usr.bin/patch/patch.c

   1 /*-
   2  * Copyright 1986, Larry Wall
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following condition is met:
   6  * 1. Redistributions of source code must retain the above copyright notice,
   7  * this condition and the following disclaimer.
   8  *
   9  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY
  10  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  11  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  12  * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
  13  * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  14  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  15  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  16  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  17  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  18  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  19  * SUCH DAMAGE.
  20  *
  21  * patch - a program to apply diffs to original files
  22  *
  23  * -C option added in 1998, original code by Marc Espie, based on FreeBSD
  24  * behaviour
  25  *
  26  * $OpenBSD: patch.c,v 1.54 2014/12/13 10:31:07 tobias Exp $
  27  * $FreeBSD$
  28  *
  29  */
  30
  31 #include <sys/types.h>
  32 #include <sys/stat.h>
  33
  34 #include <assert.h>
  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;                   /* general purpose buffer */
  53 size_t          buf_size;               /* size of the general purpose buffer */
  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 bool            nonempty_patchf_seen = false;   /* seen nonempty patch file? */
  58
  59 #define MAXFILEC 2
  60
  61 char            *filearg[MAXFILEC];
  62 bool            ok_to_create_file = false;
  63 char            *outname = NULL;
  64 char            *origprae = NULL;
  65 char            *TMPOUTNAME;
  66 char            *TMPINNAME;
  67 char            *TMPREJNAME;
  68 char            *TMPPATNAME;
  69 bool            toutkeep = false;
  70 bool            trejkeep = false;
  71 bool            warn_on_invalid_line;
  72 bool            last_line_missing_eol;
  73
  74 #ifdef DEBUGGING
  75 int             debug = 0;
  76 #endif
  77
  78 bool            force = false;
  79 bool            batch = false;
  80 bool            verbose = true;
  81 bool            reverse = false;
  82 bool            noreverse = false;
  83 bool            skip_rest_of_patch = false;
  84 int             strippath = 957;
  85 bool            canonicalize = false;
  86 bool            check_only = false;
  87 int             diff_type = 0;
  88 char            *revision = NULL;       /* prerequisite revision, if any */
  89 LINENUM         input_lines = 0;        /* how long is input file in lines */
  90 int             posix = 0;              /* strict POSIX mode? */
  91
  92 static void     reinitialize_almost_everything(void);
  93 static void     get_some_switches(void);
  94 static LINENUM  locate_hunk(LINENUM);
  95 static void     abort_context_hunk(void);
  96 static void     rej_line(int, LINENUM);
  97 static void     abort_hunk(void);
  98 static void     apply_hunk(LINENUM);
  99 static void     init_output(const char *);
 100 static void     init_reject(const char *);
 101 static void     copy_till(LINENUM, bool);
 102 static bool     spew_output(void);
 103 static void     dump_line(LINENUM, bool);
 104 static bool     patch_match(LINENUM, LINENUM, LINENUM);
 105 static bool     similar(const char *, const char *, int);
 106 static void     usage(void);
 107 static bool     handle_creation(bool, bool *);
 108
 109 /* true if -E was specified on command line.  */
 110 static bool     remove_empty_files = false;
 111
 112 /* true if -R was specified on command line.  */
 113 static bool     reverse_flag_specified = false;
 114
 115 static bool     Vflag = false;
 116
 117 /* buffer holding the name of the rejected patch file. */
 118 static char     rejname[PATH_MAX];
 119
 120 /* how many input lines have been irretractibly output */
 121 static LINENUM  last_frozen_line = 0;
 122
 123 static int      Argc;           /* guess */
 124 static char     **Argv;
 125 static int      Argc_last;      /* for restarting plan_b */
 126 static char     **Argv_last;
 127
 128 static FILE     *ofp = NULL;    /* output file pointer */
 129 static FILE     *rejfp = NULL;  /* reject file pointer */
 130
 131 static int      filec = 0;      /* how many file arguments? */
 132 static LINENUM  last_offset = 0;
 133 static LINENUM  maxfuzz = 2;
 134
 135 /* patch using ifdef, ifndef, etc. */
 136 static bool             do_defines = false;
 137 /* #ifdef xyzzy */
 138 static char             if_defined[128];
 139 /* #ifndef xyzzy */
 140 static char             not_defined[128];
 141 /* #else */
 142 static const char       else_defined[] = "#else\n";
 143 /* #endif xyzzy */
 144 static char             end_defined[128];
 145
 146
 147 /* Apply a set of diffs as appropriate. */
 148
 149 int
 150 main(int argc, char *argv[])
 151 {
 152         struct stat statbuf;
 153         int     error = 0, hunk, failed, i, fd;
 154         bool    out_creating, out_existed, patch_seen, remove_file;
 155         bool    reverse_seen;
 156         LINENUM where = 0, newwhere, fuzz, mymaxfuzz;
 157         const   char *tmpdir;
 158         char    *v;
 159
 160         setvbuf(stdout, NULL, _IOLBF, 0);
 161         setvbuf(stderr, NULL, _IOLBF, 0);
 162         for (i = 0; i < MAXFILEC; i++)
 163                 filearg[i] = NULL;
 164
 165         buf_size = INITLINELEN;
 166         buf = malloc((unsigned)(buf_size));
 167         if (buf == NULL)
 168                 fatal("out of memory\n");
 169
 170         /* Cons up the names of the temporary files.  */
 171         if ((tmpdir = getenv("TMPDIR")) == NULL || *tmpdir == '\0')
 172                 tmpdir = _PATH_TMP;
 173         for (i = strlen(tmpdir) - 1; i > 0 && tmpdir[i] == '/'; i--)
 174                 ;
 175         i++;
 176         if (asprintf(&TMPOUTNAME, "%.*s/patchoXXXXXXXXXX", i, tmpdir) == -1)
 177                 fatal("cannot allocate memory");
 178         if ((fd = mkstemp(TMPOUTNAME)) < 0)
 179                 pfatal("can't create %s", TMPOUTNAME);
 180         close(fd);
 181
 182         if (asprintf(&TMPINNAME, "%.*s/patchiXXXXXXXXXX", i, tmpdir) == -1)
 183                 fatal("cannot allocate memory");
 184         if ((fd = mkstemp(TMPINNAME)) < 0)
 185                 pfatal("can't create %s", TMPINNAME);
 186         close(fd);
 187
 188         if (asprintf(&TMPREJNAME, "%.*s/patchrXXXXXXXXXX", i, tmpdir) == -1)
 189                 fatal("cannot allocate memory");
 190         if ((fd = mkstemp(TMPREJNAME)) < 0)
 191                 pfatal("can't create %s", TMPREJNAME);
 192         close(fd);
 193
 194         if (asprintf(&TMPPATNAME, "%.*s/patchpXXXXXXXXXX", i, tmpdir) == -1)
 195                 fatal("cannot allocate memory");
 196         if ((fd = mkstemp(TMPPATNAME)) < 0)
 197                 pfatal("can't create %s", TMPPATNAME);
 198         close(fd);
 199
 200         v = getenv("SIMPLE_BACKUP_SUFFIX");
 201         if (v)
 202                 simple_backup_suffix = v;
 203         else
 204                 simple_backup_suffix = ORIGEXT;
 205
 206         /* parse switches */
 207         Argc = argc;
 208         Argv = argv;
 209         get_some_switches();
 210
 211         if (!Vflag) {
 212                 if ((v = getenv("PATCH_VERSION_CONTROL")) == NULL)
 213                         v = getenv("VERSION_CONTROL");
 214                 if (v != NULL || !posix)
 215                         backup_type = get_version(v);   /* OK to pass NULL. */
 216         }
 217
 218         /* make sure we clean up /tmp in case of disaster */
 219         set_signals(0);
 220
 221         patch_seen = false;
 222         for (open_patch_file(filearg[1]); there_is_another_patch();
 223             reinitialize_almost_everything()) {
 224                 /* for each patch in patch file */
 225
 226                 if (source_file != NULL && (diff_type == CONTEXT_DIFF ||
 227                     diff_type == NEW_CONTEXT_DIFF ||
 228                     diff_type == UNI_DIFF))
 229                         out_creating = strcmp(source_file, _PATH_DEVNULL) == 0;
 230                 else
 231                         out_creating = false;
 232                 patch_seen = true;
 233
 234                 warn_on_invalid_line = true;
 235
 236                 if (outname == NULL)
 237                         outname = xstrdup(filearg[0]);
 238
 239                 /*
 240                  * At this point, we know if we're supposed to be creating the
 241                  * file and we know if we should be trying to handle a conflict
 242                  * between the patch and the file already existing.  We defer
 243                  * handling it until hunk processing because we want to swap
 244                  * the hunk if they opt to reverse it, but we want to make sure
 245                  * we *can* swap the hunk without running into memory issues
 246                  * before we offer it.  We also want to be verbose if flags or
 247                  * user decision cause us to skip -- this is explained a little
 248                  * more later.
 249                  */
 250                 out_existed = stat(outname, &statbuf) == 0;
 251
 252                 /* for ed script just up and do it and exit */
 253                 if (diff_type == ED_DIFF) {
 254                         do_ed_script();
 255                         continue;
 256                 }
 257                 /* initialize the patched file */
 258                 if (!skip_rest_of_patch)
 259                         init_output(TMPOUTNAME);
 260
 261                 /* initialize reject file */
 262                 init_reject(TMPREJNAME);
 263
 264                 /* find out where all the lines are */
 265                 if (!skip_rest_of_patch)
 266                         scan_input(filearg[0]);
 267
 268                 /*
 269                  * from here on, open no standard i/o files, because
 270                  * malloc might misfire and we can't catch it easily
 271                  */
 272
 273                 /* apply each hunk of patch */
 274                 hunk = 0;
 275                 failed = 0;
 276                 reverse_seen = false;
 277                 out_of_mem = false;
 278                 remove_file = false;
 279                 while (another_hunk()) {
 280                         assert(!out_creating || hunk == 0);
 281                         hunk++;
 282                         fuzz = 0;
 283
 284                         /*
 285                          * There are only three cases in handle_creation() that
 286                          * results in us skipping hunk location, in order:
 287                          *
 288                          * 1.) Potentially reversed but -f/--force'd,
 289                          * 2.) Potentially reversed but -N/--forward'd
 290                          * 3.) Reversed and the user's opted to not apply it.
 291                          *
 292                          * In all three cases, we still want to inform the user
 293                          * that we're ignoring it in the standard way, which is
 294                          * also tied to this hunk processing loop.
 295                          */
 296                         if (out_creating)
 297                                 reverse_seen = handle_creation(out_existed,
 298                                     &remove_file);
 299
 300                         mymaxfuzz = pch_context();
 301                         if (maxfuzz < mymaxfuzz)
 302                                 mymaxfuzz = maxfuzz;
 303                         if (!skip_rest_of_patch) {
 304                                 do {
 305                                         where = locate_hunk(fuzz);
 306                                         if (hunk == 1 && where == 0 && !force && !reverse_seen) {
 307                                                 /* dwim for reversed patch? */
 308                                                 if (!pch_swap()) {
 309                                                         if (fuzz == 0)
 310                                                                 say("Not enough memory to try swapped hunk!  Assuming unswapped.\n");
 311                                                         continue;
 312                                                 }
 313                                                 reverse = !reverse;
 314                                                 /* try again */
 315                                                 where = locate_hunk(fuzz);
 316                                                 if (where == 0) {
 317                                                         /* didn't find it swapped */
 318                                                         if (!pch_swap())
 319                                                                 /* put it back to normal */
 320                                                                 fatal("lost hunk on alloc error!\n");
 321                                                         reverse = !reverse;
 322                                                 } else if (noreverse) {
 323                                                         if (!pch_swap())
 324                                                                 /* put it back to normal */
 325                                                                 fatal("lost hunk on alloc error!\n");
 326                                                         reverse = !reverse;
 327                                                         say("Ignoring previously applied (or reversed) patch.\n");
 328                                                         skip_rest_of_patch = true;
 329                                                 } else if (batch) {
 330                                                         if (verbose)
 331                                                                 say("%seversed (or previously applied) patch detected!  %s -R.",
 332                                                                     reverse ? "R" : "Unr",
 333                                                                     reverse ? "Assuming" : "Ignoring");
 334                                                 } else {
 335                                                         ask("%seversed (or previously applied) patch detected!  %s -R? [y] ",
 336                                                             reverse ? "R" : "Unr",
 337                                                             reverse ? "Assume" : "Ignore");
 338                                                         if (*buf == 'n') {
 339                                                                 ask("Apply anyway? [n] ");
 340                                                                 if (*buf != 'y')
 341                                                                         skip_rest_of_patch = true;
 342                                                                 else
 343                                                                         reverse_seen = true;
 344                                                                 where = 0;
 345                                                                 reverse = !reverse;
 346                                                                 if (!pch_swap())
 347                                                                         /* put it back to normal */
 348                                                                         fatal("lost hunk on alloc error!\n");
 349                                                         }
 350                                                 }
 351                                         }
 352                                 } while (!skip_rest_of_patch && where == 0 &&
 353                                     ++fuzz <= mymaxfuzz);
 354
 355                                 if (skip_rest_of_patch) {       /* just got decided */
 356                                         if (ferror(ofp) || fclose(ofp)) {
 357                                                 say("Error writing %s\n",
 358                                                     TMPOUTNAME);
 359                                                 error = 1;
 360                                         }
 361                                         ofp = NULL;
 362                                 }
 363                         }
 364                         newwhere = pch_newfirst() + last_offset;
 365                         if (skip_rest_of_patch) {
 366                                 abort_hunk();
 367                                 failed++;
 368                                 if (verbose)
 369                                         say("Hunk #%d ignored at %ld.\n",
 370                                             hunk, newwhere);
 371                         } else if (where == 0) {
 372                                 abort_hunk();
 373                                 failed++;
 374                                 if (verbose)
 375                                         say("Hunk #%d failed at %ld.\n",
 376                                             hunk, newwhere);
 377                         } else {
 378                                 apply_hunk(where);
 379                                 if (verbose) {
 380                                         say("Hunk #%d succeeded at %ld",
 381                                             hunk, newwhere);
 382                                         if (fuzz != 0)
 383                                                 say(" with fuzz %ld", fuzz);
 384                                         if (last_offset)
 385                                                 say(" (offset %ld line%s)",
 386                                                     last_offset,
 387                                                     last_offset == 1L ? "" : "s");
 388                                         say(".\n");
 389                                 }
 390                         }
 391                 }
 392
 393                 if (out_of_mem && using_plan_a) {
 394                         Argc = Argc_last;
 395                         Argv = Argv_last;
 396                         say("\n\nRan out of memory using Plan A--trying again...\n\n");
 397                         if (ofp)
 398                                 fclose(ofp);
 399                         ofp = NULL;
 400                         if (rejfp)
 401                                 fclose(rejfp);
 402                         rejfp = NULL;
 403                         continue;
 404                 }
 405                 if (hunk == 0)
 406                         fatal("Internal error: hunk should not be 0\n");
 407
 408                 /* finish spewing out the new file */
 409                 if (!skip_rest_of_patch && !spew_output()) {
 410                         say("Can't write %s\n", TMPOUTNAME);
 411                         error = 1;
 412                 }
 413
 414                 /* and put the output where desired */
 415                 ignore_signals();
 416                 if (!skip_rest_of_patch) {
 417                         char    *realout = outname;
 418
 419                         if (!check_only) {
 420                                 if (move_file(TMPOUTNAME, outname) < 0) {
 421                                         toutkeep = true;
 422                                         realout = TMPOUTNAME;
 423                                         chmod(TMPOUTNAME, filemode);
 424                                 } else
 425                                         chmod(outname, filemode);
 426
 427                                 /*
 428                                  * remove_file is a per-patch flag indicating
 429                                  * whether it's OK to remove the empty file.
 430                                  * This is specifically set when we're reversing
 431                                  * the creation of a file and it ends up empty.
 432                                  * This is an exception to the global policy
 433                                  * (remove_empty_files) because the user would
 434                                  * likely not expect the reverse of file
 435                                  * creation to leave an empty file laying
 436                                  * around.
 437                                  */
 438                                 if ((remove_empty_files || remove_file) &&
 439                                     stat(realout, &statbuf) == 0 &&
 440                                     statbuf.st_size == 0) {
 441                                         if (verbose)
 442                                                 say("Removing %s (empty after patching).\n",
 443                                                     realout);
 444                                         unlink(realout);
 445                                 }
 446                         }
 447                 }
 448                 if (ferror(rejfp) || fclose(rejfp)) {
 449                         say("Error writing %s\n", rejname);
 450                         error = 1;
 451                 }
 452                 rejfp = NULL;
 453                 if (failed) {
 454                         error = 1;
 455                         if (*rejname == '\0') {
 456                                 if (strlcpy(rejname, outname,
 457                                     sizeof(rejname)) >= sizeof(rejname))
 458                                         fatal("filename %s is too long\n", outname);
 459                                 if (strlcat(rejname, REJEXT,
 460                                     sizeof(rejname)) >= sizeof(rejname))
 461                                         fatal("filename %s is too long\n", outname);
 462                         }
 463                         if (!check_only)
 464                                 say("%d out of %d hunks %s--saving rejects to %s\n",
 465                                     failed, hunk, skip_rest_of_patch ? "ignored" : "failed", rejname);
 466                         else
 467                                 say("%d out of %d hunks %s while patching %s\n",
 468                                     failed, hunk, skip_rest_of_patch ? "ignored" : "failed", filearg[0]);
 469                         if (!check_only && move_file(TMPREJNAME, rejname) < 0)
 470                                 trejkeep = true;
 471                 }
 472                 set_signals(1);
 473         }
 474
 475         if (!patch_seen && nonempty_patchf_seen)
 476                 error = 2;
 477
 478         my_exit(error);
 479         /* NOTREACHED */
 480 }
 481
 482 /* Prepare to find the next patch to do in the patch file. */
 483
 484 static void
 485 reinitialize_almost_everything(void)
 486 {
 487         re_patch();
 488         re_input();
 489
 490         input_lines = 0;
 491         last_frozen_line = 0;
 492
 493         filec = 0;
 494         if (!out_of_mem) {
 495                 free(filearg[0]);
 496                 filearg[0] = NULL;
 497         }
 498
 499         free(source_file);
 500         source_file = NULL;
 501
 502         free(outname);
 503         outname = NULL;
 504
 505         last_offset = 0;
 506         diff_type = 0;
 507
 508         free(revision);
 509         revision = NULL;
 510
 511         reverse = reverse_flag_specified;
 512         skip_rest_of_patch = false;
 513
 514         get_some_switches();
 515 }
 516
 517 /* Process switches and filenames. */
 518
 519 static void
 520 get_some_switches(void)
 521 {
 522         const char *options = "b::B:cCd:D:eEfF:i:lnNo:p:r:RstuvV:x:z:";
 523         static struct option longopts[] = {
 524                 {"backup",              no_argument,            0,      'b'},
 525                 {"batch",               no_argument,            0,      't'},
 526                 {"check",               no_argument,            0,      'C'},
 527                 {"context",             no_argument,            0,      'c'},
 528                 {"debug",               required_argument,      0,      'x'},
 529                 {"directory",           required_argument,      0,      'd'},
 530                 {"dry-run",             no_argument,            0,      'C'},
 531                 {"ed",                  no_argument,            0,      'e'},
 532                 {"force",               no_argument,            0,      'f'},
 533                 {"forward",             no_argument,            0,      'N'},
 534                 {"fuzz",                required_argument,      0,      'F'},
 535                 {"ifdef",               required_argument,      0,      'D'},
 536                 {"input",               required_argument,      0,      'i'},
 537                 {"ignore-whitespace",   no_argument,            0,      'l'},
 538                 {"normal",              no_argument,            0,      'n'},
 539                 {"output",              required_argument,      0,      'o'},
 540                 {"prefix",              required_argument,      0,      'B'},
 541                 {"quiet",               no_argument,            0,      's'},
 542                 {"reject-file",         required_argument,      0,      'r'},
 543                 {"remove-empty-files",  no_argument,            0,      'E'},
 544                 {"reverse",             no_argument,            0,      'R'},
 545                 {"silent",              no_argument,            0,      's'},
 546                 {"strip",               required_argument,      0,      'p'},
 547                 {"suffix",              required_argument,      0,      'z'},
 548                 {"unified",             no_argument,            0,      'u'},
 549                 {"version",             no_argument,            0,      'v'},
 550                 {"version-control",     required_argument,      0,      'V'},
 551                 {"posix",               no_argument,            &posix, 1},
 552                 {NULL,                  0,                      0,      0}
 553         };
 554         int ch;
 555
 556         rejname[0] = '\0';
 557         Argc_last = Argc;
 558         Argv_last = Argv;
 559         if (!Argc)
 560                 return;
 561         optreset = optind = 1;
 562         while ((ch = getopt_long(Argc, Argv, options, longopts, NULL)) != -1) {
 563                 switch (ch) {
 564                 case 'b':
 565                         if (backup_type == none)
 566                                 backup_type = numbered_existing;
 567                         if (optarg == NULL)
 568                                 break;
 569                         if (verbose)
 570                                 say("Warning, the ``-b suffix'' option has been"
 571                                     " obsoleted by the -z option.\n");
 572                         /* FALLTHROUGH */
 573                 case 'z':
 574                         /* must directly follow 'b' case for backwards compat */
 575                         simple_backup_suffix = xstrdup(optarg);
 576                         break;
 577                 case 'B':
 578                         origprae = xstrdup(optarg);
 579                         break;
 580                 case 'c':
 581                         diff_type = CONTEXT_DIFF;
 582                         break;
 583                 case 'C':
 584                         check_only = true;
 585                         break;
 586                 case 'd':
 587                         if (chdir(optarg) < 0)
 588                                 pfatal("can't cd to %s", optarg);
 589                         break;
 590                 case 'D':
 591                         do_defines = true;
 592                         if (!isalpha((unsigned char)*optarg) && *optarg != '_')
 593                                 fatal("argument to -D is not an identifier\n");
 594                         snprintf(if_defined, sizeof if_defined,
 595                             "#ifdef %s\n", optarg);
 596                         snprintf(not_defined, sizeof not_defined,
 597                             "#ifndef %s\n", optarg);
 598                         snprintf(end_defined, sizeof end_defined,
 599                             "#endif /* %s */\n", optarg);
 600                         break;
 601                 case 'e':
 602                         diff_type = ED_DIFF;
 603                         break;
 604                 case 'E':
 605                         remove_empty_files = true;
 606                         break;
 607                 case 'f':
 608                         force = true;
 609                         break;
 610                 case 'F':
 611                         maxfuzz = atoi(optarg);
 612                         break;
 613                 case 'i':
 614                         if (++filec == MAXFILEC)
 615                                 fatal("too many file arguments\n");
 616                         filearg[filec] = xstrdup(optarg);
 617                         break;
 618                 case 'l':
 619                         canonicalize = true;
 620                         break;
 621                 case 'n':
 622                         diff_type = NORMAL_DIFF;
 623                         break;
 624                 case 'N':
 625                         noreverse = true;
 626                         break;
 627                 case 'o':
 628                         outname = xstrdup(optarg);
 629                         break;
 630                 case 'p':
 631                         strippath = atoi(optarg);
 632                         break;
 633                 case 'r':
 634                         if (strlcpy(rejname, optarg,
 635                             sizeof(rejname)) >= sizeof(rejname))
 636                                 fatal("argument for -r is too long\n");
 637                         break;
 638                 case 'R':
 639                         reverse = true;
 640                         reverse_flag_specified = true;
 641                         break;
 642                 case 's':
 643                         verbose = false;
 644                         break;
 645                 case 't':
 646                         batch = true;
 647                         break;
 648                 case 'u':
 649                         diff_type = UNI_DIFF;
 650                         break;
 651                 case 'v':
 652                         version();
 653                         break;
 654                 case 'V':
 655                         backup_type = get_version(optarg);
 656                         Vflag = true;
 657                         break;
 658 #ifdef DEBUGGING
 659                 case 'x':
 660                         debug = atoi(optarg);
 661                         break;
 662 #endif
 663                 default:
 664                         if (ch != '\0')
 665                                 usage();
 666                         break;
 667                 }
 668         }
 669         Argc -= optind;
 670         Argv += optind;
 671
 672         if (Argc > 0) {
 673                 filearg[0] = xstrdup(*Argv++);
 674                 Argc--;
 675                 while (Argc > 0) {
 676                         if (++filec == MAXFILEC)
 677                                 fatal("too many file arguments\n");
 678                         filearg[filec] = xstrdup(*Argv++);
 679                         Argc--;
 680                 }
 681         }
 682
 683         if (getenv("POSIXLY_CORRECT") != NULL)
 684                 posix = 1;
 685 }
 686
 687 static void
 688 usage(void)
 689 {
 690         fprintf(stderr,
 691 "usage: patch [-bCcEeflNnRstuv] [-B backup-prefix] [-D symbol] [-d directory]\n"
 692 "             [-F max-fuzz] [-i patchfile] [-o out-file] [-p strip-count]\n"
 693 "             [-r rej-name] [-V t | nil | never | none] [-x number]\n"
 694 "             [-z backup-ext] [--posix] [origfile [patchfile]]\n"
 695 "       patch <patchfile\n");
 696         my_exit(EXIT_FAILURE);
 697 }
 698
 699 /*
 700  * Attempt to find the right place to apply this hunk of patch.
 701  */
 702 static LINENUM
 703 locate_hunk(LINENUM fuzz)
 704 {
 705         LINENUM first_guess = pch_first() + last_offset;
 706         LINENUM offset;
 707         LINENUM pat_lines = pch_ptrn_lines();
 708         LINENUM max_pos_offset = input_lines - first_guess - pat_lines + 1;
 709         LINENUM max_neg_offset = first_guess - last_frozen_line - 1 + pch_context();
 710
 711         if (pat_lines == 0) {           /* null range matches always */
 712                 if (verbose && fuzz == 0 && (diff_type == CONTEXT_DIFF
 713                     || diff_type == NEW_CONTEXT_DIFF
 714                     || diff_type == UNI_DIFF)) {
 715                         say("Empty context always matches.\n");
 716                 }
 717                 return (first_guess);
 718         }
 719         if (max_neg_offset >= first_guess)      /* do not try lines < 0 */
 720                 max_neg_offset = first_guess - 1;
 721         if (first_guess <= input_lines && patch_match(first_guess, 0, fuzz))
 722                 return first_guess;
 723         for (offset = 1; ; offset++) {
 724                 bool    check_after = (offset <= max_pos_offset);
 725                 bool    check_before = (offset <= max_neg_offset);
 726
 727                 if (check_after && patch_match(first_guess, offset, fuzz)) {
 728 #ifdef DEBUGGING
 729                         if (debug & 1)
 730                                 say("Offset changing from %ld to %ld\n",
 731                                     last_offset, offset);
 732 #endif
 733                         last_offset = offset;
 734                         return first_guess + offset;
 735                 } else if (check_before && patch_match(first_guess, -offset, fuzz)) {
 736 #ifdef DEBUGGING
 737                         if (debug & 1)
 738                                 say("Offset changing from %ld to %ld\n",
 739                                     last_offset, -offset);
 740 #endif
 741                         last_offset = -offset;
 742                         return first_guess - offset;
 743                 } else if (!check_before && !check_after)
 744                         return 0;
 745         }
 746 }
 747
 748 /* We did not find the pattern, dump out the hunk so they can handle it. */
 749
 750 static void
 751 abort_context_hunk(void)
 752 {
 753         LINENUM i;
 754         const LINENUM   pat_end = pch_end();
 755         /*
 756          * add in last_offset to guess the same as the previous successful
 757          * hunk
 758          */
 759         const LINENUM   oldfirst = pch_first() + last_offset;
 760         const LINENUM   newfirst = pch_newfirst() + last_offset;
 761         const LINENUM   oldlast = oldfirst + pch_ptrn_lines() - 1;
 762         const LINENUM   newlast = newfirst + pch_repl_lines() - 1;
 763         const char      *stars = (diff_type >= NEW_CONTEXT_DIFF ? " ****" : "");
 764         const char      *minuses = (diff_type >= NEW_CONTEXT_DIFF ? " ----" : " -----");
 765
 766         fprintf(rejfp, "***************\n");
 767         for (i = 0; i <= pat_end; i++) {
 768                 switch (pch_char(i)) {
 769                 case '*':
 770                         if (oldlast < oldfirst)
 771                                 fprintf(rejfp, "*** 0%s\n", stars);
 772                         else if (oldlast == oldfirst)
 773                                 fprintf(rejfp, "*** %ld%s\n", oldfirst, stars);
 774                         else
 775                                 fprintf(rejfp, "*** %ld,%ld%s\n", oldfirst,
 776                                     oldlast, stars);
 777                         break;
 778                 case '=':
 779                         if (newlast < newfirst)
 780                                 fprintf(rejfp, "--- 0%s\n", minuses);
 781                         else if (newlast == newfirst)
 782                                 fprintf(rejfp, "--- %ld%s\n", newfirst, minuses);
 783                         else
 784                                 fprintf(rejfp, "--- %ld,%ld%s\n", newfirst,
 785                                     newlast, minuses);
 786                         break;
 787                 case '\n':
 788                         fprintf(rejfp, "%s", pfetch(i));
 789                         break;
 790                 case ' ':
 791                 case '-':
 792                 case '+':
 793                 case '!':
 794                         fprintf(rejfp, "%c %s", pch_char(i), pfetch(i));
 795                         break;
 796                 default:
 797                         fatal("fatal internal error in abort_context_hunk\n");
 798                 }
 799         }
 800 }
 801
 802 static void
 803 rej_line(int ch, LINENUM i)
 804 {
 805         size_t len;
 806         const char *line = pfetch(i);
 807
 808         len = strlen(line);
 809
 810         fprintf(rejfp, "%c%s", ch, line);
 811         if (len == 0 || line[len - 1] != '\n') {
 812                 if (len >= USHRT_MAX)
 813                         fprintf(rejfp, "\n\\ Line too long\n");
 814                 else
 815                         fprintf(rejfp, "\n\\ No newline at end of line\n");
 816         }
 817 }
 818
 819 static void
 820 abort_hunk(void)
 821 {
 822         LINENUM         i, j, split;
 823         int             ch1, ch2;
 824         const LINENUM   pat_end = pch_end();
 825         const LINENUM   oldfirst = pch_first() + last_offset;
 826         const LINENUM   newfirst = pch_newfirst() + last_offset;
 827
 828         if (diff_type != UNI_DIFF) {
 829                 abort_context_hunk();
 830                 return;
 831         }
 832         split = -1;
 833         for (i = 0; i <= pat_end; i++) {
 834                 if (pch_char(i) == '=') {
 835                         split = i;
 836                         break;
 837                 }
 838         }
 839         if (split == -1) {
 840                 fprintf(rejfp, "malformed hunk: no split found\n");
 841                 return;
 842         }
 843         i = 0;
 844         j = split + 1;
 845         fprintf(rejfp, "@@ -%ld,%ld +%ld,%ld @@\n",
 846             pch_ptrn_lines() ? oldfirst : 0,
 847             pch_ptrn_lines(), newfirst, pch_repl_lines());
 848         while (i < split || j <= pat_end) {
 849                 ch1 = i < split ? pch_char(i) : -1;
 850                 ch2 = j <= pat_end ? pch_char(j) : -1;
 851                 if (ch1 == '-') {
 852                         rej_line('-', i);
 853                         i++;
 854                 } else if (ch1 == ' ' && ch2 == ' ') {
 855                         rej_line(' ', i);
 856                         i++;
 857                         j++;
 858                 } else if (ch1 == '!' && ch2 == '!') {
 859                         while (i < split && ch1 == '!') {
 860                                 rej_line('-', i);
 861                                 i++;
 862                                 ch1 = i < split ? pch_char(i) : -1;
 863                         }
 864                         while (j <= pat_end && ch2 == '!') {
 865                                 rej_line('+', j);
 866                                 j++;
 867                                 ch2 = j <= pat_end ? pch_char(j) : -1;
 868                         }
 869                 } else if (ch1 == '*') {
 870                         i++;
 871                 } else if (ch2 == '+' || ch2 == ' ') {
 872                         rej_line(ch2, j);
 873                         j++;
 874                 } else {
 875                         fprintf(rejfp, "internal error on (%ld %ld %ld)\n",
 876                             i, split, j);
 877                         rej_line(ch1, i);
 878                         rej_line(ch2, j);
 879                         return;
 880                 }
 881         }
 882 }
 883
 884 /* We found where to apply it (we hope), so do it. */
 885
 886 static void
 887 apply_hunk(LINENUM where)
 888 {
 889         LINENUM         old = 1;
 890         const LINENUM   lastline = pch_ptrn_lines();
 891         LINENUM         new = lastline + 1;
 892 #define OUTSIDE 0
 893 #define IN_IFNDEF 1
 894 #define IN_IFDEF 2
 895 #define IN_ELSE 3
 896         int             def_state = OUTSIDE;
 897         const LINENUM   pat_end = pch_end();
 898
 899         where--;
 900         while (pch_char(new) == '=' || pch_char(new) == '\n')
 901                 new++;
 902
 903         while (old <= lastline) {
 904                 if (pch_char(old) == '-') {
 905                         copy_till(where + old - 1, false);
 906                         if (do_defines) {
 907                                 if (def_state == OUTSIDE) {
 908                                         fputs(not_defined, ofp);
 909                                         def_state = IN_IFNDEF;
 910                                 } else if (def_state == IN_IFDEF) {
 911                                         fputs(else_defined, ofp);
 912                                         def_state = IN_ELSE;
 913                                 }
 914                                 fputs(pfetch(old), ofp);
 915                         }
 916                         last_frozen_line++;
 917                         old++;
 918                 } else if (new > pat_end) {
 919                         break;
 920                 } else if (pch_char(new) == '+') {
 921                         copy_till(where + old - 1, false);
 922                         if (do_defines) {
 923                                 if (def_state == IN_IFNDEF) {
 924                                         fputs(else_defined, ofp);
 925                                         def_state = IN_ELSE;
 926                                 } else if (def_state == OUTSIDE) {
 927                                         fputs(if_defined, ofp);
 928                                         def_state = IN_IFDEF;
 929                                 }
 930                         }
 931                         fputs(pfetch(new), ofp);
 932                         new++;
 933                 } else if (pch_char(new) != pch_char(old)) {
 934                         say("Out-of-sync patch, lines %ld,%ld--mangled text or line numbers, maybe?\n",
 935                             pch_hunk_beg() + old,
 936                             pch_hunk_beg() + new);
 937 #ifdef DEBUGGING
 938                         say("oldchar = '%c', newchar = '%c'\n",
 939                             pch_char(old), pch_char(new));
 940 #endif
 941                         my_exit(2);
 942                 } else if (pch_char(new) == '!') {
 943                         copy_till(where + old - 1, false);
 944                         if (do_defines) {
 945                                 fputs(not_defined, ofp);
 946                                 def_state = IN_IFNDEF;
 947                         }
 948                         while (pch_char(old) == '!') {
 949                                 if (do_defines) {
 950                                         fputs(pfetch(old), ofp);
 951                                 }
 952                                 last_frozen_line++;
 953                                 old++;
 954                         }
 955                         if (do_defines) {
 956                                 fputs(else_defined, ofp);
 957                                 def_state = IN_ELSE;
 958                         }
 959                         while (pch_char(new) == '!') {
 960                                 fputs(pfetch(new), ofp);
 961                                 new++;
 962                         }
 963                 } else {
 964                         if (pch_char(new) != ' ')
 965                                 fatal("Internal error: expected ' '\n");
 966                         old++;
 967                         new++;
 968                         if (do_defines && def_state != OUTSIDE) {
 969                                 fputs(end_defined, ofp);
 970                                 def_state = OUTSIDE;
 971                         }
 972                 }
 973         }
 974         if (new <= pat_end && pch_char(new) == '+') {
 975                 copy_till(where + old - 1, false);
 976                 if (do_defines) {
 977                         if (def_state == OUTSIDE) {
 978                                 fputs(if_defined, ofp);
 979                                 def_state = IN_IFDEF;
 980                         } else if (def_state == IN_IFNDEF) {
 981                                 fputs(else_defined, ofp);
 982                                 def_state = IN_ELSE;
 983                         }
 984                 }
 985                 while (new <= pat_end && pch_char(new) == '+') {
 986                         fputs(pfetch(new), ofp);
 987                         new++;
 988                 }
 989         }
 990         if (do_defines && def_state != OUTSIDE) {
 991                 fputs(end_defined, ofp);
 992         }
 993 }
 994
 995 /*
 996  * Open the new file.
 997  */
 998 static void
 999 init_output(const char *name)
1000 {
1001         ofp = fopen(name, "w");
1002         if (ofp == NULL)
1003                 pfatal("can't create %s", name);
1004 }
1005
1006 /*
1007  * Open a file to put hunks we can't locate.
1008  */
1009 static void
1010 init_reject(const char *name)
1011 {
1012         rejfp = fopen(name, "w");
1013         if (rejfp == NULL)
1014                 pfatal("can't create %s", name);
1015 }
1016
1017 /*
1018  * Copy input file to output, up to wherever hunk is to be applied.
1019  * If endoffile is true, treat the last line specially since it may
1020  * lack a newline.
1021  */
1022 static void
1023 copy_till(LINENUM lastline, bool endoffile)
1024 {
1025         if (last_frozen_line > lastline)
1026                 fatal("misordered hunks! output would be garbled\n");
1027         while (last_frozen_line < lastline) {
1028                 if (++last_frozen_line == lastline && endoffile)
1029                         dump_line(last_frozen_line, !last_line_missing_eol);
1030                 else
1031                         dump_line(last_frozen_line, true);
1032         }
1033 }
1034
1035 /*
1036  * Finish copying the input file to the output file.
1037  */
1038 static bool
1039 spew_output(void)
1040 {
1041         int rv;
1042
1043 #ifdef DEBUGGING
1044         if (debug & 256)
1045                 say("il=%ld lfl=%ld\n", input_lines, last_frozen_line);
1046 #endif
1047         if (input_lines)
1048                 copy_till(input_lines, true);   /* dump remainder of file */
1049         rv = ferror(ofp) == 0 && fclose(ofp) == 0;
1050         ofp = NULL;
1051         return rv;
1052 }
1053
1054 /*
1055  * Copy one line from input to output.
1056  */
1057 static void
1058 dump_line(LINENUM line, bool write_newline)
1059 {
1060         char    *s;
1061
1062         s = ifetch(line, 0);
1063         if (s == NULL)
1064                 return;
1065         /* Note: string is not NUL terminated. */
1066         for (; *s != '\n'; s++)
1067                 putc(*s, ofp);
1068         if (write_newline)
1069                 putc('\n', ofp);
1070 }
1071
1072 /*
1073  * Does the patch pattern match at line base+offset?
1074  */
1075 static bool
1076 patch_match(LINENUM base, LINENUM offset, LINENUM fuzz)
1077 {
1078         LINENUM         pline = 1 + fuzz;
1079         LINENUM         iline;
1080         LINENUM         pat_lines = pch_ptrn_lines() - fuzz;
1081         const char      *ilineptr;
1082         const char      *plineptr;
1083         unsigned short  plinelen;
1084
1085         /* Patch does not match if we don't have any more context to use */
1086         if (pline > pat_lines)
1087                 return false;
1088         for (iline = base + offset + fuzz; pline <= pat_lines; pline++, iline++) {
1089                 ilineptr = ifetch(iline, offset >= 0);
1090                 if (ilineptr == NULL)
1091                         return false;
1092                 plineptr = pfetch(pline);
1093                 plinelen = pch_line_len(pline);
1094                 if (canonicalize) {
1095                         if (!similar(ilineptr, plineptr, plinelen))
1096                                 return false;
1097                 } else if (strnNE(ilineptr, plineptr, plinelen))
1098                         return false;
1099                 if (iline == input_lines) {
1100                         /*
1101                          * We are looking at the last line of the file.
1102                          * If the file has no eol, the patch line should
1103                          * not have one either and vice-versa. Note that
1104                          * plinelen > 0.
1105                          */
1106                         if (last_line_missing_eol) {
1107                                 if (plineptr[plinelen - 1] == '\n')
1108                                         return false;
1109                         } else {
1110                                 if (plineptr[plinelen - 1] != '\n')
1111                                         return false;
1112                         }
1113                 }
1114         }
1115         return true;
1116 }
1117
1118 /*
1119  * Do two lines match with canonicalized white space?
1120  */
1121 static bool
1122 similar(const char *a, const char *b, int len)
1123 {
1124         while (len) {
1125                 if (isspace((unsigned char)*b)) {       /* whitespace (or \n) to match? */
1126                         if (!isspace((unsigned char)*a))        /* no corresponding whitespace? */
1127                                 return false;
1128                         while (len && isspace((unsigned char)*b) && *b != '\n')
1129                                 b++, len--;     /* skip pattern whitespace */
1130                         while (isspace((unsigned char)*a) && *a != '\n')
1131                                 a++;    /* skip target whitespace */
1132                         if (*a == '\n' || *b == '\n')
1133                                 return (*a == *b);      /* should end in sync */
1134                 } else if (*a++ != *b++)        /* match non-whitespace chars */
1135                         return false;
1136                 else
1137                         len--;  /* probably not necessary */
1138         }
1139         return true;            /* actually, this is not reached */
1140         /* since there is always a \n */
1141 }
1142
1143 static bool
1144 handle_creation(bool out_existed, bool *remove)
1145 {
1146         bool reverse_seen;
1147
1148         reverse_seen = false;
1149         if (reverse && out_existed) {
1150                 /*
1151                  * If the patch creates the file and we're reversing the patch,
1152                  * then we need to indicate to the patch processor that it's OK
1153                  * to remove this file.
1154                  */
1155                 *remove = true;
1156         } else if (!reverse && out_existed) {
1157                 /*
1158                  * Otherwise, we need to blow the horn because the patch appears
1159                  * to be reversed/already applied.  For non-batch jobs, we'll
1160                  * prompt to figure out what we should be trying to do to raise
1161                  * awareness of the issue.  batch (-t) processing suppresses the
1162                  * questions and just assumes that we're reversed if it looks
1163                  * like we are, which is always the case if we've reached this
1164                  * branch.
1165                  */
1166                 if (force) {
1167                         skip_rest_of_patch = true;
1168                         return (false);
1169                 }
1170                 if (noreverse) {
1171                         /* If -N is supplied, however, we bail out/ignore. */
1172                         say("Ignoring previously applied (or reversed) patch.\n");
1173                         skip_rest_of_patch = true;
1174                         return (false);
1175                 }
1176
1177                 /* Unreversed... suspicious if the file existed. */
1178                 if (!pch_swap())
1179                         fatal("lost hunk on alloc error!\n");
1180
1181                 reverse = !reverse;
1182
1183                 if (batch) {
1184                         if (verbose)
1185                                 say("Patch creates file that already exists, %s %seversed",
1186                                     reverse ? "Assuming" : "Ignoring",
1187                                     reverse ? "R" : "Unr");
1188                 } else {
1189                         ask("Patch creates file that already exists!  %s -R? [y] ",
1190                             reverse ? "Assume" : "Ignore");
1191
1192                         if (*buf == 'n') {
1193                                 ask("Apply anyway? [n]");
1194                                 if (*buf != 'y')
1195                                         /* Don't apply; error out. */
1196                                         skip_rest_of_patch = true;
1197                                 else
1198                                         /* Attempt to apply. */
1199                                         reverse_seen = true;
1200                                 reverse = !reverse;
1201                                 if (!pch_swap())
1202                                         fatal("lost hunk on alloc error!\n");
1203                         } else {
1204                                 /*
1205                                  * They've opted to assume -R; effectively the
1206                                  * same as the first branch in this function,
1207                                  * but the decision is here rather than in a
1208                                  * prior patch/hunk as in that branch.
1209                                  */
1210                                 *remove = true;
1211                         }
1212                 }
1213         }
1214
1215         /*
1216          * The return value indicates if we offered a chance to reverse but the
1217          * user declined.  This keeps the main patch processor in the loop since
1218          * we've taken this out of the normal flow of hunk processing to
1219          * simplify logic a little bit.
1220          */
1221         return (reverse_seen);
1222 }