1 /* $OpenBSD: patch.c,v 1.50 2012/05/15 19:32:02 millert 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 /* how many input lines have been irretractibly output */ 113 static LINENUM last_frozen_line = 0; 114 115 static int Argc; /* guess */ 116 static char **Argv; 117 static int Argc_last; /* for restarting plan_b */ 118 static char **Argv_last; 119 120 static FILE *ofp = NULL; /* output file pointer */ 121 static FILE *rejfp = NULL; /* reject file pointer */ 122 123 static int filec = 0; /* how many file arguments? */ 124 static LINENUM last_offset = 0; 125 static LINENUM maxfuzz = 2; 126 127 /* patch using ifdef, ifndef, etc. */ 128 static bool do_defines = false; 129 /* #ifdef xyzzy */ 130 static char if_defined[128]; 131 /* #ifndef xyzzy */ 132 static char not_defined[128]; 133 /* #else */ 134 static const char else_defined[] = "#else\n"; 135 /* #endif xyzzy */ 136 static char end_defined[128]; 137 138 139 /* Apply a set of diffs as appropriate. */ 140 141 int 142 main(int argc, char *argv[]) 143 { 144 int error = 0, hunk, failed, i, fd; 145 bool patch_seen; 146 LINENUM where = 0, newwhere, fuzz, mymaxfuzz; 147 const char *tmpdir; 148 char *v; 149 150 setlinebuf(stdout); 151 setlinebuf(stderr); 152 for (i = 0; i < MAXFILEC; i++) 153 filearg[i] = NULL; 154 155 /* Cons up the names of the temporary files. */ 156 if ((tmpdir = getenv("TMPDIR")) == NULL || *tmpdir == '\0') 157 tmpdir = _PATH_TMP; 158 for (i = strlen(tmpdir) - 1; i > 0 && tmpdir[i] == '/'; i--) 159 ; 160 i++; 161 if (asprintf(&TMPOUTNAME, "%.*s/patchoXXXXXXXXXX", i, tmpdir) == -1) 162 fatal("cannot allocate memory"); 163 if ((fd = mkstemp(TMPOUTNAME)) < 0) 164 pfatal("can't create %s", TMPOUTNAME); 165 close(fd); 166 167 if (asprintf(&TMPINNAME, "%.*s/patchiXXXXXXXXXX", i, tmpdir) == -1) 168 fatal("cannot allocate memory"); 169 if ((fd = mkstemp(TMPINNAME)) < 0) 170 pfatal("can't create %s", TMPINNAME); 171 close(fd); 172 173 if (asprintf(&TMPREJNAME, "%.*s/patchrXXXXXXXXXX", i, tmpdir) == -1) 174 fatal("cannot allocate memory"); 175 if ((fd = mkstemp(TMPREJNAME)) < 0) 176 pfatal("can't create %s", TMPREJNAME); 177 close(fd); 178 179 if (asprintf(&TMPPATNAME, "%.*s/patchpXXXXXXXXXX", i, tmpdir) == -1) 180 fatal("cannot allocate memory"); 181 if ((fd = mkstemp(TMPPATNAME)) < 0) 182 pfatal("can't create %s", TMPPATNAME); 183 close(fd); 184 185 v = getenv("SIMPLE_BACKUP_SUFFIX"); 186 if (v) 187 simple_backup_suffix = v; 188 else 189 simple_backup_suffix = ORIGEXT; 190 191 /* parse switches */ 192 Argc = argc; 193 Argv = argv; 194 get_some_switches(); 195 196 if (backup_type == none) { 197 if ((v = getenv("PATCH_VERSION_CONTROL")) == NULL) 198 v = getenv("VERSION_CONTROL"); 199 if (v != NULL || !posix) 200 backup_type = get_version(v); /* OK to pass NULL. */ 201 } 202 203 /* make sure we clean up /tmp in case of disaster */ 204 set_signals(0); 205 206 patch_seen = false; 207 for (open_patch_file(filearg[1]); there_is_another_patch(); 208 reinitialize_almost_everything()) { 209 /* for each patch in patch file */ 210 211 patch_seen = true; 212 213 warn_on_invalid_line = true; 214 215 if (outname == NULL) 216 outname = savestr(filearg[0]); 217 218 /* for ed script just up and do it and exit */ 219 if (diff_type == ED_DIFF) { 220 do_ed_script(); 221 continue; 222 } 223 /* initialize the patched file */ 224 if (!skip_rest_of_patch) 225 init_output(TMPOUTNAME); 226 227 /* initialize reject file */ 228 init_reject(TMPREJNAME); 229 230 /* find out where all the lines are */ 231 if (!skip_rest_of_patch) 232 scan_input(filearg[0]); 233 234 /* from here on, open no standard i/o files, because malloc */ 235 /* might misfire and we can't catch it easily */ 236 237 /* apply each hunk of patch */ 238 hunk = 0; 239 failed = 0; 240 out_of_mem = false; 241 while (another_hunk()) { 242 hunk++; 243 fuzz = 0; 244 mymaxfuzz = pch_context(); 245 if (maxfuzz < mymaxfuzz) 246 mymaxfuzz = maxfuzz; 247 if (!skip_rest_of_patch) { 248 do { 249 where = locate_hunk(fuzz); 250 if (hunk == 1 && where == 0 && !force) { 251 /* dwim for reversed patch? */ 252 if (!pch_swap()) { 253 if (fuzz == 0) 254 say("Not enough memory to try swapped hunk! Assuming unswapped.\n"); 255 continue; 256 } 257 reverse = !reverse; 258 /* try again */ 259 where = locate_hunk(fuzz); 260 if (where == 0) { 261 /* didn't find it swapped */ 262 if (!pch_swap()) 263 /* put it back to normal */ 264 fatal("lost hunk on alloc error!\n"); 265 reverse = !reverse; 266 } else if (noreverse) { 267 if (!pch_swap()) 268 /* put it back to normal */ 269 fatal("lost hunk on alloc error!\n"); 270 reverse = !reverse; 271 say("Ignoring previously applied (or reversed) patch.\n"); 272 skip_rest_of_patch = true; 273 } else if (batch) { 274 if (verbose) 275 say("%seversed (or previously applied) patch detected! %s -R.", 276 reverse ? "R" : "Unr", 277 reverse ? "Assuming" : "Ignoring"); 278 } else { 279 ask("%seversed (or previously applied) patch detected! %s -R? [y] ", 280 reverse ? "R" : "Unr", 281 reverse ? "Assume" : "Ignore"); 282 if (*buf == 'n') { 283 ask("Apply anyway? [n] "); 284 if (*buf != 'y') 285 skip_rest_of_patch = true; 286 where = 0; 287 reverse = !reverse; 288 if (!pch_swap()) 289 /* put it back to normal */ 290 fatal("lost hunk on alloc error!\n"); 291 } 292 } 293 } 294 } while (!skip_rest_of_patch && where == 0 && 295 ++fuzz <= mymaxfuzz); 296 297 if (skip_rest_of_patch) { /* just got decided */ 298 fclose(ofp); 299 ofp = NULL; 300 } 301 } 302 newwhere = pch_newfirst() + last_offset; 303 if (skip_rest_of_patch) { 304 abort_hunk(); 305 failed++; 306 if (verbose) 307 say("Hunk #%d ignored at %ld.\n", 308 hunk, newwhere); 309 } else if (where == 0) { 310 abort_hunk(); 311 failed++; 312 if (verbose) 313 say("Hunk #%d failed at %ld.\n", 314 hunk, newwhere); 315 } else { 316 apply_hunk(where); 317 if (verbose) { 318 say("Hunk #%d succeeded at %ld", 319 hunk, newwhere); 320 if (fuzz != 0) 321 say(" with fuzz %ld", fuzz); 322 if (last_offset) 323 say(" (offset %ld line%s)", 324 last_offset, 325 last_offset == 1L ? "" : "s"); 326 say(".\n"); 327 } 328 } 329 } 330 331 if (out_of_mem && using_plan_a) { 332 Argc = Argc_last; 333 Argv = Argv_last; 334 say("\n\nRan out of memory using Plan A--trying again...\n\n"); 335 if (ofp) 336 fclose(ofp); 337 ofp = NULL; 338 if (rejfp) 339 fclose(rejfp); 340 rejfp = NULL; 341 continue; 342 } 343 if (hunk == 0) 344 fatal("Internal error: hunk should not be 0\n"); 345 346 /* finish spewing out the new file */ 347 if (!skip_rest_of_patch) 348 spew_output(); 349 350 /* and put the output where desired */ 351 ignore_signals(); 352 if (!skip_rest_of_patch) { 353 struct stat statbuf; 354 char *realout = outname; 355 356 if (!check_only) { 357 if (move_file(TMPOUTNAME, outname) < 0) { 358 toutkeep = true; 359 realout = TMPOUTNAME; 360 chmod(TMPOUTNAME, filemode); 361 } else 362 chmod(outname, filemode); 363 364 if (remove_empty_files && 365 stat(realout, &statbuf) == 0 && 366 statbuf.st_size == 0) { 367 if (verbose) 368 say("Removing %s (empty after patching).\n", 369 realout); 370 unlink(realout); 371 } 372 } 373 } 374 fclose(rejfp); 375 rejfp = NULL; 376 if (failed) { 377 error = 1; 378 if (*rejname == '\0') { 379 if (strlcpy(rejname, outname, 380 sizeof(rejname)) >= sizeof(rejname)) 381 fatal("filename %s is too long\n", outname); 382 if (strlcat(rejname, REJEXT, 383 sizeof(rejname)) >= sizeof(rejname)) 384 fatal("filename %s is too long\n", outname); 385 } 386 if (!check_only) 387 say("%d out of %d hunks %s--saving rejects to %s\n", 388 failed, hunk, skip_rest_of_patch ? "ignored" : "failed", rejname); 389 else 390 say("%d out of %d hunks %s\n", 391 failed, hunk, skip_rest_of_patch ? "ignored" : "failed"); 392 if (!check_only && move_file(TMPREJNAME, rejname) < 0) 393 trejkeep = true; 394 } 395 set_signals(1); 396 } 397 398 if (!patch_seen) 399 error = 2; 400 401 my_exit(error); 402 /* NOTREACHED */ 403 } 404 405 /* Prepare to find the next patch to do in the patch file. */ 406 407 static void 408 reinitialize_almost_everything(void) 409 { 410 re_patch(); 411 re_input(); 412 413 input_lines = 0; 414 last_frozen_line = 0; 415 416 filec = 0; 417 if (!out_of_mem) { 418 free(filearg[0]); 419 filearg[0] = NULL; 420 } 421 422 free(outname); 423 outname = NULL; 424 425 last_offset = 0; 426 diff_type = 0; 427 428 free(revision); 429 revision = NULL; 430 431 reverse = reverse_flag_specified; 432 skip_rest_of_patch = false; 433 434 get_some_switches(); 435 } 436 437 /* Process switches and filenames. */ 438 439 static void 440 get_some_switches(void) 441 { 442 const char *options = "b::B:cCd:D:eEfF:i:lnNo:p:r:RstuvV:x:z:"; 443 static struct option longopts[] = { 444 {"backup", no_argument, 0, 'b'}, 445 {"batch", no_argument, 0, 't'}, 446 {"check", no_argument, 0, 'C'}, 447 {"context", no_argument, 0, 'c'}, 448 {"debug", required_argument, 0, 'x'}, 449 {"directory", required_argument, 0, 'd'}, 450 {"ed", no_argument, 0, 'e'}, 451 {"force", no_argument, 0, 'f'}, 452 {"forward", no_argument, 0, 'N'}, 453 {"fuzz", required_argument, 0, 'F'}, 454 {"ifdef", required_argument, 0, 'D'}, 455 {"input", required_argument, 0, 'i'}, 456 {"ignore-whitespace", no_argument, 0, 'l'}, 457 {"normal", no_argument, 0, 'n'}, 458 {"output", required_argument, 0, 'o'}, 459 {"prefix", required_argument, 0, 'B'}, 460 {"quiet", no_argument, 0, 's'}, 461 {"reject-file", required_argument, 0, 'r'}, 462 {"remove-empty-files", no_argument, 0, 'E'}, 463 {"reverse", no_argument, 0, 'R'}, 464 {"silent", no_argument, 0, 's'}, 465 {"strip", required_argument, 0, 'p'}, 466 {"suffix", required_argument, 0, 'z'}, 467 {"unified", no_argument, 0, 'u'}, 468 {"version", no_argument, 0, 'v'}, 469 {"version-control", required_argument, 0, 'V'}, 470 {"posix", no_argument, &posix, 1}, 471 {NULL, 0, 0, 0} 472 }; 473 int ch; 474 475 rejname[0] = '\0'; 476 Argc_last = Argc; 477 Argv_last = Argv; 478 if (!Argc) 479 return; 480 optreset = optind = 1; 481 while ((ch = getopt_long(Argc, Argv, options, longopts, NULL)) != -1) { 482 switch (ch) { 483 case 'b': 484 if (backup_type == none) 485 backup_type = numbered_existing; 486 if (optarg == NULL) 487 break; 488 if (verbose) 489 say("Warning, the ``-b suffix'' option has been" 490 " obsoleted by the -z option.\n"); 491 /* FALLTHROUGH */ 492 case 'z': 493 /* must directly follow 'b' case for backwards compat */ 494 simple_backup_suffix = savestr(optarg); 495 break; 496 case 'B': 497 origprae = savestr(optarg); 498 break; 499 case 'c': 500 diff_type = CONTEXT_DIFF; 501 break; 502 case 'C': 503 check_only = true; 504 break; 505 case 'd': 506 if (chdir(optarg) < 0) 507 pfatal("can't cd to %s", optarg); 508 break; 509 case 'D': 510 do_defines = true; 511 if (!isalpha(*optarg) && *optarg != '_') 512 fatal("argument to -D is not an identifier\n"); 513 snprintf(if_defined, sizeof if_defined, 514 "#ifdef %s\n", optarg); 515 snprintf(not_defined, sizeof not_defined, 516 "#ifndef %s\n", optarg); 517 snprintf(end_defined, sizeof end_defined, 518 "#endif /* %s */\n", optarg); 519 break; 520 case 'e': 521 diff_type = ED_DIFF; 522 break; 523 case 'E': 524 remove_empty_files = true; 525 break; 526 case 'f': 527 force = true; 528 break; 529 case 'F': 530 maxfuzz = atoi(optarg); 531 break; 532 case 'i': 533 if (++filec == MAXFILEC) 534 fatal("too many file arguments\n"); 535 filearg[filec] = savestr(optarg); 536 break; 537 case 'l': 538 canonicalize = true; 539 break; 540 case 'n': 541 diff_type = NORMAL_DIFF; 542 break; 543 case 'N': 544 noreverse = true; 545 break; 546 case 'o': 547 outname = savestr(optarg); 548 break; 549 case 'p': 550 strippath = atoi(optarg); 551 break; 552 case 'r': 553 if (strlcpy(rejname, optarg, 554 sizeof(rejname)) >= sizeof(rejname)) 555 fatal("argument for -r is too long\n"); 556 break; 557 case 'R': 558 reverse = true; 559 reverse_flag_specified = true; 560 break; 561 case 's': 562 verbose = false; 563 break; 564 case 't': 565 batch = true; 566 break; 567 case 'u': 568 diff_type = UNI_DIFF; 569 break; 570 case 'v': 571 version(); 572 break; 573 case 'V': 574 backup_type = get_version(optarg); 575 break; 576 #ifdef DEBUGGING 577 case 'x': 578 debug = atoi(optarg); 579 break; 580 #endif 581 default: 582 if (ch != '\0') 583 usage(); 584 break; 585 } 586 } 587 Argc -= optind; 588 Argv += optind; 589 590 if (Argc > 0) { 591 filearg[0] = savestr(*Argv++); 592 Argc--; 593 while (Argc > 0) { 594 if (++filec == MAXFILEC) 595 fatal("too many file arguments\n"); 596 filearg[filec] = savestr(*Argv++); 597 Argc--; 598 } 599 } 600 601 if (getenv("POSIXLY_CORRECT") != NULL) 602 posix = 1; 603 } 604 605 static __dead void 606 usage(void) 607 { 608 fprintf(stderr, 609 "usage: patch [-bCcEeflNnRstuv] [-B backup-prefix] [-D symbol] [-d directory]\n" 610 " [-F max-fuzz] [-i patchfile] [-o out-file] [-p strip-count]\n" 611 " [-r rej-name] [-V t | nil | never] [-x number] [-z backup-ext]\n" 612 " [--posix] [origfile [patchfile]]\n" 613 " patch <patchfile\n"); 614 my_exit(EXIT_SUCCESS); 615 } 616 617 /* 618 * Attempt to find the right place to apply this hunk of patch. 619 */ 620 static LINENUM 621 locate_hunk(LINENUM fuzz) 622 { 623 LINENUM first_guess = pch_first() + last_offset; 624 LINENUM offset; 625 LINENUM pat_lines = pch_ptrn_lines(); 626 LINENUM max_pos_offset = input_lines - first_guess - pat_lines + 1; 627 LINENUM max_neg_offset = first_guess - last_frozen_line - 1 + pch_context(); 628 629 if (pat_lines == 0) { /* null range matches always */ 630 if (verbose && fuzz == 0 && (diff_type == CONTEXT_DIFF 631 || diff_type == NEW_CONTEXT_DIFF 632 || diff_type == UNI_DIFF)) { 633 say("Empty context always matches.\n"); 634 } 635 return (first_guess); 636 } 637 if (max_neg_offset >= first_guess) /* do not try lines < 0 */ 638 max_neg_offset = first_guess - 1; 639 if (first_guess <= input_lines && patch_match(first_guess, 0, fuzz)) 640 return first_guess; 641 for (offset = 1; ; offset++) { 642 bool check_after = (offset <= max_pos_offset); 643 bool check_before = (offset <= max_neg_offset); 644 645 if (check_after && patch_match(first_guess, offset, fuzz)) { 646 #ifdef DEBUGGING 647 if (debug & 1) 648 say("Offset changing from %ld to %ld\n", 649 last_offset, offset); 650 #endif 651 last_offset = offset; 652 return first_guess + offset; 653 } else if (check_before && 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 && !check_after) 662 return 0; 663 } 664 } 665 666 /* We did not find the pattern, dump out the hunk so they can handle it. */ 667 668 static void 669 abort_context_hunk(void) 670 { 671 LINENUM i; 672 const LINENUM pat_end = pch_end(); 673 /* 674 * add in last_offset to guess the same as the previous successful 675 * hunk 676 */ 677 const LINENUM oldfirst = pch_first() + last_offset; 678 const LINENUM newfirst = pch_newfirst() + last_offset; 679 const LINENUM oldlast = oldfirst + pch_ptrn_lines() - 1; 680 const LINENUM newlast = newfirst + pch_repl_lines() - 1; 681 const char *stars = (diff_type >= NEW_CONTEXT_DIFF ? " ****" : ""); 682 const char *minuses = (diff_type >= NEW_CONTEXT_DIFF ? " ----" : " -----"); 683 684 fprintf(rejfp, "***************\n"); 685 for (i = 0; i <= pat_end; i++) { 686 switch (pch_char(i)) { 687 case '*': 688 if (oldlast < oldfirst) 689 fprintf(rejfp, "*** 0%s\n", stars); 690 else if (oldlast == oldfirst) 691 fprintf(rejfp, "*** %ld%s\n", oldfirst, stars); 692 else 693 fprintf(rejfp, "*** %ld,%ld%s\n", oldfirst, 694 oldlast, stars); 695 break; 696 case '=': 697 if (newlast < newfirst) 698 fprintf(rejfp, "--- 0%s\n", minuses); 699 else if (newlast == newfirst) 700 fprintf(rejfp, "--- %ld%s\n", newfirst, minuses); 701 else 702 fprintf(rejfp, "--- %ld,%ld%s\n", newfirst, 703 newlast, minuses); 704 break; 705 case '\n': 706 fprintf(rejfp, "%s", pfetch(i)); 707 break; 708 case ' ': 709 case '-': 710 case '+': 711 case '!': 712 fprintf(rejfp, "%c %s", pch_char(i), pfetch(i)); 713 break; 714 default: 715 fatal("fatal internal error in abort_context_hunk\n"); 716 } 717 } 718 } 719 720 static void 721 rej_line(int ch, LINENUM i) 722 { 723 size_t len; 724 const char *line = pfetch(i); 725 726 len = strlen(line); 727 728 fprintf(rejfp, "%c%s", ch, line); 729 if (len == 0 || line[len-1] != '\n') 730 fprintf(rejfp, "\n\\ No newline at end of file\n"); 731 } 732 733 static void 734 abort_hunk(void) 735 { 736 LINENUM i, j, split; 737 int ch1, ch2; 738 const LINENUM pat_end = pch_end(); 739 const LINENUM oldfirst = pch_first() + last_offset; 740 const LINENUM newfirst = pch_newfirst() + last_offset; 741 742 if (diff_type != UNI_DIFF) { 743 abort_context_hunk(); 744 return; 745 } 746 split = -1; 747 for (i = 0; i <= pat_end; i++) { 748 if (pch_char(i) == '=') { 749 split = i; 750 break; 751 } 752 } 753 if (split == -1) { 754 fprintf(rejfp, "malformed hunk: no split found\n"); 755 return; 756 } 757 i = 0; 758 j = split + 1; 759 fprintf(rejfp, "@@ -%ld,%ld +%ld,%ld @@\n", 760 pch_ptrn_lines() ? oldfirst : 0, 761 pch_ptrn_lines(), newfirst, pch_repl_lines()); 762 while (i < split || j <= pat_end) { 763 ch1 = i < split ? pch_char(i) : -1; 764 ch2 = j <= pat_end ? pch_char(j) : -1; 765 if (ch1 == '-') { 766 rej_line('-', i); 767 i++; 768 } else if (ch1 == ' ' && ch2 == ' ') { 769 rej_line(' ', i); 770 i++; 771 j++; 772 } else if (ch1 == '!' && ch2 == '!') { 773 while (i < split && ch1 == '!') { 774 rej_line('-', i); 775 i++; 776 ch1 = i < split ? pch_char(i) : -1; 777 } 778 while (j <= pat_end && ch2 == '!') { 779 rej_line('+', j); 780 j++; 781 ch2 = j <= pat_end ? pch_char(j) : -1; 782 } 783 } else if (ch1 == '*') { 784 i++; 785 } else if (ch2 == '+' || ch2 == ' ') { 786 rej_line(ch2, j); 787 j++; 788 } else { 789 fprintf(rejfp, "internal error on (%ld %ld %ld)\n", 790 i, split, j); 791 rej_line(ch1, i); 792 rej_line(ch2, j); 793 return; 794 } 795 } 796 } 797 798 /* We found where to apply it (we hope), so do it. */ 799 800 static void 801 apply_hunk(LINENUM where) 802 { 803 LINENUM old = 1; 804 const LINENUM lastline = pch_ptrn_lines(); 805 LINENUM new = lastline + 1; 806 #define OUTSIDE 0 807 #define IN_IFNDEF 1 808 #define IN_IFDEF 2 809 #define IN_ELSE 3 810 int def_state = OUTSIDE; 811 const LINENUM pat_end = pch_end(); 812 813 where--; 814 while (pch_char(new) == '=' || pch_char(new) == '\n') 815 new++; 816 817 while (old <= lastline) { 818 if (pch_char(old) == '-') { 819 copy_till(where + old - 1, false); 820 if (do_defines) { 821 if (def_state == OUTSIDE) { 822 fputs(not_defined, ofp); 823 def_state = IN_IFNDEF; 824 } else if (def_state == IN_IFDEF) { 825 fputs(else_defined, ofp); 826 def_state = IN_ELSE; 827 } 828 fputs(pfetch(old), ofp); 829 } 830 last_frozen_line++; 831 old++; 832 } else if (new > pat_end) { 833 break; 834 } else if (pch_char(new) == '+') { 835 copy_till(where + old - 1, false); 836 if (do_defines) { 837 if (def_state == IN_IFNDEF) { 838 fputs(else_defined, ofp); 839 def_state = IN_ELSE; 840 } else if (def_state == OUTSIDE) { 841 fputs(if_defined, ofp); 842 def_state = IN_IFDEF; 843 } 844 } 845 fputs(pfetch(new), ofp); 846 new++; 847 } else if (pch_char(new) != pch_char(old)) { 848 say("Out-of-sync patch, lines %ld,%ld--mangled text or line numbers, maybe?\n", 849 pch_hunk_beg() + old, 850 pch_hunk_beg() + new); 851 #ifdef DEBUGGING 852 say("oldchar = '%c', newchar = '%c'\n", 853 pch_char(old), pch_char(new)); 854 #endif 855 my_exit(2); 856 } else if (pch_char(new) == '!') { 857 copy_till(where + old - 1, false); 858 if (do_defines) { 859 fputs(not_defined, ofp); 860 def_state = IN_IFNDEF; 861 } 862 while (pch_char(old) == '!') { 863 if (do_defines) { 864 fputs(pfetch(old), ofp); 865 } 866 last_frozen_line++; 867 old++; 868 } 869 if (do_defines) { 870 fputs(else_defined, ofp); 871 def_state = IN_ELSE; 872 } 873 while (pch_char(new) == '!') { 874 fputs(pfetch(new), ofp); 875 new++; 876 } 877 } else { 878 if (pch_char(new) != ' ') 879 fatal("Internal error: expected ' '\n"); 880 old++; 881 new++; 882 if (do_defines && def_state != OUTSIDE) { 883 fputs(end_defined, ofp); 884 def_state = OUTSIDE; 885 } 886 } 887 } 888 if (new <= pat_end && pch_char(new) == '+') { 889 copy_till(where + old - 1, false); 890 if (do_defines) { 891 if (def_state == OUTSIDE) { 892 fputs(if_defined, ofp); 893 def_state = IN_IFDEF; 894 } else if (def_state == IN_IFNDEF) { 895 fputs(else_defined, ofp); 896 def_state = IN_ELSE; 897 } 898 } 899 while (new <= pat_end && pch_char(new) == '+') { 900 fputs(pfetch(new), ofp); 901 new++; 902 } 903 } 904 if (do_defines && def_state != OUTSIDE) { 905 fputs(end_defined, ofp); 906 } 907 } 908 909 /* 910 * Open the new file. 911 */ 912 static void 913 init_output(const char *name) 914 { 915 ofp = fopen(name, "w"); 916 if (ofp == NULL) 917 pfatal("can't create %s", name); 918 } 919 920 /* 921 * Open a file to put hunks we can't locate. 922 */ 923 static void 924 init_reject(const char *name) 925 { 926 rejfp = fopen(name, "w"); 927 if (rejfp == NULL) 928 pfatal("can't create %s", name); 929 } 930 931 /* 932 * Copy input file to output, up to wherever hunk is to be applied. 933 * If endoffile is true, treat the last line specially since it may 934 * lack a newline. 935 */ 936 static void 937 copy_till(LINENUM lastline, bool endoffile) 938 { 939 if (last_frozen_line > lastline) 940 fatal("misordered hunks! output would be garbled\n"); 941 while (last_frozen_line < lastline) { 942 if (++last_frozen_line == lastline && endoffile) 943 dump_line(last_frozen_line, !last_line_missing_eol); 944 else 945 dump_line(last_frozen_line, true); 946 } 947 } 948 949 /* 950 * Finish copying the input file to the output file. 951 */ 952 static void 953 spew_output(void) 954 { 955 #ifdef DEBUGGING 956 if (debug & 256) 957 say("il=%ld lfl=%ld\n", input_lines, last_frozen_line); 958 #endif 959 if (input_lines) 960 copy_till(input_lines, true); /* dump remainder of file */ 961 fclose(ofp); 962 ofp = NULL; 963 } 964 965 /* 966 * Copy one line from input to output. 967 */ 968 static void 969 dump_line(LINENUM line, bool write_newline) 970 { 971 char *s; 972 973 s = ifetch(line, 0); 974 if (s == NULL) 975 return; 976 /* Note: string is not NUL terminated. */ 977 for (; *s != '\n'; s++) 978 putc(*s, ofp); 979 if (write_newline) 980 putc('\n', ofp); 981 } 982 983 /* 984 * Does the patch pattern match at line base+offset? 985 */ 986 static bool 987 patch_match(LINENUM base, LINENUM offset, LINENUM fuzz) 988 { 989 LINENUM pline = 1 + fuzz; 990 LINENUM iline; 991 LINENUM pat_lines = pch_ptrn_lines() - fuzz; 992 const char *ilineptr; 993 const char *plineptr; 994 short plinelen; 995 996 for (iline = base + offset + fuzz; pline <= pat_lines; pline++, iline++) { 997 ilineptr = ifetch(iline, offset >= 0); 998 if (ilineptr == NULL) 999 return false; 1000 plineptr = pfetch(pline); 1001 plinelen = pch_line_len(pline); 1002 if (canonicalize) { 1003 if (!similar(ilineptr, plineptr, plinelen)) 1004 return false; 1005 } else if (strnNE(ilineptr, plineptr, plinelen)) 1006 return false; 1007 if (iline == input_lines) { 1008 /* 1009 * We are looking at the last line of the file. 1010 * If the file has no eol, the patch line should 1011 * not have one either and vice-versa. Note that 1012 * plinelen > 0. 1013 */ 1014 if (last_line_missing_eol) { 1015 if (plineptr[plinelen - 1] == '\n') 1016 return false; 1017 } else { 1018 if (plineptr[plinelen - 1] != '\n') 1019 return false; 1020 } 1021 } 1022 } 1023 return true; 1024 } 1025 1026 /* 1027 * Do two lines match with canonicalized white space? 1028 */ 1029 static bool 1030 similar(const char *a, const char *b, int len) 1031 { 1032 while (len) { 1033 if (isspace(*b)) { /* whitespace (or \n) to match? */ 1034 if (!isspace(*a)) /* no corresponding whitespace? */ 1035 return false; 1036 while (len && isspace(*b) && *b != '\n') 1037 b++, len--; /* skip pattern whitespace */ 1038 while (isspace(*a) && *a != '\n') 1039 a++; /* skip target whitespace */ 1040 if (*a == '\n' || *b == '\n') 1041 return (*a == *b); /* should end in sync */ 1042 } else if (*a++ != *b++) /* match non-whitespace chars */ 1043 return false; 1044 else 1045 len--; /* probably not necessary */ 1046 } 1047 return true; /* actually, this is not reached */ 1048 /* since there is always a \n */ 1049 } 1050