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 * $NetBSD: patch.c,v 1.32 2021/05/25 11:25:59 cjep Exp $ 5 */ 6 7 /* 8 * patch - a program to apply diffs to original files 9 * 10 * Copyright 1986, Larry Wall 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following condition is met: 14 * 1. Redistributions of source code must retain the above copyright notice, 15 * this condition and the following disclaimer. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY 18 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 19 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 20 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR 21 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 23 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 24 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * -C option added in 1998, original code by Marc Espie, based on FreeBSD 30 * behaviour 31 */ 32 33 #include <sys/cdefs.h> 34 __RCSID("$NetBSD: patch.c,v 1.32 2021/05/25 11:25:59 cjep Exp $"); 35 36 #include <sys/types.h> 37 #include <sys/stat.h> 38 39 #include <ctype.h> 40 #include <getopt.h> 41 #include <limits.h> 42 #include <stdio.h> 43 #include <string.h> 44 #include <stdlib.h> 45 #include <unistd.h> 46 47 #include "common.h" 48 #include "util.h" 49 #include "pch.h" 50 #include "inp.h" 51 #include "backupfile.h" 52 #include "pathnames.h" 53 54 mode_t filemode = 0644; 55 56 char *buf; /* general purpose buffer */ 57 size_t bufsz; /* general purpose buffer size */ 58 59 bool using_plan_a = true; /* try to keep everything in memory */ 60 bool out_of_mem = false; /* ran out of memory in plan a */ 61 62 #define MAXFILEC 2 63 64 char *filearg[MAXFILEC]; 65 bool ok_to_create_file = false; 66 char *outname = NULL; 67 char *origprae = NULL; 68 char *TMPOUTNAME; 69 char *TMPINNAME; 70 char *TMPREJNAME; 71 char *TMPPATNAME; 72 bool toutkeep = false; 73 bool trejkeep = false; 74 bool warn_on_invalid_line; 75 bool last_line_missing_eol; 76 77 #ifdef DEBUGGING 78 int debug = 0; 79 #endif 80 81 bool force = false; 82 bool batch = false; 83 bool verbose = true; 84 bool reverse = false; 85 bool noreverse = false; 86 bool skip_rest_of_patch = false; 87 int strippath = 957; 88 bool canonicalize = false; 89 bool check_only = false; 90 int diff_type = 0; 91 char *revision = NULL; /* prerequisite revision, if any */ 92 LINENUM input_lines = 0; /* how long is input file in lines */ 93 int posix = 0; /* strict POSIX mode? */ 94 95 static void reinitialize_almost_everything(void); 96 static void get_some_switches(void); 97 static LINENUM locate_hunk(LINENUM); 98 static void abort_context_hunk(void); 99 static void rej_line(int, LINENUM); 100 static void abort_hunk(void); 101 static void apply_hunk(LINENUM); 102 static void init_output(const char *); 103 static void init_reject(const char *); 104 static void copy_till(LINENUM, bool); 105 static bool spew_output(void); 106 static void dump_line(LINENUM, bool); 107 static bool patch_match(LINENUM, LINENUM, LINENUM); 108 static bool similar(const char *, const char *, int); 109 __dead static void usage(void); 110 111 /* true if -E was specified on command line. */ 112 static bool remove_empty_files = false; 113 114 /* true if -R was specified on command line. */ 115 static bool reverse_flag_specified = false; 116 117 /* buffer holding the name of the rejected patch file. */ 118 static char rejname[PATH_MAX]; 119 120 /* buffer for stderr */ 121 static char serrbuf[BUFSIZ]; 122 123 /* how many input lines have been irretractibly output */ 124 static LINENUM last_frozen_line = 0; 125 126 static int Argc; /* guess */ 127 static char **Argv; 128 static int Argc_last; /* for restarting plan_b */ 129 static char **Argv_last; 130 131 static FILE *ofp = NULL; /* output file pointer */ 132 static FILE *rejfp = NULL; /* reject file pointer */ 133 134 static int filec = 0; /* how many file arguments? */ 135 static LINENUM last_offset = 0; 136 static LINENUM maxfuzz = 2; 137 138 /* patch using ifdef, ifndef, etc. */ 139 static bool do_defines = false; 140 /* #ifdef xyzzy */ 141 static char if_defined[128]; 142 /* #ifndef xyzzy */ 143 static char not_defined[128]; 144 /* #else */ 145 static const char else_defined[] = "#else\n"; 146 /* #endif xyzzy */ 147 static char end_defined[128]; 148 149 150 /* Apply a set of diffs as appropriate. */ 151 152 int 153 main(int argc, char *argv[]) 154 { 155 int error = 0, hunk, failed, i, fd; 156 LINENUM where = 0, newwhere, fuzz, mymaxfuzz; 157 const char *tmpdir; 158 char *v; 159 160 bufsz = INITLINELEN; 161 if ((buf = malloc(bufsz)) == NULL) 162 pfatal("allocating input buffer"); 163 buf[0] = '\0'; 164 165 setbuf(stderr, serrbuf); 166 for (i = 0; i < MAXFILEC; i++) 167 filearg[i] = NULL; 168 169 /* Cons up the names of the temporary files. */ 170 if ((tmpdir = getenv("TMPDIR")) == NULL || *tmpdir == '\0') 171 tmpdir = _PATH_TMP; 172 for (i = strlen(tmpdir) - 1; i > 0 && tmpdir[i] == '/'; i--) 173 ; 174 i++; 175 if (asprintf(&TMPOUTNAME, "%.*s/patchoXXXXXXXXXX", i, tmpdir) == -1) 176 fatal("cannot allocate memory"); 177 if ((fd = mkstemp(TMPOUTNAME)) < 0) 178 pfatal("can't create %s", TMPOUTNAME); 179 close(fd); 180 181 if (asprintf(&TMPINNAME, "%.*s/patchiXXXXXXXXXX", i, tmpdir) == -1) 182 fatal("cannot allocate memory"); 183 if ((fd = mkstemp(TMPINNAME)) < 0) 184 pfatal("can't create %s", TMPINNAME); 185 close(fd); 186 187 if (asprintf(&TMPREJNAME, "%.*s/patchrXXXXXXXXXX", i, tmpdir) == -1) 188 fatal("cannot allocate memory"); 189 if ((fd = mkstemp(TMPREJNAME)) < 0) 190 pfatal("can't create %s", TMPREJNAME); 191 close(fd); 192 193 if (asprintf(&TMPPATNAME, "%.*s/patchpXXXXXXXXXX", i, tmpdir) == -1) 194 fatal("cannot allocate memory"); 195 if ((fd = mkstemp(TMPPATNAME)) < 0) 196 pfatal("can't create %s", TMPPATNAME); 197 close(fd); 198 199 v = getenv("SIMPLE_BACKUP_SUFFIX"); 200 if (v) 201 simple_backup_suffix = v; 202 else 203 simple_backup_suffix = ORIGEXT; 204 205 if ((v = getenv("PATCH_VERSION_CONTROL")) == NULL) 206 v = getenv("VERSION_CONTROL"); 207 if (v != NULL) 208 backup_type = get_version(v); 209 210 /* parse switches */ 211 Argc = argc; 212 Argv = argv; 213 get_some_switches(); 214 215 if (backup_type == undefined) 216 backup_type = posix ? none : numbered_existing; 217 218 /* make sure we clean up /tmp in case of disaster */ 219 set_signals(0); 220 221 for (open_patch_file(filearg[1]); there_is_another_patch(); 222 reinitialize_almost_everything()) { 223 /* for each patch in patch file */ 224 225 warn_on_invalid_line = true; 226 227 if (outname == NULL) 228 outname = savestr(filearg[0]); 229 230 /* for ed script just up and do it and exit */ 231 if (diff_type == ED_DIFF) { 232 do_ed_script(); 233 continue; 234 } 235 /* initialize the patched file */ 236 if (!skip_rest_of_patch) 237 init_output(TMPOUTNAME); 238 239 /* initialize reject file */ 240 init_reject(TMPREJNAME); 241 242 /* find out where all the lines are */ 243 if (!skip_rest_of_patch) 244 scan_input(filearg[0]); 245 246 /* from here on, open no standard i/o files, because malloc */ 247 /* might misfire and we can't catch it easily */ 248 249 /* apply each hunk of patch */ 250 hunk = 0; 251 failed = 0; 252 out_of_mem = false; 253 while (another_hunk()) { 254 hunk++; 255 fuzz = 0; 256 mymaxfuzz = pch_context(); 257 if (maxfuzz < mymaxfuzz) 258 mymaxfuzz = maxfuzz; 259 if (!skip_rest_of_patch) { 260 do { 261 where = locate_hunk(fuzz); 262 if (hunk == 1 && where == 0 && !force) { 263 /* dwim for reversed patch? */ 264 if (!pch_swap()) { 265 if (fuzz == 0) 266 say("Not enough memory to try swapped hunk! Assuming unswapped.\n"); 267 continue; 268 } 269 reverse = !reverse; 270 /* try again */ 271 where = locate_hunk(fuzz); 272 if (where == 0) { 273 /* didn't find it swapped */ 274 if (!pch_swap()) 275 /* put it back to normal */ 276 fatal("lost hunk on alloc error!\n"); 277 reverse = !reverse; 278 } else if (noreverse) { 279 if (!pch_swap()) 280 /* put it back to normal */ 281 fatal("lost hunk on alloc error!\n"); 282 reverse = !reverse; 283 say("Ignoring previously applied (or reversed) patch.\n"); 284 skip_rest_of_patch = true; 285 } else if (batch) { 286 if (verbose) 287 say("%seversed (or previously applied) patch detected! %s -R.", 288 reverse ? "R" : "Unr", 289 reverse ? "Assuming" : "Ignoring"); 290 } else { 291 ask("%seversed (or previously applied) patch detected! %s -R? [y] ", 292 reverse ? "R" : "Unr", 293 reverse ? "Assume" : "Ignore"); 294 if (*buf == 'n') { 295 ask("Apply anyway? [n] "); 296 if (*buf != 'y') 297 skip_rest_of_patch = true; 298 where = 0; 299 reverse = !reverse; 300 if (!pch_swap()) 301 /* put it back to normal */ 302 fatal("lost hunk on alloc error!\n"); 303 } 304 } 305 } 306 } while (!skip_rest_of_patch && where == 0 && 307 ++fuzz <= mymaxfuzz); 308 309 if (skip_rest_of_patch) { /* just got decided */ 310 if (ferror(ofp) || fclose(ofp)) { 311 say("Error writing %s\n", 312 TMPOUTNAME); 313 error = 1; 314 } 315 ofp = NULL; 316 } 317 } 318 newwhere = pch_newfirst() + last_offset; 319 if (skip_rest_of_patch) { 320 abort_hunk(); 321 failed++; 322 if (verbose) 323 say("Hunk #%d ignored at %ld.\n", 324 hunk, newwhere); 325 } else if (where == 0) { 326 abort_hunk(); 327 failed++; 328 if (verbose) 329 say("Hunk #%d failed at %ld.\n", 330 hunk, newwhere); 331 } else { 332 apply_hunk(where); 333 if (verbose) { 334 say("Hunk #%d succeeded at %ld", 335 hunk, newwhere); 336 if (fuzz != 0) 337 say(" with fuzz %ld", fuzz); 338 if (last_offset) 339 say(" (offset %ld line%s)", 340 last_offset, 341 last_offset == 1L ? "" : "s"); 342 say(".\n"); 343 } 344 } 345 } 346 347 if (out_of_mem && using_plan_a) { 348 Argc = Argc_last; 349 Argv = Argv_last; 350 say("\n\nRan out of memory using Plan A--trying again...\n\n"); 351 if (ofp) 352 fclose(ofp); 353 ofp = NULL; 354 if (rejfp) 355 fclose(rejfp); 356 rejfp = NULL; 357 continue; 358 } 359 if (hunk == 0) 360 fatal("Internal error: hunk should not be 0\n"); 361 362 /* finish spewing out the new file */ 363 if (!skip_rest_of_patch && !spew_output()) { 364 say("Can't write %s\n", TMPOUTNAME); 365 error = 1; 366 } 367 368 /* and put the output where desired */ 369 ignore_signals(); 370 if (!skip_rest_of_patch) { 371 struct stat statbuf; 372 char *realout = outname; 373 374 if (!check_only) { 375 if (move_file(TMPOUTNAME, outname) < 0) { 376 toutkeep = true; 377 realout = TMPOUTNAME; 378 chmod(TMPOUTNAME, filemode); 379 } else 380 chmod(outname, filemode); 381 382 if (remove_empty_files && 383 stat(realout, &statbuf) == 0 && 384 statbuf.st_size == 0) { 385 if (verbose) 386 say("Removing %s (empty after patching).\n", 387 realout); 388 unlink(realout); 389 } 390 } 391 } 392 if (ferror(rejfp) || fclose(rejfp)) { 393 say("Error writing %s\n", rejname); 394 error = 1; 395 } 396 rejfp = NULL; 397 if (failed) { 398 error = 1; 399 if (*rejname == '\0') { 400 if (strlcpy(rejname, outname, 401 sizeof(rejname)) >= sizeof(rejname)) 402 fatal("filename %s is too long\n", outname); 403 if (strlcat(rejname, REJEXT, 404 sizeof(rejname)) >= sizeof(rejname)) 405 fatal("filename %s is too long\n", outname); 406 } 407 if (skip_rest_of_patch) { 408 say("%d out of %d hunks ignored--saving rejects to %s\n", 409 failed, hunk, rejname); 410 } else { 411 say("%d out of %d hunks failed--saving rejects to %s\n", 412 failed, hunk, rejname); 413 } 414 if (!check_only && move_file(TMPREJNAME, rejname) < 0) 415 trejkeep = true; 416 } 417 set_signals(1); 418 } 419 my_exit(error); 420 /* NOTREACHED */ 421 } 422 423 /* Prepare to find the next patch to do in the patch file. */ 424 425 static void 426 reinitialize_almost_everything(void) 427 { 428 re_patch(); 429 re_input(); 430 431 input_lines = 0; 432 last_frozen_line = 0; 433 434 filec = 0; 435 if (!out_of_mem) { 436 free(filearg[0]); 437 filearg[0] = NULL; 438 } 439 440 free(outname); 441 outname = NULL; 442 443 last_offset = 0; 444 diff_type = 0; 445 446 free(revision); 447 revision = NULL; 448 449 reverse = reverse_flag_specified; 450 skip_rest_of_patch = false; 451 452 get_some_switches(); 453 } 454 455 /* Process switches and filenames. */ 456 457 static void 458 get_some_switches(void) 459 { 460 const char *options = "b::B:cCd:D:eEfF:i:lnNo:p:r:RstuvV:x:z:"; 461 static struct option longopts[] = { 462 {"backup", no_argument, 0, 'b'}, 463 {"batch", no_argument, 0, 't'}, 464 {"check", no_argument, 0, 'C'}, 465 {"context", no_argument, 0, 'c'}, 466 {"debug", required_argument, 0, 'x'}, 467 {"directory", required_argument, 0, 'd'}, 468 {"ed", no_argument, 0, 'e'}, 469 {"force", no_argument, 0, 'f'}, 470 {"forward", no_argument, 0, 'N'}, 471 {"fuzz", required_argument, 0, 'F'}, 472 {"ifdef", required_argument, 0, 'D'}, 473 {"input", required_argument, 0, 'i'}, 474 {"ignore-whitespace", no_argument, 0, 'l'}, 475 {"normal", no_argument, 0, 'n'}, 476 {"output", required_argument, 0, 'o'}, 477 {"prefix", required_argument, 0, 'B'}, 478 {"quiet", no_argument, 0, 's'}, 479 {"reject-file", required_argument, 0, 'r'}, 480 {"remove-empty-files", no_argument, 0, 'E'}, 481 {"reverse", no_argument, 0, 'R'}, 482 {"silent", no_argument, 0, 's'}, 483 {"strip", required_argument, 0, 'p'}, 484 {"suffix", required_argument, 0, 'z'}, 485 {"unified", no_argument, 0, 'u'}, 486 {"version", no_argument, 0, 'v'}, 487 {"version-control", required_argument, 0, 'V'}, 488 {"posix", no_argument, &posix, 1}, 489 {NULL, 0, 0, 0} 490 }; 491 int ch; 492 493 rejname[0] = '\0'; 494 Argc_last = Argc; 495 Argv_last = Argv; 496 if (!Argc) 497 return; 498 optreset = optind = 1; 499 while ((ch = getopt_long(Argc, Argv, options, longopts, NULL)) != -1) { 500 switch (ch) { 501 case 'b': 502 if (backup_type == undefined) 503 backup_type = numbered_existing; 504 if (optarg == NULL) 505 break; 506 if (verbose) 507 say("Warning, the ``-b suffix'' option has been" 508 " obsoleted by the -z option.\n"); 509 /* FALLTHROUGH */ 510 case 'z': 511 /* must directly follow 'b' case for backwards compat */ 512 simple_backup_suffix = savestr(optarg); 513 break; 514 case 'B': 515 origprae = savestr(optarg); 516 break; 517 case 'c': 518 diff_type = CONTEXT_DIFF; 519 break; 520 case 'C': 521 check_only = true; 522 break; 523 case 'd': 524 if (chdir(optarg) < 0) 525 pfatal("can't cd to %s", optarg); 526 break; 527 case 'D': 528 do_defines = true; 529 if (!isalpha((unsigned char)*optarg) && *optarg != '_') 530 fatal("argument to -D is not an identifier\n"); 531 snprintf(if_defined, sizeof if_defined, 532 "#ifdef %s\n", optarg); 533 snprintf(not_defined, sizeof not_defined, 534 "#ifndef %s\n", optarg); 535 snprintf(end_defined, sizeof end_defined, 536 "#endif /* %s */\n", optarg); 537 break; 538 case 'e': 539 diff_type = ED_DIFF; 540 break; 541 case 'E': 542 remove_empty_files = true; 543 break; 544 case 'f': 545 force = true; 546 break; 547 case 'F': 548 maxfuzz = atoi(optarg); 549 break; 550 case 'i': 551 if (++filec == MAXFILEC) 552 fatal("too many file arguments\n"); 553 filearg[filec] = savestr(optarg); 554 break; 555 case 'l': 556 canonicalize = true; 557 break; 558 case 'n': 559 diff_type = NORMAL_DIFF; 560 break; 561 case 'N': 562 noreverse = true; 563 break; 564 case 'o': 565 outname = savestr(optarg); 566 break; 567 case 'p': 568 strippath = atoi(optarg); 569 break; 570 case 'r': 571 if (strlcpy(rejname, optarg, 572 sizeof(rejname)) >= sizeof(rejname)) 573 fatal("argument for -r is too long\n"); 574 break; 575 case 'R': 576 reverse = true; 577 reverse_flag_specified = true; 578 break; 579 case 's': 580 verbose = false; 581 break; 582 case 't': 583 batch = true; 584 break; 585 case 'u': 586 diff_type = UNI_DIFF; 587 break; 588 case 'v': 589 version(); 590 break; 591 case 'V': 592 backup_type = get_version(optarg); 593 break; 594 #ifdef DEBUGGING 595 case 'x': 596 debug = atoi(optarg); 597 break; 598 #endif 599 default: 600 if (ch != '\0') 601 usage(); 602 break; 603 } 604 } 605 Argc -= optind; 606 Argv += optind; 607 608 if (Argc > 0) { 609 filearg[0] = savestr(*Argv++); 610 Argc--; 611 while (Argc > 0) { 612 if (++filec == MAXFILEC) 613 fatal("too many file arguments\n"); 614 filearg[filec] = savestr(*Argv++); 615 Argc--; 616 } 617 } 618 619 if (getenv("POSIXLY_CORRECT") != NULL) 620 posix = 1; 621 } 622 623 static void 624 usage(void) 625 { 626 fprintf(stderr, 627 "usage: patch [-bCcEeflNnRstuv] [-B backup-prefix] [-D symbol] [-d directory]\n" 628 " [-F max-fuzz] [-i patchfile] [-o out-file] [-p strip-count]\n" 629 " [-r rej-name] [-V t | nil | never] [-x number] [-z backup-ext]\n" 630 " [--posix] [origfile [patchfile]]\n" 631 " patch <patchfile\n"); 632 my_exit(EXIT_FAILURE); 633 } 634 635 /* 636 * Attempt to find the right place to apply this hunk of patch. 637 */ 638 static LINENUM 639 locate_hunk(LINENUM fuzz) 640 { 641 LINENUM first_guess = pch_first() + last_offset; 642 LINENUM offset; 643 LINENUM pat_lines = pch_ptrn_lines(); 644 LINENUM max_pos_offset = input_lines - first_guess - pat_lines + 1; 645 LINENUM max_neg_offset = first_guess - last_frozen_line - 1 + pch_context(); 646 647 if (pat_lines == 0) { /* null range matches always */ 648 if (verbose && fuzz == 0 && (diff_type == CONTEXT_DIFF 649 || diff_type == NEW_CONTEXT_DIFF 650 || diff_type == UNI_DIFF)) { 651 say("Empty context always matches.\n"); 652 } 653 return (first_guess); 654 } 655 if (max_neg_offset >= first_guess) /* do not try lines < 0 */ 656 max_neg_offset = first_guess - 1; 657 if (first_guess <= input_lines && patch_match(first_guess, 0, fuzz)) 658 return first_guess; 659 for (offset = 1; ; offset++) { 660 bool check_after = (offset <= max_pos_offset); 661 bool check_before = (offset <= max_neg_offset); 662 663 if (check_after && patch_match(first_guess, offset, fuzz)) { 664 #ifdef DEBUGGING 665 if (debug & 1) 666 say("Offset changing from %ld to %ld\n", 667 last_offset, offset); 668 #endif 669 last_offset = offset; 670 return first_guess + offset; 671 } else if (check_before && patch_match(first_guess, -offset, fuzz)) { 672 #ifdef DEBUGGING 673 if (debug & 1) 674 say("Offset changing from %ld to %ld\n", 675 last_offset, -offset); 676 #endif 677 last_offset = -offset; 678 return first_guess - offset; 679 } else if (!check_before && !check_after) 680 return 0; 681 } 682 } 683 684 /* We did not find the pattern, dump out the hunk so they can handle it. */ 685 686 static void 687 abort_context_hunk(void) 688 { 689 LINENUM i; 690 const LINENUM pat_end = pch_end(); 691 /* 692 * add in last_offset to guess the same as the previous successful 693 * hunk 694 */ 695 const LINENUM oldfirst = pch_first() + last_offset; 696 const LINENUM newfirst = pch_newfirst() + last_offset; 697 const LINENUM oldlast = oldfirst + pch_ptrn_lines() - 1; 698 const LINENUM newlast = newfirst + pch_repl_lines() - 1; 699 const char *stars = (diff_type >= NEW_CONTEXT_DIFF ? " ****" : ""); 700 const char *minuses = (diff_type >= NEW_CONTEXT_DIFF ? " ----" : " -----"); 701 702 fprintf(rejfp, "***************\n"); 703 for (i = 0; i <= pat_end; i++) { 704 switch (pch_char(i)) { 705 case '*': 706 if (oldlast < oldfirst) 707 fprintf(rejfp, "*** 0%s\n", stars); 708 else if (oldlast == oldfirst) 709 fprintf(rejfp, "*** %ld%s\n", oldfirst, stars); 710 else 711 fprintf(rejfp, "*** %ld,%ld%s\n", oldfirst, 712 oldlast, stars); 713 break; 714 case '=': 715 if (newlast < newfirst) 716 fprintf(rejfp, "--- 0%s\n", minuses); 717 else if (newlast == newfirst) 718 fprintf(rejfp, "--- %ld%s\n", newfirst, minuses); 719 else 720 fprintf(rejfp, "--- %ld,%ld%s\n", newfirst, 721 newlast, minuses); 722 break; 723 case '\n': 724 fprintf(rejfp, "%s", pfetch(i)); 725 break; 726 case ' ': 727 case '-': 728 case '+': 729 case '!': 730 fprintf(rejfp, "%c %s", pch_char(i), pfetch(i)); 731 break; 732 default: 733 fatal("fatal internal error in abort_context_hunk\n"); 734 } 735 } 736 } 737 738 static void 739 rej_line(int ch, LINENUM i) 740 { 741 size_t len; 742 const char *line = pfetch(i); 743 744 len = strlen(line); 745 746 fprintf(rejfp, "%c%s", ch, line); 747 if (len == 0 || line[len-1] != '\n') 748 fprintf(rejfp, "\n\\ No newline at end of file\n"); 749 } 750 751 static void 752 abort_hunk(void) 753 { 754 LINENUM i, j, split; 755 int ch1, ch2; 756 const LINENUM pat_end = pch_end(); 757 const LINENUM oldfirst = pch_first() + last_offset; 758 const LINENUM newfirst = pch_newfirst() + last_offset; 759 760 if (diff_type != UNI_DIFF) { 761 abort_context_hunk(); 762 return; 763 } 764 split = -1; 765 for (i = 0; i <= pat_end; i++) { 766 if (pch_char(i) == '=') { 767 split = i; 768 break; 769 } 770 } 771 if (split == -1) { 772 fprintf(rejfp, "malformed hunk: no split found\n"); 773 return; 774 } 775 i = 0; 776 j = split + 1; 777 fprintf(rejfp, "@@ -%ld,%ld +%ld,%ld @@\n", 778 pch_ptrn_lines() ? oldfirst : 0, 779 pch_ptrn_lines(), newfirst, pch_repl_lines()); 780 while (i < split || j <= pat_end) { 781 ch1 = i < split ? pch_char(i) : -1; 782 ch2 = j <= pat_end ? pch_char(j) : -1; 783 if (ch1 == '-') { 784 rej_line('-', i); 785 i++; 786 } else if (ch1 == ' ' && ch2 == ' ') { 787 rej_line(' ', i); 788 i++; 789 j++; 790 } else if (ch1 == '!' && ch2 == '!') { 791 while (i < split && ch1 == '!') { 792 rej_line('-', i); 793 i++; 794 ch1 = i < split ? pch_char(i) : -1; 795 } 796 while (j <= pat_end && ch2 == '!') { 797 rej_line('+', j); 798 j++; 799 ch2 = j <= pat_end ? pch_char(j) : -1; 800 } 801 } else if (ch1 == '*') { 802 i++; 803 } else if (ch2 == '+' || ch2 == ' ') { 804 rej_line(ch2, j); 805 j++; 806 } else { 807 fprintf(rejfp, "internal error on (%ld %ld %ld)\n", 808 i, split, j); 809 rej_line(ch1, i); 810 rej_line(ch2, j); 811 return; 812 } 813 } 814 } 815 816 /* We found where to apply it (we hope), so do it. */ 817 818 static void 819 apply_hunk(LINENUM where) 820 { 821 LINENUM old = 1; 822 const LINENUM lastline = pch_ptrn_lines(); 823 LINENUM new = lastline + 1; 824 #define OUTSIDE 0 825 #define IN_IFNDEF 1 826 #define IN_IFDEF 2 827 #define IN_ELSE 3 828 int def_state = OUTSIDE; 829 const LINENUM pat_end = pch_end(); 830 831 where--; 832 while (pch_char(new) == '=' || pch_char(new) == '\n') 833 new++; 834 835 while (old <= lastline) { 836 if (pch_char(old) == '-') { 837 copy_till(where + old - 1, false); 838 if (do_defines) { 839 if (def_state == OUTSIDE) { 840 fputs(not_defined, ofp); 841 def_state = IN_IFNDEF; 842 } else if (def_state == IN_IFDEF) { 843 fputs(else_defined, ofp); 844 def_state = IN_ELSE; 845 } 846 fputs(pfetch(old), ofp); 847 } 848 last_frozen_line++; 849 old++; 850 } else if (new > pat_end) { 851 break; 852 } else if (pch_char(new) == '+') { 853 copy_till(where + old - 1, false); 854 if (do_defines) { 855 if (def_state == IN_IFNDEF) { 856 fputs(else_defined, ofp); 857 def_state = IN_ELSE; 858 } else if (def_state == OUTSIDE) { 859 fputs(if_defined, ofp); 860 def_state = IN_IFDEF; 861 } 862 } 863 fputs(pfetch(new), ofp); 864 new++; 865 } else if (pch_char(new) != pch_char(old)) { 866 say("Out-of-sync patch, lines %ld,%ld--mangled text or line numbers, maybe?\n", 867 pch_hunk_beg() + old, 868 pch_hunk_beg() + new); 869 #ifdef DEBUGGING 870 say("oldchar = '%c', newchar = '%c'\n", 871 pch_char(old), pch_char(new)); 872 #endif 873 my_exit(2); 874 } else if (pch_char(new) == '!') { 875 copy_till(where + old - 1, false); 876 if (do_defines) { 877 fputs(not_defined, ofp); 878 def_state = IN_IFNDEF; 879 } 880 while (pch_char(old) == '!') { 881 if (do_defines) { 882 fputs(pfetch(old), ofp); 883 } 884 last_frozen_line++; 885 old++; 886 } 887 if (do_defines) { 888 fputs(else_defined, ofp); 889 def_state = IN_ELSE; 890 } 891 while (pch_char(new) == '!') { 892 fputs(pfetch(new), ofp); 893 new++; 894 } 895 } else { 896 if (pch_char(new) != ' ') 897 fatal("Internal error: expected ' '\n"); 898 old++; 899 new++; 900 if (do_defines && def_state != OUTSIDE) { 901 fputs(end_defined, ofp); 902 def_state = OUTSIDE; 903 } 904 } 905 } 906 if (new <= pat_end && pch_char(new) == '+') { 907 copy_till(where + old - 1, false); 908 if (do_defines) { 909 if (def_state == OUTSIDE) { 910 fputs(if_defined, ofp); 911 def_state = IN_IFDEF; 912 } else if (def_state == IN_IFNDEF) { 913 fputs(else_defined, ofp); 914 def_state = IN_ELSE; 915 } 916 } 917 while (new <= pat_end && pch_char(new) == '+') { 918 fputs(pfetch(new), ofp); 919 new++; 920 } 921 } 922 if (do_defines && def_state != OUTSIDE) { 923 fputs(end_defined, ofp); 924 } 925 } 926 927 /* 928 * Open the new file. 929 */ 930 static void 931 init_output(const char *name) 932 { 933 ofp = fopen(name, "w"); 934 if (ofp == NULL) 935 pfatal("can't create %s", name); 936 } 937 938 /* 939 * Open a file to put hunks we can't locate. 940 */ 941 static void 942 init_reject(const char *name) 943 { 944 rejfp = fopen(name, "w"); 945 if (rejfp == NULL) 946 pfatal("can't create %s", name); 947 } 948 949 /* 950 * Copy input file to output, up to wherever hunk is to be applied. 951 * If endoffile is true, treat the last line specially since it may 952 * lack a newline. 953 */ 954 static void 955 copy_till(LINENUM lastline, bool endoffile) 956 { 957 if (last_frozen_line > lastline) 958 fatal("misordered hunks! output would be garbled\n"); 959 while (last_frozen_line < lastline) { 960 if (++last_frozen_line == lastline && endoffile) 961 dump_line(last_frozen_line, !last_line_missing_eol); 962 else 963 dump_line(last_frozen_line, true); 964 } 965 } 966 967 /* 968 * Finish copying the input file to the output file. 969 */ 970 static bool 971 spew_output(void) 972 { 973 int rv; 974 975 #ifdef DEBUGGING 976 if (debug & 256) 977 say("il=%ld lfl=%ld\n", input_lines, last_frozen_line); 978 #endif 979 if (input_lines) 980 copy_till(input_lines, true); /* dump remainder of file */ 981 rv = ferror(ofp) == 0 && fclose(ofp) == 0; 982 ofp = NULL; 983 return rv; 984 } 985 986 /* 987 * Copy one line from input to output. 988 */ 989 static void 990 dump_line(LINENUM line, bool write_newline) 991 { 992 char *s; 993 994 s = ifetch(line, 0); 995 if (s == NULL) 996 return; 997 /* Note: string is not NUL terminated. */ 998 for (; *s != '\n'; s++) 999 putc(*s, ofp); 1000 if (write_newline) 1001 putc('\n', ofp); 1002 } 1003 1004 /* 1005 * Does the patch pattern match at line base+offset? 1006 */ 1007 static bool 1008 patch_match(LINENUM base, LINENUM offset, LINENUM fuzz) 1009 { 1010 LINENUM pline = 1 + fuzz; 1011 LINENUM iline; 1012 LINENUM pat_lines = pch_ptrn_lines() - fuzz; 1013 const char *ilineptr; 1014 const char *plineptr; 1015 short plinelen; 1016 1017 for (iline = base + offset + fuzz; pline <= pat_lines; pline++, iline++) { 1018 ilineptr = ifetch(iline, offset >= 0); 1019 if (ilineptr == NULL) 1020 return false; 1021 plineptr = pfetch(pline); 1022 plinelen = pch_line_len(pline); 1023 if (canonicalize) { 1024 if (!similar(ilineptr, plineptr, plinelen)) 1025 return false; 1026 } else if (strnNE(ilineptr, plineptr, plinelen)) 1027 return false; 1028 if (iline == input_lines) { 1029 /* 1030 * We are looking at the last line of the file. 1031 * If the file has no eol, the patch line should 1032 * not have one either and vice-versa. Note that 1033 * plinelen > 0. 1034 */ 1035 if (last_line_missing_eol) { 1036 if (plineptr[plinelen - 1] == '\n') 1037 return false; 1038 } else { 1039 if (plineptr[plinelen - 1] != '\n') 1040 return false; 1041 } 1042 } 1043 } 1044 return true; 1045 } 1046 1047 /* 1048 * Do two lines match with canonicalized white space? 1049 */ 1050 static bool 1051 similar(const char *a, const char *b, int len) 1052 { 1053 while (len) { 1054 if (isspace((unsigned char)*b)) { /* whitespace (or \n) to match? */ 1055 if (!isspace((unsigned char)*a)) /* no corresponding whitespace? */ 1056 return false; 1057 while (len && isspace((unsigned char)*b) && *b != '\n') 1058 b++, len--; /* skip pattern whitespace */ 1059 while (isspace((unsigned char)*a) && *a != '\n') 1060 a++; /* skip target whitespace */ 1061 if (*a == '\n' || *b == '\n') 1062 return (*a == *b); /* should end in sync */ 1063 } else if (*a++ != *b++) /* match non-whitespace chars */ 1064 return false; 1065 else 1066 len--; /* probably not necessary */ 1067 } 1068 return true; /* actually, this is not reached */ 1069 /* since there is always a \n */ 1070 } 1071