1 /* 2 * $OpenBSD: patch.c,v 1.41 2004/07/09 19:13:46 otto Exp $ 3 * $DragonFly: src/usr.bin/patch/patch.c,v 1.2 2004/10/02 05:52:06 dillon Exp $ 4 */ 5 6 /* 7 * patch - a program to apply diffs to original files 8 * 9 * Copyright 1986, Larry Wall 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following condition is met: 13 * 1. Redistributions of source code must retain the above copyright notice, 14 * this condition and the following disclaimer. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY 17 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 18 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 19 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR 20 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 22 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 23 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 * 28 * -C option added in 1998, original code by Marc Espie, based on FreeBSD 29 * behaviour 30 */ 31 32 #include <sys/types.h> 33 #include <sys/stat.h> 34 #include <unistd.h> 35 36 #include <ctype.h> 37 #include <getopt.h> 38 #include <limits.h> 39 #include <stdio.h> 40 #include <string.h> 41 #include <stdlib.h> 42 43 #include "common.h" 44 #include "util.h" 45 #include "pch.h" 46 #include "inp.h" 47 #include "backupfile.h" 48 #include "pathnames.h" 49 50 int filemode = 0644; 51 52 char buf[MAXLINELEN]; /* 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 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_hunk(void); 94 static void apply_hunk(LINENUM); 95 static void init_output(const char *); 96 static void init_reject(const char *); 97 static void copy_till(LINENUM, bool); 98 static void spew_output(void); 99 static void dump_line(LINENUM, bool); 100 static bool patch_match(LINENUM, LINENUM, LINENUM); 101 static bool similar(const char *, const char *, int); 102 static void usage(void); 103 104 /* true if -E was specified on command line. */ 105 static bool remove_empty_files = false; 106 107 /* true if -R was specified on command line. */ 108 static bool reverse_flag_specified = false; 109 110 /* buffer holding the name of the rejected patch file. */ 111 static char rejname[NAME_MAX + 1]; 112 113 /* buffer for stderr */ 114 static char serrbuf[BUFSIZ]; 115 116 /* how many input lines have been irretractibly output */ 117 static LINENUM last_frozen_line = 0; 118 119 static int Argc; /* guess */ 120 static char **Argv; 121 static int Argc_last; /* for restarting plan_b */ 122 static char **Argv_last; 123 124 static FILE *ofp = NULL; /* output file pointer */ 125 static FILE *rejfp = NULL; /* reject file pointer */ 126 127 static int filec = 0; /* how many file arguments? */ 128 static LINENUM last_offset = 0; 129 static LINENUM maxfuzz = 2; 130 131 /* patch using ifdef, ifndef, etc. */ 132 static bool do_defines = false; 133 /* #ifdef xyzzy */ 134 static char if_defined[128]; 135 /* #ifndef xyzzy */ 136 static char not_defined[128]; 137 /* #else */ 138 static const char else_defined[] = "#else\n"; 139 /* #endif xyzzy */ 140 static char end_defined[128]; 141 142 143 /* Apply a set of diffs as appropriate. */ 144 145 int 146 main(int argc, char *argv[]) 147 { 148 int error = 0, hunk, failed, patch_seen = 0, i, fd; 149 LINENUM where = 0, newwhere, fuzz, mymaxfuzz; 150 const char *tmpdir; 151 char *v; 152 153 setbuf(stderr, serrbuf); 154 for (i = 0; i < MAXFILEC; i++) 155 filearg[i] = NULL; 156 157 /* Cons up the names of the temporary files. */ 158 if ((tmpdir = getenv("TMPDIR")) == NULL || *tmpdir == '\0') 159 tmpdir = _PATH_TMP; 160 for (i = strlen(tmpdir) - 1; i > 0 && tmpdir[i] == '/'; i--) 161 ; 162 i++; 163 if (asprintf(&TMPOUTNAME, "%.*s/patchoXXXXXXXXXX", i, tmpdir) == -1) 164 fatal("cannot allocate memory"); 165 if ((fd = mkstemp(TMPOUTNAME)) < 0) 166 pfatal("can't create %s", TMPOUTNAME); 167 close(fd); 168 169 if (asprintf(&TMPINNAME, "%.*s/patchiXXXXXXXXXX", i, tmpdir) == -1) 170 fatal("cannot allocate memory"); 171 if ((fd = mkstemp(TMPINNAME)) < 0) 172 pfatal("can't create %s", TMPINNAME); 173 close(fd); 174 175 if (asprintf(&TMPREJNAME, "%.*s/patchrXXXXXXXXXX", i, tmpdir) == -1) 176 fatal("cannot allocate memory"); 177 if ((fd = mkstemp(TMPREJNAME)) < 0) 178 pfatal("can't create %s", TMPREJNAME); 179 close(fd); 180 181 if (asprintf(&TMPPATNAME, "%.*s/patchpXXXXXXXXXX", i, tmpdir) == -1) 182 fatal("cannot allocate memory"); 183 if ((fd = mkstemp(TMPPATNAME)) < 0) 184 pfatal("can't create %s", TMPPATNAME); 185 close(fd); 186 187 v = getenv("SIMPLE_BACKUP_SUFFIX"); 188 if (v) 189 simple_backup_suffix = v; 190 else 191 simple_backup_suffix = ORIGEXT; 192 193 /* parse switches */ 194 Argc = argc; 195 Argv = argv; 196 get_some_switches(); 197 198 if (backup_type == none) { 199 if ((v = getenv("PATCH_VERSION_CONTROL")) == NULL) 200 v = getenv("VERSION_CONTROL"); 201 if (v != NULL || !posix) 202 backup_type = get_version(v); /* OK to pass NULL. */ 203 } 204 205 /* make sure we clean up /tmp in case of disaster */ 206 set_signals(0); 207 208 for (open_patch_file(filearg[1]); there_is_another_patch(); 209 reinitialize_almost_everything()) { 210 /* for each patch in patch file */ 211 212 patch_seen = true; 213 warn_on_invalid_line = true; 214 215 if (outname == NULL) 216 outname = savestr(filearg[0]); 217 218 /* for ed script just up and do it and exit */ 219 if (diff_type == ED_DIFF) { 220 do_ed_script(); 221 continue; 222 } 223 /* initialize the patched file */ 224 if (!skip_rest_of_patch) 225 init_output(TMPOUTNAME); 226 227 /* initialize reject file */ 228 init_reject(TMPREJNAME); 229 230 /* find out where all the lines are */ 231 if (!skip_rest_of_patch) 232 scan_input(filearg[0]); 233 234 /* from here on, open no standard i/o files, because malloc */ 235 /* might misfire and we can't catch it easily */ 236 237 /* apply each hunk of patch */ 238 hunk = 0; 239 failed = 0; 240 out_of_mem = false; 241 while (another_hunk()) { 242 hunk++; 243 fuzz = 0; 244 mymaxfuzz = pch_context(); 245 if (maxfuzz < mymaxfuzz) 246 mymaxfuzz = maxfuzz; 247 if (!skip_rest_of_patch) { 248 do { 249 where = locate_hunk(fuzz); 250 if (hunk == 1 && where == 0 && !force) { 251 /* dwim for reversed patch? */ 252 if (!pch_swap()) { 253 if (fuzz == 0) 254 say("Not enough memory to try swapped hunk! Assuming unswapped.\n"); 255 continue; 256 } 257 reverse = !reverse; 258 /* try again */ 259 where = locate_hunk(fuzz); 260 if (where == 0) { 261 /* didn't find it swapped */ 262 if (!pch_swap()) 263 /* put it back to normal */ 264 fatal("lost hunk on alloc error!\n"); 265 reverse = !reverse; 266 } else if (noreverse) { 267 if (!pch_swap()) 268 /* put it back to normal */ 269 fatal("lost hunk on alloc error!\n"); 270 reverse = !reverse; 271 say("Ignoring previously applied (or reversed) patch.\n"); 272 skip_rest_of_patch = true; 273 } else if (batch) { 274 if (verbose) 275 say("%seversed (or previously applied) patch detected! %s -R.", 276 reverse ? "R" : "Unr", 277 reverse ? "Assuming" : "Ignoring"); 278 } else { 279 ask("%seversed (or previously applied) patch detected! %s -R? [y] ", 280 reverse ? "R" : "Unr", 281 reverse ? "Assume" : "Ignore"); 282 if (*buf == 'n') { 283 ask("Apply anyway? [n] "); 284 if (*buf != 'y') 285 skip_rest_of_patch = true; 286 where = 0; 287 reverse = !reverse; 288 if (!pch_swap()) 289 /* put it back to normal */ 290 fatal("lost hunk on alloc error!\n"); 291 } 292 } 293 } 294 } while (!skip_rest_of_patch && where == 0 && 295 ++fuzz <= mymaxfuzz); 296 297 if (skip_rest_of_patch) { /* just got decided */ 298 fclose(ofp); 299 ofp = NULL; 300 } 301 } 302 newwhere = pch_newfirst() + last_offset; 303 if (skip_rest_of_patch) { 304 abort_hunk(); 305 failed++; 306 if (verbose) 307 say("Hunk #%d ignored at %ld.\n", 308 hunk, newwhere); 309 } else if (where == 0) { 310 abort_hunk(); 311 failed++; 312 if (verbose) 313 say("Hunk #%d failed at %ld.\n", 314 hunk, newwhere); 315 } else { 316 apply_hunk(where); 317 if (verbose) { 318 say("Hunk #%d succeeded at %ld", 319 hunk, newwhere); 320 if (fuzz != 0) 321 say(" with fuzz %ld", fuzz); 322 if (last_offset) 323 say(" (offset %ld line%s)", 324 last_offset, 325 last_offset == 1L ? "" : "s"); 326 say(".\n"); 327 } 328 } 329 } 330 331 if (out_of_mem && using_plan_a) { 332 Argc = Argc_last; 333 Argv = Argv_last; 334 say("\n\nRan out of memory using Plan A--trying again...\n\n"); 335 if (ofp) 336 fclose(ofp); 337 ofp = NULL; 338 if (rejfp) 339 fclose(rejfp); 340 rejfp = NULL; 341 continue; 342 } 343 if (hunk == 0) 344 fatal("Internal error: hunk should not be 0\n"); 345 346 /* finish spewing out the new file */ 347 if (!skip_rest_of_patch) 348 spew_output(); 349 350 /* and put the output where desired */ 351 ignore_signals(); 352 if (!skip_rest_of_patch) { 353 struct stat statbuf; 354 char *realout = outname; 355 356 if (!check_only) { 357 if (move_file(TMPOUTNAME, outname) < 0) { 358 toutkeep = true; 359 realout = TMPOUTNAME; 360 chmod(TMPOUTNAME, filemode); 361 } else 362 chmod(outname, filemode); 363 364 if (remove_empty_files && 365 stat(realout, &statbuf) == 0 && 366 statbuf.st_size == 0) { 367 if (verbose) 368 say("Removing %s (empty after patching).\n", 369 realout); 370 unlink(realout); 371 } 372 } 373 } 374 fclose(rejfp); 375 rejfp = NULL; 376 if (failed) { 377 error = 1; 378 if (*rejname == '\0') { 379 if (strlcpy(rejname, outname, 380 sizeof(rejname)) >= sizeof(rejname)) 381 fatal("filename %s is too long\n", outname); 382 if (strlcat(rejname, REJEXT, 383 sizeof(rejname)) >= sizeof(rejname)) 384 fatal("filename %s is too long\n", outname); 385 } 386 if (skip_rest_of_patch) { 387 say("%d out of %d hunks ignored--saving rejects to %s\n", 388 failed, hunk, rejname); 389 } else { 390 say("%d out of %d hunks failed--saving rejects to %s\n", 391 failed, hunk, rejname); 392 } 393 if (!check_only && move_file(TMPREJNAME, rejname) < 0) 394 trejkeep = true; 395 } 396 set_signals(1); 397 } 398 my_exit(error); 399 /* NOTREACHED */ 400 } 401 402 /* Prepare to find the next patch to do in the patch file. */ 403 404 static void 405 reinitialize_almost_everything(void) 406 { 407 re_patch(); 408 re_input(); 409 410 input_lines = 0; 411 last_frozen_line = 0; 412 413 filec = 0; 414 if (!out_of_mem) { 415 free(filearg[0]); 416 filearg[0] = NULL; 417 } 418 419 free(outname); 420 outname = NULL; 421 422 last_offset = 0; 423 diff_type = 0; 424 425 free(revision); 426 revision = NULL; 427 428 reverse = reverse_flag_specified; 429 skip_rest_of_patch = false; 430 431 get_some_switches(); 432 } 433 434 /* Process switches and filenames. */ 435 436 static void 437 get_some_switches(void) 438 { 439 const char *options = "b:B:cCd:D:eEfF:i:lnNo:p:r:RstuvV:x:z:"; 440 static struct option longopts[] = { 441 {"backup", no_argument, 0, 'b'}, 442 {"batch", no_argument, 0, 't'}, 443 {"check", no_argument, 0, 'C'}, 444 {"context", no_argument, 0, 'c'}, 445 {"debug", required_argument, 0, 'x'}, 446 {"directory", required_argument, 0, 'd'}, 447 {"ed", no_argument, 0, 'e'}, 448 {"force", no_argument, 0, 'f'}, 449 {"forward", no_argument, 0, 'N'}, 450 {"fuzz", required_argument, 0, 'F'}, 451 {"ifdef", required_argument, 0, 'D'}, 452 {"input", required_argument, 0, 'i'}, 453 {"ignore-whitespace", no_argument, 0, 'l'}, 454 {"normal", no_argument, 0, 'n'}, 455 {"output", required_argument, 0, 'o'}, 456 {"prefix", required_argument, 0, 'B'}, 457 {"quiet", no_argument, 0, 's'}, 458 {"reject-file", required_argument, 0, 'r'}, 459 {"remove-empty-files", no_argument, 0, 'E'}, 460 {"reverse", no_argument, 0, 'R'}, 461 {"silent", no_argument, 0, 's'}, 462 {"strip", required_argument, 0, 'p'}, 463 {"suffix", required_argument, 0, 'z'}, 464 {"unified", no_argument, 0, 'u'}, 465 {"version", no_argument, 0, 'v'}, 466 {"version-control", required_argument, 0, 'V'}, 467 {"posix", no_argument, &posix, 1}, 468 {NULL, 0, 0, 0} 469 }; 470 int ch; 471 472 rejname[0] = '\0'; 473 Argc_last = Argc; 474 Argv_last = Argv; 475 if (!Argc) 476 return; 477 optreset = optind = 1; 478 while ((ch = getopt_long(Argc, Argv, options, longopts, NULL)) != -1) { 479 switch (ch) { 480 case 'b': 481 if (backup_type == none) 482 backup_type = numbered_existing; 483 if (optarg == NULL) 484 break; 485 if (verbose) 486 say("Warning, the ``-b suffix'' option has been" 487 " obsoleted by the -z option.\n"); 488 /* FALLTHROUGH */ 489 case 'z': 490 /* must directly follow 'b' case for backwards compat */ 491 simple_backup_suffix = savestr(optarg); 492 break; 493 case 'B': 494 origprae = savestr(optarg); 495 break; 496 case 'c': 497 diff_type = CONTEXT_DIFF; 498 break; 499 case 'C': 500 check_only = true; 501 break; 502 case 'd': 503 if (chdir(optarg) < 0) 504 pfatal("can't cd to %s", optarg); 505 break; 506 case 'D': 507 do_defines = true; 508 if (!isalpha(*optarg) && *optarg != '_') 509 fatal("argument to -D is not an identifier\n"); 510 snprintf(if_defined, sizeof if_defined, 511 "#ifdef %s\n", optarg); 512 snprintf(not_defined, sizeof not_defined, 513 "#ifndef %s\n", optarg); 514 snprintf(end_defined, sizeof end_defined, 515 "#endif /* %s */\n", optarg); 516 break; 517 case 'e': 518 diff_type = ED_DIFF; 519 break; 520 case 'E': 521 remove_empty_files = true; 522 break; 523 case 'f': 524 force = true; 525 break; 526 case 'F': 527 maxfuzz = atoi(optarg); 528 break; 529 case 'i': 530 if (++filec == MAXFILEC) 531 fatal("too many file arguments\n"); 532 filearg[filec] = savestr(optarg); 533 break; 534 case 'l': 535 canonicalize = true; 536 break; 537 case 'n': 538 diff_type = NORMAL_DIFF; 539 break; 540 case 'N': 541 noreverse = true; 542 break; 543 case 'o': 544 outname = savestr(optarg); 545 break; 546 case 'p': 547 strippath = atoi(optarg); 548 break; 549 case 'r': 550 if (strlcpy(rejname, optarg, 551 sizeof(rejname)) >= sizeof(rejname)) 552 fatal("argument for -r is too long\n"); 553 break; 554 case 'R': 555 reverse = true; 556 reverse_flag_specified = true; 557 break; 558 case 's': 559 verbose = false; 560 break; 561 case 't': 562 batch = true; 563 break; 564 case 'u': 565 diff_type = UNI_DIFF; 566 break; 567 case 'v': 568 version(); 569 break; 570 case 'V': 571 backup_type = get_version(optarg); 572 break; 573 #ifdef DEBUGGING 574 case 'x': 575 debug = atoi(optarg); 576 break; 577 #endif 578 default: 579 if (ch != '\0') 580 usage(); 581 break; 582 } 583 } 584 Argc -= optind; 585 Argv += optind; 586 587 if (Argc > 0) { 588 filearg[0] = savestr(*Argv++); 589 Argc--; 590 while (Argc > 0) { 591 if (++filec == MAXFILEC) 592 fatal("too many file arguments\n"); 593 filearg[filec] = savestr(*Argv++); 594 Argc--; 595 } 596 } 597 598 if (getenv("POSIXLY_CORRECT") != NULL) 599 posix = 1; 600 } 601 602 static void 603 usage(void) 604 { 605 fprintf(stderr, 606 "usage: patch [-bcCeEflnNRstuv] [-B backup-prefix] [-d directory] [-D symbol]\n" 607 " [-F max-fuzz] [-i patchfile] [-o out-file] [-p strip-count]\n" 608 " [-r rej-name] [-V {numbered,existing,simple}] [-z backup-ext]\n" 609 " [origfile [patchfile]]\n"); 610 my_exit(EXIT_SUCCESS); 611 } 612 613 /* 614 * Attempt to find the right place to apply this hunk of patch. 615 */ 616 static LINENUM 617 locate_hunk(LINENUM fuzz) 618 { 619 LINENUM first_guess = pch_first() + last_offset; 620 LINENUM offset; 621 LINENUM pat_lines = pch_ptrn_lines(); 622 LINENUM max_pos_offset = input_lines - first_guess - pat_lines + 1; 623 LINENUM max_neg_offset = first_guess - last_frozen_line - 1 + pch_context(); 624 625 if (pat_lines == 0) { /* null range matches always */ 626 if (verbose && fuzz == 0 && (diff_type == CONTEXT_DIFF 627 || diff_type == NEW_CONTEXT_DIFF 628 || diff_type == UNI_DIFF)) { 629 say("Empty context always matches.\n"); 630 } 631 if (diff_type == CONTEXT_DIFF 632 || diff_type == NEW_CONTEXT_DIFF 633 || diff_type == UNI_DIFF) { 634 if (fuzz == 0) 635 return (input_lines == 0 ? first_guess : 0); 636 } else 637 return (first_guess); 638 } 639 if (max_neg_offset >= first_guess) /* do not try lines < 0 */ 640 max_neg_offset = first_guess - 1; 641 if (first_guess <= input_lines && patch_match(first_guess, 0, fuzz)) 642 return first_guess; 643 for (offset = 1; ; offset++) { 644 bool check_after = (offset <= max_pos_offset); 645 bool check_before = (offset <= max_neg_offset); 646 647 if (check_after && patch_match(first_guess, offset, fuzz)) { 648 #ifdef DEBUGGING 649 if (debug & 1) 650 say("Offset changing from %ld to %ld\n", 651 last_offset, offset); 652 #endif 653 last_offset = offset; 654 return first_guess + offset; 655 } else if (check_before && patch_match(first_guess, -offset, fuzz)) { 656 #ifdef DEBUGGING 657 if (debug & 1) 658 say("Offset changing from %ld to %ld\n", 659 last_offset, -offset); 660 #endif 661 last_offset = -offset; 662 return first_guess - offset; 663 } else if (!check_before && !check_after) 664 return 0; 665 } 666 } 667 668 /* We did not find the pattern, dump out the hunk so they can handle it. */ 669 670 static void 671 abort_hunk(void) 672 { 673 LINENUM i; 674 const LINENUM pat_end = pch_end(); 675 /* 676 * add in last_offset to guess the same as the previous successful 677 * hunk 678 */ 679 const LINENUM oldfirst = pch_first() + last_offset; 680 const LINENUM newfirst = pch_newfirst() + last_offset; 681 const LINENUM oldlast = oldfirst + pch_ptrn_lines() - 1; 682 const LINENUM newlast = newfirst + pch_repl_lines() - 1; 683 const char *stars = (diff_type >= NEW_CONTEXT_DIFF ? " ****" : ""); 684 const char *minuses = (diff_type >= NEW_CONTEXT_DIFF ? " ----" : " -----"); 685 686 fprintf(rejfp, "***************\n"); 687 for (i = 0; i <= pat_end; i++) { 688 switch (pch_char(i)) { 689 case '*': 690 if (oldlast < oldfirst) 691 fprintf(rejfp, "*** 0%s\n", stars); 692 else if (oldlast == oldfirst) 693 fprintf(rejfp, "*** %ld%s\n", oldfirst, stars); 694 else 695 fprintf(rejfp, "*** %ld,%ld%s\n", oldfirst, 696 oldlast, stars); 697 break; 698 case '=': 699 if (newlast < newfirst) 700 fprintf(rejfp, "--- 0%s\n", minuses); 701 else if (newlast == newfirst) 702 fprintf(rejfp, "--- %ld%s\n", newfirst, minuses); 703 else 704 fprintf(rejfp, "--- %ld,%ld%s\n", newfirst, 705 newlast, minuses); 706 break; 707 case '\n': 708 fprintf(rejfp, "%s", pfetch(i)); 709 break; 710 case ' ': 711 case '-': 712 case '+': 713 case '!': 714 fprintf(rejfp, "%c %s", pch_char(i), pfetch(i)); 715 break; 716 default: 717 fatal("fatal internal error in abort_hunk\n"); 718 } 719 } 720 } 721 722 /* We found where to apply it (we hope), so do it. */ 723 724 static void 725 apply_hunk(LINENUM where) 726 { 727 LINENUM old = 1; 728 const LINENUM lastline = pch_ptrn_lines(); 729 LINENUM new = lastline + 1; 730 #define OUTSIDE 0 731 #define IN_IFNDEF 1 732 #define IN_IFDEF 2 733 #define IN_ELSE 3 734 int def_state = OUTSIDE; 735 const LINENUM pat_end = pch_end(); 736 737 where--; 738 while (pch_char(new) == '=' || pch_char(new) == '\n') 739 new++; 740 741 while (old <= lastline) { 742 if (pch_char(old) == '-') { 743 copy_till(where + old - 1, false); 744 if (do_defines) { 745 if (def_state == OUTSIDE) { 746 fputs(not_defined, ofp); 747 def_state = IN_IFNDEF; 748 } else if (def_state == IN_IFDEF) { 749 fputs(else_defined, ofp); 750 def_state = IN_ELSE; 751 } 752 fputs(pfetch(old), ofp); 753 } 754 last_frozen_line++; 755 old++; 756 } else if (new > pat_end) { 757 break; 758 } else if (pch_char(new) == '+') { 759 copy_till(where + old - 1, false); 760 if (do_defines) { 761 if (def_state == IN_IFNDEF) { 762 fputs(else_defined, ofp); 763 def_state = IN_ELSE; 764 } else if (def_state == OUTSIDE) { 765 fputs(if_defined, ofp); 766 def_state = IN_IFDEF; 767 } 768 } 769 fputs(pfetch(new), ofp); 770 new++; 771 } else if (pch_char(new) != pch_char(old)) { 772 say("Out-of-sync patch, lines %ld,%ld--mangled text or line numbers, maybe?\n", 773 pch_hunk_beg() + old, 774 pch_hunk_beg() + new); 775 #ifdef DEBUGGING 776 say("oldchar = '%c', newchar = '%c'\n", 777 pch_char(old), pch_char(new)); 778 #endif 779 my_exit(2); 780 } else if (pch_char(new) == '!') { 781 copy_till(where + old - 1, false); 782 if (do_defines) { 783 fputs(not_defined, ofp); 784 def_state = IN_IFNDEF; 785 } 786 while (pch_char(old) == '!') { 787 if (do_defines) { 788 fputs(pfetch(old), ofp); 789 } 790 last_frozen_line++; 791 old++; 792 } 793 if (do_defines) { 794 fputs(else_defined, ofp); 795 def_state = IN_ELSE; 796 } 797 while (pch_char(new) == '!') { 798 fputs(pfetch(new), ofp); 799 new++; 800 } 801 } else { 802 if (pch_char(new) != ' ') 803 fatal("Internal error: expected ' '\n"); 804 old++; 805 new++; 806 if (do_defines && def_state != OUTSIDE) { 807 fputs(end_defined, ofp); 808 def_state = OUTSIDE; 809 } 810 } 811 } 812 if (new <= pat_end && pch_char(new) == '+') { 813 copy_till(where + old - 1, false); 814 if (do_defines) { 815 if (def_state == OUTSIDE) { 816 fputs(if_defined, ofp); 817 def_state = IN_IFDEF; 818 } else if (def_state == IN_IFNDEF) { 819 fputs(else_defined, ofp); 820 def_state = IN_ELSE; 821 } 822 } 823 while (new <= pat_end && pch_char(new) == '+') { 824 fputs(pfetch(new), ofp); 825 new++; 826 } 827 } 828 if (do_defines && def_state != OUTSIDE) { 829 fputs(end_defined, ofp); 830 } 831 } 832 833 /* 834 * Open the new file. 835 */ 836 static void 837 init_output(const char *name) 838 { 839 ofp = fopen(name, "w"); 840 if (ofp == NULL) 841 pfatal("can't create %s", name); 842 } 843 844 /* 845 * Open a file to put hunks we can't locate. 846 */ 847 static void 848 init_reject(const char *name) 849 { 850 rejfp = fopen(name, "w"); 851 if (rejfp == NULL) 852 pfatal("can't create %s", name); 853 } 854 855 /* 856 * Copy input file to output, up to wherever hunk is to be applied. 857 * If endoffile is true, treat the last line specially since it may 858 * lack a newline. 859 */ 860 static void 861 copy_till(LINENUM lastline, bool endoffile) 862 { 863 if (last_frozen_line > lastline) 864 fatal("misordered hunks! output would be garbled\n"); 865 while (last_frozen_line < lastline) { 866 if (++last_frozen_line == lastline && endoffile) 867 dump_line(last_frozen_line, !last_line_missing_eol); 868 else 869 dump_line(last_frozen_line, true); 870 } 871 } 872 873 /* 874 * Finish copying the input file to the output file. 875 */ 876 static void 877 spew_output(void) 878 { 879 #ifdef DEBUGGING 880 if (debug & 256) 881 say("il=%ld lfl=%ld\n", input_lines, last_frozen_line); 882 #endif 883 if (input_lines) 884 copy_till(input_lines, true); /* dump remainder of file */ 885 fclose(ofp); 886 ofp = NULL; 887 } 888 889 /* 890 * Copy one line from input to output. 891 */ 892 static void 893 dump_line(LINENUM line, bool write_newline) 894 { 895 char *s; 896 897 s = ifetch(line, 0); 898 if (s == NULL) 899 return; 900 /* Note: string is not NUL terminated. */ 901 for (; *s != '\n'; s++) 902 putc(*s, ofp); 903 if (write_newline) 904 putc('\n', ofp); 905 } 906 907 /* 908 * Does the patch pattern match at line base+offset? 909 */ 910 static bool 911 patch_match(LINENUM base, LINENUM offset, LINENUM fuzz) 912 { 913 LINENUM pline = 1 + fuzz; 914 LINENUM iline; 915 LINENUM pat_lines = pch_ptrn_lines() - fuzz; 916 const char *ilineptr; 917 const char *plineptr; 918 short plinelen; 919 920 for (iline = base + offset + fuzz; pline <= pat_lines; pline++, iline++) { 921 ilineptr = ifetch(iline, offset >= 0); 922 if (ilineptr == NULL) 923 return false; 924 plineptr = pfetch(pline); 925 plinelen = pch_line_len(pline); 926 if (canonicalize) { 927 if (!similar(ilineptr, plineptr, plinelen)) 928 return false; 929 } else if (strnNE(ilineptr, plineptr, plinelen)) 930 return false; 931 if (iline == input_lines) { 932 /* 933 * We are looking at the last line of the file. 934 * If the file has no eol, the patch line should 935 * not have one either and vice-versa. Note that 936 * plinelen > 0. 937 */ 938 if (last_line_missing_eol) { 939 if (plineptr[plinelen - 1] == '\n') 940 return false; 941 } else { 942 if (plineptr[plinelen - 1] != '\n') 943 return false; 944 } 945 } 946 } 947 return true; 948 } 949 950 /* 951 * Do two lines match with canonicalized white space? 952 */ 953 static bool 954 similar(const char *a, const char *b, int len) 955 { 956 while (len) { 957 if (isspace(*b)) { /* whitespace (or \n) to match? */ 958 if (!isspace(*a)) /* no corresponding whitespace? */ 959 return false; 960 while (len && isspace(*b) && *b != '\n') 961 b++, len--; /* skip pattern whitespace */ 962 while (isspace(*a) && *a != '\n') 963 a++; /* skip target whitespace */ 964 if (*a == '\n' || *b == '\n') 965 return (*a == *b); /* should end in sync */ 966 } else if (*a++ != *b++) /* match non-whitespace chars */ 967 return false; 968 else 969 len--; /* probably not necessary */ 970 } 971 return true; /* actually, this is not reached */ 972 /* since there is always a \n */ 973 } 974