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 1.31 2021/02/20 09:17:13 nia 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 1.31 2021/02/20 09:17:13 nia 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[MAXLINELEN]; /* general purpose buffer */ 57 size_t buf_len = sizeof(buf); 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 setbuf(stderr, serrbuf); 161 for (i = 0; i < MAXFILEC; i++) 162 filearg[i] = NULL; 163 164 /* Cons up the names of the temporary files. */ 165 if ((tmpdir = getenv("TMPDIR")) == NULL || *tmpdir == '\0') 166 tmpdir = _PATH_TMP; 167 for (i = strlen(tmpdir) - 1; i > 0 && tmpdir[i] == '/'; i--) 168 ; 169 i++; 170 if (asprintf(&TMPOUTNAME, "%.*s/patchoXXXXXXXXXX", i, tmpdir) == -1) 171 fatal("cannot allocate memory"); 172 if ((fd = mkstemp(TMPOUTNAME)) < 0) 173 pfatal("can't create %s", TMPOUTNAME); 174 close(fd); 175 176 if (asprintf(&TMPINNAME, "%.*s/patchiXXXXXXXXXX", i, tmpdir) == -1) 177 fatal("cannot allocate memory"); 178 if ((fd = mkstemp(TMPINNAME)) < 0) 179 pfatal("can't create %s", TMPINNAME); 180 close(fd); 181 182 if (asprintf(&TMPREJNAME, "%.*s/patchrXXXXXXXXXX", i, tmpdir) == -1) 183 fatal("cannot allocate memory"); 184 if ((fd = mkstemp(TMPREJNAME)) < 0) 185 pfatal("can't create %s", TMPREJNAME); 186 close(fd); 187 188 if (asprintf(&TMPPATNAME, "%.*s/patchpXXXXXXXXXX", i, tmpdir) == -1) 189 fatal("cannot allocate memory"); 190 if ((fd = mkstemp(TMPPATNAME)) < 0) 191 pfatal("can't create %s", TMPPATNAME); 192 close(fd); 193 194 v = getenv("SIMPLE_BACKUP_SUFFIX"); 195 if (v) 196 simple_backup_suffix = v; 197 else 198 simple_backup_suffix = ORIGEXT; 199 200 if ((v = getenv("PATCH_VERSION_CONTROL")) == NULL) 201 v = getenv("VERSION_CONTROL"); 202 if (v != NULL) 203 backup_type = get_version(v); 204 205 /* parse switches */ 206 Argc = argc; 207 Argv = argv; 208 get_some_switches(); 209 210 if (backup_type == undefined) 211 backup_type = posix ? none : numbered_existing; 212 213 /* make sure we clean up /tmp in case of disaster */ 214 set_signals(0); 215 216 for (open_patch_file(filearg[1]); there_is_another_patch(); 217 reinitialize_almost_everything()) { 218 /* for each patch in patch file */ 219 220 warn_on_invalid_line = true; 221 222 if (outname == NULL) 223 outname = savestr(filearg[0]); 224 225 /* for ed script just up and do it and exit */ 226 if (diff_type == ED_DIFF) { 227 do_ed_script(); 228 continue; 229 } 230 /* initialize the patched file */ 231 if (!skip_rest_of_patch) 232 init_output(TMPOUTNAME); 233 234 /* initialize reject file */ 235 init_reject(TMPREJNAME); 236 237 /* find out where all the lines are */ 238 if (!skip_rest_of_patch) 239 scan_input(filearg[0]); 240 241 /* from here on, open no standard i/o files, because malloc */ 242 /* might misfire and we can't catch it easily */ 243 244 /* apply each hunk of patch */ 245 hunk = 0; 246 failed = 0; 247 out_of_mem = false; 248 while (another_hunk()) { 249 hunk++; 250 fuzz = 0; 251 mymaxfuzz = pch_context(); 252 if (maxfuzz < mymaxfuzz) 253 mymaxfuzz = maxfuzz; 254 if (!skip_rest_of_patch) { 255 do { 256 where = locate_hunk(fuzz); 257 if (hunk == 1 && where == 0 && !force) { 258 /* dwim for reversed patch? */ 259 if (!pch_swap()) { 260 if (fuzz == 0) 261 say("Not enough memory to try swapped hunk! Assuming unswapped.\n"); 262 continue; 263 } 264 reverse = !reverse; 265 /* try again */ 266 where = locate_hunk(fuzz); 267 if (where == 0) { 268 /* didn't find it swapped */ 269 if (!pch_swap()) 270 /* put it back to normal */ 271 fatal("lost hunk on alloc error!\n"); 272 reverse = !reverse; 273 } else if (noreverse) { 274 if (!pch_swap()) 275 /* put it back to normal */ 276 fatal("lost hunk on alloc error!\n"); 277 reverse = !reverse; 278 say("Ignoring previously applied (or reversed) patch.\n"); 279 skip_rest_of_patch = true; 280 } else if (batch) { 281 if (verbose) 282 say("%seversed (or previously applied) patch detected! %s -R.", 283 reverse ? "R" : "Unr", 284 reverse ? "Assuming" : "Ignoring"); 285 } else { 286 ask("%seversed (or previously applied) patch detected! %s -R? [y] ", 287 reverse ? "R" : "Unr", 288 reverse ? "Assume" : "Ignore"); 289 if (*buf == 'n') { 290 ask("Apply anyway? [n] "); 291 if (*buf != 'y') 292 skip_rest_of_patch = true; 293 where = 0; 294 reverse = !reverse; 295 if (!pch_swap()) 296 /* put it back to normal */ 297 fatal("lost hunk on alloc error!\n"); 298 } 299 } 300 } 301 } while (!skip_rest_of_patch && where == 0 && 302 ++fuzz <= mymaxfuzz); 303 304 if (skip_rest_of_patch) { /* just got decided */ 305 if (ferror(ofp) || fclose(ofp)) { 306 say("Error writing %s\n", 307 TMPOUTNAME); 308 error = 1; 309 } 310 ofp = NULL; 311 } 312 } 313 newwhere = pch_newfirst() + last_offset; 314 if (skip_rest_of_patch) { 315 abort_hunk(); 316 failed++; 317 if (verbose) 318 say("Hunk #%d ignored at %ld.\n", 319 hunk, newwhere); 320 } else if (where == 0) { 321 abort_hunk(); 322 failed++; 323 if (verbose) 324 say("Hunk #%d failed at %ld.\n", 325 hunk, newwhere); 326 } else { 327 apply_hunk(where); 328 if (verbose) { 329 say("Hunk #%d succeeded at %ld", 330 hunk, newwhere); 331 if (fuzz != 0) 332 say(" with fuzz %ld", fuzz); 333 if (last_offset) 334 say(" (offset %ld line%s)", 335 last_offset, 336 last_offset == 1L ? "" : "s"); 337 say(".\n"); 338 } 339 } 340 } 341 342 if (out_of_mem && using_plan_a) { 343 Argc = Argc_last; 344 Argv = Argv_last; 345 say("\n\nRan out of memory using Plan A--trying again...\n\n"); 346 if (ofp) 347 fclose(ofp); 348 ofp = NULL; 349 if (rejfp) 350 fclose(rejfp); 351 rejfp = NULL; 352 continue; 353 } 354 if (hunk == 0) 355 fatal("Internal error: hunk should not be 0\n"); 356 357 /* finish spewing out the new file */ 358 if (!skip_rest_of_patch && !spew_output()) { 359 say("Can't write %s\n", TMPOUTNAME); 360 error = 1; 361 } 362 363 /* and put the output where desired */ 364 ignore_signals(); 365 if (!skip_rest_of_patch) { 366 struct stat statbuf; 367 char *realout = outname; 368 369 if (!check_only) { 370 if (move_file(TMPOUTNAME, outname) < 0) { 371 toutkeep = true; 372 realout = TMPOUTNAME; 373 chmod(TMPOUTNAME, filemode); 374 } else 375 chmod(outname, filemode); 376 377 if (remove_empty_files && 378 stat(realout, &statbuf) == 0 && 379 statbuf.st_size == 0) { 380 if (verbose) 381 say("Removing %s (empty after patching).\n", 382 realout); 383 unlink(realout); 384 } 385 } 386 } 387 if (ferror(rejfp) || fclose(rejfp)) { 388 say("Error writing %s\n", rejname); 389 error = 1; 390 } 391 rejfp = NULL; 392 if (failed) { 393 error = 1; 394 if (*rejname == '\0') { 395 if (strlcpy(rejname, outname, 396 sizeof(rejname)) >= sizeof(rejname)) 397 fatal("filename %s is too long\n", outname); 398 if (strlcat(rejname, REJEXT, 399 sizeof(rejname)) >= sizeof(rejname)) 400 fatal("filename %s is too long\n", outname); 401 } 402 if (skip_rest_of_patch) { 403 say("%d out of %d hunks ignored--saving rejects to %s\n", 404 failed, hunk, rejname); 405 } else { 406 say("%d out of %d hunks failed--saving rejects to %s\n", 407 failed, hunk, rejname); 408 } 409 if (!check_only && move_file(TMPREJNAME, rejname) < 0) 410 trejkeep = true; 411 } 412 set_signals(1); 413 } 414 my_exit(error); 415 /* NOTREACHED */ 416 } 417 418 /* Prepare to find the next patch to do in the patch file. */ 419 420 static void 421 reinitialize_almost_everything(void) 422 { 423 re_patch(); 424 re_input(); 425 426 input_lines = 0; 427 last_frozen_line = 0; 428 429 filec = 0; 430 if (!out_of_mem) { 431 free(filearg[0]); 432 filearg[0] = NULL; 433 } 434 435 free(outname); 436 outname = NULL; 437 438 last_offset = 0; 439 diff_type = 0; 440 441 free(revision); 442 revision = NULL; 443 444 reverse = reverse_flag_specified; 445 skip_rest_of_patch = false; 446 447 get_some_switches(); 448 } 449 450 /* Process switches and filenames. */ 451 452 static void 453 get_some_switches(void) 454 { 455 const char *options = "b::B:cCd:D:eEfF:i:lnNo:p:r:RstuvV:x:z:"; 456 static struct option longopts[] = { 457 {"backup", no_argument, 0, 'b'}, 458 {"batch", no_argument, 0, 't'}, 459 {"check", no_argument, 0, 'C'}, 460 {"context", no_argument, 0, 'c'}, 461 {"debug", required_argument, 0, 'x'}, 462 {"directory", required_argument, 0, 'd'}, 463 {"ed", no_argument, 0, 'e'}, 464 {"force", no_argument, 0, 'f'}, 465 {"forward", no_argument, 0, 'N'}, 466 {"fuzz", required_argument, 0, 'F'}, 467 {"ifdef", required_argument, 0, 'D'}, 468 {"input", required_argument, 0, 'i'}, 469 {"ignore-whitespace", no_argument, 0, 'l'}, 470 {"normal", no_argument, 0, 'n'}, 471 {"output", required_argument, 0, 'o'}, 472 {"prefix", required_argument, 0, 'B'}, 473 {"quiet", no_argument, 0, 's'}, 474 {"reject-file", required_argument, 0, 'r'}, 475 {"remove-empty-files", no_argument, 0, 'E'}, 476 {"reverse", no_argument, 0, 'R'}, 477 {"silent", no_argument, 0, 's'}, 478 {"strip", required_argument, 0, 'p'}, 479 {"suffix", required_argument, 0, 'z'}, 480 {"unified", no_argument, 0, 'u'}, 481 {"version", no_argument, 0, 'v'}, 482 {"version-control", required_argument, 0, 'V'}, 483 {"posix", no_argument, &posix, 1}, 484 {NULL, 0, 0, 0} 485 }; 486 int ch; 487 488 rejname[0] = '\0'; 489 Argc_last = Argc; 490 Argv_last = Argv; 491 if (!Argc) 492 return; 493 optreset = optind = 1; 494 while ((ch = getopt_long(Argc, Argv, options, longopts, NULL)) != -1) { 495 switch (ch) { 496 case 'b': 497 if (backup_type == undefined) 498 backup_type = numbered_existing; 499 if (optarg == NULL) 500 break; 501 if (verbose) 502 say("Warning, the ``-b suffix'' option has been" 503 " obsoleted by the -z option.\n"); 504 /* FALLTHROUGH */ 505 case 'z': 506 /* must directly follow 'b' case for backwards compat */ 507 simple_backup_suffix = savestr(optarg); 508 break; 509 case 'B': 510 origprae = savestr(optarg); 511 break; 512 case 'c': 513 diff_type = CONTEXT_DIFF; 514 break; 515 case 'C': 516 check_only = true; 517 break; 518 case 'd': 519 if (chdir(optarg) < 0) 520 pfatal("can't cd to %s", optarg); 521 break; 522 case 'D': 523 do_defines = true; 524 if (!isalpha((unsigned char)*optarg) && *optarg != '_') 525 fatal("argument to -D is not an identifier\n"); 526 snprintf(if_defined, sizeof if_defined, 527 "#ifdef %s\n", optarg); 528 snprintf(not_defined, sizeof not_defined, 529 "#ifndef %s\n", optarg); 530 snprintf(end_defined, sizeof end_defined, 531 "#endif /* %s */\n", optarg); 532 break; 533 case 'e': 534 diff_type = ED_DIFF; 535 break; 536 case 'E': 537 remove_empty_files = true; 538 break; 539 case 'f': 540 force = true; 541 break; 542 case 'F': 543 maxfuzz = atoi(optarg); 544 break; 545 case 'i': 546 if (++filec == MAXFILEC) 547 fatal("too many file arguments\n"); 548 filearg[filec] = savestr(optarg); 549 break; 550 case 'l': 551 canonicalize = true; 552 break; 553 case 'n': 554 diff_type = NORMAL_DIFF; 555 break; 556 case 'N': 557 noreverse = true; 558 break; 559 case 'o': 560 outname = savestr(optarg); 561 break; 562 case 'p': 563 strippath = atoi(optarg); 564 break; 565 case 'r': 566 if (strlcpy(rejname, optarg, 567 sizeof(rejname)) >= sizeof(rejname)) 568 fatal("argument for -r is too long\n"); 569 break; 570 case 'R': 571 reverse = true; 572 reverse_flag_specified = true; 573 break; 574 case 's': 575 verbose = false; 576 break; 577 case 't': 578 batch = true; 579 break; 580 case 'u': 581 diff_type = UNI_DIFF; 582 break; 583 case 'v': 584 version(); 585 break; 586 case 'V': 587 backup_type = get_version(optarg); 588 break; 589 #ifdef DEBUGGING 590 case 'x': 591 debug = atoi(optarg); 592 break; 593 #endif 594 default: 595 if (ch != '\0') 596 usage(); 597 break; 598 } 599 } 600 Argc -= optind; 601 Argv += optind; 602 603 if (Argc > 0) { 604 filearg[0] = savestr(*Argv++); 605 Argc--; 606 while (Argc > 0) { 607 if (++filec == MAXFILEC) 608 fatal("too many file arguments\n"); 609 filearg[filec] = savestr(*Argv++); 610 Argc--; 611 } 612 } 613 614 if (getenv("POSIXLY_CORRECT") != NULL) 615 posix = 1; 616 } 617 618 static void 619 usage(void) 620 { 621 fprintf(stderr, 622 "usage: patch [-bCcEeflNnRstuv] [-B backup-prefix] [-D symbol] [-d directory]\n" 623 " [-F max-fuzz] [-i patchfile] [-o out-file] [-p strip-count]\n" 624 " [-r rej-name] [-V t | nil | never] [-x number] [-z backup-ext]\n" 625 " [--posix] [origfile [patchfile]]\n" 626 " patch <patchfile\n"); 627 my_exit(EXIT_FAILURE); 628 } 629 630 /* 631 * Attempt to find the right place to apply this hunk of patch. 632 */ 633 static LINENUM 634 locate_hunk(LINENUM fuzz) 635 { 636 LINENUM first_guess = pch_first() + last_offset; 637 LINENUM offset; 638 LINENUM pat_lines = pch_ptrn_lines(); 639 LINENUM max_pos_offset = input_lines - first_guess - pat_lines + 1; 640 LINENUM max_neg_offset = first_guess - last_frozen_line - 1 + pch_context(); 641 642 if (pat_lines == 0) { /* null range matches always */ 643 if (verbose && fuzz == 0 && (diff_type == CONTEXT_DIFF 644 || diff_type == NEW_CONTEXT_DIFF 645 || diff_type == UNI_DIFF)) { 646 say("Empty context always matches.\n"); 647 } 648 return (first_guess); 649 } 650 if (max_neg_offset >= first_guess) /* do not try lines < 0 */ 651 max_neg_offset = first_guess - 1; 652 if (first_guess <= input_lines && patch_match(first_guess, 0, fuzz)) 653 return first_guess; 654 for (offset = 1; ; offset++) { 655 bool check_after = (offset <= max_pos_offset); 656 bool check_before = (offset <= max_neg_offset); 657 658 if (check_after && patch_match(first_guess, offset, fuzz)) { 659 #ifdef DEBUGGING 660 if (debug & 1) 661 say("Offset changing from %ld to %ld\n", 662 last_offset, offset); 663 #endif 664 last_offset = offset; 665 return first_guess + offset; 666 } else if (check_before && patch_match(first_guess, -offset, fuzz)) { 667 #ifdef DEBUGGING 668 if (debug & 1) 669 say("Offset changing from %ld to %ld\n", 670 last_offset, -offset); 671 #endif 672 last_offset = -offset; 673 return first_guess - offset; 674 } else if (!check_before && !check_after) 675 return 0; 676 } 677 } 678 679 /* We did not find the pattern, dump out the hunk so they can handle it. */ 680 681 static void 682 abort_context_hunk(void) 683 { 684 LINENUM i; 685 const LINENUM pat_end = pch_end(); 686 /* 687 * add in last_offset to guess the same as the previous successful 688 * hunk 689 */ 690 const LINENUM oldfirst = pch_first() + last_offset; 691 const LINENUM newfirst = pch_newfirst() + last_offset; 692 const LINENUM oldlast = oldfirst + pch_ptrn_lines() - 1; 693 const LINENUM newlast = newfirst + pch_repl_lines() - 1; 694 const char *stars = (diff_type >= NEW_CONTEXT_DIFF ? " ****" : ""); 695 const char *minuses = (diff_type >= NEW_CONTEXT_DIFF ? " ----" : " -----"); 696 697 fprintf(rejfp, "***************\n"); 698 for (i = 0; i <= pat_end; i++) { 699 switch (pch_char(i)) { 700 case '*': 701 if (oldlast < oldfirst) 702 fprintf(rejfp, "*** 0%s\n", stars); 703 else if (oldlast == oldfirst) 704 fprintf(rejfp, "*** %ld%s\n", oldfirst, stars); 705 else 706 fprintf(rejfp, "*** %ld,%ld%s\n", oldfirst, 707 oldlast, stars); 708 break; 709 case '=': 710 if (newlast < newfirst) 711 fprintf(rejfp, "--- 0%s\n", minuses); 712 else if (newlast == newfirst) 713 fprintf(rejfp, "--- %ld%s\n", newfirst, minuses); 714 else 715 fprintf(rejfp, "--- %ld,%ld%s\n", newfirst, 716 newlast, minuses); 717 break; 718 case '\n': 719 fprintf(rejfp, "%s", pfetch(i)); 720 break; 721 case ' ': 722 case '-': 723 case '+': 724 case '!': 725 fprintf(rejfp, "%c %s", pch_char(i), pfetch(i)); 726 break; 727 default: 728 fatal("fatal internal error in abort_context_hunk\n"); 729 } 730 } 731 } 732 733 static void 734 rej_line(int ch, LINENUM i) 735 { 736 size_t len; 737 const char *line = pfetch(i); 738 739 len = strlen(line); 740 741 fprintf(rejfp, "%c%s", ch, line); 742 if (len == 0 || line[len-1] != '\n') 743 fprintf(rejfp, "\n\\ No newline at end of file\n"); 744 } 745 746 static void 747 abort_hunk(void) 748 { 749 LINENUM i, j, split; 750 int ch1, ch2; 751 const LINENUM pat_end = pch_end(); 752 const LINENUM oldfirst = pch_first() + last_offset; 753 const LINENUM newfirst = pch_newfirst() + last_offset; 754 755 if (diff_type != UNI_DIFF) { 756 abort_context_hunk(); 757 return; 758 } 759 split = -1; 760 for (i = 0; i <= pat_end; i++) { 761 if (pch_char(i) == '=') { 762 split = i; 763 break; 764 } 765 } 766 if (split == -1) { 767 fprintf(rejfp, "malformed hunk: no split found\n"); 768 return; 769 } 770 i = 0; 771 j = split + 1; 772 fprintf(rejfp, "@@ -%ld,%ld +%ld,%ld @@\n", 773 pch_ptrn_lines() ? oldfirst : 0, 774 pch_ptrn_lines(), newfirst, pch_repl_lines()); 775 while (i < split || j <= pat_end) { 776 ch1 = i < split ? pch_char(i) : -1; 777 ch2 = j <= pat_end ? pch_char(j) : -1; 778 if (ch1 == '-') { 779 rej_line('-', i); 780 i++; 781 } else if (ch1 == ' ' && ch2 == ' ') { 782 rej_line(' ', i); 783 i++; 784 j++; 785 } else if (ch1 == '!' && ch2 == '!') { 786 while (i < split && ch1 == '!') { 787 rej_line('-', i); 788 i++; 789 ch1 = i < split ? pch_char(i) : -1; 790 } 791 while (j <= pat_end && ch2 == '!') { 792 rej_line('+', j); 793 j++; 794 ch2 = j <= pat_end ? pch_char(j) : -1; 795 } 796 } else if (ch1 == '*') { 797 i++; 798 } else if (ch2 == '+' || ch2 == ' ') { 799 rej_line(ch2, j); 800 j++; 801 } else { 802 fprintf(rejfp, "internal error on (%ld %ld %ld)\n", 803 i, split, j); 804 rej_line(ch1, i); 805 rej_line(ch2, j); 806 return; 807 } 808 } 809 } 810 811 /* We found where to apply it (we hope), so do it. */ 812 813 static void 814 apply_hunk(LINENUM where) 815 { 816 LINENUM old = 1; 817 const LINENUM lastline = pch_ptrn_lines(); 818 LINENUM new = lastline + 1; 819 #define OUTSIDE 0 820 #define IN_IFNDEF 1 821 #define IN_IFDEF 2 822 #define IN_ELSE 3 823 int def_state = OUTSIDE; 824 const LINENUM pat_end = pch_end(); 825 826 where--; 827 while (pch_char(new) == '=' || pch_char(new) == '\n') 828 new++; 829 830 while (old <= lastline) { 831 if (pch_char(old) == '-') { 832 copy_till(where + old - 1, false); 833 if (do_defines) { 834 if (def_state == OUTSIDE) { 835 fputs(not_defined, ofp); 836 def_state = IN_IFNDEF; 837 } else if (def_state == IN_IFDEF) { 838 fputs(else_defined, ofp); 839 def_state = IN_ELSE; 840 } 841 fputs(pfetch(old), ofp); 842 } 843 last_frozen_line++; 844 old++; 845 } else if (new > pat_end) { 846 break; 847 } else if (pch_char(new) == '+') { 848 copy_till(where + old - 1, false); 849 if (do_defines) { 850 if (def_state == IN_IFNDEF) { 851 fputs(else_defined, ofp); 852 def_state = IN_ELSE; 853 } else if (def_state == OUTSIDE) { 854 fputs(if_defined, ofp); 855 def_state = IN_IFDEF; 856 } 857 } 858 fputs(pfetch(new), ofp); 859 new++; 860 } else if (pch_char(new) != pch_char(old)) { 861 say("Out-of-sync patch, lines %ld,%ld--mangled text or line numbers, maybe?\n", 862 pch_hunk_beg() + old, 863 pch_hunk_beg() + new); 864 #ifdef DEBUGGING 865 say("oldchar = '%c', newchar = '%c'\n", 866 pch_char(old), pch_char(new)); 867 #endif 868 my_exit(2); 869 } else if (pch_char(new) == '!') { 870 copy_till(where + old - 1, false); 871 if (do_defines) { 872 fputs(not_defined, ofp); 873 def_state = IN_IFNDEF; 874 } 875 while (pch_char(old) == '!') { 876 if (do_defines) { 877 fputs(pfetch(old), ofp); 878 } 879 last_frozen_line++; 880 old++; 881 } 882 if (do_defines) { 883 fputs(else_defined, ofp); 884 def_state = IN_ELSE; 885 } 886 while (pch_char(new) == '!') { 887 fputs(pfetch(new), ofp); 888 new++; 889 } 890 } else { 891 if (pch_char(new) != ' ') 892 fatal("Internal error: expected ' '\n"); 893 old++; 894 new++; 895 if (do_defines && def_state != OUTSIDE) { 896 fputs(end_defined, ofp); 897 def_state = OUTSIDE; 898 } 899 } 900 } 901 if (new <= pat_end && pch_char(new) == '+') { 902 copy_till(where + old - 1, false); 903 if (do_defines) { 904 if (def_state == OUTSIDE) { 905 fputs(if_defined, ofp); 906 def_state = IN_IFDEF; 907 } else if (def_state == IN_IFNDEF) { 908 fputs(else_defined, ofp); 909 def_state = IN_ELSE; 910 } 911 } 912 while (new <= pat_end && pch_char(new) == '+') { 913 fputs(pfetch(new), ofp); 914 new++; 915 } 916 } 917 if (do_defines && def_state != OUTSIDE) { 918 fputs(end_defined, ofp); 919 } 920 } 921 922 /* 923 * Open the new file. 924 */ 925 static void 926 init_output(const char *name) 927 { 928 ofp = fopen(name, "w"); 929 if (ofp == NULL) 930 pfatal("can't create %s", name); 931 } 932 933 /* 934 * Open a file to put hunks we can't locate. 935 */ 936 static void 937 init_reject(const char *name) 938 { 939 rejfp = fopen(name, "w"); 940 if (rejfp == NULL) 941 pfatal("can't create %s", name); 942 } 943 944 /* 945 * Copy input file to output, up to wherever hunk is to be applied. 946 * If endoffile is true, treat the last line specially since it may 947 * lack a newline. 948 */ 949 static void 950 copy_till(LINENUM lastline, bool endoffile) 951 { 952 if (last_frozen_line > lastline) 953 fatal("misordered hunks! output would be garbled\n"); 954 while (last_frozen_line < lastline) { 955 if (++last_frozen_line == lastline && endoffile) 956 dump_line(last_frozen_line, !last_line_missing_eol); 957 else 958 dump_line(last_frozen_line, true); 959 } 960 } 961 962 /* 963 * Finish copying the input file to the output file. 964 */ 965 static bool 966 spew_output(void) 967 { 968 int rv; 969 970 #ifdef DEBUGGING 971 if (debug & 256) 972 say("il=%ld lfl=%ld\n", input_lines, last_frozen_line); 973 #endif 974 if (input_lines) 975 copy_till(input_lines, true); /* dump remainder of file */ 976 rv = ferror(ofp) == 0 && fclose(ofp) == 0; 977 ofp = NULL; 978 return rv; 979 } 980 981 /* 982 * Copy one line from input to output. 983 */ 984 static void 985 dump_line(LINENUM line, bool write_newline) 986 { 987 char *s; 988 989 s = ifetch(line, 0); 990 if (s == NULL) 991 return; 992 /* Note: string is not NUL terminated. */ 993 for (; *s != '\n'; s++) 994 putc(*s, ofp); 995 if (write_newline) 996 putc('\n', ofp); 997 } 998 999 /* 1000 * Does the patch pattern match at line base+offset? 1001 */ 1002 static bool 1003 patch_match(LINENUM base, LINENUM offset, LINENUM fuzz) 1004 { 1005 LINENUM pline = 1 + fuzz; 1006 LINENUM iline; 1007 LINENUM pat_lines = pch_ptrn_lines() - fuzz; 1008 const char *ilineptr; 1009 const char *plineptr; 1010 short plinelen; 1011 1012 for (iline = base + offset + fuzz; pline <= pat_lines; pline++, iline++) { 1013 ilineptr = ifetch(iline, offset >= 0); 1014 if (ilineptr == NULL) 1015 return false; 1016 plineptr = pfetch(pline); 1017 plinelen = pch_line_len(pline); 1018 if (canonicalize) { 1019 if (!similar(ilineptr, plineptr, plinelen)) 1020 return false; 1021 } else if (strnNE(ilineptr, plineptr, plinelen)) 1022 return false; 1023 if (iline == input_lines) { 1024 /* 1025 * We are looking at the last line of the file. 1026 * If the file has no eol, the patch line should 1027 * not have one either and vice-versa. Note that 1028 * plinelen > 0. 1029 */ 1030 if (last_line_missing_eol) { 1031 if (plineptr[plinelen - 1] == '\n') 1032 return false; 1033 } else { 1034 if (plineptr[plinelen - 1] != '\n') 1035 return false; 1036 } 1037 } 1038 } 1039 return true; 1040 } 1041 1042 /* 1043 * Do two lines match with canonicalized white space? 1044 */ 1045 static bool 1046 similar(const char *a, const char *b, int len) 1047 { 1048 while (len) { 1049 if (isspace((unsigned char)*b)) { /* whitespace (or \n) to match? */ 1050 if (!isspace((unsigned char)*a)) /* no corresponding whitespace? */ 1051 return false; 1052 while (len && isspace((unsigned char)*b) && *b != '\n') 1053 b++, len--; /* skip pattern whitespace */ 1054 while (isspace((unsigned char)*a) && *a != '\n') 1055 a++; /* skip target whitespace */ 1056 if (*a == '\n' || *b == '\n') 1057 return (*a == *b); /* should end in sync */ 1058 } else if (*a++ != *b++) /* match non-whitespace chars */ 1059 return false; 1060 else 1061 len--; /* probably not necessary */ 1062 } 1063 return true; /* actually, this is not reached */ 1064 /* since there is always a \n */ 1065 } 1066