attr.c

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