restore/main.c

   1 /*
   2  *      Ported to Linux's Second Extended File System as part of the
   3  *      dump and restore backup suit
   4  *      Remy Card <card@Linux.EU.Org>, 1994-1997
   5  *      Stelian Pop <stelian@popies.net>, 1999-2000
   6  *      Stelian Pop <stelian@popies.net> - Alcôve <www.alcove.com>, 2000-2002
   7  */
   8
   9 /*
  10  * Copyright (c) 1983, 1993
  11  *      The Regents of the University of California.  All rights reserved.
  12  *
  13  * Redistribution and use in source and binary forms, with or without
  14  * modification, are permitted provided that the following conditions
  15  * are met:
  16  * 1. Redistributions of source code must retain the above copyright
  17  *    notice, this list of conditions and the following disclaimer.
  18  * 2. Redistributions in binary form must reproduce the above copyright
  19  *    notice, this list of conditions and the following disclaimer in the
  20  *    documentation and/or other materials provided with the distribution.
  21  * 3. All advertising materials mentioning features or use of this software
  22  *    must display the following acknowledgement:
  23  *      This product includes software developed by the University of
  24  *      California, Berkeley and its contributors.
  25  * 4. Neither the name of the University nor the names of its contributors
  26  *    may be used to endorse or promote products derived from this software
  27  *    without specific prior written permission.
  28  *
  29  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  30  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  31  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  32  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  33  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  34  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  35  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  36  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  37  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  38  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  39  * SUCH DAMAGE.
  40  */
  41
  42 #ifndef lint
  43 static const char rcsid[] =
  44         "$Id: main.c,v 1.37 2002/01/25 14:59:53 stelian Exp $";
  45 #endif /* not lint */
  46
  47 #include <config.h>
  48 #include <compatlfs.h>
  49 #include <sys/param.h>
  50 #include <sys/stat.h>
  51 #include <errno.h>
  52
  53 #ifdef  __linux__
  54 #include <sys/time.h>
  55 #include <time.h>
  56 #ifdef HAVE_EXT2FS_EXT2_FS_H
  57 #include <ext2fs/ext2_fs.h>
  58 #else
  59 #include <linux/ext2_fs.h>
  60 #endif
  61 #include <bsdcompat.h>
  62 #include <signal.h>
  63 #include <string.h>
  64 #else   /* __linux__ */
  65 #include <ufs/ufs/dinode.h>
  66 #endif  /* __linux__ */
  67 #include <protocols/dumprestore.h>
  68
  69 #include <compaterr.h>
  70 #include <stdio.h>
  71 #include <stdlib.h>
  72 #include <unistd.h>
  73
  74 #ifdef  __linux__
  75 #include <ext2fs/ext2fs.h>
  76 #include <getopt.h>
  77 #endif
  78
  79 #include "pathnames.h"
  80 #include "restore.h"
  81 #include "extern.h"
  82
  83 int     aflag = 0, bflag = 0, cvtflag = 0, dflag = 0, vflag = 0, yflag = 0;
  84 int     hflag = 1, mflag = 1, Mflag = 0, Nflag = 0, Vflag = 0, zflag = 0;
  85 int     uflag = 0, lflag = 0, Lflag = 0;
  86 char    *Afile = NULL;
  87 int     dokerberos = 0;
  88 char    command = '\0';
  89 long    dumpnum = 1;
  90 long    volno = 0;
  91 long    ntrec;
  92 char    *dumpmap;
  93 char    *usedinomap;
  94 dump_ino_t maxino;
  95 time_t  dumptime;
  96 time_t  dumpdate;
  97 FILE    *terminal;
  98 char    *tmpdir;
  99 int     compare_ignore_not_found;
 100 int     compare_errors;
 101 char    filesys[NAMELEN];
 102 static const char *stdin_opt = NULL;
 103 char    *bot_script = NULL;
 104 dump_ino_t volinfo[TP_NINOS];
 105
 106 #ifdef USE_QFA
 107 FILE    *gTapeposfp;
 108 char    *gTapeposfile;
 109 char    gTps[255];
 110 long    gSeekstart;
 111 int     tapeposflag;
 112 #endif /* USE_QFA */
 113
 114 #ifdef  __linux__
 115 char    *__progname;
 116 #endif
 117
 118 static void obsolete __P((int *, char **[]));
 119 static void usage __P((void));
 120 static void use_stdin __P((const char *));
 121
 122 int
 123 main(int argc, char *argv[])
 124 {
 125         int ch;
 126         dump_ino_t ino;
 127         char *inputdev = _PATH_DEFTAPE;
 128         char *symtbl = "./restoresymtable";
 129         char *p, name[MAXPATHLEN];
 130         FILE *filelist = NULL;
 131         char fname[MAXPATHLEN];
 132 #ifdef USE_QFA
 133         tapeposflag = 0;
 134 #endif
 135 #ifdef USE_QFADEBUG
 136         time_t tistart, tiend, titaken;
 137 #endif
 138
 139         /* Temp files should *not* be readable.  We set permissions later. */
 140         (void) umask(077);
 141         filesys[0] = '\0';
 142 #ifdef  __linux__
 143         __progname = argv[0];
 144 #endif
 145
 146         if (argc < 2)
 147                 usage();
 148
 149         if ((inputdev = getenv("TAPE")) == NULL)
 150                 inputdev = _PATH_DEFTAPE;
 151         if ((tmpdir = getenv("TMPDIR")) == NULL)
 152                 tmpdir = _PATH_TMP;
 153         if ((tmpdir = strdup(tmpdir)) == NULL)
 154                 err(1, "malloc tmpdir");
 155         for (p = tmpdir + strlen(tmpdir) - 1; p >= tmpdir && *p == '/'; p--)
 156                 ;
 157         obsolete(&argc, &argv);
 158         while ((ch = getopt(argc, argv,
 159                 "aA:b:CcdD:f:F:hi"
 160 #ifdef KERBEROS
 161                 "k"
 162 #endif
 163                 "lL:mMN"
 164 #ifdef USE_QFA
 165                 "Q:"
 166 #endif
 167                 "Rrs:tT:uvVxX:y")) != -1)
 168                 switch(ch) {
 169                 case 'a':
 170                         aflag = 1;
 171                         break;
 172                 case 'A':
 173                         Afile = optarg;
 174                         aflag = 1;
 175                         break;
 176                 case 'b':
 177                         /* Change default tape blocksize. */
 178                         bflag = 1;
 179                         ntrec = strtol(optarg, &p, 10);
 180                         if (*p)
 181                                 errx(1, "illegal blocksize -- %s", optarg);
 182                         if (ntrec <= 0)
 183                                 errx(1, "block size must be greater than 0");
 184                         break;
 185                 case 'c':
 186                         cvtflag = 1;
 187                         break;
 188                 case 'D':
 189                         strncpy(filesys, optarg, NAMELEN);
 190                         filesys[NAMELEN - 1] = '\0';
 191                         break;
 192                 case 'T':
 193                         tmpdir = optarg;
 194                         break;
 195                 case 'd':
 196                         dflag = 1;
 197                         break;
 198                 case 'f':
 199                         if( !strcmp(optarg,"-") )
 200                                 use_stdin("-f");
 201                         inputdev = optarg;
 202                         break;
 203                 case 'F':
 204                         bot_script = optarg;
 205                         break;
 206                 case 'h':
 207                         hflag = 0;
 208                         break;
 209 #ifdef KERBEROS
 210                 case 'k':
 211                         dokerberos = 1;
 212                         break;
 213 #endif
 214                 case 'C':
 215                 case 'i':
 216                 case 'R':
 217                 case 'r':
 218                 case 't':
 219                 case 'x':
 220                         if (command != '\0')
 221                                 errx(1,
 222                                     "%c and %c options are mutually exclusive",
 223                                     ch, command);
 224                         command = ch;
 225                         break;
 226                 case 'l':
 227                         lflag = 1;
 228                         break;
 229                 case 'L':
 230                         Lflag = strtol(optarg, &p, 10);
 231                         if (*p)
 232                                 errx(1, "illegal limit -- %s", optarg);
 233                         if (Lflag < 0)
 234                                 errx(1, "limit must be greater than 0");
 235                         break;
 236                 case 'm':
 237                         mflag = 0;
 238                         break;
 239                 case 'M':
 240                         Mflag = 1;
 241                         break;
 242                 case 'N':
 243                         Nflag = 1;
 244                         break;
 245 #ifdef USE_QFA
 246                 case 'Q':
 247                         gTapeposfile = optarg;
 248                         tapeposflag = 1;
 249                         aflag = 1;
 250                         break;
 251 #endif
 252                 case 's':
 253                         /* Dumpnum (skip to) for multifile dump tapes. */
 254                         dumpnum = strtol(optarg, &p, 10);
 255                         if (*p)
 256                                 errx(1, "illegal dump number -- %s", optarg);
 257                         if (dumpnum <= 0)
 258                                 errx(1, "dump number must be greater than 0");
 259                         break;
 260                 case 'u':
 261                         uflag = 1;
 262                         break;
 263                 case 'v':
 264                         vflag = 1;
 265                         break;
 266                 case 'V':
 267                         Vflag = 1;
 268                         break;
 269                 case 'X':
 270                         if( !strcmp(optarg,"-") ) {
 271                                 use_stdin("-X");
 272                                 filelist = stdin;
 273                         }
 274                         else
 275                                 if ( !(filelist = fopen(optarg,"r")) )
 276                                         errx(1, "can't open file for reading -- %s", optarg);
 277                         break;
 278                 case 'y':
 279                         yflag = 1;
 280                         break;
 281                 default:
 282                         usage();
 283                 }
 284         argc -= optind;
 285         argv += optind;
 286
 287         if (command == '\0')
 288                 errx(1, "none of C, i, R, r, t or x options specified");
 289
 290 #ifdef USE_QFA
 291         if (!mflag && tapeposflag)
 292                 errx(1, "m and Q options are mutually exclusive");
 293
 294         if (tapeposflag && command != 'i' && command != 'x' && command != 't')
 295                 errx(1, "Q option is not valid for %c command", command);
 296 #endif
 297
 298         if (Afile && command != 'i' && command != 'x' && command != 't')
 299                 errx(1, "A option is not valid for %c command", command);
 300
 301         if (signal(SIGINT, onintr) == SIG_IGN)
 302                 (void) signal(SIGINT, SIG_IGN);
 303         if (signal(SIGTERM, onintr) == SIG_IGN)
 304                 (void) signal(SIGTERM, SIG_IGN);
 305         setlinebuf(stderr);
 306
 307         atexit(cleanup);
 308
 309         if (command == 'C' && inputdev[0] != '/' && strcmp(inputdev, "-")
 310 #ifdef RRESTORE
 311             && !strchr(inputdev, ':')
 312 #endif
 313           ) {
 314                 /* since we chdir into the directory we are comparing
 315                  * to, we must retain the full tape path */
 316                 char wd[MAXPATHLEN], fullpathinput[MAXPATHLEN];
 317                 if (!getcwd(wd, MAXPATHLEN))
 318                         err(1, "can't get current directory");
 319                 snprintf(fullpathinput, MAXPATHLEN, "%s/%s", wd, inputdev);
 320                 fullpathinput[MAXPATHLEN - 1] = '\0';
 321                 setinput(fullpathinput);
 322         }
 323         else
 324                 setinput(inputdev);
 325
 326         if (argc == 0 && !filelist) {
 327                 argc = 1;
 328                 *--argv = ".";
 329         }
 330
 331 #ifdef USE_QFA
 332         if (tapeposflag) {
 333                 msg("reading QFA positions from %s\n", gTapeposfile);
 334                 if ((gTapeposfp = fopen(gTapeposfile, "r")) == NULL)
 335                         errx(1, "can't open file for reading -- %s",
 336                                 gTapeposfile);
 337                 /* start reading header info */
 338                 if (fgets(gTps, sizeof(gTps), gTapeposfp) == NULL)
 339                         errx(1, "not requested format of -- %s", gTapeposfile);
 340                 gTps[strlen(gTps) - 1] = 0;     /* delete end of line */
 341                 if (strcmp(gTps, QFA_MAGIC) != 0)
 342                         errx(1, "not requested format of -- %s", gTapeposfile);
 343                 if (fgets(gTps, sizeof(gTps), gTapeposfp) == NULL)
 344                         errx(1, "not requested format of -- %s", gTapeposfile);
 345                 gTps[strlen(gTps) - 1] = 0;
 346                 if (strcmp(gTps, QFA_VERSION) != 0)
 347                         errx(1, "not requested format of -- %s", gTapeposfile);
 348                 /* read dumpdate */
 349                 if (fgets(gTps, sizeof(gTps), gTapeposfp) == NULL)
 350                         errx(1, "not requested format of -- %s", gTapeposfile);
 351                 gTps[strlen(gTps) - 1] = 0;
 352                 /* TODO: check dumpdate from QFA file with current dump file's
 353                  * dump date */
 354                 /* if not equal either output warning and continue without QFA
 355                  * or abort */
 356                 /* read empty line */
 357                 if (fgets(gTps, sizeof(gTps), gTapeposfp) == NULL)
 358                         errx(1, "not requested format of -- %s", gTapeposfile);
 359                 gTps[strlen(gTps) - 1] = 0;
 360                 /* read table header line */
 361                 if (fgets(gTps, sizeof(gTps), gTapeposfp) == NULL)
 362                         errx(1, "not requested format of -- %s", gTapeposfile);
 363                 gTps[strlen(gTps) - 1] = 0;
 364                 /* end reading header info */
 365                 /* tape position table starts here */
 366                 gSeekstart = ftell(gTapeposfp); /* remember for later use */
 367 }
 368 #endif /* USE_QFA */
 369
 370         switch (command) {
 371         /*
 372          * Compare contents of tape.
 373          */
 374         case 'C': {
 375                 struct STAT stbuf;
 376
 377                 Vprintf(stdout, "Begin compare restore\n");
 378                 compare_ignore_not_found = 0;
 379                 compare_errors = 0;
 380                 setup();
 381                 printf("filesys = %s\n", filesys);
 382                 if (STAT(filesys, &stbuf) < 0)
 383                         err(1, "cannot stat directory %s", filesys);
 384                 if (chdir(filesys) < 0)
 385                         err(1, "cannot cd to %s", filesys);
 386                 compare_ignore_not_found = dumptime > 0;
 387                 initsymtable((char *)0);
 388                 extractdirs(0);
 389                 treescan(".", ROOTINO, nodeupdates);
 390                 compareleaves();
 391                 checkrestore();
 392                 if (compare_errors) {
 393                         printf("Some files were modified!\n");
 394                         exit(2);
 395                 }
 396                 break;
 397         }
 398
 399         /*
 400          * Interactive mode.
 401          */
 402         case 'i':
 403                 setup();
 404                 extractdirs(1);
 405                 initsymtable(NULL);
 406                 runcmdshell();
 407                 break;
 408         /*
 409          * Incremental restoration of a file system.
 410          */
 411         case 'r':
 412                 aflag = 1;      /* in -r or -R mode, -a is default */
 413                 setup();
 414                 if (dumptime > 0) {
 415                         /*
 416                          * This is an incremental dump tape.
 417                          */
 418                         Vprintf(stdout, "Begin incremental restore\n");
 419                         initsymtable(symtbl);
 420                         extractdirs(1);
 421                         removeoldleaves();
 422                         Vprintf(stdout, "Calculate node updates.\n");
 423                         treescan(".", ROOTINO, nodeupdates);
 424                         findunreflinks();
 425                         removeoldnodes();
 426                 } else {
 427                         /*
 428                          * This is a level zero dump tape.
 429                          */
 430                         Vprintf(stdout, "Begin level 0 restore\n");
 431                         initsymtable((char *)0);
 432                         extractdirs(1);
 433                         Vprintf(stdout, "Calculate extraction list.\n");
 434                         treescan(".", ROOTINO, nodeupdates);
 435                 }
 436                 createleaves(symtbl);
 437                 createlinks();
 438                 setdirmodes(FORCE);
 439                 checkrestore();
 440                 if (dflag) {
 441                         Vprintf(stdout, "Verify the directory structure\n");
 442                         treescan(".", ROOTINO, verifyfile);
 443                 }
 444                 dumpsymtable(symtbl, (long)1);
 445                 break;
 446         /*
 447          * Resume an incremental file system restoration.
 448          */
 449         case 'R':
 450                 aflag = 1;      /* in -r or -R mode, -a is default */
 451                 initsymtable(symtbl);
 452                 skipmaps();
 453                 skipdirs();
 454                 createleaves(symtbl);
 455                 createlinks();
 456                 setdirmodes(FORCE);
 457                 checkrestore();
 458                 dumpsymtable(symtbl, (long)1);
 459                 break;
 460
 461 /* handle file names from either text file (-X) or the command line */
 462 #define NEXTFILE(p) \
 463         p = NULL; \
 464         if (argc) { \
 465                 --argc; \
 466                 p = *argv++; \
 467         } \
 468         else if (filelist) { \
 469                 if ((p = fgets(fname, MAXPATHLEN, filelist))) { \
 470                         if ( *p && *(p + strlen(p) - 1) == '\n' ) /* possible null string */ \
 471                                 *(p + strlen(p) - 1) = '\0'; \
 472                         if ( !*p ) /* skip empty lines */ \
 473                                 continue; \
 474                         } \
 475         }
 476
 477         /*
 478          * List contents of tape.
 479          */
 480         case 't':
 481                 setup();
 482                 extractdirs(0);
 483                 initsymtable((char *)0);
 484                 printvolinfo();
 485                 for (;;) {
 486                         NEXTFILE(p);
 487                         if (!p)
 488                                 break;
 489                         canon(p, name, sizeof(name));
 490                         ino = dirlookup(name);
 491                         if (ino == 0)
 492                                 continue;
 493                         treescan(name, ino, listfile);
 494                 }
 495                 break;
 496         /*
 497          * Batch extraction of tape contents.
 498          */
 499         case 'x':
 500 #ifdef USE_QFADEBUG
 501                 tistart = time(NULL);
 502 #endif
 503                 setup();
 504                 extractdirs(1);
 505                 initsymtable((char *)0);
 506                 for (;;) {
 507                         NEXTFILE(p);
 508                         if (!p)
 509                                 break;
 510                         canon(p, name, sizeof(name));
 511                         ino = dirlookup(name);
 512                         if (ino == 0)
 513                                 continue;
 514                         if (mflag)
 515                                 pathcheck(name);
 516                         treescan(name, ino, addfile);
 517                 }
 518                 createfiles();
 519                 createlinks();
 520                 setdirmodes(0);
 521                 if (dflag)
 522                         checkrestore();
 523 #ifdef USE_QFADEBUG
 524                 tiend = time(NULL);
 525                 titaken = tiend - tistart;
 526                 msg("restore took %d:%02d:%02d\n", titaken / 3600,
 527                         (titaken % 3600) / 60, titaken % 60);
 528 #endif /* USE_QFADEBUG */
 529                 break;
 530         }
 531         exit(0);
 532         /* NOTREACHED */
 533         return 0;       /* gcc shut up */
 534 }
 535
 536 static void
 537 usage(void)
 538 {
 539         char white[MAXPATHLEN];
 540         const char *ext2ver, *ext2date;
 541
 542         memset(white, ' ', MAXPATHLEN);
 543         white[MIN(strlen(__progname), MAXPATHLEN - 1)] = '\0';
 544
 545 #ifdef __linux__
 546         ext2fs_get_library_version(&ext2ver, &ext2date);
 547         (void)fprintf(stderr, "%s %s (using libext2fs %s of %s)\n",
 548                       __progname, _DUMP_VERSION, ext2ver, ext2date);
 549 #else
 550         (void)fprintf(stderr, "%s %s\n", __progname, _DUMP_VERSION);
 551 #endif
 552
 553 #ifdef KERBEROS
 554 #define kerbflag "k"
 555 #else
 556 #define kerbflag
 557 #endif
 558
 559 #ifdef USE_QFA
 560 #define qfaflag "[-Q file] "
 561 #else
 562 #define qfaflag
 563 #endif
 564
 565         fprintf(stderr,
 566                 "usage:"
 567                 "\t%s -C [-c" kerbflag "lMvVy] [-b blocksize] [-D filesystem] [-f file]\n"
 568                 "\t%s    [-F script] [-L limit] [-s fileno]\n"
 569                 "\t%s -i [-ach" kerbflag "lmMuvVy] [-A file] [-b blocksize] [-f file]\n"
 570                 "\t%s    [-F script] " qfaflag "[-s fileno]\n"
 571                 "\t%s -r [-c" kerbflag "lMuvVy] [-b blocksize] [-f file] [-F script]\n"
 572                 "\t%s    [-s fileno] [-T directory]\n"
 573                 "\t%s -R [-c" kerbflag "lMuvVy] [-b blocksize] [-f file] [-F script]\n"
 574                 "\t%s    [-s fileno] [-T directory]\n"
 575                 "\t%s -t [-ch" kerbflag "lMuvVy] [-A file] [-b blocksize] [-f file]\n"
 576                 "\t%s    [-F script] " qfaflag "[-s fileno] [-X filelist] [file ...]\n"
 577                 "\t%s -x [-ach" kerbflag "lmMuvVy] [-A file] [-b blocksize] [-f file]\n"
 578                 "\t%s    [-F script] " qfaflag "[-s fileno] [-X filelist] [file ...]\n",
 579                 __progname, white,
 580                 __progname, white,
 581                 __progname, white,
 582                 __progname, white,
 583                 __progname, white,
 584                 __progname, white);
 585         exit(1);
 586 }
 587
 588 /*
 589  * obsolete --
 590  *      Change set of key letters and ordered arguments into something
 591  *      getopt(3) will like.
 592  */
 593 static void
 594 obsolete(int *argcp, char **argvp[])
 595 {
 596         int argc, flags;
 597         char *ap, **argv, *flagsp = NULL, **nargv, *p = NULL;
 598
 599         /* Setup. */
 600         argv = *argvp;
 601         argc = *argcp;
 602
 603         /* Return if no arguments or first argument has leading dash. */
 604         ap = argv[1];
 605         if (argc == 1 || *ap == '-')
 606                 return;
 607
 608         /* Allocate space for new arguments. */
 609         if ((*argvp = nargv = malloc((argc + 1) * sizeof(char *))) == NULL ||
 610             (p = flagsp = malloc(strlen(ap) + 2)) == NULL)
 611                 err(1, "malloc args");
 612
 613         *nargv++ = *argv;
 614         argv += 2, argc -= 2;
 615
 616         for (flags = 0; *ap; ++ap) {
 617                 switch (*ap) {
 618                 case 'A':
 619                 case 'b':
 620                 case 'D':
 621                 case 'f':
 622                 case 'F':
 623                 case 'L':
 624                 case 'Q':
 625                 case 's':
 626                 case 'T':
 627                 case 'X':
 628                         if (*argv == NULL) {
 629                                 warnx("option requires an argument -- %c", *ap);
 630                                 usage();
 631                         }
 632                         if ((nargv[0] = malloc(strlen(*argv) + 2 + 1)) == NULL)
 633                                 err(1, "malloc arg");
 634                         nargv[0][0] = '-';
 635                         nargv[0][1] = *ap;
 636                         (void)strcpy(&nargv[0][2], *argv);
 637                         ++argv;
 638                         ++nargv;
 639                         break;
 640                 default:
 641                         if (!flags) {
 642                                 *p++ = '-';
 643                                 flags = 1;
 644                         }
 645                         *p++ = *ap;
 646                         break;
 647                 }
 648         }
 649
 650         /* Terminate flags. */
 651         if (flags) {
 652                 *p = '\0';
 653                 *nargv++ = flagsp;
 654         }
 655
 656         /* Copy remaining arguments. */
 657         while ((*nargv++ = *argv++));
 658
 659         /* Update argument count. */
 660         *argcp = nargv - *argvp - 1;
 661 }
 662
 663 /*
 664  * use_stdin --
 665  *      reserve stdin for opt (avoid conflicts)
 666  */
 667 void
 668 use_stdin(const char *opt)
 669 {
 670         if (stdin_opt)
 671                 errx(1, "can't handle standard input for both %s and %s",
 672                         stdin_opt, opt);
 673         stdin_opt = opt;
 674 }