1 /*- 2 * Copyright 1986, Larry Wall 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following condition is met: 6 * 1. Redistributions of source code must retain the above copyright notice, 7 * this condition and the following disclaimer. 8 * 9 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY 10 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 11 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 12 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR 13 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 14 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 15 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 16 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 17 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 18 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 19 * SUCH DAMAGE. 20 * 21 * patch - a program to apply diffs to original files 22 * 23 * -C option added in 1998, original code by Marc Espie, based on FreeBSD 24 * behaviour 25 * 26 * $OpenBSD: patch.c,v 1.50 2012/05/15 19:32:02 millert Exp $ 27 * $FreeBSD$ 28 * 29 */ 30 31 #include <sys/types.h> 32 #include <sys/stat.h> 33 34 #include <ctype.h> 35 #include <getopt.h> 36 #include <limits.h> 37 #include <stdio.h> 38 #include <string.h> 39 #include <stdlib.h> 40 #include <unistd.h> 41 42 #include "common.h" 43 #include "util.h" 44 #include "pch.h" 45 #include "inp.h" 46 #include "backupfile.h" 47 #include "pathnames.h" 48 49 mode_t filemode = 0644; 50 51 char *buf; /* general purpose buffer */ 52 size_t buf_size; /* size of the 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_context_hunk(void); 94 static void rej_line(int, LINENUM); 95 static void abort_hunk(void); 96 static void apply_hunk(LINENUM); 97 static void init_output(const char *); 98 static void init_reject(const char *); 99 static void copy_till(LINENUM, bool); 100 static bool spew_output(void); 101 static void dump_line(LINENUM, bool); 102 static bool patch_match(LINENUM, LINENUM, LINENUM); 103 static bool similar(const char *, const char *, int); 104 static void usage(void); 105 106 /* true if -E was specified on command line. */ 107 static bool remove_empty_files = false; 108 109 /* true if -R was specified on command line. */ 110 static bool reverse_flag_specified = false; 111 112 /* buffer holding the name of the rejected patch file. */ 113 static char rejname[NAME_MAX + 1]; 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 setlinebuf(stdout); 154 setlinebuf(stderr); 155 for (i = 0; i < MAXFILEC; i++) 156 filearg[i] = NULL; 157 158 buf_size = INITLINELEN; 159 buf = malloc((unsigned)(buf_size)); 160 if (buf == NULL) 161 fatal("out of memory\n"); 162 163 /* Cons up the names of the temporary files. */ 164 if ((tmpdir = getenv("TMPDIR")) == NULL || *tmpdir == '\0') 165 tmpdir = _PATH_TMP; 166 for (i = strlen(tmpdir) - 1; i > 0 && tmpdir[i] == '/'; i--) 167 ; 168 i++; 169 if (asprintf(&TMPOUTNAME, "%.*s/patchoXXXXXXXXXX", i, tmpdir) == -1) 170 fatal("cannot allocate memory"); 171 if ((fd = mkstemp(TMPOUTNAME)) < 0) 172 pfatal("can't create %s", TMPOUTNAME); 173 close(fd); 174 175 if (asprintf(&TMPINNAME, "%.*s/patchiXXXXXXXXXX", i, tmpdir) == -1) 176 fatal("cannot allocate memory"); 177 if ((fd = mkstemp(TMPINNAME)) < 0) 178 pfatal("can't create %s", TMPINNAME); 179 close(fd); 180 181 if (asprintf(&TMPREJNAME, "%.*s/patchrXXXXXXXXXX", i, tmpdir) == -1) 182 fatal("cannot allocate memory"); 183 if ((fd = mkstemp(TMPREJNAME)) < 0) 184 pfatal("can't create %s", TMPREJNAME); 185 close(fd); 186 187 if (asprintf(&TMPPATNAME, "%.*s/patchpXXXXXXXXXX", i, tmpdir) == -1) 188 fatal("cannot allocate memory"); 189 if ((fd = mkstemp(TMPPATNAME)) < 0) 190 pfatal("can't create %s", TMPPATNAME); 191 close(fd); 192 193 v = getenv("SIMPLE_BACKUP_SUFFIX"); 194 if (v) 195 simple_backup_suffix = v; 196 else 197 simple_backup_suffix = ORIGEXT; 198 199 /* parse switches */ 200 Argc = argc; 201 Argv = argv; 202 get_some_switches(); 203 204 if (backup_type == none) { 205 if ((v = getenv("PATCH_VERSION_CONTROL")) == NULL) 206 v = getenv("VERSION_CONTROL"); 207 if (v != NULL || !posix) 208 backup_type = get_version(v); /* OK to pass NULL. */ 209 } 210 211 /* make sure we clean up /tmp in case of disaster */ 212 set_signals(0); 213 214 patch_seen = false; 215 for (open_patch_file(filearg[1]); there_is_another_patch(); 216 reinitialize_almost_everything()) { 217 /* for each patch in patch file */ 218 219 patch_seen = true; 220 221 warn_on_invalid_line = true; 222 223 if (outname == NULL) 224 outname = savestr(filearg[0]); 225 226 /* for ed script just up and do it and exit */ 227 if (diff_type == ED_DIFF) { 228 do_ed_script(); 229 continue; 230 } 231 /* initialize the patched file */ 232 if (!skip_rest_of_patch) 233 init_output(TMPOUTNAME); 234 235 /* initialize reject file */ 236 init_reject(TMPREJNAME); 237 238 /* find out where all the lines are */ 239 if (!skip_rest_of_patch) 240 scan_input(filearg[0]); 241 242 /* 243 * from here on, open no standard i/o files, because 244 * malloc might misfire and we can't catch it easily 245 */ 246 247 /* apply each hunk of patch */ 248 hunk = 0; 249 failed = 0; 250 out_of_mem = false; 251 while (another_hunk()) { 252 hunk++; 253 fuzz = 0; 254 mymaxfuzz = pch_context(); 255 if (maxfuzz < mymaxfuzz) 256 mymaxfuzz = maxfuzz; 257 if (!skip_rest_of_patch) { 258 do { 259 where = locate_hunk(fuzz); 260 if (hunk == 1 && where == 0 && !force) { 261 /* dwim for reversed patch? */ 262 if (!pch_swap()) { 263 if (fuzz == 0) 264 say("Not enough memory to try swapped hunk! Assuming unswapped.\n"); 265 continue; 266 } 267 reverse = !reverse; 268 /* try again */ 269 where = locate_hunk(fuzz); 270 if (where == 0) { 271 /* didn't find it swapped */ 272 if (!pch_swap()) 273 /* put it back to normal */ 274 fatal("lost hunk on alloc error!\n"); 275 reverse = !reverse; 276 } else if (noreverse) { 277 if (!pch_swap()) 278 /* put it back to normal */ 279 fatal("lost hunk on alloc error!\n"); 280 reverse = !reverse; 281 say("Ignoring previously applied (or reversed) patch.\n"); 282 skip_rest_of_patch = true; 283 } else if (batch) { 284 if (verbose) 285 say("%seversed (or previously applied) patch detected! %s -R.", 286 reverse ? "R" : "Unr", 287 reverse ? "Assuming" : "Ignoring"); 288 } else { 289 ask("%seversed (or previously applied) patch detected! %s -R? [y] ", 290 reverse ? "R" : "Unr", 291 reverse ? "Assume" : "Ignore"); 292 if (*buf == 'n') { 293 ask("Apply anyway? [n] "); 294 if (*buf != 'y') 295 skip_rest_of_patch = true; 296 where = 0; 297 reverse = !reverse; 298 if (!pch_swap()) 299 /* put it back to normal */ 300 fatal("lost hunk on alloc error!\n"); 301 } 302 } 303 } 304 } while (!skip_rest_of_patch && where == 0 && 305 ++fuzz <= mymaxfuzz); 306 307 if (skip_rest_of_patch) { /* just got decided */ 308 if (ferror(ofp) || fclose(ofp)) { 309 say("Error writing %s\n", 310 TMPOUTNAME); 311 error = 1; 312 } 313 ofp = NULL; 314 } 315 } 316 newwhere = pch_newfirst() + last_offset; 317 if (skip_rest_of_patch) { 318 abort_hunk(); 319 failed++; 320 if (verbose) 321 say("Hunk #%d ignored at %ld.\n", 322 hunk, newwhere); 323 } else if (where == 0) { 324 abort_hunk(); 325 failed++; 326 if (verbose) 327 say("Hunk #%d failed at %ld.\n", 328 hunk, newwhere); 329 } else { 330 apply_hunk(where); 331 if (verbose) { 332 say("Hunk #%d succeeded at %ld", 333 hunk, newwhere); 334 if (fuzz != 0) 335 say(" with fuzz %ld", fuzz); 336 if (last_offset) 337 say(" (offset %ld line%s)", 338 last_offset, 339 last_offset == 1L ? "" : "s"); 340 say(".\n"); 341 } 342 } 343 } 344 345 if (out_of_mem && using_plan_a) { 346 Argc = Argc_last; 347 Argv = Argv_last; 348 say("\n\nRan out of memory using Plan A--trying again...\n\n"); 349 if (ofp) 350 fclose(ofp); 351 ofp = NULL; 352 if (rejfp) 353 fclose(rejfp); 354 rejfp = NULL; 355 continue; 356 } 357 if (hunk == 0) 358 fatal("Internal error: hunk should not be 0\n"); 359 360 /* finish spewing out the new file */ 361 if (!skip_rest_of_patch && !spew_output()) { 362 say("Can't write %s\n", TMPOUTNAME); 363 error = 1; 364 } 365 366 /* and put the output where desired */ 367 ignore_signals(); 368 if (!skip_rest_of_patch) { 369 struct stat statbuf; 370 char *realout = outname; 371 372 if (!check_only) { 373 if (move_file(TMPOUTNAME, outname) < 0) { 374 toutkeep = true; 375 realout = TMPOUTNAME; 376 chmod(TMPOUTNAME, filemode); 377 } else 378 chmod(outname, filemode); 379 380 if (remove_empty_files && 381 stat(realout, &statbuf) == 0 && 382 statbuf.st_size == 0) { 383 if (verbose) 384 say("Removing %s (empty after patching).\n", 385 realout); 386 unlink(realout); 387 } 388 } 389 } 390 if (ferror(rejfp) || fclose(rejfp)) { 391 say("Error writing %s\n", rejname); 392 error = 1; 393 } 394 rejfp = NULL; 395 if (failed) { 396 error = 1; 397 if (*rejname == '\0') { 398 if (strlcpy(rejname, outname, 399 sizeof(rejname)) >= sizeof(rejname)) 400 fatal("filename %s is too long\n", outname); 401 if (strlcat(rejname, REJEXT, 402 sizeof(rejname)) >= sizeof(rejname)) 403 fatal("filename %s is too long\n", outname); 404 } 405 if (!check_only) 406 say("%d out of %d hunks %s--saving rejects to %s\n", 407 failed, hunk, skip_rest_of_patch ? "ignored" : "failed", rejname); 408 else 409 say("%d out of %d hunks %s\n", 410 failed, hunk, skip_rest_of_patch ? "ignored" : "failed"); 411 if (!check_only && move_file(TMPREJNAME, rejname) < 0) 412 trejkeep = true; 413 } 414 set_signals(1); 415 } 416 417 if (!patch_seen) 418 error = 2; 419 420 my_exit(error); 421 /* NOTREACHED */ 422 } 423 424 /* Prepare to find the next patch to do in the patch file. */ 425 426 static void 427 reinitialize_almost_everything(void) 428 { 429 re_patch(); 430 re_input(); 431 432 input_lines = 0; 433 last_frozen_line = 0; 434 435 filec = 0; 436 if (!out_of_mem) { 437 free(filearg[0]); 438 filearg[0] = NULL; 439 } 440 441 free(outname); 442 outname = NULL; 443 444 last_offset = 0; 445 diff_type = 0; 446 447 free(revision); 448 revision = NULL; 449 450 reverse = reverse_flag_specified; 451 skip_rest_of_patch = false; 452 453 get_some_switches(); 454 } 455 456 /* Process switches and filenames. */ 457 458 static void 459 get_some_switches(void) 460 { 461 const char *options = "b::B:cCd:D:eEfF:i:lnNo:p:r:RstuvV:x:z:"; 462 static struct option longopts[] = { 463 {"backup", no_argument, 0, 'b'}, 464 {"batch", no_argument, 0, 't'}, 465 {"check", no_argument, 0, 'C'}, 466 {"context", no_argument, 0, 'c'}, 467 {"debug", required_argument, 0, 'x'}, 468 {"directory", required_argument, 0, 'd'}, 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 = savestr(optarg); 514 break; 515 case 'B': 516 origprae = savestr(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) < 0) 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] = savestr(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 = savestr(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] = savestr(*Argv++); 611 Argc--; 612 while (Argc > 0) { 613 if (++filec == MAXFILEC) 614 fatal("too many file arguments\n"); 615 filearg[filec] = savestr(*Argv++); 616 Argc--; 617 } 618 } 619 620 if (getenv("POSIXLY_CORRECT") != NULL) 621 posix = 1; 622 } 623 624 static 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(EXIT_SUCCESS); 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 return (first_guess); 655 } 656 if (max_neg_offset >= first_guess) /* do not try lines < 0 */ 657 max_neg_offset = first_guess - 1; 658 if (first_guess <= input_lines && patch_match(first_guess, 0, fuzz)) 659 return first_guess; 660 for (offset = 1; ; offset++) { 661 bool check_after = (offset <= max_pos_offset); 662 bool check_before = (offset <= max_neg_offset); 663 664 if (check_after && patch_match(first_guess, offset, fuzz)) { 665 #ifdef DEBUGGING 666 if (debug & 1) 667 say("Offset changing from %ld to %ld\n", 668 last_offset, offset); 669 #endif 670 last_offset = offset; 671 return first_guess + offset; 672 } else if (check_before && patch_match(first_guess, -offset, fuzz)) { 673 #ifdef DEBUGGING 674 if (debug & 1) 675 say("Offset changing from %ld to %ld\n", 676 last_offset, -offset); 677 #endif 678 last_offset = -offset; 679 return first_guess - offset; 680 } else if (!check_before && !check_after) 681 return 0; 682 } 683 } 684 685 /* We did not find the pattern, dump out the hunk so they can handle it. */ 686 687 static void 688 abort_context_hunk(void) 689 { 690 LINENUM i; 691 const LINENUM pat_end = pch_end(); 692 /* 693 * add in last_offset to guess the same as the previous successful 694 * hunk 695 */ 696 const LINENUM oldfirst = pch_first() + last_offset; 697 const LINENUM newfirst = pch_newfirst() + last_offset; 698 const LINENUM oldlast = oldfirst + pch_ptrn_lines() - 1; 699 const LINENUM newlast = newfirst + pch_repl_lines() - 1; 700 const char *stars = (diff_type >= NEW_CONTEXT_DIFF ? " ****" : ""); 701 const char *minuses = (diff_type >= NEW_CONTEXT_DIFF ? " ----" : " -----"); 702 703 fprintf(rejfp, "***************\n"); 704 for (i = 0; i <= pat_end; i++) { 705 switch (pch_char(i)) { 706 case '*': 707 if (oldlast < oldfirst) 708 fprintf(rejfp, "*** 0%s\n", stars); 709 else if (oldlast == oldfirst) 710 fprintf(rejfp, "*** %ld%s\n", oldfirst, stars); 711 else 712 fprintf(rejfp, "*** %ld,%ld%s\n", oldfirst, 713 oldlast, stars); 714 break; 715 case '=': 716 if (newlast < newfirst) 717 fprintf(rejfp, "--- 0%s\n", minuses); 718 else if (newlast == newfirst) 719 fprintf(rejfp, "--- %ld%s\n", newfirst, minuses); 720 else 721 fprintf(rejfp, "--- %ld,%ld%s\n", newfirst, 722 newlast, minuses); 723 break; 724 case '\n': 725 fprintf(rejfp, "%s", pfetch(i)); 726 break; 727 case ' ': 728 case '-': 729 case '+': 730 case '!': 731 fprintf(rejfp, "%c %s", pch_char(i), pfetch(i)); 732 break; 733 default: 734 fatal("fatal internal error in abort_context_hunk\n"); 735 } 736 } 737 } 738 739 static void 740 rej_line(int ch, LINENUM i) 741 { 742 size_t len; 743 const char *line = pfetch(i); 744 745 len = strlen(line); 746 747 fprintf(rejfp, "%c%s", ch, line); 748 if (len == 0 || line[len-1] != '\n') 749 fprintf(rejfp, "\n\\ No newline at end of file\n"); 750 } 751 752 static void 753 abort_hunk(void) 754 { 755 LINENUM i, j, split; 756 int ch1, ch2; 757 const LINENUM pat_end = pch_end(); 758 const LINENUM oldfirst = pch_first() + last_offset; 759 const LINENUM newfirst = pch_newfirst() + last_offset; 760 761 if (diff_type != UNI_DIFF) { 762 abort_context_hunk(); 763 return; 764 } 765 split = -1; 766 for (i = 0; i <= pat_end; i++) { 767 if (pch_char(i) == '=') { 768 split = i; 769 break; 770 } 771 } 772 if (split == -1) { 773 fprintf(rejfp, "malformed hunk: no split found\n"); 774 return; 775 } 776 i = 0; 777 j = split + 1; 778 fprintf(rejfp, "@@ -%ld,%ld +%ld,%ld @@\n", 779 pch_ptrn_lines() ? oldfirst : 0, 780 pch_ptrn_lines(), newfirst, pch_repl_lines()); 781 while (i < split || j <= pat_end) { 782 ch1 = i < split ? pch_char(i) : -1; 783 ch2 = j <= pat_end ? pch_char(j) : -1; 784 if (ch1 == '-') { 785 rej_line('-', i); 786 i++; 787 } else if (ch1 == ' ' && ch2 == ' ') { 788 rej_line(' ', i); 789 i++; 790 j++; 791 } else if (ch1 == '!' && ch2 == '!') { 792 while (i < split && ch1 == '!') { 793 rej_line('-', i); 794 i++; 795 ch1 = i < split ? pch_char(i) : -1; 796 } 797 while (j <= pat_end && ch2 == '!') { 798 rej_line('+', j); 799 j++; 800 ch2 = j <= pat_end ? pch_char(j) : -1; 801 } 802 } else if (ch1 == '*') { 803 i++; 804 } else if (ch2 == '+' || ch2 == ' ') { 805 rej_line(ch2, j); 806 j++; 807 } else { 808 fprintf(rejfp, "internal error on (%ld %ld %ld)\n", 809 i, split, j); 810 rej_line(ch1, i); 811 rej_line(ch2, j); 812 return; 813 } 814 } 815 } 816 817 /* We found where to apply it (we hope), so do it. */ 818 819 static void 820 apply_hunk(LINENUM where) 821 { 822 LINENUM old = 1; 823 const LINENUM lastline = pch_ptrn_lines(); 824 LINENUM new = lastline + 1; 825 #define OUTSIDE 0 826 #define IN_IFNDEF 1 827 #define IN_IFDEF 2 828 #define IN_ELSE 3 829 int def_state = OUTSIDE; 830 const LINENUM pat_end = pch_end(); 831 832 where--; 833 while (pch_char(new) == '=' || pch_char(new) == '\n') 834 new++; 835 836 while (old <= lastline) { 837 if (pch_char(old) == '-') { 838 copy_till(where + old - 1, false); 839 if (do_defines) { 840 if (def_state == OUTSIDE) { 841 fputs(not_defined, ofp); 842 def_state = IN_IFNDEF; 843 } else if (def_state == IN_IFDEF) { 844 fputs(else_defined, ofp); 845 def_state = IN_ELSE; 846 } 847 fputs(pfetch(old), ofp); 848 } 849 last_frozen_line++; 850 old++; 851 } else if (new > pat_end) { 852 break; 853 } else if (pch_char(new) == '+') { 854 copy_till(where + old - 1, false); 855 if (do_defines) { 856 if (def_state == IN_IFNDEF) { 857 fputs(else_defined, ofp); 858 def_state = IN_ELSE; 859 } else if (def_state == OUTSIDE) { 860 fputs(if_defined, ofp); 861 def_state = IN_IFDEF; 862 } 863 } 864 fputs(pfetch(new), ofp); 865 new++; 866 } else if (pch_char(new) != pch_char(old)) { 867 say("Out-of-sync patch, lines %ld,%ld--mangled text or line numbers, maybe?\n", 868 pch_hunk_beg() + old, 869 pch_hunk_beg() + new); 870 #ifdef DEBUGGING 871 say("oldchar = '%c', newchar = '%c'\n", 872 pch_char(old), pch_char(new)); 873 #endif 874 my_exit(2); 875 } else if (pch_char(new) == '!') { 876 copy_till(where + old - 1, false); 877 if (do_defines) { 878 fputs(not_defined, ofp); 879 def_state = IN_IFNDEF; 880 } 881 while (pch_char(old) == '!') { 882 if (do_defines) { 883 fputs(pfetch(old), ofp); 884 } 885 last_frozen_line++; 886 old++; 887 } 888 if (do_defines) { 889 fputs(else_defined, ofp); 890 def_state = IN_ELSE; 891 } 892 while (pch_char(new) == '!') { 893 fputs(pfetch(new), ofp); 894 new++; 895 } 896 } else { 897 if (pch_char(new) != ' ') 898 fatal("Internal error: expected ' '\n"); 899 old++; 900 new++; 901 if (do_defines && def_state != OUTSIDE) { 902 fputs(end_defined, ofp); 903 def_state = OUTSIDE; 904 } 905 } 906 } 907 if (new <= pat_end && pch_char(new) == '+') { 908 copy_till(where + old - 1, false); 909 if (do_defines) { 910 if (def_state == OUTSIDE) { 911 fputs(if_defined, ofp); 912 def_state = IN_IFDEF; 913 } else if (def_state == IN_IFNDEF) { 914 fputs(else_defined, ofp); 915 def_state = IN_ELSE; 916 } 917 } 918 while (new <= pat_end && pch_char(new) == '+') { 919 fputs(pfetch(new), ofp); 920 new++; 921 } 922 } 923 if (do_defines && def_state != OUTSIDE) { 924 fputs(end_defined, ofp); 925 } 926 } 927 928 /* 929 * Open the new file. 930 */ 931 static void 932 init_output(const char *name) 933 { 934 ofp = fopen(name, "w"); 935 if (ofp == NULL) 936 pfatal("can't create %s", name); 937 } 938 939 /* 940 * Open a file to put hunks we can't locate. 941 */ 942 static void 943 init_reject(const char *name) 944 { 945 rejfp = fopen(name, "w"); 946 if (rejfp == NULL) 947 pfatal("can't create %s", name); 948 } 949 950 /* 951 * Copy input file to output, up to wherever hunk is to be applied. 952 * If endoffile is true, treat the last line specially since it may 953 * lack a newline. 954 */ 955 static void 956 copy_till(LINENUM lastline, bool endoffile) 957 { 958 if (last_frozen_line > lastline) 959 fatal("misordered hunks! output would be garbled\n"); 960 while (last_frozen_line < lastline) { 961 if (++last_frozen_line == lastline && endoffile) 962 dump_line(last_frozen_line, !last_line_missing_eol); 963 else 964 dump_line(last_frozen_line, true); 965 } 966 } 967 968 /* 969 * Finish copying the input file to the output file. 970 */ 971 static bool 972 spew_output(void) 973 { 974 int rv; 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 rv = ferror(ofp) == 0 && fclose(ofp) == 0; 983 ofp = NULL; 984 return rv; 985 } 986 987 /* 988 * Copy one line from input to output. 989 */ 990 static void 991 dump_line(LINENUM line, bool write_newline) 992 { 993 char *s; 994 995 s = ifetch(line, 0); 996 if (s == NULL) 997 return; 998 /* Note: string is not NUL terminated. */ 999 for (; *s != '\n'; s++) 1000 putc(*s, ofp); 1001 if (write_newline) 1002 putc('\n', ofp); 1003 } 1004 1005 /* 1006 * Does the patch pattern match at line base+offset? 1007 */ 1008 static bool 1009 patch_match(LINENUM base, LINENUM offset, LINENUM fuzz) 1010 { 1011 LINENUM pline = 1 + fuzz; 1012 LINENUM iline; 1013 LINENUM pat_lines = pch_ptrn_lines() - fuzz; 1014 const char *ilineptr; 1015 const char *plineptr; 1016 short plinelen; 1017 1018 for (iline = base + offset + fuzz; pline <= pat_lines; pline++, iline++) { 1019 ilineptr = ifetch(iline, offset >= 0); 1020 if (ilineptr == NULL) 1021 return false; 1022 plineptr = pfetch(pline); 1023 plinelen = pch_line_len(pline); 1024 if (canonicalize) { 1025 if (!similar(ilineptr, plineptr, plinelen)) 1026 return false; 1027 } else if (strnNE(ilineptr, plineptr, plinelen)) 1028 return false; 1029 if (iline == input_lines) { 1030 /* 1031 * We are looking at the last line of the file. 1032 * If the file has no eol, the patch line should 1033 * not have one either and vice-versa. Note that 1034 * plinelen > 0. 1035 */ 1036 if (last_line_missing_eol) { 1037 if (plineptr[plinelen - 1] == '\n') 1038 return false; 1039 } else { 1040 if (plineptr[plinelen - 1] != '\n') 1041 return false; 1042 } 1043 } 1044 } 1045 return true; 1046 } 1047 1048 /* 1049 * Do two lines match with canonicalized white space? 1050 */ 1051 static bool 1052 similar(const char *a, const char *b, int len) 1053 { 1054 while (len) { 1055 if (isspace((unsigned char)*b)) { /* whitespace (or \n) to match? */ 1056 if (!isspace((unsigned char)*a)) /* no corresponding whitespace? */ 1057 return false; 1058 while (len && isspace((unsigned char)*b) && *b != '\n') 1059 b++, len--; /* skip pattern whitespace */ 1060 while (isspace((unsigned char)*a) && *a != '\n') 1061 a++; /* skip target whitespace */ 1062 if (*a == '\n' || *b == '\n') 1063 return (*a == *b); /* should end in sync */ 1064 } else if (*a++ != *b++) /* match non-whitespace chars */ 1065 return false; 1066 else 1067 len--; /* probably not necessary */ 1068 } 1069 return true; /* actually, this is not reached */ 1070 /* since there is always a \n */ 1071 } 1072