1 /* 2 * $OpenBSD: patch.c,v 1.45 2007/04/18 21:52:24 sobrado Exp $ 3 */ 4 5 /* 6 * patch - a program to apply diffs to original files 7 * 8 * Copyright 1986, Larry Wall 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following condition is met: 12 * 1. Redistributions of source code must retain the above copyright notice, 13 * this condition and the following disclaimer. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY 16 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 17 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 18 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR 19 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 21 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 22 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 * 27 * -C option added in 1998, original code by Marc Espie, based on FreeBSD 28 * behaviour 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[MAXLINELEN]; /* general purpose buffer */ 52 size_t buf_len = sizeof(buf); 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 /* buffer for stderr */ 116 static char serrbuf[BUFSIZ]; 117 118 /* how many input lines have been irretractibly output */ 119 static LINENUM last_frozen_line = 0; 120 121 static int Argc; /* guess */ 122 static char **Argv; 123 static int Argc_last; /* for restarting plan_b */ 124 static char **Argv_last; 125 126 static FILE *ofp = NULL; /* output file pointer */ 127 static FILE *rejfp = NULL; /* reject file pointer */ 128 129 static int filec = 0; /* how many file arguments? */ 130 static LINENUM last_offset = 0; 131 static LINENUM maxfuzz = 2; 132 133 /* patch using ifdef, ifndef, etc. */ 134 static bool do_defines = false; 135 /* #ifdef xyzzy */ 136 static char if_defined[128]; 137 /* #ifndef xyzzy */ 138 static char not_defined[128]; 139 /* #else */ 140 static const char else_defined[] = "#else\n"; 141 /* #endif xyzzy */ 142 static char end_defined[128]; 143 144 145 /* Apply a set of diffs as appropriate. */ 146 147 int 148 main(int argc, char *argv[]) 149 { 150 int error = 0, hunk, failed, i, fd; 151 LINENUM where = 0, newwhere, fuzz, mymaxfuzz; 152 const char *tmpdir; 153 char *v; 154 155 setbuf(stderr, serrbuf); 156 for (i = 0; i < MAXFILEC; i++) 157 filearg[i] = NULL; 158 159 /* Cons up the names of the temporary files. */ 160 if ((tmpdir = getenv("TMPDIR")) == NULL || *tmpdir == '\0') 161 tmpdir = _PATH_TMP; 162 for (i = strlen(tmpdir) - 1; i > 0 && tmpdir[i] == '/'; i--) 163 ; 164 i++; 165 if (asprintf(&TMPOUTNAME, "%.*s/patchoXXXXXXXXXX", i, tmpdir) == -1) 166 fatal("cannot allocate memory"); 167 if ((fd = mkstemp(TMPOUTNAME)) < 0) 168 pfatal("can't create %s", TMPOUTNAME); 169 close(fd); 170 171 if (asprintf(&TMPINNAME, "%.*s/patchiXXXXXXXXXX", i, tmpdir) == -1) 172 fatal("cannot allocate memory"); 173 if ((fd = mkstemp(TMPINNAME)) < 0) 174 pfatal("can't create %s", TMPINNAME); 175 close(fd); 176 177 if (asprintf(&TMPREJNAME, "%.*s/patchrXXXXXXXXXX", i, tmpdir) == -1) 178 fatal("cannot allocate memory"); 179 if ((fd = mkstemp(TMPREJNAME)) < 0) 180 pfatal("can't create %s", TMPREJNAME); 181 close(fd); 182 183 if (asprintf(&TMPPATNAME, "%.*s/patchpXXXXXXXXXX", i, tmpdir) == -1) 184 fatal("cannot allocate memory"); 185 if ((fd = mkstemp(TMPPATNAME)) < 0) 186 pfatal("can't create %s", TMPPATNAME); 187 close(fd); 188 189 v = getenv("SIMPLE_BACKUP_SUFFIX"); 190 if (v) 191 simple_backup_suffix = v; 192 else 193 simple_backup_suffix = ORIGEXT; 194 195 /* parse switches */ 196 Argc = argc; 197 Argv = argv; 198 get_some_switches(); 199 200 if (backup_type == none) { 201 if ((v = getenv("PATCH_VERSION_CONTROL")) == NULL) 202 v = getenv("VERSION_CONTROL"); 203 if (v != NULL || !posix) 204 backup_type = get_version(v); /* OK to pass NULL. */ 205 } 206 207 /* make sure we clean up /tmp in case of disaster */ 208 set_signals(0); 209 210 for (open_patch_file(filearg[1]); there_is_another_patch(); 211 reinitialize_almost_everything()) { 212 /* for each patch in patch file */ 213 214 warn_on_invalid_line = true; 215 216 if (outname == NULL) 217 outname = savestr(filearg[0]); 218 219 /* for ed script just up and do it and exit */ 220 if (diff_type == ED_DIFF) { 221 do_ed_script(); 222 continue; 223 } 224 /* initialize the patched file */ 225 if (!skip_rest_of_patch) 226 init_output(TMPOUTNAME); 227 228 /* initialize reject file */ 229 init_reject(TMPREJNAME); 230 231 /* find out where all the lines are */ 232 if (!skip_rest_of_patch) 233 scan_input(filearg[0]); 234 235 /* from here on, open no standard i/o files, because malloc */ 236 /* might misfire and we can't catch it easily */ 237 238 /* apply each hunk of patch */ 239 hunk = 0; 240 failed = 0; 241 out_of_mem = false; 242 while (another_hunk()) { 243 hunk++; 244 fuzz = 0; 245 mymaxfuzz = pch_context(); 246 if (maxfuzz < mymaxfuzz) 247 mymaxfuzz = maxfuzz; 248 if (!skip_rest_of_patch) { 249 do { 250 where = locate_hunk(fuzz); 251 if (hunk == 1 && where == 0 && !force) { 252 /* dwim for reversed patch? */ 253 if (!pch_swap()) { 254 if (fuzz == 0) 255 say("Not enough memory to try swapped hunk! Assuming unswapped.\n"); 256 continue; 257 } 258 reverse = !reverse; 259 /* try again */ 260 where = locate_hunk(fuzz); 261 if (where == 0) { 262 /* didn't find it swapped */ 263 if (!pch_swap()) 264 /* put it back to normal */ 265 fatal("lost hunk on alloc error!\n"); 266 reverse = !reverse; 267 } else if (noreverse) { 268 if (!pch_swap()) 269 /* put it back to normal */ 270 fatal("lost hunk on alloc error!\n"); 271 reverse = !reverse; 272 say("Ignoring previously applied (or reversed) patch.\n"); 273 skip_rest_of_patch = true; 274 } else if (batch) { 275 if (verbose) 276 say("%seversed (or previously applied) patch detected! %s -R.", 277 reverse ? "R" : "Unr", 278 reverse ? "Assuming" : "Ignoring"); 279 } else { 280 ask("%seversed (or previously applied) patch detected! %s -R? [y] ", 281 reverse ? "R" : "Unr", 282 reverse ? "Assume" : "Ignore"); 283 if (*buf == 'n') { 284 ask("Apply anyway? [n] "); 285 if (*buf != 'y') 286 skip_rest_of_patch = true; 287 where = 0; 288 reverse = !reverse; 289 if (!pch_swap()) 290 /* put it back to normal */ 291 fatal("lost hunk on alloc error!\n"); 292 } 293 } 294 } 295 } while (!skip_rest_of_patch && where == 0 && 296 ++fuzz <= mymaxfuzz); 297 298 if (skip_rest_of_patch) { /* just got decided */ 299 if (ferror(ofp) || fclose(ofp)) { 300 say("Error writing %s\n", 301 TMPOUTNAME); 302 error = 1; 303 } 304 ofp = NULL; 305 } 306 } 307 newwhere = pch_newfirst() + last_offset; 308 if (skip_rest_of_patch) { 309 abort_hunk(); 310 failed++; 311 if (verbose) 312 say("Hunk #%d ignored at %ld.\n", 313 hunk, newwhere); 314 } else if (where == 0) { 315 abort_hunk(); 316 failed++; 317 if (verbose) 318 say("Hunk #%d failed at %ld.\n", 319 hunk, newwhere); 320 } else { 321 apply_hunk(where); 322 if (verbose) { 323 say("Hunk #%d succeeded at %ld", 324 hunk, newwhere); 325 if (fuzz != 0) 326 say(" with fuzz %ld", fuzz); 327 if (last_offset) 328 say(" (offset %ld line%s)", 329 last_offset, 330 last_offset == 1L ? "" : "s"); 331 say(".\n"); 332 } 333 } 334 } 335 336 if (out_of_mem && using_plan_a) { 337 Argc = Argc_last; 338 Argv = Argv_last; 339 say("\n\nRan out of memory using Plan A--trying again...\n\n"); 340 if (ofp) 341 fclose(ofp); 342 ofp = NULL; 343 if (rejfp) 344 fclose(rejfp); 345 rejfp = NULL; 346 continue; 347 } 348 if (hunk == 0) 349 fatal("Internal error: hunk should not be 0\n"); 350 351 /* finish spewing out the new file */ 352 if (!skip_rest_of_patch && !spew_output()) { 353 say("Can't write %s\n", TMPOUTNAME); 354 error = 1; 355 } 356 357 /* and put the output where desired */ 358 ignore_signals(); 359 if (!skip_rest_of_patch) { 360 struct stat statbuf; 361 char *realout = outname; 362 363 if (!check_only) { 364 if (move_file(TMPOUTNAME, outname) < 0) { 365 toutkeep = true; 366 realout = TMPOUTNAME; 367 chmod(TMPOUTNAME, filemode); 368 } else 369 chmod(outname, filemode); 370 371 if (remove_empty_files && 372 stat(realout, &statbuf) == 0 && 373 statbuf.st_size == 0) { 374 if (verbose) 375 say("Removing %s (empty after patching).\n", 376 realout); 377 unlink(realout); 378 } 379 } 380 } 381 if (ferror(rejfp) || fclose(rejfp)) { 382 say("Error writing %s\n", rejname); 383 error = 1; 384 } 385 rejfp = NULL; 386 if (failed) { 387 error = 1; 388 if (*rejname == '\0') { 389 if (strlcpy(rejname, outname, 390 sizeof(rejname)) >= sizeof(rejname)) 391 fatal("filename %s is too long\n", outname); 392 if (strlcat(rejname, REJEXT, 393 sizeof(rejname)) >= sizeof(rejname)) 394 fatal("filename %s is too long\n", outname); 395 } 396 if (!check_only) { 397 say("%d out of %d hunks %s--saving rejects to %s\n", 398 failed, hunk, skip_rest_of_patch ? "ignored" : "failed", rejname); 399 } else { 400 say("%d out of %d hunks %s\n", 401 failed, hunk, skip_rest_of_patch ? "ignored" : "failed"); 402 } 403 if (!check_only && move_file(TMPREJNAME, rejname) < 0) 404 trejkeep = true; 405 } 406 set_signals(1); 407 } 408 my_exit(error); 409 /* NOTREACHED */ 410 } 411 412 /* Prepare to find the next patch to do in the patch file. */ 413 414 static void 415 reinitialize_almost_everything(void) 416 { 417 re_patch(); 418 re_input(); 419 420 input_lines = 0; 421 last_frozen_line = 0; 422 423 filec = 0; 424 if (!out_of_mem) { 425 free(filearg[0]); 426 filearg[0] = NULL; 427 } 428 429 free(outname); 430 outname = NULL; 431 432 last_offset = 0; 433 diff_type = 0; 434 435 free(revision); 436 revision = NULL; 437 438 reverse = reverse_flag_specified; 439 skip_rest_of_patch = false; 440 441 get_some_switches(); 442 } 443 444 /* Process switches and filenames. */ 445 446 static void 447 get_some_switches(void) 448 { 449 const char *options = "b::B:cCd:D:eEfF:i:lnNo:p:r:RstuvV:x:z:"; 450 static struct option longopts[] = { 451 {"backup", no_argument, 0, 'b'}, 452 {"batch", no_argument, 0, 't'}, 453 {"check", no_argument, 0, 'C'}, 454 {"context", no_argument, 0, 'c'}, 455 {"debug", required_argument, 0, 'x'}, 456 {"directory", required_argument, 0, 'd'}, 457 {"ed", no_argument, 0, 'e'}, 458 {"force", no_argument, 0, 'f'}, 459 {"forward", no_argument, 0, 'N'}, 460 {"fuzz", required_argument, 0, 'F'}, 461 {"ifdef", required_argument, 0, 'D'}, 462 {"input", required_argument, 0, 'i'}, 463 {"ignore-whitespace", no_argument, 0, 'l'}, 464 {"normal", no_argument, 0, 'n'}, 465 {"output", required_argument, 0, 'o'}, 466 {"prefix", required_argument, 0, 'B'}, 467 {"quiet", no_argument, 0, 's'}, 468 {"reject-file", required_argument, 0, 'r'}, 469 {"remove-empty-files", no_argument, 0, 'E'}, 470 {"reverse", no_argument, 0, 'R'}, 471 {"silent", no_argument, 0, 's'}, 472 {"strip", required_argument, 0, 'p'}, 473 {"suffix", required_argument, 0, 'z'}, 474 {"unified", no_argument, 0, 'u'}, 475 {"version", no_argument, 0, 'v'}, 476 {"version-control", required_argument, 0, 'V'}, 477 {"posix", no_argument, &posix, 1}, 478 {NULL, 0, 0, 0} 479 }; 480 int ch; 481 482 rejname[0] = '\0'; 483 Argc_last = Argc; 484 Argv_last = Argv; 485 if (!Argc) 486 return; 487 optreset = optind = 1; 488 while ((ch = getopt_long(Argc, Argv, options, longopts, NULL)) != -1) { 489 switch (ch) { 490 case 'b': 491 if (backup_type == none) 492 backup_type = numbered_existing; 493 if (optarg == NULL) 494 break; 495 if (verbose) 496 say("Warning, the ``-b suffix'' option has been" 497 " obsoleted by the -z option.\n"); 498 /* FALLTHROUGH */ 499 case 'z': 500 /* must directly follow 'b' case for backwards compat */ 501 simple_backup_suffix = savestr(optarg); 502 break; 503 case 'B': 504 origprae = savestr(optarg); 505 break; 506 case 'c': 507 diff_type = CONTEXT_DIFF; 508 break; 509 case 'C': 510 check_only = true; 511 break; 512 case 'd': 513 if (chdir(optarg) < 0) 514 pfatal("can't cd to %s", optarg); 515 break; 516 case 'D': 517 do_defines = true; 518 if (!isalpha((unsigned char)*optarg) && *optarg != '_') 519 fatal("argument to -D is not an identifier\n"); 520 snprintf(if_defined, sizeof if_defined, 521 "#ifdef %s\n", optarg); 522 snprintf(not_defined, sizeof not_defined, 523 "#ifndef %s\n", optarg); 524 snprintf(end_defined, sizeof end_defined, 525 "#endif /* %s */\n", optarg); 526 break; 527 case 'e': 528 diff_type = ED_DIFF; 529 break; 530 case 'E': 531 remove_empty_files = true; 532 break; 533 case 'f': 534 force = true; 535 break; 536 case 'F': 537 maxfuzz = atoi(optarg); 538 break; 539 case 'i': 540 if (++filec == MAXFILEC) 541 fatal("too many file arguments\n"); 542 filearg[filec] = savestr(optarg); 543 break; 544 case 'l': 545 canonicalize = true; 546 break; 547 case 'n': 548 diff_type = NORMAL_DIFF; 549 break; 550 case 'N': 551 noreverse = true; 552 break; 553 case 'o': 554 outname = savestr(optarg); 555 break; 556 case 'p': 557 strippath = atoi(optarg); 558 break; 559 case 'r': 560 if (strlcpy(rejname, optarg, 561 sizeof(rejname)) >= sizeof(rejname)) 562 fatal("argument for -r is too long\n"); 563 break; 564 case 'R': 565 reverse = true; 566 reverse_flag_specified = true; 567 break; 568 case 's': 569 verbose = false; 570 break; 571 case 't': 572 batch = true; 573 break; 574 case 'u': 575 diff_type = UNI_DIFF; 576 break; 577 case 'v': 578 version(); 579 break; 580 case 'V': 581 backup_type = get_version(optarg); 582 break; 583 #ifdef DEBUGGING 584 case 'x': 585 debug = atoi(optarg); 586 break; 587 #endif 588 default: 589 if (ch != '\0') 590 usage(); 591 break; 592 } 593 } 594 Argc -= optind; 595 Argv += optind; 596 597 if (Argc > 0) { 598 filearg[0] = savestr(*Argv++); 599 Argc--; 600 while (Argc > 0) { 601 if (++filec == MAXFILEC) 602 fatal("too many file arguments\n"); 603 filearg[filec] = savestr(*Argv++); 604 Argc--; 605 } 606 } 607 608 if (getenv("POSIXLY_CORRECT") != NULL) 609 posix = 1; 610 } 611 612 static void 613 usage(void) 614 { 615 fprintf(stderr, 616 "usage: patch [-bCcEeflNnRstuv] [-B backup-prefix] [-D symbol] [-d directory]\n" 617 " [-F max-fuzz] [-i patchfile] [-o out-file] [-p strip-count]\n" 618 " [-r rej-name] [-V t | nil | never] [-x number] [-z backup-ext]\n" 619 " [--posix] [origfile [patchfile]]\n" 620 " patch <patchfile\n"); 621 my_exit(EXIT_SUCCESS); 622 } 623 624 /* 625 * Attempt to find the right place to apply this hunk of patch. 626 */ 627 static LINENUM 628 locate_hunk(LINENUM fuzz) 629 { 630 LINENUM first_guess = pch_first() + last_offset; 631 LINENUM offset; 632 LINENUM pat_lines = pch_ptrn_lines(); 633 LINENUM max_pos_offset = input_lines - first_guess - pat_lines + 1; 634 LINENUM max_neg_offset = first_guess - last_frozen_line - 1 + pch_context(); 635 636 if (pat_lines == 0) { /* null range matches always */ 637 if (verbose && fuzz == 0 && (diff_type == CONTEXT_DIFF 638 || diff_type == NEW_CONTEXT_DIFF 639 || diff_type == UNI_DIFF)) { 640 say("Empty context always matches.\n"); 641 } 642 return (first_guess); 643 } 644 if (max_neg_offset >= first_guess) /* do not try lines < 0 */ 645 max_neg_offset = first_guess - 1; 646 if (first_guess <= input_lines && patch_match(first_guess, 0, fuzz)) 647 return first_guess; 648 for (offset = 1; ; offset++) { 649 bool check_after = (offset <= max_pos_offset); 650 bool check_before = (offset <= max_neg_offset); 651 652 if (check_after && patch_match(first_guess, offset, fuzz)) { 653 #ifdef DEBUGGING 654 if (debug & 1) 655 say("Offset changing from %ld to %ld\n", 656 last_offset, offset); 657 #endif 658 last_offset = offset; 659 return first_guess + offset; 660 } else if (check_before && patch_match(first_guess, -offset, fuzz)) { 661 #ifdef DEBUGGING 662 if (debug & 1) 663 say("Offset changing from %ld to %ld\n", 664 last_offset, -offset); 665 #endif 666 last_offset = -offset; 667 return first_guess - offset; 668 } else if (!check_before && !check_after) 669 return 0; 670 } 671 } 672 673 /* We did not find the pattern, dump out the hunk so they can handle it. */ 674 675 static void 676 abort_context_hunk(void) 677 { 678 LINENUM i; 679 const LINENUM pat_end = pch_end(); 680 /* 681 * add in last_offset to guess the same as the previous successful 682 * hunk 683 */ 684 const LINENUM oldfirst = pch_first() + last_offset; 685 const LINENUM newfirst = pch_newfirst() + last_offset; 686 const LINENUM oldlast = oldfirst + pch_ptrn_lines() - 1; 687 const LINENUM newlast = newfirst + pch_repl_lines() - 1; 688 const char *stars = (diff_type >= NEW_CONTEXT_DIFF ? " ****" : ""); 689 const char *minuses = (diff_type >= NEW_CONTEXT_DIFF ? " ----" : " -----"); 690 691 fprintf(rejfp, "***************\n"); 692 for (i = 0; i <= pat_end; i++) { 693 switch (pch_char(i)) { 694 case '*': 695 if (oldlast < oldfirst) 696 fprintf(rejfp, "*** 0%s\n", stars); 697 else if (oldlast == oldfirst) 698 fprintf(rejfp, "*** %ld%s\n", oldfirst, stars); 699 else 700 fprintf(rejfp, "*** %ld,%ld%s\n", oldfirst, 701 oldlast, stars); 702 break; 703 case '=': 704 if (newlast < newfirst) 705 fprintf(rejfp, "--- 0%s\n", minuses); 706 else if (newlast == newfirst) 707 fprintf(rejfp, "--- %ld%s\n", newfirst, minuses); 708 else 709 fprintf(rejfp, "--- %ld,%ld%s\n", newfirst, 710 newlast, minuses); 711 break; 712 case '\n': 713 fprintf(rejfp, "%s", pfetch(i)); 714 break; 715 case ' ': 716 case '-': 717 case '+': 718 case '!': 719 fprintf(rejfp, "%c %s", pch_char(i), pfetch(i)); 720 break; 721 default: 722 fatal("fatal internal error in abort_context_hunk\n"); 723 } 724 } 725 } 726 727 static void 728 rej_line(int ch, LINENUM i) 729 { 730 size_t len; 731 const char *line = pfetch(i); 732 733 len = strlen(line); 734 735 fprintf(rejfp, "%c%s", ch, line); 736 if (len == 0 || line[len-1] != '\n') 737 fprintf(rejfp, "\n\\ No newline at end of file\n"); 738 } 739 740 static void 741 abort_hunk(void) 742 { 743 LINENUM i, j, split; 744 int ch1, ch2; 745 const LINENUM pat_end = pch_end(); 746 const LINENUM oldfirst = pch_first() + last_offset; 747 const LINENUM newfirst = pch_newfirst() + last_offset; 748 749 if (diff_type != UNI_DIFF) { 750 abort_context_hunk(); 751 return; 752 } 753 split = -1; 754 for (i = 0; i <= pat_end; i++) { 755 if (pch_char(i) == '=') { 756 split = i; 757 break; 758 } 759 } 760 if (split == -1) { 761 fprintf(rejfp, "malformed hunk: no split found\n"); 762 return; 763 } 764 i = 0; 765 j = split + 1; 766 fprintf(rejfp, "@@ -%ld,%ld +%ld,%ld @@\n", 767 pch_ptrn_lines() ? oldfirst : 0, 768 pch_ptrn_lines(), newfirst, pch_repl_lines()); 769 while (i < split || j <= pat_end) { 770 ch1 = i < split ? pch_char(i) : -1; 771 ch2 = j <= pat_end ? pch_char(j) : -1; 772 if (ch1 == '-') { 773 rej_line('-', i); 774 i++; 775 } else if (ch1 == ' ' && ch2 == ' ') { 776 rej_line(' ', i); 777 i++; 778 j++; 779 } else if (ch1 == '!' && ch2 == '!') { 780 while (i < split && ch1 == '!') { 781 rej_line('-', i); 782 i++; 783 ch1 = i < split ? pch_char(i) : -1; 784 } 785 while (j <= pat_end && ch2 == '!') { 786 rej_line('+', j); 787 j++; 788 ch2 = j <= pat_end ? pch_char(j) : -1; 789 } 790 } else if (ch1 == '*') { 791 i++; 792 } else if (ch2 == '+' || ch2 == ' ') { 793 rej_line(ch2, j); 794 j++; 795 } else { 796 fprintf(rejfp, "internal error on (%ld %ld %ld)\n", 797 i, split, j); 798 rej_line(ch1, i); 799 rej_line(ch2, j); 800 return; 801 } 802 } 803 } 804 805 /* We found where to apply it (we hope), so do it. */ 806 807 static void 808 apply_hunk(LINENUM where) 809 { 810 LINENUM old = 1; 811 const LINENUM lastline = pch_ptrn_lines(); 812 LINENUM new = lastline + 1; 813 #define OUTSIDE 0 814 #define IN_IFNDEF 1 815 #define IN_IFDEF 2 816 #define IN_ELSE 3 817 int def_state = OUTSIDE; 818 const LINENUM pat_end = pch_end(); 819 820 where--; 821 while (pch_char(new) == '=' || pch_char(new) == '\n') 822 new++; 823 824 while (old <= lastline) { 825 if (pch_char(old) == '-') { 826 copy_till(where + old - 1, false); 827 if (do_defines) { 828 if (def_state == OUTSIDE) { 829 fputs(not_defined, ofp); 830 def_state = IN_IFNDEF; 831 } else if (def_state == IN_IFDEF) { 832 fputs(else_defined, ofp); 833 def_state = IN_ELSE; 834 } 835 fputs(pfetch(old), ofp); 836 } 837 last_frozen_line++; 838 old++; 839 } else if (new > pat_end) { 840 break; 841 } else if (pch_char(new) == '+') { 842 copy_till(where + old - 1, false); 843 if (do_defines) { 844 if (def_state == IN_IFNDEF) { 845 fputs(else_defined, ofp); 846 def_state = IN_ELSE; 847 } else if (def_state == OUTSIDE) { 848 fputs(if_defined, ofp); 849 def_state = IN_IFDEF; 850 } 851 } 852 fputs(pfetch(new), ofp); 853 new++; 854 } else if (pch_char(new) != pch_char(old)) { 855 say("Out-of-sync patch, lines %ld,%ld--mangled text or line numbers, maybe?\n", 856 pch_hunk_beg() + old, 857 pch_hunk_beg() + new); 858 #ifdef DEBUGGING 859 say("oldchar = '%c', newchar = '%c'\n", 860 pch_char(old), pch_char(new)); 861 #endif 862 my_exit(2); 863 } else if (pch_char(new) == '!') { 864 copy_till(where + old - 1, false); 865 if (do_defines) { 866 fputs(not_defined, ofp); 867 def_state = IN_IFNDEF; 868 } 869 while (pch_char(old) == '!') { 870 if (do_defines) { 871 fputs(pfetch(old), ofp); 872 } 873 last_frozen_line++; 874 old++; 875 } 876 if (do_defines) { 877 fputs(else_defined, ofp); 878 def_state = IN_ELSE; 879 } 880 while (pch_char(new) == '!') { 881 fputs(pfetch(new), ofp); 882 new++; 883 } 884 } else { 885 if (pch_char(new) != ' ') 886 fatal("Internal error: expected ' '\n"); 887 old++; 888 new++; 889 if (do_defines && def_state != OUTSIDE) { 890 fputs(end_defined, ofp); 891 def_state = OUTSIDE; 892 } 893 } 894 } 895 if (new <= pat_end && pch_char(new) == '+') { 896 copy_till(where + old - 1, false); 897 if (do_defines) { 898 if (def_state == OUTSIDE) { 899 fputs(if_defined, ofp); 900 def_state = IN_IFDEF; 901 } else if (def_state == IN_IFNDEF) { 902 fputs(else_defined, ofp); 903 def_state = IN_ELSE; 904 } 905 } 906 while (new <= pat_end && pch_char(new) == '+') { 907 fputs(pfetch(new), ofp); 908 new++; 909 } 910 } 911 if (do_defines && def_state != OUTSIDE) { 912 fputs(end_defined, ofp); 913 } 914 } 915 916 /* 917 * Open the new file. 918 */ 919 static void 920 init_output(const char *name) 921 { 922 ofp = fopen(name, "w"); 923 if (ofp == NULL) 924 pfatal("can't create %s", name); 925 } 926 927 /* 928 * Open a file to put hunks we can't locate. 929 */ 930 static void 931 init_reject(const char *name) 932 { 933 rejfp = fopen(name, "w"); 934 if (rejfp == NULL) 935 pfatal("can't create %s", name); 936 } 937 938 /* 939 * Copy input file to output, up to wherever hunk is to be applied. 940 * If endoffile is true, treat the last line specially since it may 941 * lack a newline. 942 */ 943 static void 944 copy_till(LINENUM lastline, bool endoffile) 945 { 946 if (last_frozen_line > lastline) 947 fatal("misordered hunks! output would be garbled\n"); 948 while (last_frozen_line < lastline) { 949 if (++last_frozen_line == lastline && endoffile) 950 dump_line(last_frozen_line, !last_line_missing_eol); 951 else 952 dump_line(last_frozen_line, true); 953 } 954 } 955 956 /* 957 * Finish copying the input file to the output file. 958 */ 959 static bool 960 spew_output(void) 961 { 962 int rv; 963 964 #ifdef DEBUGGING 965 if (debug & 256) 966 say("il=%ld lfl=%ld\n", input_lines, last_frozen_line); 967 #endif 968 if (input_lines) 969 copy_till(input_lines, true); /* dump remainder of file */ 970 rv = ferror(ofp) == 0 && fclose(ofp) == 0; 971 ofp = NULL; 972 return rv; 973 } 974 975 /* 976 * Copy one line from input to output. 977 */ 978 static void 979 dump_line(LINENUM line, bool write_newline) 980 { 981 char *s; 982 983 s = ifetch(line, 0); 984 if (s == NULL) 985 return; 986 /* Note: string is not NUL terminated. */ 987 for (; *s != '\n'; s++) 988 putc(*s, ofp); 989 if (write_newline) 990 putc('\n', ofp); 991 } 992 993 /* 994 * Does the patch pattern match at line base+offset? 995 */ 996 static bool 997 patch_match(LINENUM base, LINENUM offset, LINENUM fuzz) 998 { 999 LINENUM pline = 1 + fuzz; 1000 LINENUM iline; 1001 LINENUM pat_lines = pch_ptrn_lines() - fuzz; 1002 const char *ilineptr; 1003 const char *plineptr; 1004 short plinelen; 1005 1006 for (iline = base + offset + fuzz; pline <= pat_lines; pline++, iline++) { 1007 ilineptr = ifetch(iline, offset >= 0); 1008 if (ilineptr == NULL) 1009 return false; 1010 plineptr = pfetch(pline); 1011 plinelen = pch_line_len(pline); 1012 if (canonicalize) { 1013 if (!similar(ilineptr, plineptr, plinelen)) 1014 return false; 1015 } else if (strnNE(ilineptr, plineptr, plinelen)) 1016 return false; 1017 if (iline == input_lines) { 1018 /* 1019 * We are looking at the last line of the file. 1020 * If the file has no eol, the patch line should 1021 * not have one either and vice-versa. Note that 1022 * plinelen > 0. 1023 */ 1024 if (last_line_missing_eol) { 1025 if (plineptr[plinelen - 1] == '\n') 1026 return false; 1027 } else { 1028 if (plineptr[plinelen - 1] != '\n') 1029 return false; 1030 } 1031 } 1032 } 1033 return true; 1034 } 1035 1036 /* 1037 * Do two lines match with canonicalized white space? 1038 */ 1039 static bool 1040 similar(const char *a, const char *b, int len) 1041 { 1042 while (len) { 1043 if (isspace((unsigned char)*b)) { /* whitespace (or \n) to match? */ 1044 if (!isspace((unsigned char)*a)) /* no corresponding whitespace? */ 1045 return false; 1046 while (len && isspace((unsigned char)*b) && *b != '\n') 1047 b++, len--; /* skip pattern whitespace */ 1048 while (isspace((unsigned char)*a) && *a != '\n') 1049 a++; /* skip target whitespace */ 1050 if (*a == '\n' || *b == '\n') 1051 return (*a == *b); /* should end in sync */ 1052 } else if (*a++ != *b++) /* match non-whitespace chars */ 1053 return false; 1054 else 1055 len--; /* probably not necessary */ 1056 } 1057 return true; /* actually, this is not reached */ 1058 /* since there is always a \n */ 1059 } 1060