convert.c

   1 #include "cache.h"
   2 #include "attr.h"
   3 #include "run-command.h"
   4
   5 /*
   6  * convert.c - convert a file when checking it out and checking it in.
   7  *
   8  * This should use the pathname to decide on whether it wants to do some
   9  * more interesting conversions (automatic gzip/unzip, general format
  10  * conversions etc etc), but by default it just does automatic CRLF<->LF
  11  * translation when the "text" attribute or "auto_crlf" option is set.
  12  */
  13
  14 enum action {
  15         CRLF_GUESS = -1,
  16         CRLF_BINARY = 0,
  17         CRLF_TEXT,
  18         CRLF_INPUT,
  19         CRLF_CRLF,
  20         CRLF_AUTO,
  21 };
  22
  23 struct text_stat {
  24         /* NUL, CR, LF and CRLF counts */
  25         unsigned nul, cr, lf, crlf;
  26
  27         /* These are just approximations! */
  28         unsigned printable, nonprintable;
  29 };
  30
  31 static void gather_stats(const char *buf, unsigned long size, struct text_stat *stats)
  32 {
  33         unsigned long i;
  34
  35         memset(stats, 0, sizeof(*stats));
  36
  37         for (i = 0; i < size; i++) {
  38                 unsigned char c = buf[i];
  39                 if (c == '\r') {
  40                         stats->cr++;
  41                         if (i+1 < size && buf[i+1] == '\n')
  42                                 stats->crlf++;
  43                         continue;
  44                 }
  45                 if (c == '\n') {
  46                         stats->lf++;
  47                         continue;
  48                 }
  49                 if (c == 127)
  50                         /* DEL */
  51                         stats->nonprintable++;
  52                 else if (c < 32) {
  53                         switch (c) {
  54                                 /* BS, HT, ESC and FF */
  55                         case '\b': case '\t': case '\033': case '\014':
  56                                 stats->printable++;
  57                                 break;
  58                         case 0:
  59                                 stats->nul++;
  60                                 /* fall through */
  61                         default:
  62                                 stats->nonprintable++;
  63                         }
  64                 }
  65                 else
  66                         stats->printable++;
  67         }
  68
  69         /* If file ends with EOF then don't count this EOF as non-printable. */
  70         if (size >= 1 && buf[size-1] == '\032')
  71                 stats->nonprintable--;
  72 }
  73
  74 /*
  75  * The same heuristics as diff.c::mmfile_is_binary()
  76  */
  77 static int is_binary(unsigned long size, struct text_stat *stats)
  78 {
  79
  80         if (stats->nul)
  81                 return 1;
  82         if ((stats->printable >> 7) < stats->nonprintable)
  83                 return 1;
  84         /*
  85          * Other heuristics? Average line length might be relevant,
  86          * as might LF vs CR vs CRLF counts..
  87          *
  88          * NOTE! It might be normal to have a low ratio of CRLF to LF
  89          * (somebody starts with a LF-only file and edits it with an editor
  90          * that adds CRLF only to lines that are added..). But do  we
  91          * want to support CR-only? Probably not.
  92          */
  93         return 0;
  94 }
  95
  96 static enum eol determine_output_conversion(enum action action)
  97 {
  98         switch (action) {
  99         case CRLF_BINARY:
 100                 return EOL_UNSET;
 101         case CRLF_CRLF:
 102                 return EOL_CRLF;
 103         case CRLF_INPUT:
 104                 return EOL_LF;
 105         case CRLF_GUESS:
 106                 if (!auto_crlf)
 107                         return EOL_UNSET;
 108                 /* fall through */
 109         case CRLF_TEXT:
 110         case CRLF_AUTO:
 111                 if (auto_crlf == AUTO_CRLF_TRUE)
 112                         return EOL_CRLF;
 113                 else if (auto_crlf == AUTO_CRLF_INPUT)
 114                         return EOL_LF;
 115                 else if (eol == EOL_UNSET)
 116                         return EOL_NATIVE;
 117         }
 118         return eol;
 119 }
 120
 121 static void check_safe_crlf(const char *path, enum action action,
 122                             struct text_stat *stats, enum safe_crlf checksafe)
 123 {
 124         if (!checksafe)
 125                 return;
 126
 127         if (determine_output_conversion(action) == EOL_LF) {
 128                 /*
 129                  * CRLFs would not be restored by checkout:
 130                  * check if we'd remove CRLFs
 131                  */
 132                 if (stats->crlf) {
 133                         if (checksafe == SAFE_CRLF_WARN)
 134                                 warning("CRLF will be replaced by LF in %s.\nThe file will have its original line endings in your working directory.", path);
 135                         else /* i.e. SAFE_CRLF_FAIL */
 136                                 die("CRLF would be replaced by LF in %s.", path);
 137                 }
 138         } else if (determine_output_conversion(action) == EOL_CRLF) {
 139                 /*
 140                  * CRLFs would be added by checkout:
 141                  * check if we have "naked" LFs
 142                  */
 143                 if (stats->lf != stats->crlf) {
 144                         if (checksafe == SAFE_CRLF_WARN)
 145                                 warning("LF will be replaced by CRLF in %s.\nThe file will have its original line endings in your working directory.", path);
 146                         else /* i.e. SAFE_CRLF_FAIL */
 147                                 die("LF would be replaced by CRLF in %s", path);
 148                 }
 149         }
 150 }
 151
 152 static int has_cr_in_index(const char *path)
 153 {
 154         int pos, len;
 155         unsigned long sz;
 156         enum object_type type;
 157         void *data;
 158         int has_cr;
 159         struct index_state *istate = &the_index;
 160
 161         len = strlen(path);
 162         pos = index_name_pos(istate, path, len);
 163         if (pos < 0) {
 164                 /*
 165                  * We might be in the middle of a merge, in which
 166                  * case we would read stage #2 (ours).
 167                  */
 168                 int i;
 169                 for (i = -pos - 1;
 170                      (pos < 0 && i < istate->cache_nr &&
 171                       !strcmp(istate->cache[i]->name, path));
 172                      i++)
 173                         if (ce_stage(istate->cache[i]) == 2)
 174                                 pos = i;
 175         }
 176         if (pos < 0)
 177                 return 0;
 178         data = read_sha1_file(istate->cache[pos]->sha1, &type, &sz);
 179         if (!data || type != OBJ_BLOB) {
 180                 free(data);
 181                 return 0;
 182         }
 183
 184         has_cr = memchr(data, '\r', sz) != NULL;
 185         free(data);
 186         return has_cr;
 187 }
 188
 189 static int crlf_to_git(const char *path, const char *src, size_t len,
 190                        struct strbuf *buf, enum action action, enum safe_crlf checksafe)
 191 {
 192         struct text_stat stats;
 193         char *dst;
 194
 195         if (action == CRLF_BINARY ||
 196             (action == CRLF_GUESS && auto_crlf == AUTO_CRLF_FALSE) || !len)
 197                 return 0;
 198
 199         gather_stats(src, len, &stats);
 200
 201         if (action == CRLF_AUTO || action == CRLF_GUESS) {
 202                 /*
 203                  * We're currently not going to even try to convert stuff
 204                  * that has bare CR characters. Does anybody do that crazy
 205                  * stuff?
 206                  */
 207                 if (stats.cr != stats.crlf)
 208                         return 0;
 209
 210                 /*
 211                  * And add some heuristics for binary vs text, of course...
 212                  */
 213                 if (is_binary(len, &stats))
 214                         return 0;
 215
 216                 if (action == CRLF_GUESS) {
 217                         /*
 218                          * If the file in the index has any CR in it, do not convert.
 219                          * This is the new safer autocrlf handling.
 220                          */
 221                         if (has_cr_in_index(path))
 222                                 return 0;
 223                 }
 224         }
 225
 226         check_safe_crlf(path, action, &stats, checksafe);
 227
 228         /* Optimization: No CR? Nothing to convert, regardless. */
 229         if (!stats.cr)
 230                 return 0;
 231
 232         /* only grow if not in place */
 233         if (strbuf_avail(buf) + buf->len < len)
 234                 strbuf_grow(buf, len - buf->len);
 235         dst = buf->buf;
 236         if (action == CRLF_AUTO || action == CRLF_GUESS) {
 237                 /*
 238                  * If we guessed, we already know we rejected a file with
 239                  * lone CR, and we can strip a CR without looking at what
 240                  * follow it.
 241                  */
 242                 do {
 243                         unsigned char c = *src++;
 244                         if (c != '\r')
 245                                 *dst++ = c;
 246                 } while (--len);
 247         } else {
 248                 do {
 249                         unsigned char c = *src++;
 250                         if (! (c == '\r' && (1 < len && *src == '\n')))
 251                                 *dst++ = c;
 252                 } while (--len);
 253         }
 254         strbuf_setlen(buf, dst - buf->buf);
 255         return 1;
 256 }
 257
 258 static int crlf_to_worktree(const char *path, const char *src, size_t len,
 259                             struct strbuf *buf, enum action action)
 260 {
 261         char *to_free = NULL;
 262         struct text_stat stats;
 263
 264         if (!len || determine_output_conversion(action) != EOL_CRLF)
 265                 return 0;
 266
 267         gather_stats(src, len, &stats);
 268
 269         /* No LF? Nothing to convert, regardless. */
 270         if (!stats.lf)
 271                 return 0;
 272
 273         /* Was it already in CRLF format? */
 274         if (stats.lf == stats.crlf)
 275                 return 0;
 276
 277         if (action == CRLF_AUTO || action == CRLF_GUESS) {
 278                 if (action == CRLF_GUESS) {
 279                         /* If we have any CR or CRLF line endings, we do not touch it */
 280                         /* This is the new safer autocrlf-handling */
 281                         if (stats.cr > 0 || stats.crlf > 0)
 282                                 return 0;
 283                 }
 284
 285                 /* If we have any bare CR characters, we're not going to touch it */
 286                 if (stats.cr != stats.crlf)
 287                         return 0;
 288
 289                 if (is_binary(len, &stats))
 290                         return 0;
 291         }
 292
 293         /* are we "faking" in place editing ? */
 294         if (src == buf->buf)
 295                 to_free = strbuf_detach(buf, NULL);
 296
 297         strbuf_grow(buf, len + stats.lf - stats.crlf);
 298         for (;;) {
 299                 const char *nl = memchr(src, '\n', len);
 300                 if (!nl)
 301                         break;
 302                 if (nl > src && nl[-1] == '\r') {
 303                         strbuf_add(buf, src, nl + 1 - src);
 304                 } else {
 305                         strbuf_add(buf, src, nl - src);
 306                         strbuf_addstr(buf, "\r\n");
 307                 }
 308                 len -= nl + 1 - src;
 309                 src  = nl + 1;
 310         }
 311         strbuf_add(buf, src, len);
 312
 313         free(to_free);
 314         return 1;
 315 }
 316
 317 struct filter_params {
 318         const char *src;
 319         unsigned long size;
 320         const char *cmd;
 321 };
 322
 323 static int filter_buffer(int in, int out, void *data)
 324 {
 325         /*
 326          * Spawn cmd and feed the buffer contents through its stdin.
 327          */
 328         struct child_process child_process;
 329         struct filter_params *params = (struct filter_params *)data;
 330         int write_err, status;
 331         const char *argv[] = { NULL, NULL };
 332
 333         argv[0] = params->cmd;
 334
 335         memset(&child_process, 0, sizeof(child_process));
 336         child_process.argv = argv;
 337         child_process.use_shell = 1;
 338         child_process.in = -1;
 339         child_process.out = out;
 340
 341         if (start_command(&child_process))
 342                 return error("cannot fork to run external filter %s", params->cmd);
 343
 344         write_err = (write_in_full(child_process.in, params->src, params->size) < 0);
 345         if (close(child_process.in))
 346                 write_err = 1;
 347         if (write_err)
 348                 error("cannot feed the input to external filter %s", params->cmd);
 349
 350         status = finish_command(&child_process);
 351         if (status)
 352                 error("external filter %s failed %d", params->cmd, status);
 353         return (write_err || status);
 354 }
 355
 356 static int apply_filter(const char *path, const char *src, size_t len,
 357                         struct strbuf *dst, const char *cmd)
 358 {
 359         /*
 360          * Create a pipeline to have the command filter the buffer's
 361          * contents.
 362          *
 363          * (child --> cmd) --> us
 364          */
 365         int ret = 1;
 366         struct strbuf nbuf = STRBUF_INIT;
 367         struct async async;
 368         struct filter_params params;
 369
 370         if (!cmd)
 371                 return 0;
 372
 373         memset(&async, 0, sizeof(async));
 374         async.proc = filter_buffer;
 375         async.data = &params;
 376         async.out = -1;
 377         params.src = src;
 378         params.size = len;
 379         params.cmd = cmd;
 380
 381         fflush(NULL);
 382         if (start_async(&async))
 383                 return 0;       /* error was already reported */
 384
 385         if (strbuf_read(&nbuf, async.out, len) < 0) {
 386                 error("read from external filter %s failed", cmd);
 387                 ret = 0;
 388         }
 389         if (close(async.out)) {
 390                 error("read from external filter %s failed", cmd);
 391                 ret = 0;
 392         }
 393         if (finish_async(&async)) {
 394                 error("external filter %s failed", cmd);
 395                 ret = 0;
 396         }
 397
 398         if (ret) {
 399                 strbuf_swap(dst, &nbuf);
 400         }
 401         strbuf_release(&nbuf);
 402         return ret;
 403 }
 404
 405 static struct convert_driver {
 406         const char *name;
 407         struct convert_driver *next;
 408         const char *smudge;
 409         const char *clean;
 410 } *user_convert, **user_convert_tail;
 411
 412 static int read_convert_config(const char *var, const char *value, void *cb)
 413 {
 414         const char *ep, *name;
 415         int namelen;
 416         struct convert_driver *drv;
 417
 418         /*
 419          * External conversion drivers are configured using
 420          * "filter.<name>.variable".
 421          */
 422         if (prefixcmp(var, "filter.") || (ep = strrchr(var, '.')) == var + 6)
 423                 return 0;
 424         name = var + 7;
 425         namelen = ep - name;
 426         for (drv = user_convert; drv; drv = drv->next)
 427                 if (!strncmp(drv->name, name, namelen) && !drv->name[namelen])
 428                         break;
 429         if (!drv) {
 430                 drv = xcalloc(1, sizeof(struct convert_driver));
 431                 drv->name = xmemdupz(name, namelen);
 432                 *user_convert_tail = drv;
 433                 user_convert_tail = &(drv->next);
 434         }
 435
 436         ep++;
 437
 438         /*
 439          * filter.<name>.smudge and filter.<name>.clean specifies
 440          * the command line:
 441          *
 442          *      command-line
 443          *
 444          * The command-line will not be interpolated in any way.
 445          */
 446
 447         if (!strcmp("smudge", ep))
 448                 return git_config_string(&drv->smudge, var, value);
 449
 450         if (!strcmp("clean", ep))
 451                 return git_config_string(&drv->clean, var, value);
 452
 453         return 0;
 454 }
 455
 456 static void setup_convert_check(struct git_attr_check *check)
 457 {
 458         static struct git_attr *attr_text;
 459         static struct git_attr *attr_crlf;
 460         static struct git_attr *attr_eol;
 461         static struct git_attr *attr_ident;
 462         static struct git_attr *attr_filter;
 463
 464         if (!attr_text) {
 465                 attr_text = git_attr("text");
 466                 attr_crlf = git_attr("crlf");
 467                 attr_eol = git_attr("eol");
 468                 attr_ident = git_attr("ident");
 469                 attr_filter = git_attr("filter");
 470                 user_convert_tail = &user_convert;
 471                 git_config(read_convert_config, NULL);
 472         }
 473         check[0].attr = attr_crlf;
 474         check[1].attr = attr_ident;
 475         check[2].attr = attr_filter;
 476         check[3].attr = attr_eol;
 477         check[4].attr = attr_text;
 478 }
 479
 480 static int count_ident(const char *cp, unsigned long size)
 481 {
 482         /*
 483          * "$Id: 0000000000000000000000000000000000000000 $" <=> "$Id$"
 484          */
 485         int cnt = 0;
 486         char ch;
 487
 488         while (size) {
 489                 ch = *cp++;
 490                 size--;
 491                 if (ch != '$')
 492                         continue;
 493                 if (size < 3)
 494                         break;
 495                 if (memcmp("Id", cp, 2))
 496                         continue;
 497                 ch = cp[2];
 498                 cp += 3;
 499                 size -= 3;
 500                 if (ch == '$')
 501                         cnt++; /* $Id$ */
 502                 if (ch != ':')
 503                         continue;
 504
 505                 /*
 506                  * "$Id: ... "; scan up to the closing dollar sign and discard.
 507                  */
 508                 while (size) {
 509                         ch = *cp++;
 510                         size--;
 511                         if (ch == '$') {
 512                                 cnt++;
 513                                 break;
 514                         }
 515                         if (ch == '\n')
 516                                 break;
 517                 }
 518         }
 519         return cnt;
 520 }
 521
 522 static int ident_to_git(const char *path, const char *src, size_t len,
 523                         struct strbuf *buf, int ident)
 524 {
 525         char *dst, *dollar;
 526
 527         if (!ident || !count_ident(src, len))
 528                 return 0;
 529
 530         /* only grow if not in place */
 531         if (strbuf_avail(buf) + buf->len < len)
 532                 strbuf_grow(buf, len - buf->len);
 533         dst = buf->buf;
 534         for (;;) {
 535                 dollar = memchr(src, '$', len);
 536                 if (!dollar)
 537                         break;
 538                 memcpy(dst, src, dollar + 1 - src);
 539                 dst += dollar + 1 - src;
 540                 len -= dollar + 1 - src;
 541                 src  = dollar + 1;
 542
 543                 if (len > 3 && !memcmp(src, "Id:", 3)) {
 544                         dollar = memchr(src + 3, '$', len - 3);
 545                         if (!dollar)
 546                                 break;
 547                         if (memchr(src + 3, '\n', dollar - src - 3)) {
 548                                 /* Line break before the next dollar. */
 549                                 continue;
 550                         }
 551
 552                         memcpy(dst, "Id$", 3);
 553                         dst += 3;
 554                         len -= dollar + 1 - src;
 555                         src  = dollar + 1;
 556                 }
 557         }
 558         memcpy(dst, src, len);
 559         strbuf_setlen(buf, dst + len - buf->buf);
 560         return 1;
 561 }
 562
 563 static int ident_to_worktree(const char *path, const char *src, size_t len,
 564                              struct strbuf *buf, int ident)
 565 {
 566         unsigned char sha1[20];
 567         char *to_free = NULL, *dollar, *spc;
 568         int cnt;
 569
 570         if (!ident)
 571                 return 0;
 572
 573         cnt = count_ident(src, len);
 574         if (!cnt)
 575                 return 0;
 576
 577         /* are we "faking" in place editing ? */
 578         if (src == buf->buf)
 579                 to_free = strbuf_detach(buf, NULL);
 580         hash_sha1_file(src, len, "blob", sha1);
 581
 582         strbuf_grow(buf, len + cnt * 43);
 583         for (;;) {
 584                 /* step 1: run to the next '$' */
 585                 dollar = memchr(src, '$', len);
 586                 if (!dollar)
 587                         break;
 588                 strbuf_add(buf, src, dollar + 1 - src);
 589                 len -= dollar + 1 - src;
 590                 src  = dollar + 1;
 591
 592                 /* step 2: does it looks like a bit like Id:xxx$ or Id$ ? */
 593                 if (len < 3 || memcmp("Id", src, 2))
 594                         continue;
 595
 596                 /* step 3: skip over Id$ or Id:xxxxx$ */
 597                 if (src[2] == '$') {
 598                         src += 3;
 599                         len -= 3;
 600                 } else if (src[2] == ':') {
 601                         /*
 602                          * It's possible that an expanded Id has crept its way into the
 603                          * repository, we cope with that by stripping the expansion out.
 604                          * This is probably not a good idea, since it will cause changes
 605                          * on checkout, which won't go away by stash, but let's keep it
 606                          * for git-style ids.
 607                          */
 608                         dollar = memchr(src + 3, '$', len - 3);
 609                         if (!dollar) {
 610                                 /* incomplete keyword, no more '$', so just quit the loop */
 611                                 break;
 612                         }
 613
 614                         if (memchr(src + 3, '\n', dollar - src - 3)) {
 615                                 /* Line break before the next dollar. */
 616                                 continue;
 617                         }
 618
 619                         spc = memchr(src + 4, ' ', dollar - src - 4);
 620                         if (spc && spc < dollar-1) {
 621                                 /* There are spaces in unexpected places.
 622                                  * This is probably an id from some other
 623                                  * versioning system. Keep it for now.
 624                                  */
 625                                 continue;
 626                         }
 627
 628                         len -= dollar + 1 - src;
 629                         src  = dollar + 1;
 630                 } else {
 631                         /* it wasn't a "Id$" or "Id:xxxx$" */
 632                         continue;
 633                 }
 634
 635                 /* step 4: substitute */
 636                 strbuf_addstr(buf, "Id: ");
 637                 strbuf_add(buf, sha1_to_hex(sha1), 40);
 638                 strbuf_addstr(buf, " $");
 639         }
 640         strbuf_add(buf, src, len);
 641
 642         free(to_free);
 643         return 1;
 644 }
 645
 646 static int git_path_check_crlf(const char *path, struct git_attr_check *check)
 647 {
 648         const char *value = check->value;
 649
 650         if (ATTR_TRUE(value))
 651                 return CRLF_TEXT;
 652         else if (ATTR_FALSE(value))
 653                 return CRLF_BINARY;
 654         else if (ATTR_UNSET(value))
 655                 ;
 656         else if (!strcmp(value, "input"))
 657                 return CRLF_INPUT;
 658         else if (!strcmp(value, "auto"))
 659                 return CRLF_AUTO;
 660         return CRLF_GUESS;
 661 }
 662
 663 static int git_path_check_eol(const char *path, struct git_attr_check *check)
 664 {
 665         const char *value = check->value;
 666
 667         if (ATTR_UNSET(value))
 668                 ;
 669         else if (!strcmp(value, "lf"))
 670                 return EOL_LF;
 671         else if (!strcmp(value, "crlf"))
 672                 return EOL_CRLF;
 673         return EOL_UNSET;
 674 }
 675
 676 static struct convert_driver *git_path_check_convert(const char *path,
 677                                              struct git_attr_check *check)
 678 {
 679         const char *value = check->value;
 680         struct convert_driver *drv;
 681
 682         if (ATTR_TRUE(value) || ATTR_FALSE(value) || ATTR_UNSET(value))
 683                 return NULL;
 684         for (drv = user_convert; drv; drv = drv->next)
 685                 if (!strcmp(value, drv->name))
 686                         return drv;
 687         return NULL;
 688 }
 689
 690 static int git_path_check_ident(const char *path, struct git_attr_check *check)
 691 {
 692         const char *value = check->value;
 693
 694         return !!ATTR_TRUE(value);
 695 }
 696
 697 static enum action determine_action(enum action text_attr, enum eol eol_attr)
 698 {
 699         if (text_attr == CRLF_BINARY)
 700                 return CRLF_BINARY;
 701         if (eol_attr == EOL_LF)
 702                 return CRLF_INPUT;
 703         if (eol_attr == EOL_CRLF)
 704                 return CRLF_CRLF;
 705         return text_attr;
 706 }
 707
 708 int convert_to_git(const char *path, const char *src, size_t len,
 709                    struct strbuf *dst, enum safe_crlf checksafe)
 710 {
 711         struct git_attr_check check[5];
 712         enum action action = CRLF_GUESS;
 713         enum eol eol_attr = EOL_UNSET;
 714         int ident = 0, ret = 0;
 715         const char *filter = NULL;
 716
 717         setup_convert_check(check);
 718         if (!git_checkattr(path, ARRAY_SIZE(check), check)) {
 719                 struct convert_driver *drv;
 720                 action = git_path_check_crlf(path, check + 4);
 721                 if (action == CRLF_GUESS)
 722                         action = git_path_check_crlf(path, check + 0);
 723                 ident = git_path_check_ident(path, check + 1);
 724                 drv = git_path_check_convert(path, check + 2);
 725                 eol_attr = git_path_check_eol(path, check + 3);
 726                 if (drv && drv->clean)
 727                         filter = drv->clean;
 728         }
 729
 730         ret |= apply_filter(path, src, len, dst, filter);
 731         if (ret) {
 732                 src = dst->buf;
 733                 len = dst->len;
 734         }
 735         action = determine_action(action, eol_attr);
 736         ret |= crlf_to_git(path, src, len, dst, action, checksafe);
 737         if (ret) {
 738                 src = dst->buf;
 739                 len = dst->len;
 740         }
 741         return ret | ident_to_git(path, src, len, dst, ident);
 742 }
 743
 744 int convert_to_working_tree(const char *path, const char *src, size_t len, struct strbuf *dst)
 745 {
 746         struct git_attr_check check[5];
 747         enum action action = CRLF_GUESS;
 748         enum eol eol_attr = EOL_UNSET;
 749         int ident = 0, ret = 0;
 750         const char *filter = NULL;
 751
 752         setup_convert_check(check);
 753         if (!git_checkattr(path, ARRAY_SIZE(check), check)) {
 754                 struct convert_driver *drv;
 755                 action = git_path_check_crlf(path, check + 4);
 756                 if (action == CRLF_GUESS)
 757                         action = git_path_check_crlf(path, check + 0);
 758                 ident = git_path_check_ident(path, check + 1);
 759                 drv = git_path_check_convert(path, check + 2);
 760                 eol_attr = git_path_check_eol(path, check + 3);
 761                 if (drv && drv->smudge)
 762                         filter = drv->smudge;
 763         }
 764
 765         ret |= ident_to_worktree(path, src, len, dst, ident);
 766         if (ret) {
 767                 src = dst->buf;
 768                 len = dst->len;
 769         }
 770         action = determine_action(action, eol_attr);
 771         ret |= crlf_to_worktree(path, src, len, dst, action);
 772         if (ret) {
 773                 src = dst->buf;
 774                 len = dst->len;
 775         }
 776         return ret | apply_filter(path, src, len, dst, filter);
 777 }
 778
 779 int renormalize_buffer(const char *path, const char *src, size_t len, struct strbuf *dst)
 780 {
 781         int ret = convert_to_working_tree(path, src, len, dst);
 782         if (ret) {
 783                 src = dst->buf;
 784                 len = dst->len;
 785         }
 786         return ret | convert_to_git(path, src, len, dst, 0);
 787 }