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 * 28 */ 29 30 #include <sys/types.h> 31 #include <sys/stat.h> 32 33 #include <assert.h> 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 static bool handle_creation(bool, bool *); 107 108 /* true if -E was specified on command line. */ 109 static bool remove_empty_files = false; 110 111 /* true if -R was specified on command line. */ 112 static bool reverse_flag_specified = false; 113 114 static bool Vflag = false; 115 116 /* buffer holding the name of the rejected patch file. */ 117 static char rejname[PATH_MAX]; 118 119 /* how many input lines have been irretractibly output */ 120 static LINENUM last_frozen_line = 0; 121 122 static int Argc; /* guess */ 123 static char **Argv; 124 static int Argc_last; /* for restarting plan_b */ 125 static char **Argv_last; 126 127 static FILE *ofp = NULL; /* output file pointer */ 128 static FILE *rejfp = NULL; /* reject file pointer */ 129 130 static int filec = 0; /* how many file arguments? */ 131 static LINENUM last_offset = 0; 132 static LINENUM maxfuzz = 2; 133 134 /* patch using ifdef, ifndef, etc. */ 135 static bool do_defines = false; 136 /* #ifdef xyzzy */ 137 static char if_defined[128]; 138 /* #ifndef xyzzy */ 139 static char not_defined[128]; 140 /* #else */ 141 static const char else_defined[] = "#else\n"; 142 /* #endif xyzzy */ 143 static char end_defined[128]; 144 145 146 /* Apply a set of diffs as appropriate. */ 147 148 int 149 main(int argc, char *argv[]) 150 { 151 struct stat statbuf; 152 int error = 0, hunk, failed, i, fd; 153 bool out_creating, out_existed, patch_seen, remove_file; 154 bool reverse_seen; 155 LINENUM where = 0, newwhere, fuzz, mymaxfuzz; 156 const char *tmpdir; 157 char *v; 158 159 setvbuf(stdout, NULL, _IOLBF, 0); 160 setvbuf(stderr, NULL, _IOLBF, 0); 161 for (i = 0; i < MAXFILEC; i++) 162 filearg[i] = NULL; 163 164 buf_size = INITLINELEN; 165 buf = malloc((unsigned)(buf_size)); 166 if (buf == NULL) 167 fatal("out of memory\n"); 168 169 /* Cons up the names of the temporary files. */ 170 if ((tmpdir = getenv("TMPDIR")) == NULL || *tmpdir == '\0') 171 tmpdir = _PATH_TMP; 172 for (i = strlen(tmpdir) - 1; i > 0 && tmpdir[i] == '/'; i--) 173 ; 174 i++; 175 if (asprintf(&TMPOUTNAME, "%.*s/patchoXXXXXXXXXX", i, tmpdir) == -1) 176 fatal("cannot allocate memory"); 177 if ((fd = mkstemp(TMPOUTNAME)) < 0) 178 pfatal("can't create %s", TMPOUTNAME); 179 close(fd); 180 181 if (asprintf(&TMPINNAME, "%.*s/patchiXXXXXXXXXX", i, tmpdir) == -1) 182 fatal("cannot allocate memory"); 183 if ((fd = mkstemp(TMPINNAME)) < 0) 184 pfatal("can't create %s", TMPINNAME); 185 close(fd); 186 187 if (asprintf(&TMPREJNAME, "%.*s/patchrXXXXXXXXXX", i, tmpdir) == -1) 188 fatal("cannot allocate memory"); 189 if ((fd = mkstemp(TMPREJNAME)) < 0) 190 pfatal("can't create %s", TMPREJNAME); 191 close(fd); 192 193 if (asprintf(&TMPPATNAME, "%.*s/patchpXXXXXXXXXX", i, tmpdir) == -1) 194 fatal("cannot allocate memory"); 195 if ((fd = mkstemp(TMPPATNAME)) < 0) 196 pfatal("can't create %s", TMPPATNAME); 197 close(fd); 198 199 v = getenv("SIMPLE_BACKUP_SUFFIX"); 200 if (v) 201 simple_backup_suffix = v; 202 else 203 simple_backup_suffix = ORIGEXT; 204 205 /* parse switches */ 206 Argc = argc; 207 Argv = argv; 208 get_some_switches(); 209 210 if (!Vflag) { 211 if ((v = getenv("PATCH_VERSION_CONTROL")) == NULL) 212 v = getenv("VERSION_CONTROL"); 213 if (v != NULL || !posix) 214 backup_type = get_version(v); /* OK to pass NULL. */ 215 } 216 217 /* make sure we clean up /tmp in case of disaster */ 218 set_signals(0); 219 220 patch_seen = false; 221 for (open_patch_file(filearg[1]); there_is_another_patch(); 222 reinitialize_almost_everything()) { 223 /* for each patch in patch file */ 224 225 if (source_file != NULL && (diff_type == CONTEXT_DIFF || 226 diff_type == NEW_CONTEXT_DIFF || 227 diff_type == UNI_DIFF)) 228 out_creating = strcmp(source_file, _PATH_DEVNULL) == 0; 229 else 230 out_creating = false; 231 patch_seen = true; 232 233 warn_on_invalid_line = true; 234 235 if (outname == NULL) 236 outname = xstrdup(filearg[0]); 237 238 /* 239 * At this point, we know if we're supposed to be creating the 240 * file and we know if we should be trying to handle a conflict 241 * between the patch and the file already existing. We defer 242 * handling it until hunk processing because we want to swap 243 * the hunk if they opt to reverse it, but we want to make sure 244 * we *can* swap the hunk without running into memory issues 245 * before we offer it. We also want to be verbose if flags or 246 * user decision cause us to skip -- this is explained a little 247 * more later. 248 */ 249 out_existed = stat(outname, &statbuf) == 0; 250 251 /* for ed script just up and do it and exit */ 252 if (diff_type == ED_DIFF) { 253 do_ed_script(); 254 continue; 255 } 256 /* initialize the patched file */ 257 if (!skip_rest_of_patch) 258 init_output(TMPOUTNAME); 259 260 /* initialize reject file */ 261 init_reject(TMPREJNAME); 262 263 /* find out where all the lines are */ 264 if (!skip_rest_of_patch) 265 scan_input(filearg[0]); 266 267 /* 268 * from here on, open no standard i/o files, because 269 * malloc might misfire and we can't catch it easily 270 */ 271 272 /* apply each hunk of patch */ 273 hunk = 0; 274 failed = 0; 275 reverse_seen = false; 276 out_of_mem = false; 277 remove_file = false; 278 while (another_hunk()) { 279 assert(!out_creating || hunk == 0); 280 hunk++; 281 fuzz = 0; 282 283 /* 284 * There are only three cases in handle_creation() that 285 * results in us skipping hunk location, in order: 286 * 287 * 1.) Potentially reversed but -f/--force'd, 288 * 2.) Potentially reversed but -N/--forward'd 289 * 3.) Reversed and the user's opted to not apply it. 290 * 291 * In all three cases, we still want to inform the user 292 * that we're ignoring it in the standard way, which is 293 * also tied to this hunk processing loop. 294 */ 295 if (out_creating) 296 reverse_seen = handle_creation(out_existed, 297 &remove_file); 298 299 mymaxfuzz = pch_context(); 300 if (maxfuzz < mymaxfuzz) 301 mymaxfuzz = maxfuzz; 302 if (!skip_rest_of_patch) { 303 do { 304 where = locate_hunk(fuzz); 305 if (hunk == 1 && where == 0 && !force && !reverse_seen) { 306 /* dwim for reversed patch? */ 307 if (!pch_swap()) { 308 if (fuzz == 0) 309 say("Not enough memory to try swapped hunk! Assuming unswapped.\n"); 310 continue; 311 } 312 reverse = !reverse; 313 /* try again */ 314 where = locate_hunk(fuzz); 315 if (where == 0) { 316 /* didn't find it swapped */ 317 if (!pch_swap()) 318 /* put it back to normal */ 319 fatal("lost hunk on alloc error!\n"); 320 reverse = !reverse; 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 else 342 reverse_seen = true; 343 where = 0; 344 reverse = !reverse; 345 if (!pch_swap()) 346 /* put it back to normal */ 347 fatal("lost hunk on alloc error!\n"); 348 } 349 } 350 } 351 } while (!skip_rest_of_patch && where == 0 && 352 ++fuzz <= mymaxfuzz); 353 354 if (skip_rest_of_patch) { /* just got decided */ 355 if (ferror(ofp) || fclose(ofp)) { 356 say("Error writing %s\n", 357 TMPOUTNAME); 358 error = 1; 359 } 360 ofp = NULL; 361 } 362 } 363 newwhere = pch_newfirst() + last_offset; 364 if (skip_rest_of_patch) { 365 abort_hunk(); 366 failed++; 367 if (verbose) 368 say("Hunk #%d ignored at %ld.\n", 369 hunk, newwhere); 370 } else if (where == 0) { 371 abort_hunk(); 372 failed++; 373 if (verbose) 374 say("Hunk #%d failed at %ld.\n", 375 hunk, newwhere); 376 } else { 377 apply_hunk(where); 378 if (verbose) { 379 say("Hunk #%d succeeded at %ld", 380 hunk, newwhere); 381 if (fuzz != 0) 382 say(" with fuzz %ld", fuzz); 383 if (last_offset) 384 say(" (offset %ld line%s)", 385 last_offset, 386 last_offset == 1L ? "" : "s"); 387 say(".\n"); 388 } 389 } 390 } 391 392 if (out_of_mem && using_plan_a) { 393 Argc = Argc_last; 394 Argv = Argv_last; 395 say("\n\nRan out of memory using Plan A--trying again...\n\n"); 396 if (ofp) 397 fclose(ofp); 398 ofp = NULL; 399 if (rejfp) 400 fclose(rejfp); 401 rejfp = NULL; 402 continue; 403 } 404 if (hunk == 0) 405 fatal("Internal error: hunk should not be 0\n"); 406 407 /* finish spewing out the new file */ 408 if (!skip_rest_of_patch && !spew_output()) { 409 say("Can't write %s\n", TMPOUTNAME); 410 error = 1; 411 } 412 413 /* and put the output where desired */ 414 ignore_signals(); 415 if (!skip_rest_of_patch) { 416 char *realout = outname; 417 418 if (!check_only) { 419 if (move_file(TMPOUTNAME, outname) < 0) { 420 toutkeep = true; 421 realout = TMPOUTNAME; 422 chmod(TMPOUTNAME, filemode); 423 } else 424 chmod(outname, filemode); 425 426 /* 427 * remove_file is a per-patch flag indicating 428 * whether it's OK to remove the empty file. 429 * This is specifically set when we're reversing 430 * the creation of a file and it ends up empty. 431 * This is an exception to the global policy 432 * (remove_empty_files) because the user would 433 * likely not expect the reverse of file 434 * creation to leave an empty file laying 435 * around. 436 */ 437 if ((remove_empty_files || remove_file) && 438 stat(realout, &statbuf) == 0 && 439 statbuf.st_size == 0) { 440 if (verbose) 441 say("Removing %s (empty after patching).\n", 442 realout); 443 unlink(realout); 444 } 445 } 446 } 447 if (ferror(rejfp) || fclose(rejfp)) { 448 say("Error writing %s\n", rejname); 449 error = 1; 450 } 451 rejfp = NULL; 452 if (failed) { 453 error = 1; 454 if (*rejname == '\0') { 455 if (strlcpy(rejname, outname, 456 sizeof(rejname)) >= sizeof(rejname)) 457 fatal("filename %s is too long\n", outname); 458 if (strlcat(rejname, REJEXT, 459 sizeof(rejname)) >= sizeof(rejname)) 460 fatal("filename %s is too long\n", outname); 461 } 462 if (!check_only) 463 say("%d out of %d hunks %s--saving rejects to %s\n", 464 failed, hunk, skip_rest_of_patch ? "ignored" : "failed", rejname); 465 else if (filearg[0] != NULL) 466 say("%d out of %d hunks %s while patching %s\n", 467 failed, hunk, skip_rest_of_patch ? "ignored" : "failed", filearg[0]); 468 else 469 /* File prompt ignored, just note # hunks. */ 470 say("%d out of %d hunks %s\n", 471 failed, hunk, skip_rest_of_patch ? "ignored" : "failed"); 472 if (!check_only && move_file(TMPREJNAME, rejname) < 0) 473 trejkeep = true; 474 } 475 set_signals(1); 476 } 477 478 if (!patch_seen && nonempty_patchf_seen) 479 error = 2; 480 481 my_exit(error); 482 /* NOTREACHED */ 483 } 484 485 /* Prepare to find the next patch to do in the patch file. */ 486 487 static void 488 reinitialize_almost_everything(void) 489 { 490 re_patch(); 491 re_input(); 492 493 input_lines = 0; 494 last_frozen_line = 0; 495 496 filec = 0; 497 if (!out_of_mem) { 498 free(filearg[0]); 499 filearg[0] = NULL; 500 } 501 502 free(source_file); 503 source_file = NULL; 504 505 free(outname); 506 outname = NULL; 507 508 last_offset = 0; 509 diff_type = 0; 510 511 free(revision); 512 revision = NULL; 513 514 reverse = reverse_flag_specified; 515 skip_rest_of_patch = false; 516 517 get_some_switches(); 518 } 519 520 /* Process switches and filenames. */ 521 522 static void 523 get_some_switches(void) 524 { 525 const char *options = "b::B:cCd:D:eEfF:i:lnNo:p:r:RstuvV:x:z:"; 526 static struct option longopts[] = { 527 {"backup", no_argument, 0, 'b'}, 528 {"batch", no_argument, 0, 't'}, 529 {"check", no_argument, 0, 'C'}, 530 {"context", no_argument, 0, 'c'}, 531 {"debug", required_argument, 0, 'x'}, 532 {"directory", required_argument, 0, 'd'}, 533 {"dry-run", no_argument, 0, 'C'}, 534 {"ed", no_argument, 0, 'e'}, 535 {"force", no_argument, 0, 'f'}, 536 {"forward", no_argument, 0, 'N'}, 537 {"fuzz", required_argument, 0, 'F'}, 538 {"ifdef", required_argument, 0, 'D'}, 539 {"input", required_argument, 0, 'i'}, 540 {"ignore-whitespace", no_argument, 0, 'l'}, 541 {"normal", no_argument, 0, 'n'}, 542 {"output", required_argument, 0, 'o'}, 543 {"prefix", required_argument, 0, 'B'}, 544 {"quiet", no_argument, 0, 's'}, 545 {"reject-file", required_argument, 0, 'r'}, 546 {"remove-empty-files", no_argument, 0, 'E'}, 547 {"reverse", no_argument, 0, 'R'}, 548 {"silent", no_argument, 0, 's'}, 549 {"strip", required_argument, 0, 'p'}, 550 {"suffix", required_argument, 0, 'z'}, 551 {"unified", no_argument, 0, 'u'}, 552 {"version", no_argument, 0, 'v'}, 553 {"version-control", required_argument, 0, 'V'}, 554 {"posix", no_argument, &posix, 1}, 555 {NULL, 0, 0, 0} 556 }; 557 int ch; 558 559 rejname[0] = '\0'; 560 Argc_last = Argc; 561 Argv_last = Argv; 562 if (!Argc) 563 return; 564 optreset = optind = 1; 565 while ((ch = getopt_long(Argc, Argv, options, longopts, NULL)) != -1) { 566 switch (ch) { 567 case 'b': 568 if (backup_type == none) 569 backup_type = numbered_existing; 570 if (optarg == NULL) 571 break; 572 if (verbose) 573 say("Warning, the ``-b suffix'' option has been" 574 " obsoleted by the -z option.\n"); 575 /* FALLTHROUGH */ 576 case 'z': 577 /* must directly follow 'b' case for backwards compat */ 578 simple_backup_suffix = xstrdup(optarg); 579 break; 580 case 'B': 581 origprae = xstrdup(optarg); 582 break; 583 case 'c': 584 diff_type = CONTEXT_DIFF; 585 break; 586 case 'C': 587 check_only = true; 588 break; 589 case 'd': 590 if (chdir(optarg) < 0) 591 pfatal("can't cd to %s", optarg); 592 break; 593 case 'D': 594 do_defines = true; 595 if (!isalpha((unsigned char)*optarg) && *optarg != '_') 596 fatal("argument to -D is not an identifier\n"); 597 snprintf(if_defined, sizeof if_defined, 598 "#ifdef %s\n", optarg); 599 snprintf(not_defined, sizeof not_defined, 600 "#ifndef %s\n", optarg); 601 snprintf(end_defined, sizeof end_defined, 602 "#endif /* %s */\n", optarg); 603 break; 604 case 'e': 605 diff_type = ED_DIFF; 606 break; 607 case 'E': 608 remove_empty_files = true; 609 break; 610 case 'f': 611 force = true; 612 break; 613 case 'F': 614 maxfuzz = atoi(optarg); 615 break; 616 case 'i': 617 if (++filec == MAXFILEC) 618 fatal("too many file arguments\n"); 619 filearg[filec] = xstrdup(optarg); 620 break; 621 case 'l': 622 canonicalize = true; 623 break; 624 case 'n': 625 diff_type = NORMAL_DIFF; 626 break; 627 case 'N': 628 noreverse = true; 629 break; 630 case 'o': 631 outname = xstrdup(optarg); 632 break; 633 case 'p': 634 strippath = atoi(optarg); 635 break; 636 case 'r': 637 if (strlcpy(rejname, optarg, 638 sizeof(rejname)) >= sizeof(rejname)) 639 fatal("argument for -r is too long\n"); 640 break; 641 case 'R': 642 reverse = true; 643 reverse_flag_specified = true; 644 break; 645 case 's': 646 verbose = false; 647 break; 648 case 't': 649 batch = true; 650 break; 651 case 'u': 652 diff_type = UNI_DIFF; 653 break; 654 case 'v': 655 version(); 656 break; 657 case 'V': 658 backup_type = get_version(optarg); 659 Vflag = true; 660 break; 661 #ifdef DEBUGGING 662 case 'x': 663 debug = atoi(optarg); 664 break; 665 #endif 666 default: 667 if (ch != '\0') 668 usage(); 669 break; 670 } 671 } 672 Argc -= optind; 673 Argv += optind; 674 675 if (Argc > 0) { 676 filearg[0] = xstrdup(*Argv++); 677 Argc--; 678 while (Argc > 0) { 679 if (++filec == MAXFILEC) 680 fatal("too many file arguments\n"); 681 filearg[filec] = xstrdup(*Argv++); 682 Argc--; 683 } 684 } 685 686 if (getenv("POSIXLY_CORRECT") != NULL) 687 posix = 1; 688 } 689 690 static void 691 usage(void) 692 { 693 fprintf(stderr, 694 "usage: patch [-bCcEeflNnRstuv] [-B backup-prefix] [-D symbol] [-d directory]\n" 695 " [-F max-fuzz] [-i patchfile] [-o out-file] [-p strip-count]\n" 696 " [-r rej-name] [-V t | nil | never | none] [-x number]\n" 697 " [-z backup-ext] [--posix] [origfile [patchfile]]\n" 698 " patch <patchfile\n"); 699 my_exit(EXIT_FAILURE); 700 } 701 702 /* 703 * Attempt to find the right place to apply this hunk of patch. 704 */ 705 static LINENUM 706 locate_hunk(LINENUM fuzz) 707 { 708 LINENUM first_guess = pch_first() + last_offset; 709 LINENUM offset; 710 LINENUM pat_lines = pch_ptrn_lines(); 711 LINENUM max_pos_offset = input_lines - first_guess - pat_lines + 1; 712 LINENUM max_neg_offset = first_guess - last_frozen_line - 1 + pch_context(); 713 714 if (pat_lines == 0) { /* null range matches always */ 715 if (verbose && fuzz == 0 && (diff_type == CONTEXT_DIFF 716 || diff_type == NEW_CONTEXT_DIFF 717 || diff_type == UNI_DIFF)) { 718 say("Empty context always matches.\n"); 719 } 720 if (first_guess == 0) /* empty file */ 721 return 1; 722 return (first_guess); 723 } 724 if (max_neg_offset >= first_guess) /* do not try lines < 0 */ 725 max_neg_offset = first_guess - 1; 726 if (first_guess <= input_lines && patch_match(first_guess, 0, fuzz)) 727 return first_guess; 728 for (offset = 1; ; offset++) { 729 bool check_after = (offset <= max_pos_offset); 730 bool check_before = (offset <= max_neg_offset); 731 732 if (check_after && patch_match(first_guess, offset, fuzz)) { 733 #ifdef DEBUGGING 734 if (debug & 1) 735 say("Offset changing from %ld to %ld\n", 736 last_offset, offset); 737 #endif 738 last_offset = offset; 739 return first_guess + offset; 740 } else if (check_before && patch_match(first_guess, -offset, fuzz)) { 741 #ifdef DEBUGGING 742 if (debug & 1) 743 say("Offset changing from %ld to %ld\n", 744 last_offset, -offset); 745 #endif 746 last_offset = -offset; 747 return first_guess - offset; 748 } else if (!check_before && !check_after) 749 return 0; 750 } 751 } 752 753 /* We did not find the pattern, dump out the hunk so they can handle it. */ 754 755 static void 756 abort_context_hunk(void) 757 { 758 LINENUM i; 759 const LINENUM pat_end = pch_end(); 760 /* 761 * add in last_offset to guess the same as the previous successful 762 * hunk 763 */ 764 const LINENUM oldfirst = pch_first() + last_offset; 765 const LINENUM newfirst = pch_newfirst() + last_offset; 766 const LINENUM oldlast = oldfirst + pch_ptrn_lines() - 1; 767 const LINENUM newlast = newfirst + pch_repl_lines() - 1; 768 const char *stars = (diff_type >= NEW_CONTEXT_DIFF ? " ****" : ""); 769 const char *minuses = (diff_type >= NEW_CONTEXT_DIFF ? " ----" : " -----"); 770 771 fprintf(rejfp, "***************\n"); 772 for (i = 0; i <= pat_end; i++) { 773 switch (pch_char(i)) { 774 case '*': 775 if (oldlast < oldfirst) 776 fprintf(rejfp, "*** 0%s\n", stars); 777 else if (oldlast == oldfirst) 778 fprintf(rejfp, "*** %ld%s\n", oldfirst, stars); 779 else 780 fprintf(rejfp, "*** %ld,%ld%s\n", oldfirst, 781 oldlast, stars); 782 break; 783 case '=': 784 if (newlast < newfirst) 785 fprintf(rejfp, "--- 0%s\n", minuses); 786 else if (newlast == newfirst) 787 fprintf(rejfp, "--- %ld%s\n", newfirst, minuses); 788 else 789 fprintf(rejfp, "--- %ld,%ld%s\n", newfirst, 790 newlast, minuses); 791 break; 792 case '\n': 793 fprintf(rejfp, "%s", pfetch(i)); 794 break; 795 case ' ': 796 case '-': 797 case '+': 798 case '!': 799 fprintf(rejfp, "%c %s", pch_char(i), pfetch(i)); 800 break; 801 default: 802 fatal("fatal internal error in abort_context_hunk\n"); 803 } 804 } 805 } 806 807 static void 808 rej_line(int ch, LINENUM i) 809 { 810 size_t len; 811 const char *line = pfetch(i); 812 813 len = strlen(line); 814 815 fprintf(rejfp, "%c%s", ch, line); 816 if (len == 0 || line[len - 1] != '\n') { 817 if (len >= USHRT_MAX) 818 fprintf(rejfp, "\n\\ Line too long\n"); 819 else 820 fprintf(rejfp, "\n\\ No newline at end of line\n"); 821 } 822 } 823 824 static void 825 abort_hunk(void) 826 { 827 LINENUM i, j, split; 828 int ch1, ch2; 829 const LINENUM pat_end = pch_end(); 830 const LINENUM oldfirst = pch_first() + last_offset; 831 const LINENUM newfirst = pch_newfirst() + last_offset; 832 833 if (diff_type != UNI_DIFF) { 834 abort_context_hunk(); 835 return; 836 } 837 split = -1; 838 for (i = 0; i <= pat_end; i++) { 839 if (pch_char(i) == '=') { 840 split = i; 841 break; 842 } 843 } 844 if (split == -1) { 845 fprintf(rejfp, "malformed hunk: no split found\n"); 846 return; 847 } 848 i = 0; 849 j = split + 1; 850 fprintf(rejfp, "@@ -%ld,%ld +%ld,%ld @@\n", 851 pch_ptrn_lines() ? oldfirst : 0, 852 pch_ptrn_lines(), newfirst, pch_repl_lines()); 853 while (i < split || j <= pat_end) { 854 ch1 = i < split ? pch_char(i) : -1; 855 ch2 = j <= pat_end ? pch_char(j) : -1; 856 if (ch1 == '-') { 857 rej_line('-', i); 858 i++; 859 } else if (ch1 == ' ' && ch2 == ' ') { 860 rej_line(' ', i); 861 i++; 862 j++; 863 } else if (ch1 == '!' && ch2 == '!') { 864 while (i < split && ch1 == '!') { 865 rej_line('-', i); 866 i++; 867 ch1 = i < split ? pch_char(i) : -1; 868 } 869 while (j <= pat_end && ch2 == '!') { 870 rej_line('+', j); 871 j++; 872 ch2 = j <= pat_end ? pch_char(j) : -1; 873 } 874 } else if (ch1 == '*') { 875 i++; 876 } else if (ch2 == '+' || ch2 == ' ') { 877 rej_line(ch2, j); 878 j++; 879 } else { 880 fprintf(rejfp, "internal error on (%ld %ld %ld)\n", 881 i, split, j); 882 rej_line(ch1, i); 883 rej_line(ch2, j); 884 return; 885 } 886 } 887 } 888 889 /* We found where to apply it (we hope), so do it. */ 890 891 static void 892 apply_hunk(LINENUM where) 893 { 894 LINENUM old = 1; 895 const LINENUM lastline = pch_ptrn_lines(); 896 LINENUM new = lastline + 1; 897 #define OUTSIDE 0 898 #define IN_IFNDEF 1 899 #define IN_IFDEF 2 900 #define IN_ELSE 3 901 int def_state = OUTSIDE; 902 const LINENUM pat_end = pch_end(); 903 904 where--; 905 while (pch_char(new) == '=' || pch_char(new) == '\n') 906 new++; 907 908 while (old <= lastline) { 909 if (pch_char(old) == '-') { 910 copy_till(where + old - 1, false); 911 if (do_defines) { 912 if (def_state == OUTSIDE) { 913 fputs(not_defined, ofp); 914 def_state = IN_IFNDEF; 915 } else if (def_state == IN_IFDEF) { 916 fputs(else_defined, ofp); 917 def_state = IN_ELSE; 918 } 919 fputs(pfetch(old), ofp); 920 } 921 last_frozen_line++; 922 old++; 923 } else if (new > pat_end) { 924 break; 925 } else if (pch_char(new) == '+') { 926 copy_till(where + old - 1, false); 927 if (do_defines) { 928 if (def_state == IN_IFNDEF) { 929 fputs(else_defined, ofp); 930 def_state = IN_ELSE; 931 } else if (def_state == OUTSIDE) { 932 fputs(if_defined, ofp); 933 def_state = IN_IFDEF; 934 } 935 } 936 fputs(pfetch(new), ofp); 937 new++; 938 } else if (pch_char(new) != pch_char(old)) { 939 say("Out-of-sync patch, lines %ld,%ld--mangled text or line numbers, maybe?\n", 940 pch_hunk_beg() + old, 941 pch_hunk_beg() + new); 942 #ifdef DEBUGGING 943 say("oldchar = '%c', newchar = '%c'\n", 944 pch_char(old), pch_char(new)); 945 #endif 946 my_exit(2); 947 } else if (pch_char(new) == '!') { 948 copy_till(where + old - 1, false); 949 if (do_defines) { 950 fputs(not_defined, ofp); 951 def_state = IN_IFNDEF; 952 } 953 while (pch_char(old) == '!') { 954 if (do_defines) { 955 fputs(pfetch(old), ofp); 956 } 957 last_frozen_line++; 958 old++; 959 } 960 if (do_defines) { 961 fputs(else_defined, ofp); 962 def_state = IN_ELSE; 963 } 964 while (pch_char(new) == '!') { 965 fputs(pfetch(new), ofp); 966 new++; 967 } 968 } else { 969 if (pch_char(new) != ' ') 970 fatal("Internal error: expected ' '\n"); 971 old++; 972 new++; 973 if (do_defines && def_state != OUTSIDE) { 974 fputs(end_defined, ofp); 975 def_state = OUTSIDE; 976 } 977 } 978 } 979 if (new <= pat_end && pch_char(new) == '+') { 980 copy_till(where + old - 1, false); 981 if (do_defines) { 982 if (def_state == OUTSIDE) { 983 fputs(if_defined, ofp); 984 def_state = IN_IFDEF; 985 } else if (def_state == IN_IFNDEF) { 986 fputs(else_defined, ofp); 987 def_state = IN_ELSE; 988 } 989 } 990 while (new <= pat_end && pch_char(new) == '+') { 991 fputs(pfetch(new), ofp); 992 new++; 993 } 994 } 995 if (do_defines && def_state != OUTSIDE) { 996 fputs(end_defined, ofp); 997 } 998 } 999 1000 /* 1001 * Open the new file. 1002 */ 1003 static void 1004 init_output(const char *name) 1005 { 1006 ofp = fopen(name, "w"); 1007 if (ofp == NULL) 1008 pfatal("can't create %s", name); 1009 } 1010 1011 /* 1012 * Open a file to put hunks we can't locate. 1013 */ 1014 static void 1015 init_reject(const char *name) 1016 { 1017 rejfp = fopen(name, "w"); 1018 if (rejfp == NULL) 1019 pfatal("can't create %s", name); 1020 } 1021 1022 /* 1023 * Copy input file to output, up to wherever hunk is to be applied. 1024 * If endoffile is true, treat the last line specially since it may 1025 * lack a newline. 1026 */ 1027 static void 1028 copy_till(LINENUM lastline, bool endoffile) 1029 { 1030 if (last_frozen_line > lastline) 1031 fatal("misordered hunks! output would be garbled\n"); 1032 while (last_frozen_line < lastline) { 1033 if (++last_frozen_line == lastline && endoffile) 1034 dump_line(last_frozen_line, !last_line_missing_eol); 1035 else 1036 dump_line(last_frozen_line, true); 1037 } 1038 } 1039 1040 /* 1041 * Finish copying the input file to the output file. 1042 */ 1043 static bool 1044 spew_output(void) 1045 { 1046 int rv; 1047 1048 #ifdef DEBUGGING 1049 if (debug & 256) 1050 say("il=%ld lfl=%ld\n", input_lines, last_frozen_line); 1051 #endif 1052 if (input_lines) 1053 copy_till(input_lines, true); /* dump remainder of file */ 1054 rv = ferror(ofp) == 0 && fclose(ofp) == 0; 1055 ofp = NULL; 1056 return rv; 1057 } 1058 1059 /* 1060 * Copy one line from input to output. 1061 */ 1062 static void 1063 dump_line(LINENUM line, bool write_newline) 1064 { 1065 char *s; 1066 1067 s = ifetch(line, 0); 1068 if (s == NULL) 1069 return; 1070 /* Note: string is not NUL terminated. */ 1071 for (; *s != '\n'; s++) 1072 putc(*s, ofp); 1073 if (write_newline) 1074 putc('\n', ofp); 1075 } 1076 1077 /* 1078 * Does the patch pattern match at line base+offset? 1079 */ 1080 static bool 1081 patch_match(LINENUM base, LINENUM offset, LINENUM fuzz) 1082 { 1083 LINENUM pline = 1 + fuzz; 1084 LINENUM iline; 1085 LINENUM pat_lines = pch_ptrn_lines() - fuzz; 1086 const char *ilineptr; 1087 const char *plineptr; 1088 unsigned short plinelen; 1089 1090 /* Patch does not match if we don't have any more context to use */ 1091 if (pline > pat_lines) 1092 return false; 1093 for (iline = base + offset + fuzz; pline <= pat_lines; pline++, iline++) { 1094 ilineptr = ifetch(iline, offset >= 0); 1095 if (ilineptr == NULL) 1096 return false; 1097 plineptr = pfetch(pline); 1098 plinelen = pch_line_len(pline); 1099 if (canonicalize) { 1100 if (!similar(ilineptr, plineptr, plinelen)) 1101 return false; 1102 } else if (strnNE(ilineptr, plineptr, plinelen)) 1103 return false; 1104 if (iline == input_lines) { 1105 /* 1106 * We are looking at the last line of the file. 1107 * If the file has no eol, the patch line should 1108 * not have one either and vice-versa. Note that 1109 * plinelen > 0. 1110 */ 1111 if (last_line_missing_eol) { 1112 if (plineptr[plinelen - 1] == '\n') 1113 return false; 1114 } else { 1115 if (plineptr[plinelen - 1] != '\n') 1116 return false; 1117 } 1118 } 1119 } 1120 return true; 1121 } 1122 1123 /* 1124 * Do two lines match with canonicalized white space? 1125 */ 1126 static bool 1127 similar(const char *a, const char *b, int len) 1128 { 1129 while (len) { 1130 if (isspace((unsigned char)*b)) { /* whitespace (or \n) to match? */ 1131 if (!isspace((unsigned char)*a)) /* no corresponding whitespace? */ 1132 return false; 1133 while (len && isspace((unsigned char)*b) && *b != '\n') 1134 b++, len--; /* skip pattern whitespace */ 1135 while (isspace((unsigned char)*a) && *a != '\n') 1136 a++; /* skip target whitespace */ 1137 if (*a == '\n' || *b == '\n') 1138 return (*a == *b); /* should end in sync */ 1139 } else if (*a++ != *b++) /* match non-whitespace chars */ 1140 return false; 1141 else 1142 len--; /* probably not necessary */ 1143 } 1144 return true; /* actually, this is not reached */ 1145 /* since there is always a \n */ 1146 } 1147 1148 static bool 1149 handle_creation(bool out_existed, bool *remove) 1150 { 1151 bool reverse_seen; 1152 1153 reverse_seen = false; 1154 if (reverse && out_existed) { 1155 /* 1156 * If the patch creates the file and we're reversing the patch, 1157 * then we need to indicate to the patch processor that it's OK 1158 * to remove this file. 1159 */ 1160 *remove = true; 1161 } else if (!reverse && out_existed) { 1162 /* 1163 * Otherwise, we need to blow the horn because the patch appears 1164 * to be reversed/already applied. For non-batch jobs, we'll 1165 * prompt to figure out what we should be trying to do to raise 1166 * awareness of the issue. batch (-t) processing suppresses the 1167 * questions and just assumes that we're reversed if it looks 1168 * like we are, which is always the case if we've reached this 1169 * branch. 1170 */ 1171 if (force) { 1172 skip_rest_of_patch = true; 1173 return (false); 1174 } 1175 if (noreverse) { 1176 /* If -N is supplied, however, we bail out/ignore. */ 1177 say("Ignoring previously applied (or reversed) patch.\n"); 1178 skip_rest_of_patch = true; 1179 return (false); 1180 } 1181 1182 /* Unreversed... suspicious if the file existed. */ 1183 if (!pch_swap()) 1184 fatal("lost hunk on alloc error!\n"); 1185 1186 reverse = !reverse; 1187 1188 if (batch) { 1189 if (verbose) 1190 say("Patch creates file that already exists, %s %seversed", 1191 reverse ? "Assuming" : "Ignoring", 1192 reverse ? "R" : "Unr"); 1193 } else { 1194 ask("Patch creates file that already exists! %s -R? [y] ", 1195 reverse ? "Assume" : "Ignore"); 1196 1197 if (*buf == 'n') { 1198 ask("Apply anyway? [n]"); 1199 if (*buf != 'y') 1200 /* Don't apply; error out. */ 1201 skip_rest_of_patch = true; 1202 else 1203 /* Attempt to apply. */ 1204 reverse_seen = true; 1205 reverse = !reverse; 1206 if (!pch_swap()) 1207 fatal("lost hunk on alloc error!\n"); 1208 } else { 1209 /* 1210 * They've opted to assume -R; effectively the 1211 * same as the first branch in this function, 1212 * but the decision is here rather than in a 1213 * prior patch/hunk as in that branch. 1214 */ 1215 *remove = true; 1216 } 1217 } 1218 } 1219 1220 /* 1221 * The return value indicates if we offered a chance to reverse but the 1222 * user declined. This keeps the main patch processor in the loop since 1223 * we've taken this out of the normal flow of hunk processing to 1224 * simplify logic a little bit. 1225 */ 1226 return (reverse_seen); 1227 } 1228