1 /* $OpenBSD: patch.c,v 1.30 2003/07/28 19:15:34 deraadt 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 #ifndef lint 30 static const char rcsid[] = "$OpenBSD: patch.c,v 1.30 2003/07/28 19:15:34 deraadt Exp $"; 31 #endif /* not lint */ 32 33 #include <sys/types.h> 34 #include <sys/stat.h> 35 #include <unistd.h> 36 37 #include <assert.h> 38 #include <ctype.h> 39 #include <getopt.h> 40 #include <limits.h> 41 #include <stdio.h> 42 #include <string.h> 43 #include <stdlib.h> 44 45 #include "common.h" 46 #include "util.h" 47 #include "pch.h" 48 #include "inp.h" 49 #include "backupfile.h" 50 51 int filemode = 0644; 52 53 char buf[MAXLINELEN]; /* general purpose buffer */ 54 55 bool using_plan_a = TRUE; /* try to keep everything in memory */ 56 bool out_of_mem = FALSE; /* ran out of memory in plan a */ 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 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 88 static void reinitialize_almost_everything(void); 89 static void get_some_switches(void); 90 static LINENUM locate_hunk(LINENUM); 91 static void abort_hunk(void); 92 static void apply_hunk(LINENUM); 93 static void init_output(const char *); 94 static void init_reject(const char *); 95 static void copy_till(LINENUM); 96 static void spew_output(void); 97 static void dump_line(LINENUM); 98 static bool patch_match(LINENUM, LINENUM, LINENUM); 99 static bool similar(const char *, const char *, int); 100 static __dead void usage(void); 101 102 /* TRUE if -E was specified on command line. */ 103 static int remove_empty_files = FALSE; 104 105 /* TRUE if -R was specified on command line. */ 106 static int reverse_flag_specified = FALSE; 107 108 /* buffer holding the name of the rejected patch file. */ 109 static char rejname[NAME_MAX + 1]; 110 111 /* buffer for stderr */ 112 static char serrbuf[BUFSIZ]; 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, patch_seen = 0, i; 147 LINENUM where, newwhere, fuzz, mymaxfuzz; 148 char *tmpdir, *v; 149 150 setbuf(stderr, serrbuf); 151 for (i = 0; i < MAXFILEC; i++) 152 filearg[i] = NULL; 153 154 /* Cons up the names of the temporary files. */ 155 tmpdir = getenv("TMPDIR"); 156 if (tmpdir == NULL) { 157 tmpdir = "/tmp"; 158 } 159 if (asprintf(&TMPOUTNAME, "%s/patchoXXXXXXXXXX", tmpdir) == -1) 160 fatal("cannot allocate memory"); 161 if ((i = mkstemp(TMPOUTNAME)) < 0) 162 pfatal("can't create %s", TMPOUTNAME); 163 close(i); 164 165 if (asprintf(&TMPINNAME, "%s/patchiXXXXXXXXXX", tmpdir) == -1) 166 fatal("cannot allocate memory"); 167 if ((i = mkstemp(TMPINNAME)) < 0) 168 pfatal("can't create %s", TMPINNAME); 169 close(i); 170 171 if (asprintf(&TMPREJNAME, "%s/patchrXXXXXXXXXX", tmpdir) == -1) 172 fatal("cannot allocate memory"); 173 if ((i = mkstemp(TMPREJNAME)) < 0) 174 pfatal("can't create %s", TMPREJNAME); 175 close(i); 176 177 if (asprintf(&TMPPATNAME, "%s/patchpXXXXXXXXXX", tmpdir) == -1) 178 fatal("cannot allocate memory"); 179 if ((i = mkstemp(TMPPATNAME)) < 0) 180 pfatal("can't create %s", TMPPATNAME); 181 close(i); 182 183 v = getenv("SIMPLE_BACKUP_SUFFIX"); 184 if (v) 185 simple_backup_suffix = v; 186 else 187 simple_backup_suffix = ORIGEXT; 188 189 /* parse switches */ 190 Argc = argc; 191 Argv = argv; 192 get_some_switches(); 193 194 if (backup_type == none) { 195 v = getenv("VERSION_CONTROL"); 196 #ifdef notyet 197 if (v != NULL) 198 #endif 199 backup_type = get_version(v); /* OK to pass NULL. */ 200 } 201 202 /* make sure we clean up /tmp in case of disaster */ 203 set_signals(0); 204 205 for (open_patch_file(filearg[1]); there_is_another_patch(); 206 reinitialize_almost_everything()) { 207 /* for each patch in patch file */ 208 209 patch_seen = TRUE; 210 211 if (outname == NULL) 212 outname = savestr(filearg[0]); 213 214 /* for ed script just up and do it and exit */ 215 if (diff_type == ED_DIFF) { 216 do_ed_script(); 217 continue; 218 } 219 /* initialize the patched file */ 220 if (!skip_rest_of_patch) 221 init_output(TMPOUTNAME); 222 223 /* initialize reject file */ 224 init_reject(TMPREJNAME); 225 226 /* find out where all the lines are */ 227 if (!skip_rest_of_patch) 228 scan_input(filearg[0]); 229 230 /* from here on, open no standard i/o files, because malloc */ 231 /* might misfire and we can't catch it easily */ 232 233 /* apply each hunk of patch */ 234 hunk = 0; 235 failed = 0; 236 out_of_mem = FALSE; 237 while (another_hunk()) { 238 hunk++; 239 fuzz = 0; 240 mymaxfuzz = pch_context(); 241 if (maxfuzz < mymaxfuzz) 242 mymaxfuzz = maxfuzz; 243 if (!skip_rest_of_patch) { 244 do { 245 where = locate_hunk(fuzz); 246 if (hunk == 1 && where == 0 && !force) { 247 /* dwim for reversed patch? */ 248 if (!pch_swap()) { 249 if (fuzz == 0) 250 say("Not enough memory to try swapped hunk! Assuming unswapped.\n"); 251 continue; 252 } 253 reverse = !reverse; 254 /* try again */ 255 where = locate_hunk(fuzz); 256 if (where == 0) { 257 /* didn't find it swapped */ 258 if (!pch_swap()) 259 /* put it back to normal */ 260 fatal("lost hunk on alloc error!\n"); 261 reverse = !reverse; 262 } else if (noreverse) { 263 if (!pch_swap()) 264 /* put it back to normal */ 265 fatal("lost hunk on alloc error!\n"); 266 reverse = !reverse; 267 say("Ignoring previously applied (or reversed) patch.\n"); 268 skip_rest_of_patch = TRUE; 269 } else if (batch) { 270 if (verbose) 271 say("%seversed (or previously applied) patch detected! %s -R.", 272 reverse ? "R" : "Unr", 273 reverse ? "Assuming" : "Ignoring"); 274 } else { 275 ask("%seversed (or previously applied) patch detected! %s -R? [y] ", 276 reverse ? "R" : "Unr", 277 reverse ? "Assume" : "Ignore"); 278 if (*buf == 'n') { 279 ask("Apply anyway? [n] "); 280 if (*buf != 'y') 281 skip_rest_of_patch = TRUE; 282 where = 0; 283 reverse = !reverse; 284 if (!pch_swap()) 285 /* put it back to normal */ 286 fatal("lost hunk on alloc error!\n"); 287 } 288 } 289 } 290 } while (!skip_rest_of_patch && where == 0 && 291 ++fuzz <= mymaxfuzz); 292 293 if (skip_rest_of_patch) { /* just got decided */ 294 fclose(ofp); 295 ofp = NULL; 296 } 297 } 298 newwhere = pch_newfirst() + last_offset; 299 if (skip_rest_of_patch) { 300 abort_hunk(); 301 failed++; 302 if (verbose) 303 say("Hunk #%d ignored at %ld.\n", 304 hunk, newwhere); 305 } else if (where == 0) { 306 abort_hunk(); 307 failed++; 308 if (verbose) 309 say("Hunk #%d failed at %ld.\n", 310 hunk, newwhere); 311 } else { 312 apply_hunk(where); 313 if (verbose) { 314 say("Hunk #%d succeeded at %ld", 315 hunk, newwhere); 316 if (fuzz != 0) 317 say(" with fuzz %ld", fuzz); 318 if (last_offset) 319 say(" (offset %ld line%s)", 320 last_offset, 321 last_offset == 1L ? "" : "s"); 322 say(".\n"); 323 } 324 } 325 } 326 327 if (out_of_mem && using_plan_a) { 328 Argc = Argc_last; 329 Argv = Argv_last; 330 say("\n\nRan out of memory using Plan A--trying again...\n\n"); 331 if (ofp) 332 fclose(ofp); 333 ofp = NULL; 334 if (rejfp) 335 fclose(rejfp); 336 rejfp = NULL; 337 continue; 338 } 339 assert(hunk); 340 341 /* finish spewing out the new file */ 342 if (!skip_rest_of_patch) 343 spew_output(); 344 345 /* and put the output where desired */ 346 ignore_signals(); 347 if (!skip_rest_of_patch) { 348 struct stat statbuf; 349 char *realout = outname; 350 351 if (!check_only) { 352 if (move_file(TMPOUTNAME, outname) < 0) { 353 toutkeep = TRUE; 354 realout = TMPOUTNAME; 355 chmod(TMPOUTNAME, filemode); 356 } else 357 chmod(outname, filemode); 358 359 if (remove_empty_files && 360 stat(realout, &statbuf) == 0 && 361 statbuf.st_size == 0) { 362 if (verbose) 363 say("Removing %s (empty after patching).\n", 364 realout); 365 unlink(realout); 366 } 367 } 368 } 369 fclose(rejfp); 370 rejfp = NULL; 371 if (failed) { 372 error = 1; 373 if (*rejname == '\0') { 374 if (strlcpy(rejname, outname, 375 sizeof(rejname)) >= sizeof(rejname)) 376 fatal("filename %s is too long\n", outname); 377 if (strlcat(rejname, REJEXT, 378 sizeof(rejname)) >= sizeof(rejname)) 379 fatal("filename %s is too long\n", outname); 380 } 381 if (skip_rest_of_patch) { 382 say("%d out of %d hunks ignored--saving rejects to %s\n", 383 failed, hunk, rejname); 384 } else { 385 say("%d out of %d hunks failed--saving rejects to %s\n", 386 failed, hunk, rejname); 387 } 388 if (!check_only && move_file(TMPREJNAME, rejname) < 0) 389 trejkeep = TRUE; 390 } 391 set_signals(1); 392 } 393 my_exit(error); 394 /* NOTREACHED */ 395 } 396 397 /* Prepare to find the next patch to do in the patch file. */ 398 399 static void 400 reinitialize_almost_everything(void) 401 { 402 re_patch(); 403 re_input(); 404 405 input_lines = 0; 406 last_frozen_line = 0; 407 408 filec = 0; 409 if (filearg[0] != NULL && !out_of_mem) { 410 free(filearg[0]); 411 filearg[0] = NULL; 412 } 413 if (outname != NULL) { 414 free(outname); 415 outname = NULL; 416 } 417 last_offset = 0; 418 419 diff_type = 0; 420 421 if (revision != NULL) { 422 free(revision); 423 revision = NULL; 424 } 425 reverse = reverse_flag_specified; 426 skip_rest_of_patch = FALSE; 427 428 get_some_switches(); 429 } 430 431 /* Process switches and filenames. */ 432 433 static void 434 get_some_switches(void) 435 { 436 const char *options = "b::B:cCd:D:eEfF:lnNo:p::r:RstuvV:x:z:"; 437 static struct option longopts[] = { 438 {"backup", no_argument, 0, 'b'}, 439 {"batch", no_argument, 0, 't'}, 440 {"check", no_argument, 0, 'C'}, 441 {"context", no_argument, 0, 'c'}, 442 {"debug", required_argument, 0, 'x'}, 443 {"directory", required_argument, 0, 'd'}, 444 {"ed", no_argument, 0, 'e'}, 445 {"force", no_argument, 0, 'f'}, 446 {"forward", no_argument, 0, 'N'}, 447 {"fuzz", required_argument, 0, 'F'}, 448 {"ifdef", required_argument, 0, 'D'}, 449 {"ignore-whitespace", no_argument, 0, 'l'}, 450 {"normal", no_argument, 0, 'n'}, 451 {"output", required_argument, 0, 'o'}, 452 {"prefix", required_argument, 0, 'B'}, 453 {"quiet", no_argument, 0, 's'}, 454 {"reject-file", required_argument, 0, 'r'}, 455 {"remove-empty-files", no_argument, 0, 'E'}, 456 {"reverse", no_argument, 0, 'R'}, 457 {"silent", no_argument, 0, 's'}, 458 {"strip", optional_argument, 0, 'p'}, 459 {"suffix", required_argument, 0, 'z'}, 460 {"unified", no_argument, 0, 'u'}, 461 {"version", no_argument, 0, 'v'}, 462 {"version-control", required_argument, 0, 'V'}, 463 {NULL, 0, 0, 0} 464 }; 465 int ch; 466 467 rejname[0] = '\0'; 468 Argc_last = Argc; 469 Argv_last = Argv; 470 if (!Argc) 471 return; 472 optreset = optind = 1; 473 while ((ch = getopt_long(Argc, Argv, options, longopts, NULL)) != -1) { 474 switch (ch) { 475 case 'b': 476 #ifdef notyet 477 if (backup_type == none) 478 backup_type = numbered_existing; 479 #endif 480 if (optarg == NULL) 481 break; 482 if (verbose) 483 say("Warning, the ``-b suffix'' option has been" 484 " obsoleted by the -z option.\n"); 485 /* FALLTHROUGH */ 486 case 'z': 487 /* must directly follow 'b' case for backwards compat */ 488 simple_backup_suffix = savestr(optarg); 489 break; 490 case 'B': 491 origprae = savestr(optarg); 492 break; 493 case 'c': 494 diff_type = CONTEXT_DIFF; 495 break; 496 case 'C': 497 check_only = TRUE; 498 break; 499 case 'd': 500 if (chdir(optarg) < 0) 501 pfatal("can't cd to %s", optarg); 502 break; 503 case 'D': 504 do_defines = TRUE; 505 if (!isalpha(*optarg) && *optarg != '_') 506 fatal("argument to -D is not an identifier\n"); 507 snprintf(if_defined, sizeof if_defined, 508 "#ifdef %s\n", optarg); 509 snprintf(not_defined, sizeof not_defined, 510 "#ifndef %s\n", optarg); 511 snprintf(end_defined, sizeof end_defined, 512 "#endif /* %s */\n", optarg); 513 break; 514 case 'e': 515 diff_type = ED_DIFF; 516 break; 517 case 'E': 518 remove_empty_files = TRUE; 519 break; 520 case 'f': 521 force = TRUE; 522 break; 523 case 'F': 524 maxfuzz = atoi(optarg); 525 break; 526 case 'l': 527 canonicalize = TRUE; 528 break; 529 case 'n': 530 diff_type = NORMAL_DIFF; 531 break; 532 case 'N': 533 noreverse = TRUE; 534 break; 535 case 'o': 536 outname = savestr(optarg); 537 break; 538 case 'p': 539 strippath = optarg ? atoi(optarg) : 0; 540 break; 541 case 'r': 542 if (strlcpy(rejname, optarg, 543 sizeof(rejname)) >= sizeof(rejname)) 544 fatal("argument for -r is too long\n"); 545 break; 546 case 'R': 547 reverse = TRUE; 548 reverse_flag_specified = TRUE; 549 break; 550 case 's': 551 verbose = FALSE; 552 break; 553 case 't': 554 batch = TRUE; 555 break; 556 case 'u': 557 diff_type = UNI_DIFF; 558 break; 559 case 'v': 560 version(); 561 break; 562 case 'V': 563 backup_type = get_version(optarg); 564 break; 565 #ifdef DEBUGGING 566 case 'x': 567 debug = atoi(optarg); 568 break; 569 #endif 570 default: 571 usage(); 572 break; 573 } 574 } 575 Argc -= optind; 576 Argv += optind; 577 578 while (Argc > 0) { 579 if (filec == MAXFILEC) 580 fatal("too many file arguments\n"); 581 filearg[filec++] = savestr(*Argv++); 582 Argc--; 583 } 584 } 585 586 static __dead void 587 usage(void) 588 { 589 fprintf(stderr, 590 "usage: patch [-bcCeEflnNRstuv] [-B backup-prefix] [-d directory] [-D symbol]\n" 591 " [-Fmax-fuzz] [-o out-file] [-p[strip-count]] [-r rej-name]\n" 592 " [-V {numbered,existing,simple}] [-z backup-ext]\n" 593 " [origfile [patchfile]]\n"); 594 my_exit(EXIT_SUCCESS); 595 } 596 597 /* 598 * Attempt to find the right place to apply this hunk of patch. 599 */ 600 static LINENUM 601 locate_hunk(LINENUM fuzz) 602 { 603 LINENUM first_guess = pch_first() + last_offset; 604 LINENUM offset; 605 LINENUM pat_lines = pch_ptrn_lines(); 606 LINENUM max_pos_offset = input_lines - first_guess - pat_lines + 1; 607 LINENUM max_neg_offset = first_guess - last_frozen_line - 1 + pch_context(); 608 609 if (pat_lines == 0) /* null range matches always */ 610 return first_guess; 611 if (max_neg_offset >= first_guess) /* do not try lines < 0 */ 612 max_neg_offset = first_guess - 1; 613 if (first_guess <= input_lines && patch_match(first_guess, 0, fuzz)) 614 return first_guess; 615 for (offset = 1; ; offset++) { 616 bool check_after = (offset <= max_pos_offset); 617 bool check_before = (offset <= max_neg_offset); 618 619 if (check_after && patch_match(first_guess, offset, fuzz)) { 620 #ifdef DEBUGGING 621 if (debug & 1) 622 say("Offset changing from %ld to %ld\n", 623 last_offset, offset); 624 #endif 625 last_offset = offset; 626 return first_guess + offset; 627 } else if (check_before && patch_match(first_guess, -offset, fuzz)) { 628 #ifdef DEBUGGING 629 if (debug & 1) 630 say("Offset changing from %ld to %ld\n", 631 last_offset, -offset); 632 #endif 633 last_offset = -offset; 634 return first_guess - offset; 635 } else if (!check_before && !check_after) 636 return 0; 637 } 638 } 639 640 /* We did not find the pattern, dump out the hunk so they can handle it. */ 641 642 static void 643 abort_hunk(void) 644 { 645 LINENUM i; 646 const LINENUM pat_end = pch_end(); 647 /* 648 * add in last_offset to guess the same as the previous successful 649 * hunk 650 */ 651 const LINENUM oldfirst = pch_first() + last_offset; 652 const LINENUM newfirst = pch_newfirst() + last_offset; 653 const LINENUM oldlast = oldfirst + pch_ptrn_lines() - 1; 654 const LINENUM newlast = newfirst + pch_repl_lines() - 1; 655 const char *stars = (diff_type >= NEW_CONTEXT_DIFF ? " ****" : ""); 656 const char *minuses = (diff_type >= NEW_CONTEXT_DIFF ? " ----" : " -----"); 657 658 fprintf(rejfp, "***************\n"); 659 for (i = 0; i <= pat_end; i++) { 660 switch (pch_char(i)) { 661 case '*': 662 if (oldlast < oldfirst) 663 fprintf(rejfp, "*** 0%s\n", stars); 664 else if (oldlast == oldfirst) 665 fprintf(rejfp, "*** %ld%s\n", oldfirst, stars); 666 else 667 fprintf(rejfp, "*** %ld,%ld%s\n", oldfirst, 668 oldlast, stars); 669 break; 670 case '=': 671 if (newlast < newfirst) 672 fprintf(rejfp, "--- 0%s\n", minuses); 673 else if (newlast == newfirst) 674 fprintf(rejfp, "--- %ld%s\n", newfirst, minuses); 675 else 676 fprintf(rejfp, "--- %ld,%ld%s\n", newfirst, 677 newlast, minuses); 678 break; 679 case '\n': 680 fprintf(rejfp, "%s", pfetch(i)); 681 break; 682 case ' ': 683 case '-': 684 case '+': 685 case '!': 686 fprintf(rejfp, "%c %s", pch_char(i), pfetch(i)); 687 break; 688 default: 689 fatal("fatal internal error in abort_hunk\n"); 690 } 691 } 692 } 693 694 /* We found where to apply it (we hope), so do it. */ 695 696 static void 697 apply_hunk(LINENUM where) 698 { 699 LINENUM old = 1; 700 const LINENUM lastline = pch_ptrn_lines(); 701 LINENUM new = lastline + 1; 702 #define OUTSIDE 0 703 #define IN_IFNDEF 1 704 #define IN_IFDEF 2 705 #define IN_ELSE 3 706 int def_state = OUTSIDE; 707 const LINENUM pat_end = pch_end(); 708 709 where--; 710 while (pch_char(new) == '=' || pch_char(new) == '\n') 711 new++; 712 713 while (old <= lastline) { 714 if (pch_char(old) == '-') { 715 copy_till(where + old - 1); 716 if (do_defines) { 717 if (def_state == OUTSIDE) { 718 fputs(not_defined, ofp); 719 def_state = IN_IFNDEF; 720 } else if (def_state == IN_IFDEF) { 721 fputs(else_defined, ofp); 722 def_state = IN_ELSE; 723 } 724 fputs(pfetch(old), ofp); 725 } 726 last_frozen_line++; 727 old++; 728 } else if (new > pat_end) { 729 break; 730 } else if (pch_char(new) == '+') { 731 copy_till(where + old - 1); 732 if (do_defines) { 733 if (def_state == IN_IFNDEF) { 734 fputs(else_defined, ofp); 735 def_state = IN_ELSE; 736 } else if (def_state == OUTSIDE) { 737 fputs(if_defined, ofp); 738 def_state = IN_IFDEF; 739 } 740 } 741 fputs(pfetch(new), ofp); 742 new++; 743 } else if (pch_char(new) != pch_char(old)) { 744 say("Out-of-sync patch, lines %ld,%ld--mangled text or line numbers, maybe?\n", 745 pch_hunk_beg() + old, 746 pch_hunk_beg() + new); 747 #ifdef DEBUGGING 748 say("oldchar = '%c', newchar = '%c'\n", 749 pch_char(old), pch_char(new)); 750 #endif 751 my_exit(2); 752 } else if (pch_char(new) == '!') { 753 copy_till(where + old - 1); 754 if (do_defines) { 755 fputs(not_defined, ofp); 756 def_state = IN_IFNDEF; 757 } 758 while (pch_char(old) == '!') { 759 if (do_defines) { 760 fputs(pfetch(old), ofp); 761 } 762 last_frozen_line++; 763 old++; 764 } 765 if (do_defines) { 766 fputs(else_defined, ofp); 767 def_state = IN_ELSE; 768 } 769 while (pch_char(new) == '!') { 770 fputs(pfetch(new), ofp); 771 new++; 772 } 773 } else { 774 assert(pch_char(new) == ' '); 775 old++; 776 new++; 777 if (do_defines && def_state != OUTSIDE) { 778 fputs(end_defined, ofp); 779 def_state = OUTSIDE; 780 } 781 } 782 } 783 if (new <= pat_end && pch_char(new) == '+') { 784 copy_till(where + old - 1); 785 if (do_defines) { 786 if (def_state == OUTSIDE) { 787 fputs(if_defined, ofp); 788 def_state = IN_IFDEF; 789 } else if (def_state == IN_IFNDEF) { 790 fputs(else_defined, ofp); 791 def_state = IN_ELSE; 792 } 793 } 794 while (new <= pat_end && pch_char(new) == '+') { 795 fputs(pfetch(new), ofp); 796 new++; 797 } 798 } 799 if (do_defines && def_state != OUTSIDE) { 800 fputs(end_defined, ofp); 801 } 802 } 803 804 /* 805 * Open the new file. 806 */ 807 static void 808 init_output(const char *name) 809 { 810 ofp = fopen(name, "w"); 811 if (ofp == NULL) 812 pfatal("can't create %s", name); 813 } 814 815 /* 816 * Open a file to put hunks we can't locate. 817 */ 818 static void 819 init_reject(const char *name) 820 { 821 rejfp = fopen(name, "w"); 822 if (rejfp == NULL) 823 pfatal("can't create %s", name); 824 } 825 826 /* 827 * Copy input file to output, up to wherever hunk is to be applied. 828 */ 829 static void 830 copy_till(LINENUM lastline) 831 { 832 if (last_frozen_line > lastline) 833 fatal("misordered hunks! output would be garbled\n"); 834 while (last_frozen_line < lastline) 835 dump_line(++last_frozen_line); 836 } 837 838 /* 839 * Finish copying the input file to the output file. 840 */ 841 static void 842 spew_output(void) 843 { 844 #ifdef DEBUGGING 845 if (debug & 256) 846 say("il=%ld lfl=%ld\n", input_lines, last_frozen_line); 847 #endif 848 if (input_lines) 849 copy_till(input_lines); /* dump remainder of file */ 850 fclose(ofp); 851 ofp = NULL; 852 } 853 854 /* 855 * Copy one line from input to output. 856 */ 857 static void 858 dump_line(LINENUM line) 859 { 860 char *s; 861 862 s = ifetch(line, 0); 863 if (s == NULL) 864 return; 865 /* Note: string is not NUL terminated. */ 866 for (; putc(*s, ofp) != '\n'; s++) 867 ; 868 } 869 870 /* 871 * Does the patch pattern match at line base+offset? 872 */ 873 static bool 874 patch_match(LINENUM base, LINENUM offset, LINENUM fuzz) 875 { 876 LINENUM pline = 1 + fuzz; 877 LINENUM iline; 878 LINENUM pat_lines = pch_ptrn_lines() - fuzz; 879 const char *ilineptr; 880 const char *plineptr; 881 short plinelen; 882 883 for (iline = base + offset + fuzz; pline <= pat_lines; pline++, iline++) { 884 ilineptr = ifetch(iline, offset >= 0); 885 if (ilineptr == NULL) 886 return FALSE; 887 plineptr = pfetch(pline); 888 plinelen = pch_line_len(pline); 889 if (canonicalize) { 890 if (!similar(ilineptr, plineptr, plinelen)) 891 return FALSE; 892 } else if (strnNE(ilineptr, plineptr, plinelen)) 893 return FALSE; 894 } 895 return TRUE; 896 } 897 898 /* 899 * Do two lines match with canonicalized white space? 900 */ 901 static bool 902 similar(const char *a, const char *b, int len) 903 { 904 while (len) { 905 if (isspace(*b)) { /* whitespace (or \n) to match? */ 906 if (!isspace(*a)) /* no corresponding whitespace? */ 907 return FALSE; 908 while (len && isspace(*b) && *b != '\n') 909 b++, len--; /* skip pattern whitespace */ 910 while (isspace(*a) && *a != '\n') 911 a++; /* skip target whitespace */ 912 if (*a == '\n' || *b == '\n') 913 return (*a == *b); /* should end in sync */ 914 } else if (*a++ != *b++) /* match non-whitespace chars */ 915 return FALSE; 916 else 917 len--; /* probably not necessary */ 918 } 919 return TRUE; /* actually, this is not reached */ 920 /* since there is always a \n */ 921 } 922