1 /* 2 * $OpenBSD: patch.c,v 1.45 2007/04/18 21:52:24 sobrado Exp $ 3 * $DragonFly: src/usr.bin/patch/patch.c,v 1.10 2008/08/10 23:39:56 joerg Exp $ 4 */ 5 6 /* 7 * patch - a program to apply diffs to original files 8 * 9 * Copyright 1986, Larry Wall 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following condition is met: 13 * 1. Redistributions of source code must retain the above copyright notice, 14 * this condition and the following disclaimer. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY 17 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 18 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 19 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR 20 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 22 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 23 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 * 28 * -C option added in 1998, original code by Marc Espie, based on FreeBSD 29 * behaviour 30 */ 31 32 #include <sys/types.h> 33 #include <sys/stat.h> 34 35 #include <ctype.h> 36 #include <getopt.h> 37 #include <limits.h> 38 #include <stdio.h> 39 #include <string.h> 40 #include <stdlib.h> 41 #include <unistd.h> 42 43 #include "common.h" 44 #include "util.h" 45 #include "pch.h" 46 #include "inp.h" 47 #include "backupfile.h" 48 #include "pathnames.h" 49 50 mode_t filemode = 0644; 51 52 char buf[MAXLINELEN]; /* general purpose buffer */ 53 size_t buf_len = sizeof(buf); 54 55 bool using_plan_a = true; /* try to keep everything in memory */ 56 bool out_of_mem = false; /* ran out of memory in plan a */ 57 58 #define MAXFILEC 2 59 60 char *filearg[MAXFILEC]; 61 bool ok_to_create_file = false; 62 char *outname = NULL; 63 char *origprae = NULL; 64 char *TMPOUTNAME; 65 char *TMPINNAME; 66 char *TMPREJNAME; 67 char *TMPPATNAME; 68 bool toutkeep = false; 69 bool trejkeep = false; 70 bool warn_on_invalid_line; 71 bool last_line_missing_eol; 72 73 #ifdef DEBUGGING 74 int debug = 0; 75 #endif 76 77 bool force = false; 78 bool batch = false; 79 bool verbose = true; 80 bool reverse = false; 81 bool noreverse = false; 82 bool skip_rest_of_patch = false; 83 int strippath = 957; 84 bool canonicalize = false; 85 bool check_only = false; 86 int diff_type = 0; 87 char *revision = NULL; /* prerequisite revision, if any */ 88 LINENUM input_lines = 0; /* how long is input file in lines */ 89 int posix = 0; /* strict POSIX mode? */ 90 91 static void reinitialize_almost_everything(void); 92 static void get_some_switches(void); 93 static LINENUM locate_hunk(LINENUM); 94 static void abort_context_hunk(void); 95 static void rej_line(int, LINENUM); 96 static void abort_hunk(void); 97 static void apply_hunk(LINENUM); 98 static void init_output(const char *); 99 static void init_reject(const char *); 100 static void copy_till(LINENUM, bool); 101 static bool spew_output(void); 102 static void dump_line(LINENUM, bool); 103 static bool patch_match(LINENUM, LINENUM, LINENUM); 104 static bool similar(const char *, const char *, int); 105 static void usage(void); 106 107 /* true if -E was specified on command line. */ 108 static bool remove_empty_files = false; 109 110 /* true if -R was specified on command line. */ 111 static bool reverse_flag_specified = false; 112 113 /* buffer holding the name of the rejected patch file. */ 114 static char rejname[NAME_MAX + 1]; 115 116 /* buffer for stderr */ 117 static char serrbuf[BUFSIZ]; 118 119 /* how many input lines have been irretractibly output */ 120 static LINENUM last_frozen_line = 0; 121 122 static int Argc; /* guess */ 123 static char **Argv; 124 static int Argc_last; /* for restarting plan_b */ 125 static char **Argv_last; 126 127 static FILE *ofp = NULL; /* output file pointer */ 128 static FILE *rejfp = NULL; /* reject file pointer */ 129 130 static int filec = 0; /* how many file arguments? */ 131 static LINENUM last_offset = 0; 132 static LINENUM maxfuzz = 2; 133 134 /* patch using ifdef, ifndef, etc. */ 135 static bool do_defines = false; 136 /* #ifdef xyzzy */ 137 static char if_defined[128]; 138 /* #ifndef xyzzy */ 139 static char not_defined[128]; 140 /* #else */ 141 static const char else_defined[] = "#else\n"; 142 /* #endif xyzzy */ 143 static char end_defined[128]; 144 145 146 /* Apply a set of diffs as appropriate. */ 147 148 int 149 main(int argc, char *argv[]) 150 { 151 int error = 0, hunk, failed, i, fd; 152 LINENUM where = 0, newwhere, fuzz, mymaxfuzz; 153 const char *tmpdir; 154 char *v; 155 156 setbuf(stderr, serrbuf); 157 for (i = 0; i < MAXFILEC; i++) 158 filearg[i] = NULL; 159 160 /* Cons up the names of the temporary files. */ 161 if ((tmpdir = getenv("TMPDIR")) == NULL || *tmpdir == '\0') 162 tmpdir = _PATH_TMP; 163 for (i = strlen(tmpdir) - 1; i > 0 && tmpdir[i] == '/'; i--) 164 ; 165 i++; 166 if (asprintf(&TMPOUTNAME, "%.*s/patchoXXXXXXXXXX", i, tmpdir) == -1) 167 fatal("cannot allocate memory"); 168 if ((fd = mkstemp(TMPOUTNAME)) < 0) 169 pfatal("can't create %s", TMPOUTNAME); 170 close(fd); 171 172 if (asprintf(&TMPINNAME, "%.*s/patchiXXXXXXXXXX", i, tmpdir) == -1) 173 fatal("cannot allocate memory"); 174 if ((fd = mkstemp(TMPINNAME)) < 0) 175 pfatal("can't create %s", TMPINNAME); 176 close(fd); 177 178 if (asprintf(&TMPREJNAME, "%.*s/patchrXXXXXXXXXX", i, tmpdir) == -1) 179 fatal("cannot allocate memory"); 180 if ((fd = mkstemp(TMPREJNAME)) < 0) 181 pfatal("can't create %s", TMPREJNAME); 182 close(fd); 183 184 if (asprintf(&TMPPATNAME, "%.*s/patchpXXXXXXXXXX", i, tmpdir) == -1) 185 fatal("cannot allocate memory"); 186 if ((fd = mkstemp(TMPPATNAME)) < 0) 187 pfatal("can't create %s", TMPPATNAME); 188 close(fd); 189 190 v = getenv("SIMPLE_BACKUP_SUFFIX"); 191 if (v) 192 simple_backup_suffix = v; 193 else 194 simple_backup_suffix = ORIGEXT; 195 196 /* parse switches */ 197 Argc = argc; 198 Argv = argv; 199 get_some_switches(); 200 201 if (backup_type == none) { 202 if ((v = getenv("PATCH_VERSION_CONTROL")) == NULL) 203 v = getenv("VERSION_CONTROL"); 204 if (v != NULL || !posix) 205 backup_type = get_version(v); /* OK to pass NULL. */ 206 } 207 208 /* make sure we clean up /tmp in case of disaster */ 209 set_signals(0); 210 211 for (open_patch_file(filearg[1]); there_is_another_patch(); 212 reinitialize_almost_everything()) { 213 /* for each patch in patch file */ 214 215 warn_on_invalid_line = true; 216 217 if (outname == NULL) 218 outname = savestr(filearg[0]); 219 220 /* for ed script just up and do it and exit */ 221 if (diff_type == ED_DIFF) { 222 do_ed_script(); 223 continue; 224 } 225 /* initialize the patched file */ 226 if (!skip_rest_of_patch) 227 init_output(TMPOUTNAME); 228 229 /* initialize reject file */ 230 init_reject(TMPREJNAME); 231 232 /* find out where all the lines are */ 233 if (!skip_rest_of_patch) 234 scan_input(filearg[0]); 235 236 /* from here on, open no standard i/o files, because malloc */ 237 /* might misfire and we can't catch it easily */ 238 239 /* apply each hunk of patch */ 240 hunk = 0; 241 failed = 0; 242 out_of_mem = false; 243 while (another_hunk()) { 244 hunk++; 245 fuzz = 0; 246 mymaxfuzz = pch_context(); 247 if (maxfuzz < mymaxfuzz) 248 mymaxfuzz = maxfuzz; 249 if (!skip_rest_of_patch) { 250 do { 251 where = locate_hunk(fuzz); 252 if (hunk == 1 && where == 0 && !force) { 253 /* dwim for reversed patch? */ 254 if (!pch_swap()) { 255 if (fuzz == 0) 256 say("Not enough memory to try swapped hunk! Assuming unswapped.\n"); 257 continue; 258 } 259 reverse = !reverse; 260 /* try again */ 261 where = locate_hunk(fuzz); 262 if (where == 0) { 263 /* didn't find it swapped */ 264 if (!pch_swap()) 265 /* put it back to normal */ 266 fatal("lost hunk on alloc error!\n"); 267 reverse = !reverse; 268 } else if (noreverse) { 269 if (!pch_swap()) 270 /* put it back to normal */ 271 fatal("lost hunk on alloc error!\n"); 272 reverse = !reverse; 273 say("Ignoring previously applied (or reversed) patch.\n"); 274 skip_rest_of_patch = true; 275 } else if (batch) { 276 if (verbose) 277 say("%seversed (or previously applied) patch detected! %s -R.", 278 reverse ? "R" : "Unr", 279 reverse ? "Assuming" : "Ignoring"); 280 } else { 281 ask("%seversed (or previously applied) patch detected! %s -R? [y] ", 282 reverse ? "R" : "Unr", 283 reverse ? "Assume" : "Ignore"); 284 if (*buf == 'n') { 285 ask("Apply anyway? [n] "); 286 if (*buf != 'y') 287 skip_rest_of_patch = true; 288 where = 0; 289 reverse = !reverse; 290 if (!pch_swap()) 291 /* put it back to normal */ 292 fatal("lost hunk on alloc error!\n"); 293 } 294 } 295 } 296 } while (!skip_rest_of_patch && where == 0 && 297 ++fuzz <= mymaxfuzz); 298 299 if (skip_rest_of_patch) { /* just got decided */ 300 if (ferror(ofp) || fclose(ofp)) { 301 say("Error writing %s\n", 302 TMPOUTNAME); 303 error = 1; 304 } 305 ofp = NULL; 306 } 307 } 308 newwhere = pch_newfirst() + last_offset; 309 if (skip_rest_of_patch) { 310 abort_hunk(); 311 failed++; 312 if (verbose) 313 say("Hunk #%d ignored at %ld.\n", 314 hunk, newwhere); 315 } else if (where == 0) { 316 abort_hunk(); 317 failed++; 318 if (verbose) 319 say("Hunk #%d failed at %ld.\n", 320 hunk, newwhere); 321 } else { 322 apply_hunk(where); 323 if (verbose) { 324 say("Hunk #%d succeeded at %ld", 325 hunk, newwhere); 326 if (fuzz != 0) 327 say(" with fuzz %ld", fuzz); 328 if (last_offset) 329 say(" (offset %ld line%s)", 330 last_offset, 331 last_offset == 1L ? "" : "s"); 332 say(".\n"); 333 } 334 } 335 } 336 337 if (out_of_mem && using_plan_a) { 338 Argc = Argc_last; 339 Argv = Argv_last; 340 say("\n\nRan out of memory using Plan A--trying again...\n\n"); 341 if (ofp) 342 fclose(ofp); 343 ofp = NULL; 344 if (rejfp) 345 fclose(rejfp); 346 rejfp = NULL; 347 continue; 348 } 349 if (hunk == 0) 350 fatal("Internal error: hunk should not be 0\n"); 351 352 /* finish spewing out the new file */ 353 if (!skip_rest_of_patch && !spew_output()) { 354 say("Can't write %s\n", TMPOUTNAME); 355 error = 1; 356 } 357 358 /* and put the output where desired */ 359 ignore_signals(); 360 if (!skip_rest_of_patch) { 361 struct stat statbuf; 362 char *realout = outname; 363 364 if (!check_only) { 365 if (move_file(TMPOUTNAME, outname) < 0) { 366 toutkeep = true; 367 realout = TMPOUTNAME; 368 chmod(TMPOUTNAME, filemode); 369 } else 370 chmod(outname, filemode); 371 372 if (remove_empty_files && 373 stat(realout, &statbuf) == 0 && 374 statbuf.st_size == 0) { 375 if (verbose) 376 say("Removing %s (empty after patching).\n", 377 realout); 378 unlink(realout); 379 } 380 } 381 } 382 if (ferror(rejfp) || fclose(rejfp)) { 383 say("Error writing %s\n", rejname); 384 error = 1; 385 } 386 rejfp = NULL; 387 if (failed) { 388 error = 1; 389 if (*rejname == '\0') { 390 if (strlcpy(rejname, outname, 391 sizeof(rejname)) >= sizeof(rejname)) 392 fatal("filename %s is too long\n", outname); 393 if (strlcat(rejname, REJEXT, 394 sizeof(rejname)) >= sizeof(rejname)) 395 fatal("filename %s is too long\n", outname); 396 } 397 if (skip_rest_of_patch) { 398 say("%d out of %d hunks ignored--saving rejects to %s\n", 399 failed, hunk, rejname); 400 } else { 401 say("%d out of %d hunks failed--saving rejects to %s\n", 402 failed, hunk, rejname); 403 } 404 if (!check_only && move_file(TMPREJNAME, rejname) < 0) 405 trejkeep = true; 406 } 407 set_signals(1); 408 } 409 my_exit(error); 410 /* NOTREACHED */ 411 } 412 413 /* Prepare to find the next patch to do in the patch file. */ 414 415 static void 416 reinitialize_almost_everything(void) 417 { 418 re_patch(); 419 re_input(); 420 421 input_lines = 0; 422 last_frozen_line = 0; 423 424 filec = 0; 425 if (!out_of_mem) { 426 free(filearg[0]); 427 filearg[0] = NULL; 428 } 429 430 free(outname); 431 outname = NULL; 432 433 last_offset = 0; 434 diff_type = 0; 435 436 free(revision); 437 revision = NULL; 438 439 reverse = reverse_flag_specified; 440 skip_rest_of_patch = false; 441 442 get_some_switches(); 443 } 444 445 /* Process switches and filenames. */ 446 447 static void 448 get_some_switches(void) 449 { 450 const char *options = "b::B:cCd:D:eEfF:i:lnNo:p:r:RstuvV:x:z:"; 451 static struct option longopts[] = { 452 {"backup", no_argument, 0, 'b'}, 453 {"batch", no_argument, 0, 't'}, 454 {"check", no_argument, 0, 'C'}, 455 {"context", no_argument, 0, 'c'}, 456 {"debug", required_argument, 0, 'x'}, 457 {"directory", required_argument, 0, 'd'}, 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 = savestr(optarg); 503 break; 504 case 'B': 505 origprae = savestr(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) < 0) 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] = savestr(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 = savestr(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] = savestr(*Argv++); 600 Argc--; 601 while (Argc > 0) { 602 if (++filec == MAXFILEC) 603 fatal("too many file arguments\n"); 604 filearg[filec] = savestr(*Argv++); 605 Argc--; 606 } 607 } 608 609 if (getenv("POSIXLY_CORRECT") != NULL) 610 posix = 1; 611 } 612 613 static 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(EXIT_SUCCESS); 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 bool 961 spew_output(void) 962 { 963 int rv; 964 965 #ifdef DEBUGGING 966 if (debug & 256) 967 say("il=%ld lfl=%ld\n", input_lines, last_frozen_line); 968 #endif 969 if (input_lines) 970 copy_till(input_lines, true); /* dump remainder of file */ 971 rv = ferror(ofp) == 0 && fclose(ofp) == 0; 972 ofp = NULL; 973 return rv; 974 } 975 976 /* 977 * Copy one line from input to output. 978 */ 979 static void 980 dump_line(LINENUM line, bool write_newline) 981 { 982 char *s; 983 984 s = ifetch(line, 0); 985 if (s == NULL) 986 return; 987 /* Note: string is not NUL terminated. */ 988 for (; *s != '\n'; s++) 989 putc(*s, ofp); 990 if (write_newline) 991 putc('\n', ofp); 992 } 993 994 /* 995 * Does the patch pattern match at line base+offset? 996 */ 997 static bool 998 patch_match(LINENUM base, LINENUM offset, LINENUM fuzz) 999 { 1000 LINENUM pline = 1 + fuzz; 1001 LINENUM iline; 1002 LINENUM pat_lines = pch_ptrn_lines() - fuzz; 1003 const char *ilineptr; 1004 const char *plineptr; 1005 short plinelen; 1006 1007 for (iline = base + offset + fuzz; pline <= pat_lines; pline++, iline++) { 1008 ilineptr = ifetch(iline, offset >= 0); 1009 if (ilineptr == NULL) 1010 return false; 1011 plineptr = pfetch(pline); 1012 plinelen = pch_line_len(pline); 1013 if (canonicalize) { 1014 if (!similar(ilineptr, plineptr, plinelen)) 1015 return false; 1016 } else if (strnNE(ilineptr, plineptr, plinelen)) 1017 return false; 1018 if (iline == input_lines) { 1019 /* 1020 * We are looking at the last line of the file. 1021 * If the file has no eol, the patch line should 1022 * not have one either and vice-versa. Note that 1023 * plinelen > 0. 1024 */ 1025 if (last_line_missing_eol) { 1026 if (plineptr[plinelen - 1] == '\n') 1027 return false; 1028 } else { 1029 if (plineptr[plinelen - 1] != '\n') 1030 return false; 1031 } 1032 } 1033 } 1034 return true; 1035 } 1036 1037 /* 1038 * Do two lines match with canonicalized white space? 1039 */ 1040 static bool 1041 similar(const char *a, const char *b, int len) 1042 { 1043 while (len) { 1044 if (isspace((unsigned char)*b)) { /* whitespace (or \n) to match? */ 1045 if (!isspace((unsigned char)*a)) /* no corresponding whitespace? */ 1046 return false; 1047 while (len && isspace((unsigned char)*b) && *b != '\n') 1048 b++, len--; /* skip pattern whitespace */ 1049 while (isspace((unsigned char)*a) && *a != '\n') 1050 a++; /* skip target whitespace */ 1051 if (*a == '\n' || *b == '\n') 1052 return (*a == *b); /* should end in sync */ 1053 } else if (*a++ != *b++) /* match non-whitespace chars */ 1054 return false; 1055 else 1056 len--; /* probably not necessary */ 1057 } 1058 return true; /* actually, this is not reached */ 1059 /* since there is always a \n */ 1060 } 1061