1 /* $OpenBSD: patch.c,v 1.49 2010/07/24 01:10:12 ray 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 (skip_rest_of_patch) { 387 say("%d out of %d hunks ignored--saving rejects to %s\n", 388 failed, hunk, rejname); 389 } else { 390 say("%d out of %d hunks failed--saving rejects to %s\n", 391 failed, hunk, rejname); 392 } 393 if (!check_only && move_file(TMPREJNAME, rejname) < 0) 394 trejkeep = true; 395 } 396 set_signals(1); 397 } 398 399 if (!patch_seen) 400 error = 2; 401 402 my_exit(error); 403 /* NOTREACHED */ 404 } 405 406 /* Prepare to find the next patch to do in the patch file. */ 407 408 static void 409 reinitialize_almost_everything(void) 410 { 411 re_patch(); 412 re_input(); 413 414 input_lines = 0; 415 last_frozen_line = 0; 416 417 filec = 0; 418 if (!out_of_mem) { 419 free(filearg[0]); 420 filearg[0] = NULL; 421 } 422 423 free(outname); 424 outname = NULL; 425 426 last_offset = 0; 427 diff_type = 0; 428 429 free(revision); 430 revision = NULL; 431 432 reverse = reverse_flag_specified; 433 skip_rest_of_patch = false; 434 435 get_some_switches(); 436 } 437 438 /* Process switches and filenames. */ 439 440 static void 441 get_some_switches(void) 442 { 443 const char *options = "b::B:cCd:D:eEfF:i:lnNo:p:r:RstuvV:x:z:"; 444 static struct option longopts[] = { 445 {"backup", no_argument, 0, 'b'}, 446 {"batch", no_argument, 0, 't'}, 447 {"check", no_argument, 0, 'C'}, 448 {"context", no_argument, 0, 'c'}, 449 {"debug", required_argument, 0, 'x'}, 450 {"directory", required_argument, 0, 'd'}, 451 {"ed", no_argument, 0, 'e'}, 452 {"force", no_argument, 0, 'f'}, 453 {"forward", no_argument, 0, 'N'}, 454 {"fuzz", required_argument, 0, 'F'}, 455 {"ifdef", required_argument, 0, 'D'}, 456 {"input", required_argument, 0, 'i'}, 457 {"ignore-whitespace", no_argument, 0, 'l'}, 458 {"normal", no_argument, 0, 'n'}, 459 {"output", required_argument, 0, 'o'}, 460 {"prefix", required_argument, 0, 'B'}, 461 {"quiet", no_argument, 0, 's'}, 462 {"reject-file", required_argument, 0, 'r'}, 463 {"remove-empty-files", no_argument, 0, 'E'}, 464 {"reverse", no_argument, 0, 'R'}, 465 {"silent", no_argument, 0, 's'}, 466 {"strip", required_argument, 0, 'p'}, 467 {"suffix", required_argument, 0, 'z'}, 468 {"unified", no_argument, 0, 'u'}, 469 {"version", no_argument, 0, 'v'}, 470 {"version-control", required_argument, 0, 'V'}, 471 {"posix", no_argument, &posix, 1}, 472 {NULL, 0, 0, 0} 473 }; 474 int ch; 475 476 rejname[0] = '\0'; 477 Argc_last = Argc; 478 Argv_last = Argv; 479 if (!Argc) 480 return; 481 optreset = optind = 1; 482 while ((ch = getopt_long(Argc, Argv, options, longopts, NULL)) != -1) { 483 switch (ch) { 484 case 'b': 485 if (backup_type == none) 486 backup_type = numbered_existing; 487 if (optarg == NULL) 488 break; 489 if (verbose) 490 say("Warning, the ``-b suffix'' option has been" 491 " obsoleted by the -z option.\n"); 492 /* FALLTHROUGH */ 493 case 'z': 494 /* must directly follow 'b' case for backwards compat */ 495 simple_backup_suffix = savestr(optarg); 496 break; 497 case 'B': 498 origprae = savestr(optarg); 499 break; 500 case 'c': 501 diff_type = CONTEXT_DIFF; 502 break; 503 case 'C': 504 check_only = true; 505 break; 506 case 'd': 507 if (chdir(optarg) < 0) 508 pfatal("can't cd to %s", optarg); 509 break; 510 case 'D': 511 do_defines = true; 512 if (!isalpha(*optarg) && *optarg != '_') 513 fatal("argument to -D is not an identifier\n"); 514 snprintf(if_defined, sizeof if_defined, 515 "#ifdef %s\n", optarg); 516 snprintf(not_defined, sizeof not_defined, 517 "#ifndef %s\n", optarg); 518 snprintf(end_defined, sizeof end_defined, 519 "#endif /* %s */\n", optarg); 520 break; 521 case 'e': 522 diff_type = ED_DIFF; 523 break; 524 case 'E': 525 remove_empty_files = true; 526 break; 527 case 'f': 528 force = true; 529 break; 530 case 'F': 531 maxfuzz = atoi(optarg); 532 break; 533 case 'i': 534 if (++filec == MAXFILEC) 535 fatal("too many file arguments\n"); 536 filearg[filec] = savestr(optarg); 537 break; 538 case 'l': 539 canonicalize = true; 540 break; 541 case 'n': 542 diff_type = NORMAL_DIFF; 543 break; 544 case 'N': 545 noreverse = true; 546 break; 547 case 'o': 548 outname = savestr(optarg); 549 break; 550 case 'p': 551 strippath = atoi(optarg); 552 break; 553 case 'r': 554 if (strlcpy(rejname, optarg, 555 sizeof(rejname)) >= sizeof(rejname)) 556 fatal("argument for -r is too long\n"); 557 break; 558 case 'R': 559 reverse = true; 560 reverse_flag_specified = true; 561 break; 562 case 's': 563 verbose = false; 564 break; 565 case 't': 566 batch = true; 567 break; 568 case 'u': 569 diff_type = UNI_DIFF; 570 break; 571 case 'v': 572 version(); 573 break; 574 case 'V': 575 backup_type = get_version(optarg); 576 break; 577 #ifdef DEBUGGING 578 case 'x': 579 debug = atoi(optarg); 580 break; 581 #endif 582 default: 583 if (ch != '\0') 584 usage(); 585 break; 586 } 587 } 588 Argc -= optind; 589 Argv += optind; 590 591 if (Argc > 0) { 592 filearg[0] = savestr(*Argv++); 593 Argc--; 594 while (Argc > 0) { 595 if (++filec == MAXFILEC) 596 fatal("too many file arguments\n"); 597 filearg[filec] = savestr(*Argv++); 598 Argc--; 599 } 600 } 601 602 if (getenv("POSIXLY_CORRECT") != NULL) 603 posix = 1; 604 } 605 606 static __dead void 607 usage(void) 608 { 609 fprintf(stderr, 610 "usage: patch [-bCcEeflNnRstuv] [-B backup-prefix] [-D symbol] [-d directory]\n" 611 " [-F max-fuzz] [-i patchfile] [-o out-file] [-p strip-count]\n" 612 " [-r rej-name] [-V t | nil | never] [-x number] [-z backup-ext]\n" 613 " [--posix] [origfile [patchfile]]\n" 614 " patch <patchfile\n"); 615 my_exit(EXIT_SUCCESS); 616 } 617 618 /* 619 * Attempt to find the right place to apply this hunk of patch. 620 */ 621 static LINENUM 622 locate_hunk(LINENUM fuzz) 623 { 624 LINENUM first_guess = pch_first() + last_offset; 625 LINENUM offset; 626 LINENUM pat_lines = pch_ptrn_lines(); 627 LINENUM max_pos_offset = input_lines - first_guess - pat_lines + 1; 628 LINENUM max_neg_offset = first_guess - last_frozen_line - 1 + pch_context(); 629 630 if (pat_lines == 0) { /* null range matches always */ 631 if (verbose && fuzz == 0 && (diff_type == CONTEXT_DIFF 632 || diff_type == NEW_CONTEXT_DIFF 633 || diff_type == UNI_DIFF)) { 634 say("Empty context always matches.\n"); 635 } 636 return (first_guess); 637 } 638 if (max_neg_offset >= first_guess) /* do not try lines < 0 */ 639 max_neg_offset = first_guess - 1; 640 if (first_guess <= input_lines && patch_match(first_guess, 0, fuzz)) 641 return first_guess; 642 for (offset = 1; ; offset++) { 643 bool check_after = (offset <= max_pos_offset); 644 bool check_before = (offset <= max_neg_offset); 645 646 if (check_after && patch_match(first_guess, offset, fuzz)) { 647 #ifdef DEBUGGING 648 if (debug & 1) 649 say("Offset changing from %ld to %ld\n", 650 last_offset, offset); 651 #endif 652 last_offset = offset; 653 return first_guess + offset; 654 } else if (check_before && patch_match(first_guess, -offset, fuzz)) { 655 #ifdef DEBUGGING 656 if (debug & 1) 657 say("Offset changing from %ld to %ld\n", 658 last_offset, -offset); 659 #endif 660 last_offset = -offset; 661 return first_guess - offset; 662 } else if (!check_before && !check_after) 663 return 0; 664 } 665 } 666 667 /* We did not find the pattern, dump out the hunk so they can handle it. */ 668 669 static void 670 abort_context_hunk(void) 671 { 672 LINENUM i; 673 const LINENUM pat_end = pch_end(); 674 /* 675 * add in last_offset to guess the same as the previous successful 676 * hunk 677 */ 678 const LINENUM oldfirst = pch_first() + last_offset; 679 const LINENUM newfirst = pch_newfirst() + last_offset; 680 const LINENUM oldlast = oldfirst + pch_ptrn_lines() - 1; 681 const LINENUM newlast = newfirst + pch_repl_lines() - 1; 682 const char *stars = (diff_type >= NEW_CONTEXT_DIFF ? " ****" : ""); 683 const char *minuses = (diff_type >= NEW_CONTEXT_DIFF ? " ----" : " -----"); 684 685 fprintf(rejfp, "***************\n"); 686 for (i = 0; i <= pat_end; i++) { 687 switch (pch_char(i)) { 688 case '*': 689 if (oldlast < oldfirst) 690 fprintf(rejfp, "*** 0%s\n", stars); 691 else if (oldlast == oldfirst) 692 fprintf(rejfp, "*** %ld%s\n", oldfirst, stars); 693 else 694 fprintf(rejfp, "*** %ld,%ld%s\n", oldfirst, 695 oldlast, stars); 696 break; 697 case '=': 698 if (newlast < newfirst) 699 fprintf(rejfp, "--- 0%s\n", minuses); 700 else if (newlast == newfirst) 701 fprintf(rejfp, "--- %ld%s\n", newfirst, minuses); 702 else 703 fprintf(rejfp, "--- %ld,%ld%s\n", newfirst, 704 newlast, minuses); 705 break; 706 case '\n': 707 fprintf(rejfp, "%s", pfetch(i)); 708 break; 709 case ' ': 710 case '-': 711 case '+': 712 case '!': 713 fprintf(rejfp, "%c %s", pch_char(i), pfetch(i)); 714 break; 715 default: 716 fatal("fatal internal error in abort_context_hunk\n"); 717 } 718 } 719 } 720 721 static void 722 rej_line(int ch, LINENUM i) 723 { 724 size_t len; 725 const char *line = pfetch(i); 726 727 len = strlen(line); 728 729 fprintf(rejfp, "%c%s", ch, line); 730 if (len == 0 || line[len-1] != '\n') 731 fprintf(rejfp, "\n\\ No newline at end of file\n"); 732 } 733 734 static void 735 abort_hunk(void) 736 { 737 LINENUM i, j, split; 738 int ch1, ch2; 739 const LINENUM pat_end = pch_end(); 740 const LINENUM oldfirst = pch_first() + last_offset; 741 const LINENUM newfirst = pch_newfirst() + last_offset; 742 743 if (diff_type != UNI_DIFF) { 744 abort_context_hunk(); 745 return; 746 } 747 split = -1; 748 for (i = 0; i <= pat_end; i++) { 749 if (pch_char(i) == '=') { 750 split = i; 751 break; 752 } 753 } 754 if (split == -1) { 755 fprintf(rejfp, "malformed hunk: no split found\n"); 756 return; 757 } 758 i = 0; 759 j = split + 1; 760 fprintf(rejfp, "@@ -%ld,%ld +%ld,%ld @@\n", 761 pch_ptrn_lines() ? oldfirst : 0, 762 pch_ptrn_lines(), newfirst, pch_repl_lines()); 763 while (i < split || j <= pat_end) { 764 ch1 = i < split ? pch_char(i) : -1; 765 ch2 = j <= pat_end ? pch_char(j) : -1; 766 if (ch1 == '-') { 767 rej_line('-', i); 768 i++; 769 } else if (ch1 == ' ' && ch2 == ' ') { 770 rej_line(' ', i); 771 i++; 772 j++; 773 } else if (ch1 == '!' && ch2 == '!') { 774 while (i < split && ch1 == '!') { 775 rej_line('-', i); 776 i++; 777 ch1 = i < split ? pch_char(i) : -1; 778 } 779 while (j <= pat_end && ch2 == '!') { 780 rej_line('+', j); 781 j++; 782 ch2 = j <= pat_end ? pch_char(j) : -1; 783 } 784 } else if (ch1 == '*') { 785 i++; 786 } else if (ch2 == '+' || ch2 == ' ') { 787 rej_line(ch2, j); 788 j++; 789 } else { 790 fprintf(rejfp, "internal error on (%ld %ld %ld)\n", 791 i, split, j); 792 rej_line(ch1, i); 793 rej_line(ch2, j); 794 return; 795 } 796 } 797 } 798 799 /* We found where to apply it (we hope), so do it. */ 800 801 static void 802 apply_hunk(LINENUM where) 803 { 804 LINENUM old = 1; 805 const LINENUM lastline = pch_ptrn_lines(); 806 LINENUM new = lastline + 1; 807 #define OUTSIDE 0 808 #define IN_IFNDEF 1 809 #define IN_IFDEF 2 810 #define IN_ELSE 3 811 int def_state = OUTSIDE; 812 const LINENUM pat_end = pch_end(); 813 814 where--; 815 while (pch_char(new) == '=' || pch_char(new) == '\n') 816 new++; 817 818 while (old <= lastline) { 819 if (pch_char(old) == '-') { 820 copy_till(where + old - 1, false); 821 if (do_defines) { 822 if (def_state == OUTSIDE) { 823 fputs(not_defined, ofp); 824 def_state = IN_IFNDEF; 825 } else if (def_state == IN_IFDEF) { 826 fputs(else_defined, ofp); 827 def_state = IN_ELSE; 828 } 829 fputs(pfetch(old), ofp); 830 } 831 last_frozen_line++; 832 old++; 833 } else if (new > pat_end) { 834 break; 835 } else if (pch_char(new) == '+') { 836 copy_till(where + old - 1, false); 837 if (do_defines) { 838 if (def_state == IN_IFNDEF) { 839 fputs(else_defined, ofp); 840 def_state = IN_ELSE; 841 } else if (def_state == OUTSIDE) { 842 fputs(if_defined, ofp); 843 def_state = IN_IFDEF; 844 } 845 } 846 fputs(pfetch(new), ofp); 847 new++; 848 } else if (pch_char(new) != pch_char(old)) { 849 say("Out-of-sync patch, lines %ld,%ld--mangled text or line numbers, maybe?\n", 850 pch_hunk_beg() + old, 851 pch_hunk_beg() + new); 852 #ifdef DEBUGGING 853 say("oldchar = '%c', newchar = '%c'\n", 854 pch_char(old), pch_char(new)); 855 #endif 856 my_exit(2); 857 } else if (pch_char(new) == '!') { 858 copy_till(where + old - 1, false); 859 if (do_defines) { 860 fputs(not_defined, ofp); 861 def_state = IN_IFNDEF; 862 } 863 while (pch_char(old) == '!') { 864 if (do_defines) { 865 fputs(pfetch(old), ofp); 866 } 867 last_frozen_line++; 868 old++; 869 } 870 if (do_defines) { 871 fputs(else_defined, ofp); 872 def_state = IN_ELSE; 873 } 874 while (pch_char(new) == '!') { 875 fputs(pfetch(new), ofp); 876 new++; 877 } 878 } else { 879 if (pch_char(new) != ' ') 880 fatal("Internal error: expected ' '\n"); 881 old++; 882 new++; 883 if (do_defines && def_state != OUTSIDE) { 884 fputs(end_defined, ofp); 885 def_state = OUTSIDE; 886 } 887 } 888 } 889 if (new <= pat_end && pch_char(new) == '+') { 890 copy_till(where + old - 1, false); 891 if (do_defines) { 892 if (def_state == OUTSIDE) { 893 fputs(if_defined, ofp); 894 def_state = IN_IFDEF; 895 } else if (def_state == IN_IFNDEF) { 896 fputs(else_defined, ofp); 897 def_state = IN_ELSE; 898 } 899 } 900 while (new <= pat_end && pch_char(new) == '+') { 901 fputs(pfetch(new), ofp); 902 new++; 903 } 904 } 905 if (do_defines && def_state != OUTSIDE) { 906 fputs(end_defined, ofp); 907 } 908 } 909 910 /* 911 * Open the new file. 912 */ 913 static void 914 init_output(const char *name) 915 { 916 ofp = fopen(name, "w"); 917 if (ofp == NULL) 918 pfatal("can't create %s", name); 919 } 920 921 /* 922 * Open a file to put hunks we can't locate. 923 */ 924 static void 925 init_reject(const char *name) 926 { 927 rejfp = fopen(name, "w"); 928 if (rejfp == NULL) 929 pfatal("can't create %s", name); 930 } 931 932 /* 933 * Copy input file to output, up to wherever hunk is to be applied. 934 * If endoffile is true, treat the last line specially since it may 935 * lack a newline. 936 */ 937 static void 938 copy_till(LINENUM lastline, bool endoffile) 939 { 940 if (last_frozen_line > lastline) 941 fatal("misordered hunks! output would be garbled\n"); 942 while (last_frozen_line < lastline) { 943 if (++last_frozen_line == lastline && endoffile) 944 dump_line(last_frozen_line, !last_line_missing_eol); 945 else 946 dump_line(last_frozen_line, true); 947 } 948 } 949 950 /* 951 * Finish copying the input file to the output file. 952 */ 953 static void 954 spew_output(void) 955 { 956 #ifdef DEBUGGING 957 if (debug & 256) 958 say("il=%ld lfl=%ld\n", input_lines, last_frozen_line); 959 #endif 960 if (input_lines) 961 copy_till(input_lines, true); /* dump remainder of file */ 962 fclose(ofp); 963 ofp = NULL; 964 } 965 966 /* 967 * Copy one line from input to output. 968 */ 969 static void 970 dump_line(LINENUM line, bool write_newline) 971 { 972 char *s; 973 974 s = ifetch(line, 0); 975 if (s == NULL) 976 return; 977 /* Note: string is not NUL terminated. */ 978 for (; *s != '\n'; s++) 979 putc(*s, ofp); 980 if (write_newline) 981 putc('\n', ofp); 982 } 983 984 /* 985 * Does the patch pattern match at line base+offset? 986 */ 987 static bool 988 patch_match(LINENUM base, LINENUM offset, LINENUM fuzz) 989 { 990 LINENUM pline = 1 + fuzz; 991 LINENUM iline; 992 LINENUM pat_lines = pch_ptrn_lines() - fuzz; 993 const char *ilineptr; 994 const char *plineptr; 995 short plinelen; 996 997 for (iline = base + offset + fuzz; pline <= pat_lines; pline++, iline++) { 998 ilineptr = ifetch(iline, offset >= 0); 999 if (ilineptr == NULL) 1000 return false; 1001 plineptr = pfetch(pline); 1002 plinelen = pch_line_len(pline); 1003 if (canonicalize) { 1004 if (!similar(ilineptr, plineptr, plinelen)) 1005 return false; 1006 } else if (strnNE(ilineptr, plineptr, plinelen)) 1007 return false; 1008 if (iline == input_lines) { 1009 /* 1010 * We are looking at the last line of the file. 1011 * If the file has no eol, the patch line should 1012 * not have one either and vice-versa. Note that 1013 * plinelen > 0. 1014 */ 1015 if (last_line_missing_eol) { 1016 if (plineptr[plinelen - 1] == '\n') 1017 return false; 1018 } else { 1019 if (plineptr[plinelen - 1] != '\n') 1020 return false; 1021 } 1022 } 1023 } 1024 return true; 1025 } 1026 1027 /* 1028 * Do two lines match with canonicalized white space? 1029 */ 1030 static bool 1031 similar(const char *a, const char *b, int len) 1032 { 1033 while (len) { 1034 if (isspace(*b)) { /* whitespace (or \n) to match? */ 1035 if (!isspace(*a)) /* no corresponding whitespace? */ 1036 return false; 1037 while (len && isspace(*b) && *b != '\n') 1038 b++, len--; /* skip pattern whitespace */ 1039 while (isspace(*a) && *a != '\n') 1040 a++; /* skip target whitespace */ 1041 if (*a == '\n' || *b == '\n') 1042 return (*a == *b); /* should end in sync */ 1043 } else if (*a++ != *b++) /* match non-whitespace chars */ 1044 return false; 1045 else 1046 len--; /* probably not necessary */ 1047 } 1048 return true; /* actually, this is not reached */ 1049 /* since there is always a \n */ 1050 } 1051