wiggle.c

   1 /*
   2  * wiggle - apply rejected patches
   3  *
   4  * Copyright (C) 2003 Neil Brown <neilb@cse.unsw.edu.au>
   5  * Copyright (C) 2010-2013 Neil Brown <neilb@suse.de>
   6  *
   7  *
   8  *    This program is free software; you can redistribute it and/or modify
   9  *    it under the terms of the GNU General Public License as published by
  10  *    the Free Software Foundation; either version 2 of the License, or
  11  *    (at your option) any later version.
  12  *
  13  *    This program is distributed in the hope that it will be useful,
  14  *    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *    GNU General Public License for more details.
  17  *
  18  *    You should have received a copy of the GNU General Public License
  19  *    along with this program.
  20  *
  21  *    Author: Neil Brown
  22  *    Email: <neilb@suse.de>
  23  */
  24
  25 /*
  26  * Wiggle is a tool for working with patches that don't quite apply properly.
  27  * It provides functionality similar to 'diff' and 'merge' but can
  28  * work at the level of individual words thus allowing the merging of
  29  * two changes that affect the same line, but not the same parts of that line.
  30  *
  31  * Wiggle can also read patch and merge files.  Unlike 'merge' it does not
  32  * need to be given three separate files, but can be given a file and a patch
  33  * and it will extract the pieces of the two other files that it needs from
  34  * the patch.
  35  *
  36  * Wiggle performs one of three core function:
  37  *   --extract -x    extract part of a patch or merge file
  38  *   --diff -d       report differences between two files
  39  *   --merge -m      merge the changes between two files into a third file
  40  *
  41  * This is also a --browse (-B) mode which provides interactive access
  42  * to the merger.
  43  *
  44  * To perform these, wiggle requires 1, 2, or 3 input streams respectively.
  45  * I can get these from individual files, from a diff (unified or context) or
  46  * from a merge file.
  47  *
  48  * For merge:
  49  *    If one file is given, it is a merge file (output of 'merge').
  50  *    If two files are given, the second is assumed to be a patch,
  51  *         the first is a normal file.
  52  *    If three files are given, they are taken to be normal files.
  53  *
  54  * For diff:
  55  *    If one file is given, it is a patch
  56  *    If two files are given, they are normal files.
  57  *
  58  * For extract:
  59  *    Only one file can be given. -p indicates it is a patch,
  60  *        otherwise it is a merge.
  61  *    One of the flags -1 -2 or -3 must also be given and they indicate which
  62  *    part of the patch or merge to extract.
  63  *
  64  * Difference calculation and merging is performed on lines (-l) or words (-w).
  65  * Each 'word' is either 1/all alphnumeric (or '_'), 2/ all space or tab,
  66  * or 3/ any other single character.
  67  *
  68  * In the case of -w, an initial diff is computed based on non-trivial words
  69  * which includes alhpanumeric words and newlines.
  70  *
  71  * This diff is computed from the ends of the file and is used to find
  72  * a suitable starting point and range.  Then a more precise diff is
  73  * computed over that restricted range
  74  *
  75  * Other options available are:
  76  *   --replace -r   replace first file with  result of merge.
  77  *   --help -h      provide help
  78  *   --version -v   version
  79  *
  80  * Defaults are --merge --words
  81  *
  82  */
  83 #define _GNU_SOURCE
  84 #include        "wiggle.h"
  85 #include        <errno.h>
  86 #include        <fcntl.h>
  87 #include        <unistd.h>
  88 #include        <stdlib.h>
  89 #include        <stdio.h>
  90 #include        <ctype.h>
  91 #include        <sys/stat.h>
  92
  93 char *Cmd = "wiggle";
  94 int do_trace = 0;
  95
  96 void die(char *reason)
  97 {
  98         fprintf(stderr, "%s: fatal error: %s failure\n", Cmd, reason);
  99         exit(3);
 100 }
 101
 102 void check_dir(char *name, int fd)
 103 {
 104         struct stat st;
 105         if (fstat(fd, &st) != 0) {
 106                 fprintf(stderr, "%s: fatal: %s is strange\n", Cmd, name);
 107                 exit(3);
 108         }
 109         if (S_ISDIR(st.st_mode)) {
 110                 fprintf(stderr, "%s: %s is a directory\n", Cmd, name);
 111                 exit(3);
 112         }
 113 }
 114
 115 void *xmalloc(int size)
 116 {
 117         void *rv = malloc(size);
 118         if (size && !rv) {
 119                 char *msg = "Failed to allocate memory - aborting\n";
 120                 write(2, msg, strlen(msg));
 121                 exit(3);
 122         }
 123         return rv;
 124 }
 125
 126 void printword(FILE *f, struct elmnt e)
 127 {
 128         if (e.start[0])
 129                 fprintf(f, "%.*s", e.plen + e.prefix,
 130                         e.start - e.prefix);
 131         else {
 132                 int a, b, c;
 133                 sscanf(e.start+1, "%d %d %d", &a, &b, &c);
 134                 fprintf(f, "*** %d,%d **** %d%s", b, c, a, e.start+18);
 135         }
 136 }
 137
 138 static void printsep(struct elmnt e1, struct elmnt e2)
 139 {
 140         int a, b, c, d, e, f;
 141         sscanf(e1.start+1, "%d %d %d", &a, &b, &c);
 142         sscanf(e2.start+1, "%d %d %d", &d, &e, &f);
 143         printf("@@ -%d,%d +%d,%d @@%s", b, c, e, f, e1.start+18);
 144 }
 145
 146 static int extract(int argc, char *argv[], int ispatch, int which)
 147 {
 148         /* extract a branch of a diff or diff3 or merge output
 149          * We need one file
 150          */
 151         struct stream f, flist[3];
 152
 153         if (argc == 0) {
 154                 fprintf(stderr,
 155                         "%s: no file given for --extract\n", Cmd);
 156                 return 2;
 157         }
 158         if (argc > 1) {
 159                 fprintf(stderr,
 160                         "%s: only give one file for --extract\n", Cmd);
 161                 return 2;
 162         }
 163         f = load_file(argv[0]);
 164         if (f.body == NULL) {
 165                 fprintf(stderr,
 166                         "%s: cannot load file '%s' - %s\n", Cmd,
 167                         argv[0], strerror(errno));
 168                 return 2;
 169         }
 170         if (ispatch) {
 171                 if (split_patch(f, &flist[0], &flist[1]) == 0) {
 172                         fprintf(stderr,
 173                                 "%s: No chunk found in patch: %s\n", Cmd,
 174                                 argv[0]);
 175                         return 0;
 176                 }
 177         } else {
 178                 if (!split_merge(f, &flist[0], &flist[1], &flist[2])) {
 179                         fprintf(stderr,
 180                                 "%s: merge file %s looks bad.\n", Cmd,
 181                                 argv[0]);
 182                         return 2;
 183                 }
 184         }
 185         if (flist[which-'1'].body == NULL) {
 186                 fprintf(stderr,
 187                         "%s: %s has no -%c component.\n", Cmd,
 188                         argv[0], which);
 189                 return 2;
 190         } else {
 191                 if (write(1, flist[which-'1'].body,
 192                           flist[which-'1'].len)
 193                     != flist[which-'1'].len)
 194                         return 2;
 195         }
 196         return 0;
 197 }
 198
 199 static int do_diff_lines(struct file fl[2], struct csl *csl)
 200 {
 201         int a, b;
 202         int exit_status = 0;
 203         a = b = 0;
 204         while (a < fl[0].elcnt || b < fl[1].elcnt) {
 205                 if (a < csl->a) {
 206                         if (fl[0].list[a].start[0]) {
 207                                 printf("-");
 208                                 printword(stdout,
 209                                           fl[0].list[a]);
 210                         }
 211                         a++;
 212                         exit_status++;
 213                 } else if (b < csl->b) {
 214                         if (fl[1].list[b].start[0]) {
 215                                 printf("+");
 216                                 printword(stdout,
 217                                           fl[1].list[b]);
 218                         }
 219                         b++;
 220                         exit_status++;
 221                 } else {
 222                         if (fl[0].list[a].start[0] == '\0')
 223                                 printsep(fl[0].list[a],
 224                                          fl[1].list[b]);
 225                         else {
 226                                 printf(" ");
 227                                 printword(stdout,
 228                                           fl[0].list[a]);
 229                         }
 230                         a++;
 231                         b++;
 232                         if (a >= csl->a+csl->len)
 233                                 csl++;
 234                 }
 235         }
 236         return exit_status;
 237 }
 238
 239 static int do_diff_words(struct file fl[2], struct csl *csl)
 240 {
 241         int a, b;
 242         int exit_status  = 0;
 243         int sol = 1; /* start of line */
 244         a = b = 0;
 245         while (a < fl[0].elcnt || b < fl[1].elcnt) {
 246                 if (a < csl->a) {
 247                         exit_status++;
 248                         if (sol) {
 249                                 int a1;
 250                                 /* If we remove a
 251                                  * whole line, output
 252                                  * +line else clear
 253                                  * sol and retry */
 254                                 sol = 0;
 255                                 for (a1 = a; a1 < csl->a ; a1++)
 256                                         if (ends_line(fl[0].list[a1])) {
 257                                                 sol = 1;
 258                                                 break;
 259                                         }
 260                                 if (sol) {
 261                                         printf("-");
 262                                         for (; a < csl->a ; a++) {
 263                                                 printword(stdout, fl[0].list[a]);
 264                                                 if (ends_line(fl[0].list[a])) {
 265                                                         a++;
 266                                                         break;
 267                                                 }
 268                                         }
 269                                 } else
 270                                         printf("|");
 271                         }
 272                         if (!sol) {
 273                                 printf("<<<--");
 274                                 do {
 275                                         if (sol)
 276                                                 printf("|");
 277                                         printword(stdout, fl[0].list[a]);
 278                                         sol = ends_line(fl[0].list[a]);
 279                                         a++;
 280                                 } while (a < csl->a);
 281                                 printf("%s-->>>", sol ? "|" : "");
 282                                 sol = 0;
 283                         }
 284                 } else if (b < csl->b) {
 285                         exit_status++;
 286                         if (sol) {
 287                                 int b1;
 288                                 sol = 0;
 289                                 for (b1 = b; b1 < csl->b; b1++)
 290                                         if (ends_line(fl[1].list[b1])) {
 291                                                 sol = 1;
 292                                                 break;
 293                                         }
 294                                 if (sol) {
 295                                         printf("+");
 296                                         for (; b < csl->b ; b++) {
 297                                                 printword(stdout, fl[1].list[b]);
 298                                                 if (ends_line(fl[1].list[b])) {
 299                                                         b++;
 300                                                         break;
 301                                                 }
 302                                         }
 303                                 } else
 304                                         printf("|");
 305                         }
 306                         if (!sol) {
 307                                 printf("<<<++");
 308                                 do {
 309                                         if (sol)
 310                                                 printf("|");
 311                                         printword(stdout, fl[1].list[b]);
 312                                         sol = ends_line(fl[1].list[b]);
 313                                         b++;
 314                                 } while (b < csl->b);
 315                                 printf("%s++>>>", sol ? "|" : "");
 316                                 sol = 0;
 317                         }
 318                 } else {
 319                         if (sol) {
 320                                 int a1;
 321                                 sol = 0;
 322                                 for (a1 = a; a1 < csl->a+csl->len; a1++)
 323                                         if (ends_line(fl[0].list[a1]))
 324                                                 sol = 1;
 325                                 if (sol) {
 326                                         if (fl[0].list[a].start[0]) {
 327                                                 printf(" ");
 328                                                 for (; a < csl->a+csl->len; a++, b++) {
 329                                                         printword(stdout, fl[0].list[a]);
 330                                                         if (ends_line(fl[0].list[a])) {
 331                                                                 a++, b++;
 332                                                                 break;
 333                                                         }
 334                                                 }
 335                                         } else {
 336                                                 printsep(fl[0].list[a], fl[1].list[b]);
 337                                                 a++; b++;
 338                                         }
 339                                 } else
 340                                         printf("|");
 341                         }
 342                         if (!sol) {
 343                                 printword(stdout, fl[0].list[a]);
 344                                 if (ends_line(fl[0].list[a]))
 345                                         sol = 1;
 346                                 a++;
 347                                 b++;
 348                         }
 349                         if (a >= csl->a+csl->len)
 350                                 csl++;
 351                 }
 352         }
 353         return exit_status;
 354 }
 355
 356 static int do_diff(int argc, char *argv[], int obj, int ispatch,
 357                    int which, int reverse)
 358 {
 359         /* create a diff (line or char) of two streams */
 360         struct stream f, flist[3];
 361         int chunks1 = 0, chunks2 = 0, chunks3 = 0;
 362         int exit_status = 0;
 363         struct file fl[2];
 364         struct csl *csl;
 365
 366         switch (argc) {
 367         case 0:
 368                 fprintf(stderr, "%s: no file given for --diff\n", Cmd);
 369                 return 2;
 370         case 1:
 371                 f = load_file(argv[0]);
 372                 if (f.body == NULL) {
 373                         fprintf(stderr,
 374                                 "%s: cannot load file '%s' - %s\n", Cmd,
 375                                 argv[0], strerror(errno));
 376                         return 2;
 377                 }
 378                 chunks1 = chunks2 =
 379                         split_patch(f, &flist[0], &flist[1]);
 380                 if (!flist[0].body || !flist[1].body) {
 381                         fprintf(stderr,
 382                                 "%s: couldn't parse patch %s\n", Cmd,
 383                                 argv[0]);
 384                         return 2;
 385                 }
 386                 break;
 387         case 2:
 388                 flist[0] = load_file(argv[0]);
 389                 if (flist[0].body == NULL) {
 390                         fprintf(stderr,
 391                                 "%s: cannot load file '%s' - %s\n", Cmd,
 392                                 argv[0], strerror(errno));
 393                         return 2;
 394                 }
 395                 if (ispatch) {
 396                         f = load_file(argv[1]);
 397                         if (f.body == NULL) {
 398                                 fprintf(stderr,
 399                                         "%s: cannot load patch '%s' - %s\n", Cmd,
 400                                         argv[1], strerror(errno));
 401                                 return 2;
 402                         }
 403                         if (which == '2')
 404                                 chunks2 = chunks3 =
 405                                         split_patch(f, &flist[2],
 406                                                     &flist[1]);
 407                         else
 408                                 chunks2 = chunks3 =
 409                                         split_patch(f, &flist[1],
 410                                                     &flist[2]);
 411
 412                 } else
 413                         flist[1] = load_file(argv[1]);
 414                 if (flist[1].body == NULL) {
 415                         fprintf(stderr,
 416                                 "%s: cannot load file '%s' - %s\n", Cmd,
 417                                 argv[1], strerror(errno));
 418                         return 2;
 419                 }
 420                 break;
 421         default:
 422                 fprintf(stderr,
 423                         "%s: too many files given for --diff\n", Cmd);
 424                 return 2;
 425         }
 426         if (reverse) {
 427                 f = flist[1];
 428                 flist[1] = flist[2];
 429                 flist[2] = f;
 430         }
 431         fl[0] = split_stream(flist[0], obj);
 432         fl[1] = split_stream(flist[1], obj);
 433         if (chunks2 && !chunks1)
 434                 csl = pdiff(fl[0], fl[1], chunks2);
 435         else
 436                 csl = diff_patch(fl[0], fl[1]);
 437         if ((obj & ByMask) == ByLine) {
 438                 if (!chunks1)
 439                         printf("@@ -1,%d +1,%d @@\n",
 440                                fl[0].elcnt, fl[1].elcnt);
 441                 exit_status = do_diff_lines(fl, csl);
 442         } else {
 443                 if (!chunks1) {
 444                         /* count lines in each file */
 445                         int l1, l2, i;
 446                         l1 = l2 = 0;
 447                         for (i = 0 ; i < fl[0].elcnt ; i++)
 448                                 if (ends_line(fl[0].list[i]))
 449                                         l1++;
 450                         for (i = 0 ; i < fl[1].elcnt ; i++)
 451                                 if (ends_line(fl[1].list[i]))
 452                                         l2++;
 453                         printf("@@ -1,%d +1,%d @@\n", l1, l2);
 454                 }
 455                 exit_status = do_diff_words(fl, csl);
 456         }
 457         return exit_status;
 458 }
 459
 460 static int do_merge(int argc, char *argv[], int obj, int blanks,
 461                     int reverse, int replace, char *outfilename,
 462                     int ignore, int show_wiggles,
 463                     int quiet)
 464 {
 465         /* merge three files, A B C, so changed between B and C get made to A
 466          */
 467         struct stream f, flist[3];
 468         struct file fl[3];
 469         int i;
 470         int chunks1 = 0, chunks2 = 0, chunks3 = 0;
 471         char *replacename = NULL, *orignew = NULL;
 472         struct csl *csl1, *csl2;
 473         struct ci ci;
 474         FILE *outfile = stdout;
 475
 476         switch (argc) {
 477         case 0:
 478                 fprintf(stderr, "%s: no files given for --merge\n", Cmd);
 479                 return 2;
 480         case 3:
 481         case 2:
 482         case 1:
 483                 for (i = 0; i < argc; i++) {
 484                         flist[i] = load_file(argv[i]);
 485                         if (flist[i].body == NULL) {
 486                                 fprintf(stderr, "%s: cannot load file '%s' - %s\n",
 487                                         Cmd,
 488                                         argv[i], strerror(errno));
 489                                 return 2;
 490                         }
 491                 }
 492                 break;
 493         default:
 494                 fprintf(stderr, "%s: too many files given for --merge\n",
 495                         Cmd);
 496                 return 2;
 497         }
 498         switch (argc) {
 499         case 1: /* a merge file */
 500                 f = flist[0];
 501                 if (!split_merge(f, &flist[0], &flist[1], &flist[2])) {
 502                         fprintf(stderr, "%s: merge file %s looks bad.\n",
 503                                 Cmd,
 504                                 argv[0]);
 505                         return 2;
 506                 }
 507                 break;
 508         case 2: /* a file and a patch */
 509                 f = flist[1];
 510                 chunks2 = chunks3 = split_patch(f, &flist[1], &flist[2]);
 511                 break;
 512         case 3: /* three separate files */
 513                 break;
 514         }
 515         if (reverse) {
 516                 f = flist[1];
 517                 flist[1] = flist[2];
 518                 flist[2] = f;
 519         }
 520
 521         for (i = 0; i < 3; i++) {
 522                 if (flist[i].body == NULL) {
 523                         fprintf(stderr, "%s: file %d missing\n", Cmd, i);
 524                         return 2;
 525                 }
 526         }
 527         if (outfilename) {
 528                 outfile = fopen(outfilename, "w");
 529                 if (!outfile) {
 530                         fprintf(stderr, "%s: could not create %s\n",
 531                                 Cmd, outfilename);
 532                         return 2;
 533                 }
 534         } else if (replace) {
 535                 int fd;
 536                 replacename = xmalloc(strlen(argv[0]) + 20);
 537                 orignew = xmalloc(strlen(argv[0]) + 20);
 538                 strcpy(replacename, argv[0]);
 539                 strcpy(orignew, argv[0]);
 540                 strcat(orignew, ".porig");
 541                 if (open(orignew, O_RDONLY) >= 0 ||
 542                     errno != ENOENT) {
 543                         fprintf(stderr, "%s: %s already exists\n",
 544                                 Cmd,
 545                                 orignew);
 546                         free(replacename);
 547                         free(orignew);
 548                         return 2;
 549                 }
 550                 strcat(replacename, "XXXXXX");
 551                 fd = mkstemp(replacename);
 552                 if (fd == -1) {
 553                         fprintf(stderr,
 554                                 "%s: could not create temporary file for %s\n",
 555                                 Cmd,
 556                                 replacename);
 557                         free(replacename);
 558                         free(orignew);
 559                         return 2;
 560                 }
 561                 outfile = fdopen(fd, "w");
 562         }
 563
 564         if (obj == 'l')
 565                 blanks |= ByLine;
 566         else
 567                 blanks |= ByWord;
 568         fl[0] = split_stream(flist[0], blanks);
 569         fl[1] = split_stream(flist[1], blanks);
 570         fl[2] = split_stream(flist[2], blanks);
 571
 572         if (chunks2 && !chunks1)
 573                 csl1 = pdiff(fl[0], fl[1], chunks2);
 574         else
 575                 csl1 = diff(fl[0], fl[1]);
 576         csl2 = diff_patch(fl[1], fl[2]);
 577
 578         ci = make_merger(fl[0], fl[1], fl[2], csl1, csl2,
 579                          obj == 'w', ignore, show_wiggles > 1);
 580         print_merge(outfile, &fl[0], &fl[1], &fl[2],
 581                     obj == 'w', ci.merger, NULL, 0, 0);
 582         if (!quiet && ci.conflicts)
 583                 fprintf(stderr,
 584                         "%d unresolved conflict%s found\n",
 585                         ci.conflicts,
 586                         ci.conflicts == 1 ? "" : "s");
 587         if (!quiet && ci.ignored)
 588                 fprintf(stderr,
 589                         "%d already-applied change%s ignored\n",
 590                         ci.ignored,
 591                         ci.ignored == 1 ? "" : "s");
 592
 593         if (outfilename)
 594                 fclose(outfile);
 595         else if (replace) {
 596                 struct stat statbuf;
 597
 598                 if (stat(argv[0], &statbuf) != 0) {
 599                         fprintf(stderr,
 600                                 "%s: failed to stat original file. - %s\n",
 601                                 Cmd, strerror(errno));
 602                         free(replacename);
 603                         free(orignew);
 604                         return 2;
 605                 }
 606                 if (fchmod(fileno(outfile), statbuf.st_mode) != 0) {
 607                         fprintf(stderr,
 608                                 "%s: failed to change permission of new file. - %s\n",
 609                                 Cmd, strerror(errno));
 610                         free(replacename);
 611                         free(orignew);
 612                         return 2;
 613                 }
 614                 fclose(outfile);
 615                 if (rename(argv[0], orignew) == 0 &&
 616                     rename(replacename, argv[0]) == 0)
 617                         /* all ok */;
 618                 else {
 619                         fprintf(stderr,
 620                                 "%s: failed to move new file into place.\n",
 621                                 Cmd);
 622                         free(replacename);
 623                         free(orignew);
 624                         return 2;
 625                 }
 626         }
 627         if (replacename)
 628                 free(replacename);
 629         if (orignew)
 630                 free(orignew);
 631         if (show_wiggles)
 632                 return ci.conflicts + ci.wiggles > 0;
 633         else
 634                 return ci.conflicts > 0;
 635 }
 636
 637 static int multi_merge(int argc, char *argv[], int obj, int blanks,
 638                        int reverse, int ignore, int show_wiggles,
 639                        int replace, int strip,
 640                        int quiet)
 641 {
 642         FILE *f;
 643         char *filename;
 644         struct plist *pl;
 645         int num_patches;
 646         int rv = 0;
 647         int i;
 648
 649         if (!replace) {
 650                 fprintf(stderr,
 651                         "%s: -p in merge mode requires -r\n",
 652                         Cmd);
 653                 return 2;
 654         }
 655         if (argc != 1) {
 656                 fprintf(stderr,
 657                         "%s: -p in merge mode requires exactly one file\n",
 658                         Cmd);
 659                 return 2;
 660         }
 661         filename = argv[0];
 662         f = fopen(filename, "r");
 663         if (!f) {
 664                 fprintf(stderr, "%s: cannot open %s\n",
 665                         Cmd, filename);
 666                 return 2;
 667         }
 668         check_dir(filename, fileno(f));
 669         pl = parse_patch(f, NULL, &num_patches);
 670         fclose(f);
 671         if (set_prefix(pl, num_patches, strip) == 0) {
 672                 fprintf(stderr, "%s: aborting\n", Cmd);
 673                 return 2;
 674         }
 675         for (i = 0; i < num_patches; i++) {
 676                 char *name;
 677                 char *av[2];
 678                 asprintf(&name, "_wiggle_:%d:%d:%s",
 679                          pl[i].start, pl[i].end, filename);
 680                 av[0] = pl[i].file;
 681                 av[1] = name;
 682                 rv |= do_merge(2, av, obj, blanks, reverse, 1, NULL, ignore,
 683                          show_wiggles, quiet);
 684         }
 685         return rv;
 686 }
 687
 688 int main(int argc, char *argv[])
 689 {
 690         int opt;
 691         int option_index;
 692         int mode = 0;
 693         int obj = 0;
 694         int replace = 0;
 695         int backup = 1;
 696         int which = 0;
 697         int ispatch = 0;
 698         int reverse = 0;
 699         int verbose = 0, quiet = 0;
 700         int strip = -1;
 701         int exit_status = 0;
 702         int ignore = 1;
 703         int show_wiggles = 0;
 704         char *helpmsg;
 705         char *trace;
 706         char *outfile = NULL;
 707         int selftest = 0;
 708         int ignore_blanks = 0;
 709
 710         trace = getenv("WIGGLE_TRACE");
 711         if (trace && *trace)
 712                 do_trace = 1;
 713
 714         while ((opt = getopt_long(argc, argv,
 715                                   short_options, long_options,
 716                                   &option_index)) != -1)
 717                 switch (opt) {
 718                 case 'h':
 719                         helpmsg = Help;
 720                         switch (mode) {
 721                         case 'x':
 722                                 helpmsg = HelpExtract;
 723                                 break;
 724                         case 'd':
 725                                 helpmsg = HelpDiff;
 726                                 break;
 727                         case 'm':
 728                                 helpmsg = HelpMerge;
 729                                 break;
 730                         case 'B':
 731                                 helpmsg = HelpBrowse;
 732                                 break;
 733                         }
 734                         fputs(helpmsg, stderr);
 735                         exit(0);
 736
 737                 case 'V':
 738                         fputs(Version, stderr);
 739                         exit(0);
 740                 case ':':
 741                 case '?':
 742                 default:
 743                         fputs(Usage, stderr);
 744                         exit(2);
 745
 746                 case 'B':
 747                 case 'x':
 748                 case 'd':
 749                 case 'm':
 750                         if (mode == 0) {
 751                                 mode = opt;
 752                                 continue;
 753                         }
 754                         if (mode == 'B' && opt == 'd') {
 755                                 /* Browse/diff mode */
 756                                 ispatch = 2;
 757                                 continue;
 758                         }
 759                         fprintf(stderr,
 760                                 "%s: mode is '%c' - cannot set to '%c'\n",
 761                                 Cmd, mode, opt);
 762                         exit(2);
 763
 764                 case 'w':
 765                 case 'l':
 766                         if (obj == 0 || obj == opt) {
 767                                 obj = opt;
 768                                 continue;
 769                         }
 770                         fprintf(stderr,
 771                                 "%s: cannot select both words and lines.\n", Cmd);
 772                         exit(2);
 773
 774                 case 'r':
 775                         replace = 1;
 776                         continue;
 777                 case NO_BACKUP:
 778                         backup = 0;
 779                         continue;
 780                 case 'o':
 781                         outfile = optarg;
 782                         replace = 1;
 783                         continue;
 784                 case 'R':
 785                         reverse = 1;
 786                         continue;
 787
 788                 case 'b':
 789                         ignore_blanks = IgnoreBlanks;
 790                         continue;
 791
 792                 case 'i':
 793                         ignore = 0;
 794                         continue;
 795                 case 'W':
 796                         show_wiggles = 2;
 797                         ignore = 0;
 798                         continue;
 799                 case REPORT_WIGGLES:
 800                         show_wiggles = 1;
 801                         continue;
 802
 803                 case '1':
 804                 case '2':
 805                 case '3':
 806                         if (which == 0 || which == opt) {
 807                                 which = opt;
 808                                 continue;
 809                         }
 810                         fprintf(stderr,
 811                                 "%s: can only select one of -1, -2, -3\n", Cmd);
 812                         exit(2);
 813
 814                 case 'p': /* 'patch' or 'strip' */
 815                         if (optarg)
 816                                 strip = atol(optarg);
 817                         ispatch = 1;
 818                         continue;
 819
 820                 case 'v':
 821                         verbose++;
 822                         continue;
 823                 case 'q':
 824                         quiet = 1;
 825                         continue;
 826
 827                 case SELF_TEST:
 828                         selftest = 1;
 829                         continue;
 830                 }
 831         if (!mode)
 832                 mode = 'm';
 833
 834         if (mode == 'B') {
 835                 vpatch(argc-optind, argv+optind, ispatch,
 836                        strip, reverse, replace, outfile, selftest,
 837                        ignore_blanks, backup);
 838                 /* should not return */
 839                 exit(1);
 840         }
 841
 842         if (obj && mode == 'x') {
 843                 fprintf(stderr,
 844                         "%s: cannot specify --line or --word with --extract\n",
 845                         Cmd);
 846                 exit(2);
 847         }
 848         if (mode != 'm' && !obj)
 849                 obj = 'w';
 850         if (ispatch && outfile) {
 851                 fprintf(stderr, "%s: --output incompatible with --patch\n",
 852                         Cmd);
 853                 exit(2);
 854         }
 855         if (replace && mode != 'm') {
 856                 fprintf(stderr,
 857                         "%s: --replace or --output only allowed with --merge\n", Cmd);
 858                 exit(2);
 859         }
 860         if (mode == 'x' && !which) {
 861                 fprintf(stderr,
 862                         "%s: must specify -1, -2 or -3 with --extract\n", Cmd);
 863                 exit(2);
 864         }
 865         if (mode != 'x' && mode != 'd' && which) {
 866                 fprintf(stderr,
 867                         "%s: -1, -2 or -3 only allowed with --extract or --diff\n",
 868                         Cmd);
 869                 exit(2);
 870         }
 871
 872         if (ispatch && which == '3') {
 873                 fprintf(stderr,
 874                         "%s: cannot extract -3 from a patch.\n", Cmd);
 875                 exit(2);
 876         }
 877
 878         switch (mode) {
 879         case 'x':
 880                 exit_status = extract(argc-optind, argv+optind, ispatch, which);
 881                 break;
 882         case 'd':
 883                 exit_status = do_diff(argc-optind, argv+optind,
 884                                       (obj == 'l' ? ByLine : ByWord)
 885                                       | ignore_blanks,
 886                                       ispatch, which, reverse);
 887                 break;
 888         case 'm':
 889                 if (ispatch)
 890                         exit_status = multi_merge(argc-optind,
 891                                                   argv+optind, obj,
 892                                                   ignore_blanks,
 893                                                   reverse, ignore,
 894                                                   show_wiggles,
 895                                                   replace, strip,
 896                                                   quiet);
 897                 else
 898                         exit_status = do_merge(
 899                                 argc-optind, argv+optind,
 900                                 obj, ignore_blanks, reverse, replace,
 901                                 outfile,
 902                                 ignore, show_wiggles, quiet);
 903                 break;
 904         }
 905         exit(exit_status);
 906 }