usr.bin/whereis/whereis.c

   1 /*
   2  * Copyright © 2002, Jörg Wunsch
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  * 1. Redistributions of source code must retain the above copyright
   8  *    notice, this list of conditions and the following disclaimer.
   9  * 2. Redistributions in binary form must reproduce the above copyright
  10  *    notice, this list of conditions and the following disclaimer in the
  11  *    documentation and/or other materials provided with the distribution.
  12  *
  13  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
  14  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  15  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  16  * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT,
  17  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  18  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  19  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  20  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  21  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  22  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  23  * POSSIBILITY OF SUCH DAMAGE.
  24  * $FreeBSD: src/usr.bin/whereis/whereis.c,v 1.12 2002/08/22 01:50:51 johan Exp $
  25  * $DragonFly: src/usr.bin/whereis/whereis.c,v 1.6 2008/06/05 18:06:33 swildner Exp $
  26  */
  27
  28 /*
  29  * 4.3BSD UI-compatible whereis(1) utility.  Rewritten from scratch
  30  * since the original 4.3BSD version suffers legal problems that
  31  * prevent it from being redistributed, and since the 4.4BSD version
  32  * was pretty inferior in functionality.
  33  */
  34
  35 #include <sys/types.h>
  36
  37
  38 #include <sys/stat.h>
  39 #include <sys/sysctl.h>
  40
  41 #include <dirent.h>
  42 #include <err.h>
  43 #include <errno.h>
  44 #include <locale.h>
  45 #include <regex.h>
  46 #include <stdio.h>
  47 #include <stdlib.h>
  48 #include <string.h>
  49 #include <sysexits.h>
  50 #include <unistd.h>
  51
  52 #include "pathnames.h"
  53
  54 #define NO_BIN_FOUND    1
  55 #define NO_MAN_FOUND    2
  56 #define NO_SRC_FOUND    4
  57
  58 typedef const char *ccharp;
  59
  60 int opt_a, opt_b, opt_m, opt_q, opt_s, opt_u, opt_x;
  61 ccharp *bindirs, *mandirs, *sourcedirs;
  62 char **query;
  63
  64 const char *sourcepath = PATH_SOURCES;
  65
  66 char    *colonify(ccharp *);
  67 int      contains(ccharp *, const char *);
  68 void     decolonify(char *, ccharp **, int *);
  69 void     defaults(void);
  70 void     scanopts(int, char **);
  71 void     usage(void);
  72
  73 /*
  74  * Throughout this program, a number of strings are dynamically
  75  * allocated but never freed.  Their memory is written to when
  76  * splitting the strings into string lists which will later be
  77  * processed.  Since it's important that those string lists remain
  78  * valid even after the functions allocating the memory returned,
  79  * those functions cannot free them.  They could be freed only at end
  80  * of main(), which is pretty pointless anyway.
  81  *
  82  * The overall amount of memory to be allocated for processing the
  83  * strings is not expected to exceed a few kilobytes.  For that
  84  * reason, allocation can usually always be assumed to succeed (within
  85  * a virtual memory environment), thus we simply bail out using
  86  * abort(3) in case of an allocation failure.
  87  */
  88
  89 void
  90 usage(void)
  91 {
  92         errx(EX_USAGE,
  93              "usage: whereis [-abmqsux] [-BMS dir... -f] name ...");
  94 }
  95
  96 /*
  97  * Scan options passed to program.
  98  *
  99  * Note that the -B/-M/-S options expect a list of directory
 100  * names that must be terminated with -f.
 101  */
 102 void
 103 scanopts(int argc, char **argv)
 104 {
 105         int c, i;
 106         ccharp **dirlist;
 107
 108         while ((c = getopt(argc, argv, "BMSabfmqsux")) != -1)
 109                 switch (c) {
 110                 case 'B':
 111                         dirlist = &bindirs;
 112                         goto dolist;
 113
 114                 case 'M':
 115                         dirlist = &mandirs;
 116                         goto dolist;
 117
 118                 case 'S':
 119                         dirlist = &sourcedirs;
 120                   dolist:
 121                         i = 0;
 122                         *dirlist = realloc(*dirlist, (i + 1) * sizeof(char *));
 123                         (*dirlist)[i] = NULL;
 124                         while (optind < argc &&
 125                                strcmp(argv[optind], "-f") != 0 &&
 126                                strcmp(argv[optind], "-B") != 0 &&
 127                                strcmp(argv[optind], "-M") != 0 &&
 128                                strcmp(argv[optind], "-S") != 0) {
 129                                 decolonify(argv[optind], dirlist, &i);
 130                                 optind++;
 131                         }
 132                         break;
 133
 134                 case 'a':
 135                         opt_a = 1;
 136                         break;
 137
 138                 case 'b':
 139                         opt_b = 1;
 140                         break;
 141
 142                 case 'f':
 143                         goto breakout;
 144
 145                 case 'm':
 146                         opt_m = 1;
 147                         break;
 148
 149                 case 'q':
 150                         opt_q = 1;
 151                         break;
 152
 153                 case 's':
 154                         opt_s = 1;
 155                         break;
 156
 157                 case 'u':
 158                         opt_u = 1;
 159                         break;
 160
 161                 case 'x':
 162                         opt_x = 1;
 163                         break;
 164
 165                 default:
 166                         usage();
 167                 }
 168   breakout:
 169         if (optind == argc)
 170                 usage();
 171         query = argv + optind;
 172 }
 173
 174 /*
 175  * Find out whether string `s' is contained in list `cpp'.
 176  */
 177 int
 178 contains(ccharp *cpp, const char *s)
 179 {
 180         ccharp cp;
 181
 182         if (cpp == NULL)
 183                 return (0);
 184
 185         while ((cp = *cpp) != NULL) {
 186                 if (strcmp(cp, s) == 0)
 187                         return (1);
 188                 cpp++;
 189         }
 190         return (0);
 191 }
 192
 193 /*
 194  * Split string `s' at colons, and pass it to the string list pointed
 195  * to by `cppp' (which has `*ip' elements).  Note that the original
 196  * string is modified by replacing the colon with a NUL byte.  The
 197  * partial string is only added if it has a length greater than 0, and
 198  * if it's not already contained in the string list.
 199  */
 200 void
 201 decolonify(char *s, ccharp **cppp, int *ip)
 202 {
 203         char *cp;
 204
 205         while ((cp = strchr(s, ':')), *s != '\0') {
 206                 if (cp)
 207                         *cp = '\0';
 208                 if (strlen(s) && !contains(*cppp, s)) {
 209                         *cppp = realloc(*cppp, (*ip + 2) * sizeof(char *));
 210                         if (cppp == NULL)
 211                                 abort();
 212                         (*cppp)[*ip] = s;
 213                         (*cppp)[*ip + 1] = NULL;
 214                         (*ip)++;
 215                 }
 216                 if (cp)
 217                         s = cp + 1;
 218                 else
 219                         break;
 220         }
 221 }
 222
 223 /*
 224  * Join string list `cpp' into a colon-separated string.
 225  */
 226 char *
 227 colonify(ccharp *cpp)
 228 {
 229         size_t s;
 230         char *cp;
 231         int i;
 232
 233         if (cpp == NULL)
 234                 return (0);
 235
 236         for (s = 0, i = 0; cpp[i] != NULL; i++)
 237                 s += strlen(cpp[i]) + 1;
 238         if ((cp = malloc(s + 1)) == NULL)
 239                 abort();
 240         for (i = 0, *cp = '\0'; cpp[i] != NULL; i++) {
 241                 strcat(cp, cpp[i]);
 242                 strcat(cp, ":");
 243         }
 244         cp[s - 1] = '\0';               /* eliminate last colon */
 245
 246         return (cp);
 247 }
 248
 249 /*
 250  * Provide defaults for all options and directory lists.
 251  */
 252 void
 253 defaults(void)
 254 {
 255         size_t s;
 256         char *b, buf[BUFSIZ], *cp;
 257         int nele;
 258         FILE *p;
 259         DIR *dir;
 260         struct stat sb;
 261         struct dirent *dirp;
 262
 263         /* default to -bms if none has been specified */
 264         if (!opt_b && !opt_m && !opt_s)
 265                 opt_b = opt_m = opt_s = 1;
 266
 267         /* -b defaults to default path + /usr/libexec +
 268          * /usr/games + user's path */
 269         if (!bindirs) {
 270                 if (sysctlbyname("user.cs_path", NULL, &s, NULL, 0) == -1)
 271                         err(EX_OSERR, "sysctlbyname(\"user.cs_path\")");
 272                 if ((b = malloc(s + 1)) == NULL)
 273                         abort();
 274                 if (sysctlbyname("user.cs_path", b, &s, NULL, 0) == -1)
 275                         err(EX_OSERR, "sysctlbyname(\"user.cs_path\")");
 276                 nele = 0;
 277                 decolonify(b, &bindirs, &nele);
 278                 bindirs = realloc(bindirs, (nele + 3) * sizeof(char *));
 279                 if (bindirs == NULL)
 280                         abort();
 281                 bindirs[nele++] = PATH_LIBEXEC;
 282                 bindirs[nele++] = PATH_GAMES;
 283                 bindirs[nele] = NULL;
 284                 if ((cp = getenv("PATH")) != NULL) {
 285                         /* don't destroy the original environment... */
 286                         if ((b = malloc(strlen(cp) + 1)) == NULL)
 287                                 abort();
 288                         strcpy(b, cp);
 289                         decolonify(b, &bindirs, &nele);
 290                 }
 291         }
 292
 293         /* -m defaults to $(manpath) */
 294         if (!mandirs) {
 295                 if ((p = popen(MANPATHCMD, "r")) == NULL)
 296                         err(EX_OSERR, "cannot execute manpath command");
 297                 if (fgets(buf, BUFSIZ - 1, p) == NULL ||
 298                     pclose(p))
 299                         err(EX_OSERR, "error processing manpath results");
 300                 if ((b = strchr(buf, '\n')) != NULL)
 301                         *b = '\0';
 302                 if ((b = malloc(strlen(buf) + 1)) == NULL)
 303                         abort();
 304                 strcpy(b, buf);
 305                 nele = 0;
 306                 decolonify(b, &mandirs, &nele);
 307         }
 308
 309         /* -s defaults to precompiled list, plus subdirs of /usr/pkgsrc */
 310         if (!sourcedirs) {
 311                 if ((b = malloc(strlen(sourcepath) + 1)) == NULL)
 312                         abort();
 313                 strcpy(b, sourcepath);
 314                 nele = 0;
 315                 decolonify(b, &sourcedirs, &nele);
 316
 317                 if (stat(PATH_PKGSRC, &sb) == -1) {
 318                         if (errno == ENOENT)
 319                                 /* no /usr/pkgsrc, we are done */
 320                                 return;
 321                         err(EX_OSERR, "stat(" PATH_PKGSRC ")");
 322                 }
 323                 if ((sb.st_mode & S_IFMT) != S_IFDIR)
 324                         /* /usr/pkgsrc is not a directory, ignore */
 325                         return;
 326                 if (access(PATH_PKGSRC, R_OK | X_OK) != 0)
 327                         return;
 328                 if ((dir = opendir(PATH_PKGSRC)) == NULL)
 329                         err(EX_OSERR, "opendir" PATH_PKGSRC ")");
 330                 while ((dirp = readdir(dir)) != NULL) {
 331                         if (dirp->d_name[0] == '.' ||
 332                             strcmp(dirp->d_name, "CVS") == 0)
 333                                 /* ignore dot entries and CVS subdir */
 334                                 continue;
 335                         if ((b = malloc(sizeof PATH_PKGSRC + 1 + dirp->d_namlen))
 336                             == NULL)
 337                                 abort();
 338                         strcpy(b, PATH_PKGSRC);
 339                         strcat(b, "/");
 340                         strcat(b, dirp->d_name);
 341                         if (stat(b, &sb) == -1 ||
 342                             (sb.st_mode & S_IFMT) != S_IFDIR ||
 343                             access(b, R_OK | X_OK) != 0) {
 344                                 free(b);
 345                                 continue;
 346                         }
 347                         sourcedirs = realloc(sourcedirs,
 348                                              (nele + 2) * sizeof(char *));
 349                         if (sourcedirs == NULL)
 350                                 abort();
 351                         sourcedirs[nele++] = b;
 352                         sourcedirs[nele] = NULL;
 353                 }
 354                 closedir(dir);
 355         }
 356 }
 357
 358 int
 359 main(int argc, char **argv)
 360 {
 361         int unusual, i, printed;
 362         char *bin, buf[BUFSIZ], *cp, *cp2, *man, *name, *src;
 363         ccharp *dp;
 364         size_t nlen, olen, s;
 365         struct stat sb;
 366         regex_t re, re2;
 367         regmatch_t matches[2];
 368         regoff_t rlen;
 369         FILE *p;
 370
 371         setlocale(LC_ALL, "");
 372         scanopts(argc, argv);
 373         defaults();
 374
 375         if (mandirs == NULL)
 376                 opt_m = 0;
 377         if (bindirs == NULL)
 378                 opt_b = 0;
 379         if (sourcedirs == NULL)
 380                 opt_s = 0;
 381         if (opt_m + opt_b + opt_s == 0)
 382                 errx(EX_DATAERR, "no directories to search");
 383
 384         if (opt_m) {
 385                 if (setenv("MANPATH", colonify(mandirs), 1) == -1)
 386                         err(1, "setenv: cannot set MANPATH=%s", colonify(mandirs));
 387                 if ((i = regcomp(&re, MANWHEREISMATCH, REG_EXTENDED)) != 0) {
 388                         regerror(i, &re, buf, BUFSIZ - 1);
 389                         errx(EX_UNAVAILABLE, "regcomp(%s) failed: %s",
 390                              MANWHEREISMATCH, buf);
 391                 }
 392         }
 393
 394         for (; (name = *query) != NULL; query++) {
 395                 /* strip leading path name component */
 396                 if ((cp = strrchr(name, '/')) != NULL)
 397                         name = cp + 1;
 398                 /* strip SCCS or RCS suffix/prefix */
 399                 if (strlen(name) > 2 && strncmp(name, "s.", 2) == 0)
 400                         name += 2;
 401                 if ((s = strlen(name)) > 2 && strcmp(name + s - 2, ",v") == 0)
 402                         name[s - 2] = '\0';
 403                 /* compression suffix */
 404                 s = strlen(name);
 405                 if (s > 2 &&
 406                     (strcmp(name + s - 2, ".z") == 0 ||
 407                      strcmp(name + s - 2, ".Z") == 0))
 408                         name[s - 2] = '\0';
 409                 else if (s > 3 &&
 410                          strcmp(name + s - 3, ".gz") == 0)
 411                         name[s - 3] = '\0';
 412                 else if (s > 4 &&
 413                          strcmp(name + s - 4, ".bz2") == 0)
 414                         name[s - 4] = '\0';
 415
 416                 unusual = 0;
 417                 bin = man = src = NULL;
 418                 s = strlen(name);
 419
 420                 if (opt_b) {
 421                         /*
 422                          * Binaries have to match exactly, and must be regular
 423                          * executable files.
 424                          */
 425                         unusual = unusual | NO_BIN_FOUND;
 426                         for (dp = bindirs; *dp != NULL; dp++) {
 427                                 cp = malloc(strlen(*dp) + 1 + s + 1);
 428                                 if (cp == NULL)
 429                                         abort();
 430                                 strcpy(cp, *dp);
 431                                 strcat(cp, "/");
 432                                 strcat(cp, name);
 433                                 if (stat(cp, &sb) == 0 &&
 434                                     (sb.st_mode & S_IFMT) == S_IFREG &&
 435                                     (sb.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))
 436                                     != 0) {
 437                                         unusual = unusual & ~NO_BIN_FOUND;
 438                                         if (bin == NULL) {
 439                                                 bin = strdup(cp);
 440                                         } else {
 441                                                 olen = strlen(bin);
 442                                                 nlen = strlen(cp);
 443                                                 bin = realloc(bin,
 444                                                               olen + nlen + 2);
 445                                                 if (bin == 0)
 446                                                         abort();
 447                                                 strcat(bin, " ");
 448                                                 strcat(bin, cp);
 449                                         }
 450                                         if (!opt_a) {
 451                                                 free(cp);
 452                                                 break;
 453                                         }
 454                                 }
 455                                 free(cp);
 456                         }
 457                 }
 458
 459                 if (opt_m) {
 460                         /*
 461                          * Ask the man command to perform the search for us.
 462                          */
 463                         unusual = unusual | NO_MAN_FOUND;
 464                         if (opt_a)
 465                                 cp = malloc(sizeof MANWHEREISALLCMD - 2 + s);
 466                         else
 467                                 cp = malloc(sizeof MANWHEREISCMD - 2 + s);
 468
 469                         if (cp == NULL)
 470                                 abort();
 471
 472                         if (opt_a)
 473                                 sprintf(cp, MANWHEREISALLCMD, name);
 474                         else
 475                                 sprintf(cp, MANWHEREISCMD, name);
 476
 477                         if ((p = popen(cp, "r")) != NULL) {
 478
 479                                 while (fgets(buf, BUFSIZ - 1, p) != NULL) {
 480                                         unusual = unusual & ~NO_MAN_FOUND;
 481
 482                                         if ((cp2 = strchr(buf, '\n')) != NULL)
 483                                                 *cp2 = '\0';
 484                                         if (regexec(&re, buf, 2,
 485                                                     matches, 0) == 0 &&
 486                                             (rlen = matches[1].rm_eo -
 487                                              matches[1].rm_so) > 0) {
 488                                                 /*
 489                                                  * man -w found formated
 490                                                  * page, need to pick up
 491                                                  * source page name.
 492                                                  */
 493                                                 cp2 = malloc(rlen + 1);
 494                                                 if (cp2 == NULL)
 495                                                         abort();
 496                                                 memcpy(cp2,
 497                                                        buf + matches[1].rm_so,
 498                                                        rlen);
 499                                                 cp2[rlen] = '\0';
 500                                         } else {
 501                                                 /*
 502                                                  * man -w found plain source
 503                                                  * page, use it.
 504                                                  */
 505                                                 s = strlen(buf);
 506                                                 cp2 = malloc(s + 1);
 507                                                 if (cp2 == NULL)
 508                                                         abort();
 509                                                 strcpy(cp2, buf);
 510                                         }
 511
 512                                         if (man == NULL) {
 513                                                 man = strdup(cp2);
 514                                         } else {
 515                                                 olen = strlen(man);
 516                                                 nlen = strlen(cp2);
 517                                                 man = realloc(man,
 518                                                               olen + nlen + 2);
 519                                                 if (man == 0)
 520                                                         abort();
 521                                                 strcat(man, " ");
 522                                                 strcat(man, cp2);
 523                                         }
 524
 525                                         free(cp2);
 526
 527                                         if (!opt_a)
 528                                                 break;
 529                                 }
 530                                 pclose(p);
 531                                 free(cp);
 532                         }
 533                 }
 534
 535                 if (opt_s) {
 536                         /*
 537                          * Sources match if a subdir with the exact
 538                          * name is found.
 539                          */
 540                         unusual = unusual | NO_SRC_FOUND;
 541                         for (dp = sourcedirs; *dp != NULL; dp++) {
 542                                 cp = malloc(strlen(*dp) + 1 + s + 1);
 543                                 if (cp == NULL)
 544                                         abort();
 545                                 strcpy(cp, *dp);
 546                                 strcat(cp, "/");
 547                                 strcat(cp, name);
 548                                 if (stat(cp, &sb) == 0 &&
 549                                     (sb.st_mode & S_IFMT) == S_IFDIR) {
 550                                         unusual = unusual & ~NO_SRC_FOUND;
 551                                         if (src == NULL) {
 552                                                 src = strdup(cp);
 553                                         } else {
 554                                                 olen = strlen(src);
 555                                                 nlen = strlen(cp);
 556                                                 src = realloc(src,
 557                                                               olen + nlen + 2);
 558                                                 if (src == 0)
 559                                                         abort();
 560                                                 strcat(src, " ");
 561                                                 strcat(src, cp);
 562                                         }
 563                                         if (!opt_a) {
 564                                                 free(cp);
 565                                                 break;
 566                                         }
 567                                 }
 568                                 free(cp);
 569                         }
 570                         /*
 571                          * If still not found, ask locate to search it
 572                          * for us.  This will find sources for things
 573                          * like lpr that are well hidden in the
 574                          * /usr/src tree, but takes a lot longer.
 575                          * Thus, option -x (`expensive') prevents this
 576                          * search.
 577                          *
 578                          * Do only match locate output that starts
 579                          * with one of our source directories, and at
 580                          * least one further level of subdirectories.
 581                          */
 582                         if (opt_x || (src && !opt_a))
 583                                 goto done_sources;
 584
 585                         cp = malloc(sizeof LOCATECMD - 2 + s);
 586                         if (cp == NULL)
 587                                 abort();
 588                         sprintf(cp, LOCATECMD, name);
 589                         if ((p = popen(cp, "r")) == NULL)
 590                                 goto done_sources;
 591                         while ((src == NULL || opt_a) &&
 592                                (fgets(buf, BUFSIZ - 1, p)) != NULL) {
 593                                 if ((cp2 = strchr(buf, '\n')) != NULL)
 594                                         *cp2 = '\0';
 595                                 for (dp = sourcedirs;
 596                                      (src == NULL || opt_a) && *dp != NULL;
 597                                      dp++) {
 598                                         cp2 = malloc(strlen(*dp) + 9);
 599                                         if (cp2 == NULL)
 600                                                 abort();
 601                                         strcpy(cp2, "^");
 602                                         strcat(cp2, *dp);
 603                                         strcat(cp2, "/[^/]+/");
 604                                         if ((i = regcomp(&re2, cp2,
 605                                                          REG_EXTENDED|REG_NOSUB))
 606                                             != 0) {
 607                                                 regerror(i, &re, buf,
 608                                                          BUFSIZ - 1);
 609                                                 errx(EX_UNAVAILABLE,
 610                                                      "regcomp(%s) failed: %s",
 611                                                      cp2, buf);
 612                                         }
 613                                         free(cp2);
 614                                         if (regexec(&re2, buf, 0,
 615                                                     (regmatch_t *)NULL, 0)
 616                                             == 0) {
 617                                                 unusual = unusual &
 618                                                           ~NO_SRC_FOUND;
 619                                                 if (src == NULL) {
 620                                                         src = strdup(buf);
 621                                                 } else {
 622                                                         olen = strlen(src);
 623                                                         nlen = strlen(buf);
 624                                                         src = realloc(src,
 625                                                                       olen +
 626                                                                       nlen + 2);
 627                                                         if (src == 0)
 628                                                                 abort();
 629                                                         strcat(src, " ");
 630                                                         strcat(src, buf);
 631                                                 }
 632                                         }
 633                                         regfree(&re2);
 634                                 }
 635                         }
 636                         pclose(p);
 637                         free(cp);
 638                 }
 639           done_sources:
 640
 641                 if (opt_u && !unusual)
 642                         continue;
 643
 644                 printed = 0;
 645                 if (!opt_q) {
 646                         printf("%s:", name);
 647                         printed++;
 648                 }
 649                 if (bin) {
 650                         if (printed++)
 651                                 putchar(' ');
 652                         fputs(bin, stdout);
 653                 }
 654                 if (man) {
 655                         if (printed++)
 656                                 putchar(' ');
 657                         fputs(man, stdout);
 658                 }
 659                 if (src) {
 660                         if (printed++)
 661                                 putchar(' ');
 662                         fputs(src, stdout);
 663                 }
 664                 if (printed)
 665                         putchar('\n');
 666         }
 667
 668         if (opt_m)
 669                 regfree(&re);
 670
 671         return (0);
 672 }