1 /* $OpenBSD: patch.c,v 1.77 2024/08/30 07:11:02 op Exp $ */ 2 3 /* 4 * patch - a program to apply diffs to original files 5 * 6 * Copyright 1986, Larry Wall 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following condition is met: 10 * 1. Redistributions of source code must retain the above copyright notice, 11 * this condition and the following disclaimer. 12 * 13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY 14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 15 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 16 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR 17 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 19 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 20 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23 * SUCH DAMAGE. 24 * 25 * -C option added in 1998, original code by Marc Espie, based on FreeBSD 26 * behaviour 27 */ 28 29 #include <sys/types.h> 30 #include <sys/stat.h> 31 #include <unistd.h> 32 33 #include <ctype.h> 34 #include <getopt.h> 35 #include <libgen.h> 36 #include <limits.h> 37 #include <paths.h> 38 #include <stdio.h> 39 #include <string.h> 40 #include <stdlib.h> 41 42 #include "common.h" 43 #include "util.h" 44 #include "pch.h" 45 #include "inp.h" 46 #include "backupfile.h" 47 #include "ed.h" 48 49 mode_t filemode = 0644; 50 51 char *buf; /* general purpose buffer */ 52 size_t bufsz; /* general purpose buffer size */ 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 57 #define MAXFILEC 2 58 59 char *filearg[MAXFILEC]; 60 bool ok_to_create_file = false; 61 char *outname = NULL; 62 char *origprae = NULL; 63 char *TMPOUTNAME; 64 char *TMPINNAME; 65 char *TMPREJNAME; 66 char *TMPPATNAME; 67 bool toutkeep = false; 68 bool trejkeep = false; 69 bool warn_on_invalid_line; 70 bool last_line_missing_eol; 71 72 #ifdef DEBUGGING 73 int debug = 0; 74 #endif 75 76 bool force = false; 77 bool batch = false; 78 bool verbose = true; 79 bool reverse = false; 80 bool noreverse = false; 81 bool skip_rest_of_patch = false; 82 int strippath = 957; 83 bool canonicalize = false; 84 bool check_only = false; 85 int diff_type = 0; 86 char *revision = NULL; /* prerequisite revision, if any */ 87 LINENUM input_lines = 0; /* how long is input file in lines */ 88 int posix = 0; /* strict POSIX mode? */ 89 90 static void reinitialize_almost_everything(void); 91 static void get_some_switches(void); 92 static LINENUM locate_hunk(LINENUM); 93 static void abort_context_hunk(void); 94 static void rej_line(int, LINENUM); 95 static void abort_hunk(void); 96 static void apply_hunk(LINENUM); 97 static void init_output(const char *); 98 static void init_reject(const char *); 99 static void copy_till(LINENUM, bool); 100 static void spew_output(void); 101 static void dump_line(LINENUM, bool); 102 static bool patch_match(LINENUM, LINENUM, LINENUM); 103 static bool similar(const char *, const char *, ssize_t); 104 static __dead void usage(void); 105 106 /* true if -E was specified on command line. */ 107 static bool remove_empty_files = false; 108 109 /* true if -R was specified on command line. */ 110 static bool reverse_flag_specified = false; 111 112 static bool Vflag = false; 113 114 /* buffer holding the name of the rejected patch file. */ 115 static char rejname[PATH_MAX]; 116 117 /* how many input lines have been irretractibly output */ 118 static LINENUM last_frozen_line = 0; 119 120 static int Argc; /* guess */ 121 static char **Argv; 122 static int Argc_last; /* for restarting plan_b */ 123 static char **Argv_last; 124 125 static FILE *ofp = NULL; /* output file pointer */ 126 static FILE *rejfp = NULL; /* reject file pointer */ 127 128 static int filec = 0; /* how many file arguments? */ 129 static LINENUM last_offset = 0; 130 static LINENUM maxfuzz = 2; 131 132 /* patch using ifdef, ifndef, etc. */ 133 static bool do_defines = false; 134 /* #ifdef xyzzy */ 135 static char if_defined[128]; 136 /* #ifndef xyzzy */ 137 static char not_defined[128]; 138 /* #else */ 139 static const char else_defined[] = "#else\n"; 140 /* #endif xyzzy */ 141 static char end_defined[128]; 142 143 144 /* Apply a set of diffs as appropriate. */ 145 146 int 147 main(int argc, char *argv[]) 148 { 149 int error = 0, hunk, failed, i, fd; 150 bool patch_seen; 151 LINENUM where = 0, newwhere, fuzz, mymaxfuzz; 152 const char *tmpdir; 153 char *v; 154 155 if (pledge("stdio rpath wpath cpath tmppath fattr unveil", NULL) == -1) { 156 perror("pledge"); 157 my_exit(2); 158 } 159 160 bufsz = INITLINELEN; 161 if ((buf = malloc(bufsz)) == NULL) 162 pfatal("allocating input buffer"); 163 buf[0] = '\0'; 164 165 setvbuf(stdout, NULL, _IOLBF, 0); 166 setvbuf(stderr, NULL, _IOLBF, 0); 167 for (i = 0; i < MAXFILEC; i++) 168 filearg[i] = NULL; 169 170 /* Cons up the names of the temporary files. */ 171 if ((tmpdir = getenv("TMPDIR")) == NULL || *tmpdir == '\0') 172 tmpdir = _PATH_TMP; 173 for (i = strlen(tmpdir) - 1; i > 0 && tmpdir[i] == '/'; i--) 174 ; 175 i++; 176 if (asprintf(&TMPOUTNAME, "%.*s/patchoXXXXXXXXXX", i, tmpdir) == -1) 177 fatal("cannot allocate memory"); 178 if ((fd = mkstemp(TMPOUTNAME)) == -1) 179 pfatal("can't create %s", TMPOUTNAME); 180 close(fd); 181 182 if (asprintf(&TMPINNAME, "%.*s/patchiXXXXXXXXXX", i, tmpdir) == -1) 183 fatal("cannot allocate memory"); 184 if ((fd = mkstemp(TMPINNAME)) == -1) 185 pfatal("can't create %s", TMPINNAME); 186 close(fd); 187 188 if (asprintf(&TMPREJNAME, "%.*s/patchrXXXXXXXXXX", i, tmpdir) == -1) 189 fatal("cannot allocate memory"); 190 if ((fd = mkstemp(TMPREJNAME)) == -1) 191 pfatal("can't create %s", TMPREJNAME); 192 close(fd); 193 194 if (asprintf(&TMPPATNAME, "%.*s/patchpXXXXXXXXXX", i, tmpdir) == -1) 195 fatal("cannot allocate memory"); 196 if ((fd = mkstemp(TMPPATNAME)) == -1) 197 pfatal("can't create %s", TMPPATNAME); 198 close(fd); 199 200 v = getenv("SIMPLE_BACKUP_SUFFIX"); 201 if (v) 202 simple_backup_suffix = v; 203 else 204 simple_backup_suffix = ORIGEXT; 205 206 /* parse switches */ 207 Argc = argc; 208 Argv = argv; 209 get_some_switches(); 210 if (unveil(tmpdir, "rwc") == -1) { 211 perror("unveil"); 212 my_exit(2); 213 } 214 if (outname != NULL) 215 if (unveil(outname, "rwc") == -1) { 216 perror("unveil"); 217 my_exit(2); 218 } 219 if (filearg[0] != NULL) { 220 char *origdir; 221 222 if (unveil(filearg[0], "rwc") == -1) { 223 perror("unveil"); 224 my_exit(2); 225 } 226 if ((origdir = dirname(filearg[0])) == NULL) { 227 perror("dirname"); 228 my_exit(2); 229 } 230 if (unveil(origdir, "rwc") == -1) { 231 perror("unveil"); 232 my_exit(2); 233 } 234 } else { 235 if (unveil(".", "rwc") == -1) { 236 perror("unveil"); 237 my_exit(2); 238 } 239 } 240 if (filearg[1] != NULL) 241 if (unveil(filearg[1], "r") == -1) { 242 perror("unveil"); 243 my_exit(2); 244 } 245 if (!force && !batch) 246 if (unveil(_PATH_TTY, "r") == -1) { 247 perror("unveil"); 248 my_exit(2); 249 } 250 if (*rejname != '\0') 251 if (unveil(rejname, "rwc") == -1) { 252 perror("unveil"); 253 my_exit(2); 254 } 255 if (pledge("stdio rpath wpath cpath tmppath fattr", NULL) == -1) { 256 perror("pledge"); 257 my_exit(2); 258 } 259 260 if (!Vflag) { 261 if ((v = getenv("PATCH_VERSION_CONTROL")) == NULL) 262 v = getenv("VERSION_CONTROL"); 263 if (v != NULL || !posix) 264 backup_type = get_version(v); /* OK to pass NULL. */ 265 } 266 267 /* make sure we clean up /tmp in case of disaster */ 268 set_signals(0); 269 270 patch_seen = false; 271 for (open_patch_file(filearg[1]); there_is_another_patch(); 272 reinitialize_almost_everything()) { 273 /* for each patch in patch file */ 274 275 patch_seen = true; 276 277 warn_on_invalid_line = true; 278 279 if (outname == NULL) 280 outname = xstrdup(filearg[0]); 281 282 /* initialize the patched file */ 283 if (!skip_rest_of_patch) 284 init_output(TMPOUTNAME); 285 286 /* initialize reject file */ 287 init_reject(TMPREJNAME); 288 289 /* find out where all the lines are */ 290 if (!skip_rest_of_patch) 291 scan_input(filearg[0]); 292 293 /* for ed script just up and do it and exit */ 294 if (diff_type == ED_DIFF) { 295 do_ed_script(); 296 continue; 297 } 298 299 /* from here on, open no standard i/o files, because malloc */ 300 /* might misfire and we can't catch it easily */ 301 302 /* apply each hunk of patch */ 303 hunk = 0; 304 failed = 0; 305 out_of_mem = false; 306 while (another_hunk()) { 307 hunk++; 308 fuzz = 0; 309 mymaxfuzz = pch_context(); 310 if (maxfuzz < mymaxfuzz) 311 mymaxfuzz = maxfuzz; 312 if (!skip_rest_of_patch) { 313 do { 314 where = locate_hunk(fuzz); 315 if ((hunk == 1 && where == 0 && !force) || 316 (where == 1 && pch_ptrn_lines() == 0 && !force)) { 317 /* dwim for reversed patch? */ 318 if (!pch_swap()) { 319 if (fuzz == 0) 320 say("Not enough memory to try swapped hunk! Assuming unswapped.\n"); 321 continue; 322 } 323 reverse = !reverse; 324 /* try again */ 325 where = locate_hunk(fuzz); 326 if (where == 0) { 327 /* didn't find it swapped */ 328 if (!pch_swap()) 329 /* put it back to normal */ 330 fatal("lost hunk on alloc error!\n"); 331 reverse = !reverse; 332 333 /* restore position if this patch creates a file */ 334 if (pch_ptrn_lines() == 0) 335 where = 1; 336 } else if (noreverse) { 337 if (!pch_swap()) 338 /* put it back to normal */ 339 fatal("lost hunk on alloc error!\n"); 340 reverse = !reverse; 341 say("Ignoring previously applied (or reversed) patch.\n"); 342 skip_rest_of_patch = true; 343 } else if (batch) { 344 if (verbose) 345 say("%seversed (or previously applied) patch detected! %s -R.", 346 reverse ? "R" : "Unr", 347 reverse ? "Assuming" : "Ignoring"); 348 } else { 349 ask("%seversed (or previously applied) patch detected! %s -R? [y] ", 350 reverse ? "R" : "Unr", 351 reverse ? "Assume" : "Ignore"); 352 if (*buf == 'n') { 353 ask("Apply anyway? [n] "); 354 if (*buf != 'y') 355 skip_rest_of_patch = true; 356 where = 0; 357 reverse = !reverse; 358 if (!pch_swap()) 359 /* put it back to normal */ 360 fatal("lost hunk on alloc error!\n"); 361 } 362 } 363 } 364 } while (!skip_rest_of_patch && where == 0 && 365 ++fuzz <= mymaxfuzz); 366 367 if (skip_rest_of_patch) { /* just got decided */ 368 fclose(ofp); 369 ofp = NULL; 370 } 371 } 372 newwhere = pch_newfirst() + last_offset; 373 if (skip_rest_of_patch) { 374 abort_hunk(); 375 failed++; 376 if (verbose) 377 say("Hunk #%d ignored at %ld.\n", 378 hunk, newwhere); 379 } else if (where == 0) { 380 abort_hunk(); 381 failed++; 382 if (verbose) 383 say("Hunk #%d failed at %ld.\n", 384 hunk, newwhere); 385 } else { 386 apply_hunk(where); 387 if (verbose) { 388 say("Hunk #%d succeeded at %ld", 389 hunk, newwhere); 390 if (fuzz != 0) 391 say(" with fuzz %ld", fuzz); 392 if (last_offset) 393 say(" (offset %ld line%s)", 394 last_offset, 395 last_offset == 1L ? "" : "s"); 396 say(".\n"); 397 } 398 } 399 } 400 401 if (out_of_mem && using_plan_a) { 402 Argc = Argc_last; 403 Argv = Argv_last; 404 say("\n\nRan out of memory using Plan A--trying again...\n\n"); 405 if (ofp) 406 fclose(ofp); 407 ofp = NULL; 408 if (rejfp) 409 fclose(rejfp); 410 rejfp = NULL; 411 continue; 412 } 413 if (hunk == 0) 414 fatal("Internal error: hunk should not be 0\n"); 415 416 /* finish spewing out the new file */ 417 if (!skip_rest_of_patch) 418 spew_output(); 419 420 /* and put the output where desired */ 421 ignore_signals(); 422 if (!skip_rest_of_patch) { 423 struct stat statbuf; 424 char *realout = outname; 425 426 if (!check_only) { 427 if (move_file(TMPOUTNAME, outname) < 0) { 428 toutkeep = true; 429 realout = TMPOUTNAME; 430 chmod(TMPOUTNAME, filemode); 431 } else 432 chmod(outname, filemode); 433 434 if (remove_empty_files && 435 stat(realout, &statbuf) == 0 && 436 statbuf.st_size == 0) { 437 if (verbose) 438 say("Removing %s (empty after patching).\n", 439 realout); 440 unlink(realout); 441 } 442 } 443 } 444 fclose(rejfp); 445 rejfp = NULL; 446 if (failed) { 447 error = 1; 448 if (*rejname == '\0') { 449 if (strlcpy(rejname, outname, 450 sizeof(rejname)) >= sizeof(rejname)) 451 fatal("filename %s is too long\n", outname); 452 if (strlcat(rejname, REJEXT, 453 sizeof(rejname)) >= sizeof(rejname)) 454 fatal("filename %s is too long\n", outname); 455 } 456 if (!check_only) 457 say("%d out of %d hunks %s--saving rejects to %s\n", 458 failed, hunk, skip_rest_of_patch ? "ignored" : "failed", rejname); 459 else 460 say("%d out of %d hunks %s\n", 461 failed, hunk, skip_rest_of_patch ? "ignored" : "failed"); 462 if (!check_only && move_file(TMPREJNAME, rejname) < 0) 463 trejkeep = true; 464 } 465 set_signals(1); 466 } 467 468 if (!patch_seen) 469 error = 2; 470 471 my_exit(error); 472 /* NOTREACHED */ 473 } 474 475 /* Prepare to find the next patch to do in the patch file. */ 476 477 static void 478 reinitialize_almost_everything(void) 479 { 480 re_patch(); 481 re_input(); 482 483 input_lines = 0; 484 last_frozen_line = 0; 485 486 filec = 0; 487 if (!out_of_mem) { 488 free(filearg[0]); 489 filearg[0] = NULL; 490 } 491 492 free(outname); 493 outname = NULL; 494 495 last_offset = 0; 496 diff_type = 0; 497 498 free(revision); 499 revision = NULL; 500 501 reverse = reverse_flag_specified; 502 skip_rest_of_patch = false; 503 504 get_some_switches(); 505 } 506 507 /* Process switches and filenames. */ 508 509 static void 510 get_some_switches(void) 511 { 512 const char *options = "b::B:cCd:D:eEfF:i:lnNo:p:r:RstuvV:x:z:"; 513 static struct option longopts[] = { 514 {"backup", no_argument, 0, 'b'}, 515 {"batch", no_argument, 0, 't'}, 516 {"check", no_argument, 0, 'C'}, 517 {"context", no_argument, 0, 'c'}, 518 {"debug", required_argument, 0, 'x'}, 519 {"directory", required_argument, 0, 'd'}, 520 {"dry-run", no_argument, 0, 'C'}, 521 {"ed", no_argument, 0, 'e'}, 522 {"force", no_argument, 0, 'f'}, 523 {"forward", no_argument, 0, 'N'}, 524 {"fuzz", required_argument, 0, 'F'}, 525 {"ifdef", required_argument, 0, 'D'}, 526 {"input", required_argument, 0, 'i'}, 527 {"ignore-whitespace", no_argument, 0, 'l'}, 528 {"normal", no_argument, 0, 'n'}, 529 {"output", required_argument, 0, 'o'}, 530 {"prefix", required_argument, 0, 'B'}, 531 {"quiet", no_argument, 0, 's'}, 532 {"reject-file", required_argument, 0, 'r'}, 533 {"remove-empty-files", no_argument, 0, 'E'}, 534 {"reverse", no_argument, 0, 'R'}, 535 {"silent", no_argument, 0, 's'}, 536 {"strip", required_argument, 0, 'p'}, 537 {"suffix", required_argument, 0, 'z'}, 538 {"unified", no_argument, 0, 'u'}, 539 {"version", no_argument, 0, 'v'}, 540 {"version-control", required_argument, 0, 'V'}, 541 {"posix", no_argument, &posix, 1}, 542 {NULL, 0, 0, 0} 543 }; 544 int ch; 545 const char *errstr; 546 547 rejname[0] = '\0'; 548 Argc_last = Argc; 549 Argv_last = Argv; 550 if (!Argc) 551 return; 552 optreset = optind = 1; 553 while ((ch = getopt_long(Argc, Argv, options, longopts, NULL)) != -1) { 554 switch (ch) { 555 case 'b': 556 if (backup_type == none) 557 backup_type = numbered_existing; 558 if (optarg == NULL) 559 break; 560 if (verbose) 561 say("Warning, the ``-b suffix'' option has been" 562 " obsoleted by the -z option.\n"); 563 /* FALLTHROUGH */ 564 case 'z': 565 /* must directly follow 'b' case for backwards compat */ 566 simple_backup_suffix = xstrdup(optarg); 567 break; 568 case 'B': 569 origprae = xstrdup(optarg); 570 break; 571 case 'c': 572 diff_type = CONTEXT_DIFF; 573 break; 574 case 'C': 575 check_only = true; 576 break; 577 case 'd': 578 if (chdir(optarg) == -1) 579 pfatal("can't cd to %s", optarg); 580 break; 581 case 'D': 582 do_defines = true; 583 if (!isalpha((unsigned char)*optarg) && *optarg != '_') 584 fatal("argument to -D is not an identifier\n"); 585 snprintf(if_defined, sizeof if_defined, 586 "#ifdef %s\n", optarg); 587 snprintf(not_defined, sizeof not_defined, 588 "#ifndef %s\n", optarg); 589 snprintf(end_defined, sizeof end_defined, 590 "#endif /* %s */\n", optarg); 591 break; 592 case 'e': 593 diff_type = ED_DIFF; 594 break; 595 case 'E': 596 remove_empty_files = true; 597 break; 598 case 'f': 599 force = true; 600 break; 601 case 'F': 602 maxfuzz = strtonum(optarg, 0, INT_MAX, &errstr); 603 if (errstr != NULL) 604 fatal("maximum fuzz is %s: %s\n", 605 errstr, optarg); 606 break; 607 case 'i': 608 if (++filec == MAXFILEC) 609 fatal("too many file arguments\n"); 610 filearg[filec] = xstrdup(optarg); 611 break; 612 case 'l': 613 canonicalize = true; 614 break; 615 case 'n': 616 diff_type = NORMAL_DIFF; 617 break; 618 case 'N': 619 noreverse = true; 620 break; 621 case 'o': 622 outname = xstrdup(optarg); 623 break; 624 case 'p': 625 strippath = strtonum(optarg, 0, INT_MAX, &errstr); 626 if (errstr != NULL) 627 fatal("strip count is %s: %s\n", 628 errstr, optarg); 629 break; 630 case 'r': 631 if (strlcpy(rejname, optarg, 632 sizeof(rejname)) >= sizeof(rejname)) 633 fatal("argument for -r is too long\n"); 634 break; 635 case 'R': 636 reverse = true; 637 reverse_flag_specified = true; 638 break; 639 case 's': 640 verbose = false; 641 break; 642 case 't': 643 batch = true; 644 break; 645 case 'u': 646 diff_type = UNI_DIFF; 647 break; 648 case 'v': 649 version(); 650 break; 651 case 'V': 652 backup_type = get_version(optarg); 653 Vflag = true; 654 break; 655 #ifdef DEBUGGING 656 case 'x': 657 debug = strtonum(optarg, 0, INT_MAX, &errstr); 658 if (errstr != NULL) 659 fatal("debug number is %s: %s\n", 660 errstr, optarg); 661 break; 662 #endif 663 default: 664 if (ch != '\0') 665 usage(); 666 break; 667 } 668 } 669 Argc -= optind; 670 Argv += optind; 671 672 if (Argc > 0) { 673 filearg[0] = xstrdup(*Argv++); 674 Argc--; 675 while (Argc > 0) { 676 if (++filec == MAXFILEC) 677 fatal("too many file arguments\n"); 678 filearg[filec] = xstrdup(*Argv++); 679 Argc--; 680 } 681 } 682 683 if (getenv("POSIXLY_CORRECT") != NULL) 684 posix = 1; 685 } 686 687 static __dead void 688 usage(void) 689 { 690 fprintf(stderr, 691 "usage: patch [-bCcEeflNnRstuv] [-B backup-prefix] [-D symbol] [-d directory]\n" 692 " [-F max-fuzz] [-i patchfile] [-o out-file] [-p strip-count]\n" 693 " [-r rej-name] [-V t | nil | never | none] [-x number]\n" 694 " [-z backup-ext] [--posix] [origfile [patchfile]]\n" 695 " patch <patchfile\n"); 696 my_exit(2); 697 } 698 699 /* 700 * Attempt to find the right place to apply this hunk of patch. 701 */ 702 static LINENUM 703 locate_hunk(LINENUM fuzz) 704 { 705 LINENUM first_guess = pch_first() + last_offset; 706 LINENUM offset; 707 LINENUM pat_lines = pch_ptrn_lines(); 708 LINENUM max_pos_offset = input_lines - first_guess - pat_lines + 1; 709 LINENUM max_neg_offset = first_guess - last_frozen_line - 1 + pch_context(); 710 711 if (pat_lines == 0) { /* null range matches always */ 712 if (verbose && fuzz == 0 && (diff_type == CONTEXT_DIFF 713 || diff_type == NEW_CONTEXT_DIFF 714 || diff_type == UNI_DIFF)) { 715 say("Empty context always matches.\n"); 716 } 717 if (first_guess == 0) 718 return 1; 719 return (first_guess); 720 } 721 if (max_neg_offset >= first_guess) /* do not try lines < 0 */ 722 max_neg_offset = first_guess - 1; 723 if (first_guess <= input_lines && patch_match(first_guess, 0, fuzz)) 724 return first_guess; 725 for (offset = 1; ; offset++) { 726 bool check_after = (offset <= max_pos_offset); 727 bool check_before = (offset <= max_neg_offset); 728 729 if (check_after && patch_match(first_guess, offset, fuzz)) { 730 #ifdef DEBUGGING 731 if (debug & 1) 732 say("Offset changing from %ld to %ld\n", 733 last_offset, offset); 734 #endif 735 last_offset = offset; 736 return first_guess + offset; 737 } else if (check_before && patch_match(first_guess, -offset, fuzz)) { 738 #ifdef DEBUGGING 739 if (debug & 1) 740 say("Offset changing from %ld to %ld\n", 741 last_offset, -offset); 742 #endif 743 last_offset = -offset; 744 return first_guess - offset; 745 } else if (!check_before && !check_after) 746 return 0; 747 } 748 } 749 750 /* We did not find the pattern, dump out the hunk so they can handle it. */ 751 752 static void 753 abort_context_hunk(void) 754 { 755 LINENUM i; 756 const LINENUM pat_end = pch_end(); 757 /* 758 * add in last_offset to guess the same as the previous successful 759 * hunk 760 */ 761 const LINENUM oldfirst = pch_first() + last_offset; 762 const LINENUM newfirst = pch_newfirst() + last_offset; 763 const LINENUM oldlast = oldfirst + pch_ptrn_lines() - 1; 764 const LINENUM newlast = newfirst + pch_repl_lines() - 1; 765 const char *stars = (diff_type >= NEW_CONTEXT_DIFF ? " ****" : ""); 766 const char *minuses = (diff_type >= NEW_CONTEXT_DIFF ? " ----" : " -----"); 767 768 fprintf(rejfp, "***************\n"); 769 for (i = 0; i <= pat_end; i++) { 770 switch (pch_char(i)) { 771 case '*': 772 if (oldlast < oldfirst) 773 fprintf(rejfp, "*** 0%s\n", stars); 774 else if (oldlast == oldfirst) 775 fprintf(rejfp, "*** %ld%s\n", oldfirst, stars); 776 else 777 fprintf(rejfp, "*** %ld,%ld%s\n", oldfirst, 778 oldlast, stars); 779 break; 780 case '=': 781 if (newlast < newfirst) 782 fprintf(rejfp, "--- 0%s\n", minuses); 783 else if (newlast == newfirst) 784 fprintf(rejfp, "--- %ld%s\n", newfirst, minuses); 785 else 786 fprintf(rejfp, "--- %ld,%ld%s\n", newfirst, 787 newlast, minuses); 788 break; 789 case '\n': 790 fprintf(rejfp, "%s", pfetch(i)); 791 break; 792 case ' ': 793 case '-': 794 case '+': 795 case '!': 796 fprintf(rejfp, "%c %s", pch_char(i), pfetch(i)); 797 break; 798 default: 799 fatal("fatal internal error in abort_context_hunk\n"); 800 } 801 } 802 } 803 804 static void 805 rej_line(int ch, LINENUM i) 806 { 807 size_t len; 808 const char *line = pfetch(i); 809 810 len = strlen(line); 811 812 fprintf(rejfp, "%c%s", ch, line); 813 if (len == 0 || line[len-1] != '\n') 814 fprintf(rejfp, "\n\\ No newline at end of file\n"); 815 } 816 817 static void 818 abort_hunk(void) 819 { 820 LINENUM i, j, split; 821 int ch1, ch2; 822 const LINENUM pat_end = pch_end(); 823 const LINENUM oldfirst = pch_first() + last_offset; 824 const LINENUM newfirst = pch_newfirst() + last_offset; 825 826 if (diff_type != UNI_DIFF) { 827 abort_context_hunk(); 828 return; 829 } 830 split = -1; 831 for (i = 0; i <= pat_end; i++) { 832 if (pch_char(i) == '=') { 833 split = i; 834 break; 835 } 836 } 837 if (split == -1) { 838 fprintf(rejfp, "malformed hunk: no split found\n"); 839 return; 840 } 841 i = 0; 842 j = split + 1; 843 fprintf(rejfp, "@@ -%ld,%ld +%ld,%ld @@\n", 844 pch_ptrn_lines() ? oldfirst : 0, 845 pch_ptrn_lines(), newfirst, pch_repl_lines()); 846 while (i < split || j <= pat_end) { 847 ch1 = i < split ? pch_char(i) : -1; 848 ch2 = j <= pat_end ? pch_char(j) : -1; 849 if (ch1 == '-') { 850 rej_line('-', i); 851 i++; 852 } else if (ch1 == ' ' && ch2 == ' ') { 853 rej_line(' ', i); 854 i++; 855 j++; 856 } else if (ch1 == '!' && ch2 == '!') { 857 while (i < split && ch1 == '!') { 858 rej_line('-', i); 859 i++; 860 ch1 = i < split ? pch_char(i) : -1; 861 } 862 while (j <= pat_end && ch2 == '!') { 863 rej_line('+', j); 864 j++; 865 ch2 = j <= pat_end ? pch_char(j) : -1; 866 } 867 } else if (ch1 == '*') { 868 i++; 869 } else if (ch2 == '+' || ch2 == ' ') { 870 rej_line(ch2, j); 871 j++; 872 } else { 873 fprintf(rejfp, "internal error on (%ld %ld %ld)\n", 874 i, split, j); 875 rej_line(ch1, i); 876 rej_line(ch2, j); 877 return; 878 } 879 } 880 } 881 882 /* We found where to apply it (we hope), so do it. */ 883 884 static void 885 apply_hunk(LINENUM where) 886 { 887 LINENUM old = 1; 888 const LINENUM lastline = pch_ptrn_lines(); 889 LINENUM new = lastline + 1; 890 #define OUTSIDE 0 891 #define IN_IFNDEF 1 892 #define IN_IFDEF 2 893 #define IN_ELSE 3 894 int def_state = OUTSIDE; 895 const LINENUM pat_end = pch_end(); 896 897 where--; 898 while (pch_char(new) == '=' || pch_char(new) == '\n') 899 new++; 900 901 while (old <= lastline) { 902 if (pch_char(old) == '-') { 903 copy_till(where + old - 1, false); 904 if (do_defines) { 905 if (def_state == OUTSIDE) { 906 fputs(not_defined, ofp); 907 def_state = IN_IFNDEF; 908 } else if (def_state == IN_IFDEF) { 909 fputs(else_defined, ofp); 910 def_state = IN_ELSE; 911 } 912 fputs(pfetch(old), ofp); 913 } 914 last_frozen_line++; 915 old++; 916 } else if (new > pat_end) { 917 break; 918 } else if (pch_char(new) == '+') { 919 copy_till(where + old - 1, false); 920 if (do_defines) { 921 if (def_state == IN_IFNDEF) { 922 fputs(else_defined, ofp); 923 def_state = IN_ELSE; 924 } else if (def_state == OUTSIDE) { 925 fputs(if_defined, ofp); 926 def_state = IN_IFDEF; 927 } 928 } 929 fputs(pfetch(new), ofp); 930 new++; 931 } else if (pch_char(new) != pch_char(old)) { 932 say("Out-of-sync patch, lines %ld,%ld--mangled text or line numbers, maybe?\n", 933 pch_hunk_beg() + old, 934 pch_hunk_beg() + new); 935 #ifdef DEBUGGING 936 say("oldchar = '%c', newchar = '%c'\n", 937 pch_char(old), pch_char(new)); 938 #endif 939 my_exit(2); 940 } else if (pch_char(new) == '!') { 941 copy_till(where + old - 1, false); 942 if (do_defines) { 943 fputs(not_defined, ofp); 944 def_state = IN_IFNDEF; 945 } 946 while (pch_char(old) == '!') { 947 if (do_defines) { 948 fputs(pfetch(old), ofp); 949 } 950 last_frozen_line++; 951 old++; 952 } 953 if (do_defines) { 954 fputs(else_defined, ofp); 955 def_state = IN_ELSE; 956 } 957 while (pch_char(new) == '!') { 958 fputs(pfetch(new), ofp); 959 new++; 960 } 961 } else { 962 if (pch_char(new) != ' ') 963 fatal("Internal error: expected ' '\n"); 964 old++; 965 new++; 966 if (do_defines && def_state != OUTSIDE) { 967 fputs(end_defined, ofp); 968 def_state = OUTSIDE; 969 } 970 } 971 } 972 if (new <= pat_end && pch_char(new) == '+') { 973 copy_till(where + old - 1, false); 974 if (do_defines) { 975 if (def_state == OUTSIDE) { 976 fputs(if_defined, ofp); 977 def_state = IN_IFDEF; 978 } else if (def_state == IN_IFNDEF) { 979 fputs(else_defined, ofp); 980 def_state = IN_ELSE; 981 } 982 } 983 while (new <= pat_end && pch_char(new) == '+') { 984 fputs(pfetch(new), ofp); 985 new++; 986 } 987 } 988 if (do_defines && def_state != OUTSIDE) { 989 fputs(end_defined, ofp); 990 } 991 } 992 993 /* 994 * Open the new file. 995 */ 996 static void 997 init_output(const char *name) 998 { 999 ofp = fopen(name, "w"); 1000 if (ofp == NULL) 1001 pfatal("can't create %s", name); 1002 } 1003 1004 /* 1005 * Open a file to put hunks we can't locate. 1006 */ 1007 static void 1008 init_reject(const char *name) 1009 { 1010 rejfp = fopen(name, "w"); 1011 if (rejfp == NULL) 1012 pfatal("can't create %s", name); 1013 } 1014 1015 /* 1016 * Copy input file to output, up to wherever hunk is to be applied. 1017 * If endoffile is true, treat the last line specially since it may 1018 * lack a newline. 1019 */ 1020 static void 1021 copy_till(LINENUM lastline, bool endoffile) 1022 { 1023 if (last_frozen_line > lastline) 1024 fatal("misordered hunks! output would be garbled\n"); 1025 while (last_frozen_line < lastline) { 1026 if (++last_frozen_line == lastline && endoffile) 1027 dump_line(last_frozen_line, !last_line_missing_eol); 1028 else 1029 dump_line(last_frozen_line, true); 1030 } 1031 } 1032 1033 /* 1034 * Finish copying the input file to the output file. 1035 */ 1036 static void 1037 spew_output(void) 1038 { 1039 #ifdef DEBUGGING 1040 if (debug & 256) 1041 say("il=%ld lfl=%ld\n", input_lines, last_frozen_line); 1042 #endif 1043 if (input_lines) 1044 copy_till(input_lines, true); /* dump remainder of file */ 1045 fclose(ofp); 1046 ofp = NULL; 1047 } 1048 1049 /* 1050 * Copy one line from input to output. 1051 */ 1052 static void 1053 dump_line(LINENUM line, bool write_newline) 1054 { 1055 char *s; 1056 1057 s = ifetch(line, 0); 1058 if (s == NULL) 1059 return; 1060 /* Note: string is not NUL terminated. */ 1061 for (; *s != '\n'; s++) 1062 putc(*s, ofp); 1063 if (write_newline) 1064 putc('\n', ofp); 1065 } 1066 1067 /* 1068 * Does the patch pattern match at line base+offset? 1069 */ 1070 static bool 1071 patch_match(LINENUM base, LINENUM offset, LINENUM fuzz) 1072 { 1073 LINENUM pline = 1 + fuzz; 1074 LINENUM iline; 1075 LINENUM pat_lines = pch_ptrn_lines() - fuzz; 1076 const char *ilineptr; 1077 const char *plineptr; 1078 ssize_t plinelen; 1079 1080 for (iline = base + offset + fuzz; pline <= pat_lines; pline++, iline++) { 1081 ilineptr = ifetch(iline, offset >= 0); 1082 if (ilineptr == NULL) 1083 return false; 1084 plineptr = pfetch(pline); 1085 plinelen = pch_line_len(pline); 1086 if (canonicalize) { 1087 if (!similar(ilineptr, plineptr, plinelen)) 1088 return false; 1089 } else if (strnNE(ilineptr, plineptr, plinelen)) 1090 return false; 1091 if (iline == input_lines) { 1092 /* 1093 * We are looking at the last line of the file. 1094 * If the file has no eol, the patch line should 1095 * not have one either and vice-versa. Note that 1096 * plinelen > 0. 1097 */ 1098 if (last_line_missing_eol) { 1099 if (plineptr[plinelen - 1] == '\n') 1100 return false; 1101 } else { 1102 if (plineptr[plinelen - 1] != '\n') 1103 return false; 1104 } 1105 } 1106 } 1107 return true; 1108 } 1109 1110 /* 1111 * Do two lines match with canonicalized white space? 1112 */ 1113 static bool 1114 similar(const char *a, const char *b, ssize_t len) 1115 { 1116 while (len) { 1117 if (isspace((unsigned char)*b)) { /* whitespace (or \n) to match? */ 1118 if (!isspace((unsigned char)*a)) 1119 return false; /* no corresponding whitespace */ 1120 while (len && isspace((unsigned char)*b) && *b != '\n') 1121 b++, len--; /* skip pattern whitespace */ 1122 while (isspace((unsigned char)*a) && *a != '\n') 1123 a++; /* skip target whitespace */ 1124 if (*a == '\n' || *b == '\n') 1125 return (*a == *b); /* should end in sync */ 1126 } else if (*a++ != *b++) /* match non-whitespace chars */ 1127 return false; 1128 else 1129 len--; /* probably not necessary */ 1130 } 1131 return true; /* actually, this is not reached */ 1132 /* since there is always a \n */ 1133 } 1134