1 /*- 2 * Copyright 1986, Larry Wall 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following condition is met: 6 * 1. Redistributions of source code must retain the above copyright notice, 7 * this condition and the following disclaimer. 8 * 9 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY 10 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 11 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 12 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR 13 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 14 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 15 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 16 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 17 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 18 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 19 * SUCH DAMAGE. 20 * 21 * patch - a program to apply diffs to original files 22 * 23 * -C option added in 1998, original code by Marc Espie, based on FreeBSD 24 * behaviour 25 * 26 * $OpenBSD: patch.c,v 1.54 2014/12/13 10:31:07 tobias Exp $ 27 * $FreeBSD$ 28 * 29 */ 30 31 #include <sys/types.h> 32 #include <sys/stat.h> 33 34 #include <ctype.h> 35 #include <getopt.h> 36 #include <limits.h> 37 #include <stdio.h> 38 #include <string.h> 39 #include <stdlib.h> 40 #include <unistd.h> 41 42 #include "common.h" 43 #include "util.h" 44 #include "pch.h" 45 #include "inp.h" 46 #include "backupfile.h" 47 #include "pathnames.h" 48 49 mode_t filemode = 0644; 50 51 char *buf; /* general purpose buffer */ 52 size_t buf_size; /* size of the general purpose buffer */ 53 54 bool using_plan_a = true; /* try to keep everything in memory */ 55 bool out_of_mem = false; /* ran out of memory in plan a */ 56 bool nonempty_patchf_seen = false; /* seen nonempty patch file? */ 57 58 #define MAXFILEC 2 59 60 char *filearg[MAXFILEC]; 61 bool ok_to_create_file = false; 62 char *outname = NULL; 63 char *origprae = NULL; 64 char *TMPOUTNAME; 65 char *TMPINNAME; 66 char *TMPREJNAME; 67 char *TMPPATNAME; 68 bool toutkeep = false; 69 bool trejkeep = false; 70 bool warn_on_invalid_line; 71 bool last_line_missing_eol; 72 73 #ifdef DEBUGGING 74 int debug = 0; 75 #endif 76 77 bool force = false; 78 bool batch = false; 79 bool verbose = true; 80 bool reverse = false; 81 bool noreverse = false; 82 bool skip_rest_of_patch = false; 83 int strippath = 957; 84 bool canonicalize = false; 85 bool check_only = false; 86 int diff_type = 0; 87 char *revision = NULL; /* prerequisite revision, if any */ 88 LINENUM input_lines = 0; /* how long is input file in lines */ 89 int posix = 0; /* strict POSIX mode? */ 90 91 static void reinitialize_almost_everything(void); 92 static void get_some_switches(void); 93 static LINENUM locate_hunk(LINENUM); 94 static void abort_context_hunk(void); 95 static void rej_line(int, LINENUM); 96 static void abort_hunk(void); 97 static void apply_hunk(LINENUM); 98 static void init_output(const char *); 99 static void init_reject(const char *); 100 static void copy_till(LINENUM, bool); 101 static bool spew_output(void); 102 static void dump_line(LINENUM, bool); 103 static bool patch_match(LINENUM, LINENUM, LINENUM); 104 static bool similar(const char *, const char *, int); 105 static void usage(void); 106 107 /* true if -E was specified on command line. */ 108 static bool remove_empty_files = false; 109 110 /* true if -R was specified on command line. */ 111 static bool reverse_flag_specified = false; 112 113 static bool Vflag = false; 114 115 /* buffer holding the name of the rejected patch file. */ 116 static char rejname[PATH_MAX]; 117 118 /* how many input lines have been irretractibly output */ 119 static LINENUM last_frozen_line = 0; 120 121 static int Argc; /* guess */ 122 static char **Argv; 123 static int Argc_last; /* for restarting plan_b */ 124 static char **Argv_last; 125 126 static FILE *ofp = NULL; /* output file pointer */ 127 static FILE *rejfp = NULL; /* reject file pointer */ 128 129 static int filec = 0; /* how many file arguments? */ 130 static LINENUM last_offset = 0; 131 static LINENUM maxfuzz = 2; 132 133 /* patch using ifdef, ifndef, etc. */ 134 static bool do_defines = false; 135 /* #ifdef xyzzy */ 136 static char if_defined[128]; 137 /* #ifndef xyzzy */ 138 static char not_defined[128]; 139 /* #else */ 140 static const char else_defined[] = "#else\n"; 141 /* #endif xyzzy */ 142 static char end_defined[128]; 143 144 145 /* Apply a set of diffs as appropriate. */ 146 147 int 148 main(int argc, char *argv[]) 149 { 150 int error = 0, hunk, failed, i, fd; 151 bool patch_seen, reverse_seen; 152 LINENUM where = 0, newwhere, fuzz, mymaxfuzz; 153 const char *tmpdir; 154 char *v; 155 156 setvbuf(stdout, NULL, _IOLBF, 0); 157 setvbuf(stderr, NULL, _IOLBF, 0); 158 for (i = 0; i < MAXFILEC; i++) 159 filearg[i] = NULL; 160 161 buf_size = INITLINELEN; 162 buf = malloc((unsigned)(buf_size)); 163 if (buf == NULL) 164 fatal("out of memory\n"); 165 166 /* Cons up the names of the temporary files. */ 167 if ((tmpdir = getenv("TMPDIR")) == NULL || *tmpdir == '\0') 168 tmpdir = _PATH_TMP; 169 for (i = strlen(tmpdir) - 1; i > 0 && tmpdir[i] == '/'; i--) 170 ; 171 i++; 172 if (asprintf(&TMPOUTNAME, "%.*s/patchoXXXXXXXXXX", i, tmpdir) == -1) 173 fatal("cannot allocate memory"); 174 if ((fd = mkstemp(TMPOUTNAME)) < 0) 175 pfatal("can't create %s", TMPOUTNAME); 176 close(fd); 177 178 if (asprintf(&TMPINNAME, "%.*s/patchiXXXXXXXXXX", i, tmpdir) == -1) 179 fatal("cannot allocate memory"); 180 if ((fd = mkstemp(TMPINNAME)) < 0) 181 pfatal("can't create %s", TMPINNAME); 182 close(fd); 183 184 if (asprintf(&TMPREJNAME, "%.*s/patchrXXXXXXXXXX", i, tmpdir) == -1) 185 fatal("cannot allocate memory"); 186 if ((fd = mkstemp(TMPREJNAME)) < 0) 187 pfatal("can't create %s", TMPREJNAME); 188 close(fd); 189 190 if (asprintf(&TMPPATNAME, "%.*s/patchpXXXXXXXXXX", i, tmpdir) == -1) 191 fatal("cannot allocate memory"); 192 if ((fd = mkstemp(TMPPATNAME)) < 0) 193 pfatal("can't create %s", TMPPATNAME); 194 close(fd); 195 196 v = getenv("SIMPLE_BACKUP_SUFFIX"); 197 if (v) 198 simple_backup_suffix = v; 199 else 200 simple_backup_suffix = ORIGEXT; 201 202 /* parse switches */ 203 Argc = argc; 204 Argv = argv; 205 get_some_switches(); 206 207 if (!Vflag) { 208 if ((v = getenv("PATCH_VERSION_CONTROL")) == NULL) 209 v = getenv("VERSION_CONTROL"); 210 if (v != NULL || !posix) 211 backup_type = get_version(v); /* OK to pass NULL. */ 212 } 213 214 /* make sure we clean up /tmp in case of disaster */ 215 set_signals(0); 216 217 patch_seen = false; 218 for (open_patch_file(filearg[1]); there_is_another_patch(); 219 reinitialize_almost_everything()) { 220 /* for each patch in patch file */ 221 222 patch_seen = true; 223 224 warn_on_invalid_line = true; 225 226 if (outname == NULL) 227 outname = xstrdup(filearg[0]); 228 229 /* for ed script just up and do it and exit */ 230 if (diff_type == ED_DIFF) { 231 do_ed_script(); 232 continue; 233 } 234 /* initialize the patched file */ 235 if (!skip_rest_of_patch) 236 init_output(TMPOUTNAME); 237 238 /* initialize reject file */ 239 init_reject(TMPREJNAME); 240 241 /* find out where all the lines are */ 242 if (!skip_rest_of_patch) 243 scan_input(filearg[0]); 244 245 /* 246 * from here on, open no standard i/o files, because 247 * malloc might misfire and we can't catch it easily 248 */ 249 250 /* apply each hunk of patch */ 251 hunk = 0; 252 failed = 0; 253 reverse_seen = false; 254 out_of_mem = false; 255 while (another_hunk()) { 256 hunk++; 257 fuzz = 0; 258 mymaxfuzz = pch_context(); 259 if (maxfuzz < mymaxfuzz) 260 mymaxfuzz = maxfuzz; 261 if (!skip_rest_of_patch) { 262 do { 263 where = locate_hunk(fuzz); 264 if (hunk == 1 && where == 0 && !force && !reverse_seen) { 265 /* dwim for reversed patch? */ 266 if (!pch_swap()) { 267 if (fuzz == 0) 268 say("Not enough memory to try swapped hunk! Assuming unswapped.\n"); 269 continue; 270 } 271 reverse = !reverse; 272 /* try again */ 273 where = locate_hunk(fuzz); 274 if (where == 0) { 275 /* didn't find it swapped */ 276 if (!pch_swap()) 277 /* put it back to normal */ 278 fatal("lost hunk on alloc error!\n"); 279 reverse = !reverse; 280 } else if (noreverse) { 281 if (!pch_swap()) 282 /* put it back to normal */ 283 fatal("lost hunk on alloc error!\n"); 284 reverse = !reverse; 285 say("Ignoring previously applied (or reversed) patch.\n"); 286 skip_rest_of_patch = true; 287 } else if (batch) { 288 if (verbose) 289 say("%seversed (or previously applied) patch detected! %s -R.", 290 reverse ? "R" : "Unr", 291 reverse ? "Assuming" : "Ignoring"); 292 } else { 293 ask("%seversed (or previously applied) patch detected! %s -R? [y] ", 294 reverse ? "R" : "Unr", 295 reverse ? "Assume" : "Ignore"); 296 if (*buf == 'n') { 297 ask("Apply anyway? [n] "); 298 if (*buf != 'y') 299 skip_rest_of_patch = true; 300 else 301 reverse_seen = true; 302 where = 0; 303 reverse = !reverse; 304 if (!pch_swap()) 305 /* put it back to normal */ 306 fatal("lost hunk on alloc error!\n"); 307 } 308 } 309 } 310 } while (!skip_rest_of_patch && where == 0 && 311 ++fuzz <= mymaxfuzz); 312 313 if (skip_rest_of_patch) { /* just got decided */ 314 if (ferror(ofp) || fclose(ofp)) { 315 say("Error writing %s\n", 316 TMPOUTNAME); 317 error = 1; 318 } 319 ofp = NULL; 320 } 321 } 322 newwhere = pch_newfirst() + last_offset; 323 if (skip_rest_of_patch) { 324 abort_hunk(); 325 failed++; 326 if (verbose) 327 say("Hunk #%d ignored at %ld.\n", 328 hunk, newwhere); 329 } else if (where == 0) { 330 abort_hunk(); 331 failed++; 332 if (verbose) 333 say("Hunk #%d failed at %ld.\n", 334 hunk, newwhere); 335 } else { 336 apply_hunk(where); 337 if (verbose) { 338 say("Hunk #%d succeeded at %ld", 339 hunk, newwhere); 340 if (fuzz != 0) 341 say(" with fuzz %ld", fuzz); 342 if (last_offset) 343 say(" (offset %ld line%s)", 344 last_offset, 345 last_offset == 1L ? "" : "s"); 346 say(".\n"); 347 } 348 } 349 } 350 351 if (out_of_mem && using_plan_a) { 352 Argc = Argc_last; 353 Argv = Argv_last; 354 say("\n\nRan out of memory using Plan A--trying again...\n\n"); 355 if (ofp) 356 fclose(ofp); 357 ofp = NULL; 358 if (rejfp) 359 fclose(rejfp); 360 rejfp = NULL; 361 continue; 362 } 363 if (hunk == 0) 364 fatal("Internal error: hunk should not be 0\n"); 365 366 /* finish spewing out the new file */ 367 if (!skip_rest_of_patch && !spew_output()) { 368 say("Can't write %s\n", TMPOUTNAME); 369 error = 1; 370 } 371 372 /* and put the output where desired */ 373 ignore_signals(); 374 if (!skip_rest_of_patch) { 375 struct stat statbuf; 376 char *realout = outname; 377 378 if (!check_only) { 379 if (move_file(TMPOUTNAME, outname) < 0) { 380 toutkeep = true; 381 realout = TMPOUTNAME; 382 chmod(TMPOUTNAME, filemode); 383 } else 384 chmod(outname, filemode); 385 386 if (remove_empty_files && 387 stat(realout, &statbuf) == 0 && 388 statbuf.st_size == 0) { 389 if (verbose) 390 say("Removing %s (empty after patching).\n", 391 realout); 392 unlink(realout); 393 } 394 } 395 } 396 if (ferror(rejfp) || fclose(rejfp)) { 397 say("Error writing %s\n", rejname); 398 error = 1; 399 } 400 rejfp = NULL; 401 if (failed) { 402 error = 1; 403 if (*rejname == '\0') { 404 if (strlcpy(rejname, outname, 405 sizeof(rejname)) >= sizeof(rejname)) 406 fatal("filename %s is too long\n", outname); 407 if (strlcat(rejname, REJEXT, 408 sizeof(rejname)) >= sizeof(rejname)) 409 fatal("filename %s is too long\n", outname); 410 } 411 if (!check_only) 412 say("%d out of %d hunks %s--saving rejects to %s\n", 413 failed, hunk, skip_rest_of_patch ? "ignored" : "failed", rejname); 414 else 415 say("%d out of %d hunks %s while patching %s\n", 416 failed, hunk, skip_rest_of_patch ? "ignored" : "failed", filearg[0]); 417 if (!check_only && move_file(TMPREJNAME, rejname) < 0) 418 trejkeep = true; 419 } 420 set_signals(1); 421 } 422 423 if (!patch_seen && nonempty_patchf_seen) 424 error = 2; 425 426 my_exit(error); 427 /* NOTREACHED */ 428 } 429 430 /* Prepare to find the next patch to do in the patch file. */ 431 432 static void 433 reinitialize_almost_everything(void) 434 { 435 re_patch(); 436 re_input(); 437 438 input_lines = 0; 439 last_frozen_line = 0; 440 441 filec = 0; 442 if (!out_of_mem) { 443 free(filearg[0]); 444 filearg[0] = NULL; 445 } 446 447 free(outname); 448 outname = NULL; 449 450 last_offset = 0; 451 diff_type = 0; 452 453 free(revision); 454 revision = NULL; 455 456 reverse = reverse_flag_specified; 457 skip_rest_of_patch = false; 458 459 get_some_switches(); 460 } 461 462 /* Process switches and filenames. */ 463 464 static void 465 get_some_switches(void) 466 { 467 const char *options = "b::B:cCd:D:eEfF:i:lnNo:p:r:RstuvV:x:z:"; 468 static struct option longopts[] = { 469 {"backup", no_argument, 0, 'b'}, 470 {"batch", no_argument, 0, 't'}, 471 {"check", no_argument, 0, 'C'}, 472 {"context", no_argument, 0, 'c'}, 473 {"debug", required_argument, 0, 'x'}, 474 {"directory", required_argument, 0, 'd'}, 475 {"dry-run", no_argument, 0, 'C'}, 476 {"ed", no_argument, 0, 'e'}, 477 {"force", no_argument, 0, 'f'}, 478 {"forward", no_argument, 0, 'N'}, 479 {"fuzz", required_argument, 0, 'F'}, 480 {"ifdef", required_argument, 0, 'D'}, 481 {"input", required_argument, 0, 'i'}, 482 {"ignore-whitespace", no_argument, 0, 'l'}, 483 {"normal", no_argument, 0, 'n'}, 484 {"output", required_argument, 0, 'o'}, 485 {"prefix", required_argument, 0, 'B'}, 486 {"quiet", no_argument, 0, 's'}, 487 {"reject-file", required_argument, 0, 'r'}, 488 {"remove-empty-files", no_argument, 0, 'E'}, 489 {"reverse", no_argument, 0, 'R'}, 490 {"silent", no_argument, 0, 's'}, 491 {"strip", required_argument, 0, 'p'}, 492 {"suffix", required_argument, 0, 'z'}, 493 {"unified", no_argument, 0, 'u'}, 494 {"version", no_argument, 0, 'v'}, 495 {"version-control", required_argument, 0, 'V'}, 496 {"posix", no_argument, &posix, 1}, 497 {NULL, 0, 0, 0} 498 }; 499 int ch; 500 501 rejname[0] = '\0'; 502 Argc_last = Argc; 503 Argv_last = Argv; 504 if (!Argc) 505 return; 506 optreset = optind = 1; 507 while ((ch = getopt_long(Argc, Argv, options, longopts, NULL)) != -1) { 508 switch (ch) { 509 case 'b': 510 if (backup_type == none) 511 backup_type = numbered_existing; 512 if (optarg == NULL) 513 break; 514 if (verbose) 515 say("Warning, the ``-b suffix'' option has been" 516 " obsoleted by the -z option.\n"); 517 /* FALLTHROUGH */ 518 case 'z': 519 /* must directly follow 'b' case for backwards compat */ 520 simple_backup_suffix = xstrdup(optarg); 521 break; 522 case 'B': 523 origprae = xstrdup(optarg); 524 break; 525 case 'c': 526 diff_type = CONTEXT_DIFF; 527 break; 528 case 'C': 529 check_only = true; 530 break; 531 case 'd': 532 if (chdir(optarg) < 0) 533 pfatal("can't cd to %s", optarg); 534 break; 535 case 'D': 536 do_defines = true; 537 if (!isalpha((unsigned char)*optarg) && *optarg != '_') 538 fatal("argument to -D is not an identifier\n"); 539 snprintf(if_defined, sizeof if_defined, 540 "#ifdef %s\n", optarg); 541 snprintf(not_defined, sizeof not_defined, 542 "#ifndef %s\n", optarg); 543 snprintf(end_defined, sizeof end_defined, 544 "#endif /* %s */\n", optarg); 545 break; 546 case 'e': 547 diff_type = ED_DIFF; 548 break; 549 case 'E': 550 remove_empty_files = true; 551 break; 552 case 'f': 553 force = true; 554 break; 555 case 'F': 556 maxfuzz = atoi(optarg); 557 break; 558 case 'i': 559 if (++filec == MAXFILEC) 560 fatal("too many file arguments\n"); 561 filearg[filec] = xstrdup(optarg); 562 break; 563 case 'l': 564 canonicalize = true; 565 break; 566 case 'n': 567 diff_type = NORMAL_DIFF; 568 break; 569 case 'N': 570 noreverse = true; 571 break; 572 case 'o': 573 outname = xstrdup(optarg); 574 break; 575 case 'p': 576 strippath = atoi(optarg); 577 break; 578 case 'r': 579 if (strlcpy(rejname, optarg, 580 sizeof(rejname)) >= sizeof(rejname)) 581 fatal("argument for -r is too long\n"); 582 break; 583 case 'R': 584 reverse = true; 585 reverse_flag_specified = true; 586 break; 587 case 's': 588 verbose = false; 589 break; 590 case 't': 591 batch = true; 592 break; 593 case 'u': 594 diff_type = UNI_DIFF; 595 break; 596 case 'v': 597 version(); 598 break; 599 case 'V': 600 backup_type = get_version(optarg); 601 Vflag = true; 602 break; 603 #ifdef DEBUGGING 604 case 'x': 605 debug = atoi(optarg); 606 break; 607 #endif 608 default: 609 if (ch != '\0') 610 usage(); 611 break; 612 } 613 } 614 Argc -= optind; 615 Argv += optind; 616 617 if (Argc > 0) { 618 filearg[0] = xstrdup(*Argv++); 619 Argc--; 620 while (Argc > 0) { 621 if (++filec == MAXFILEC) 622 fatal("too many file arguments\n"); 623 filearg[filec] = xstrdup(*Argv++); 624 Argc--; 625 } 626 } 627 628 if (getenv("POSIXLY_CORRECT") != NULL) 629 posix = 1; 630 } 631 632 static void 633 usage(void) 634 { 635 fprintf(stderr, 636 "usage: patch [-bCcEeflNnRstuv] [-B backup-prefix] [-D symbol] [-d directory]\n" 637 " [-F max-fuzz] [-i patchfile] [-o out-file] [-p strip-count]\n" 638 " [-r rej-name] [-V t | nil | never | none] [-x number]\n" 639 " [-z backup-ext] [--posix] [origfile [patchfile]]\n" 640 " patch <patchfile\n"); 641 my_exit(EXIT_FAILURE); 642 } 643 644 /* 645 * Attempt to find the right place to apply this hunk of patch. 646 */ 647 static LINENUM 648 locate_hunk(LINENUM fuzz) 649 { 650 LINENUM first_guess = pch_first() + last_offset; 651 LINENUM offset; 652 LINENUM pat_lines = pch_ptrn_lines(); 653 LINENUM max_pos_offset = input_lines - first_guess - pat_lines + 1; 654 LINENUM max_neg_offset = first_guess - last_frozen_line - 1 + pch_context(); 655 656 if (pat_lines == 0) { /* null range matches always */ 657 if (verbose && fuzz == 0 && (diff_type == CONTEXT_DIFF 658 || diff_type == NEW_CONTEXT_DIFF 659 || diff_type == UNI_DIFF)) { 660 say("Empty context always matches.\n"); 661 } 662 return (first_guess); 663 } 664 if (max_neg_offset >= first_guess) /* do not try lines < 0 */ 665 max_neg_offset = first_guess - 1; 666 if (first_guess <= input_lines && patch_match(first_guess, 0, fuzz)) 667 return first_guess; 668 for (offset = 1; ; offset++) { 669 bool check_after = (offset <= max_pos_offset); 670 bool check_before = (offset <= max_neg_offset); 671 672 if (check_after && patch_match(first_guess, offset, fuzz)) { 673 #ifdef DEBUGGING 674 if (debug & 1) 675 say("Offset changing from %ld to %ld\n", 676 last_offset, offset); 677 #endif 678 last_offset = offset; 679 return first_guess + offset; 680 } else if (check_before && patch_match(first_guess, -offset, fuzz)) { 681 #ifdef DEBUGGING 682 if (debug & 1) 683 say("Offset changing from %ld to %ld\n", 684 last_offset, -offset); 685 #endif 686 last_offset = -offset; 687 return first_guess - offset; 688 } else if (!check_before && !check_after) 689 return 0; 690 } 691 } 692 693 /* We did not find the pattern, dump out the hunk so they can handle it. */ 694 695 static void 696 abort_context_hunk(void) 697 { 698 LINENUM i; 699 const LINENUM pat_end = pch_end(); 700 /* 701 * add in last_offset to guess the same as the previous successful 702 * hunk 703 */ 704 const LINENUM oldfirst = pch_first() + last_offset; 705 const LINENUM newfirst = pch_newfirst() + last_offset; 706 const LINENUM oldlast = oldfirst + pch_ptrn_lines() - 1; 707 const LINENUM newlast = newfirst + pch_repl_lines() - 1; 708 const char *stars = (diff_type >= NEW_CONTEXT_DIFF ? " ****" : ""); 709 const char *minuses = (diff_type >= NEW_CONTEXT_DIFF ? " ----" : " -----"); 710 711 fprintf(rejfp, "***************\n"); 712 for (i = 0; i <= pat_end; i++) { 713 switch (pch_char(i)) { 714 case '*': 715 if (oldlast < oldfirst) 716 fprintf(rejfp, "*** 0%s\n", stars); 717 else if (oldlast == oldfirst) 718 fprintf(rejfp, "*** %ld%s\n", oldfirst, stars); 719 else 720 fprintf(rejfp, "*** %ld,%ld%s\n", oldfirst, 721 oldlast, stars); 722 break; 723 case '=': 724 if (newlast < newfirst) 725 fprintf(rejfp, "--- 0%s\n", minuses); 726 else if (newlast == newfirst) 727 fprintf(rejfp, "--- %ld%s\n", newfirst, minuses); 728 else 729 fprintf(rejfp, "--- %ld,%ld%s\n", newfirst, 730 newlast, minuses); 731 break; 732 case '\n': 733 fprintf(rejfp, "%s", pfetch(i)); 734 break; 735 case ' ': 736 case '-': 737 case '+': 738 case '!': 739 fprintf(rejfp, "%c %s", pch_char(i), pfetch(i)); 740 break; 741 default: 742 fatal("fatal internal error in abort_context_hunk\n"); 743 } 744 } 745 } 746 747 static void 748 rej_line(int ch, LINENUM i) 749 { 750 size_t len; 751 const char *line = pfetch(i); 752 753 len = strlen(line); 754 755 fprintf(rejfp, "%c%s", ch, line); 756 if (len == 0 || line[len - 1] != '\n') { 757 if (len >= USHRT_MAX) 758 fprintf(rejfp, "\n\\ Line too long\n"); 759 else 760 fprintf(rejfp, "\n\\ No newline at end of line\n"); 761 } 762 } 763 764 static void 765 abort_hunk(void) 766 { 767 LINENUM i, j, split; 768 int ch1, ch2; 769 const LINENUM pat_end = pch_end(); 770 const LINENUM oldfirst = pch_first() + last_offset; 771 const LINENUM newfirst = pch_newfirst() + last_offset; 772 773 if (diff_type != UNI_DIFF) { 774 abort_context_hunk(); 775 return; 776 } 777 split = -1; 778 for (i = 0; i <= pat_end; i++) { 779 if (pch_char(i) == '=') { 780 split = i; 781 break; 782 } 783 } 784 if (split == -1) { 785 fprintf(rejfp, "malformed hunk: no split found\n"); 786 return; 787 } 788 i = 0; 789 j = split + 1; 790 fprintf(rejfp, "@@ -%ld,%ld +%ld,%ld @@\n", 791 pch_ptrn_lines() ? oldfirst : 0, 792 pch_ptrn_lines(), newfirst, pch_repl_lines()); 793 while (i < split || j <= pat_end) { 794 ch1 = i < split ? pch_char(i) : -1; 795 ch2 = j <= pat_end ? pch_char(j) : -1; 796 if (ch1 == '-') { 797 rej_line('-', i); 798 i++; 799 } else if (ch1 == ' ' && ch2 == ' ') { 800 rej_line(' ', i); 801 i++; 802 j++; 803 } else if (ch1 == '!' && ch2 == '!') { 804 while (i < split && ch1 == '!') { 805 rej_line('-', i); 806 i++; 807 ch1 = i < split ? pch_char(i) : -1; 808 } 809 while (j <= pat_end && ch2 == '!') { 810 rej_line('+', j); 811 j++; 812 ch2 = j <= pat_end ? pch_char(j) : -1; 813 } 814 } else if (ch1 == '*') { 815 i++; 816 } else if (ch2 == '+' || ch2 == ' ') { 817 rej_line(ch2, j); 818 j++; 819 } else { 820 fprintf(rejfp, "internal error on (%ld %ld %ld)\n", 821 i, split, j); 822 rej_line(ch1, i); 823 rej_line(ch2, j); 824 return; 825 } 826 } 827 } 828 829 /* We found where to apply it (we hope), so do it. */ 830 831 static void 832 apply_hunk(LINENUM where) 833 { 834 LINENUM old = 1; 835 const LINENUM lastline = pch_ptrn_lines(); 836 LINENUM new = lastline + 1; 837 #define OUTSIDE 0 838 #define IN_IFNDEF 1 839 #define IN_IFDEF 2 840 #define IN_ELSE 3 841 int def_state = OUTSIDE; 842 const LINENUM pat_end = pch_end(); 843 844 where--; 845 while (pch_char(new) == '=' || pch_char(new) == '\n') 846 new++; 847 848 while (old <= lastline) { 849 if (pch_char(old) == '-') { 850 copy_till(where + old - 1, false); 851 if (do_defines) { 852 if (def_state == OUTSIDE) { 853 fputs(not_defined, ofp); 854 def_state = IN_IFNDEF; 855 } else if (def_state == IN_IFDEF) { 856 fputs(else_defined, ofp); 857 def_state = IN_ELSE; 858 } 859 fputs(pfetch(old), ofp); 860 } 861 last_frozen_line++; 862 old++; 863 } else if (new > pat_end) { 864 break; 865 } else if (pch_char(new) == '+') { 866 copy_till(where + old - 1, false); 867 if (do_defines) { 868 if (def_state == IN_IFNDEF) { 869 fputs(else_defined, ofp); 870 def_state = IN_ELSE; 871 } else if (def_state == OUTSIDE) { 872 fputs(if_defined, ofp); 873 def_state = IN_IFDEF; 874 } 875 } 876 fputs(pfetch(new), ofp); 877 new++; 878 } else if (pch_char(new) != pch_char(old)) { 879 say("Out-of-sync patch, lines %ld,%ld--mangled text or line numbers, maybe?\n", 880 pch_hunk_beg() + old, 881 pch_hunk_beg() + new); 882 #ifdef DEBUGGING 883 say("oldchar = '%c', newchar = '%c'\n", 884 pch_char(old), pch_char(new)); 885 #endif 886 my_exit(2); 887 } else if (pch_char(new) == '!') { 888 copy_till(where + old - 1, false); 889 if (do_defines) { 890 fputs(not_defined, ofp); 891 def_state = IN_IFNDEF; 892 } 893 while (pch_char(old) == '!') { 894 if (do_defines) { 895 fputs(pfetch(old), ofp); 896 } 897 last_frozen_line++; 898 old++; 899 } 900 if (do_defines) { 901 fputs(else_defined, ofp); 902 def_state = IN_ELSE; 903 } 904 while (pch_char(new) == '!') { 905 fputs(pfetch(new), ofp); 906 new++; 907 } 908 } else { 909 if (pch_char(new) != ' ') 910 fatal("Internal error: expected ' '\n"); 911 old++; 912 new++; 913 if (do_defines && def_state != OUTSIDE) { 914 fputs(end_defined, ofp); 915 def_state = OUTSIDE; 916 } 917 } 918 } 919 if (new <= pat_end && pch_char(new) == '+') { 920 copy_till(where + old - 1, false); 921 if (do_defines) { 922 if (def_state == OUTSIDE) { 923 fputs(if_defined, ofp); 924 def_state = IN_IFDEF; 925 } else if (def_state == IN_IFNDEF) { 926 fputs(else_defined, ofp); 927 def_state = IN_ELSE; 928 } 929 } 930 while (new <= pat_end && pch_char(new) == '+') { 931 fputs(pfetch(new), ofp); 932 new++; 933 } 934 } 935 if (do_defines && def_state != OUTSIDE) { 936 fputs(end_defined, ofp); 937 } 938 } 939 940 /* 941 * Open the new file. 942 */ 943 static void 944 init_output(const char *name) 945 { 946 ofp = fopen(name, "w"); 947 if (ofp == NULL) 948 pfatal("can't create %s", name); 949 } 950 951 /* 952 * Open a file to put hunks we can't locate. 953 */ 954 static void 955 init_reject(const char *name) 956 { 957 rejfp = fopen(name, "w"); 958 if (rejfp == NULL) 959 pfatal("can't create %s", name); 960 } 961 962 /* 963 * Copy input file to output, up to wherever hunk is to be applied. 964 * If endoffile is true, treat the last line specially since it may 965 * lack a newline. 966 */ 967 static void 968 copy_till(LINENUM lastline, bool endoffile) 969 { 970 if (last_frozen_line > lastline) 971 fatal("misordered hunks! output would be garbled\n"); 972 while (last_frozen_line < lastline) { 973 if (++last_frozen_line == lastline && endoffile) 974 dump_line(last_frozen_line, !last_line_missing_eol); 975 else 976 dump_line(last_frozen_line, true); 977 } 978 } 979 980 /* 981 * Finish copying the input file to the output file. 982 */ 983 static bool 984 spew_output(void) 985 { 986 int rv; 987 988 #ifdef DEBUGGING 989 if (debug & 256) 990 say("il=%ld lfl=%ld\n", input_lines, last_frozen_line); 991 #endif 992 if (input_lines) 993 copy_till(input_lines, true); /* dump remainder of file */ 994 rv = ferror(ofp) == 0 && fclose(ofp) == 0; 995 ofp = NULL; 996 return rv; 997 } 998 999 /* 1000 * Copy one line from input to output. 1001 */ 1002 static void 1003 dump_line(LINENUM line, bool write_newline) 1004 { 1005 char *s; 1006 1007 s = ifetch(line, 0); 1008 if (s == NULL) 1009 return; 1010 /* Note: string is not NUL terminated. */ 1011 for (; *s != '\n'; s++) 1012 putc(*s, ofp); 1013 if (write_newline) 1014 putc('\n', ofp); 1015 } 1016 1017 /* 1018 * Does the patch pattern match at line base+offset? 1019 */ 1020 static bool 1021 patch_match(LINENUM base, LINENUM offset, LINENUM fuzz) 1022 { 1023 LINENUM pline = 1 + fuzz; 1024 LINENUM iline; 1025 LINENUM pat_lines = pch_ptrn_lines() - fuzz; 1026 const char *ilineptr; 1027 const char *plineptr; 1028 unsigned short plinelen; 1029 1030 /* Patch does not match if we don't have any more context to use */ 1031 if (pline > pat_lines) 1032 return false; 1033 for (iline = base + offset + fuzz; pline <= pat_lines; pline++, iline++) { 1034 ilineptr = ifetch(iline, offset >= 0); 1035 if (ilineptr == NULL) 1036 return false; 1037 plineptr = pfetch(pline); 1038 plinelen = pch_line_len(pline); 1039 if (canonicalize) { 1040 if (!similar(ilineptr, plineptr, plinelen)) 1041 return false; 1042 } else if (strnNE(ilineptr, plineptr, plinelen)) 1043 return false; 1044 if (iline == input_lines) { 1045 /* 1046 * We are looking at the last line of the file. 1047 * If the file has no eol, the patch line should 1048 * not have one either and vice-versa. Note that 1049 * plinelen > 0. 1050 */ 1051 if (last_line_missing_eol) { 1052 if (plineptr[plinelen - 1] == '\n') 1053 return false; 1054 } else { 1055 if (plineptr[plinelen - 1] != '\n') 1056 return false; 1057 } 1058 } 1059 } 1060 return true; 1061 } 1062 1063 /* 1064 * Do two lines match with canonicalized white space? 1065 */ 1066 static bool 1067 similar(const char *a, const char *b, int len) 1068 { 1069 while (len) { 1070 if (isspace((unsigned char)*b)) { /* whitespace (or \n) to match? */ 1071 if (!isspace((unsigned char)*a)) /* no corresponding whitespace? */ 1072 return false; 1073 while (len && isspace((unsigned char)*b) && *b != '\n') 1074 b++, len--; /* skip pattern whitespace */ 1075 while (isspace((unsigned char)*a) && *a != '\n') 1076 a++; /* skip target whitespace */ 1077 if (*a == '\n' || *b == '\n') 1078 return (*a == *b); /* should end in sync */ 1079 } else if (*a++ != *b++) /* match non-whitespace chars */ 1080 return false; 1081 else 1082 len--; /* probably not necessary */ 1083 } 1084 return true; /* actually, this is not reached */ 1085 /* since there is always a \n */ 1086 } 1087