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 1.8 2008/08/10 23:01:51 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 void 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 fclose(ofp); 301 ofp = NULL; 302 } 303 } 304 newwhere = pch_newfirst() + last_offset; 305 if (skip_rest_of_patch) { 306 abort_hunk(); 307 failed++; 308 if (verbose) 309 say("Hunk #%d ignored at %ld.\n", 310 hunk, newwhere); 311 } else if (where == 0) { 312 abort_hunk(); 313 failed++; 314 if (verbose) 315 say("Hunk #%d failed at %ld.\n", 316 hunk, newwhere); 317 } else { 318 apply_hunk(where); 319 if (verbose) { 320 say("Hunk #%d succeeded at %ld", 321 hunk, newwhere); 322 if (fuzz != 0) 323 say(" with fuzz %ld", fuzz); 324 if (last_offset) 325 say(" (offset %ld line%s)", 326 last_offset, 327 last_offset == 1L ? "" : "s"); 328 say(".\n"); 329 } 330 } 331 } 332 333 if (out_of_mem && using_plan_a) { 334 Argc = Argc_last; 335 Argv = Argv_last; 336 say("\n\nRan out of memory using Plan A--trying again...\n\n"); 337 if (ofp) 338 fclose(ofp); 339 ofp = NULL; 340 if (rejfp) 341 fclose(rejfp); 342 rejfp = NULL; 343 continue; 344 } 345 if (hunk == 0) 346 fatal("Internal error: hunk should not be 0\n"); 347 348 /* finish spewing out the new file */ 349 if (!skip_rest_of_patch) 350 spew_output(); 351 352 /* and put the output where desired */ 353 ignore_signals(); 354 if (!skip_rest_of_patch) { 355 struct stat statbuf; 356 char *realout = outname; 357 358 if (!check_only) { 359 if (move_file(TMPOUTNAME, outname) < 0) { 360 toutkeep = true; 361 realout = TMPOUTNAME; 362 chmod(TMPOUTNAME, filemode); 363 } else 364 chmod(outname, filemode); 365 366 if (remove_empty_files && 367 stat(realout, &statbuf) == 0 && 368 statbuf.st_size == 0) { 369 if (verbose) 370 say("Removing %s (empty after patching).\n", 371 realout); 372 unlink(realout); 373 } 374 } 375 } 376 fclose(rejfp); 377 rejfp = NULL; 378 if (failed) { 379 error = 1; 380 if (*rejname == '\0') { 381 if (strlcpy(rejname, outname, 382 sizeof(rejname)) >= sizeof(rejname)) 383 fatal("filename %s is too long\n", outname); 384 if (strlcat(rejname, REJEXT, 385 sizeof(rejname)) >= sizeof(rejname)) 386 fatal("filename %s is too long\n", outname); 387 } 388 if (skip_rest_of_patch) { 389 say("%d out of %d hunks ignored--saving rejects to %s\n", 390 failed, hunk, rejname); 391 } else { 392 say("%d out of %d hunks failed--saving rejects to %s\n", 393 failed, hunk, rejname); 394 } 395 if (!check_only && move_file(TMPREJNAME, rejname) < 0) 396 trejkeep = true; 397 } 398 set_signals(1); 399 } 400 my_exit(error); 401 /* NOTREACHED */ 402 } 403 404 /* Prepare to find the next patch to do in the patch file. */ 405 406 static void 407 reinitialize_almost_everything(void) 408 { 409 re_patch(); 410 re_input(); 411 412 input_lines = 0; 413 last_frozen_line = 0; 414 415 filec = 0; 416 if (!out_of_mem) { 417 free(filearg[0]); 418 filearg[0] = NULL; 419 } 420 421 free(outname); 422 outname = NULL; 423 424 last_offset = 0; 425 diff_type = 0; 426 427 free(revision); 428 revision = NULL; 429 430 reverse = reverse_flag_specified; 431 skip_rest_of_patch = false; 432 433 get_some_switches(); 434 } 435 436 /* Process switches and filenames. */ 437 438 static void 439 get_some_switches(void) 440 { 441 const char *options = "b::B:cCd:D:eEfF:i:lnNo:p:r:RstuvV:x:z:"; 442 static struct option longopts[] = { 443 {"backup", no_argument, 0, 'b'}, 444 {"batch", no_argument, 0, 't'}, 445 {"check", no_argument, 0, 'C'}, 446 {"context", no_argument, 0, 'c'}, 447 {"debug", required_argument, 0, 'x'}, 448 {"directory", required_argument, 0, 'd'}, 449 {"ed", no_argument, 0, 'e'}, 450 {"force", no_argument, 0, 'f'}, 451 {"forward", no_argument, 0, 'N'}, 452 {"fuzz", required_argument, 0, 'F'}, 453 {"ifdef", required_argument, 0, 'D'}, 454 {"input", required_argument, 0, 'i'}, 455 {"ignore-whitespace", no_argument, 0, 'l'}, 456 {"normal", no_argument, 0, 'n'}, 457 {"output", required_argument, 0, 'o'}, 458 {"prefix", required_argument, 0, 'B'}, 459 {"quiet", no_argument, 0, 's'}, 460 {"reject-file", required_argument, 0, 'r'}, 461 {"remove-empty-files", no_argument, 0, 'E'}, 462 {"reverse", no_argument, 0, 'R'}, 463 {"silent", no_argument, 0, 's'}, 464 {"strip", required_argument, 0, 'p'}, 465 {"suffix", required_argument, 0, 'z'}, 466 {"unified", no_argument, 0, 'u'}, 467 {"version", no_argument, 0, 'v'}, 468 {"version-control", required_argument, 0, 'V'}, 469 {"posix", no_argument, &posix, 1}, 470 {NULL, 0, 0, 0} 471 }; 472 int ch; 473 474 rejname[0] = '\0'; 475 Argc_last = Argc; 476 Argv_last = Argv; 477 if (!Argc) 478 return; 479 optreset = optind = 1; 480 while ((ch = getopt_long(Argc, Argv, options, longopts, NULL)) != -1) { 481 switch (ch) { 482 case 'b': 483 if (backup_type == none) 484 backup_type = numbered_existing; 485 if (optarg == NULL) 486 break; 487 if (verbose) 488 say("Warning, the ``-b suffix'' option has been" 489 " obsoleted by the -z option.\n"); 490 /* FALLTHROUGH */ 491 case 'z': 492 /* must directly follow 'b' case for backwards compat */ 493 simple_backup_suffix = savestr(optarg); 494 break; 495 case 'B': 496 origprae = savestr(optarg); 497 break; 498 case 'c': 499 diff_type = CONTEXT_DIFF; 500 break; 501 case 'C': 502 check_only = true; 503 break; 504 case 'd': 505 if (chdir(optarg) < 0) 506 pfatal("can't cd to %s", optarg); 507 break; 508 case 'D': 509 do_defines = true; 510 if (!isalpha((unsigned char)*optarg) && *optarg != '_') 511 fatal("argument to -D is not an identifier\n"); 512 snprintf(if_defined, sizeof if_defined, 513 "#ifdef %s\n", optarg); 514 snprintf(not_defined, sizeof not_defined, 515 "#ifndef %s\n", optarg); 516 snprintf(end_defined, sizeof end_defined, 517 "#endif /* %s */\n", optarg); 518 break; 519 case 'e': 520 diff_type = ED_DIFF; 521 break; 522 case 'E': 523 remove_empty_files = true; 524 break; 525 case 'f': 526 force = true; 527 break; 528 case 'F': 529 maxfuzz = atoi(optarg); 530 break; 531 case 'i': 532 if (++filec == MAXFILEC) 533 fatal("too many file arguments\n"); 534 filearg[filec] = savestr(optarg); 535 break; 536 case 'l': 537 canonicalize = true; 538 break; 539 case 'n': 540 diff_type = NORMAL_DIFF; 541 break; 542 case 'N': 543 noreverse = true; 544 break; 545 case 'o': 546 outname = savestr(optarg); 547 break; 548 case 'p': 549 strippath = atoi(optarg); 550 break; 551 case 'r': 552 if (strlcpy(rejname, optarg, 553 sizeof(rejname)) >= sizeof(rejname)) 554 fatal("argument for -r is too long\n"); 555 break; 556 case 'R': 557 reverse = true; 558 reverse_flag_specified = true; 559 break; 560 case 's': 561 verbose = false; 562 break; 563 case 't': 564 batch = true; 565 break; 566 case 'u': 567 diff_type = UNI_DIFF; 568 break; 569 case 'v': 570 version(); 571 break; 572 case 'V': 573 backup_type = get_version(optarg); 574 break; 575 #ifdef DEBUGGING 576 case 'x': 577 debug = atoi(optarg); 578 break; 579 #endif 580 default: 581 if (ch != '\0') 582 usage(); 583 break; 584 } 585 } 586 Argc -= optind; 587 Argv += optind; 588 589 if (Argc > 0) { 590 filearg[0] = savestr(*Argv++); 591 Argc--; 592 while (Argc > 0) { 593 if (++filec == MAXFILEC) 594 fatal("too many file arguments\n"); 595 filearg[filec] = savestr(*Argv++); 596 Argc--; 597 } 598 } 599 600 if (getenv("POSIXLY_CORRECT") != NULL) 601 posix = 1; 602 } 603 604 static void 605 usage(void) 606 { 607 fprintf(stderr, 608 "usage: patch [-bCcEeflNnRstuv] [-B backup-prefix] [-D symbol] [-d directory]\n" 609 " [-F max-fuzz] [-i patchfile] [-o out-file] [-p strip-count]\n" 610 " [-r rej-name] [-V t | nil | never] [-x number] [-z backup-ext]\n" 611 " [--posix] [origfile [patchfile]]\n" 612 " patch <patchfile\n"); 613 my_exit(EXIT_SUCCESS); 614 } 615 616 /* 617 * Attempt to find the right place to apply this hunk of patch. 618 */ 619 static LINENUM 620 locate_hunk(LINENUM fuzz) 621 { 622 LINENUM first_guess = pch_first() + last_offset; 623 LINENUM offset; 624 LINENUM pat_lines = pch_ptrn_lines(); 625 LINENUM max_pos_offset = input_lines - first_guess - pat_lines + 1; 626 LINENUM max_neg_offset = first_guess - last_frozen_line - 1 + pch_context(); 627 628 if (pat_lines == 0) { /* null range matches always */ 629 if (verbose && fuzz == 0 && (diff_type == CONTEXT_DIFF 630 || diff_type == NEW_CONTEXT_DIFF 631 || diff_type == UNI_DIFF)) { 632 say("Empty context always matches.\n"); 633 } 634 return (first_guess); 635 } 636 if (max_neg_offset >= first_guess) /* do not try lines < 0 */ 637 max_neg_offset = first_guess - 1; 638 if (first_guess <= input_lines && patch_match(first_guess, 0, fuzz)) 639 return first_guess; 640 for (offset = 1; ; offset++) { 641 bool check_after = (offset <= max_pos_offset); 642 bool check_before = (offset <= max_neg_offset); 643 644 if (check_after && patch_match(first_guess, offset, fuzz)) { 645 #ifdef DEBUGGING 646 if (debug & 1) 647 say("Offset changing from %ld to %ld\n", 648 last_offset, offset); 649 #endif 650 last_offset = offset; 651 return first_guess + offset; 652 } else if (check_before && 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 && !check_after) 661 return 0; 662 } 663 } 664 665 /* We did not find the pattern, dump out the hunk so they can handle it. */ 666 667 static void 668 abort_context_hunk(void) 669 { 670 LINENUM i; 671 const LINENUM pat_end = pch_end(); 672 /* 673 * add in last_offset to guess the same as the previous successful 674 * hunk 675 */ 676 const LINENUM oldfirst = pch_first() + last_offset; 677 const LINENUM newfirst = pch_newfirst() + last_offset; 678 const LINENUM oldlast = oldfirst + pch_ptrn_lines() - 1; 679 const LINENUM newlast = newfirst + pch_repl_lines() - 1; 680 const char *stars = (diff_type >= NEW_CONTEXT_DIFF ? " ****" : ""); 681 const char *minuses = (diff_type >= NEW_CONTEXT_DIFF ? " ----" : " -----"); 682 683 fprintf(rejfp, "***************\n"); 684 for (i = 0; i <= pat_end; i++) { 685 switch (pch_char(i)) { 686 case '*': 687 if (oldlast < oldfirst) 688 fprintf(rejfp, "*** 0%s\n", stars); 689 else if (oldlast == oldfirst) 690 fprintf(rejfp, "*** %ld%s\n", oldfirst, stars); 691 else 692 fprintf(rejfp, "*** %ld,%ld%s\n", oldfirst, 693 oldlast, stars); 694 break; 695 case '=': 696 if (newlast < newfirst) 697 fprintf(rejfp, "--- 0%s\n", minuses); 698 else if (newlast == newfirst) 699 fprintf(rejfp, "--- %ld%s\n", newfirst, minuses); 700 else 701 fprintf(rejfp, "--- %ld,%ld%s\n", newfirst, 702 newlast, minuses); 703 break; 704 case '\n': 705 fprintf(rejfp, "%s", pfetch(i)); 706 break; 707 case ' ': 708 case '-': 709 case '+': 710 case '!': 711 fprintf(rejfp, "%c %s", pch_char(i), pfetch(i)); 712 break; 713 default: 714 fatal("fatal internal error in abort_context_hunk\n"); 715 } 716 } 717 } 718 719 static void 720 rej_line(int ch, LINENUM i) 721 { 722 size_t len; 723 const char *line = pfetch(i); 724 725 len = strlen(line); 726 727 fprintf(rejfp, "%c%s", ch, line); 728 if (len == 0 || line[len-1] != '\n') 729 fprintf(rejfp, "\n\\ No newline at end of file\n"); 730 } 731 732 static void 733 abort_hunk(void) 734 { 735 LINENUM i, j, split; 736 int ch1, ch2; 737 const LINENUM pat_end = pch_end(); 738 const LINENUM oldfirst = pch_first() + last_offset; 739 const LINENUM newfirst = pch_newfirst() + last_offset; 740 741 if (diff_type != UNI_DIFF) { 742 abort_context_hunk(); 743 return; 744 } 745 split = -1; 746 for (i = 0; i <= pat_end; i++) { 747 if (pch_char(i) == '=') { 748 split = i; 749 break; 750 } 751 } 752 if (split == -1) { 753 fprintf(rejfp, "malformed hunk: no split found\n"); 754 return; 755 } 756 i = 0; 757 j = split + 1; 758 fprintf(rejfp, "@@ -%ld,%ld +%ld,%ld @@\n", 759 pch_ptrn_lines() ? oldfirst : 0, 760 pch_ptrn_lines(), newfirst, pch_repl_lines()); 761 while (i < split || j <= pat_end) { 762 ch1 = i < split ? pch_char(i) : -1; 763 ch2 = j <= pat_end ? pch_char(j) : -1; 764 if (ch1 == '-') { 765 rej_line('-', i); 766 i++; 767 } else if (ch1 == ' ' && ch2 == ' ') { 768 rej_line(' ', i); 769 i++; 770 j++; 771 } else if (ch1 == '!' && ch2 == '!') { 772 while (i < split && ch1 == '!') { 773 rej_line('-', i); 774 i++; 775 ch1 = i < split ? pch_char(i) : -1; 776 } 777 while (j <= pat_end && ch2 == '!') { 778 rej_line('+', j); 779 j++; 780 ch2 = j <= pat_end ? pch_char(j) : -1; 781 } 782 } else if (ch1 == '*') { 783 i++; 784 } else if (ch2 == '+' || ch2 == ' ') { 785 rej_line(ch2, j); 786 j++; 787 } else { 788 fprintf(rejfp, "internal error on (%ld %ld %ld)\n", 789 i, split, j); 790 rej_line(ch1, i); 791 rej_line(ch2, j); 792 return; 793 } 794 } 795 } 796 797 /* We found where to apply it (we hope), so do it. */ 798 799 static void 800 apply_hunk(LINENUM where) 801 { 802 LINENUM old = 1; 803 const LINENUM lastline = pch_ptrn_lines(); 804 LINENUM new = lastline + 1; 805 #define OUTSIDE 0 806 #define IN_IFNDEF 1 807 #define IN_IFDEF 2 808 #define IN_ELSE 3 809 int def_state = OUTSIDE; 810 const LINENUM pat_end = pch_end(); 811 812 where--; 813 while (pch_char(new) == '=' || pch_char(new) == '\n') 814 new++; 815 816 while (old <= lastline) { 817 if (pch_char(old) == '-') { 818 copy_till(where + old - 1, false); 819 if (do_defines) { 820 if (def_state == OUTSIDE) { 821 fputs(not_defined, ofp); 822 def_state = IN_IFNDEF; 823 } else if (def_state == IN_IFDEF) { 824 fputs(else_defined, ofp); 825 def_state = IN_ELSE; 826 } 827 fputs(pfetch(old), ofp); 828 } 829 last_frozen_line++; 830 old++; 831 } else if (new > pat_end) { 832 break; 833 } else if (pch_char(new) == '+') { 834 copy_till(where + old - 1, false); 835 if (do_defines) { 836 if (def_state == IN_IFNDEF) { 837 fputs(else_defined, ofp); 838 def_state = IN_ELSE; 839 } else if (def_state == OUTSIDE) { 840 fputs(if_defined, ofp); 841 def_state = IN_IFDEF; 842 } 843 } 844 fputs(pfetch(new), ofp); 845 new++; 846 } else if (pch_char(new) != pch_char(old)) { 847 say("Out-of-sync patch, lines %ld,%ld--mangled text or line numbers, maybe?\n", 848 pch_hunk_beg() + old, 849 pch_hunk_beg() + new); 850 #ifdef DEBUGGING 851 say("oldchar = '%c', newchar = '%c'\n", 852 pch_char(old), pch_char(new)); 853 #endif 854 my_exit(2); 855 } else if (pch_char(new) == '!') { 856 copy_till(where + old - 1, false); 857 if (do_defines) { 858 fputs(not_defined, ofp); 859 def_state = IN_IFNDEF; 860 } 861 while (pch_char(old) == '!') { 862 if (do_defines) { 863 fputs(pfetch(old), ofp); 864 } 865 last_frozen_line++; 866 old++; 867 } 868 if (do_defines) { 869 fputs(else_defined, ofp); 870 def_state = IN_ELSE; 871 } 872 while (pch_char(new) == '!') { 873 fputs(pfetch(new), ofp); 874 new++; 875 } 876 } else { 877 if (pch_char(new) != ' ') 878 fatal("Internal error: expected ' '\n"); 879 old++; 880 new++; 881 if (do_defines && def_state != OUTSIDE) { 882 fputs(end_defined, ofp); 883 def_state = OUTSIDE; 884 } 885 } 886 } 887 if (new <= pat_end && pch_char(new) == '+') { 888 copy_till(where + old - 1, false); 889 if (do_defines) { 890 if (def_state == OUTSIDE) { 891 fputs(if_defined, ofp); 892 def_state = IN_IFDEF; 893 } else if (def_state == IN_IFNDEF) { 894 fputs(else_defined, ofp); 895 def_state = IN_ELSE; 896 } 897 } 898 while (new <= pat_end && pch_char(new) == '+') { 899 fputs(pfetch(new), ofp); 900 new++; 901 } 902 } 903 if (do_defines && def_state != OUTSIDE) { 904 fputs(end_defined, ofp); 905 } 906 } 907 908 /* 909 * Open the new file. 910 */ 911 static void 912 init_output(const char *name) 913 { 914 ofp = fopen(name, "w"); 915 if (ofp == NULL) 916 pfatal("can't create %s", name); 917 } 918 919 /* 920 * Open a file to put hunks we can't locate. 921 */ 922 static void 923 init_reject(const char *name) 924 { 925 rejfp = fopen(name, "w"); 926 if (rejfp == NULL) 927 pfatal("can't create %s", name); 928 } 929 930 /* 931 * Copy input file to output, up to wherever hunk is to be applied. 932 * If endoffile is true, treat the last line specially since it may 933 * lack a newline. 934 */ 935 static void 936 copy_till(LINENUM lastline, bool endoffile) 937 { 938 if (last_frozen_line > lastline) 939 fatal("misordered hunks! output would be garbled\n"); 940 while (last_frozen_line < lastline) { 941 if (++last_frozen_line == lastline && endoffile) 942 dump_line(last_frozen_line, !last_line_missing_eol); 943 else 944 dump_line(last_frozen_line, true); 945 } 946 } 947 948 /* 949 * Finish copying the input file to the output file. 950 */ 951 static void 952 spew_output(void) 953 { 954 #ifdef DEBUGGING 955 if (debug & 256) 956 say("il=%ld lfl=%ld\n", input_lines, last_frozen_line); 957 #endif 958 if (input_lines) 959 copy_till(input_lines, true); /* dump remainder of file */ 960 fclose(ofp); 961 ofp = NULL; 962 } 963 964 /* 965 * Copy one line from input to output. 966 */ 967 static void 968 dump_line(LINENUM line, bool write_newline) 969 { 970 char *s; 971 972 s = ifetch(line, 0); 973 if (s == NULL) 974 return; 975 /* Note: string is not NUL terminated. */ 976 for (; *s != '\n'; s++) 977 putc(*s, ofp); 978 if (write_newline) 979 putc('\n', ofp); 980 } 981 982 /* 983 * Does the patch pattern match at line base+offset? 984 */ 985 static bool 986 patch_match(LINENUM base, LINENUM offset, LINENUM fuzz) 987 { 988 LINENUM pline = 1 + fuzz; 989 LINENUM iline; 990 LINENUM pat_lines = pch_ptrn_lines() - fuzz; 991 const char *ilineptr; 992 const char *plineptr; 993 short plinelen; 994 995 for (iline = base + offset + fuzz; pline <= pat_lines; pline++, iline++) { 996 ilineptr = ifetch(iline, offset >= 0); 997 if (ilineptr == NULL) 998 return false; 999 plineptr = pfetch(pline); 1000 plinelen = pch_line_len(pline); 1001 if (canonicalize) { 1002 if (!similar(ilineptr, plineptr, plinelen)) 1003 return false; 1004 } else if (strnNE(ilineptr, plineptr, plinelen)) 1005 return false; 1006 if (iline == input_lines) { 1007 /* 1008 * We are looking at the last line of the file. 1009 * If the file has no eol, the patch line should 1010 * not have one either and vice-versa. Note that 1011 * plinelen > 0. 1012 */ 1013 if (last_line_missing_eol) { 1014 if (plineptr[plinelen - 1] == '\n') 1015 return false; 1016 } else { 1017 if (plineptr[plinelen - 1] != '\n') 1018 return false; 1019 } 1020 } 1021 } 1022 return true; 1023 } 1024 1025 /* 1026 * Do two lines match with canonicalized white space? 1027 */ 1028 static bool 1029 similar(const char *a, const char *b, int len) 1030 { 1031 while (len) { 1032 if (isspace((unsigned char)*b)) { /* whitespace (or \n) to match? */ 1033 if (!isspace((unsigned char)*a)) /* no corresponding whitespace? */ 1034 return false; 1035 while (len && isspace((unsigned char)*b) && *b != '\n') 1036 b++, len--; /* skip pattern whitespace */ 1037 while (isspace((unsigned char)*a) && *a != '\n') 1038 a++; /* skip target whitespace */ 1039 if (*a == '\n' || *b == '\n') 1040 return (*a == *b); /* should end in sync */ 1041 } else if (*a++ != *b++) /* match non-whitespace chars */ 1042 return false; 1043 else 1044 len--; /* probably not necessary */ 1045 } 1046 return true; /* actually, this is not reached */ 1047 /* since there is always a \n */ 1048 } 1049