1 /* $OpenBSD: patch.c,v 1.68 2019/06/28 13:35:02 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 <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[MAXLINELEN]; /* general purpose buffer */ 51 52 bool using_plan_a = true; /* try to keep everything in memory */ 53 bool out_of_mem = false; /* ran out of memory in plan a */ 54 55 #define MAXFILEC 2 56 57 char *filearg[MAXFILEC]; 58 bool ok_to_create_file = false; 59 char *outname = NULL; 60 char *origprae = NULL; 61 char *TMPOUTNAME; 62 char *TMPINNAME; 63 char *TMPREJNAME; 64 char *TMPPATNAME; 65 bool toutkeep = false; 66 bool trejkeep = false; 67 bool warn_on_invalid_line; 68 bool last_line_missing_eol; 69 70 #ifdef DEBUGGING 71 int debug = 0; 72 #endif 73 74 bool force = false; 75 bool batch = false; 76 bool verbose = true; 77 bool reverse = false; 78 bool noreverse = false; 79 bool skip_rest_of_patch = false; 80 int strippath = 957; 81 bool canonicalize = false; 82 bool check_only = false; 83 int diff_type = 0; 84 char *revision = NULL; /* prerequisite revision, if any */ 85 LINENUM input_lines = 0; /* how long is input file in lines */ 86 int posix = 0; /* strict POSIX mode? */ 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_context_hunk(void); 92 static void rej_line(int, 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 __dead 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[PATH_MAX]; 112 113 /* how many input lines have been irretractibly output */ 114 static LINENUM last_frozen_line = 0; 115 116 static int Argc; /* guess */ 117 static char **Argv; 118 static int Argc_last; /* for restarting plan_b */ 119 static char **Argv_last; 120 121 static FILE *ofp = NULL; /* output file pointer */ 122 static FILE *rejfp = NULL; /* reject file pointer */ 123 124 static int filec = 0; /* how many file arguments? */ 125 static LINENUM last_offset = 0; 126 static LINENUM maxfuzz = 2; 127 128 /* patch using ifdef, ifndef, etc. */ 129 static bool do_defines = false; 130 /* #ifdef xyzzy */ 131 static char if_defined[128]; 132 /* #ifndef xyzzy */ 133 static char not_defined[128]; 134 /* #else */ 135 static const char else_defined[] = "#else\n"; 136 /* #endif xyzzy */ 137 static char end_defined[128]; 138 139 140 /* Apply a set of diffs as appropriate. */ 141 142 int 143 main(int argc, char *argv[]) 144 { 145 int error = 0, hunk, failed, i, fd; 146 bool patch_seen; 147 LINENUM where = 0, newwhere, fuzz, mymaxfuzz; 148 const char *tmpdir; 149 char *v; 150 151 if (pledge("stdio rpath wpath cpath tmppath fattr", NULL) == -1) { 152 perror("pledge"); 153 my_exit(2); 154 } 155 156 setvbuf(stdout, NULL, _IOLBF, 0); 157 setvbuf(stderr, NULL, _IOLBF, 0); 158 for (i = 0; i < MAXFILEC; i++) 159 filearg[i] = NULL; 160 161 /* Cons up the names of the temporary files. */ 162 if ((tmpdir = getenv("TMPDIR")) == NULL || *tmpdir == '\0') 163 tmpdir = _PATH_TMP; 164 for (i = strlen(tmpdir) - 1; i > 0 && tmpdir[i] == '/'; i--) 165 ; 166 i++; 167 if (asprintf(&TMPOUTNAME, "%.*s/patchoXXXXXXXXXX", i, tmpdir) == -1) 168 fatal("cannot allocate memory"); 169 if ((fd = mkstemp(TMPOUTNAME)) == -1) 170 pfatal("can't create %s", TMPOUTNAME); 171 close(fd); 172 173 if (asprintf(&TMPINNAME, "%.*s/patchiXXXXXXXXXX", i, tmpdir) == -1) 174 fatal("cannot allocate memory"); 175 if ((fd = mkstemp(TMPINNAME)) == -1) 176 pfatal("can't create %s", TMPINNAME); 177 close(fd); 178 179 if (asprintf(&TMPREJNAME, "%.*s/patchrXXXXXXXXXX", i, tmpdir) == -1) 180 fatal("cannot allocate memory"); 181 if ((fd = mkstemp(TMPREJNAME)) == -1) 182 pfatal("can't create %s", TMPREJNAME); 183 close(fd); 184 185 if (asprintf(&TMPPATNAME, "%.*s/patchpXXXXXXXXXX", i, tmpdir) == -1) 186 fatal("cannot allocate memory"); 187 if ((fd = mkstemp(TMPPATNAME)) == -1) 188 pfatal("can't create %s", TMPPATNAME); 189 close(fd); 190 191 v = getenv("SIMPLE_BACKUP_SUFFIX"); 192 if (v) 193 simple_backup_suffix = v; 194 else 195 simple_backup_suffix = ORIGEXT; 196 197 /* parse switches */ 198 Argc = argc; 199 Argv = argv; 200 get_some_switches(); 201 202 if (backup_type == none) { 203 if ((v = getenv("PATCH_VERSION_CONTROL")) == NULL) 204 v = getenv("VERSION_CONTROL"); 205 if (v != NULL || !posix) 206 backup_type = get_version(v); /* OK to pass NULL. */ 207 } 208 209 /* make sure we clean up /tmp in case of disaster */ 210 set_signals(0); 211 212 patch_seen = false; 213 for (open_patch_file(filearg[1]); there_is_another_patch(); 214 reinitialize_almost_everything()) { 215 /* for each patch in patch file */ 216 217 patch_seen = true; 218 219 warn_on_invalid_line = true; 220 221 if (outname == NULL) 222 outname = xstrdup(filearg[0]); 223 224 /* initialize the patched file */ 225 if (!skip_rest_of_patch) 226 init_output(TMPOUTNAME); 227 228 /* initialize reject file */ 229 init_reject(TMPREJNAME); 230 231 /* find out where all the lines are */ 232 if (!skip_rest_of_patch) 233 scan_input(filearg[0]); 234 235 /* for ed script just up and do it and exit */ 236 if (diff_type == ED_DIFF) { 237 do_ed_script(); 238 continue; 239 } 240 241 /* from here on, open no standard i/o files, because malloc */ 242 /* might misfire and we can't catch it easily */ 243 244 /* apply each hunk of patch */ 245 hunk = 0; 246 failed = 0; 247 out_of_mem = false; 248 while (another_hunk()) { 249 hunk++; 250 fuzz = 0; 251 mymaxfuzz = pch_context(); 252 if (maxfuzz < mymaxfuzz) 253 mymaxfuzz = maxfuzz; 254 if (!skip_rest_of_patch) { 255 do { 256 where = locate_hunk(fuzz); 257 if (hunk == 1 && where == 0 && !force) { 258 /* dwim for reversed patch? */ 259 if (!pch_swap()) { 260 if (fuzz == 0) 261 say("Not enough memory to try swapped hunk! Assuming unswapped.\n"); 262 continue; 263 } 264 reverse = !reverse; 265 /* try again */ 266 where = locate_hunk(fuzz); 267 if (where == 0) { 268 /* didn't find it swapped */ 269 if (!pch_swap()) 270 /* put it back to normal */ 271 fatal("lost hunk on alloc error!\n"); 272 reverse = !reverse; 273 } else if (noreverse) { 274 if (!pch_swap()) 275 /* put it back to normal */ 276 fatal("lost hunk on alloc error!\n"); 277 reverse = !reverse; 278 say("Ignoring previously applied (or reversed) patch.\n"); 279 skip_rest_of_patch = true; 280 } else if (batch) { 281 if (verbose) 282 say("%seversed (or previously applied) patch detected! %s -R.", 283 reverse ? "R" : "Unr", 284 reverse ? "Assuming" : "Ignoring"); 285 } else { 286 ask("%seversed (or previously applied) patch detected! %s -R? [y] ", 287 reverse ? "R" : "Unr", 288 reverse ? "Assume" : "Ignore"); 289 if (*buf == 'n') { 290 ask("Apply anyway? [n] "); 291 if (*buf != 'y') 292 skip_rest_of_patch = true; 293 where = 0; 294 reverse = !reverse; 295 if (!pch_swap()) 296 /* put it back to normal */ 297 fatal("lost hunk on alloc error!\n"); 298 } 299 } 300 } 301 } while (!skip_rest_of_patch && where == 0 && 302 ++fuzz <= mymaxfuzz); 303 304 if (skip_rest_of_patch) { /* just got decided */ 305 fclose(ofp); 306 ofp = NULL; 307 } 308 } 309 newwhere = pch_newfirst() + last_offset; 310 if (skip_rest_of_patch) { 311 abort_hunk(); 312 failed++; 313 if (verbose) 314 say("Hunk #%d ignored at %ld.\n", 315 hunk, newwhere); 316 } else if (where == 0) { 317 abort_hunk(); 318 failed++; 319 if (verbose) 320 say("Hunk #%d failed at %ld.\n", 321 hunk, newwhere); 322 } else { 323 apply_hunk(where); 324 if (verbose) { 325 say("Hunk #%d succeeded at %ld", 326 hunk, newwhere); 327 if (fuzz != 0) 328 say(" with fuzz %ld", fuzz); 329 if (last_offset) 330 say(" (offset %ld line%s)", 331 last_offset, 332 last_offset == 1L ? "" : "s"); 333 say(".\n"); 334 } 335 } 336 } 337 338 if (out_of_mem && using_plan_a) { 339 Argc = Argc_last; 340 Argv = Argv_last; 341 say("\n\nRan out of memory using Plan A--trying again...\n\n"); 342 if (ofp) 343 fclose(ofp); 344 ofp = NULL; 345 if (rejfp) 346 fclose(rejfp); 347 rejfp = NULL; 348 continue; 349 } 350 if (hunk == 0) 351 fatal("Internal error: hunk should not be 0\n"); 352 353 /* finish spewing out the new file */ 354 if (!skip_rest_of_patch) 355 spew_output(); 356 357 /* and put the output where desired */ 358 ignore_signals(); 359 if (!skip_rest_of_patch) { 360 struct stat statbuf; 361 char *realout = outname; 362 363 if (!check_only) { 364 if (move_file(TMPOUTNAME, outname) < 0) { 365 toutkeep = true; 366 realout = TMPOUTNAME; 367 chmod(TMPOUTNAME, filemode); 368 } else 369 chmod(outname, filemode); 370 371 if (remove_empty_files && 372 stat(realout, &statbuf) == 0 && 373 statbuf.st_size == 0) { 374 if (verbose) 375 say("Removing %s (empty after patching).\n", 376 realout); 377 unlink(realout); 378 } 379 } 380 } 381 fclose(rejfp); 382 rejfp = NULL; 383 if (failed) { 384 error = 1; 385 if (*rejname == '\0') { 386 if (strlcpy(rejname, outname, 387 sizeof(rejname)) >= sizeof(rejname)) 388 fatal("filename %s is too long\n", outname); 389 if (strlcat(rejname, REJEXT, 390 sizeof(rejname)) >= sizeof(rejname)) 391 fatal("filename %s is too long\n", outname); 392 } 393 if (!check_only) 394 say("%d out of %d hunks %s--saving rejects to %s\n", 395 failed, hunk, skip_rest_of_patch ? "ignored" : "failed", rejname); 396 else 397 say("%d out of %d hunks %s\n", 398 failed, hunk, skip_rest_of_patch ? "ignored" : "failed"); 399 if (!check_only && move_file(TMPREJNAME, rejname) < 0) 400 trejkeep = true; 401 } 402 set_signals(1); 403 } 404 405 if (!patch_seen) 406 error = 2; 407 408 my_exit(error); 409 /* NOTREACHED */ 410 } 411 412 /* Prepare to find the next patch to do in the patch file. */ 413 414 static void 415 reinitialize_almost_everything(void) 416 { 417 re_patch(); 418 re_input(); 419 420 input_lines = 0; 421 last_frozen_line = 0; 422 423 filec = 0; 424 if (!out_of_mem) { 425 free(filearg[0]); 426 filearg[0] = NULL; 427 } 428 429 free(outname); 430 outname = NULL; 431 432 last_offset = 0; 433 diff_type = 0; 434 435 free(revision); 436 revision = NULL; 437 438 reverse = reverse_flag_specified; 439 skip_rest_of_patch = false; 440 441 get_some_switches(); 442 } 443 444 /* Process switches and filenames. */ 445 446 static void 447 get_some_switches(void) 448 { 449 const char *options = "b::B:cCd:D:eEfF:i:lnNo:p:r:RstuvV:x:z:"; 450 static struct option longopts[] = { 451 {"backup", no_argument, 0, 'b'}, 452 {"batch", no_argument, 0, 't'}, 453 {"check", no_argument, 0, 'C'}, 454 {"context", no_argument, 0, 'c'}, 455 {"debug", required_argument, 0, 'x'}, 456 {"directory", required_argument, 0, 'd'}, 457 {"dry-run", no_argument, 0, 'C'}, 458 {"ed", no_argument, 0, 'e'}, 459 {"force", no_argument, 0, 'f'}, 460 {"forward", no_argument, 0, 'N'}, 461 {"fuzz", required_argument, 0, 'F'}, 462 {"ifdef", required_argument, 0, 'D'}, 463 {"input", required_argument, 0, 'i'}, 464 {"ignore-whitespace", no_argument, 0, 'l'}, 465 {"normal", no_argument, 0, 'n'}, 466 {"output", required_argument, 0, 'o'}, 467 {"prefix", required_argument, 0, 'B'}, 468 {"quiet", no_argument, 0, 's'}, 469 {"reject-file", required_argument, 0, 'r'}, 470 {"remove-empty-files", no_argument, 0, 'E'}, 471 {"reverse", no_argument, 0, 'R'}, 472 {"silent", no_argument, 0, 's'}, 473 {"strip", required_argument, 0, 'p'}, 474 {"suffix", required_argument, 0, 'z'}, 475 {"unified", no_argument, 0, 'u'}, 476 {"version", no_argument, 0, 'v'}, 477 {"version-control", required_argument, 0, 'V'}, 478 {"posix", no_argument, &posix, 1}, 479 {NULL, 0, 0, 0} 480 }; 481 int ch; 482 483 rejname[0] = '\0'; 484 Argc_last = Argc; 485 Argv_last = Argv; 486 if (!Argc) 487 return; 488 optreset = optind = 1; 489 while ((ch = getopt_long(Argc, Argv, options, longopts, NULL)) != -1) { 490 switch (ch) { 491 case 'b': 492 if (backup_type == none) 493 backup_type = numbered_existing; 494 if (optarg == NULL) 495 break; 496 if (verbose) 497 say("Warning, the ``-b suffix'' option has been" 498 " obsoleted by the -z option.\n"); 499 /* FALLTHROUGH */ 500 case 'z': 501 /* must directly follow 'b' case for backwards compat */ 502 simple_backup_suffix = xstrdup(optarg); 503 break; 504 case 'B': 505 origprae = xstrdup(optarg); 506 break; 507 case 'c': 508 diff_type = CONTEXT_DIFF; 509 break; 510 case 'C': 511 check_only = true; 512 break; 513 case 'd': 514 if (chdir(optarg) == -1) 515 pfatal("can't cd to %s", optarg); 516 break; 517 case 'D': 518 do_defines = true; 519 if (!isalpha((unsigned char)*optarg) && *optarg != '_') 520 fatal("argument to -D is not an identifier\n"); 521 snprintf(if_defined, sizeof if_defined, 522 "#ifdef %s\n", optarg); 523 snprintf(not_defined, sizeof not_defined, 524 "#ifndef %s\n", optarg); 525 snprintf(end_defined, sizeof end_defined, 526 "#endif /* %s */\n", optarg); 527 break; 528 case 'e': 529 diff_type = ED_DIFF; 530 break; 531 case 'E': 532 remove_empty_files = true; 533 break; 534 case 'f': 535 force = true; 536 break; 537 case 'F': 538 maxfuzz = atoi(optarg); 539 break; 540 case 'i': 541 if (++filec == MAXFILEC) 542 fatal("too many file arguments\n"); 543 filearg[filec] = xstrdup(optarg); 544 break; 545 case 'l': 546 canonicalize = true; 547 break; 548 case 'n': 549 diff_type = NORMAL_DIFF; 550 break; 551 case 'N': 552 noreverse = true; 553 break; 554 case 'o': 555 outname = xstrdup(optarg); 556 break; 557 case 'p': 558 strippath = atoi(optarg); 559 break; 560 case 'r': 561 if (strlcpy(rejname, optarg, 562 sizeof(rejname)) >= sizeof(rejname)) 563 fatal("argument for -r is too long\n"); 564 break; 565 case 'R': 566 reverse = true; 567 reverse_flag_specified = true; 568 break; 569 case 's': 570 verbose = false; 571 break; 572 case 't': 573 batch = true; 574 break; 575 case 'u': 576 diff_type = UNI_DIFF; 577 break; 578 case 'v': 579 version(); 580 break; 581 case 'V': 582 backup_type = get_version(optarg); 583 break; 584 #ifdef DEBUGGING 585 case 'x': 586 debug = atoi(optarg); 587 break; 588 #endif 589 default: 590 if (ch != '\0') 591 usage(); 592 break; 593 } 594 } 595 Argc -= optind; 596 Argv += optind; 597 598 if (Argc > 0) { 599 filearg[0] = xstrdup(*Argv++); 600 Argc--; 601 while (Argc > 0) { 602 if (++filec == MAXFILEC) 603 fatal("too many file arguments\n"); 604 filearg[filec] = xstrdup(*Argv++); 605 Argc--; 606 } 607 } 608 609 if (getenv("POSIXLY_CORRECT") != NULL) 610 posix = 1; 611 } 612 613 static __dead void 614 usage(void) 615 { 616 fprintf(stderr, 617 "usage: patch [-bCcEeflNnRstuv] [-B backup-prefix] [-D symbol] [-d directory]\n" 618 " [-F max-fuzz] [-i patchfile] [-o out-file] [-p strip-count]\n" 619 " [-r rej-name] [-V t | nil | never] [-x number] [-z backup-ext]\n" 620 " [--posix] [origfile [patchfile]]\n" 621 " patch <patchfile\n"); 622 my_exit(2); 623 } 624 625 /* 626 * Attempt to find the right place to apply this hunk of patch. 627 */ 628 static LINENUM 629 locate_hunk(LINENUM fuzz) 630 { 631 LINENUM first_guess = pch_first() + last_offset; 632 LINENUM offset; 633 LINENUM pat_lines = pch_ptrn_lines(); 634 LINENUM max_pos_offset = input_lines - first_guess - pat_lines + 1; 635 LINENUM max_neg_offset = first_guess - last_frozen_line - 1 + pch_context(); 636 637 if (pat_lines == 0) { /* null range matches always */ 638 if (verbose && fuzz == 0 && (diff_type == CONTEXT_DIFF 639 || diff_type == NEW_CONTEXT_DIFF 640 || diff_type == UNI_DIFF)) { 641 say("Empty context always matches.\n"); 642 } 643 return (first_guess); 644 } 645 if (max_neg_offset >= first_guess) /* do not try lines < 0 */ 646 max_neg_offset = first_guess - 1; 647 if (first_guess <= input_lines && patch_match(first_guess, 0, fuzz)) 648 return first_guess; 649 for (offset = 1; ; offset++) { 650 bool check_after = (offset <= max_pos_offset); 651 bool check_before = (offset <= max_neg_offset); 652 653 if (check_after && patch_match(first_guess, offset, fuzz)) { 654 #ifdef DEBUGGING 655 if (debug & 1) 656 say("Offset changing from %ld to %ld\n", 657 last_offset, offset); 658 #endif 659 last_offset = offset; 660 return first_guess + offset; 661 } else if (check_before && patch_match(first_guess, -offset, fuzz)) { 662 #ifdef DEBUGGING 663 if (debug & 1) 664 say("Offset changing from %ld to %ld\n", 665 last_offset, -offset); 666 #endif 667 last_offset = -offset; 668 return first_guess - offset; 669 } else if (!check_before && !check_after) 670 return 0; 671 } 672 } 673 674 /* We did not find the pattern, dump out the hunk so they can handle it. */ 675 676 static void 677 abort_context_hunk(void) 678 { 679 LINENUM i; 680 const LINENUM pat_end = pch_end(); 681 /* 682 * add in last_offset to guess the same as the previous successful 683 * hunk 684 */ 685 const LINENUM oldfirst = pch_first() + last_offset; 686 const LINENUM newfirst = pch_newfirst() + last_offset; 687 const LINENUM oldlast = oldfirst + pch_ptrn_lines() - 1; 688 const LINENUM newlast = newfirst + pch_repl_lines() - 1; 689 const char *stars = (diff_type >= NEW_CONTEXT_DIFF ? " ****" : ""); 690 const char *minuses = (diff_type >= NEW_CONTEXT_DIFF ? " ----" : " -----"); 691 692 fprintf(rejfp, "***************\n"); 693 for (i = 0; i <= pat_end; i++) { 694 switch (pch_char(i)) { 695 case '*': 696 if (oldlast < oldfirst) 697 fprintf(rejfp, "*** 0%s\n", stars); 698 else if (oldlast == oldfirst) 699 fprintf(rejfp, "*** %ld%s\n", oldfirst, stars); 700 else 701 fprintf(rejfp, "*** %ld,%ld%s\n", oldfirst, 702 oldlast, stars); 703 break; 704 case '=': 705 if (newlast < newfirst) 706 fprintf(rejfp, "--- 0%s\n", minuses); 707 else if (newlast == newfirst) 708 fprintf(rejfp, "--- %ld%s\n", newfirst, minuses); 709 else 710 fprintf(rejfp, "--- %ld,%ld%s\n", newfirst, 711 newlast, minuses); 712 break; 713 case '\n': 714 fprintf(rejfp, "%s", pfetch(i)); 715 break; 716 case ' ': 717 case '-': 718 case '+': 719 case '!': 720 fprintf(rejfp, "%c %s", pch_char(i), pfetch(i)); 721 break; 722 default: 723 fatal("fatal internal error in abort_context_hunk\n"); 724 } 725 } 726 } 727 728 static void 729 rej_line(int ch, LINENUM i) 730 { 731 size_t len; 732 const char *line = pfetch(i); 733 734 len = strlen(line); 735 736 fprintf(rejfp, "%c%s", ch, line); 737 if (len == 0 || line[len-1] != '\n') 738 fprintf(rejfp, "\n\\ No newline at end of file\n"); 739 } 740 741 static void 742 abort_hunk(void) 743 { 744 LINENUM i, j, split; 745 int ch1, ch2; 746 const LINENUM pat_end = pch_end(); 747 const LINENUM oldfirst = pch_first() + last_offset; 748 const LINENUM newfirst = pch_newfirst() + last_offset; 749 750 if (diff_type != UNI_DIFF) { 751 abort_context_hunk(); 752 return; 753 } 754 split = -1; 755 for (i = 0; i <= pat_end; i++) { 756 if (pch_char(i) == '=') { 757 split = i; 758 break; 759 } 760 } 761 if (split == -1) { 762 fprintf(rejfp, "malformed hunk: no split found\n"); 763 return; 764 } 765 i = 0; 766 j = split + 1; 767 fprintf(rejfp, "@@ -%ld,%ld +%ld,%ld @@\n", 768 pch_ptrn_lines() ? oldfirst : 0, 769 pch_ptrn_lines(), newfirst, pch_repl_lines()); 770 while (i < split || j <= pat_end) { 771 ch1 = i < split ? pch_char(i) : -1; 772 ch2 = j <= pat_end ? pch_char(j) : -1; 773 if (ch1 == '-') { 774 rej_line('-', i); 775 i++; 776 } else if (ch1 == ' ' && ch2 == ' ') { 777 rej_line(' ', i); 778 i++; 779 j++; 780 } else if (ch1 == '!' && ch2 == '!') { 781 while (i < split && ch1 == '!') { 782 rej_line('-', i); 783 i++; 784 ch1 = i < split ? pch_char(i) : -1; 785 } 786 while (j <= pat_end && ch2 == '!') { 787 rej_line('+', j); 788 j++; 789 ch2 = j <= pat_end ? pch_char(j) : -1; 790 } 791 } else if (ch1 == '*') { 792 i++; 793 } else if (ch2 == '+' || ch2 == ' ') { 794 rej_line(ch2, j); 795 j++; 796 } else { 797 fprintf(rejfp, "internal error on (%ld %ld %ld)\n", 798 i, split, j); 799 rej_line(ch1, i); 800 rej_line(ch2, j); 801 return; 802 } 803 } 804 } 805 806 /* We found where to apply it (we hope), so do it. */ 807 808 static void 809 apply_hunk(LINENUM where) 810 { 811 LINENUM old = 1; 812 const LINENUM lastline = pch_ptrn_lines(); 813 LINENUM new = lastline + 1; 814 #define OUTSIDE 0 815 #define IN_IFNDEF 1 816 #define IN_IFDEF 2 817 #define IN_ELSE 3 818 int def_state = OUTSIDE; 819 const LINENUM pat_end = pch_end(); 820 821 where--; 822 while (pch_char(new) == '=' || pch_char(new) == '\n') 823 new++; 824 825 while (old <= lastline) { 826 if (pch_char(old) == '-') { 827 copy_till(where + old - 1, false); 828 if (do_defines) { 829 if (def_state == OUTSIDE) { 830 fputs(not_defined, ofp); 831 def_state = IN_IFNDEF; 832 } else if (def_state == IN_IFDEF) { 833 fputs(else_defined, ofp); 834 def_state = IN_ELSE; 835 } 836 fputs(pfetch(old), ofp); 837 } 838 last_frozen_line++; 839 old++; 840 } else if (new > pat_end) { 841 break; 842 } else if (pch_char(new) == '+') { 843 copy_till(where + old - 1, false); 844 if (do_defines) { 845 if (def_state == IN_IFNDEF) { 846 fputs(else_defined, ofp); 847 def_state = IN_ELSE; 848 } else if (def_state == OUTSIDE) { 849 fputs(if_defined, ofp); 850 def_state = IN_IFDEF; 851 } 852 } 853 fputs(pfetch(new), ofp); 854 new++; 855 } else if (pch_char(new) != pch_char(old)) { 856 say("Out-of-sync patch, lines %ld,%ld--mangled text or line numbers, maybe?\n", 857 pch_hunk_beg() + old, 858 pch_hunk_beg() + new); 859 #ifdef DEBUGGING 860 say("oldchar = '%c', newchar = '%c'\n", 861 pch_char(old), pch_char(new)); 862 #endif 863 my_exit(2); 864 } else if (pch_char(new) == '!') { 865 copy_till(where + old - 1, false); 866 if (do_defines) { 867 fputs(not_defined, ofp); 868 def_state = IN_IFNDEF; 869 } 870 while (pch_char(old) == '!') { 871 if (do_defines) { 872 fputs(pfetch(old), ofp); 873 } 874 last_frozen_line++; 875 old++; 876 } 877 if (do_defines) { 878 fputs(else_defined, ofp); 879 def_state = IN_ELSE; 880 } 881 while (pch_char(new) == '!') { 882 fputs(pfetch(new), ofp); 883 new++; 884 } 885 } else { 886 if (pch_char(new) != ' ') 887 fatal("Internal error: expected ' '\n"); 888 old++; 889 new++; 890 if (do_defines && def_state != OUTSIDE) { 891 fputs(end_defined, ofp); 892 def_state = OUTSIDE; 893 } 894 } 895 } 896 if (new <= pat_end && pch_char(new) == '+') { 897 copy_till(where + old - 1, false); 898 if (do_defines) { 899 if (def_state == OUTSIDE) { 900 fputs(if_defined, ofp); 901 def_state = IN_IFDEF; 902 } else if (def_state == IN_IFNDEF) { 903 fputs(else_defined, ofp); 904 def_state = IN_ELSE; 905 } 906 } 907 while (new <= pat_end && pch_char(new) == '+') { 908 fputs(pfetch(new), ofp); 909 new++; 910 } 911 } 912 if (do_defines && def_state != OUTSIDE) { 913 fputs(end_defined, ofp); 914 } 915 } 916 917 /* 918 * Open the new file. 919 */ 920 static void 921 init_output(const char *name) 922 { 923 ofp = fopen(name, "w"); 924 if (ofp == NULL) 925 pfatal("can't create %s", name); 926 } 927 928 /* 929 * Open a file to put hunks we can't locate. 930 */ 931 static void 932 init_reject(const char *name) 933 { 934 rejfp = fopen(name, "w"); 935 if (rejfp == NULL) 936 pfatal("can't create %s", name); 937 } 938 939 /* 940 * Copy input file to output, up to wherever hunk is to be applied. 941 * If endoffile is true, treat the last line specially since it may 942 * lack a newline. 943 */ 944 static void 945 copy_till(LINENUM lastline, bool endoffile) 946 { 947 if (last_frozen_line > lastline) 948 fatal("misordered hunks! output would be garbled\n"); 949 while (last_frozen_line < lastline) { 950 if (++last_frozen_line == lastline && endoffile) 951 dump_line(last_frozen_line, !last_line_missing_eol); 952 else 953 dump_line(last_frozen_line, true); 954 } 955 } 956 957 /* 958 * Finish copying the input file to the output file. 959 */ 960 static void 961 spew_output(void) 962 { 963 #ifdef DEBUGGING 964 if (debug & 256) 965 say("il=%ld lfl=%ld\n", input_lines, last_frozen_line); 966 #endif 967 if (input_lines) 968 copy_till(input_lines, true); /* dump remainder of file */ 969 fclose(ofp); 970 ofp = NULL; 971 } 972 973 /* 974 * Copy one line from input to output. 975 */ 976 static void 977 dump_line(LINENUM line, bool write_newline) 978 { 979 char *s; 980 981 s = ifetch(line, 0); 982 if (s == NULL) 983 return; 984 /* Note: string is not NUL terminated. */ 985 for (; *s != '\n'; s++) 986 putc(*s, ofp); 987 if (write_newline) 988 putc('\n', ofp); 989 } 990 991 /* 992 * Does the patch pattern match at line base+offset? 993 */ 994 static bool 995 patch_match(LINENUM base, LINENUM offset, LINENUM fuzz) 996 { 997 LINENUM pline = 1 + fuzz; 998 LINENUM iline; 999 LINENUM pat_lines = pch_ptrn_lines() - fuzz; 1000 const char *ilineptr; 1001 const char *plineptr; 1002 short plinelen; 1003 1004 for (iline = base + offset + fuzz; pline <= pat_lines; pline++, iline++) { 1005 ilineptr = ifetch(iline, offset >= 0); 1006 if (ilineptr == NULL) 1007 return false; 1008 plineptr = pfetch(pline); 1009 plinelen = pch_line_len(pline); 1010 if (canonicalize) { 1011 if (!similar(ilineptr, plineptr, plinelen)) 1012 return false; 1013 } else if (strnNE(ilineptr, plineptr, plinelen)) 1014 return false; 1015 if (iline == input_lines) { 1016 /* 1017 * We are looking at the last line of the file. 1018 * If the file has no eol, the patch line should 1019 * not have one either and vice-versa. Note that 1020 * plinelen > 0. 1021 */ 1022 if (last_line_missing_eol) { 1023 if (plineptr[plinelen - 1] == '\n') 1024 return false; 1025 } else { 1026 if (plineptr[plinelen - 1] != '\n') 1027 return false; 1028 } 1029 } 1030 } 1031 return true; 1032 } 1033 1034 /* 1035 * Do two lines match with canonicalized white space? 1036 */ 1037 static bool 1038 similar(const char *a, const char *b, int len) 1039 { 1040 while (len) { 1041 if (isspace((unsigned char)*b)) { /* whitespace (or \n) to match? */ 1042 if (!isspace((unsigned char)*a)) 1043 return false; /* no corresponding whitespace */ 1044 while (len && isspace((unsigned char)*b) && *b != '\n') 1045 b++, len--; /* skip pattern whitespace */ 1046 while (isspace((unsigned char)*a) && *a != '\n') 1047 a++; /* skip target whitespace */ 1048 if (*a == '\n' || *b == '\n') 1049 return (*a == *b); /* should end in sync */ 1050 } else if (*a++ != *b++) /* match non-whitespace chars */ 1051 return false; 1052 else 1053 len--; /* probably not necessary */ 1054 } 1055 return true; /* actually, this is not reached */ 1056 /* since there is always a \n */ 1057 } 1058