1 /* $OpenBSD: patch.c,v 1.75 2023/10/25 20:05:43 bluhm 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 /* buffer holding the name of the rejected patch file. */ 113 static char rejname[PATH_MAX]; 114 115 /* how many input lines have been irretractibly output */ 116 static LINENUM last_frozen_line = 0; 117 118 static int Argc; /* guess */ 119 static char **Argv; 120 static int Argc_last; /* for restarting plan_b */ 121 static char **Argv_last; 122 123 static FILE *ofp = NULL; /* output file pointer */ 124 static FILE *rejfp = NULL; /* reject file pointer */ 125 126 static int filec = 0; /* how many file arguments? */ 127 static LINENUM last_offset = 0; 128 static LINENUM maxfuzz = 2; 129 130 /* patch using ifdef, ifndef, etc. */ 131 static bool do_defines = false; 132 /* #ifdef xyzzy */ 133 static char if_defined[128]; 134 /* #ifndef xyzzy */ 135 static char not_defined[128]; 136 /* #else */ 137 static const char else_defined[] = "#else\n"; 138 /* #endif xyzzy */ 139 static char end_defined[128]; 140 141 142 /* Apply a set of diffs as appropriate. */ 143 144 int 145 main(int argc, char *argv[]) 146 { 147 int error = 0, hunk, failed, i, fd; 148 bool patch_seen; 149 LINENUM where = 0, newwhere, fuzz, mymaxfuzz; 150 const char *tmpdir; 151 char *v; 152 153 if (pledge("stdio rpath wpath cpath tmppath fattr unveil", NULL) == -1) { 154 perror("pledge"); 155 my_exit(2); 156 } 157 158 bufsz = INITLINELEN; 159 if ((buf = malloc(bufsz)) == NULL) 160 pfatal("allocating input buffer"); 161 buf[0] = '\0'; 162 163 setvbuf(stdout, NULL, _IOLBF, 0); 164 setvbuf(stderr, NULL, _IOLBF, 0); 165 for (i = 0; i < MAXFILEC; i++) 166 filearg[i] = NULL; 167 168 /* Cons up the names of the temporary files. */ 169 if ((tmpdir = getenv("TMPDIR")) == NULL || *tmpdir == '\0') 170 tmpdir = _PATH_TMP; 171 for (i = strlen(tmpdir) - 1; i > 0 && tmpdir[i] == '/'; i--) 172 ; 173 i++; 174 if (asprintf(&TMPOUTNAME, "%.*s/patchoXXXXXXXXXX", i, tmpdir) == -1) 175 fatal("cannot allocate memory"); 176 if ((fd = mkstemp(TMPOUTNAME)) == -1) 177 pfatal("can't create %s", TMPOUTNAME); 178 close(fd); 179 180 if (asprintf(&TMPINNAME, "%.*s/patchiXXXXXXXXXX", i, tmpdir) == -1) 181 fatal("cannot allocate memory"); 182 if ((fd = mkstemp(TMPINNAME)) == -1) 183 pfatal("can't create %s", TMPINNAME); 184 close(fd); 185 186 if (asprintf(&TMPREJNAME, "%.*s/patchrXXXXXXXXXX", i, tmpdir) == -1) 187 fatal("cannot allocate memory"); 188 if ((fd = mkstemp(TMPREJNAME)) == -1) 189 pfatal("can't create %s", TMPREJNAME); 190 close(fd); 191 192 if (asprintf(&TMPPATNAME, "%.*s/patchpXXXXXXXXXX", i, tmpdir) == -1) 193 fatal("cannot allocate memory"); 194 if ((fd = mkstemp(TMPPATNAME)) == -1) 195 pfatal("can't create %s", TMPPATNAME); 196 close(fd); 197 198 v = getenv("SIMPLE_BACKUP_SUFFIX"); 199 if (v) 200 simple_backup_suffix = v; 201 else 202 simple_backup_suffix = ORIGEXT; 203 204 /* parse switches */ 205 Argc = argc; 206 Argv = argv; 207 get_some_switches(); 208 if (unveil(tmpdir, "rwc") == -1) { 209 perror("unveil"); 210 my_exit(2); 211 } 212 if (outname != NULL) 213 if (unveil(outname, "rwc") == -1) { 214 perror("unveil"); 215 my_exit(2); 216 } 217 if (filearg[0] != NULL) { 218 char *origdir; 219 220 if (unveil(filearg[0], "rwc") == -1) { 221 perror("unveil"); 222 my_exit(2); 223 } 224 if ((origdir = dirname(filearg[0])) == NULL) { 225 perror("dirname"); 226 my_exit(2); 227 } 228 if (unveil(origdir, "rwc") == -1) { 229 perror("unveil"); 230 my_exit(2); 231 } 232 } else { 233 if (unveil(".", "rwc") == -1) { 234 perror("unveil"); 235 my_exit(2); 236 } 237 } 238 if (filearg[1] != NULL) 239 if (unveil(filearg[1], "r") == -1) { 240 perror("unveil"); 241 my_exit(2); 242 } 243 if (!force && !batch) 244 if (unveil(_PATH_TTY, "r") == -1) { 245 perror("unveil"); 246 my_exit(2); 247 } 248 if (*rejname != '\0') 249 if (unveil(rejname, "rwc") == -1) { 250 perror("unveil"); 251 my_exit(2); 252 } 253 if (pledge("stdio rpath wpath cpath tmppath fattr", NULL) == -1) { 254 perror("pledge"); 255 my_exit(2); 256 } 257 258 if (backup_type == none) { 259 if ((v = getenv("PATCH_VERSION_CONTROL")) == NULL) 260 v = getenv("VERSION_CONTROL"); 261 if (v != NULL || !posix) 262 backup_type = get_version(v); /* OK to pass NULL. */ 263 } 264 265 /* make sure we clean up /tmp in case of disaster */ 266 set_signals(0); 267 268 patch_seen = false; 269 for (open_patch_file(filearg[1]); there_is_another_patch(); 270 reinitialize_almost_everything()) { 271 /* for each patch in patch file */ 272 273 patch_seen = true; 274 275 warn_on_invalid_line = true; 276 277 if (outname == NULL) 278 outname = xstrdup(filearg[0]); 279 280 /* initialize the patched file */ 281 if (!skip_rest_of_patch) 282 init_output(TMPOUTNAME); 283 284 /* initialize reject file */ 285 init_reject(TMPREJNAME); 286 287 /* find out where all the lines are */ 288 if (!skip_rest_of_patch) 289 scan_input(filearg[0]); 290 291 /* for ed script just up and do it and exit */ 292 if (diff_type == ED_DIFF) { 293 do_ed_script(); 294 continue; 295 } 296 297 /* from here on, open no standard i/o files, because malloc */ 298 /* might misfire and we can't catch it easily */ 299 300 /* apply each hunk of patch */ 301 hunk = 0; 302 failed = 0; 303 out_of_mem = false; 304 while (another_hunk()) { 305 hunk++; 306 fuzz = 0; 307 mymaxfuzz = pch_context(); 308 if (maxfuzz < mymaxfuzz) 309 mymaxfuzz = maxfuzz; 310 if (!skip_rest_of_patch) { 311 do { 312 where = locate_hunk(fuzz); 313 if ((hunk == 1 && where == 0 && !force) || 314 (where == 1 && pch_ptrn_lines() == 0 && !force)) { 315 /* dwim for reversed patch? */ 316 if (!pch_swap()) { 317 if (fuzz == 0) 318 say("Not enough memory to try swapped hunk! Assuming unswapped.\n"); 319 continue; 320 } 321 reverse = !reverse; 322 /* try again */ 323 where = locate_hunk(fuzz); 324 if (where == 0) { 325 /* didn't find it swapped */ 326 if (!pch_swap()) 327 /* put it back to normal */ 328 fatal("lost hunk on alloc error!\n"); 329 reverse = !reverse; 330 331 /* restore position if this patch creates a file */ 332 if (pch_ptrn_lines() == 0) 333 where = 1; 334 } else if (noreverse) { 335 if (!pch_swap()) 336 /* put it back to normal */ 337 fatal("lost hunk on alloc error!\n"); 338 reverse = !reverse; 339 say("Ignoring previously applied (or reversed) patch.\n"); 340 skip_rest_of_patch = true; 341 } else if (batch) { 342 if (verbose) 343 say("%seversed (or previously applied) patch detected! %s -R.", 344 reverse ? "R" : "Unr", 345 reverse ? "Assuming" : "Ignoring"); 346 } else { 347 ask("%seversed (or previously applied) patch detected! %s -R? [y] ", 348 reverse ? "R" : "Unr", 349 reverse ? "Assume" : "Ignore"); 350 if (*buf == 'n') { 351 ask("Apply anyway? [n] "); 352 if (*buf != 'y') 353 skip_rest_of_patch = true; 354 where = 0; 355 reverse = !reverse; 356 if (!pch_swap()) 357 /* put it back to normal */ 358 fatal("lost hunk on alloc error!\n"); 359 } 360 } 361 } 362 } while (!skip_rest_of_patch && where == 0 && 363 ++fuzz <= mymaxfuzz); 364 365 if (skip_rest_of_patch) { /* just got decided */ 366 fclose(ofp); 367 ofp = NULL; 368 } 369 } 370 newwhere = pch_newfirst() + last_offset; 371 if (skip_rest_of_patch) { 372 abort_hunk(); 373 failed++; 374 if (verbose) 375 say("Hunk #%d ignored at %ld.\n", 376 hunk, newwhere); 377 } else if (where == 0) { 378 abort_hunk(); 379 failed++; 380 if (verbose) 381 say("Hunk #%d failed at %ld.\n", 382 hunk, newwhere); 383 } else { 384 apply_hunk(where); 385 if (verbose) { 386 say("Hunk #%d succeeded at %ld", 387 hunk, newwhere); 388 if (fuzz != 0) 389 say(" with fuzz %ld", fuzz); 390 if (last_offset) 391 say(" (offset %ld line%s)", 392 last_offset, 393 last_offset == 1L ? "" : "s"); 394 say(".\n"); 395 } 396 } 397 } 398 399 if (out_of_mem && using_plan_a) { 400 Argc = Argc_last; 401 Argv = Argv_last; 402 say("\n\nRan out of memory using Plan A--trying again...\n\n"); 403 if (ofp) 404 fclose(ofp); 405 ofp = NULL; 406 if (rejfp) 407 fclose(rejfp); 408 rejfp = NULL; 409 continue; 410 } 411 if (hunk == 0) 412 fatal("Internal error: hunk should not be 0\n"); 413 414 /* finish spewing out the new file */ 415 if (!skip_rest_of_patch) 416 spew_output(); 417 418 /* and put the output where desired */ 419 ignore_signals(); 420 if (!skip_rest_of_patch) { 421 struct stat statbuf; 422 char *realout = outname; 423 424 if (!check_only) { 425 if (move_file(TMPOUTNAME, outname) < 0) { 426 toutkeep = true; 427 realout = TMPOUTNAME; 428 chmod(TMPOUTNAME, filemode); 429 } else 430 chmod(outname, filemode); 431 432 if (remove_empty_files && 433 stat(realout, &statbuf) == 0 && 434 statbuf.st_size == 0) { 435 if (verbose) 436 say("Removing %s (empty after patching).\n", 437 realout); 438 unlink(realout); 439 } 440 } 441 } 442 fclose(rejfp); 443 rejfp = NULL; 444 if (failed) { 445 error = 1; 446 if (*rejname == '\0') { 447 if (strlcpy(rejname, outname, 448 sizeof(rejname)) >= sizeof(rejname)) 449 fatal("filename %s is too long\n", outname); 450 if (strlcat(rejname, REJEXT, 451 sizeof(rejname)) >= sizeof(rejname)) 452 fatal("filename %s is too long\n", outname); 453 } 454 if (!check_only) 455 say("%d out of %d hunks %s--saving rejects to %s\n", 456 failed, hunk, skip_rest_of_patch ? "ignored" : "failed", rejname); 457 else 458 say("%d out of %d hunks %s\n", 459 failed, hunk, skip_rest_of_patch ? "ignored" : "failed"); 460 if (!check_only && move_file(TMPREJNAME, rejname) < 0) 461 trejkeep = true; 462 } 463 set_signals(1); 464 } 465 466 if (!patch_seen) 467 error = 2; 468 469 my_exit(error); 470 /* NOTREACHED */ 471 } 472 473 /* Prepare to find the next patch to do in the patch file. */ 474 475 static void 476 reinitialize_almost_everything(void) 477 { 478 re_patch(); 479 re_input(); 480 481 input_lines = 0; 482 last_frozen_line = 0; 483 484 filec = 0; 485 if (!out_of_mem) { 486 free(filearg[0]); 487 filearg[0] = NULL; 488 } 489 490 free(outname); 491 outname = NULL; 492 493 last_offset = 0; 494 diff_type = 0; 495 496 free(revision); 497 revision = NULL; 498 499 reverse = reverse_flag_specified; 500 skip_rest_of_patch = false; 501 502 get_some_switches(); 503 } 504 505 /* Process switches and filenames. */ 506 507 static void 508 get_some_switches(void) 509 { 510 const char *options = "b::B:cCd:D:eEfF:i:lnNo:p:r:RstuvV:x:z:"; 511 static struct option longopts[] = { 512 {"backup", no_argument, 0, 'b'}, 513 {"batch", no_argument, 0, 't'}, 514 {"check", no_argument, 0, 'C'}, 515 {"context", no_argument, 0, 'c'}, 516 {"debug", required_argument, 0, 'x'}, 517 {"directory", required_argument, 0, 'd'}, 518 {"dry-run", no_argument, 0, 'C'}, 519 {"ed", no_argument, 0, 'e'}, 520 {"force", no_argument, 0, 'f'}, 521 {"forward", no_argument, 0, 'N'}, 522 {"fuzz", required_argument, 0, 'F'}, 523 {"ifdef", required_argument, 0, 'D'}, 524 {"input", required_argument, 0, 'i'}, 525 {"ignore-whitespace", no_argument, 0, 'l'}, 526 {"normal", no_argument, 0, 'n'}, 527 {"output", required_argument, 0, 'o'}, 528 {"prefix", required_argument, 0, 'B'}, 529 {"quiet", no_argument, 0, 's'}, 530 {"reject-file", required_argument, 0, 'r'}, 531 {"remove-empty-files", no_argument, 0, 'E'}, 532 {"reverse", no_argument, 0, 'R'}, 533 {"silent", no_argument, 0, 's'}, 534 {"strip", required_argument, 0, 'p'}, 535 {"suffix", required_argument, 0, 'z'}, 536 {"unified", no_argument, 0, 'u'}, 537 {"version", no_argument, 0, 'v'}, 538 {"version-control", required_argument, 0, 'V'}, 539 {"posix", no_argument, &posix, 1}, 540 {NULL, 0, 0, 0} 541 }; 542 int ch; 543 544 rejname[0] = '\0'; 545 Argc_last = Argc; 546 Argv_last = Argv; 547 if (!Argc) 548 return; 549 optreset = optind = 1; 550 while ((ch = getopt_long(Argc, Argv, options, longopts, NULL)) != -1) { 551 switch (ch) { 552 case 'b': 553 if (backup_type == none) 554 backup_type = numbered_existing; 555 if (optarg == NULL) 556 break; 557 if (verbose) 558 say("Warning, the ``-b suffix'' option has been" 559 " obsoleted by the -z option.\n"); 560 /* FALLTHROUGH */ 561 case 'z': 562 /* must directly follow 'b' case for backwards compat */ 563 simple_backup_suffix = xstrdup(optarg); 564 break; 565 case 'B': 566 origprae = xstrdup(optarg); 567 break; 568 case 'c': 569 diff_type = CONTEXT_DIFF; 570 break; 571 case 'C': 572 check_only = true; 573 break; 574 case 'd': 575 if (chdir(optarg) == -1) 576 pfatal("can't cd to %s", optarg); 577 break; 578 case 'D': 579 do_defines = true; 580 if (!isalpha((unsigned char)*optarg) && *optarg != '_') 581 fatal("argument to -D is not an identifier\n"); 582 snprintf(if_defined, sizeof if_defined, 583 "#ifdef %s\n", optarg); 584 snprintf(not_defined, sizeof not_defined, 585 "#ifndef %s\n", optarg); 586 snprintf(end_defined, sizeof end_defined, 587 "#endif /* %s */\n", optarg); 588 break; 589 case 'e': 590 diff_type = ED_DIFF; 591 break; 592 case 'E': 593 remove_empty_files = true; 594 break; 595 case 'f': 596 force = true; 597 break; 598 case 'F': 599 maxfuzz = atoi(optarg); 600 break; 601 case 'i': 602 if (++filec == MAXFILEC) 603 fatal("too many file arguments\n"); 604 filearg[filec] = xstrdup(optarg); 605 break; 606 case 'l': 607 canonicalize = true; 608 break; 609 case 'n': 610 diff_type = NORMAL_DIFF; 611 break; 612 case 'N': 613 noreverse = true; 614 break; 615 case 'o': 616 outname = xstrdup(optarg); 617 break; 618 case 'p': 619 strippath = atoi(optarg); 620 break; 621 case 'r': 622 if (strlcpy(rejname, optarg, 623 sizeof(rejname)) >= sizeof(rejname)) 624 fatal("argument for -r is too long\n"); 625 break; 626 case 'R': 627 reverse = true; 628 reverse_flag_specified = true; 629 break; 630 case 's': 631 verbose = false; 632 break; 633 case 't': 634 batch = true; 635 break; 636 case 'u': 637 diff_type = UNI_DIFF; 638 break; 639 case 'v': 640 version(); 641 break; 642 case 'V': 643 backup_type = get_version(optarg); 644 break; 645 #ifdef DEBUGGING 646 case 'x': 647 debug = atoi(optarg); 648 break; 649 #endif 650 default: 651 if (ch != '\0') 652 usage(); 653 break; 654 } 655 } 656 Argc -= optind; 657 Argv += optind; 658 659 if (Argc > 0) { 660 filearg[0] = xstrdup(*Argv++); 661 Argc--; 662 while (Argc > 0) { 663 if (++filec == MAXFILEC) 664 fatal("too many file arguments\n"); 665 filearg[filec] = xstrdup(*Argv++); 666 Argc--; 667 } 668 } 669 670 if (getenv("POSIXLY_CORRECT") != NULL) 671 posix = 1; 672 } 673 674 static __dead void 675 usage(void) 676 { 677 fprintf(stderr, 678 "usage: patch [-bCcEeflNnRstuv] [-B backup-prefix] [-D symbol] [-d directory]\n" 679 " [-F max-fuzz] [-i patchfile] [-o out-file] [-p strip-count]\n" 680 " [-r rej-name] [-V t | nil | never] [-x number] [-z backup-ext]\n" 681 " [--posix] [origfile [patchfile]]\n" 682 " patch <patchfile\n"); 683 my_exit(2); 684 } 685 686 /* 687 * Attempt to find the right place to apply this hunk of patch. 688 */ 689 static LINENUM 690 locate_hunk(LINENUM fuzz) 691 { 692 LINENUM first_guess = pch_first() + last_offset; 693 LINENUM offset; 694 LINENUM pat_lines = pch_ptrn_lines(); 695 LINENUM max_pos_offset = input_lines - first_guess - pat_lines + 1; 696 LINENUM max_neg_offset = first_guess - last_frozen_line - 1 + pch_context(); 697 698 if (pat_lines == 0) { /* null range matches always */ 699 if (verbose && fuzz == 0 && (diff_type == CONTEXT_DIFF 700 || diff_type == NEW_CONTEXT_DIFF 701 || diff_type == UNI_DIFF)) { 702 say("Empty context always matches.\n"); 703 } 704 if (first_guess == 0) 705 return 1; 706 return (first_guess); 707 } 708 if (max_neg_offset >= first_guess) /* do not try lines < 0 */ 709 max_neg_offset = first_guess - 1; 710 if (first_guess <= input_lines && patch_match(first_guess, 0, fuzz)) 711 return first_guess; 712 for (offset = 1; ; offset++) { 713 bool check_after = (offset <= max_pos_offset); 714 bool check_before = (offset <= max_neg_offset); 715 716 if (check_after && patch_match(first_guess, offset, fuzz)) { 717 #ifdef DEBUGGING 718 if (debug & 1) 719 say("Offset changing from %ld to %ld\n", 720 last_offset, offset); 721 #endif 722 last_offset = offset; 723 return first_guess + offset; 724 } else if (check_before && patch_match(first_guess, -offset, fuzz)) { 725 #ifdef DEBUGGING 726 if (debug & 1) 727 say("Offset changing from %ld to %ld\n", 728 last_offset, -offset); 729 #endif 730 last_offset = -offset; 731 return first_guess - offset; 732 } else if (!check_before && !check_after) 733 return 0; 734 } 735 } 736 737 /* We did not find the pattern, dump out the hunk so they can handle it. */ 738 739 static void 740 abort_context_hunk(void) 741 { 742 LINENUM i; 743 const LINENUM pat_end = pch_end(); 744 /* 745 * add in last_offset to guess the same as the previous successful 746 * hunk 747 */ 748 const LINENUM oldfirst = pch_first() + last_offset; 749 const LINENUM newfirst = pch_newfirst() + last_offset; 750 const LINENUM oldlast = oldfirst + pch_ptrn_lines() - 1; 751 const LINENUM newlast = newfirst + pch_repl_lines() - 1; 752 const char *stars = (diff_type >= NEW_CONTEXT_DIFF ? " ****" : ""); 753 const char *minuses = (diff_type >= NEW_CONTEXT_DIFF ? " ----" : " -----"); 754 755 fprintf(rejfp, "***************\n"); 756 for (i = 0; i <= pat_end; i++) { 757 switch (pch_char(i)) { 758 case '*': 759 if (oldlast < oldfirst) 760 fprintf(rejfp, "*** 0%s\n", stars); 761 else if (oldlast == oldfirst) 762 fprintf(rejfp, "*** %ld%s\n", oldfirst, stars); 763 else 764 fprintf(rejfp, "*** %ld,%ld%s\n", oldfirst, 765 oldlast, stars); 766 break; 767 case '=': 768 if (newlast < newfirst) 769 fprintf(rejfp, "--- 0%s\n", minuses); 770 else if (newlast == newfirst) 771 fprintf(rejfp, "--- %ld%s\n", newfirst, minuses); 772 else 773 fprintf(rejfp, "--- %ld,%ld%s\n", newfirst, 774 newlast, minuses); 775 break; 776 case '\n': 777 fprintf(rejfp, "%s", pfetch(i)); 778 break; 779 case ' ': 780 case '-': 781 case '+': 782 case '!': 783 fprintf(rejfp, "%c %s", pch_char(i), pfetch(i)); 784 break; 785 default: 786 fatal("fatal internal error in abort_context_hunk\n"); 787 } 788 } 789 } 790 791 static void 792 rej_line(int ch, LINENUM i) 793 { 794 size_t len; 795 const char *line = pfetch(i); 796 797 len = strlen(line); 798 799 fprintf(rejfp, "%c%s", ch, line); 800 if (len == 0 || line[len-1] != '\n') 801 fprintf(rejfp, "\n\\ No newline at end of file\n"); 802 } 803 804 static void 805 abort_hunk(void) 806 { 807 LINENUM i, j, split; 808 int ch1, ch2; 809 const LINENUM pat_end = pch_end(); 810 const LINENUM oldfirst = pch_first() + last_offset; 811 const LINENUM newfirst = pch_newfirst() + last_offset; 812 813 if (diff_type != UNI_DIFF) { 814 abort_context_hunk(); 815 return; 816 } 817 split = -1; 818 for (i = 0; i <= pat_end; i++) { 819 if (pch_char(i) == '=') { 820 split = i; 821 break; 822 } 823 } 824 if (split == -1) { 825 fprintf(rejfp, "malformed hunk: no split found\n"); 826 return; 827 } 828 i = 0; 829 j = split + 1; 830 fprintf(rejfp, "@@ -%ld,%ld +%ld,%ld @@\n", 831 pch_ptrn_lines() ? oldfirst : 0, 832 pch_ptrn_lines(), newfirst, pch_repl_lines()); 833 while (i < split || j <= pat_end) { 834 ch1 = i < split ? pch_char(i) : -1; 835 ch2 = j <= pat_end ? pch_char(j) : -1; 836 if (ch1 == '-') { 837 rej_line('-', i); 838 i++; 839 } else if (ch1 == ' ' && ch2 == ' ') { 840 rej_line(' ', i); 841 i++; 842 j++; 843 } else if (ch1 == '!' && ch2 == '!') { 844 while (i < split && ch1 == '!') { 845 rej_line('-', i); 846 i++; 847 ch1 = i < split ? pch_char(i) : -1; 848 } 849 while (j <= pat_end && ch2 == '!') { 850 rej_line('+', j); 851 j++; 852 ch2 = j <= pat_end ? pch_char(j) : -1; 853 } 854 } else if (ch1 == '*') { 855 i++; 856 } else if (ch2 == '+' || ch2 == ' ') { 857 rej_line(ch2, j); 858 j++; 859 } else { 860 fprintf(rejfp, "internal error on (%ld %ld %ld)\n", 861 i, split, j); 862 rej_line(ch1, i); 863 rej_line(ch2, j); 864 return; 865 } 866 } 867 } 868 869 /* We found where to apply it (we hope), so do it. */ 870 871 static void 872 apply_hunk(LINENUM where) 873 { 874 LINENUM old = 1; 875 const LINENUM lastline = pch_ptrn_lines(); 876 LINENUM new = lastline + 1; 877 #define OUTSIDE 0 878 #define IN_IFNDEF 1 879 #define IN_IFDEF 2 880 #define IN_ELSE 3 881 int def_state = OUTSIDE; 882 const LINENUM pat_end = pch_end(); 883 884 where--; 885 while (pch_char(new) == '=' || pch_char(new) == '\n') 886 new++; 887 888 while (old <= lastline) { 889 if (pch_char(old) == '-') { 890 copy_till(where + old - 1, false); 891 if (do_defines) { 892 if (def_state == OUTSIDE) { 893 fputs(not_defined, ofp); 894 def_state = IN_IFNDEF; 895 } else if (def_state == IN_IFDEF) { 896 fputs(else_defined, ofp); 897 def_state = IN_ELSE; 898 } 899 fputs(pfetch(old), ofp); 900 } 901 last_frozen_line++; 902 old++; 903 } else if (new > pat_end) { 904 break; 905 } else if (pch_char(new) == '+') { 906 copy_till(where + old - 1, false); 907 if (do_defines) { 908 if (def_state == IN_IFNDEF) { 909 fputs(else_defined, ofp); 910 def_state = IN_ELSE; 911 } else if (def_state == OUTSIDE) { 912 fputs(if_defined, ofp); 913 def_state = IN_IFDEF; 914 } 915 } 916 fputs(pfetch(new), ofp); 917 new++; 918 } else if (pch_char(new) != pch_char(old)) { 919 say("Out-of-sync patch, lines %ld,%ld--mangled text or line numbers, maybe?\n", 920 pch_hunk_beg() + old, 921 pch_hunk_beg() + new); 922 #ifdef DEBUGGING 923 say("oldchar = '%c', newchar = '%c'\n", 924 pch_char(old), pch_char(new)); 925 #endif 926 my_exit(2); 927 } else if (pch_char(new) == '!') { 928 copy_till(where + old - 1, false); 929 if (do_defines) { 930 fputs(not_defined, ofp); 931 def_state = IN_IFNDEF; 932 } 933 while (pch_char(old) == '!') { 934 if (do_defines) { 935 fputs(pfetch(old), ofp); 936 } 937 last_frozen_line++; 938 old++; 939 } 940 if (do_defines) { 941 fputs(else_defined, ofp); 942 def_state = IN_ELSE; 943 } 944 while (pch_char(new) == '!') { 945 fputs(pfetch(new), ofp); 946 new++; 947 } 948 } else { 949 if (pch_char(new) != ' ') 950 fatal("Internal error: expected ' '\n"); 951 old++; 952 new++; 953 if (do_defines && def_state != OUTSIDE) { 954 fputs(end_defined, ofp); 955 def_state = OUTSIDE; 956 } 957 } 958 } 959 if (new <= pat_end && pch_char(new) == '+') { 960 copy_till(where + old - 1, false); 961 if (do_defines) { 962 if (def_state == OUTSIDE) { 963 fputs(if_defined, ofp); 964 def_state = IN_IFDEF; 965 } else if (def_state == IN_IFNDEF) { 966 fputs(else_defined, ofp); 967 def_state = IN_ELSE; 968 } 969 } 970 while (new <= pat_end && pch_char(new) == '+') { 971 fputs(pfetch(new), ofp); 972 new++; 973 } 974 } 975 if (do_defines && def_state != OUTSIDE) { 976 fputs(end_defined, ofp); 977 } 978 } 979 980 /* 981 * Open the new file. 982 */ 983 static void 984 init_output(const char *name) 985 { 986 ofp = fopen(name, "w"); 987 if (ofp == NULL) 988 pfatal("can't create %s", name); 989 } 990 991 /* 992 * Open a file to put hunks we can't locate. 993 */ 994 static void 995 init_reject(const char *name) 996 { 997 rejfp = fopen(name, "w"); 998 if (rejfp == NULL) 999 pfatal("can't create %s", name); 1000 } 1001 1002 /* 1003 * Copy input file to output, up to wherever hunk is to be applied. 1004 * If endoffile is true, treat the last line specially since it may 1005 * lack a newline. 1006 */ 1007 static void 1008 copy_till(LINENUM lastline, bool endoffile) 1009 { 1010 if (last_frozen_line > lastline) 1011 fatal("misordered hunks! output would be garbled\n"); 1012 while (last_frozen_line < lastline) { 1013 if (++last_frozen_line == lastline && endoffile) 1014 dump_line(last_frozen_line, !last_line_missing_eol); 1015 else 1016 dump_line(last_frozen_line, true); 1017 } 1018 } 1019 1020 /* 1021 * Finish copying the input file to the output file. 1022 */ 1023 static void 1024 spew_output(void) 1025 { 1026 #ifdef DEBUGGING 1027 if (debug & 256) 1028 say("il=%ld lfl=%ld\n", input_lines, last_frozen_line); 1029 #endif 1030 if (input_lines) 1031 copy_till(input_lines, true); /* dump remainder of file */ 1032 fclose(ofp); 1033 ofp = NULL; 1034 } 1035 1036 /* 1037 * Copy one line from input to output. 1038 */ 1039 static void 1040 dump_line(LINENUM line, bool write_newline) 1041 { 1042 char *s; 1043 1044 s = ifetch(line, 0); 1045 if (s == NULL) 1046 return; 1047 /* Note: string is not NUL terminated. */ 1048 for (; *s != '\n'; s++) 1049 putc(*s, ofp); 1050 if (write_newline) 1051 putc('\n', ofp); 1052 } 1053 1054 /* 1055 * Does the patch pattern match at line base+offset? 1056 */ 1057 static bool 1058 patch_match(LINENUM base, LINENUM offset, LINENUM fuzz) 1059 { 1060 LINENUM pline = 1 + fuzz; 1061 LINENUM iline; 1062 LINENUM pat_lines = pch_ptrn_lines() - fuzz; 1063 const char *ilineptr; 1064 const char *plineptr; 1065 ssize_t plinelen; 1066 1067 for (iline = base + offset + fuzz; pline <= pat_lines; pline++, iline++) { 1068 ilineptr = ifetch(iline, offset >= 0); 1069 if (ilineptr == NULL) 1070 return false; 1071 plineptr = pfetch(pline); 1072 plinelen = pch_line_len(pline); 1073 if (canonicalize) { 1074 if (!similar(ilineptr, plineptr, plinelen)) 1075 return false; 1076 } else if (strnNE(ilineptr, plineptr, plinelen)) 1077 return false; 1078 if (iline == input_lines) { 1079 /* 1080 * We are looking at the last line of the file. 1081 * If the file has no eol, the patch line should 1082 * not have one either and vice-versa. Note that 1083 * plinelen > 0. 1084 */ 1085 if (last_line_missing_eol) { 1086 if (plineptr[plinelen - 1] == '\n') 1087 return false; 1088 } else { 1089 if (plineptr[plinelen - 1] != '\n') 1090 return false; 1091 } 1092 } 1093 } 1094 return true; 1095 } 1096 1097 /* 1098 * Do two lines match with canonicalized white space? 1099 */ 1100 static bool 1101 similar(const char *a, const char *b, ssize_t len) 1102 { 1103 while (len) { 1104 if (isspace((unsigned char)*b)) { /* whitespace (or \n) to match? */ 1105 if (!isspace((unsigned char)*a)) 1106 return false; /* no corresponding whitespace */ 1107 while (len && isspace((unsigned char)*b) && *b != '\n') 1108 b++, len--; /* skip pattern whitespace */ 1109 while (isspace((unsigned char)*a) && *a != '\n') 1110 a++; /* skip target whitespace */ 1111 if (*a == '\n' || *b == '\n') 1112 return (*a == *b); /* should end in sync */ 1113 } else if (*a++ != *b++) /* match non-whitespace chars */ 1114 return false; 1115 else 1116 len--; /* probably not necessary */ 1117 } 1118 return true; /* actually, this is not reached */ 1119 /* since there is always a \n */ 1120 } 1121