1 /* $OpenBSD: patch.c,v 1.48 2009/10/27 23:59:41 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 #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 <stdio.h> 37 #include <string.h> 38 #include <stdlib.h> 39 40 #include "common.h" 41 #include "util.h" 42 #include "pch.h" 43 #include "inp.h" 44 #include "backupfile.h" 45 #include "pathnames.h" 46 47 mode_t filemode = 0644; 48 49 char buf[MAXLINELEN]; /* general purpose buffer */ 50 51 bool using_plan_a = true; /* try to keep everything in memory */ 52 bool out_of_mem = false; /* ran out of memory in plan a */ 53 54 #define MAXFILEC 2 55 56 char *filearg[MAXFILEC]; 57 bool ok_to_create_file = false; 58 char *outname = NULL; 59 char *origprae = NULL; 60 char *TMPOUTNAME; 61 char *TMPINNAME; 62 char *TMPREJNAME; 63 char *TMPPATNAME; 64 bool toutkeep = false; 65 bool trejkeep = false; 66 bool warn_on_invalid_line; 67 bool last_line_missing_eol; 68 69 #ifdef DEBUGGING 70 int debug = 0; 71 #endif 72 73 bool force = false; 74 bool batch = false; 75 bool verbose = true; 76 bool reverse = false; 77 bool noreverse = false; 78 bool skip_rest_of_patch = false; 79 int strippath = 957; 80 bool canonicalize = false; 81 bool check_only = false; 82 int diff_type = 0; 83 char *revision = NULL; /* prerequisite revision, if any */ 84 LINENUM input_lines = 0; /* how long is input file in lines */ 85 int posix = 0; /* strict POSIX mode? */ 86 87 static void reinitialize_almost_everything(void); 88 static void get_some_switches(void); 89 static LINENUM locate_hunk(LINENUM); 90 static void abort_context_hunk(void); 91 static void rej_line(int, LINENUM); 92 static void abort_hunk(void); 93 static void apply_hunk(LINENUM); 94 static void init_output(const char *); 95 static void init_reject(const char *); 96 static void copy_till(LINENUM, bool); 97 static void spew_output(void); 98 static void dump_line(LINENUM, bool); 99 static bool patch_match(LINENUM, LINENUM, LINENUM); 100 static bool similar(const char *, const char *, int); 101 static __dead void usage(void); 102 103 /* true if -E was specified on command line. */ 104 static bool remove_empty_files = false; 105 106 /* true if -R was specified on command line. */ 107 static bool reverse_flag_specified = false; 108 109 /* buffer holding the name of the rejected patch file. */ 110 static char rejname[NAME_MAX + 1]; 111 112 /* buffer for stderr */ 113 static char serrbuf[BUFSIZ]; 114 115 /* how many input lines have been irretractibly output */ 116 static LINENUM last_frozen_line = 0; 117 118 static int Argc; /* guess */ 119 static char **Argv; 120 static int Argc_last; /* for restarting plan_b */ 121 static char **Argv_last; 122 123 static FILE *ofp = NULL; /* output file pointer */ 124 static FILE *rejfp = NULL; /* reject file pointer */ 125 126 static int filec = 0; /* how many file arguments? */ 127 static LINENUM last_offset = 0; 128 static LINENUM maxfuzz = 2; 129 130 /* patch using ifdef, ifndef, etc. */ 131 static bool do_defines = false; 132 /* #ifdef xyzzy */ 133 static char if_defined[128]; 134 /* #ifndef xyzzy */ 135 static char not_defined[128]; 136 /* #else */ 137 static const char else_defined[] = "#else\n"; 138 /* #endif xyzzy */ 139 static char end_defined[128]; 140 141 142 /* Apply a set of diffs as appropriate. */ 143 144 int 145 main(int argc, char *argv[]) 146 { 147 int error = 0, hunk, failed, i, fd; 148 bool patch_seen; 149 LINENUM where = 0, newwhere, fuzz, mymaxfuzz; 150 const char *tmpdir; 151 char *v; 152 153 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 patch_seen = false; 209 for (open_patch_file(filearg[1]); there_is_another_patch(); 210 reinitialize_almost_everything()) { 211 /* for each patch in patch file */ 212 213 patch_seen = true; 214 215 warn_on_invalid_line = true; 216 217 if (outname == NULL) 218 outname = savestr(filearg[0]); 219 220 /* for ed script just up and do it and exit */ 221 if (diff_type == ED_DIFF) { 222 do_ed_script(); 223 continue; 224 } 225 /* initialize the patched file */ 226 if (!skip_rest_of_patch) 227 init_output(TMPOUTNAME); 228 229 /* initialize reject file */ 230 init_reject(TMPREJNAME); 231 232 /* find out where all the lines are */ 233 if (!skip_rest_of_patch) 234 scan_input(filearg[0]); 235 236 /* from here on, open no standard i/o files, because malloc */ 237 /* might misfire and we can't catch it easily */ 238 239 /* apply each hunk of patch */ 240 hunk = 0; 241 failed = 0; 242 out_of_mem = false; 243 while (another_hunk()) { 244 hunk++; 245 fuzz = 0; 246 mymaxfuzz = pch_context(); 247 if (maxfuzz < mymaxfuzz) 248 mymaxfuzz = maxfuzz; 249 if (!skip_rest_of_patch) { 250 do { 251 where = locate_hunk(fuzz); 252 if (hunk == 1 && where == 0 && !force) { 253 /* dwim for reversed patch? */ 254 if (!pch_swap()) { 255 if (fuzz == 0) 256 say("Not enough memory to try swapped hunk! Assuming unswapped.\n"); 257 continue; 258 } 259 reverse = !reverse; 260 /* try again */ 261 where = locate_hunk(fuzz); 262 if (where == 0) { 263 /* didn't find it swapped */ 264 if (!pch_swap()) 265 /* put it back to normal */ 266 fatal("lost hunk on alloc error!\n"); 267 reverse = !reverse; 268 } else if (noreverse) { 269 if (!pch_swap()) 270 /* put it back to normal */ 271 fatal("lost hunk on alloc error!\n"); 272 reverse = !reverse; 273 say("Ignoring previously applied (or reversed) patch.\n"); 274 skip_rest_of_patch = true; 275 } else if (batch) { 276 if (verbose) 277 say("%seversed (or previously applied) patch detected! %s -R.", 278 reverse ? "R" : "Unr", 279 reverse ? "Assuming" : "Ignoring"); 280 } else { 281 ask("%seversed (or previously applied) patch detected! %s -R? [y] ", 282 reverse ? "R" : "Unr", 283 reverse ? "Assume" : "Ignore"); 284 if (*buf == 'n') { 285 ask("Apply anyway? [n] "); 286 if (*buf != 'y') 287 skip_rest_of_patch = true; 288 where = 0; 289 reverse = !reverse; 290 if (!pch_swap()) 291 /* put it back to normal */ 292 fatal("lost hunk on alloc error!\n"); 293 } 294 } 295 } 296 } while (!skip_rest_of_patch && where == 0 && 297 ++fuzz <= mymaxfuzz); 298 299 if (skip_rest_of_patch) { /* just got decided */ 300 fclose(ofp); 301 ofp = NULL; 302 } 303 } 304 newwhere = pch_newfirst() + last_offset; 305 if (skip_rest_of_patch) { 306 abort_hunk(); 307 failed++; 308 if (verbose) 309 say("Hunk #%d ignored at %ld.\n", 310 hunk, newwhere); 311 } else if (where == 0) { 312 abort_hunk(); 313 failed++; 314 if (verbose) 315 say("Hunk #%d failed at %ld.\n", 316 hunk, newwhere); 317 } else { 318 apply_hunk(where); 319 if (verbose) { 320 say("Hunk #%d succeeded at %ld", 321 hunk, newwhere); 322 if (fuzz != 0) 323 say(" with fuzz %ld", fuzz); 324 if (last_offset) 325 say(" (offset %ld line%s)", 326 last_offset, 327 last_offset == 1L ? "" : "s"); 328 say(".\n"); 329 } 330 } 331 } 332 333 if (out_of_mem && using_plan_a) { 334 Argc = Argc_last; 335 Argv = Argv_last; 336 say("\n\nRan out of memory using Plan A--trying again...\n\n"); 337 if (ofp) 338 fclose(ofp); 339 ofp = NULL; 340 if (rejfp) 341 fclose(rejfp); 342 rejfp = NULL; 343 continue; 344 } 345 if (hunk == 0) 346 fatal("Internal error: hunk should not be 0\n"); 347 348 /* finish spewing out the new file */ 349 if (!skip_rest_of_patch) 350 spew_output(); 351 352 /* and put the output where desired */ 353 ignore_signals(); 354 if (!skip_rest_of_patch) { 355 struct stat statbuf; 356 char *realout = outname; 357 358 if (!check_only) { 359 if (move_file(TMPOUTNAME, outname) < 0) { 360 toutkeep = true; 361 realout = TMPOUTNAME; 362 chmod(TMPOUTNAME, filemode); 363 } else 364 chmod(outname, filemode); 365 366 if (remove_empty_files && 367 stat(realout, &statbuf) == 0 && 368 statbuf.st_size == 0) { 369 if (verbose) 370 say("Removing %s (empty after patching).\n", 371 realout); 372 unlink(realout); 373 } 374 } 375 } 376 fclose(rejfp); 377 rejfp = NULL; 378 if (failed) { 379 error = 1; 380 if (*rejname == '\0') { 381 if (strlcpy(rejname, outname, 382 sizeof(rejname)) >= sizeof(rejname)) 383 fatal("filename %s is too long\n", outname); 384 if (strlcat(rejname, REJEXT, 385 sizeof(rejname)) >= sizeof(rejname)) 386 fatal("filename %s is too long\n", outname); 387 } 388 if (skip_rest_of_patch) { 389 say("%d out of %d hunks ignored--saving rejects to %s\n", 390 failed, hunk, rejname); 391 } else { 392 say("%d out of %d hunks failed--saving rejects to %s\n", 393 failed, hunk, rejname); 394 } 395 if (!check_only && move_file(TMPREJNAME, rejname) < 0) 396 trejkeep = true; 397 } 398 set_signals(1); 399 } 400 401 if (!patch_seen) 402 error = 2; 403 404 my_exit(error); 405 /* NOTREACHED */ 406 } 407 408 /* Prepare to find the next patch to do in the patch file. */ 409 410 static void 411 reinitialize_almost_everything(void) 412 { 413 re_patch(); 414 re_input(); 415 416 input_lines = 0; 417 last_frozen_line = 0; 418 419 filec = 0; 420 if (!out_of_mem) { 421 free(filearg[0]); 422 filearg[0] = NULL; 423 } 424 425 free(outname); 426 outname = NULL; 427 428 last_offset = 0; 429 diff_type = 0; 430 431 free(revision); 432 revision = NULL; 433 434 reverse = reverse_flag_specified; 435 skip_rest_of_patch = false; 436 437 get_some_switches(); 438 } 439 440 /* Process switches and filenames. */ 441 442 static void 443 get_some_switches(void) 444 { 445 const char *options = "b::B:cCd:D:eEfF:i:lnNo:p:r:RstuvV:x:z:"; 446 static struct option longopts[] = { 447 {"backup", no_argument, 0, 'b'}, 448 {"batch", no_argument, 0, 't'}, 449 {"check", no_argument, 0, 'C'}, 450 {"context", no_argument, 0, 'c'}, 451 {"debug", required_argument, 0, 'x'}, 452 {"directory", required_argument, 0, 'd'}, 453 {"ed", no_argument, 0, 'e'}, 454 {"force", no_argument, 0, 'f'}, 455 {"forward", no_argument, 0, 'N'}, 456 {"fuzz", required_argument, 0, 'F'}, 457 {"ifdef", required_argument, 0, 'D'}, 458 {"input", required_argument, 0, 'i'}, 459 {"ignore-whitespace", no_argument, 0, 'l'}, 460 {"normal", no_argument, 0, 'n'}, 461 {"output", required_argument, 0, 'o'}, 462 {"prefix", required_argument, 0, 'B'}, 463 {"quiet", no_argument, 0, 's'}, 464 {"reject-file", required_argument, 0, 'r'}, 465 {"remove-empty-files", no_argument, 0, 'E'}, 466 {"reverse", no_argument, 0, 'R'}, 467 {"silent", no_argument, 0, 's'}, 468 {"strip", required_argument, 0, 'p'}, 469 {"suffix", required_argument, 0, 'z'}, 470 {"unified", no_argument, 0, 'u'}, 471 {"version", no_argument, 0, 'v'}, 472 {"version-control", required_argument, 0, 'V'}, 473 {"posix", no_argument, &posix, 1}, 474 {NULL, 0, 0, 0} 475 }; 476 int ch; 477 478 rejname[0] = '\0'; 479 Argc_last = Argc; 480 Argv_last = Argv; 481 if (!Argc) 482 return; 483 optreset = optind = 1; 484 while ((ch = getopt_long(Argc, Argv, options, longopts, NULL)) != -1) { 485 switch (ch) { 486 case 'b': 487 if (backup_type == none) 488 backup_type = numbered_existing; 489 if (optarg == NULL) 490 break; 491 if (verbose) 492 say("Warning, the ``-b suffix'' option has been" 493 " obsoleted by the -z option.\n"); 494 /* FALLTHROUGH */ 495 case 'z': 496 /* must directly follow 'b' case for backwards compat */ 497 simple_backup_suffix = savestr(optarg); 498 break; 499 case 'B': 500 origprae = savestr(optarg); 501 break; 502 case 'c': 503 diff_type = CONTEXT_DIFF; 504 break; 505 case 'C': 506 check_only = true; 507 break; 508 case 'd': 509 if (chdir(optarg) < 0) 510 pfatal("can't cd to %s", optarg); 511 break; 512 case 'D': 513 do_defines = true; 514 if (!isalpha(*optarg) && *optarg != '_') 515 fatal("argument to -D is not an identifier\n"); 516 snprintf(if_defined, sizeof if_defined, 517 "#ifdef %s\n", optarg); 518 snprintf(not_defined, sizeof not_defined, 519 "#ifndef %s\n", optarg); 520 snprintf(end_defined, sizeof end_defined, 521 "#endif /* %s */\n", optarg); 522 break; 523 case 'e': 524 diff_type = ED_DIFF; 525 break; 526 case 'E': 527 remove_empty_files = true; 528 break; 529 case 'f': 530 force = true; 531 break; 532 case 'F': 533 maxfuzz = atoi(optarg); 534 break; 535 case 'i': 536 if (++filec == MAXFILEC) 537 fatal("too many file arguments\n"); 538 filearg[filec] = savestr(optarg); 539 break; 540 case 'l': 541 canonicalize = true; 542 break; 543 case 'n': 544 diff_type = NORMAL_DIFF; 545 break; 546 case 'N': 547 noreverse = true; 548 break; 549 case 'o': 550 outname = savestr(optarg); 551 break; 552 case 'p': 553 strippath = atoi(optarg); 554 break; 555 case 'r': 556 if (strlcpy(rejname, optarg, 557 sizeof(rejname)) >= sizeof(rejname)) 558 fatal("argument for -r is too long\n"); 559 break; 560 case 'R': 561 reverse = true; 562 reverse_flag_specified = true; 563 break; 564 case 's': 565 verbose = false; 566 break; 567 case 't': 568 batch = true; 569 break; 570 case 'u': 571 diff_type = UNI_DIFF; 572 break; 573 case 'v': 574 version(); 575 break; 576 case 'V': 577 backup_type = get_version(optarg); 578 break; 579 #ifdef DEBUGGING 580 case 'x': 581 debug = atoi(optarg); 582 break; 583 #endif 584 default: 585 if (ch != '\0') 586 usage(); 587 break; 588 } 589 } 590 Argc -= optind; 591 Argv += optind; 592 593 if (Argc > 0) { 594 filearg[0] = savestr(*Argv++); 595 Argc--; 596 while (Argc > 0) { 597 if (++filec == MAXFILEC) 598 fatal("too many file arguments\n"); 599 filearg[filec] = savestr(*Argv++); 600 Argc--; 601 } 602 } 603 604 if (getenv("POSIXLY_CORRECT") != NULL) 605 posix = 1; 606 } 607 608 static __dead void 609 usage(void) 610 { 611 fprintf(stderr, 612 "usage: patch [-bCcEeflNnRstuv] [-B backup-prefix] [-D symbol] [-d directory]\n" 613 " [-F max-fuzz] [-i patchfile] [-o out-file] [-p strip-count]\n" 614 " [-r rej-name] [-V t | nil | never] [-x number] [-z backup-ext]\n" 615 " [--posix] [origfile [patchfile]]\n" 616 " patch <patchfile\n"); 617 my_exit(EXIT_SUCCESS); 618 } 619 620 /* 621 * Attempt to find the right place to apply this hunk of patch. 622 */ 623 static LINENUM 624 locate_hunk(LINENUM fuzz) 625 { 626 LINENUM first_guess = pch_first() + last_offset; 627 LINENUM offset; 628 LINENUM pat_lines = pch_ptrn_lines(); 629 LINENUM max_pos_offset = input_lines - first_guess - pat_lines + 1; 630 LINENUM max_neg_offset = first_guess - last_frozen_line - 1 + pch_context(); 631 632 if (pat_lines == 0) { /* null range matches always */ 633 if (verbose && fuzz == 0 && (diff_type == CONTEXT_DIFF 634 || diff_type == NEW_CONTEXT_DIFF 635 || diff_type == UNI_DIFF)) { 636 say("Empty context always matches.\n"); 637 } 638 return (first_guess); 639 } 640 if (max_neg_offset >= first_guess) /* do not try lines < 0 */ 641 max_neg_offset = first_guess - 1; 642 if (first_guess <= input_lines && patch_match(first_guess, 0, fuzz)) 643 return first_guess; 644 for (offset = 1; ; offset++) { 645 bool check_after = (offset <= max_pos_offset); 646 bool check_before = (offset <= max_neg_offset); 647 648 if (check_after && patch_match(first_guess, offset, fuzz)) { 649 #ifdef DEBUGGING 650 if (debug & 1) 651 say("Offset changing from %ld to %ld\n", 652 last_offset, offset); 653 #endif 654 last_offset = offset; 655 return first_guess + offset; 656 } else if (check_before && patch_match(first_guess, -offset, fuzz)) { 657 #ifdef DEBUGGING 658 if (debug & 1) 659 say("Offset changing from %ld to %ld\n", 660 last_offset, -offset); 661 #endif 662 last_offset = -offset; 663 return first_guess - offset; 664 } else if (!check_before && !check_after) 665 return 0; 666 } 667 } 668 669 /* We did not find the pattern, dump out the hunk so they can handle it. */ 670 671 static void 672 abort_context_hunk(void) 673 { 674 LINENUM i; 675 const LINENUM pat_end = pch_end(); 676 /* 677 * add in last_offset to guess the same as the previous successful 678 * hunk 679 */ 680 const LINENUM oldfirst = pch_first() + last_offset; 681 const LINENUM newfirst = pch_newfirst() + last_offset; 682 const LINENUM oldlast = oldfirst + pch_ptrn_lines() - 1; 683 const LINENUM newlast = newfirst + pch_repl_lines() - 1; 684 const char *stars = (diff_type >= NEW_CONTEXT_DIFF ? " ****" : ""); 685 const char *minuses = (diff_type >= NEW_CONTEXT_DIFF ? " ----" : " -----"); 686 687 fprintf(rejfp, "***************\n"); 688 for (i = 0; i <= pat_end; i++) { 689 switch (pch_char(i)) { 690 case '*': 691 if (oldlast < oldfirst) 692 fprintf(rejfp, "*** 0%s\n", stars); 693 else if (oldlast == oldfirst) 694 fprintf(rejfp, "*** %ld%s\n", oldfirst, stars); 695 else 696 fprintf(rejfp, "*** %ld,%ld%s\n", oldfirst, 697 oldlast, stars); 698 break; 699 case '=': 700 if (newlast < newfirst) 701 fprintf(rejfp, "--- 0%s\n", minuses); 702 else if (newlast == newfirst) 703 fprintf(rejfp, "--- %ld%s\n", newfirst, minuses); 704 else 705 fprintf(rejfp, "--- %ld,%ld%s\n", newfirst, 706 newlast, minuses); 707 break; 708 case '\n': 709 fprintf(rejfp, "%s", pfetch(i)); 710 break; 711 case ' ': 712 case '-': 713 case '+': 714 case '!': 715 fprintf(rejfp, "%c %s", pch_char(i), pfetch(i)); 716 break; 717 default: 718 fatal("fatal internal error in abort_context_hunk\n"); 719 } 720 } 721 } 722 723 static void 724 rej_line(int ch, LINENUM i) 725 { 726 size_t len; 727 const char *line = pfetch(i); 728 729 len = strlen(line); 730 731 fprintf(rejfp, "%c%s", ch, line); 732 if (len == 0 || line[len-1] != '\n') 733 fprintf(rejfp, "\n\\ No newline at end of file\n"); 734 } 735 736 static void 737 abort_hunk(void) 738 { 739 LINENUM i, j, split; 740 int ch1, ch2; 741 const LINENUM pat_end = pch_end(); 742 const LINENUM oldfirst = pch_first() + last_offset; 743 const LINENUM newfirst = pch_newfirst() + last_offset; 744 745 if (diff_type != UNI_DIFF) { 746 abort_context_hunk(); 747 return; 748 } 749 split = -1; 750 for (i = 0; i <= pat_end; i++) { 751 if (pch_char(i) == '=') { 752 split = i; 753 break; 754 } 755 } 756 if (split == -1) { 757 fprintf(rejfp, "malformed hunk: no split found\n"); 758 return; 759 } 760 i = 0; 761 j = split + 1; 762 fprintf(rejfp, "@@ -%ld,%ld +%ld,%ld @@\n", 763 pch_ptrn_lines() ? oldfirst : 0, 764 pch_ptrn_lines(), newfirst, pch_repl_lines()); 765 while (i < split || j <= pat_end) { 766 ch1 = i < split ? pch_char(i) : -1; 767 ch2 = j <= pat_end ? pch_char(j) : -1; 768 if (ch1 == '-') { 769 rej_line('-', i); 770 i++; 771 } else if (ch1 == ' ' && ch2 == ' ') { 772 rej_line(' ', i); 773 i++; 774 j++; 775 } else if (ch1 == '!' && ch2 == '!') { 776 while (i < split && ch1 == '!') { 777 rej_line('-', i); 778 i++; 779 ch1 = i < split ? pch_char(i) : -1; 780 } 781 while (j <= pat_end && ch2 == '!') { 782 rej_line('+', j); 783 j++; 784 ch2 = j <= pat_end ? pch_char(j) : -1; 785 } 786 } else if (ch1 == '*') { 787 i++; 788 } else if (ch2 == '+' || ch2 == ' ') { 789 rej_line(ch2, j); 790 j++; 791 } else { 792 fprintf(rejfp, "internal error on (%ld %ld %ld)\n", 793 i, split, j); 794 rej_line(ch1, i); 795 rej_line(ch2, j); 796 return; 797 } 798 } 799 } 800 801 /* We found where to apply it (we hope), so do it. */ 802 803 static void 804 apply_hunk(LINENUM where) 805 { 806 LINENUM old = 1; 807 const LINENUM lastline = pch_ptrn_lines(); 808 LINENUM new = lastline + 1; 809 #define OUTSIDE 0 810 #define IN_IFNDEF 1 811 #define IN_IFDEF 2 812 #define IN_ELSE 3 813 int def_state = OUTSIDE; 814 const LINENUM pat_end = pch_end(); 815 816 where--; 817 while (pch_char(new) == '=' || pch_char(new) == '\n') 818 new++; 819 820 while (old <= lastline) { 821 if (pch_char(old) == '-') { 822 copy_till(where + old - 1, false); 823 if (do_defines) { 824 if (def_state == OUTSIDE) { 825 fputs(not_defined, ofp); 826 def_state = IN_IFNDEF; 827 } else if (def_state == IN_IFDEF) { 828 fputs(else_defined, ofp); 829 def_state = IN_ELSE; 830 } 831 fputs(pfetch(old), ofp); 832 } 833 last_frozen_line++; 834 old++; 835 } else if (new > pat_end) { 836 break; 837 } else if (pch_char(new) == '+') { 838 copy_till(where + old - 1, false); 839 if (do_defines) { 840 if (def_state == IN_IFNDEF) { 841 fputs(else_defined, ofp); 842 def_state = IN_ELSE; 843 } else if (def_state == OUTSIDE) { 844 fputs(if_defined, ofp); 845 def_state = IN_IFDEF; 846 } 847 } 848 fputs(pfetch(new), ofp); 849 new++; 850 } else if (pch_char(new) != pch_char(old)) { 851 say("Out-of-sync patch, lines %ld,%ld--mangled text or line numbers, maybe?\n", 852 pch_hunk_beg() + old, 853 pch_hunk_beg() + new); 854 #ifdef DEBUGGING 855 say("oldchar = '%c', newchar = '%c'\n", 856 pch_char(old), pch_char(new)); 857 #endif 858 my_exit(2); 859 } else if (pch_char(new) == '!') { 860 copy_till(where + old - 1, false); 861 if (do_defines) { 862 fputs(not_defined, ofp); 863 def_state = IN_IFNDEF; 864 } 865 while (pch_char(old) == '!') { 866 if (do_defines) { 867 fputs(pfetch(old), ofp); 868 } 869 last_frozen_line++; 870 old++; 871 } 872 if (do_defines) { 873 fputs(else_defined, ofp); 874 def_state = IN_ELSE; 875 } 876 while (pch_char(new) == '!') { 877 fputs(pfetch(new), ofp); 878 new++; 879 } 880 } else { 881 if (pch_char(new) != ' ') 882 fatal("Internal error: expected ' '\n"); 883 old++; 884 new++; 885 if (do_defines && def_state != OUTSIDE) { 886 fputs(end_defined, ofp); 887 def_state = OUTSIDE; 888 } 889 } 890 } 891 if (new <= pat_end && pch_char(new) == '+') { 892 copy_till(where + old - 1, false); 893 if (do_defines) { 894 if (def_state == OUTSIDE) { 895 fputs(if_defined, ofp); 896 def_state = IN_IFDEF; 897 } else if (def_state == IN_IFNDEF) { 898 fputs(else_defined, ofp); 899 def_state = IN_ELSE; 900 } 901 } 902 while (new <= pat_end && pch_char(new) == '+') { 903 fputs(pfetch(new), ofp); 904 new++; 905 } 906 } 907 if (do_defines && def_state != OUTSIDE) { 908 fputs(end_defined, ofp); 909 } 910 } 911 912 /* 913 * Open the new file. 914 */ 915 static void 916 init_output(const char *name) 917 { 918 ofp = fopen(name, "w"); 919 if (ofp == NULL) 920 pfatal("can't create %s", name); 921 } 922 923 /* 924 * Open a file to put hunks we can't locate. 925 */ 926 static void 927 init_reject(const char *name) 928 { 929 rejfp = fopen(name, "w"); 930 if (rejfp == NULL) 931 pfatal("can't create %s", name); 932 } 933 934 /* 935 * Copy input file to output, up to wherever hunk is to be applied. 936 * If endoffile is true, treat the last line specially since it may 937 * lack a newline. 938 */ 939 static void 940 copy_till(LINENUM lastline, bool endoffile) 941 { 942 if (last_frozen_line > lastline) 943 fatal("misordered hunks! output would be garbled\n"); 944 while (last_frozen_line < lastline) { 945 if (++last_frozen_line == lastline && endoffile) 946 dump_line(last_frozen_line, !last_line_missing_eol); 947 else 948 dump_line(last_frozen_line, true); 949 } 950 } 951 952 /* 953 * Finish copying the input file to the output file. 954 */ 955 static void 956 spew_output(void) 957 { 958 #ifdef DEBUGGING 959 if (debug & 256) 960 say("il=%ld lfl=%ld\n", input_lines, last_frozen_line); 961 #endif 962 if (input_lines) 963 copy_till(input_lines, true); /* dump remainder of file */ 964 fclose(ofp); 965 ofp = NULL; 966 } 967 968 /* 969 * Copy one line from input to output. 970 */ 971 static void 972 dump_line(LINENUM line, bool write_newline) 973 { 974 char *s; 975 976 s = ifetch(line, 0); 977 if (s == NULL) 978 return; 979 /* Note: string is not NUL terminated. */ 980 for (; *s != '\n'; s++) 981 putc(*s, ofp); 982 if (write_newline) 983 putc('\n', ofp); 984 } 985 986 /* 987 * Does the patch pattern match at line base+offset? 988 */ 989 static bool 990 patch_match(LINENUM base, LINENUM offset, LINENUM fuzz) 991 { 992 LINENUM pline = 1 + fuzz; 993 LINENUM iline; 994 LINENUM pat_lines = pch_ptrn_lines() - fuzz; 995 const char *ilineptr; 996 const char *plineptr; 997 short plinelen; 998 999 for (iline = base + offset + fuzz; pline <= pat_lines; pline++, iline++) { 1000 ilineptr = ifetch(iline, offset >= 0); 1001 if (ilineptr == NULL) 1002 return false; 1003 plineptr = pfetch(pline); 1004 plinelen = pch_line_len(pline); 1005 if (canonicalize) { 1006 if (!similar(ilineptr, plineptr, plinelen)) 1007 return false; 1008 } else if (strnNE(ilineptr, plineptr, plinelen)) 1009 return false; 1010 if (iline == input_lines) { 1011 /* 1012 * We are looking at the last line of the file. 1013 * If the file has no eol, the patch line should 1014 * not have one either and vice-versa. Note that 1015 * plinelen > 0. 1016 */ 1017 if (last_line_missing_eol) { 1018 if (plineptr[plinelen - 1] == '\n') 1019 return false; 1020 } else { 1021 if (plineptr[plinelen - 1] != '\n') 1022 return false; 1023 } 1024 } 1025 } 1026 return true; 1027 } 1028 1029 /* 1030 * Do two lines match with canonicalized white space? 1031 */ 1032 static bool 1033 similar(const char *a, const char *b, int len) 1034 { 1035 while (len) { 1036 if (isspace(*b)) { /* whitespace (or \n) to match? */ 1037 if (!isspace(*a)) /* no corresponding whitespace? */ 1038 return false; 1039 while (len && isspace(*b) && *b != '\n') 1040 b++, len--; /* skip pattern whitespace */ 1041 while (isspace(*a) && *a != '\n') 1042 a++; /* skip target whitespace */ 1043 if (*a == '\n' || *b == '\n') 1044 return (*a == *b); /* should end in sync */ 1045 } else if (*a++ != *b++) /* match non-whitespace chars */ 1046 return false; 1047 else 1048 len--; /* probably not necessary */ 1049 } 1050 return true; /* actually, this is not reached */ 1051 /* since there is always a \n */ 1052 } 1053