1/* $OpenBSD: patch.c,v 1.48 2009/10/27 23:59:41 deraadt Exp $ */ 2 3/* 4 * patch - a program to apply diffs to original files 5 * 6 * Copyright 1986, Larry Wall 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following condition is met: 10 * 1. Redistributions of source code must retain the above copyright notice, 11 * this condition and the following disclaimer. 12 * 13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY 14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 15 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 16 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR 17 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 19 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 20 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23 * SUCH DAMAGE. 24 * 25 * -C option added in 1998, original code by Marc Espie, based on FreeBSD 26 * behaviour 27 */ 28 29#include <sys/types.h> 30#include <sys/stat.h> 31#include <unistd.h> 32 33#include <ctype.h> 34#include <getopt.h> 35#include <limits.h> 36#include <stdio.h> 37#include <string.h> 38#include <stdlib.h> 39 40#include "common.h" 41#include "util.h" 42#include "pch.h" 43#include "inp.h" 44#include "backupfile.h" 45#include "pathnames.h" 46 47mode_t filemode = 0644; 48 49char buf[MAXLINELEN]; /* general purpose buffer */ 50 51bool using_plan_a = true; /* try to keep everything in memory */ 52bool out_of_mem = false; /* ran out of memory in plan a */ 53 54#define MAXFILEC 2 55 56char *filearg[MAXFILEC]; 57bool ok_to_create_file = false; 58char *outname = NULL; 59char *origprae = NULL; 60char *TMPOUTNAME; 61char *TMPINNAME; 62char *TMPREJNAME; 63char *TMPPATNAME; 64bool toutkeep = false; 65bool trejkeep = false; 66bool warn_on_invalid_line; 67bool last_line_missing_eol; 68 69#ifdef DEBUGGING 70int debug = 0; 71#endif 72 73bool force = false; 74bool batch = false; 75int verbose = false; 76bool reverse = false; 77bool noreverse = false; 78bool skip_rest_of_patch = false; 79int strippath = 957; 80bool canonicalize = false; 81bool check_only = false; 82int diff_type = 0; 83char *revision = NULL; /* prerequisite revision, if any */ 84LINENUM input_lines = 0; /* how long is input file in lines */ 85int posix = 0; /* strict POSIX mode? */ 86 87static void reinitialize_almost_everything(void); 88static void get_some_switches(void); 89static LINENUM locate_hunk(LINENUM); 90static void abort_context_hunk(void); 91static void rej_line(int, LINENUM); 92static void abort_hunk(void); 93static void apply_hunk(LINENUM); 94static void init_output(const char *); 95static void init_reject(const char *); 96static void copy_till(LINENUM, bool); 97static void spew_output(void); 98static void dump_line(LINENUM, bool); 99static bool patch_match(LINENUM, LINENUM, LINENUM); 100static bool similar(const char *, const char *, int); 101static __dead void usage(void); 102 103/* true if -E was specified on command line. */ 104static bool remove_empty_files = false; 105 106/* true if -R was specified on command line. */ 107static bool reverse_flag_specified = false; 108 109/* buffer holding the name of the rejected patch file. */ 110static char rejname[NAME_MAX + 1]; 111 112/* buffer for stderr */ 113static char serrbuf[BUFSIZ]; 114 115/* how many input lines have been irretractibly output */ 116static LINENUM last_frozen_line = 0; 117 118static int Argc; /* guess */ 119static char **Argv; 120static int Argc_last; /* for restarting plan_b */ 121static char **Argv_last; 122 123static FILE *ofp = NULL; /* output file pointer */ 124static FILE *rejfp = NULL; /* reject file pointer */ 125 126static int filec = 0; /* how many file arguments? */ 127static LINENUM last_offset = 0; 128static LINENUM maxfuzz = 2; 129 130/* patch using ifdef, ifndef, etc. */ 131static bool do_defines = false; 132/* #ifdef xyzzy */ 133static char if_defined[128]; 134/* #ifndef xyzzy */ 135static char not_defined[128]; 136/* #else */ 137static const char else_defined[] = "#else\n"; 138/* #endif xyzzy */ 139static char end_defined[128]; 140 141 142/* Apply a set of diffs as appropriate. */ 143 144int 145main(int argc, char *argv[]) 146{ 147 int error = 0, hunk, failed, i, fd; 148 bool patch_seen; 149 LINENUM where = 0, newwhere, fuzz, mymaxfuzz; 150 const char *tmpdir; 151 char *v; 152 153 setbuf(stderr, serrbuf); 154 for (i = 0; i < MAXFILEC; i++) 155 filearg[i] = NULL; 156 157 /* Cons up the names of the temporary files. */ 158 if ((tmpdir = getenv("TMPDIR")) == NULL || *tmpdir == '\0') 159 tmpdir = _PATH_TMP; 160 for (i = strlen(tmpdir) - 1; i > 0 && tmpdir[i] == '/'; i--) 161 ; 162 i++; 163 if (asprintf(&TMPOUTNAME, "%.*s/patchoXXXXXXXXXX", i, tmpdir) == -1) 164 fatal("cannot allocate memory"); 165 if ((fd = mkstemp(TMPOUTNAME)) < 0) 166 pfatal("can't create %s", TMPOUTNAME); 167 close(fd); 168 169 if (asprintf(&TMPINNAME, "%.*s/patchiXXXXXXXXXX", i, tmpdir) == -1) 170 fatal("cannot allocate memory"); 171 if ((fd = mkstemp(TMPINNAME)) < 0) 172 pfatal("can't create %s", TMPINNAME); 173 close(fd); 174 175 if (asprintf(&TMPREJNAME, "%.*s/patchrXXXXXXXXXX", i, tmpdir) == -1) 176 fatal("cannot allocate memory"); 177 if ((fd = mkstemp(TMPREJNAME)) < 0) 178 pfatal("can't create %s", TMPREJNAME); 179 close(fd); 180 181 if (asprintf(&TMPPATNAME, "%.*s/patchpXXXXXXXXXX", i, tmpdir) == -1) 182 fatal("cannot allocate memory"); 183 if ((fd = mkstemp(TMPPATNAME)) < 0) 184 pfatal("can't create %s", TMPPATNAME); 185 close(fd); 186 187 v = getenv("SIMPLE_BACKUP_SUFFIX"); 188 if (v) 189 simple_backup_suffix = v; 190 else 191 simple_backup_suffix = ORIGEXT; 192 193 /* parse switches */ 194 Argc = argc; 195 Argv = argv; 196 get_some_switches(); 197 198 if (backup_type == none) { 199 if ((v = getenv("PATCH_VERSION_CONTROL")) == NULL) 200 v = getenv("VERSION_CONTROL"); 201 if (v != NULL || !posix) 202 backup_type = get_version(v); /* OK to pass NULL. */ 203 } 204 205 /* make sure we clean up /tmp in case of disaster */ 206 set_signals(0); 207 208 patch_seen = false; 209 for (open_patch_file(filearg[1]); there_is_another_patch(); 210 reinitialize_almost_everything()) { 211 /* for each patch in patch file */ 212 213 patch_seen = true; 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 } 400 401 if (!patch_seen) 402 error = 2; 403 404 my_exit(error); 405 /* NOTREACHED */ 406} 407 408/* Prepare to find the next patch to do in the patch file. */ 409 410static void 411reinitialize_almost_everything(void) 412{ 413 re_patch(); 414 re_input(); 415 416 input_lines = 0; 417 last_frozen_line = 0; 418 419 filec = 0; 420 if (!out_of_mem) { 421 free(filearg[0]); 422 filearg[0] = NULL; 423 } 424 425 free(outname); 426 outname = NULL; 427 428 last_offset = 0; 429 diff_type = 0; 430 431 free(revision); 432 revision = NULL; 433 434 reverse = reverse_flag_specified; 435 skip_rest_of_patch = false; 436 437 get_some_switches(); 438} 439 440/* Process switches and filenames. */ 441 442static void 443get_some_switches(void) 444{ 445 const char *options = "b::B:cCd:D:eEfF:i:lnNo:p:r:RstuvV:x:z:"; 446 static struct option longopts[] = { 447 {"backup", no_argument, 0, 'b'}, 448 {"batch", no_argument, 0, 't'}, 449 {"binary", no_argument, 0, 1}, 450 {"check", no_argument, 0, 'C'}, 451 {"context", no_argument, 0, 'c'}, 452 {"debug", required_argument, 0, 'x'}, 453 {"directory", required_argument, 0, 'd'}, 454 {"dry-run", no_argument, 0, 'C'}, 455 {"ed", no_argument, 0, 'e'}, 456 {"force", no_argument, 0, 'f'}, 457 {"forward", no_argument, 0, 'N'}, 458 {"fuzz", required_argument, 0, 'F'}, 459 {"ifdef", required_argument, 0, 'D'}, 460 {"input", required_argument, 0, 'i'}, 461 {"ignore-whitespace", no_argument, 0, 'l'}, 462 {"normal", no_argument, 0, 'n'}, 463 {"output", required_argument, 0, 'o'}, 464 {"prefix", required_argument, 0, 'B'}, 465 {"quiet", no_argument, 0, 's'}, 466 {"reject-file", required_argument, 0, 'r'}, 467 {"remove-empty-files", no_argument, 0, 'E'}, 468 {"reverse", no_argument, 0, 'R'}, 469 {"silent", no_argument, 0, 's'}, 470 {"strip", required_argument, 0, 'p'}, 471 {"suffix", required_argument, 0, 'z'}, 472 {"unified", no_argument, 0, 'u'}, 473 {"version", no_argument, 0, 'v'}, 474 {"version-control", required_argument, 0, 'V'}, 475 {"posix", no_argument, &posix, 1}, 476 {"verbose", no_argument, &verbose, true}, 477 {NULL, 0, 0, 0} 478 }; 479 int ch; 480 481 rejname[0] = '\0'; 482 Argc_last = Argc; 483 Argv_last = Argv; 484 if (!Argc) 485 return; 486 optreset = optind = 1; 487 while ((ch = getopt_long(Argc, Argv, options, longopts, NULL)) != -1) { 488 switch (ch) { 489 case 'b': 490 if (backup_type == none) 491 backup_type = numbered_existing; 492 if (optarg == NULL) 493 break; 494 if (verbose) 495 say("Warning, the ``-b suffix'' option has been" 496 " obsoleted by the -z option.\n"); 497 /* FALLTHROUGH */ 498 case 'z': 499 /* must directly follow 'b' case for backwards compat */ 500 simple_backup_suffix = savestr(optarg); 501 break; 502 case 'B': 503 origprae = savestr(optarg); 504 break; 505 case 'c': 506 diff_type = CONTEXT_DIFF; 507 break; 508 case 'C': 509 check_only = true; 510 break; 511 case 'd': 512 if (chdir(optarg) < 0) 513 pfatal("can't cd to %s", optarg); 514 break; 515 case 'D': 516 do_defines = true; 517 if (!isalpha(*optarg) && *optarg != '_') 518 fatal("argument to -D is not an identifier\n"); 519 snprintf(if_defined, sizeof if_defined, 520 "#ifdef %s\n", optarg); 521 snprintf(not_defined, sizeof not_defined, 522 "#ifndef %s\n", optarg); 523 snprintf(end_defined, sizeof end_defined, 524 "#endif /* %s */\n", optarg); 525 break; 526 case 'e': 527 diff_type = ED_DIFF; 528 break; 529 case 'E': 530 remove_empty_files = true; 531 break; 532 case 'f': 533 force = true; 534 break; 535 case 'F': 536 maxfuzz = atoi(optarg); 537 break; 538 case 'i': 539 if (++filec == MAXFILEC) 540 fatal("too many file arguments\n"); 541 filearg[filec] = savestr(optarg); 542 break; 543 case 'l': 544 canonicalize = true; 545 break; 546 case 'n': 547 diff_type = NORMAL_DIFF; 548 break; 549 case 'N': 550 noreverse = true; 551 break; 552 case 'o': 553 outname = savestr(optarg); 554 break; 555 case 'p': 556 strippath = atoi(optarg); 557 break; 558 case 'r': 559 if (strlcpy(rejname, optarg, 560 sizeof(rejname)) >= sizeof(rejname)) 561 fatal("argument for -r is too long\n"); 562 break; 563 case 'R': 564 reverse = true; 565 reverse_flag_specified = true; 566 break; 567 case 's': 568 verbose = false; 569 break; 570 case 't': 571 batch = true; 572 break; 573 case 'u': 574 diff_type = UNI_DIFF; 575 break; 576 case 'v': 577 version(); 578 break; 579 case 'V': 580 backup_type = get_version(optarg); 581 break; 582#ifdef DEBUGGING 583 case 'x': 584 debug = atoi(optarg); 585 break; 586#endif 587 case 1: 588 /* ignored */ 589 break; 590 default: 591 if (ch != '\0') 592 usage(); 593 break; 594 } 595 } 596 Argc -= optind; 597 Argv += optind; 598 599 if (Argc > 0) { 600 filearg[0] = savestr(*Argv++); 601 Argc--; 602 while (Argc > 0) { 603 if (++filec == MAXFILEC) 604 fatal("too many file arguments\n"); 605 filearg[filec] = savestr(*Argv++); 606 Argc--; 607 } 608 } 609 610 if (getenv("POSIXLY_CORRECT") != NULL) 611 posix = 1; 612} 613 614static __dead void 615usage(void) 616{ 617 fprintf(stderr, 618"usage: patch [-bCcEeflNnRstuv] [-B backup-prefix] [-D symbol] [-d directory]\n" 619" [-F max-fuzz] [-i patchfile] [-o out-file] [-p strip-count]\n" 620" [-r rej-name] [-V t | nil | never] [-x number] [-z backup-ext]\n" 621" [--posix] [origfile [patchfile]]\n" 622" patch <patchfile\n"); 623 my_exit(EXIT_SUCCESS); 624} 625 626/* 627 * Attempt to find the right place to apply this hunk of patch. 628 */ 629static LINENUM 630locate_hunk(LINENUM fuzz) 631{ 632 LINENUM first_guess = pch_first() + last_offset; 633 LINENUM offset; 634 LINENUM pat_lines = pch_ptrn_lines(); 635 LINENUM max_pos_offset = input_lines - first_guess - pat_lines + 1; 636 LINENUM max_neg_offset = first_guess - last_frozen_line - 1 + pch_context(); 637 638 if (pat_lines == 0) { /* null range matches always */ 639 if (verbose && fuzz == 0 && (diff_type == CONTEXT_DIFF 640 || diff_type == NEW_CONTEXT_DIFF 641 || diff_type == UNI_DIFF)) { 642 say("Empty context always matches.\n"); 643 } 644 return (first_guess); 645 } 646 if (max_neg_offset >= first_guess) /* do not try lines < 0 */ 647 max_neg_offset = first_guess - 1; 648 if (first_guess <= input_lines && patch_match(first_guess, 0, fuzz)) 649 return first_guess; 650 for (offset = 1; ; offset++) { 651 bool check_after = (offset <= max_pos_offset); 652 bool check_before = (offset <= max_neg_offset); 653 654 if (check_after && patch_match(first_guess, offset, fuzz)) { 655#ifdef DEBUGGING 656 if (debug & 1) 657 say("Offset changing from %ld to %ld\n", 658 last_offset, offset); 659#endif 660 last_offset = offset; 661 return first_guess + offset; 662 } else if (check_before && patch_match(first_guess, -offset, fuzz)) { 663#ifdef DEBUGGING 664 if (debug & 1) 665 say("Offset changing from %ld to %ld\n", 666 last_offset, -offset); 667#endif 668 last_offset = -offset; 669 return first_guess - offset; 670 } else if (!check_before && !check_after) 671 return 0; 672 } 673} 674 675/* We did not find the pattern, dump out the hunk so they can handle it. */ 676 677static void 678abort_context_hunk(void) 679{ 680 LINENUM i; 681 const LINENUM pat_end = pch_end(); 682 /* 683 * add in last_offset to guess the same as the previous successful 684 * hunk 685 */ 686 const LINENUM oldfirst = pch_first() + last_offset; 687 const LINENUM newfirst = pch_newfirst() + last_offset; 688 const LINENUM oldlast = oldfirst + pch_ptrn_lines() - 1; 689 const LINENUM newlast = newfirst + pch_repl_lines() - 1; 690 const char *stars = (diff_type >= NEW_CONTEXT_DIFF ? " ****" : ""); 691 const char *minuses = (diff_type >= NEW_CONTEXT_DIFF ? " ----" : " -----"); 692 693 fprintf(rejfp, "***************\n"); 694 for (i = 0; i <= pat_end; i++) { 695 switch (pch_char(i)) { 696 case '*': 697 if (oldlast < oldfirst) 698 fprintf(rejfp, "*** 0%s\n", stars); 699 else if (oldlast == oldfirst) 700 fprintf(rejfp, "*** %ld%s\n", oldfirst, stars); 701 else 702 fprintf(rejfp, "*** %ld,%ld%s\n", oldfirst, 703 oldlast, stars); 704 break; 705 case '=': 706 if (newlast < newfirst) 707 fprintf(rejfp, "--- 0%s\n", minuses); 708 else if (newlast == newfirst) 709 fprintf(rejfp, "--- %ld%s\n", newfirst, minuses); 710 else 711 fprintf(rejfp, "--- %ld,%ld%s\n", newfirst, 712 newlast, minuses); 713 break; 714 case '\n': 715 fprintf(rejfp, "%s", pfetch(i)); 716 break; 717 case ' ': 718 case '-': 719 case '+': 720 case '!': 721 fprintf(rejfp, "%c %s", pch_char(i), pfetch(i)); 722 break; 723 default: 724 fatal("fatal internal error in abort_context_hunk\n"); 725 } 726 } 727} 728 729static void 730rej_line(int ch, LINENUM i) 731{ 732 size_t len; 733 const char *line = pfetch(i); 734 735 len = strlen(line); 736 737 fprintf(rejfp, "%c%s", ch, line); 738 if (len == 0 || line[len-1] != '\n') 739 fprintf(rejfp, "\n\\ No newline at end of file\n"); 740} 741 742static void 743abort_hunk(void) 744{ 745 LINENUM i, j, split; 746 int ch1, ch2; 747 const LINENUM pat_end = pch_end(); 748 const LINENUM oldfirst = pch_first() + last_offset; 749 const LINENUM newfirst = pch_newfirst() + last_offset; 750 751 if (diff_type != UNI_DIFF) { 752 abort_context_hunk(); 753 return; 754 } 755 split = -1; 756 for (i = 0; i <= pat_end; i++) { 757 if (pch_char(i) == '=') { 758 split = i; 759 break; 760 } 761 } 762 if (split == -1) { 763 fprintf(rejfp, "malformed hunk: no split found\n"); 764 return; 765 } 766 i = 0; 767 j = split + 1; 768 fprintf(rejfp, "@@ -%ld,%ld +%ld,%ld @@\n", 769 pch_ptrn_lines() ? oldfirst : 0, 770 pch_ptrn_lines(), newfirst, pch_repl_lines()); 771 while (i < split || j <= pat_end) { 772 ch1 = i < split ? pch_char(i) : -1; 773 ch2 = j <= pat_end ? pch_char(j) : -1; 774 if (ch1 == '-') { 775 rej_line('-', i); 776 i++; 777 } else if (ch1 == ' ' && ch2 == ' ') { 778 rej_line(' ', i); 779 i++; 780 j++; 781 } else if (ch1 == '!' && ch2 == '!') { 782 while (i < split && ch1 == '!') { 783 rej_line('-', i); 784 i++; 785 ch1 = i < split ? pch_char(i) : -1; 786 } 787 while (j <= pat_end && ch2 == '!') { 788 rej_line('+', j); 789 j++; 790 ch2 = j <= pat_end ? pch_char(j) : -1; 791 } 792 } else if (ch1 == '*') { 793 i++; 794 } else if (ch2 == '+' || ch2 == ' ') { 795 rej_line(ch2, j); 796 j++; 797 } else { 798 fprintf(rejfp, "internal error on (%ld %ld %ld)\n", 799 i, split, j); 800 rej_line(ch1, i); 801 rej_line(ch2, j); 802 return; 803 } 804 } 805} 806 807/* We found where to apply it (we hope), so do it. */ 808 809static void 810apply_hunk(LINENUM where) 811{ 812 LINENUM old = 1; 813 const LINENUM lastline = pch_ptrn_lines(); 814 LINENUM new = lastline + 1; 815#define OUTSIDE 0 816#define IN_IFNDEF 1 817#define IN_IFDEF 2 818#define IN_ELSE 3 819 int def_state = OUTSIDE; 820 const LINENUM pat_end = pch_end(); 821 822 where--; 823 while (pch_char(new) == '=' || pch_char(new) == '\n') 824 new++; 825 826 while (old <= lastline) { 827 if (pch_char(old) == '-') { 828 copy_till(where + old - 1, false); 829 if (do_defines) { 830 if (def_state == OUTSIDE) { 831 fputs(not_defined, ofp); 832 def_state = IN_IFNDEF; 833 } else if (def_state == IN_IFDEF) { 834 fputs(else_defined, ofp); 835 def_state = IN_ELSE; 836 } 837 fputs(pfetch(old), ofp); 838 } 839 last_frozen_line++; 840 old++; 841 } else if (new > pat_end) { 842 break; 843 } else if (pch_char(new) == '+') { 844 copy_till(where + old - 1, false); 845 if (do_defines) { 846 if (def_state == IN_IFNDEF) { 847 fputs(else_defined, ofp); 848 def_state = IN_ELSE; 849 } else if (def_state == OUTSIDE) { 850 fputs(if_defined, ofp); 851 def_state = IN_IFDEF; 852 } 853 } 854 fputs(pfetch(new), ofp); 855 new++; 856 } else if (pch_char(new) != pch_char(old)) { 857 say("Out-of-sync patch, lines %ld,%ld--mangled text or line numbers, maybe?\n", 858 pch_hunk_beg() + old, 859 pch_hunk_beg() + new); 860#ifdef DEBUGGING 861 say("oldchar = '%c', newchar = '%c'\n", 862 pch_char(old), pch_char(new)); 863#endif 864 my_exit(2); 865 } else if (pch_char(new) == '!') { 866 copy_till(where + old - 1, false); 867 if (do_defines) { 868 fputs(not_defined, ofp); 869 def_state = IN_IFNDEF; 870 } 871 while (pch_char(old) == '!') { 872 if (do_defines) { 873 fputs(pfetch(old), ofp); 874 } 875 last_frozen_line++; 876 old++; 877 } 878 if (do_defines) { 879 fputs(else_defined, ofp); 880 def_state = IN_ELSE; 881 } 882 while (pch_char(new) == '!') { 883 fputs(pfetch(new), ofp); 884 new++; 885 } 886 } else { 887 if (pch_char(new) != ' ') 888 fatal("Internal error: expected ' '\n"); 889 old++; 890 new++; 891 if (do_defines && def_state != OUTSIDE) { 892 fputs(end_defined, ofp); 893 def_state = OUTSIDE; 894 } 895 } 896 } 897 if (new <= pat_end && pch_char(new) == '+') { 898 copy_till(where + old - 1, false); 899 if (do_defines) { 900 if (def_state == OUTSIDE) { 901 fputs(if_defined, ofp); 902 def_state = IN_IFDEF; 903 } else if (def_state == IN_IFNDEF) { 904 fputs(else_defined, ofp); 905 def_state = IN_ELSE; 906 } 907 } 908 while (new <= pat_end && pch_char(new) == '+') { 909 fputs(pfetch(new), ofp); 910 new++; 911 } 912 } 913 if (do_defines && def_state != OUTSIDE) { 914 fputs(end_defined, ofp); 915 } 916} 917 918/* 919 * Open the new file. 920 */ 921static void 922init_output(const char *name) 923{ 924 ofp = fopen(name, "w"); 925 if (ofp == NULL) 926 pfatal("can't create %s", name); 927} 928 929/* 930 * Open a file to put hunks we can't locate. 931 */ 932static void 933init_reject(const char *name) 934{ 935 rejfp = fopen(name, "w"); 936 if (rejfp == NULL) 937 pfatal("can't create %s", name); 938} 939 940/* 941 * Copy input file to output, up to wherever hunk is to be applied. 942 * If endoffile is true, treat the last line specially since it may 943 * lack a newline. 944 */ 945static void 946copy_till(LINENUM lastline, bool endoffile) 947{ 948 if (last_frozen_line > lastline) 949 fatal("misordered hunks! output would be garbled\n"); 950 while (last_frozen_line < lastline) { 951 if (++last_frozen_line == lastline && endoffile) 952 dump_line(last_frozen_line, !last_line_missing_eol); 953 else 954 dump_line(last_frozen_line, true); 955 } 956} 957 958/* 959 * Finish copying the input file to the output file. 960 */ 961static void 962spew_output(void) 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 fclose(ofp); 971 ofp = NULL; 972} 973 974/* 975 * Copy one line from input to output. 976 */ 977static void 978dump_line(LINENUM line, bool write_newline) 979{ 980 char *s; 981 982 s = ifetch(line, 0); 983 if (s == NULL) 984 return; 985 /* Note: string is not NUL terminated. */ 986 for (; *s != '\n'; s++) 987 putc(*s, ofp); 988 if (write_newline) 989 putc('\n', ofp); 990} 991 992/* 993 * Does the patch pattern match at line base+offset? 994 */ 995static bool 996patch_match(LINENUM base, LINENUM offset, LINENUM fuzz) 997{ 998 LINENUM pline = 1 + fuzz; 999 LINENUM iline; 1000 LINENUM pat_lines = pch_ptrn_lines() - fuzz; 1001 const char *ilineptr; 1002 const char *plineptr; 1003 short plinelen; 1004 1005 for (iline = base + offset + fuzz; pline <= pat_lines; pline++, iline++) { 1006 ilineptr = ifetch(iline, offset >= 0); 1007 if (ilineptr == NULL) 1008 return false; 1009 plineptr = pfetch(pline); 1010 plinelen = pch_line_len(pline); 1011 if (canonicalize) { 1012 if (!similar(ilineptr, plineptr, plinelen)) 1013 return false; 1014 } else if (strnNE(ilineptr, plineptr, plinelen)) 1015 return false; 1016 if (iline == input_lines) { 1017 /* 1018 * We are looking at the last line of the file. 1019 * If the file has no eol, the patch line should 1020 * not have one either and vice-versa. Note that 1021 * plinelen > 0. 1022 */ 1023 if (last_line_missing_eol) { 1024 if (plineptr[plinelen - 1] == '\n') 1025 return false; 1026 } else { 1027 if (plineptr[plinelen - 1] != '\n') 1028 return false; 1029 } 1030 } 1031 } 1032 return true; 1033} 1034 1035/* 1036 * Do two lines match with canonicalized white space? 1037 */ 1038static bool 1039similar(const char *a, const char *b, int len) 1040{ 1041 while (len) { 1042 if (isspace(*b)) { /* whitespace (or \n) to match? */ 1043 if (!isspace(*a)) /* no corresponding whitespace? */ 1044 return false; 1045 while (len && isspace(*b) && *b != '\n') 1046 b++, len--; /* skip pattern whitespace */ 1047 while (isspace(*a) && *a != '\n') 1048 a++; /* skip target whitespace */ 1049 if (*a == '\n' || *b == '\n') 1050 return (*a == *b); /* should end in sync */ 1051 } else if (*a++ != *b++) /* match non-whitespace chars */ 1052 return false; 1053 else 1054 len--; /* probably not necessary */ 1055 } 1056 return true; /* actually, this is not reached */ 1057 /* since there is always a \n */ 1058} 1059