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