437 else
438 res = read_attr_from_index(path, macro_ok);
06f33c17
JH
439 if (!res)
440 res = xcalloc(1, sizeof(*res));
441 return res;
442}
443
d0bfd026
JH
444#if DEBUG_ATTR
445static void debug_info(const char *what, struct attr_stack *elem)
446{
447 fprintf(stderr, "%s: %s\n", what, elem->origin ? elem->origin : "()");
448}
cf94ccda 449static void debug_set(const char *what, const char *match, struct git_attr *attr, const void *v)
f48fd688 450{
515106fa
JH
451 const char *value = v;
452
453 if (ATTR_TRUE(value))
454 value = "set";
455 else if (ATTR_FALSE(value))
456 value = "unset";
457 else if (ATTR_UNSET(value))
458 value = "unspecified";
459
460 fprintf(stderr, "%s: %s => %s (%s)\n",
461 what, attr->name, (char *) value, match);
f48fd688 462}
d0bfd026
JH
463#define debug_push(a) debug_info("push", (a))
464#define debug_pop(a) debug_info("pop", (a))
465#else
466#define debug_push(a) do { ; } while (0)
467#define debug_pop(a) do { ; } while (0)
f48fd688 468#define debug_set(a,b,c,d) do { ; } while (0)
d0bfd026
JH
469#endif
470
06f33c17
JH
471static void drop_attr_stack(void)
472{
473 while (attr_stack) {
474 struct attr_stack *elem = attr_stack;
475 attr_stack = elem->prev;
476 free_attr_elem(elem);
477 }
478}
479
c5147722 480static const char *git_etc_gitattributes(void)
6df42ab9
PO
481{
482 static const char *system_wide;
483 if (!system_wide)
484 system_wide = system_path(ETC_GITATTRIBUTES);
485 return system_wide;
486}
487
c5147722 488static int git_attr_system(void)
6df42ab9
PO
489{
490 return !git_env_bool("GIT_ATTR_NOSYSTEM", 0);
491}
492
f932729c
JK
493static GIT_PATH_FUNC(git_path_info_attributes, INFOATTRIBUTES_FILE)
494
f48fd688
JH
495static void bootstrap_attr_stack(void)
496{
909ca7b9 497 struct attr_stack *elem;
f48fd688 498
909ca7b9
JH
499 if (attr_stack)
500 return;
f48fd688 501
909ca7b9
JH
502 elem = read_attr_from_array(builtin_attr);
503 elem->origin = NULL;
504 elem->prev = attr_stack;
505 attr_stack = elem;
6df42ab9 506
909ca7b9
JH
507 if (git_attr_system()) {
508 elem = read_attr_from_file(git_etc_gitattributes(), 1);
509 if (elem) {
510 elem->origin = NULL;
511 elem->prev = attr_stack;
512 attr_stack = elem;
6df42ab9 513 }
909ca7b9 514 }
6df42ab9 515
2527bbce
PT
516 if (!git_attributes_file)
517 git_attributes_file = xdg_config_home("attributes");
f0c1c15c
JK
518 if (git_attributes_file) {
519 elem = read_attr_from_file(git_attributes_file, 1);
520 if (elem) {
521 elem->origin = NULL;
522 elem->prev = attr_stack;
523 attr_stack = elem;
524 }
909ca7b9 525 }
f48fd688 526
909ca7b9
JH
527 if (!is_bare_repository() || direction == GIT_ATTR_INDEX) {
528 elem = read_attr(GITATTRIBUTES_FILE, 1);
6c65b5ea 529 elem->origin = xstrdup("");
cd6a0b26 530 elem->originlen = 0;
f48fd688
JH
531 elem->prev = attr_stack;
532 attr_stack = elem;
909ca7b9 533 debug_push(elem);
f48fd688 534 }
909ca7b9 535
f932729c 536 elem = read_attr_from_file(git_path_info_attributes(), 1);
909ca7b9
JH
537 if (!elem)
538 elem = xcalloc(1, sizeof(*elem));
539 elem->origin = NULL;
540 elem->prev = attr_stack;
541 attr_stack = elem;
f48fd688
JH
542}
543
9db9eecf 544static void prepare_attr_stack(const char *path, int dirlen)
d0bfd026
JH
545{
546 struct attr_stack *elem, *info;
9db9eecf 547 int len;
a8727017
MH
548 const char *cp;
549
d0bfd026
JH
550 /*
551 * At the bottom of the attribute stack is the built-in
6df42ab9
PO
552 * set of attribute definitions, followed by the contents
553 * of $(prefix)/etc/gitattributes and a file specified by
554 * core.attributesfile. Then, contents from
d0bfd026
JH
555 * .gitattribute files from directories closer to the
556 * root to the ones in deeper directories are pushed
557 * to the stack. Finally, at the very top of the stack
558 * we always keep the contents of $GIT_DIR/info/attributes.
559 *
560 * When checking, we use entries from near the top of the
561 * stack, preferring $GIT_DIR/info/attributes, then
562 * .gitattributes in deeper directories to shallower ones,
563 * and finally use the built-in set as the default.
564 */
7373eab4 565 bootstrap_attr_stack();
d0bfd026
JH
566
567 /*
568 * Pop the "info" one that is always at the top of the stack.
569 */
570 info = attr_stack;
571 attr_stack = info->prev;
572
573 /*
574 * Pop the ones from directories that are not the prefix of
c432ef99
JH
575 * the path we are checking. Break out of the loop when we see
576 * the root one (whose origin is an empty string "") or the builtin
577 * one (whose origin is NULL) without popping it.
d0bfd026 578 */
77f7f822 579 while (attr_stack->origin) {
d0bfd026
JH
580 int namelen = strlen(attr_stack->origin);
581
582 elem = attr_stack;
583 if (namelen <= dirlen &&
1afca444
JK
584 !strncmp(elem->origin, path, namelen) &&
585 (!namelen || path[namelen] == '/'))
d0bfd026
JH
586 break;
587
588 debug_pop(elem);
589 attr_stack = elem->prev;
590 free_attr_elem(elem);
591 }
592
593 /*
594 * Read from parent directories and push them down
595 */
4191e80a 596 if (!is_bare_repository() || direction == GIT_ATTR_INDEX) {
c432ef99
JH
597 /*
598 * bootstrap_attr_stack() should have added, and the
599 * above loop should have stopped before popping, the
600 * root element whose attr_stack->origin is set to an
601 * empty string.
602 */
97410b27 603 struct strbuf pathbuf = STRBUF_INIT;
2d35d556 604
c432ef99 605 assert(attr_stack->origin);
97410b27 606 while (1) {
2d35d556
RS
607 len = strlen(attr_stack->origin);
608 if (dirlen <= len)
609 break;
97410b27
BC
610 cp = memchr(path + len + 1, '/', dirlen - len - 1);
611 if (!cp)
612 cp = path + dirlen;
613 strbuf_add(&pathbuf, path, cp - path);
f66cf96d 614 strbuf_addch(&pathbuf, '/');
97410b27 615 strbuf_addstr(&pathbuf, GITATTRIBUTES_FILE);
f66cf96d 616 elem = read_attr(pathbuf.buf, 0);
97410b27 617 strbuf_setlen(&pathbuf, cp - path);
cd6a0b26 618 elem->origin = strbuf_detach(&pathbuf, &elem->originlen);
2d35d556
RS
619 elem->prev = attr_stack;
620 attr_stack = elem;
621 debug_push(elem);
622 }
d0bfd026 623
97410b27
BC
624 strbuf_release(&pathbuf);
625 }
d4c98565 626
d0bfd026
JH
627 /*
628 * Finally push the "info" one at the top of the stack.
629 */
630 info->prev = attr_stack;
631 attr_stack = info;
632}
633
634static int path_matches(const char *pathname, int pathlen,
bd2f371d 635 int basename_offset,
82dce998 636 const struct pattern *pat,
d0bfd026
JH
637 const char *base, int baselen)
638{
82dce998
NTND
639 const char *pattern = pat->pattern;
640 int prefix = pat->nowildcardlen;
dc09e9ec 641 int isdir = (pathlen && pathname[pathlen - 1] == '/');
82dce998 642
dc09e9ec 643 if ((pat->flags & EXC_FLAG_MUSTBEDIR) && !isdir)
94bc671a
JNA
644 return 0;
645
82dce998 646 if (pat->flags & EXC_FLAG_NODIR) {
bd2f371d 647 return match_basename(pathname + basename_offset,
dc09e9ec 648 pathlen - basename_offset - isdir,
82dce998
NTND
649 pattern, prefix,
650 pat->patternlen, pat->flags);
d0bfd026 651 }
dc09e9ec 652 return match_pathname(pathname, pathlen - isdir,
82dce998
NTND
653 base, baselen,
654 pattern, prefix, pat->patternlen, pat->flags);
d0bfd026
JH
655}
656
ec775c41
HG
657static int macroexpand_one(int attr_nr, int rem);
658
515106fa
JH
659static int fill_one(const char *what, struct match_attr *a, int rem)
660{
661 struct git_attr_check *check = check_all_attr;
662 int i;
663
969f9d73 664 for (i = a->num_attr - 1; 0 < rem && 0 <= i; i--) {
515106fa 665 struct git_attr *attr = a->state[i].attr;
a5e92abd
JH
666 const char **n = &(check[attr->attr_nr].value);
667 const char *v = a->state[i].setto;
515106fa
JH
668
669 if (*n == ATTR__UNKNOWN) {
426c27b7 670 debug_set(what,
712efb1a 671 a->is_macro ? a->u.attr->name : a->u.pat.pattern,
426c27b7 672 attr, v);
515106fa
JH
673 *n = v;
674 rem--;
ec775c41 675 rem = macroexpand_one(attr->attr_nr, rem);
515106fa
JH
676 }
677 }
678 return rem;
679}
680
bd2f371d 681static int fill(const char *path, int pathlen, int basename_offset,
4742d136 682 struct attr_stack *stk, int rem)
d0bfd026 683{
515106fa 684 int i;
d0bfd026
JH
685 const char *base = stk->origin ? stk->origin : "";
686
687 for (i = stk->num_matches - 1; 0 < rem && 0 <= i; i--) {
688 struct match_attr *a = stk->attrs[i];
f48fd688
JH
689 if (a->is_macro)
690 continue;
bd2f371d 691 if (path_matches(path, pathlen, basename_offset,
82dce998 692 &a->u.pat, base, stk->originlen))
515106fa 693 rem = fill_one("fill", a, rem);
d0bfd026
JH
694 }
695 return rem;
696}
697
aa7710e0 698static int macroexpand_one(int nr, int rem)
f48fd688 699{
ec775c41
HG
700 struct attr_stack *stk;
701 struct match_attr *a = NULL;
515106fa 702 int i;
f48fd688 703
fad32bcd
NTND
704 if (check_all_attr[nr].value != ATTR__TRUE ||
705 !check_all_attr[nr].attr->maybe_macro)
ec775c41
HG
706 return rem;
707
708 for (stk = attr_stack; !a && stk; stk = stk->prev)
709 for (i = stk->num_matches - 1; !a && 0 <= i; i--) {
710 struct match_attr *ma = stk->attrs[i];
711 if (!ma->is_macro)
712 continue;
aa7710e0 713 if (ma->u.attr->attr_nr == nr)
ec775c41
HG
714 a = ma;
715 }
716
717 if (a)
515106fa 718 rem = fill_one("expand", a, rem);
ec775c41 719
f48fd688
JH
720 return rem;
721}
722
2d721744 723/*
06a604e6
NTND
724 * Collect attributes for path into the array pointed to by
725 * check_all_attr. If num is non-zero, only attributes in check[] are
726 * collected. Otherwise all attributes are collected.
2d721744 727 */
06a604e6
NTND
728static void collect_some_attrs(const char *path, int num,
729 struct git_attr_check *check)
730
d0bfd026
JH
731{
732 struct attr_stack *stk;
9db9eecf 733 int i, pathlen, rem, dirlen;
bd2f371d
JH
734 const char *cp, *last_slash = NULL;
735 int basename_offset;
9db9eecf
NTND
736
737 for (cp = path; *cp; cp++) {
738 if (*cp == '/' && cp[1])
739 last_slash = cp;
740 }
741 pathlen = cp - path;
742 if (last_slash) {
bd2f371d 743 basename_offset = last_slash + 1 - path;
9db9eecf
NTND
744 dirlen = last_slash - path;
745 } else {
bd2f371d 746 basename_offset = 0;
9db9eecf
NTND
747 dirlen = 0;
748 }
d0bfd026 749
9db9eecf 750 prepare_attr_stack(path, dirlen);
f48fd688 751 for (i = 0; i < attr_nr; i++)
515106fa 752 check_all_attr[i].value = ATTR__UNKNOWN;
06a604e6
NTND
753 if (num && !cannot_trust_maybe_real) {
754 rem = 0;
755 for (i = 0; i < num; i++) {
756 if (!check[i].attr->maybe_real) {
757 struct git_attr_check *c;
758 c = check_all_attr + check[i].attr->attr_nr;
759 c->value = ATTR__UNSET;
760 rem++;
761 }
762 }
763 if (rem == num)
764 return;
765 }
d0bfd026 766
f48fd688
JH
767 rem = attr_nr;
768 for (stk = attr_stack; 0 < rem && stk; stk = stk->prev)
bd2f371d 769 rem = fill(path, pathlen, basename_offset, stk, rem);
2d721744
MH
770}
771
d932f4eb 772int git_check_attr(const char *path, int num, struct git_attr_check *check)
2d721744
MH
773{
774 int i;
775
06a604e6 776 collect_some_attrs(path, num, check);
f48fd688 777
515106fa 778 for (i = 0; i < num; i++) {
a5e92abd 779 const char *value = check_all_attr[check[i].attr->attr_nr].value;
515106fa
JH
780 if (value == ATTR__UNKNOWN)
781 value = ATTR__UNSET;
782 check[i].value = value;
783 }
f48fd688 784
d0bfd026
JH
785 return 0;
786}
06f33c17 787
ee548df3
MH
788int git_all_attrs(const char *path, int *num, struct git_attr_check **check)
789{
790 int i, count, j;
791
06a604e6 792 collect_some_attrs(path, 0, NULL);
ee548df3
MH
793
794 /* Count the number of attributes that are set. */
795 count = 0;
796 for (i = 0; i < attr_nr; i++) {
797 const char *value = check_all_attr[i].value;
798 if (value != ATTR__UNSET && value != ATTR__UNKNOWN)
799 ++count;
800 }
801 *num = count;
b32fa95f 802 ALLOC_ARRAY(*check, count);
ee548df3
MH
803 j = 0;
804 for (i = 0; i < attr_nr; i++) {
805 const char *value = check_all_attr[i].value;
806 if (value != ATTR__UNSET && value != ATTR__UNKNOWN) {
807 (*check)[j].attr = check_all_attr[i].attr;
808 (*check)[j].value = value;
809 ++j;
810 }
811 }
812
813 return 0;
814}
815
06f33c17
JH
816void git_attr_set_direction(enum git_attr_direction new, struct index_state *istate)
817{
818 enum git_attr_direction old = direction;
4191e80a
NTND
819
820 if (is_bare_repository() && new != GIT_ATTR_INDEX)
821 die("BUG: non-INDEX attr direction in a bare repo");
822
06f33c17
JH
823 direction = new;
824 if (new != old)
825 drop_attr_stack();
826 use_index = istate;
827}