1 /* $OpenBSD: patch.c,v 1.71 2022/08/03 07:30:37 op Exp $ */ 2 3 /* 4 * patch - a program to apply diffs to original files 5 * 6 * Copyright 1986, Larry Wall 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following condition is met: 10 * 1. Redistributions of source code must retain the above copyright notice, 11 * this condition and the following disclaimer. 12 * 13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY 14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 15 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 16 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR 17 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 19 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 20 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23 * SUCH DAMAGE. 24 * 25 * -C option added in 1998, original code by Marc Espie, based on FreeBSD 26 * behaviour 27 */ 28 29 #include <sys/types.h> 30 #include <sys/stat.h> 31 #include <unistd.h> 32 33 #include <ctype.h> 34 #include <getopt.h> 35 #include <limits.h> 36 #include <paths.h> 37 #include <stdio.h> 38 #include <string.h> 39 #include <stdlib.h> 40 41 #include "common.h" 42 #include "util.h" 43 #include "pch.h" 44 #include "inp.h" 45 #include "backupfile.h" 46 #include "ed.h" 47 48 mode_t filemode = 0644; 49 50 char *buf; /* general purpose buffer */ 51 size_t bufsz; /* general purpose buffer size */ 52 53 bool using_plan_a = true; /* try to keep everything in memory */ 54 bool out_of_mem = false; /* ran out of memory in plan a */ 55 56 #define MAXFILEC 2 57 58 char *filearg[MAXFILEC]; 59 bool ok_to_create_file = false; 60 char *outname = NULL; 61 char *origprae = NULL; 62 char *TMPOUTNAME; 63 char *TMPINNAME; 64 char *TMPREJNAME; 65 char *TMPPATNAME; 66 bool toutkeep = false; 67 bool trejkeep = false; 68 bool warn_on_invalid_line; 69 bool last_line_missing_eol; 70 71 #ifdef DEBUGGING 72 int debug = 0; 73 #endif 74 75 bool force = false; 76 bool batch = false; 77 bool verbose = true; 78 bool reverse = false; 79 bool noreverse = false; 80 bool skip_rest_of_patch = false; 81 int strippath = 957; 82 bool canonicalize = false; 83 bool check_only = false; 84 int diff_type = 0; 85 char *revision = NULL; /* prerequisite revision, if any */ 86 LINENUM input_lines = 0; /* how long is input file in lines */ 87 int posix = 0; /* strict POSIX mode? */ 88 89 static void reinitialize_almost_everything(void); 90 static void get_some_switches(void); 91 static LINENUM locate_hunk(LINENUM); 92 static void abort_context_hunk(void); 93 static void rej_line(int, LINENUM); 94 static void abort_hunk(void); 95 static void apply_hunk(LINENUM); 96 static void init_output(const char *); 97 static void init_reject(const char *); 98 static void copy_till(LINENUM, bool); 99 static void spew_output(void); 100 static void dump_line(LINENUM, bool); 101 static bool patch_match(LINENUM, LINENUM, LINENUM); 102 static bool similar(const char *, const char *, int); 103 static __dead void usage(void); 104 105 /* true if -E was specified on command line. */ 106 static bool remove_empty_files = false; 107 108 /* true if -R was specified on command line. */ 109 static bool reverse_flag_specified = false; 110 111 /* buffer holding the name of the rejected patch file. */ 112 static char rejname[PATH_MAX]; 113 114 /* how many input lines have been irretractibly output */ 115 static LINENUM last_frozen_line = 0; 116 117 static int Argc; /* guess */ 118 static char **Argv; 119 static int Argc_last; /* for restarting plan_b */ 120 static char **Argv_last; 121 122 static FILE *ofp = NULL; /* output file pointer */ 123 static FILE *rejfp = NULL; /* reject file pointer */ 124 125 static int filec = 0; /* how many file arguments? */ 126 static LINENUM last_offset = 0; 127 static LINENUM maxfuzz = 2; 128 129 /* patch using ifdef, ifndef, etc. */ 130 static bool do_defines = false; 131 /* #ifdef xyzzy */ 132 static char if_defined[128]; 133 /* #ifndef xyzzy */ 134 static char not_defined[128]; 135 /* #else */ 136 static const char else_defined[] = "#else\n"; 137 /* #endif xyzzy */ 138 static char end_defined[128]; 139 140 141 /* Apply a set of diffs as appropriate. */ 142 143 int 144 main(int argc, char *argv[]) 145 { 146 int error = 0, hunk, failed, i, fd; 147 bool patch_seen; 148 LINENUM where = 0, newwhere, fuzz, mymaxfuzz; 149 const char *tmpdir; 150 char *v; 151 152 if (pledge("stdio rpath wpath cpath tmppath fattr", NULL) == -1) { 153 perror("pledge"); 154 my_exit(2); 155 } 156 157 bufsz = INITLINELEN; 158 if ((buf = malloc(bufsz)) == NULL) 159 pfatal("allocating input buffer"); 160 buf[0] = '\0'; 161 162 setvbuf(stdout, NULL, _IOLBF, 0); 163 setvbuf(stderr, NULL, _IOLBF, 0); 164 for (i = 0; i < MAXFILEC; i++) 165 filearg[i] = NULL; 166 167 /* Cons up the names of the temporary files. */ 168 if ((tmpdir = getenv("TMPDIR")) == NULL || *tmpdir == '\0') 169 tmpdir = _PATH_TMP; 170 for (i = strlen(tmpdir) - 1; i > 0 && tmpdir[i] == '/'; i--) 171 ; 172 i++; 173 if (asprintf(&TMPOUTNAME, "%.*s/patchoXXXXXXXXXX", i, tmpdir) == -1) 174 fatal("cannot allocate memory"); 175 if ((fd = mkstemp(TMPOUTNAME)) == -1) 176 pfatal("can't create %s", TMPOUTNAME); 177 close(fd); 178 179 if (asprintf(&TMPINNAME, "%.*s/patchiXXXXXXXXXX", i, tmpdir) == -1) 180 fatal("cannot allocate memory"); 181 if ((fd = mkstemp(TMPINNAME)) == -1) 182 pfatal("can't create %s", TMPINNAME); 183 close(fd); 184 185 if (asprintf(&TMPREJNAME, "%.*s/patchrXXXXXXXXXX", i, tmpdir) == -1) 186 fatal("cannot allocate memory"); 187 if ((fd = mkstemp(TMPREJNAME)) == -1) 188 pfatal("can't create %s", TMPREJNAME); 189 close(fd); 190 191 if (asprintf(&TMPPATNAME, "%.*s/patchpXXXXXXXXXX", i, tmpdir) == -1) 192 fatal("cannot allocate memory"); 193 if ((fd = mkstemp(TMPPATNAME)) == -1) 194 pfatal("can't create %s", TMPPATNAME); 195 close(fd); 196 197 v = getenv("SIMPLE_BACKUP_SUFFIX"); 198 if (v) 199 simple_backup_suffix = v; 200 else 201 simple_backup_suffix = ORIGEXT; 202 203 /* parse switches */ 204 Argc = argc; 205 Argv = argv; 206 get_some_switches(); 207 208 if (backup_type == none) { 209 if ((v = getenv("PATCH_VERSION_CONTROL")) == NULL) 210 v = getenv("VERSION_CONTROL"); 211 if (v != NULL || !posix) 212 backup_type = get_version(v); /* OK to pass NULL. */ 213 } 214 215 /* make sure we clean up /tmp in case of disaster */ 216 set_signals(0); 217 218 patch_seen = false; 219 for (open_patch_file(filearg[1]); there_is_another_patch(); 220 reinitialize_almost_everything()) { 221 /* for each patch in patch file */ 222 223 patch_seen = true; 224 225 warn_on_invalid_line = true; 226 227 if (outname == NULL) 228 outname = xstrdup(filearg[0]); 229 230 /* initialize the patched file */ 231 if (!skip_rest_of_patch) 232 init_output(TMPOUTNAME); 233 234 /* initialize reject file */ 235 init_reject(TMPREJNAME); 236 237 /* find out where all the lines are */ 238 if (!skip_rest_of_patch) 239 scan_input(filearg[0]); 240 241 /* for ed script just up and do it and exit */ 242 if (diff_type == ED_DIFF) { 243 do_ed_script(); 244 continue; 245 } 246 247 /* from here on, open no standard i/o files, because malloc */ 248 /* might misfire and we can't catch it easily */ 249 250 /* apply each hunk of patch */ 251 hunk = 0; 252 failed = 0; 253 out_of_mem = false; 254 while (another_hunk()) { 255 hunk++; 256 fuzz = 0; 257 mymaxfuzz = pch_context(); 258 if (maxfuzz < mymaxfuzz) 259 mymaxfuzz = maxfuzz; 260 if (!skip_rest_of_patch) { 261 do { 262 where = locate_hunk(fuzz); 263 if ((hunk == 1 && where == 0 && !force) || 264 (where == 1 && pch_ptrn_lines() == 0 && !force)) { 265 /* dwim for reversed patch? */ 266 if (!pch_swap()) { 267 if (fuzz == 0) 268 say("Not enough memory to try swapped hunk! Assuming unswapped.\n"); 269 continue; 270 } 271 reverse = !reverse; 272 /* try again */ 273 where = locate_hunk(fuzz); 274 if (where == 0) { 275 /* didn't find it swapped */ 276 if (!pch_swap()) 277 /* put it back to normal */ 278 fatal("lost hunk on alloc error!\n"); 279 reverse = !reverse; 280 281 /* restore position if this patch creates a file */ 282 if (pch_ptrn_lines() == 0) 283 where = 1; 284 } else if (noreverse) { 285 if (!pch_swap()) 286 /* put it back to normal */ 287 fatal("lost hunk on alloc error!\n"); 288 reverse = !reverse; 289 say("Ignoring previously applied (or reversed) patch.\n"); 290 skip_rest_of_patch = true; 291 } else if (batch) { 292 if (verbose) 293 say("%seversed (or previously applied) patch detected! %s -R.", 294 reverse ? "R" : "Unr", 295 reverse ? "Assuming" : "Ignoring"); 296 } else { 297 ask("%seversed (or previously applied) patch detected! %s -R? [y] ", 298 reverse ? "R" : "Unr", 299 reverse ? "Assume" : "Ignore"); 300 if (*buf == 'n') { 301 ask("Apply anyway? [n] "); 302 if (*buf != 'y') 303 skip_rest_of_patch = true; 304 where = 0; 305 reverse = !reverse; 306 if (!pch_swap()) 307 /* put it back to normal */ 308 fatal("lost hunk on alloc error!\n"); 309 } 310 } 311 } 312 } while (!skip_rest_of_patch && where == 0 && 313 ++fuzz <= mymaxfuzz); 314 315 if (skip_rest_of_patch) { /* just got decided */ 316 fclose(ofp); 317 ofp = NULL; 318 } 319 } 320 newwhere = pch_newfirst() + last_offset; 321 if (skip_rest_of_patch) { 322 abort_hunk(); 323 failed++; 324 if (verbose) 325 say("Hunk #%d ignored at %ld.\n", 326 hunk, newwhere); 327 } else if (where == 0) { 328 abort_hunk(); 329 failed++; 330 if (verbose) 331 say("Hunk #%d failed at %ld.\n", 332 hunk, newwhere); 333 } else { 334 apply_hunk(where); 335 if (verbose) { 336 say("Hunk #%d succeeded at %ld", 337 hunk, newwhere); 338 if (fuzz != 0) 339 say(" with fuzz %ld", fuzz); 340 if (last_offset) 341 say(" (offset %ld line%s)", 342 last_offset, 343 last_offset == 1L ? "" : "s"); 344 say(".\n"); 345 } 346 } 347 } 348 349 if (out_of_mem && using_plan_a) { 350 Argc = Argc_last; 351 Argv = Argv_last; 352 say("\n\nRan out of memory using Plan A--trying again...\n\n"); 353 if (ofp) 354 fclose(ofp); 355 ofp = NULL; 356 if (rejfp) 357 fclose(rejfp); 358 rejfp = NULL; 359 continue; 360 } 361 if (hunk == 0) 362 fatal("Internal error: hunk should not be 0\n"); 363 364 /* finish spewing out the new file */ 365 if (!skip_rest_of_patch) 366 spew_output(); 367 368 /* and put the output where desired */ 369 ignore_signals(); 370 if (!skip_rest_of_patch) { 371 struct stat statbuf; 372 char *realout = outname; 373 374 if (!check_only) { 375 if (move_file(TMPOUTNAME, outname) < 0) { 376 toutkeep = true; 377 realout = TMPOUTNAME; 378 chmod(TMPOUTNAME, filemode); 379 } else 380 chmod(outname, filemode); 381 382 if (remove_empty_files && 383 stat(realout, &statbuf) == 0 && 384 statbuf.st_size == 0) { 385 if (verbose) 386 say("Removing %s (empty after patching).\n", 387 realout); 388 unlink(realout); 389 } 390 } 391 } 392 fclose(rejfp); 393 rejfp = NULL; 394 if (failed) { 395 error = 1; 396 if (*rejname == '\0') { 397 if (strlcpy(rejname, outname, 398 sizeof(rejname)) >= sizeof(rejname)) 399 fatal("filename %s is too long\n", outname); 400 if (strlcat(rejname, REJEXT, 401 sizeof(rejname)) >= sizeof(rejname)) 402 fatal("filename %s is too long\n", outname); 403 } 404 if (!check_only) 405 say("%d out of %d hunks %s--saving rejects to %s\n", 406 failed, hunk, skip_rest_of_patch ? "ignored" : "failed", rejname); 407 else 408 say("%d out of %d hunks %s\n", 409 failed, hunk, skip_rest_of_patch ? "ignored" : "failed"); 410 if (!check_only && move_file(TMPREJNAME, rejname) < 0) 411 trejkeep = true; 412 } 413 set_signals(1); 414 } 415 416 if (!patch_seen) 417 error = 2; 418 419 my_exit(error); 420 /* NOTREACHED */ 421 } 422 423 /* Prepare to find the next patch to do in the patch file. */ 424 425 static void 426 reinitialize_almost_everything(void) 427 { 428 re_patch(); 429 re_input(); 430 431 input_lines = 0; 432 last_frozen_line = 0; 433 434 filec = 0; 435 if (!out_of_mem) { 436 free(filearg[0]); 437 filearg[0] = NULL; 438 } 439 440 free(outname); 441 outname = NULL; 442 443 last_offset = 0; 444 diff_type = 0; 445 446 free(revision); 447 revision = NULL; 448 449 reverse = reverse_flag_specified; 450 skip_rest_of_patch = false; 451 452 get_some_switches(); 453 } 454 455 /* Process switches and filenames. */ 456 457 static void 458 get_some_switches(void) 459 { 460 const char *options = "b::B:cCd:D:eEfF:i:lnNo:p:r:RstuvV:x:z:"; 461 static struct option longopts[] = { 462 {"backup", no_argument, 0, 'b'}, 463 {"batch", no_argument, 0, 't'}, 464 {"check", no_argument, 0, 'C'}, 465 {"context", no_argument, 0, 'c'}, 466 {"debug", required_argument, 0, 'x'}, 467 {"directory", required_argument, 0, 'd'}, 468 {"dry-run", no_argument, 0, 'C'}, 469 {"ed", no_argument, 0, 'e'}, 470 {"force", no_argument, 0, 'f'}, 471 {"forward", no_argument, 0, 'N'}, 472 {"fuzz", required_argument, 0, 'F'}, 473 {"ifdef", required_argument, 0, 'D'}, 474 {"input", required_argument, 0, 'i'}, 475 {"ignore-whitespace", no_argument, 0, 'l'}, 476 {"normal", no_argument, 0, 'n'}, 477 {"output", required_argument, 0, 'o'}, 478 {"prefix", required_argument, 0, 'B'}, 479 {"quiet", no_argument, 0, 's'}, 480 {"reject-file", required_argument, 0, 'r'}, 481 {"remove-empty-files", no_argument, 0, 'E'}, 482 {"reverse", no_argument, 0, 'R'}, 483 {"silent", no_argument, 0, 's'}, 484 {"strip", required_argument, 0, 'p'}, 485 {"suffix", required_argument, 0, 'z'}, 486 {"unified", no_argument, 0, 'u'}, 487 {"version", no_argument, 0, 'v'}, 488 {"version-control", required_argument, 0, 'V'}, 489 {"posix", no_argument, &posix, 1}, 490 {NULL, 0, 0, 0} 491 }; 492 int ch; 493 494 rejname[0] = '\0'; 495 Argc_last = Argc; 496 Argv_last = Argv; 497 if (!Argc) 498 return; 499 optreset = optind = 1; 500 while ((ch = getopt_long(Argc, Argv, options, longopts, NULL)) != -1) { 501 switch (ch) { 502 case 'b': 503 if (backup_type == none) 504 backup_type = numbered_existing; 505 if (optarg == NULL) 506 break; 507 if (verbose) 508 say("Warning, the ``-b suffix'' option has been" 509 " obsoleted by the -z option.\n"); 510 /* FALLTHROUGH */ 511 case 'z': 512 /* must directly follow 'b' case for backwards compat */ 513 simple_backup_suffix = xstrdup(optarg); 514 break; 515 case 'B': 516 origprae = xstrdup(optarg); 517 break; 518 case 'c': 519 diff_type = CONTEXT_DIFF; 520 break; 521 case 'C': 522 check_only = true; 523 break; 524 case 'd': 525 if (chdir(optarg) == -1) 526 pfatal("can't cd to %s", optarg); 527 break; 528 case 'D': 529 do_defines = true; 530 if (!isalpha((unsigned char)*optarg) && *optarg != '_') 531 fatal("argument to -D is not an identifier\n"); 532 snprintf(if_defined, sizeof if_defined, 533 "#ifdef %s\n", optarg); 534 snprintf(not_defined, sizeof not_defined, 535 "#ifndef %s\n", optarg); 536 snprintf(end_defined, sizeof end_defined, 537 "#endif /* %s */\n", optarg); 538 break; 539 case 'e': 540 diff_type = ED_DIFF; 541 break; 542 case 'E': 543 remove_empty_files = true; 544 break; 545 case 'f': 546 force = true; 547 break; 548 case 'F': 549 maxfuzz = atoi(optarg); 550 break; 551 case 'i': 552 if (++filec == MAXFILEC) 553 fatal("too many file arguments\n"); 554 filearg[filec] = xstrdup(optarg); 555 break; 556 case 'l': 557 canonicalize = true; 558 break; 559 case 'n': 560 diff_type = NORMAL_DIFF; 561 break; 562 case 'N': 563 noreverse = true; 564 break; 565 case 'o': 566 outname = xstrdup(optarg); 567 break; 568 case 'p': 569 strippath = atoi(optarg); 570 break; 571 case 'r': 572 if (strlcpy(rejname, optarg, 573 sizeof(rejname)) >= sizeof(rejname)) 574 fatal("argument for -r is too long\n"); 575 break; 576 case 'R': 577 reverse = true; 578 reverse_flag_specified = true; 579 break; 580 case 's': 581 verbose = false; 582 break; 583 case 't': 584 batch = true; 585 break; 586 case 'u': 587 diff_type = UNI_DIFF; 588 break; 589 case 'v': 590 version(); 591 break; 592 case 'V': 593 backup_type = get_version(optarg); 594 break; 595 #ifdef DEBUGGING 596 case 'x': 597 debug = atoi(optarg); 598 break; 599 #endif 600 default: 601 if (ch != '\0') 602 usage(); 603 break; 604 } 605 } 606 Argc -= optind; 607 Argv += optind; 608 609 if (Argc > 0) { 610 filearg[0] = xstrdup(*Argv++); 611 Argc--; 612 while (Argc > 0) { 613 if (++filec == MAXFILEC) 614 fatal("too many file arguments\n"); 615 filearg[filec] = xstrdup(*Argv++); 616 Argc--; 617 } 618 } 619 620 if (getenv("POSIXLY_CORRECT") != NULL) 621 posix = 1; 622 } 623 624 static __dead void 625 usage(void) 626 { 627 fprintf(stderr, 628 "usage: patch [-bCcEeflNnRstuv] [-B backup-prefix] [-D symbol] [-d directory]\n" 629 " [-F max-fuzz] [-i patchfile] [-o out-file] [-p strip-count]\n" 630 " [-r rej-name] [-V t | nil | never] [-x number] [-z backup-ext]\n" 631 " [--posix] [origfile [patchfile]]\n" 632 " patch <patchfile\n"); 633 my_exit(2); 634 } 635 636 /* 637 * Attempt to find the right place to apply this hunk of patch. 638 */ 639 static LINENUM 640 locate_hunk(LINENUM fuzz) 641 { 642 LINENUM first_guess = pch_first() + last_offset; 643 LINENUM offset; 644 LINENUM pat_lines = pch_ptrn_lines(); 645 LINENUM max_pos_offset = input_lines - first_guess - pat_lines + 1; 646 LINENUM max_neg_offset = first_guess - last_frozen_line - 1 + pch_context(); 647 648 if (pat_lines == 0) { /* null range matches always */ 649 if (verbose && fuzz == 0 && (diff_type == CONTEXT_DIFF 650 || diff_type == NEW_CONTEXT_DIFF 651 || diff_type == UNI_DIFF)) { 652 say("Empty context always matches.\n"); 653 } 654 if (first_guess == 0) 655 return 1; 656 return (first_guess); 657 } 658 if (max_neg_offset >= first_guess) /* do not try lines < 0 */ 659 max_neg_offset = first_guess - 1; 660 if (first_guess <= input_lines && patch_match(first_guess, 0, fuzz)) 661 return first_guess; 662 for (offset = 1; ; offset++) { 663 bool check_after = (offset <= max_pos_offset); 664 bool check_before = (offset <= max_neg_offset); 665 666 if (check_after && patch_match(first_guess, offset, fuzz)) { 667 #ifdef DEBUGGING 668 if (debug & 1) 669 say("Offset changing from %ld to %ld\n", 670 last_offset, offset); 671 #endif 672 last_offset = offset; 673 return first_guess + offset; 674 } else if (check_before && patch_match(first_guess, -offset, fuzz)) { 675 #ifdef DEBUGGING 676 if (debug & 1) 677 say("Offset changing from %ld to %ld\n", 678 last_offset, -offset); 679 #endif 680 last_offset = -offset; 681 return first_guess - offset; 682 } else if (!check_before && !check_after) 683 return 0; 684 } 685 } 686 687 /* We did not find the pattern, dump out the hunk so they can handle it. */ 688 689 static void 690 abort_context_hunk(void) 691 { 692 LINENUM i; 693 const LINENUM pat_end = pch_end(); 694 /* 695 * add in last_offset to guess the same as the previous successful 696 * hunk 697 */ 698 const LINENUM oldfirst = pch_first() + last_offset; 699 const LINENUM newfirst = pch_newfirst() + last_offset; 700 const LINENUM oldlast = oldfirst + pch_ptrn_lines() - 1; 701 const LINENUM newlast = newfirst + pch_repl_lines() - 1; 702 const char *stars = (diff_type >= NEW_CONTEXT_DIFF ? " ****" : ""); 703 const char *minuses = (diff_type >= NEW_CONTEXT_DIFF ? " ----" : " -----"); 704 705 fprintf(rejfp, "***************\n"); 706 for (i = 0; i <= pat_end; i++) { 707 switch (pch_char(i)) { 708 case '*': 709 if (oldlast < oldfirst) 710 fprintf(rejfp, "*** 0%s\n", stars); 711 else if (oldlast == oldfirst) 712 fprintf(rejfp, "*** %ld%s\n", oldfirst, stars); 713 else 714 fprintf(rejfp, "*** %ld,%ld%s\n", oldfirst, 715 oldlast, stars); 716 break; 717 case '=': 718 if (newlast < newfirst) 719 fprintf(rejfp, "--- 0%s\n", minuses); 720 else if (newlast == newfirst) 721 fprintf(rejfp, "--- %ld%s\n", newfirst, minuses); 722 else 723 fprintf(rejfp, "--- %ld,%ld%s\n", newfirst, 724 newlast, minuses); 725 break; 726 case '\n': 727 fprintf(rejfp, "%s", pfetch(i)); 728 break; 729 case ' ': 730 case '-': 731 case '+': 732 case '!': 733 fprintf(rejfp, "%c %s", pch_char(i), pfetch(i)); 734 break; 735 default: 736 fatal("fatal internal error in abort_context_hunk\n"); 737 } 738 } 739 } 740 741 static void 742 rej_line(int ch, LINENUM i) 743 { 744 size_t len; 745 const char *line = pfetch(i); 746 747 len = strlen(line); 748 749 fprintf(rejfp, "%c%s", ch, line); 750 if (len == 0 || line[len-1] != '\n') 751 fprintf(rejfp, "\n\\ No newline at end of file\n"); 752 } 753 754 static void 755 abort_hunk(void) 756 { 757 LINENUM i, j, split; 758 int ch1, ch2; 759 const LINENUM pat_end = pch_end(); 760 const LINENUM oldfirst = pch_first() + last_offset; 761 const LINENUM newfirst = pch_newfirst() + last_offset; 762 763 if (diff_type != UNI_DIFF) { 764 abort_context_hunk(); 765 return; 766 } 767 split = -1; 768 for (i = 0; i <= pat_end; i++) { 769 if (pch_char(i) == '=') { 770 split = i; 771 break; 772 } 773 } 774 if (split == -1) { 775 fprintf(rejfp, "malformed hunk: no split found\n"); 776 return; 777 } 778 i = 0; 779 j = split + 1; 780 fprintf(rejfp, "@@ -%ld,%ld +%ld,%ld @@\n", 781 pch_ptrn_lines() ? oldfirst : 0, 782 pch_ptrn_lines(), newfirst, pch_repl_lines()); 783 while (i < split || j <= pat_end) { 784 ch1 = i < split ? pch_char(i) : -1; 785 ch2 = j <= pat_end ? pch_char(j) : -1; 786 if (ch1 == '-') { 787 rej_line('-', i); 788 i++; 789 } else if (ch1 == ' ' && ch2 == ' ') { 790 rej_line(' ', i); 791 i++; 792 j++; 793 } else if (ch1 == '!' && ch2 == '!') { 794 while (i < split && ch1 == '!') { 795 rej_line('-', i); 796 i++; 797 ch1 = i < split ? pch_char(i) : -1; 798 } 799 while (j <= pat_end && ch2 == '!') { 800 rej_line('+', j); 801 j++; 802 ch2 = j <= pat_end ? pch_char(j) : -1; 803 } 804 } else if (ch1 == '*') { 805 i++; 806 } else if (ch2 == '+' || ch2 == ' ') { 807 rej_line(ch2, j); 808 j++; 809 } else { 810 fprintf(rejfp, "internal error on (%ld %ld %ld)\n", 811 i, split, j); 812 rej_line(ch1, i); 813 rej_line(ch2, j); 814 return; 815 } 816 } 817 } 818 819 /* We found where to apply it (we hope), so do it. */ 820 821 static void 822 apply_hunk(LINENUM where) 823 { 824 LINENUM old = 1; 825 const LINENUM lastline = pch_ptrn_lines(); 826 LINENUM new = lastline + 1; 827 #define OUTSIDE 0 828 #define IN_IFNDEF 1 829 #define IN_IFDEF 2 830 #define IN_ELSE 3 831 int def_state = OUTSIDE; 832 const LINENUM pat_end = pch_end(); 833 834 where--; 835 while (pch_char(new) == '=' || pch_char(new) == '\n') 836 new++; 837 838 while (old <= lastline) { 839 if (pch_char(old) == '-') { 840 copy_till(where + old - 1, false); 841 if (do_defines) { 842 if (def_state == OUTSIDE) { 843 fputs(not_defined, ofp); 844 def_state = IN_IFNDEF; 845 } else if (def_state == IN_IFDEF) { 846 fputs(else_defined, ofp); 847 def_state = IN_ELSE; 848 } 849 fputs(pfetch(old), ofp); 850 } 851 last_frozen_line++; 852 old++; 853 } else if (new > pat_end) { 854 break; 855 } else if (pch_char(new) == '+') { 856 copy_till(where + old - 1, false); 857 if (do_defines) { 858 if (def_state == IN_IFNDEF) { 859 fputs(else_defined, ofp); 860 def_state = IN_ELSE; 861 } else if (def_state == OUTSIDE) { 862 fputs(if_defined, ofp); 863 def_state = IN_IFDEF; 864 } 865 } 866 fputs(pfetch(new), ofp); 867 new++; 868 } else if (pch_char(new) != pch_char(old)) { 869 say("Out-of-sync patch, lines %ld,%ld--mangled text or line numbers, maybe?\n", 870 pch_hunk_beg() + old, 871 pch_hunk_beg() + new); 872 #ifdef DEBUGGING 873 say("oldchar = '%c', newchar = '%c'\n", 874 pch_char(old), pch_char(new)); 875 #endif 876 my_exit(2); 877 } else if (pch_char(new) == '!') { 878 copy_till(where + old - 1, false); 879 if (do_defines) { 880 fputs(not_defined, ofp); 881 def_state = IN_IFNDEF; 882 } 883 while (pch_char(old) == '!') { 884 if (do_defines) { 885 fputs(pfetch(old), ofp); 886 } 887 last_frozen_line++; 888 old++; 889 } 890 if (do_defines) { 891 fputs(else_defined, ofp); 892 def_state = IN_ELSE; 893 } 894 while (pch_char(new) == '!') { 895 fputs(pfetch(new), ofp); 896 new++; 897 } 898 } else { 899 if (pch_char(new) != ' ') 900 fatal("Internal error: expected ' '\n"); 901 old++; 902 new++; 903 if (do_defines && def_state != OUTSIDE) { 904 fputs(end_defined, ofp); 905 def_state = OUTSIDE; 906 } 907 } 908 } 909 if (new <= pat_end && pch_char(new) == '+') { 910 copy_till(where + old - 1, false); 911 if (do_defines) { 912 if (def_state == OUTSIDE) { 913 fputs(if_defined, ofp); 914 def_state = IN_IFDEF; 915 } else if (def_state == IN_IFNDEF) { 916 fputs(else_defined, ofp); 917 def_state = IN_ELSE; 918 } 919 } 920 while (new <= pat_end && pch_char(new) == '+') { 921 fputs(pfetch(new), ofp); 922 new++; 923 } 924 } 925 if (do_defines && def_state != OUTSIDE) { 926 fputs(end_defined, ofp); 927 } 928 } 929 930 /* 931 * Open the new file. 932 */ 933 static void 934 init_output(const char *name) 935 { 936 ofp = fopen(name, "w"); 937 if (ofp == NULL) 938 pfatal("can't create %s", name); 939 } 940 941 /* 942 * Open a file to put hunks we can't locate. 943 */ 944 static void 945 init_reject(const char *name) 946 { 947 rejfp = fopen(name, "w"); 948 if (rejfp == NULL) 949 pfatal("can't create %s", name); 950 } 951 952 /* 953 * Copy input file to output, up to wherever hunk is to be applied. 954 * If endoffile is true, treat the last line specially since it may 955 * lack a newline. 956 */ 957 static void 958 copy_till(LINENUM lastline, bool endoffile) 959 { 960 if (last_frozen_line > lastline) 961 fatal("misordered hunks! output would be garbled\n"); 962 while (last_frozen_line < lastline) { 963 if (++last_frozen_line == lastline && endoffile) 964 dump_line(last_frozen_line, !last_line_missing_eol); 965 else 966 dump_line(last_frozen_line, true); 967 } 968 } 969 970 /* 971 * Finish copying the input file to the output file. 972 */ 973 static void 974 spew_output(void) 975 { 976 #ifdef DEBUGGING 977 if (debug & 256) 978 say("il=%ld lfl=%ld\n", input_lines, last_frozen_line); 979 #endif 980 if (input_lines) 981 copy_till(input_lines, true); /* dump remainder of file */ 982 fclose(ofp); 983 ofp = NULL; 984 } 985 986 /* 987 * Copy one line from input to output. 988 */ 989 static void 990 dump_line(LINENUM line, bool write_newline) 991 { 992 char *s; 993 994 s = ifetch(line, 0); 995 if (s == NULL) 996 return; 997 /* Note: string is not NUL terminated. */ 998 for (; *s != '\n'; s++) 999 putc(*s, ofp); 1000 if (write_newline) 1001 putc('\n', ofp); 1002 } 1003 1004 /* 1005 * Does the patch pattern match at line base+offset? 1006 */ 1007 static bool 1008 patch_match(LINENUM base, LINENUM offset, LINENUM fuzz) 1009 { 1010 LINENUM pline = 1 + fuzz; 1011 LINENUM iline; 1012 LINENUM pat_lines = pch_ptrn_lines() - fuzz; 1013 const char *ilineptr; 1014 const char *plineptr; 1015 short plinelen; 1016 1017 for (iline = base + offset + fuzz; pline <= pat_lines; pline++, iline++) { 1018 ilineptr = ifetch(iline, offset >= 0); 1019 if (ilineptr == NULL) 1020 return false; 1021 plineptr = pfetch(pline); 1022 plinelen = pch_line_len(pline); 1023 if (canonicalize) { 1024 if (!similar(ilineptr, plineptr, plinelen)) 1025 return false; 1026 } else if (strnNE(ilineptr, plineptr, plinelen)) 1027 return false; 1028 if (iline == input_lines) { 1029 /* 1030 * We are looking at the last line of the file. 1031 * If the file has no eol, the patch line should 1032 * not have one either and vice-versa. Note that 1033 * plinelen > 0. 1034 */ 1035 if (last_line_missing_eol) { 1036 if (plineptr[plinelen - 1] == '\n') 1037 return false; 1038 } else { 1039 if (plineptr[plinelen - 1] != '\n') 1040 return false; 1041 } 1042 } 1043 } 1044 return true; 1045 } 1046 1047 /* 1048 * Do two lines match with canonicalized white space? 1049 */ 1050 static bool 1051 similar(const char *a, const char *b, int len) 1052 { 1053 while (len) { 1054 if (isspace((unsigned char)*b)) { /* whitespace (or \n) to match? */ 1055 if (!isspace((unsigned char)*a)) 1056 return false; /* no corresponding whitespace */ 1057 while (len && isspace((unsigned char)*b) && *b != '\n') 1058 b++, len--; /* skip pattern whitespace */ 1059 while (isspace((unsigned char)*a) && *a != '\n') 1060 a++; /* skip target whitespace */ 1061 if (*a == '\n' || *b == '\n') 1062 return (*a == *b); /* should end in sync */ 1063 } else if (*a++ != *b++) /* match non-whitespace chars */ 1064 return false; 1065 else 1066 len--; /* probably not necessary */ 1067 } 1068 return true; /* actually, this is not reached */ 1069 /* since there is always a \n */ 1070 } 1071