convert.c

   1 #include "cache.h"
   2 #include "attr.h"
   3 #include "run-command.h"
   4 #include "quote.h"
   5
   6 /*
   7  * convert.c - convert a file when checking it out and checking it in.
   8  *
   9  * This should use the pathname to decide on whether it wants to do some
  10  * more interesting conversions (automatic gzip/unzip, general format
  11  * conversions etc etc), but by default it just does automatic CRLF<->LF
  12  * translation when the "text" attribute or "auto_crlf" option is set.
  13  */
  14
  15 enum action {
  16         CRLF_GUESS = -1,
  17         CRLF_BINARY = 0,
  18         CRLF_TEXT,
  19         CRLF_INPUT,
  20         CRLF_CRLF,
  21         CRLF_AUTO,
  22 };
  23
  24 struct text_stat {
  25         /* NUL, CR, LF and CRLF counts */
  26         unsigned nul, cr, lf, crlf;
  27
  28         /* These are just approximations! */
  29         unsigned printable, nonprintable;
  30 };
  31
  32 static void gather_stats(const char *buf, unsigned long size, struct text_stat *stats)
  33 {
  34         unsigned long i;
  35
  36         memset(stats, 0, sizeof(*stats));
  37
  38         for (i = 0; i < size; i++) {
  39                 unsigned char c = buf[i];
  40                 if (c == '\r') {
  41                         stats->cr++;
  42                         if (i+1 < size && buf[i+1] == '\n')
  43                                 stats->crlf++;
  44                         continue;
  45                 }
  46                 if (c == '\n') {
  47                         stats->lf++;
  48                         continue;
  49                 }
  50                 if (c == 127)
  51                         /* DEL */
  52                         stats->nonprintable++;
  53                 else if (c < 32) {
  54                         switch (c) {
  55                                 /* BS, HT, ESC and FF */
  56                         case '\b': case '\t': case '\033': case '\014':
  57                                 stats->printable++;
  58                                 break;
  59                         case 0:
  60                                 stats->nul++;
  61                                 /* fall through */
  62                         default:
  63                                 stats->nonprintable++;
  64                         }
  65                 }
  66                 else
  67                         stats->printable++;
  68         }
  69
  70         /* If file ends with EOF then don't count this EOF as non-printable. */
  71         if (size >= 1 && buf[size-1] == '\032')
  72                 stats->nonprintable--;
  73 }
  74
  75 /*
  76  * The same heuristics as diff.c::mmfile_is_binary()
  77  */
  78 static int is_binary(unsigned long size, struct text_stat *stats)
  79 {
  80
  81         if (stats->nul)
  82                 return 1;
  83         if ((stats->printable >> 7) < stats->nonprintable)
  84                 return 1;
  85         /*
  86          * Other heuristics? Average line length might be relevant,
  87          * as might LF vs CR vs CRLF counts..
  88          *
  89          * NOTE! It might be normal to have a low ratio of CRLF to LF
  90          * (somebody starts with a LF-only file and edits it with an editor
  91          * that adds CRLF only to lines that are added..). But do  we
  92          * want to support CR-only? Probably not.
  93          */
  94         return 0;
  95 }
  96
  97 static enum eol determine_output_conversion(enum action action)
  98 {
  99         switch (action) {
 100         case CRLF_BINARY:
 101                 return EOL_UNSET;
 102         case CRLF_CRLF:
 103                 return EOL_CRLF;
 104         case CRLF_INPUT:
 105                 return EOL_LF;
 106         case CRLF_GUESS:
 107                 if (!auto_crlf)
 108                         return EOL_UNSET;
 109                 /* fall through */
 110         case CRLF_TEXT:
 111         case CRLF_AUTO:
 112                 if (auto_crlf == AUTO_CRLF_TRUE)
 113                         return EOL_CRLF;
 114                 else if (auto_crlf == AUTO_CRLF_INPUT)
 115                         return EOL_LF;
 116                 else if (eol == EOL_UNSET)
 117                         return EOL_NATIVE;
 118         }
 119         return eol;
 120 }
 121
 122 static void check_safe_crlf(const char *path, enum action action,
 123                             struct text_stat *stats, enum safe_crlf checksafe)
 124 {
 125         if (!checksafe)
 126                 return;
 127
 128         if (determine_output_conversion(action) == EOL_LF) {
 129                 /*
 130                  * CRLFs would not be restored by checkout:
 131                  * check if we'd remove CRLFs
 132                  */
 133                 if (stats->crlf) {
 134                         if (checksafe == SAFE_CRLF_WARN)
 135                                 warning("CRLF will be replaced by LF in %s.\nThe file will have its original line endings in your working directory.", path);
 136                         else /* i.e. SAFE_CRLF_FAIL */
 137                                 die("CRLF would be replaced by LF in %s.", path);
 138                 }
 139         } else if (determine_output_conversion(action) == EOL_CRLF) {
 140                 /*
 141                  * CRLFs would be added by checkout:
 142                  * check if we have "naked" LFs
 143                  */
 144                 if (stats->lf != stats->crlf) {
 145                         if (checksafe == SAFE_CRLF_WARN)
 146                                 warning("LF will be replaced by CRLF in %s.\nThe file will have its original line endings in your working directory.", path);
 147                         else /* i.e. SAFE_CRLF_FAIL */
 148                                 die("LF would be replaced by CRLF in %s", path);
 149                 }
 150         }
 151 }
 152
 153 static int has_cr_in_index(const char *path)
 154 {
 155         int pos, len;
 156         unsigned long sz;
 157         enum object_type type;
 158         void *data;
 159         int has_cr;
 160         struct index_state *istate = &the_index;
 161
 162         len = strlen(path);
 163         pos = index_name_pos(istate, path, len);
 164         if (pos < 0) {
 165                 /*
 166                  * We might be in the middle of a merge, in which
 167                  * case we would read stage #2 (ours).
 168                  */
 169                 int i;
 170                 for (i = -pos - 1;
 171                      (pos < 0 && i < istate->cache_nr &&
 172                       !strcmp(istate->cache[i]->name, path));
 173                      i++)
 174                         if (ce_stage(istate->cache[i]) == 2)
 175                                 pos = i;
 176         }
 177         if (pos < 0)
 178                 return 0;
 179         data = read_sha1_file(istate->cache[pos]->sha1, &type, &sz);
 180         if (!data || type != OBJ_BLOB) {
 181                 free(data);
 182                 return 0;
 183         }
 184
 185         has_cr = memchr(data, '\r', sz) != NULL;
 186         free(data);
 187         return has_cr;
 188 }
 189
 190 static int crlf_to_git(const char *path, const char *src, size_t len,
 191                        struct strbuf *buf, enum action action, enum safe_crlf checksafe)
 192 {
 193         struct text_stat stats;
 194         char *dst;
 195
 196         if (action == CRLF_BINARY ||
 197             (action == CRLF_GUESS && auto_crlf == AUTO_CRLF_FALSE) || !len)
 198                 return 0;
 199
 200         gather_stats(src, len, &stats);
 201
 202         if (action == CRLF_AUTO || action == CRLF_GUESS) {
 203                 /*
 204                  * We're currently not going to even try to convert stuff
 205                  * that has bare CR characters. Does anybody do that crazy
 206                  * stuff?
 207                  */
 208                 if (stats.cr != stats.crlf)
 209                         return 0;
 210
 211                 /*
 212                  * And add some heuristics for binary vs text, of course...
 213                  */
 214                 if (is_binary(len, &stats))
 215                         return 0;
 216
 217                 if (action == CRLF_GUESS) {
 218                         /*
 219                          * If the file in the index has any CR in it, do not convert.
 220                          * This is the new safer autocrlf handling.
 221                          */
 222                         if (has_cr_in_index(path))
 223                                 return 0;
 224                 }
 225         }
 226
 227         check_safe_crlf(path, action, &stats, checksafe);
 228
 229         /* Optimization: No CR? Nothing to convert, regardless. */
 230         if (!stats.cr)
 231                 return 0;
 232
 233         /* only grow if not in place */
 234         if (strbuf_avail(buf) + buf->len < len)
 235                 strbuf_grow(buf, len - buf->len);
 236         dst = buf->buf;
 237         if (action == CRLF_AUTO || action == CRLF_GUESS) {
 238                 /*
 239                  * If we guessed, we already know we rejected a file with
 240                  * lone CR, and we can strip a CR without looking at what
 241                  * follow it.
 242                  */
 243                 do {
 244                         unsigned char c = *src++;
 245                         if (c != '\r')
 246                                 *dst++ = c;
 247                 } while (--len);
 248         } else {
 249                 do {
 250                         unsigned char c = *src++;
 251                         if (! (c == '\r' && (1 < len && *src == '\n')))
 252                                 *dst++ = c;
 253                 } while (--len);
 254         }
 255         strbuf_setlen(buf, dst - buf->buf);
 256         return 1;
 257 }
 258
 259 static int crlf_to_worktree(const char *path, const char *src, size_t len,
 260                             struct strbuf *buf, enum action action)
 261 {
 262         char *to_free = NULL;
 263         struct text_stat stats;
 264
 265         if (!len || determine_output_conversion(action) != EOL_CRLF)
 266                 return 0;
 267
 268         gather_stats(src, len, &stats);
 269
 270         /* No LF? Nothing to convert, regardless. */
 271         if (!stats.lf)
 272                 return 0;
 273
 274         /* Was it already in CRLF format? */
 275         if (stats.lf == stats.crlf)
 276                 return 0;
 277
 278         if (action == CRLF_AUTO || action == CRLF_GUESS) {
 279                 if (action == CRLF_GUESS) {
 280                         /* If we have any CR or CRLF line endings, we do not touch it */
 281                         /* This is the new safer autocrlf-handling */
 282                         if (stats.cr > 0 || stats.crlf > 0)
 283                                 return 0;
 284                 }
 285
 286                 /* If we have any bare CR characters, we're not going to touch it */
 287                 if (stats.cr != stats.crlf)
 288                         return 0;
 289
 290                 if (is_binary(len, &stats))
 291                         return 0;
 292         }
 293
 294         /* are we "faking" in place editing ? */
 295         if (src == buf->buf)
 296                 to_free = strbuf_detach(buf, NULL);
 297
 298         strbuf_grow(buf, len + stats.lf - stats.crlf);
 299         for (;;) {
 300                 const char *nl = memchr(src, '\n', len);
 301                 if (!nl)
 302                         break;
 303                 if (nl > src && nl[-1] == '\r') {
 304                         strbuf_add(buf, src, nl + 1 - src);
 305                 } else {
 306                         strbuf_add(buf, src, nl - src);
 307                         strbuf_addstr(buf, "\r\n");
 308                 }
 309                 len -= nl + 1 - src;
 310                 src  = nl + 1;
 311         }
 312         strbuf_add(buf, src, len);
 313
 314         free(to_free);
 315         return 1;
 316 }
 317
 318 struct filter_params {
 319         const char *src;
 320         unsigned long size;
 321         const char *cmd;
 322         const char *path;
 323 };
 324
 325 static int filter_buffer(int in, int out, void *data)
 326 {
 327         /*
 328          * Spawn cmd and feed the buffer contents through its stdin.
 329          */
 330         struct child_process child_process;
 331         struct filter_params *params = (struct filter_params *)data;
 332         int write_err, status;
 333         const char *argv[] = { NULL, NULL };
 334
 335         /* apply % substitution to cmd */
 336         struct strbuf cmd = STRBUF_INIT;
 337         struct strbuf path = STRBUF_INIT;
 338         struct strbuf_expand_dict_entry dict[] = {
 339                 { "f", NULL, },
 340                 { NULL, NULL, },
 341         };
 342
 343         /* quote the path to preserve spaces, etc. */
 344         sq_quote_buf(&path, params->path);
 345         dict[0].value = path.buf;
 346
 347         /* expand all %f with the quoted path */
 348         strbuf_expand(&cmd, params->cmd, strbuf_expand_dict_cb, &dict);
 349         strbuf_release(&path);
 350
 351         argv[0] = cmd.buf;
 352
 353         memset(&child_process, 0, sizeof(child_process));
 354         child_process.argv = argv;
 355         child_process.use_shell = 1;
 356         child_process.in = -1;
 357         child_process.out = out;
 358
 359         if (start_command(&child_process))
 360                 return error("cannot fork to run external filter %s", params->cmd);
 361
 362         write_err = (write_in_full(child_process.in, params->src, params->size) < 0);
 363         if (close(child_process.in))
 364                 write_err = 1;
 365         if (write_err)
 366                 error("cannot feed the input to external filter %s", params->cmd);
 367
 368         status = finish_command(&child_process);
 369         if (status)
 370                 error("external filter %s failed %d", params->cmd, status);
 371
 372         strbuf_release(&cmd);
 373         return (write_err || status);
 374 }
 375
 376 static int apply_filter(const char *path, const char *src, size_t len,
 377                         struct strbuf *dst, const char *cmd)
 378 {
 379         /*
 380          * Create a pipeline to have the command filter the buffer's
 381          * contents.
 382          *
 383          * (child --> cmd) --> us
 384          */
 385         int ret = 1;
 386         struct strbuf nbuf = STRBUF_INIT;
 387         struct async async;
 388         struct filter_params params;
 389
 390         if (!cmd)
 391                 return 0;
 392
 393         memset(&async, 0, sizeof(async));
 394         async.proc = filter_buffer;
 395         async.data = &params;
 396         async.out = -1;
 397         params.src = src;
 398         params.size = len;
 399         params.cmd = cmd;
 400         params.path = path;
 401
 402         fflush(NULL);
 403         if (start_async(&async))
 404                 return 0;       /* error was already reported */
 405
 406         if (strbuf_read(&nbuf, async.out, len) < 0) {
 407                 error("read from external filter %s failed", cmd);
 408                 ret = 0;
 409         }
 410         if (close(async.out)) {
 411                 error("read from external filter %s failed", cmd);
 412                 ret = 0;
 413         }
 414         if (finish_async(&async)) {
 415                 error("external filter %s failed", cmd);
 416                 ret = 0;
 417         }
 418
 419         if (ret) {
 420                 strbuf_swap(dst, &nbuf);
 421         }
 422         strbuf_release(&nbuf);
 423         return ret;
 424 }
 425
 426 static struct convert_driver {
 427         const char *name;
 428         struct convert_driver *next;
 429         const char *smudge;
 430         const char *clean;
 431 } *user_convert, **user_convert_tail;
 432
 433 static int read_convert_config(const char *var, const char *value, void *cb)
 434 {
 435         const char *ep, *name;
 436         int namelen;
 437         struct convert_driver *drv;
 438
 439         /*
 440          * External conversion drivers are configured using
 441          * "filter.<name>.variable".
 442          */
 443         if (prefixcmp(var, "filter.") || (ep = strrchr(var, '.')) == var + 6)
 444                 return 0;
 445         name = var + 7;
 446         namelen = ep - name;
 447         for (drv = user_convert; drv; drv = drv->next)
 448                 if (!strncmp(drv->name, name, namelen) && !drv->name[namelen])
 449                         break;
 450         if (!drv) {
 451                 drv = xcalloc(1, sizeof(struct convert_driver));
 452                 drv->name = xmemdupz(name, namelen);
 453                 *user_convert_tail = drv;
 454                 user_convert_tail = &(drv->next);
 455         }
 456
 457         ep++;
 458
 459         /*
 460          * filter.<name>.smudge and filter.<name>.clean specifies
 461          * the command line:
 462          *
 463          *      command-line
 464          *
 465          * The command-line will not be interpolated in any way.
 466          */
 467
 468         if (!strcmp("smudge", ep))
 469                 return git_config_string(&drv->smudge, var, value);
 470
 471         if (!strcmp("clean", ep))
 472                 return git_config_string(&drv->clean, var, value);
 473
 474         return 0;
 475 }
 476
 477 static void setup_convert_check(struct git_attr_check *check)
 478 {
 479         static struct git_attr *attr_text;
 480         static struct git_attr *attr_crlf;
 481         static struct git_attr *attr_eol;
 482         static struct git_attr *attr_ident;
 483         static struct git_attr *attr_filter;
 484
 485         if (!attr_text) {
 486                 attr_text = git_attr("text");
 487                 attr_crlf = git_attr("crlf");
 488                 attr_eol = git_attr("eol");
 489                 attr_ident = git_attr("ident");
 490                 attr_filter = git_attr("filter");
 491                 user_convert_tail = &user_convert;
 492                 git_config(read_convert_config, NULL);
 493         }
 494         check[0].attr = attr_crlf;
 495         check[1].attr = attr_ident;
 496         check[2].attr = attr_filter;
 497         check[3].attr = attr_eol;
 498         check[4].attr = attr_text;
 499 }
 500
 501 static int count_ident(const char *cp, unsigned long size)
 502 {
 503         /*
 504          * "$Id: 0000000000000000000000000000000000000000 $" <=> "$Id$"
 505          */
 506         int cnt = 0;
 507         char ch;
 508
 509         while (size) {
 510                 ch = *cp++;
 511                 size--;
 512                 if (ch != '$')
 513                         continue;
 514                 if (size < 3)
 515                         break;
 516                 if (memcmp("Id", cp, 2))
 517                         continue;
 518                 ch = cp[2];
 519                 cp += 3;
 520                 size -= 3;
 521                 if (ch == '$')
 522                         cnt++; /* $Id$ */
 523                 if (ch != ':')
 524                         continue;
 525
 526                 /*
 527                  * "$Id: ... "; scan up to the closing dollar sign and discard.
 528                  */
 529                 while (size) {
 530                         ch = *cp++;
 531                         size--;
 532                         if (ch == '$') {
 533                                 cnt++;
 534                                 break;
 535                         }
 536                         if (ch == '\n')
 537                                 break;
 538                 }
 539         }
 540         return cnt;
 541 }
 542
 543 static int ident_to_git(const char *path, const char *src, size_t len,
 544                         struct strbuf *buf, int ident)
 545 {
 546         char *dst, *dollar;
 547
 548         if (!ident || !count_ident(src, len))
 549                 return 0;
 550
 551         /* only grow if not in place */
 552         if (strbuf_avail(buf) + buf->len < len)
 553                 strbuf_grow(buf, len - buf->len);
 554         dst = buf->buf;
 555         for (;;) {
 556                 dollar = memchr(src, '$', len);
 557                 if (!dollar)
 558                         break;
 559                 memcpy(dst, src, dollar + 1 - src);
 560                 dst += dollar + 1 - src;
 561                 len -= dollar + 1 - src;
 562                 src  = dollar + 1;
 563
 564                 if (len > 3 && !memcmp(src, "Id:", 3)) {
 565                         dollar = memchr(src + 3, '$', len - 3);
 566                         if (!dollar)
 567                                 break;
 568                         if (memchr(src + 3, '\n', dollar - src - 3)) {
 569                                 /* Line break before the next dollar. */
 570                                 continue;
 571                         }
 572
 573                         memcpy(dst, "Id$", 3);
 574                         dst += 3;
 575                         len -= dollar + 1 - src;
 576                         src  = dollar + 1;
 577                 }
 578         }
 579         memcpy(dst, src, len);
 580         strbuf_setlen(buf, dst + len - buf->buf);
 581         return 1;
 582 }
 583
 584 static int ident_to_worktree(const char *path, const char *src, size_t len,
 585                              struct strbuf *buf, int ident)
 586 {
 587         unsigned char sha1[20];
 588         char *to_free = NULL, *dollar, *spc;
 589         int cnt;
 590
 591         if (!ident)
 592                 return 0;
 593
 594         cnt = count_ident(src, len);
 595         if (!cnt)
 596                 return 0;
 597
 598         /* are we "faking" in place editing ? */
 599         if (src == buf->buf)
 600                 to_free = strbuf_detach(buf, NULL);
 601         hash_sha1_file(src, len, "blob", sha1);
 602
 603         strbuf_grow(buf, len + cnt * 43);
 604         for (;;) {
 605                 /* step 1: run to the next '$' */
 606                 dollar = memchr(src, '$', len);
 607                 if (!dollar)
 608                         break;
 609                 strbuf_add(buf, src, dollar + 1 - src);
 610                 len -= dollar + 1 - src;
 611                 src  = dollar + 1;
 612
 613                 /* step 2: does it looks like a bit like Id:xxx$ or Id$ ? */
 614                 if (len < 3 || memcmp("Id", src, 2))
 615                         continue;
 616
 617                 /* step 3: skip over Id$ or Id:xxxxx$ */
 618                 if (src[2] == '$') {
 619                         src += 3;
 620                         len -= 3;
 621                 } else if (src[2] == ':') {
 622                         /*
 623                          * It's possible that an expanded Id has crept its way into the
 624                          * repository, we cope with that by stripping the expansion out.
 625                          * This is probably not a good idea, since it will cause changes
 626                          * on checkout, which won't go away by stash, but let's keep it
 627                          * for git-style ids.
 628                          */
 629                         dollar = memchr(src + 3, '$', len - 3);
 630                         if (!dollar) {
 631                                 /* incomplete keyword, no more '$', so just quit the loop */
 632                                 break;
 633                         }
 634
 635                         if (memchr(src + 3, '\n', dollar - src - 3)) {
 636                                 /* Line break before the next dollar. */
 637                                 continue;
 638                         }
 639
 640                         spc = memchr(src + 4, ' ', dollar - src - 4);
 641                         if (spc && spc < dollar-1) {
 642                                 /* There are spaces in unexpected places.
 643                                  * This is probably an id from some other
 644                                  * versioning system. Keep it for now.
 645                                  */
 646                                 continue;
 647                         }
 648
 649                         len -= dollar + 1 - src;
 650                         src  = dollar + 1;
 651                 } else {
 652                         /* it wasn't a "Id$" or "Id:xxxx$" */
 653                         continue;
 654                 }
 655
 656                 /* step 4: substitute */
 657                 strbuf_addstr(buf, "Id: ");
 658                 strbuf_add(buf, sha1_to_hex(sha1), 40);
 659                 strbuf_addstr(buf, " $");
 660         }
 661         strbuf_add(buf, src, len);
 662
 663         free(to_free);
 664         return 1;
 665 }
 666
 667 static int git_path_check_crlf(const char *path, struct git_attr_check *check)
 668 {
 669         const char *value = check->value;
 670
 671         if (ATTR_TRUE(value))
 672                 return CRLF_TEXT;
 673         else if (ATTR_FALSE(value))
 674                 return CRLF_BINARY;
 675         else if (ATTR_UNSET(value))
 676                 ;
 677         else if (!strcmp(value, "input"))
 678                 return CRLF_INPUT;
 679         else if (!strcmp(value, "auto"))
 680                 return CRLF_AUTO;
 681         return CRLF_GUESS;
 682 }
 683
 684 static int git_path_check_eol(const char *path, struct git_attr_check *check)
 685 {
 686         const char *value = check->value;
 687
 688         if (ATTR_UNSET(value))
 689                 ;
 690         else if (!strcmp(value, "lf"))
 691                 return EOL_LF;
 692         else if (!strcmp(value, "crlf"))
 693                 return EOL_CRLF;
 694         return EOL_UNSET;
 695 }
 696
 697 static struct convert_driver *git_path_check_convert(const char *path,
 698                                              struct git_attr_check *check)
 699 {
 700         const char *value = check->value;
 701         struct convert_driver *drv;
 702
 703         if (ATTR_TRUE(value) || ATTR_FALSE(value) || ATTR_UNSET(value))
 704                 return NULL;
 705         for (drv = user_convert; drv; drv = drv->next)
 706                 if (!strcmp(value, drv->name))
 707                         return drv;
 708         return NULL;
 709 }
 710
 711 static int git_path_check_ident(const char *path, struct git_attr_check *check)
 712 {
 713         const char *value = check->value;
 714
 715         return !!ATTR_TRUE(value);
 716 }
 717
 718 static enum action determine_action(enum action text_attr, enum eol eol_attr)
 719 {
 720         if (text_attr == CRLF_BINARY)
 721                 return CRLF_BINARY;
 722         if (eol_attr == EOL_LF)
 723                 return CRLF_INPUT;
 724         if (eol_attr == EOL_CRLF)
 725                 return CRLF_CRLF;
 726         return text_attr;
 727 }
 728
 729 int convert_to_git(const char *path, const char *src, size_t len,
 730                    struct strbuf *dst, enum safe_crlf checksafe)
 731 {
 732         struct git_attr_check check[5];
 733         enum action action = CRLF_GUESS;
 734         enum eol eol_attr = EOL_UNSET;
 735         int ident = 0, ret = 0;
 736         const char *filter = NULL;
 737
 738         setup_convert_check(check);
 739         if (!git_checkattr(path, ARRAY_SIZE(check), check)) {
 740                 struct convert_driver *drv;
 741                 action = git_path_check_crlf(path, check + 4);
 742                 if (action == CRLF_GUESS)
 743                         action = git_path_check_crlf(path, check + 0);
 744                 ident = git_path_check_ident(path, check + 1);
 745                 drv = git_path_check_convert(path, check + 2);
 746                 eol_attr = git_path_check_eol(path, check + 3);
 747                 if (drv && drv->clean)
 748                         filter = drv->clean;
 749         }
 750
 751         ret |= apply_filter(path, src, len, dst, filter);
 752         if (ret) {
 753                 src = dst->buf;
 754                 len = dst->len;
 755         }
 756         action = determine_action(action, eol_attr);
 757         ret |= crlf_to_git(path, src, len, dst, action, checksafe);
 758         if (ret) {
 759                 src = dst->buf;
 760                 len = dst->len;
 761         }
 762         return ret | ident_to_git(path, src, len, dst, ident);
 763 }
 764
 765 static int convert_to_working_tree_internal(const char *path, const char *src,
 766                                             size_t len, struct strbuf *dst,
 767                                             int normalizing)
 768 {
 769         struct git_attr_check check[5];
 770         enum action action = CRLF_GUESS;
 771         enum eol eol_attr = EOL_UNSET;
 772         int ident = 0, ret = 0;
 773         const char *filter = NULL;
 774
 775         setup_convert_check(check);
 776         if (!git_checkattr(path, ARRAY_SIZE(check), check)) {
 777                 struct convert_driver *drv;
 778                 action = git_path_check_crlf(path, check + 4);
 779                 if (action == CRLF_GUESS)
 780                         action = git_path_check_crlf(path, check + 0);
 781                 ident = git_path_check_ident(path, check + 1);
 782                 drv = git_path_check_convert(path, check + 2);
 783                 eol_attr = git_path_check_eol(path, check + 3);
 784                 if (drv && drv->smudge)
 785                         filter = drv->smudge;
 786         }
 787
 788         ret |= ident_to_worktree(path, src, len, dst, ident);
 789         if (ret) {
 790                 src = dst->buf;
 791                 len = dst->len;
 792         }
 793         /*
 794          * CRLF conversion can be skipped if normalizing, unless there
 795          * is a smudge filter.  The filter might expect CRLFs.
 796          */
 797         if (filter || !normalizing) {
 798                 action = determine_action(action, eol_attr);
 799                 ret |= crlf_to_worktree(path, src, len, dst, action);
 800                 if (ret) {
 801                         src = dst->buf;
 802                         len = dst->len;
 803                 }
 804         }
 805         return ret | apply_filter(path, src, len, dst, filter);
 806 }
 807
 808 int convert_to_working_tree(const char *path, const char *src, size_t len, struct strbuf *dst)
 809 {
 810         return convert_to_working_tree_internal(path, src, len, dst, 0);
 811 }
 812
 813 int renormalize_buffer(const char *path, const char *src, size_t len, struct strbuf *dst)
 814 {
 815         int ret = convert_to_working_tree_internal(path, src, len, dst, 1);
 816         if (ret) {
 817                 src = dst->buf;
 818                 len = dst->len;
 819         }
 820         return ret | convert_to_git(path, src, len, dst, 0);
 821 }