1 /* $OpenBSD: patch.c,v 1.74 2023/07/19 13:26:20 tb 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 <limits.h> 36 #include <paths.h> 37 #include <stdio.h> 38 #include <string.h> 39 #include <stdlib.h> 40 41 #include "common.h" 42 #include "util.h" 43 #include "pch.h" 44 #include "inp.h" 45 #include "backupfile.h" 46 #include "ed.h" 47 48 mode_t filemode = 0644; 49 50 char *buf; /* general purpose buffer */ 51 size_t bufsz; /* general purpose buffer size */ 52 53 bool using_plan_a = true; /* try to keep everything in memory */ 54 bool out_of_mem = false; /* ran out of memory in plan a */ 55 56 #define MAXFILEC 2 57 58 char *filearg[MAXFILEC]; 59 bool ok_to_create_file = false; 60 char *outname = NULL; 61 char *origprae = NULL; 62 char *TMPOUTNAME; 63 char *TMPINNAME; 64 char *TMPREJNAME; 65 char *TMPPATNAME; 66 bool toutkeep = false; 67 bool trejkeep = false; 68 bool warn_on_invalid_line; 69 bool last_line_missing_eol; 70 71 #ifdef DEBUGGING 72 int debug = 0; 73 #endif 74 75 bool force = false; 76 bool batch = false; 77 bool verbose = true; 78 bool reverse = false; 79 bool noreverse = false; 80 bool skip_rest_of_patch = false; 81 int strippath = 957; 82 bool canonicalize = false; 83 bool check_only = false; 84 int diff_type = 0; 85 char *revision = NULL; /* prerequisite revision, if any */ 86 LINENUM input_lines = 0; /* how long is input file in lines */ 87 int posix = 0; /* strict POSIX mode? */ 88 89 static void reinitialize_almost_everything(void); 90 static void get_some_switches(void); 91 static LINENUM locate_hunk(LINENUM); 92 static void abort_context_hunk(void); 93 static void rej_line(int, LINENUM); 94 static void abort_hunk(void); 95 static void apply_hunk(LINENUM); 96 static void init_output(const char *); 97 static void init_reject(const char *); 98 static void copy_till(LINENUM, bool); 99 static void spew_output(void); 100 static void dump_line(LINENUM, bool); 101 static bool patch_match(LINENUM, LINENUM, LINENUM); 102 static bool similar(const char *, const char *, ssize_t); 103 static __dead void usage(void); 104 105 /* true if -E was specified on command line. */ 106 static bool remove_empty_files = false; 107 108 /* true if -R was specified on command line. */ 109 static bool reverse_flag_specified = false; 110 111 /* buffer holding the name of the rejected patch file. */ 112 static char rejname[PATH_MAX]; 113 114 /* how many input lines have been irretractibly output */ 115 static LINENUM last_frozen_line = 0; 116 117 static int Argc; /* guess */ 118 static char **Argv; 119 static int Argc_last; /* for restarting plan_b */ 120 static char **Argv_last; 121 122 static FILE *ofp = NULL; /* output file pointer */ 123 static FILE *rejfp = NULL; /* reject file pointer */ 124 125 static int filec = 0; /* how many file arguments? */ 126 static LINENUM last_offset = 0; 127 static LINENUM maxfuzz = 2; 128 129 /* patch using ifdef, ifndef, etc. */ 130 static bool do_defines = false; 131 /* #ifdef xyzzy */ 132 static char if_defined[128]; 133 /* #ifndef xyzzy */ 134 static char not_defined[128]; 135 /* #else */ 136 static const char else_defined[] = "#else\n"; 137 /* #endif xyzzy */ 138 static char end_defined[128]; 139 140 141 /* Apply a set of diffs as appropriate. */ 142 143 int 144 main(int argc, char *argv[]) 145 { 146 int error = 0, hunk, failed, i, fd; 147 bool patch_seen; 148 LINENUM where = 0, newwhere, fuzz, mymaxfuzz; 149 const char *tmpdir; 150 char *v; 151 152 if (pledge("stdio rpath wpath cpath tmppath fattr unveil", NULL) == -1) { 153 perror("pledge"); 154 my_exit(2); 155 } 156 157 bufsz = INITLINELEN; 158 if ((buf = malloc(bufsz)) == NULL) 159 pfatal("allocating input buffer"); 160 buf[0] = '\0'; 161 162 setvbuf(stdout, NULL, _IOLBF, 0); 163 setvbuf(stderr, NULL, _IOLBF, 0); 164 for (i = 0; i < MAXFILEC; i++) 165 filearg[i] = NULL; 166 167 /* Cons up the names of the temporary files. */ 168 if ((tmpdir = getenv("TMPDIR")) == NULL || *tmpdir == '\0') 169 tmpdir = _PATH_TMP; 170 for (i = strlen(tmpdir) - 1; i > 0 && tmpdir[i] == '/'; i--) 171 ; 172 i++; 173 if (asprintf(&TMPOUTNAME, "%.*s/patchoXXXXXXXXXX", i, tmpdir) == -1) 174 fatal("cannot allocate memory"); 175 if ((fd = mkstemp(TMPOUTNAME)) == -1) 176 pfatal("can't create %s", TMPOUTNAME); 177 close(fd); 178 179 if (asprintf(&TMPINNAME, "%.*s/patchiXXXXXXXXXX", i, tmpdir) == -1) 180 fatal("cannot allocate memory"); 181 if ((fd = mkstemp(TMPINNAME)) == -1) 182 pfatal("can't create %s", TMPINNAME); 183 close(fd); 184 185 if (asprintf(&TMPREJNAME, "%.*s/patchrXXXXXXXXXX", i, tmpdir) == -1) 186 fatal("cannot allocate memory"); 187 if ((fd = mkstemp(TMPREJNAME)) == -1) 188 pfatal("can't create %s", TMPREJNAME); 189 close(fd); 190 191 if (asprintf(&TMPPATNAME, "%.*s/patchpXXXXXXXXXX", i, tmpdir) == -1) 192 fatal("cannot allocate memory"); 193 if ((fd = mkstemp(TMPPATNAME)) == -1) 194 pfatal("can't create %s", TMPPATNAME); 195 close(fd); 196 197 v = getenv("SIMPLE_BACKUP_SUFFIX"); 198 if (v) 199 simple_backup_suffix = v; 200 else 201 simple_backup_suffix = ORIGEXT; 202 203 /* parse switches */ 204 Argc = argc; 205 Argv = argv; 206 get_some_switches(); 207 if (unveil(tmpdir, "rwc") == -1) { 208 perror("unveil"); 209 my_exit(2); 210 } 211 if (outname != NULL) 212 if (unveil(outname, "rwc") == -1) { 213 perror("unveil"); 214 my_exit(2); 215 } 216 if (filearg[0] != NULL) 217 if (unveil(filearg[0], "rwc") == -1) { 218 perror("unveil"); 219 my_exit(2); 220 } 221 if (filearg[1] != NULL) 222 if (unveil(filearg[1], "r") == -1) { 223 perror("unveil"); 224 my_exit(2); 225 } 226 if (!force && !batch) 227 if (unveil(_PATH_TTY, "r") == -1) { 228 perror("unveil"); 229 my_exit(2); 230 } 231 if (unveil(".", "rwc") == -1) { 232 perror("unveil"); 233 my_exit(2); 234 } 235 if (*rejname != '\0') 236 if (unveil(rejname, "rwc") == -1) { 237 perror("unveil"); 238 my_exit(2); 239 } 240 if (pledge("stdio rpath wpath cpath tmppath fattr", NULL) == -1) { 241 perror("pledge"); 242 my_exit(2); 243 } 244 245 if (backup_type == none) { 246 if ((v = getenv("PATCH_VERSION_CONTROL")) == NULL) 247 v = getenv("VERSION_CONTROL"); 248 if (v != NULL || !posix) 249 backup_type = get_version(v); /* OK to pass NULL. */ 250 } 251 252 /* make sure we clean up /tmp in case of disaster */ 253 set_signals(0); 254 255 patch_seen = false; 256 for (open_patch_file(filearg[1]); there_is_another_patch(); 257 reinitialize_almost_everything()) { 258 /* for each patch in patch file */ 259 260 patch_seen = true; 261 262 warn_on_invalid_line = true; 263 264 if (outname == NULL) 265 outname = xstrdup(filearg[0]); 266 267 /* initialize the patched file */ 268 if (!skip_rest_of_patch) 269 init_output(TMPOUTNAME); 270 271 /* initialize reject file */ 272 init_reject(TMPREJNAME); 273 274 /* find out where all the lines are */ 275 if (!skip_rest_of_patch) 276 scan_input(filearg[0]); 277 278 /* for ed script just up and do it and exit */ 279 if (diff_type == ED_DIFF) { 280 do_ed_script(); 281 continue; 282 } 283 284 /* from here on, open no standard i/o files, because malloc */ 285 /* might misfire and we can't catch it easily */ 286 287 /* apply each hunk of patch */ 288 hunk = 0; 289 failed = 0; 290 out_of_mem = false; 291 while (another_hunk()) { 292 hunk++; 293 fuzz = 0; 294 mymaxfuzz = pch_context(); 295 if (maxfuzz < mymaxfuzz) 296 mymaxfuzz = maxfuzz; 297 if (!skip_rest_of_patch) { 298 do { 299 where = locate_hunk(fuzz); 300 if ((hunk == 1 && where == 0 && !force) || 301 (where == 1 && pch_ptrn_lines() == 0 && !force)) { 302 /* dwim for reversed patch? */ 303 if (!pch_swap()) { 304 if (fuzz == 0) 305 say("Not enough memory to try swapped hunk! Assuming unswapped.\n"); 306 continue; 307 } 308 reverse = !reverse; 309 /* try again */ 310 where = locate_hunk(fuzz); 311 if (where == 0) { 312 /* didn't find it swapped */ 313 if (!pch_swap()) 314 /* put it back to normal */ 315 fatal("lost hunk on alloc error!\n"); 316 reverse = !reverse; 317 318 /* restore position if this patch creates a file */ 319 if (pch_ptrn_lines() == 0) 320 where = 1; 321 } else if (noreverse) { 322 if (!pch_swap()) 323 /* put it back to normal */ 324 fatal("lost hunk on alloc error!\n"); 325 reverse = !reverse; 326 say("Ignoring previously applied (or reversed) patch.\n"); 327 skip_rest_of_patch = true; 328 } else if (batch) { 329 if (verbose) 330 say("%seversed (or previously applied) patch detected! %s -R.", 331 reverse ? "R" : "Unr", 332 reverse ? "Assuming" : "Ignoring"); 333 } else { 334 ask("%seversed (or previously applied) patch detected! %s -R? [y] ", 335 reverse ? "R" : "Unr", 336 reverse ? "Assume" : "Ignore"); 337 if (*buf == 'n') { 338 ask("Apply anyway? [n] "); 339 if (*buf != 'y') 340 skip_rest_of_patch = true; 341 where = 0; 342 reverse = !reverse; 343 if (!pch_swap()) 344 /* put it back to normal */ 345 fatal("lost hunk on alloc error!\n"); 346 } 347 } 348 } 349 } while (!skip_rest_of_patch && where == 0 && 350 ++fuzz <= mymaxfuzz); 351 352 if (skip_rest_of_patch) { /* just got decided */ 353 fclose(ofp); 354 ofp = NULL; 355 } 356 } 357 newwhere = pch_newfirst() + last_offset; 358 if (skip_rest_of_patch) { 359 abort_hunk(); 360 failed++; 361 if (verbose) 362 say("Hunk #%d ignored at %ld.\n", 363 hunk, newwhere); 364 } else if (where == 0) { 365 abort_hunk(); 366 failed++; 367 if (verbose) 368 say("Hunk #%d failed at %ld.\n", 369 hunk, newwhere); 370 } else { 371 apply_hunk(where); 372 if (verbose) { 373 say("Hunk #%d succeeded at %ld", 374 hunk, newwhere); 375 if (fuzz != 0) 376 say(" with fuzz %ld", fuzz); 377 if (last_offset) 378 say(" (offset %ld line%s)", 379 last_offset, 380 last_offset == 1L ? "" : "s"); 381 say(".\n"); 382 } 383 } 384 } 385 386 if (out_of_mem && using_plan_a) { 387 Argc = Argc_last; 388 Argv = Argv_last; 389 say("\n\nRan out of memory using Plan A--trying again...\n\n"); 390 if (ofp) 391 fclose(ofp); 392 ofp = NULL; 393 if (rejfp) 394 fclose(rejfp); 395 rejfp = NULL; 396 continue; 397 } 398 if (hunk == 0) 399 fatal("Internal error: hunk should not be 0\n"); 400 401 /* finish spewing out the new file */ 402 if (!skip_rest_of_patch) 403 spew_output(); 404 405 /* and put the output where desired */ 406 ignore_signals(); 407 if (!skip_rest_of_patch) { 408 struct stat statbuf; 409 char *realout = outname; 410 411 if (!check_only) { 412 if (move_file(TMPOUTNAME, outname) < 0) { 413 toutkeep = true; 414 realout = TMPOUTNAME; 415 chmod(TMPOUTNAME, filemode); 416 } else 417 chmod(outname, filemode); 418 419 if (remove_empty_files && 420 stat(realout, &statbuf) == 0 && 421 statbuf.st_size == 0) { 422 if (verbose) 423 say("Removing %s (empty after patching).\n", 424 realout); 425 unlink(realout); 426 } 427 } 428 } 429 fclose(rejfp); 430 rejfp = NULL; 431 if (failed) { 432 error = 1; 433 if (*rejname == '\0') { 434 if (strlcpy(rejname, outname, 435 sizeof(rejname)) >= sizeof(rejname)) 436 fatal("filename %s is too long\n", outname); 437 if (strlcat(rejname, REJEXT, 438 sizeof(rejname)) >= sizeof(rejname)) 439 fatal("filename %s is too long\n", outname); 440 } 441 if (!check_only) 442 say("%d out of %d hunks %s--saving rejects to %s\n", 443 failed, hunk, skip_rest_of_patch ? "ignored" : "failed", rejname); 444 else 445 say("%d out of %d hunks %s\n", 446 failed, hunk, skip_rest_of_patch ? "ignored" : "failed"); 447 if (!check_only && move_file(TMPREJNAME, rejname) < 0) 448 trejkeep = true; 449 } 450 set_signals(1); 451 } 452 453 if (!patch_seen) 454 error = 2; 455 456 my_exit(error); 457 /* NOTREACHED */ 458 } 459 460 /* Prepare to find the next patch to do in the patch file. */ 461 462 static void 463 reinitialize_almost_everything(void) 464 { 465 re_patch(); 466 re_input(); 467 468 input_lines = 0; 469 last_frozen_line = 0; 470 471 filec = 0; 472 if (!out_of_mem) { 473 free(filearg[0]); 474 filearg[0] = NULL; 475 } 476 477 free(outname); 478 outname = NULL; 479 480 last_offset = 0; 481 diff_type = 0; 482 483 free(revision); 484 revision = NULL; 485 486 reverse = reverse_flag_specified; 487 skip_rest_of_patch = false; 488 489 get_some_switches(); 490 } 491 492 /* Process switches and filenames. */ 493 494 static void 495 get_some_switches(void) 496 { 497 const char *options = "b::B:cCd:D:eEfF:i:lnNo:p:r:RstuvV:x:z:"; 498 static struct option longopts[] = { 499 {"backup", no_argument, 0, 'b'}, 500 {"batch", no_argument, 0, 't'}, 501 {"check", no_argument, 0, 'C'}, 502 {"context", no_argument, 0, 'c'}, 503 {"debug", required_argument, 0, 'x'}, 504 {"directory", required_argument, 0, 'd'}, 505 {"dry-run", no_argument, 0, 'C'}, 506 {"ed", no_argument, 0, 'e'}, 507 {"force", no_argument, 0, 'f'}, 508 {"forward", no_argument, 0, 'N'}, 509 {"fuzz", required_argument, 0, 'F'}, 510 {"ifdef", required_argument, 0, 'D'}, 511 {"input", required_argument, 0, 'i'}, 512 {"ignore-whitespace", no_argument, 0, 'l'}, 513 {"normal", no_argument, 0, 'n'}, 514 {"output", required_argument, 0, 'o'}, 515 {"prefix", required_argument, 0, 'B'}, 516 {"quiet", no_argument, 0, 's'}, 517 {"reject-file", required_argument, 0, 'r'}, 518 {"remove-empty-files", no_argument, 0, 'E'}, 519 {"reverse", no_argument, 0, 'R'}, 520 {"silent", no_argument, 0, 's'}, 521 {"strip", required_argument, 0, 'p'}, 522 {"suffix", required_argument, 0, 'z'}, 523 {"unified", no_argument, 0, 'u'}, 524 {"version", no_argument, 0, 'v'}, 525 {"version-control", required_argument, 0, 'V'}, 526 {"posix", no_argument, &posix, 1}, 527 {NULL, 0, 0, 0} 528 }; 529 int ch; 530 531 rejname[0] = '\0'; 532 Argc_last = Argc; 533 Argv_last = Argv; 534 if (!Argc) 535 return; 536 optreset = optind = 1; 537 while ((ch = getopt_long(Argc, Argv, options, longopts, NULL)) != -1) { 538 switch (ch) { 539 case 'b': 540 if (backup_type == none) 541 backup_type = numbered_existing; 542 if (optarg == NULL) 543 break; 544 if (verbose) 545 say("Warning, the ``-b suffix'' option has been" 546 " obsoleted by the -z option.\n"); 547 /* FALLTHROUGH */ 548 case 'z': 549 /* must directly follow 'b' case for backwards compat */ 550 simple_backup_suffix = xstrdup(optarg); 551 break; 552 case 'B': 553 origprae = xstrdup(optarg); 554 break; 555 case 'c': 556 diff_type = CONTEXT_DIFF; 557 break; 558 case 'C': 559 check_only = true; 560 break; 561 case 'd': 562 if (chdir(optarg) == -1) 563 pfatal("can't cd to %s", optarg); 564 break; 565 case 'D': 566 do_defines = true; 567 if (!isalpha((unsigned char)*optarg) && *optarg != '_') 568 fatal("argument to -D is not an identifier\n"); 569 snprintf(if_defined, sizeof if_defined, 570 "#ifdef %s\n", optarg); 571 snprintf(not_defined, sizeof not_defined, 572 "#ifndef %s\n", optarg); 573 snprintf(end_defined, sizeof end_defined, 574 "#endif /* %s */\n", optarg); 575 break; 576 case 'e': 577 diff_type = ED_DIFF; 578 break; 579 case 'E': 580 remove_empty_files = true; 581 break; 582 case 'f': 583 force = true; 584 break; 585 case 'F': 586 maxfuzz = atoi(optarg); 587 break; 588 case 'i': 589 if (++filec == MAXFILEC) 590 fatal("too many file arguments\n"); 591 filearg[filec] = xstrdup(optarg); 592 break; 593 case 'l': 594 canonicalize = true; 595 break; 596 case 'n': 597 diff_type = NORMAL_DIFF; 598 break; 599 case 'N': 600 noreverse = true; 601 break; 602 case 'o': 603 outname = xstrdup(optarg); 604 break; 605 case 'p': 606 strippath = atoi(optarg); 607 break; 608 case 'r': 609 if (strlcpy(rejname, optarg, 610 sizeof(rejname)) >= sizeof(rejname)) 611 fatal("argument for -r is too long\n"); 612 break; 613 case 'R': 614 reverse = true; 615 reverse_flag_specified = true; 616 break; 617 case 's': 618 verbose = false; 619 break; 620 case 't': 621 batch = true; 622 break; 623 case 'u': 624 diff_type = UNI_DIFF; 625 break; 626 case 'v': 627 version(); 628 break; 629 case 'V': 630 backup_type = get_version(optarg); 631 break; 632 #ifdef DEBUGGING 633 case 'x': 634 debug = atoi(optarg); 635 break; 636 #endif 637 default: 638 if (ch != '\0') 639 usage(); 640 break; 641 } 642 } 643 Argc -= optind; 644 Argv += optind; 645 646 if (Argc > 0) { 647 filearg[0] = xstrdup(*Argv++); 648 Argc--; 649 while (Argc > 0) { 650 if (++filec == MAXFILEC) 651 fatal("too many file arguments\n"); 652 filearg[filec] = xstrdup(*Argv++); 653 Argc--; 654 } 655 } 656 657 if (getenv("POSIXLY_CORRECT") != NULL) 658 posix = 1; 659 } 660 661 static __dead void 662 usage(void) 663 { 664 fprintf(stderr, 665 "usage: patch [-bCcEeflNnRstuv] [-B backup-prefix] [-D symbol] [-d directory]\n" 666 " [-F max-fuzz] [-i patchfile] [-o out-file] [-p strip-count]\n" 667 " [-r rej-name] [-V t | nil | never] [-x number] [-z backup-ext]\n" 668 " [--posix] [origfile [patchfile]]\n" 669 " patch <patchfile\n"); 670 my_exit(2); 671 } 672 673 /* 674 * Attempt to find the right place to apply this hunk of patch. 675 */ 676 static LINENUM 677 locate_hunk(LINENUM fuzz) 678 { 679 LINENUM first_guess = pch_first() + last_offset; 680 LINENUM offset; 681 LINENUM pat_lines = pch_ptrn_lines(); 682 LINENUM max_pos_offset = input_lines - first_guess - pat_lines + 1; 683 LINENUM max_neg_offset = first_guess - last_frozen_line - 1 + pch_context(); 684 685 if (pat_lines == 0) { /* null range matches always */ 686 if (verbose && fuzz == 0 && (diff_type == CONTEXT_DIFF 687 || diff_type == NEW_CONTEXT_DIFF 688 || diff_type == UNI_DIFF)) { 689 say("Empty context always matches.\n"); 690 } 691 if (first_guess == 0) 692 return 1; 693 return (first_guess); 694 } 695 if (max_neg_offset >= first_guess) /* do not try lines < 0 */ 696 max_neg_offset = first_guess - 1; 697 if (first_guess <= input_lines && patch_match(first_guess, 0, fuzz)) 698 return first_guess; 699 for (offset = 1; ; offset++) { 700 bool check_after = (offset <= max_pos_offset); 701 bool check_before = (offset <= max_neg_offset); 702 703 if (check_after && patch_match(first_guess, offset, fuzz)) { 704 #ifdef DEBUGGING 705 if (debug & 1) 706 say("Offset changing from %ld to %ld\n", 707 last_offset, offset); 708 #endif 709 last_offset = offset; 710 return first_guess + offset; 711 } else if (check_before && patch_match(first_guess, -offset, fuzz)) { 712 #ifdef DEBUGGING 713 if (debug & 1) 714 say("Offset changing from %ld to %ld\n", 715 last_offset, -offset); 716 #endif 717 last_offset = -offset; 718 return first_guess - offset; 719 } else if (!check_before && !check_after) 720 return 0; 721 } 722 } 723 724 /* We did not find the pattern, dump out the hunk so they can handle it. */ 725 726 static void 727 abort_context_hunk(void) 728 { 729 LINENUM i; 730 const LINENUM pat_end = pch_end(); 731 /* 732 * add in last_offset to guess the same as the previous successful 733 * hunk 734 */ 735 const LINENUM oldfirst = pch_first() + last_offset; 736 const LINENUM newfirst = pch_newfirst() + last_offset; 737 const LINENUM oldlast = oldfirst + pch_ptrn_lines() - 1; 738 const LINENUM newlast = newfirst + pch_repl_lines() - 1; 739 const char *stars = (diff_type >= NEW_CONTEXT_DIFF ? " ****" : ""); 740 const char *minuses = (diff_type >= NEW_CONTEXT_DIFF ? " ----" : " -----"); 741 742 fprintf(rejfp, "***************\n"); 743 for (i = 0; i <= pat_end; i++) { 744 switch (pch_char(i)) { 745 case '*': 746 if (oldlast < oldfirst) 747 fprintf(rejfp, "*** 0%s\n", stars); 748 else if (oldlast == oldfirst) 749 fprintf(rejfp, "*** %ld%s\n", oldfirst, stars); 750 else 751 fprintf(rejfp, "*** %ld,%ld%s\n", oldfirst, 752 oldlast, stars); 753 break; 754 case '=': 755 if (newlast < newfirst) 756 fprintf(rejfp, "--- 0%s\n", minuses); 757 else if (newlast == newfirst) 758 fprintf(rejfp, "--- %ld%s\n", newfirst, minuses); 759 else 760 fprintf(rejfp, "--- %ld,%ld%s\n", newfirst, 761 newlast, minuses); 762 break; 763 case '\n': 764 fprintf(rejfp, "%s", pfetch(i)); 765 break; 766 case ' ': 767 case '-': 768 case '+': 769 case '!': 770 fprintf(rejfp, "%c %s", pch_char(i), pfetch(i)); 771 break; 772 default: 773 fatal("fatal internal error in abort_context_hunk\n"); 774 } 775 } 776 } 777 778 static void 779 rej_line(int ch, LINENUM i) 780 { 781 size_t len; 782 const char *line = pfetch(i); 783 784 len = strlen(line); 785 786 fprintf(rejfp, "%c%s", ch, line); 787 if (len == 0 || line[len-1] != '\n') 788 fprintf(rejfp, "\n\\ No newline at end of file\n"); 789 } 790 791 static void 792 abort_hunk(void) 793 { 794 LINENUM i, j, split; 795 int ch1, ch2; 796 const LINENUM pat_end = pch_end(); 797 const LINENUM oldfirst = pch_first() + last_offset; 798 const LINENUM newfirst = pch_newfirst() + last_offset; 799 800 if (diff_type != UNI_DIFF) { 801 abort_context_hunk(); 802 return; 803 } 804 split = -1; 805 for (i = 0; i <= pat_end; i++) { 806 if (pch_char(i) == '=') { 807 split = i; 808 break; 809 } 810 } 811 if (split == -1) { 812 fprintf(rejfp, "malformed hunk: no split found\n"); 813 return; 814 } 815 i = 0; 816 j = split + 1; 817 fprintf(rejfp, "@@ -%ld,%ld +%ld,%ld @@\n", 818 pch_ptrn_lines() ? oldfirst : 0, 819 pch_ptrn_lines(), newfirst, pch_repl_lines()); 820 while (i < split || j <= pat_end) { 821 ch1 = i < split ? pch_char(i) : -1; 822 ch2 = j <= pat_end ? pch_char(j) : -1; 823 if (ch1 == '-') { 824 rej_line('-', i); 825 i++; 826 } else if (ch1 == ' ' && ch2 == ' ') { 827 rej_line(' ', i); 828 i++; 829 j++; 830 } else if (ch1 == '!' && ch2 == '!') { 831 while (i < split && ch1 == '!') { 832 rej_line('-', i); 833 i++; 834 ch1 = i < split ? pch_char(i) : -1; 835 } 836 while (j <= pat_end && ch2 == '!') { 837 rej_line('+', j); 838 j++; 839 ch2 = j <= pat_end ? pch_char(j) : -1; 840 } 841 } else if (ch1 == '*') { 842 i++; 843 } else if (ch2 == '+' || ch2 == ' ') { 844 rej_line(ch2, j); 845 j++; 846 } else { 847 fprintf(rejfp, "internal error on (%ld %ld %ld)\n", 848 i, split, j); 849 rej_line(ch1, i); 850 rej_line(ch2, j); 851 return; 852 } 853 } 854 } 855 856 /* We found where to apply it (we hope), so do it. */ 857 858 static void 859 apply_hunk(LINENUM where) 860 { 861 LINENUM old = 1; 862 const LINENUM lastline = pch_ptrn_lines(); 863 LINENUM new = lastline + 1; 864 #define OUTSIDE 0 865 #define IN_IFNDEF 1 866 #define IN_IFDEF 2 867 #define IN_ELSE 3 868 int def_state = OUTSIDE; 869 const LINENUM pat_end = pch_end(); 870 871 where--; 872 while (pch_char(new) == '=' || pch_char(new) == '\n') 873 new++; 874 875 while (old <= lastline) { 876 if (pch_char(old) == '-') { 877 copy_till(where + old - 1, false); 878 if (do_defines) { 879 if (def_state == OUTSIDE) { 880 fputs(not_defined, ofp); 881 def_state = IN_IFNDEF; 882 } else if (def_state == IN_IFDEF) { 883 fputs(else_defined, ofp); 884 def_state = IN_ELSE; 885 } 886 fputs(pfetch(old), ofp); 887 } 888 last_frozen_line++; 889 old++; 890 } else if (new > pat_end) { 891 break; 892 } else if (pch_char(new) == '+') { 893 copy_till(where + old - 1, false); 894 if (do_defines) { 895 if (def_state == IN_IFNDEF) { 896 fputs(else_defined, ofp); 897 def_state = IN_ELSE; 898 } else if (def_state == OUTSIDE) { 899 fputs(if_defined, ofp); 900 def_state = IN_IFDEF; 901 } 902 } 903 fputs(pfetch(new), ofp); 904 new++; 905 } else if (pch_char(new) != pch_char(old)) { 906 say("Out-of-sync patch, lines %ld,%ld--mangled text or line numbers, maybe?\n", 907 pch_hunk_beg() + old, 908 pch_hunk_beg() + new); 909 #ifdef DEBUGGING 910 say("oldchar = '%c', newchar = '%c'\n", 911 pch_char(old), pch_char(new)); 912 #endif 913 my_exit(2); 914 } else if (pch_char(new) == '!') { 915 copy_till(where + old - 1, false); 916 if (do_defines) { 917 fputs(not_defined, ofp); 918 def_state = IN_IFNDEF; 919 } 920 while (pch_char(old) == '!') { 921 if (do_defines) { 922 fputs(pfetch(old), ofp); 923 } 924 last_frozen_line++; 925 old++; 926 } 927 if (do_defines) { 928 fputs(else_defined, ofp); 929 def_state = IN_ELSE; 930 } 931 while (pch_char(new) == '!') { 932 fputs(pfetch(new), ofp); 933 new++; 934 } 935 } else { 936 if (pch_char(new) != ' ') 937 fatal("Internal error: expected ' '\n"); 938 old++; 939 new++; 940 if (do_defines && def_state != OUTSIDE) { 941 fputs(end_defined, ofp); 942 def_state = OUTSIDE; 943 } 944 } 945 } 946 if (new <= pat_end && pch_char(new) == '+') { 947 copy_till(where + old - 1, false); 948 if (do_defines) { 949 if (def_state == OUTSIDE) { 950 fputs(if_defined, ofp); 951 def_state = IN_IFDEF; 952 } else if (def_state == IN_IFNDEF) { 953 fputs(else_defined, ofp); 954 def_state = IN_ELSE; 955 } 956 } 957 while (new <= pat_end && pch_char(new) == '+') { 958 fputs(pfetch(new), ofp); 959 new++; 960 } 961 } 962 if (do_defines && def_state != OUTSIDE) { 963 fputs(end_defined, ofp); 964 } 965 } 966 967 /* 968 * Open the new file. 969 */ 970 static void 971 init_output(const char *name) 972 { 973 ofp = fopen(name, "w"); 974 if (ofp == NULL) 975 pfatal("can't create %s", name); 976 } 977 978 /* 979 * Open a file to put hunks we can't locate. 980 */ 981 static void 982 init_reject(const char *name) 983 { 984 rejfp = fopen(name, "w"); 985 if (rejfp == NULL) 986 pfatal("can't create %s", name); 987 } 988 989 /* 990 * Copy input file to output, up to wherever hunk is to be applied. 991 * If endoffile is true, treat the last line specially since it may 992 * lack a newline. 993 */ 994 static void 995 copy_till(LINENUM lastline, bool endoffile) 996 { 997 if (last_frozen_line > lastline) 998 fatal("misordered hunks! output would be garbled\n"); 999 while (last_frozen_line < lastline) { 1000 if (++last_frozen_line == lastline && endoffile) 1001 dump_line(last_frozen_line, !last_line_missing_eol); 1002 else 1003 dump_line(last_frozen_line, true); 1004 } 1005 } 1006 1007 /* 1008 * Finish copying the input file to the output file. 1009 */ 1010 static void 1011 spew_output(void) 1012 { 1013 #ifdef DEBUGGING 1014 if (debug & 256) 1015 say("il=%ld lfl=%ld\n", input_lines, last_frozen_line); 1016 #endif 1017 if (input_lines) 1018 copy_till(input_lines, true); /* dump remainder of file */ 1019 fclose(ofp); 1020 ofp = NULL; 1021 } 1022 1023 /* 1024 * Copy one line from input to output. 1025 */ 1026 static void 1027 dump_line(LINENUM line, bool write_newline) 1028 { 1029 char *s; 1030 1031 s = ifetch(line, 0); 1032 if (s == NULL) 1033 return; 1034 /* Note: string is not NUL terminated. */ 1035 for (; *s != '\n'; s++) 1036 putc(*s, ofp); 1037 if (write_newline) 1038 putc('\n', ofp); 1039 } 1040 1041 /* 1042 * Does the patch pattern match at line base+offset? 1043 */ 1044 static bool 1045 patch_match(LINENUM base, LINENUM offset, LINENUM fuzz) 1046 { 1047 LINENUM pline = 1 + fuzz; 1048 LINENUM iline; 1049 LINENUM pat_lines = pch_ptrn_lines() - fuzz; 1050 const char *ilineptr; 1051 const char *plineptr; 1052 ssize_t plinelen; 1053 1054 for (iline = base + offset + fuzz; pline <= pat_lines; pline++, iline++) { 1055 ilineptr = ifetch(iline, offset >= 0); 1056 if (ilineptr == NULL) 1057 return false; 1058 plineptr = pfetch(pline); 1059 plinelen = pch_line_len(pline); 1060 if (canonicalize) { 1061 if (!similar(ilineptr, plineptr, plinelen)) 1062 return false; 1063 } else if (strnNE(ilineptr, plineptr, plinelen)) 1064 return false; 1065 if (iline == input_lines) { 1066 /* 1067 * We are looking at the last line of the file. 1068 * If the file has no eol, the patch line should 1069 * not have one either and vice-versa. Note that 1070 * plinelen > 0. 1071 */ 1072 if (last_line_missing_eol) { 1073 if (plineptr[plinelen - 1] == '\n') 1074 return false; 1075 } else { 1076 if (plineptr[plinelen - 1] != '\n') 1077 return false; 1078 } 1079 } 1080 } 1081 return true; 1082 } 1083 1084 /* 1085 * Do two lines match with canonicalized white space? 1086 */ 1087 static bool 1088 similar(const char *a, const char *b, ssize_t len) 1089 { 1090 while (len) { 1091 if (isspace((unsigned char)*b)) { /* whitespace (or \n) to match? */ 1092 if (!isspace((unsigned char)*a)) 1093 return false; /* no corresponding whitespace */ 1094 while (len && isspace((unsigned char)*b) && *b != '\n') 1095 b++, len--; /* skip pattern whitespace */ 1096 while (isspace((unsigned char)*a) && *a != '\n') 1097 a++; /* skip target whitespace */ 1098 if (*a == '\n' || *b == '\n') 1099 return (*a == *b); /* should end in sync */ 1100 } else if (*a++ != *b++) /* match non-whitespace chars */ 1101 return false; 1102 else 1103 len--; /* probably not necessary */ 1104 } 1105 return true; /* actually, this is not reached */ 1106 /* since there is always a \n */ 1107 } 1108