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 1.7 2007/09/29 23:11:10 swildner 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 if (diff_type == CONTEXT_DIFF 635 || diff_type == NEW_CONTEXT_DIFF 636 || diff_type == UNI_DIFF) { 637 if (fuzz == 0) 638 return (input_lines == 0 ? first_guess : 0); 639 } else 640 return (first_guess); 641 } 642 if (max_neg_offset >= first_guess) /* do not try lines < 0 */ 643 max_neg_offset = first_guess - 1; 644 if (first_guess <= input_lines && patch_match(first_guess, 0, fuzz)) 645 return first_guess; 646 for (offset = 1; ; offset++) { 647 bool check_after = (offset <= max_pos_offset); 648 bool check_before = (offset <= max_neg_offset); 649 650 if (check_after && patch_match(first_guess, offset, fuzz)) { 651 #ifdef DEBUGGING 652 if (debug & 1) 653 say("Offset changing from %ld to %ld\n", 654 last_offset, offset); 655 #endif 656 last_offset = offset; 657 return first_guess + offset; 658 } else if (check_before && 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 && !check_after) 667 return 0; 668 } 669 } 670 671 /* We did not find the pattern, dump out the hunk so they can handle it. */ 672 673 static void 674 abort_context_hunk(void) 675 { 676 LINENUM i; 677 const LINENUM pat_end = pch_end(); 678 /* 679 * add in last_offset to guess the same as the previous successful 680 * hunk 681 */ 682 const LINENUM oldfirst = pch_first() + last_offset; 683 const LINENUM newfirst = pch_newfirst() + last_offset; 684 const LINENUM oldlast = oldfirst + pch_ptrn_lines() - 1; 685 const LINENUM newlast = newfirst + pch_repl_lines() - 1; 686 const char *stars = (diff_type >= NEW_CONTEXT_DIFF ? " ****" : ""); 687 const char *minuses = (diff_type >= NEW_CONTEXT_DIFF ? " ----" : " -----"); 688 689 fprintf(rejfp, "***************\n"); 690 for (i = 0; i <= pat_end; i++) { 691 switch (pch_char(i)) { 692 case '*': 693 if (oldlast < oldfirst) 694 fprintf(rejfp, "*** 0%s\n", stars); 695 else if (oldlast == oldfirst) 696 fprintf(rejfp, "*** %ld%s\n", oldfirst, stars); 697 else 698 fprintf(rejfp, "*** %ld,%ld%s\n", oldfirst, 699 oldlast, stars); 700 break; 701 case '=': 702 if (newlast < newfirst) 703 fprintf(rejfp, "--- 0%s\n", minuses); 704 else if (newlast == newfirst) 705 fprintf(rejfp, "--- %ld%s\n", newfirst, minuses); 706 else 707 fprintf(rejfp, "--- %ld,%ld%s\n", newfirst, 708 newlast, minuses); 709 break; 710 case '\n': 711 fprintf(rejfp, "%s", pfetch(i)); 712 break; 713 case ' ': 714 case '-': 715 case '+': 716 case '!': 717 fprintf(rejfp, "%c %s", pch_char(i), pfetch(i)); 718 break; 719 default: 720 fatal("fatal internal error in abort_context_hunk\n"); 721 } 722 } 723 } 724 725 static void 726 rej_line(int ch, LINENUM i) 727 { 728 size_t len; 729 const char *line = pfetch(i); 730 731 len = strlen(line); 732 733 fprintf(rejfp, "%c%s", ch, line); 734 if (len == 0 || line[len-1] != '\n') 735 fprintf(rejfp, "\n\\ No newline at end of file\n"); 736 } 737 738 static void 739 abort_hunk(void) 740 { 741 LINENUM i, j, split; 742 int ch1, ch2; 743 const LINENUM pat_end = pch_end(); 744 const LINENUM oldfirst = pch_first() + last_offset; 745 const LINENUM newfirst = pch_newfirst() + last_offset; 746 747 if (diff_type != UNI_DIFF) { 748 abort_context_hunk(); 749 return; 750 } 751 split = -1; 752 for (i = 0; i <= pat_end; i++) { 753 if (pch_char(i) == '=') { 754 split = i; 755 break; 756 } 757 } 758 if (split == -1) { 759 fprintf(rejfp, "malformed hunk: no split found\n"); 760 return; 761 } 762 i = 0; 763 j = split + 1; 764 fprintf(rejfp, "@@ -%ld,%ld +%ld,%ld @@\n", 765 pch_ptrn_lines() ? oldfirst : 0, 766 pch_ptrn_lines(), newfirst, pch_repl_lines()); 767 while (i < split || j <= pat_end) { 768 ch1 = i < split ? pch_char(i) : -1; 769 ch2 = j <= pat_end ? pch_char(j) : -1; 770 if (ch1 == '-') { 771 rej_line('-', i); 772 i++; 773 } else if (ch1 == ' ' && ch2 == ' ') { 774 rej_line(' ', i); 775 i++; 776 j++; 777 } else if (ch1 == '!' && ch2 == '!') { 778 while (i < split && ch1 == '!') { 779 rej_line('-', i); 780 i++; 781 ch1 = i < split ? pch_char(i) : -1; 782 } 783 while (j <= pat_end && ch2 == '!') { 784 rej_line('+', j); 785 j++; 786 ch2 = j <= pat_end ? pch_char(j) : -1; 787 } 788 } else if (ch1 == '*') { 789 i++; 790 } else if (ch2 == '+' || ch2 == ' ') { 791 rej_line(ch2, j); 792 j++; 793 } else { 794 fprintf(rejfp, "internal error on (%ld %ld %ld)\n", 795 i, split, j); 796 rej_line(ch1, i); 797 rej_line(ch2, j); 798 return; 799 } 800 } 801 } 802 803 /* We found where to apply it (we hope), so do it. */ 804 805 static void 806 apply_hunk(LINENUM where) 807 { 808 LINENUM old = 1; 809 const LINENUM lastline = pch_ptrn_lines(); 810 LINENUM new = lastline + 1; 811 #define OUTSIDE 0 812 #define IN_IFNDEF 1 813 #define IN_IFDEF 2 814 #define IN_ELSE 3 815 int def_state = OUTSIDE; 816 const LINENUM pat_end = pch_end(); 817 818 where--; 819 while (pch_char(new) == '=' || pch_char(new) == '\n') 820 new++; 821 822 while (old <= lastline) { 823 if (pch_char(old) == '-') { 824 copy_till(where + old - 1, false); 825 if (do_defines) { 826 if (def_state == OUTSIDE) { 827 fputs(not_defined, ofp); 828 def_state = IN_IFNDEF; 829 } else if (def_state == IN_IFDEF) { 830 fputs(else_defined, ofp); 831 def_state = IN_ELSE; 832 } 833 fputs(pfetch(old), ofp); 834 } 835 last_frozen_line++; 836 old++; 837 } else if (new > pat_end) { 838 break; 839 } else if (pch_char(new) == '+') { 840 copy_till(where + old - 1, false); 841 if (do_defines) { 842 if (def_state == IN_IFNDEF) { 843 fputs(else_defined, ofp); 844 def_state = IN_ELSE; 845 } else if (def_state == OUTSIDE) { 846 fputs(if_defined, ofp); 847 def_state = IN_IFDEF; 848 } 849 } 850 fputs(pfetch(new), ofp); 851 new++; 852 } else if (pch_char(new) != pch_char(old)) { 853 say("Out-of-sync patch, lines %ld,%ld--mangled text or line numbers, maybe?\n", 854 pch_hunk_beg() + old, 855 pch_hunk_beg() + new); 856 #ifdef DEBUGGING 857 say("oldchar = '%c', newchar = '%c'\n", 858 pch_char(old), pch_char(new)); 859 #endif 860 my_exit(2); 861 } else if (pch_char(new) == '!') { 862 copy_till(where + old - 1, false); 863 if (do_defines) { 864 fputs(not_defined, ofp); 865 def_state = IN_IFNDEF; 866 } 867 while (pch_char(old) == '!') { 868 if (do_defines) { 869 fputs(pfetch(old), ofp); 870 } 871 last_frozen_line++; 872 old++; 873 } 874 if (do_defines) { 875 fputs(else_defined, ofp); 876 def_state = IN_ELSE; 877 } 878 while (pch_char(new) == '!') { 879 fputs(pfetch(new), ofp); 880 new++; 881 } 882 } else { 883 if (pch_char(new) != ' ') 884 fatal("Internal error: expected ' '\n"); 885 old++; 886 new++; 887 if (do_defines && def_state != OUTSIDE) { 888 fputs(end_defined, ofp); 889 def_state = OUTSIDE; 890 } 891 } 892 } 893 if (new <= pat_end && pch_char(new) == '+') { 894 copy_till(where + old - 1, false); 895 if (do_defines) { 896 if (def_state == OUTSIDE) { 897 fputs(if_defined, ofp); 898 def_state = IN_IFDEF; 899 } else if (def_state == IN_IFNDEF) { 900 fputs(else_defined, ofp); 901 def_state = IN_ELSE; 902 } 903 } 904 while (new <= pat_end && pch_char(new) == '+') { 905 fputs(pfetch(new), ofp); 906 new++; 907 } 908 } 909 if (do_defines && def_state != OUTSIDE) { 910 fputs(end_defined, ofp); 911 } 912 } 913 914 /* 915 * Open the new file. 916 */ 917 static void 918 init_output(const char *name) 919 { 920 ofp = fopen(name, "w"); 921 if (ofp == NULL) 922 pfatal("can't create %s", name); 923 } 924 925 /* 926 * Open a file to put hunks we can't locate. 927 */ 928 static void 929 init_reject(const char *name) 930 { 931 rejfp = fopen(name, "w"); 932 if (rejfp == NULL) 933 pfatal("can't create %s", name); 934 } 935 936 /* 937 * Copy input file to output, up to wherever hunk is to be applied. 938 * If endoffile is true, treat the last line specially since it may 939 * lack a newline. 940 */ 941 static void 942 copy_till(LINENUM lastline, bool endoffile) 943 { 944 if (last_frozen_line > lastline) 945 fatal("misordered hunks! output would be garbled\n"); 946 while (last_frozen_line < lastline) { 947 if (++last_frozen_line == lastline && endoffile) 948 dump_line(last_frozen_line, !last_line_missing_eol); 949 else 950 dump_line(last_frozen_line, true); 951 } 952 } 953 954 /* 955 * Finish copying the input file to the output file. 956 */ 957 static void 958 spew_output(void) 959 { 960 #ifdef DEBUGGING 961 if (debug & 256) 962 say("il=%ld lfl=%ld\n", input_lines, last_frozen_line); 963 #endif 964 if (input_lines) 965 copy_till(input_lines, true); /* dump remainder of file */ 966 fclose(ofp); 967 ofp = NULL; 968 } 969 970 /* 971 * Copy one line from input to output. 972 */ 973 static void 974 dump_line(LINENUM line, bool write_newline) 975 { 976 char *s; 977 978 s = ifetch(line, 0); 979 if (s == NULL) 980 return; 981 /* Note: string is not NUL terminated. */ 982 for (; *s != '\n'; s++) 983 putc(*s, ofp); 984 if (write_newline) 985 putc('\n', ofp); 986 } 987 988 /* 989 * Does the patch pattern match at line base+offset? 990 */ 991 static bool 992 patch_match(LINENUM base, LINENUM offset, LINENUM fuzz) 993 { 994 LINENUM pline = 1 + fuzz; 995 LINENUM iline; 996 LINENUM pat_lines = pch_ptrn_lines() - fuzz; 997 const char *ilineptr; 998 const char *plineptr; 999 short plinelen; 1000 1001 for (iline = base + offset + fuzz; pline <= pat_lines; pline++, iline++) { 1002 ilineptr = ifetch(iline, offset >= 0); 1003 if (ilineptr == NULL) 1004 return false; 1005 plineptr = pfetch(pline); 1006 plinelen = pch_line_len(pline); 1007 if (canonicalize) { 1008 if (!similar(ilineptr, plineptr, plinelen)) 1009 return false; 1010 } else if (strnNE(ilineptr, plineptr, plinelen)) 1011 return false; 1012 if (iline == input_lines) { 1013 /* 1014 * We are looking at the last line of the file. 1015 * If the file has no eol, the patch line should 1016 * not have one either and vice-versa. Note that 1017 * plinelen > 0. 1018 */ 1019 if (last_line_missing_eol) { 1020 if (plineptr[plinelen - 1] == '\n') 1021 return false; 1022 } else { 1023 if (plineptr[plinelen - 1] != '\n') 1024 return false; 1025 } 1026 } 1027 } 1028 return true; 1029 } 1030 1031 /* 1032 * Do two lines match with canonicalized white space? 1033 */ 1034 static bool 1035 similar(const char *a, const char *b, int len) 1036 { 1037 while (len) { 1038 if (isspace((unsigned char)*b)) { /* whitespace (or \n) to match? */ 1039 if (!isspace((unsigned char)*a)) /* no corresponding whitespace? */ 1040 return false; 1041 while (len && isspace((unsigned char)*b) && *b != '\n') 1042 b++, len--; /* skip pattern whitespace */ 1043 while (isspace((unsigned char)*a) && *a != '\n') 1044 a++; /* skip target whitespace */ 1045 if (*a == '\n' || *b == '\n') 1046 return (*a == *b); /* should end in sync */ 1047 } else if (*a++ != *b++) /* match non-whitespace chars */ 1048 return false; 1049 else 1050 len--; /* probably not necessary */ 1051 } 1052 return true; /* actually, this is not reached */ 1053 /* since there is always a \n */ 1054 } 1055