Dogcows Code - chaz/tar/blob - src/tar.c

   1 /* Tar -- a tape archiver.
   2    Copyright (C) 1988, 1992 Free Software Foundation
   3
   4 This file is part of GNU Tar.
   5
   6 GNU Tar is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2, or (at your option)
   9 any later version.
  10
  11 GNU Tar is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU Tar; see the file COPYING.  If not, write to
  18 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
  19
  20 /*
  21  * A tar (tape archiver) program.
  22  *
  23  * Written by John Gilmore, ihnp4!hoptoad!gnu, starting 25 Aug 85.
  24  */
  25
  26 #include <stdio.h>
  27 #include <sys/types.h>          /* Needed for typedefs in tar.h */
  28 #include "getopt.h"
  29 #include "regex.h"
  30 #include "fnmatch.h"
  31
  32 /*
  33  * The following causes "tar.h" to produce definitions of all the
  34  * global variables, rather than just "extern" declarations of them.
  35  */
  36 #define TAR_EXTERN              /**/
  37 #include "tar.h"
  38
  39 #include "port.h"
  40
  41 #if defined(_POSIX_VERSION) || defined(DIRENT)
  42 #include <dirent.h>
  43 #ifdef direct
  44 #undef direct
  45 #endif /* direct */
  46 #define direct dirent
  47 #define DP_NAMELEN(x) strlen((x)->d_name)
  48 #endif /* _POSIX_VERSION or DIRENT */
  49 #if !defined(_POSIX_VERSION) && !defined(DIRENT) && defined(BSD42)
  50 #include <sys/dir.h>
  51 #define DP_NAMELEN(x)   (x)->d_namlen
  52 #endif /* not _POSIX_VERSION and BSD42 */
  53 #ifdef __MSDOS__
  54 #include "msd_dir.h"
  55 #define DP_NAMELEN(x)   (x)->d_namlen
  56 #define direct dirent
  57 #endif
  58 #if defined(USG) && !defined(_POSIX_VERSION) && !defined(DIRENT)
  59 #include <ndir.h>
  60 #define DP_NAMELEN(x) strlen((x)->d_name)
  61 #endif /* USG and not _POSIX_VERSION and not DIRENT */
  62
  63 /*
  64  * We should use a conversion routine that does reasonable error
  65  * checking -- atoi doesn't.  For now, punt.  FIXME.
  66  */
  67 #define intconv atoi
  68 PTR ck_malloc ();
  69 PTR ck_realloc ();
  70 extern int getoldopt ();
  71 extern void read_and ();
  72 extern void list_archive ();
  73 extern void extract_archive ();
  74 extern void diff_archive ();
  75 extern void create_archive ();
  76 extern void update_archive ();
  77 extern void junk_archive ();
  78 extern void init_volume_number ();
  79 extern void closeout_volume_number ();
  80
  81 /* JF */
  82 extern time_t get_date ();
  83
  84 time_t new_time;
  85
  86 static FILE *namef;             /* File to read names from */
  87 static char **n_argv;           /* Argv used by name routines */
  88 static int n_argc;              /* Argc used by name routines */
  89 static char **n_ind;            /* Store an array of names */
  90 static int n_indalloc;          /* How big is the array? */
  91 static int n_indused;           /* How many entries does it have? */
  92 static int n_indscan;           /* How many of the entries have we scanned? */
  93
  94
  95 extern FILE *msg_file;
  96
  97 int check_exclude ();
  98 void add_exclude ();
  99 void add_exclude_file ();
 100 void addname ();
 101 void describe ();
 102 void diff_init ();
 103 void extr_init ();
 104 int is_regex ();
 105 void name_add ();
 106 void name_init ();
 107 void options ();
 108 char *un_quote_string ();
 109
 110 #ifndef S_ISLNK
 111 #define lstat stat
 112 #endif
 113
 114 #ifndef DEFBLOCKING
 115 #define DEFBLOCKING 20
 116 #endif
 117
 118 #ifndef DEF_AR_FILE
 119 #define DEF_AR_FILE "tar.out"
 120 #endif
 121
 122 /* For long options that unconditionally set a single flag, we have getopt
 123    do it.  For the others, we share the code for the equivalent short
 124    named option, the name of which is stored in the otherwise-unused `val'
 125    field of the `struct option'; for long options that have no equivalent
 126    short option, we use nongraphic characters as pseudo short option
 127    characters, starting (for no particular reason) with character 10. */
 128
 129 struct option long_options[] =
 130 {
 131   {"create", 0, 0, 'c'},
 132   {"append", 0, 0, 'r'},
 133   {"extract", 0, 0, 'x'},
 134   {"get", 0, 0, 'x'},
 135   {"list", 0, 0, 't'},
 136   {"update", 0, 0, 'u'},
 137   {"catenate", 0, 0, 'A'},
 138   {"concatenate", 0, 0, 'A'},
 139   {"compare", 0, 0, 'd'},
 140   {"diff", 0, 0, 'd'},
 141   {"delete", 0, 0, 14},
 142   {"help", 0, 0, 12},
 143
 144   {"null", 0, 0, 16},
 145   {"directory", 1, 0, 'C'},
 146   {"record-number", 0, &f_sayblock, 1},
 147   {"files-from", 1, 0, 'T'},
 148   {"label", 1, 0, 'V'},
 149   {"exclude-from", 1, 0, 'X'},
 150   {"exclude", 1, 0, 15},
 151   {"file", 1, 0, 'f'},
 152   {"block-size", 1, 0, 'b'},
 153   {"version", 0, 0, 11},
 154   {"verbose", 0, 0, 'v'},
 155   {"totals", 0, &f_totals, 1},
 156
 157   {"read-full-blocks", 0, &f_reblock, 1},
 158   {"starting-file", 1, 0, 'K'},
 159   {"to-stdout", 0, &f_exstdout, 1},
 160   {"ignore-zeros", 0, &f_ignorez, 1},
 161   {"keep-old-files", 0, 0, 'k'},
 162   {"uncompress", 0, &f_compress, 1},
 163   {"same-permissions", 0, &f_use_protection, 1},
 164   {"preserve-permissions", 0, &f_use_protection, 1},
 165   {"modification-time", 0, &f_modified, 1},
 166   {"preserve", 0, 0, 10},
 167   {"same-order", 0, &f_sorted_names, 1},
 168   {"same-owner", 0, &f_do_chown, 1},
 169   {"preserve-order", 0, &f_sorted_names, 1},
 170
 171   {"newer", 1, 0, 'N'},
 172   {"after-date", 1, 0, 'N'},
 173   {"newer-mtime", 1, 0, 13},
 174   {"incremental", 0, 0, 'G'},
 175   {"listed-incremental", 1, 0, 'g'},
 176   {"multi-volume", 0, &f_multivol, 1},
 177   {"info-script", 1, 0, 'F'},
 178   {"absolute-paths", 0, &f_absolute_paths, 1},
 179   {"interactive", 0, &f_confirm, 1},
 180   {"confirmation", 0, &f_confirm, 1},
 181
 182   {"verify", 0, &f_verify, 1},
 183   {"dereference", 0, &f_follow_links, 1},
 184   {"one-file-system", 0, &f_local_filesys, 1},
 185   {"old-archive", 0, 0, 'o'},
 186   {"portability", 0, 0, 'o'},
 187   {"compress", 0, &f_compress, 1},
 188   {"compress-block", 0, &f_compress, 2},
 189   {"sparse", 0, &f_sparse_files, 1},
 190   {"tape-length", 1, 0, 'L'},
 191   {"remove-files", 0, &f_remove_files, 1},
 192   {"ignore-failed-read", 0, &f_ignore_failed_read, 1},
 193   {"checkpoint", 0, &f_checkpoint, 1},
 194   {"show-omitted-dirs", 0, &f_show_omitted_dirs, 1},
 195   {"volno-file", 1, 0, 17},
 196   {"force-local", 0, &f_force_local, 1},
 197   {"atime-preserve", 0, &f_atime_preserve, 1},
 198
 199   {0, 0, 0, 0}
 200 };
 201
 202 /*
 203  * Main routine for tar.
 204  */
 205 void
 206 main (argc, argv)
 207      int argc;
 208      char **argv;
 209 {
 210   extern char version_string[];
 211
 212   tar = argv[0];                /* JF: was "tar" Set program name */
 213   filename_terminator = '\n';
 214   errors = 0;
 215
 216   options (argc, argv);
 217
 218   if (!n_argv)
 219     name_init (argc, argv);
 220
 221   if (f_volno_file)
 222     init_volume_number ();
 223
 224   switch (cmd_mode)
 225     {
 226     case CMD_CAT:
 227     case CMD_UPDATE:
 228     case CMD_APPEND:
 229       update_archive ();
 230       break;
 231     case CMD_DELETE:
 232       junk_archive ();
 233       break;
 234     case CMD_CREATE:
 235       create_archive ();
 236       if (f_totals)
 237         fprintf (stderr, "Total bytes written: %d\n", tot_written);
 238       break;
 239     case CMD_EXTRACT:
 240       if (f_volhdr)
 241         {
 242           const char *err;
 243           label_pattern = (struct re_pattern_buffer *)
 244             ck_malloc (sizeof *label_pattern);
 245           err = re_compile_pattern (f_volhdr, strlen (f_volhdr),
 246                                     label_pattern);
 247           if (err)
 248             {
 249               fprintf (stderr, "Bad regular expression: %s\n",
 250                        err);
 251               errors++;
 252               break;
 253             }
 254
 255         }
 256       extr_init ();
 257       read_and (extract_archive);
 258       break;
 259     case CMD_LIST:
 260       if (f_volhdr)
 261         {
 262           const char *err;
 263           label_pattern = (struct re_pattern_buffer *)
 264             ck_malloc (sizeof *label_pattern);
 265           err = re_compile_pattern (f_volhdr, strlen (f_volhdr),
 266                                     label_pattern);
 267           if (err)
 268             {
 269               fprintf (stderr, "Bad regular expression: %s\n",
 270                        err);
 271               errors++;
 272               break;
 273             }
 274         }
 275       read_and (list_archive);
 276 #if 0
 277       if (!errors)
 278         errors = different;
 279 #endif
 280       break;
 281     case CMD_DIFF:
 282       diff_init ();
 283       read_and (diff_archive);
 284       break;
 285     case CMD_VERSION:
 286       fprintf (stderr, "%s\n", version_string);
 287       break;
 288     case CMD_NONE:
 289       msg ("you must specify exactly one of the r, c, t, x, or d options\n");
 290       fprintf (stderr, "For more information, type ``%s --help''.\n", tar);
 291       exit (EX_ARGSBAD);
 292     }
 293   if (f_volno_file)
 294     closeout_volume_number ();
 295   exit (errors);
 296   /* NOTREACHED */
 297 }
 298
 299
 300 /*
 301  * Parse the options for tar.
 302  */
 303 void
 304 options (argc, argv)
 305      int argc;
 306      char **argv;
 307 {
 308   register int c;               /* Option letter */
 309   int ind = -1;
 310
 311   /* Set default option values */
 312   blocking = DEFBLOCKING;       /* From Makefile */
 313   ar_files = (char **) malloc (sizeof (char *) * 10);
 314   ar_files_len = 10;
 315   n_ar_files = 0;
 316   cur_ar_file = 0;
 317
 318   /* Parse options */
 319   while ((c = getoldopt (argc, argv,
 320                "-01234567Ab:BcC:df:F:g:GhikK:lL:mMN:oOpPrRsStT:uvV:wWxX:zZ",
 321                          long_options, &ind)) != EOF)
 322     {
 323       switch (c)
 324         {
 325         case 0:         /* long options that set a single flag */
 326           break;
 327         case 1:
 328           /* File name or non-parsed option */
 329           name_add (optarg);
 330           break;
 331         case 'C':
 332           name_add ("-C");
 333           name_add (optarg);
 334           break;
 335         case 10:                /* preserve */
 336           f_use_protection = f_sorted_names = 1;
 337           break;
 338         case 11:
 339           if (cmd_mode != CMD_NONE)
 340             goto badopt;
 341           cmd_mode = CMD_VERSION;
 342           break;
 343         case 12:                /* help */
 344           printf ("This is GNU tar, the tape archiving program.\n");
 345           describe ();
 346           exit (1);
 347         case 13:
 348           f_new_files++;
 349           goto get_newer;
 350
 351         case 14:                /* Delete in the archive */
 352           if (cmd_mode != CMD_NONE)
 353             goto badopt;
 354           cmd_mode = CMD_DELETE;
 355           break;
 356
 357         case 15:
 358           f_exclude++;
 359           add_exclude (optarg);
 360           break;
 361
 362         case 16:                /* -T reads null terminated filenames. */
 363           filename_terminator = '\0';
 364           break;
 365
 366         case 17:
 367           f_volno_file = optarg;
 368           break;
 369
 370         case 'g':               /* We are making a GNU dump; save
 371                                    directories at the beginning of
 372                                    the archive, and include in each
 373                                    directory its contents */
 374           if (f_oldarch)
 375             goto badopt;
 376           f_gnudump++;
 377           gnu_dumpfile = optarg;
 378           break;
 379
 380
 381         case '0':
 382         case '1':
 383         case '2':
 384         case '3':
 385         case '4':
 386         case '5':
 387         case '6':
 388         case '7':
 389           {
 390             /* JF this'll have to be modified for other
 391                                    systems, of course! */
 392             int d, add;
 393             static char buf[50];
 394
 395             d = getoldopt (argc, argv, "lmh");
 396 #ifdef MAYBEDEF
 397             sprintf (buf, "/dev/rmt/%d%c", c, d);
 398 #else
 399 #ifndef LOW_NUM
 400 #define LOW_NUM 0
 401 #define MID_NUM 8
 402 #define HGH_NUM 16
 403 #endif
 404             if (d == 'l')
 405               add = LOW_NUM;
 406             else if (d == 'm')
 407               add = MID_NUM;
 408             else if (d == 'h')
 409               add = HGH_NUM;
 410             else
 411               goto badopt;
 412
 413             sprintf (buf, "/dev/rmt%d", add + c - '0');
 414 #endif
 415             if (n_ar_files == ar_files_len)
 416               ar_files
 417                 = (char **)
 418                 ck_malloc (sizeof (char *)
 419                            * (ar_files_len *= 2));
 420             ar_files[n_ar_files++] = buf;
 421           }
 422           break;
 423
 424         case 'A':               /* Arguments are tar files,
 425                                    just cat them onto the end
 426                                    of the archive.  */
 427           if (cmd_mode != CMD_NONE)
 428             goto badopt;
 429           cmd_mode = CMD_CAT;
 430           break;
 431
 432         case 'b':               /* Set blocking factor */
 433           blocking = intconv (optarg);
 434           break;
 435
 436         case 'B':               /* Try to reblock input */
 437           f_reblock++;          /* For reading 4.2BSD pipes */
 438           break;
 439
 440         case 'c':               /* Create an archive */
 441           if (cmd_mode != CMD_NONE)
 442             goto badopt;
 443           cmd_mode = CMD_CREATE;
 444           break;
 445
 446 #if 0
 447         case 'C':
 448           if (chdir (optarg) < 0)
 449             msg_perror ("Can't change directory to %d", optarg);
 450           break;
 451 #endif
 452
 453         case 'd':               /* Find difference tape/disk */
 454           if (cmd_mode != CMD_NONE)
 455             goto badopt;
 456           cmd_mode = CMD_DIFF;
 457           break;
 458
 459         case 'f':               /* Use ar_file for the archive */
 460           if (n_ar_files == ar_files_len)
 461             ar_files
 462               = (char **) ck_malloc (sizeof (char *)
 463                                      * (ar_files_len *= 2));
 464
 465           ar_files[n_ar_files++] = optarg;
 466           break;
 467
 468         case 'F':
 469           /* Since -F is only useful with -M , make it implied */
 470           f_run_script_at_end++;/* run this script at the end */
 471           info_script = optarg; /* of each tape */
 472           f_multivol++;
 473           break;
 474
 475         case 'G':               /* We are making a GNU dump; save
 476                                    directories at the beginning of
 477                                    the archive, and include in each
 478                                    directory its contents */
 479           if (f_oldarch)
 480             goto badopt;
 481           f_gnudump++;
 482           gnu_dumpfile = 0;
 483           break;
 484
 485         case 'h':
 486           f_follow_links++;     /* follow symbolic links */
 487           break;
 488
 489         case 'i':
 490           f_ignorez++;          /* Ignore zero records (eofs) */
 491           /*
 492                          * This can't be the default, because Unix tar
 493                          * writes two records of zeros, then pads out the
 494                          * block with garbage.
 495                          */
 496           break;
 497
 498         case 'k':               /* Don't overwrite files */
 499 #ifdef NO_OPEN3
 500           msg ("can't keep old files on this system");
 501           exit (EX_ARGSBAD);
 502 #else
 503           f_keep++;
 504 #endif
 505           break;
 506
 507         case 'K':
 508           f_startfile++;
 509           addname (optarg);
 510           break;
 511
 512         case 'l':               /* When dumping directories, don't
 513                                    dump files/subdirectories that are
 514                                    on other filesystems. */
 515           f_local_filesys++;
 516           break;
 517
 518         case 'L':
 519           tape_length = intconv (optarg);
 520           f_multivol++;
 521           break;
 522         case 'm':
 523           f_modified++;
 524           break;
 525
 526         case 'M':               /* Make Multivolume archive:
 527                                    When we can't write any more
 528                                    into the archive, re-open it,
 529                                    and continue writing */
 530           f_multivol++;
 531           break;
 532
 533         case 'N':               /* Only write files newer than X */
 534         get_newer:
 535           f_new_files++;
 536           new_time = get_date (optarg, (PTR) 0);
 537           if (new_time == (time_t) - 1)
 538             {
 539               msg ("invalid date format `%s'", optarg);
 540               exit (EX_ARGSBAD);
 541             }
 542           break;
 543
 544         case 'o':               /* Generate old archive */
 545           if (f_gnudump /* || f_dironly */ )
 546             goto badopt;
 547           f_oldarch++;
 548           break;
 549
 550         case 'O':
 551           f_exstdout++;
 552           break;
 553
 554         case 'p':
 555           f_use_protection++;
 556           break;
 557
 558         case 'P':
 559           f_absolute_paths++;
 560           break;
 561
 562         case 'r':               /* Append files to the archive */
 563           if (cmd_mode != CMD_NONE)
 564             goto badopt;
 565           cmd_mode = CMD_APPEND;
 566           break;
 567
 568         case 'R':
 569           f_sayblock++;         /* Print block #s for debug */
 570           break;                /* of bad tar archives */
 571
 572         case 's':
 573           f_sorted_names++;     /* Names to extr are sorted */
 574           break;
 575
 576         case 'S':               /* deal with sparse files */
 577           f_sparse_files++;
 578           break;
 579         case 't':
 580           if (cmd_mode != CMD_NONE)
 581             goto badopt;
 582           cmd_mode = CMD_LIST;
 583           f_verbose++;          /* "t" output == "cv" or "xv" */
 584           break;
 585
 586         case 'T':
 587           name_file = optarg;
 588           f_namefile++;
 589           break;
 590
 591         case 'u':               /* Append files to the archive that
 592                                    aren't there, or are newer than the
 593                                    copy in the archive */
 594           if (cmd_mode != CMD_NONE)
 595             goto badopt;
 596           cmd_mode = CMD_UPDATE;
 597           break;
 598
 599         case 'v':
 600           f_verbose++;
 601           break;
 602
 603         case 'V':
 604           f_volhdr = optarg;
 605           break;
 606
 607         case 'w':
 608           f_confirm++;
 609           break;
 610
 611         case 'W':
 612           f_verify++;
 613           break;
 614
 615         case 'x':               /* Extract files from the archive */
 616           if (cmd_mode != CMD_NONE)
 617             goto badopt;
 618           cmd_mode = CMD_EXTRACT;
 619           break;
 620
 621         case 'X':
 622           f_exclude++;
 623           add_exclude_file (optarg);
 624           break;
 625
 626         case 'z':               /* Easy to type */
 627         case 'Z':               /* Like the filename extension .Z */
 628           f_compress++;
 629           break;
 630
 631         case '?':
 632         badopt:
 633           msg ("Unknown option.  Use '%s --help' for a complete list of options.", tar);
 634           exit (EX_ARGSBAD);
 635
 636         }
 637     }
 638
 639   blocksize = blocking * RECORDSIZE;
 640   if (n_ar_files == 0)
 641     {
 642       n_ar_files = 1;
 643       ar_files[0] = getenv ("TAPE");    /* From environment, or */
 644       if (ar_files[0] == 0)
 645         ar_files[0] = DEF_AR_FILE;      /* From Makefile */
 646     }
 647   if (n_ar_files > 1 && !f_multivol)
 648     {
 649       msg ("Multiple archive files requires --multi-volume\n");
 650       exit (EX_ARGSBAD);
 651     }
 652 }
 653
 654
 655 /*
 656  * Print as much help as the user's gonna get.
 657  *
 658  * We have to sprinkle in the KLUDGE lines because too many compilers
 659  * cannot handle character strings longer than about 512 bytes.  Yuk!
 660  * In particular, MS-DOS and Xenix MSC and PDP-11 V7 Unix have this
 661  * problem.
 662  */
 663 void
 664 describe ()
 665 {
 666   puts ("choose one of the following:");
 667   fputs ("\
 668 -A, --catenate,\n\
 669     --concatenate       append tar files to an archive\n\
 670 -c, --create            create a new archive\n\
 671 -d, --diff,\n\
 672     --compare           find differences between archive and file system\n\
 673 --delete                delete from the archive (not for use on mag tapes!)\n\
 674 -r, --append            append files to the end of an archive\n\
 675 -t, --list              list the contents of an archive\n\
 676 -u, --update            only append files that are newer than copy in archive\n\
 677 -x, --extract,\n\
 678     --get               extract files from an archive\n", stdout);
 679
 680   fprintf (stdout, "\
 681 Other options:\n\
 682 --atime-preserve        don't change access times on dumped files\n\
 683 -b, --block-size N      block size of Nx512 bytes (default N=%d)\n", DEFBLOCKING);
 684   fputs ("\
 685 -B, --read-full-blocks  reblock as we read (for reading 4.2BSD pipes)\n\
 686 -C, --directory DIR     change to directory DIR\n\
 687 --checkpoint            print directory names while reading the archive\n\
 688 ", stdout);                     /* KLUDGE */
 689   fprintf (stdout, "\
 690 -f, --file [HOSTNAME:]F use archive file or device F (default %s)\n",
 691            DEF_AR_FILE);
 692   fputs ("\
 693 --force-local           archive file is local even if has a colon\n\
 694 -F, --info-script F     run script at end of each tape (implies -M)\n\
 695 -G, --incremental       create/list/extract old GNU-format incremental backup\n\
 696 -g, --listed-incremental F create/list/extract new GNU-format incremental backup\n\
 697 -h, --dereference       don't dump symlinks; dump the files they point to\n\
 698 -i, --ignore-zeros      ignore blocks of zeros in archive (normally mean EOF)\n\
 699 --ignore-failed-read    don't exit with non-zero status on unreadable files\n\
 700 -k, --keep-old-files    keep existing files; don't overwrite them from archive\n\
 701 -K, --starting-file F   begin at file F in the archive\n\
 702 -l, --one-file-system   stay in local file system when creating an archive\n\
 703 -L, --tape-length LENGTH change tapes after writing LENGTH\n\
 704 ", stdout);                     /* KLUDGE */
 705   fputs ("\
 706 -m, --modification-time don't extract file modified time\n\
 707 -M, --multi-volume      create/list/extract multi-volume archive\n\
 708 -N, --after-date DATE,\n\
 709     --newer DATE        only store files newer than DATE\n\
 710 -o, --old-archive,\n\
 711     --portability       write a V7 format archive, rather than ANSI format\n\
 712 -O, --to-stdout         extract files to standard output\n\
 713 -p, --same-permissions,\n\
 714     --preserve-permissions extract all protection information\n\
 715 -P, --absolute-paths    don't strip leading `/'s from file names\n\
 716 --preserve              like -p -s\n\
 717 ", stdout);                     /* KLUDGE */
 718   fputs ("\
 719 -R, --record-number     show record number within archive with each message\n\
 720 --remove-files          remove files after adding them to the archive\n\
 721 -s, --same-order,\n\
 722     --preserve-order    list of names to extract is sorted to match archive\n\
 723 --same-owner            create extracted files with the same ownership \n\
 724 -S, --sparse            handle sparse files efficiently\n\
 725 -T, --files-from F      get names to extract or create from file F\n\
 726 --null                  -T reads null-terminated names, disable -C\n\
 727 --totals                print total bytes written with --create\n\
 728 -v, --verbose           verbosely list files processed\n\
 729 -V, --label NAME        create archive with volume name NAME\n\
 730 --version               print tar program version number\n\
 731 -w, --interactive,\n\
 732     --confirmation      ask for confirmation for every action\n\
 733 ", stdout);                     /* KLUDGE */
 734   fputs ("\
 735 -W, --verify            attempt to verify the archive after writing it\n\
 736 --exclude FILE          exclude file FILE\n\
 737 -X, --exclude-from FILE exclude files listed in FILE\n\
 738 -z, -Z, --compress,\n\
 739     --uncompress        filter the archive through compress\n\
 740 -[0-7][lmh]             specify drive and density\n\
 741 ", stdout);
 742 }
 743
 744 void
 745 name_add (name)
 746      char *name;
 747 {
 748   if (n_indalloc == n_indused)
 749     {
 750       n_indalloc += 10;
 751       n_ind = (char **) (n_indused ? ck_realloc (n_ind, n_indalloc * sizeof (char *)): ck_malloc (n_indalloc * sizeof (char *)));
 752     }
 753   n_ind[n_indused++] = name;
 754 }
 755
 756 /*
 757  * Set up to gather file names for tar.
 758  *
 759  * They can either come from stdin or from argv.
 760  */
 761 void
 762 name_init (argc, argv)
 763      int argc;
 764      char **argv;
 765 {
 766
 767   if (f_namefile)
 768     {
 769       if (optind < argc)
 770         {
 771           msg ("too many args with -T option");
 772           exit (EX_ARGSBAD);
 773         }
 774       if (!strcmp (name_file, "-"))
 775         {
 776           namef = stdin;
 777         }
 778       else
 779         {
 780           namef = fopen (name_file, "r");
 781           if (namef == NULL)
 782             {
 783               msg_perror ("can't open file %s", name_file);
 784               exit (EX_BADFILE);
 785             }
 786         }
 787     }
 788   else
 789     {
 790       /* Get file names from argv, after options. */
 791       n_argc = argc;
 792       n_argv = argv;
 793     }
 794 }
 795
 796 /* Read the next filename read from STREAM and null-terminate it.
 797    Put it into BUFFER, reallocating and adjusting *PBUFFER_SIZE if necessary.
 798    Return the new value for BUFFER, or NULL at end of file. */
 799
 800 char *
 801 read_name_from_file (buffer, pbuffer_size, stream)
 802      char *buffer;
 803      size_t *pbuffer_size;
 804      FILE *stream;
 805 {
 806   register int c;
 807   register int indx = 0;
 808   register size_t buffer_size = *pbuffer_size;
 809
 810   while ((c = getc (stream)) != EOF && c != filename_terminator)
 811     {
 812       if (indx == buffer_size)
 813         {
 814           buffer_size += NAMSIZ;
 815           buffer = ck_realloc (buffer, buffer_size + 2);
 816         }
 817       buffer[indx++] = c;
 818     }
 819   if (indx == 0 && c == EOF)
 820     return NULL;
 821   if (indx == buffer_size)
 822     {
 823       buffer_size += NAMSIZ;
 824       buffer = ck_realloc (buffer, buffer_size + 2);
 825     }
 826   buffer[indx] = '\0';
 827   *pbuffer_size = buffer_size;
 828   return buffer;
 829 }
 830
 831 /*
 832  * Get the next name from argv or the name file.
 833  *
 834  * Result is in static storage and can't be relied upon across two calls.
 835  *
 836  * If CHANGE_DIRS is non-zero, treat a filename of the form "-C" as
 837  * meaning that the next filename is the name of a directory to change to.
 838  * If `filename_terminator' is '\0', CHANGE_DIRS is effectively always 0.
 839  */
 840
 841 char *
 842 name_next (change_dirs)
 843      int change_dirs;
 844 {
 845   static char *buffer;          /* Holding pattern */
 846   static int buffer_siz;
 847   register char *p;
 848   register char *q = 0;
 849   register int next_name_is_dir = 0;
 850   extern char *un_quote_string ();
 851
 852   if (buffer_siz == 0)
 853     {
 854       buffer = ck_malloc (NAMSIZ + 2);
 855       buffer_siz = NAMSIZ;
 856     }
 857   if (filename_terminator == '\0')
 858     change_dirs = 0;
 859 tryagain:
 860   if (namef == NULL)
 861     {
 862       if (n_indscan < n_indused)
 863         p = n_ind[n_indscan++];
 864       else if (optind < n_argc)
 865         /* Names come from argv, after options */
 866         p = n_argv[optind++];
 867       else
 868         {
 869           if (q)
 870             msg ("Missing filename after -C");
 871           return NULL;
 872         }
 873
 874       /* JF trivial support for -C option.  I don't know if
 875                    chdir'ing at this point is dangerous or not.
 876                    It seems to work, which is all I ask. */
 877       if (change_dirs && !q && p[0] == '-' && p[1] == 'C' && p[2] == '\0')
 878         {
 879           q = p;
 880           goto tryagain;
 881         }
 882       if (q)
 883         {
 884           if (chdir (p) < 0)
 885             msg_perror ("Can't chdir to %s", p);
 886           q = 0;
 887           goto tryagain;
 888         }
 889       /* End of JF quick -C hack */
 890
 891       if (f_exclude && check_exclude (p))
 892         goto tryagain;
 893       return un_quote_string (p);
 894     }
 895   while (p = read_name_from_file (buffer, &buffer_siz, namef))
 896     {
 897       buffer = p;
 898       if (*p == '\0')
 899         continue;               /* Ignore empty lines. */
 900       q = p + strlen (p) - 1;
 901       while (q > p && *q == '/')/* Zap trailing "/"s. */
 902         *q-- = '\0';
 903       if (change_dirs && next_name_is_dir == 0
 904           && p[0] == '-' && p[1] == 'C' && p[2] == '\0')
 905         {
 906           next_name_is_dir = 1;
 907           goto tryagain;
 908         }
 909       if (next_name_is_dir)
 910         {
 911           if (chdir (p) < 0)
 912             msg_perror ("Can't change to directory %s", p);
 913           next_name_is_dir = 0;
 914           goto tryagain;
 915         }
 916       if (f_exclude && check_exclude (p))
 917         goto tryagain;
 918       return un_quote_string (p);
 919     }
 920   return NULL;
 921 }
 922
 923
 924 /*
 925  * Close the name file, if any.
 926  */
 927 void
 928 name_close ()
 929 {
 930
 931   if (namef != NULL && namef != stdin)
 932     fclose (namef);
 933 }
 934
 935
 936 /*
 937  * Gather names in a list for scanning.
 938  * Could hash them later if we really care.
 939  *
 940  * If the names are already sorted to match the archive, we just
 941  * read them one by one.  name_gather reads the first one, and it
 942  * is called by name_match as appropriate to read the next ones.
 943  * At EOF, the last name read is just left in the buffer.
 944  * This option lets users of small machines extract an arbitrary
 945  * number of files by doing "tar t" and editing down the list of files.
 946  */
 947 void
 948 name_gather ()
 949 {
 950   register char *p;
 951   static struct name *namebuf;  /* One-name buffer */
 952   static namelen;
 953   static char *chdir_name;
 954
 955   if (f_sorted_names)
 956     {
 957       if (!namelen)
 958         {
 959           namelen = NAMSIZ;
 960           namebuf = (struct name *) ck_malloc (sizeof (struct name) + NAMSIZ);
 961         }
 962       p = name_next (0);
 963       if (p)
 964         {
 965           if (*p == '-' && p[1] == 'C' && p[2] == '\0')
 966             {
 967               chdir_name = name_next (0);
 968               p = name_next (0);
 969               if (!p)
 970                 {
 971                   msg ("Missing file name after -C");
 972                   exit (EX_ARGSBAD);
 973                 }
 974               namebuf->change_dir = chdir_name;
 975             }
 976           namebuf->length = strlen (p);
 977           if (namebuf->length >= namelen)
 978             {
 979               namebuf = (struct name *) ck_realloc (namebuf, sizeof (struct name) + namebuf->length);
 980               namelen = namebuf->length;
 981             }
 982           strncpy (namebuf->name, p, namebuf->length);
 983           namebuf->name[namebuf->length] = 0;
 984           namebuf->next = (struct name *) NULL;
 985           namebuf->found = 0;
 986           namelist = namebuf;
 987           namelast = namelist;
 988         }
 989       return;
 990     }
 991
 992   /* Non sorted names -- read them all in */
 993   while (p = name_next (0))
 994     addname (p);
 995 }
 996
 997 /*
 998  * Add a name to the namelist.
 999  */
1000 void
1001 addname (name)
1002      char *name;                /* pointer to name */
1003 {
1004   register int i;               /* Length of string */
1005   register struct name *p;      /* Current struct pointer */
1006   static char *chdir_name;
1007   char *new_name ();
1008
1009   if (name[0] == '-' && name[1] == 'C' && name[2] == '\0')
1010     {
1011       chdir_name = name_next (0);
1012       name = name_next (0);
1013       if (!chdir_name)
1014         {
1015           msg ("Missing file name after -C");
1016           exit (EX_ARGSBAD);
1017         }
1018       if (chdir_name[0] != '/')
1019         {
1020           char *path = ck_malloc (PATH_MAX);
1021 #if defined(__MSDOS__) || defined(USG) || defined(_POSIX_VERSION)
1022           if (!getcwd (path, PATH_MAX))
1023             {
1024               msg ("Couldn't get current directory.");
1025               exit (EX_SYSTEM);
1026             }
1027 #else
1028           char *getwd ();
1029
1030           if (!getwd (path))
1031             {
1032               msg ("Couldn't get current directory: %s", path);
1033               exit (EX_SYSTEM);
1034             }
1035 #endif
1036           chdir_name = new_name (path, chdir_name);
1037           free (path);
1038         }
1039     }
1040
1041   if (name)
1042     {
1043       i = strlen (name);
1044       /*NOSTRICT*/
1045       p = (struct name *) malloc ((unsigned) (sizeof (struct name) + i));
1046     }
1047   else
1048     p = (struct name *) malloc ((unsigned) (sizeof (struct name)));
1049   if (!p)
1050     {
1051       if (name)
1052         msg ("cannot allocate mem for name '%s'.", name);
1053       else
1054         msg ("cannot allocate mem for chdir record.");
1055       exit (EX_SYSTEM);
1056     }
1057   p->next = (struct name *) NULL;
1058   if (name)
1059     {
1060       p->fake = 0;
1061       p->length = i;
1062       strncpy (p->name, name, i);
1063       p->name[i] = '\0';        /* Null term */
1064     }
1065   else
1066     p->fake = 1;
1067   p->found = 0;
1068   p->regexp = 0;                /* Assume not a regular expression */
1069   p->firstch = 1;               /* Assume first char is literal */
1070   p->change_dir = chdir_name;
1071   p->dir_contents = 0;          /* JF */
1072   if (name)
1073     {
1074       if (index (name, '*') || index (name, '[') || index (name, '?'))
1075         {
1076           p->regexp = 1;        /* No, it's a regexp */
1077           if (name[0] == '*' || name[0] == '[' || name[0] == '?')
1078             p->firstch = 0;     /* Not even 1st char literal */
1079         }
1080     }
1081
1082   if (namelast)
1083     namelast->next = p;
1084   namelast = p;
1085   if (!namelist)
1086     namelist = p;
1087 }
1088
1089 /*
1090  * Return nonzero if name P (from an archive) matches any name from
1091  * the namelist, zero if not.
1092  */
1093 int
1094 name_match (p)
1095      register char *p;
1096 {
1097   register struct name *nlp;
1098   register int len;
1099
1100 again:
1101   if (0 == (nlp = namelist))    /* Empty namelist is easy */
1102     return 1;
1103   if (nlp->fake)
1104     {
1105       if (nlp->change_dir && chdir (nlp->change_dir))
1106         msg_perror ("Can't change to directory %d", nlp->change_dir);
1107       namelist = 0;
1108       return 1;
1109     }
1110   len = strlen (p);
1111   for (; nlp != 0; nlp = nlp->next)
1112     {
1113       /* If first chars don't match, quick skip */
1114       if (nlp->firstch && nlp->name[0] != p[0])
1115         continue;
1116
1117       /* Regular expressions (shell globbing, actually). */
1118       if (nlp->regexp)
1119         {
1120           if (fnmatch (nlp->name, p, FNM_LEADING_DIR) == 0)
1121             {
1122               nlp->found = 1;   /* Remember it matched */
1123               if (f_startfile)
1124                 {
1125                   free ((void *) namelist);
1126                   namelist = 0;
1127                 }
1128               if (nlp->change_dir && chdir (nlp->change_dir))
1129                 msg_perror ("Can't change to directory %s", nlp->change_dir);
1130               return 1;         /* We got a match */
1131             }
1132           continue;
1133         }
1134
1135       /* Plain Old Strings */
1136       if (nlp->length <= len    /* Archive len >= specified */
1137           && (p[nlp->length] == '\0' || p[nlp->length] == '/')
1138       /* Full match on file/dirname */
1139           && strncmp (p, nlp->name, nlp->length) == 0)  /* Name compare */
1140         {
1141           nlp->found = 1;       /* Remember it matched */
1142           if (f_startfile)
1143             {
1144               free ((void *) namelist);
1145               namelist = 0;
1146             }
1147           if (nlp->change_dir && chdir (nlp->change_dir))
1148             msg_perror ("Can't change to directory %s", nlp->change_dir);
1149           return 1;             /* We got a match */
1150         }
1151     }
1152
1153   /*
1154          * Filename from archive not found in namelist.
1155          * If we have the whole namelist here, just return 0.
1156          * Otherwise, read the next name in and compare it.
1157          * If this was the last name, namelist->found will remain on.
1158          * If not, we loop to compare the newly read name.
1159          */
1160   if (f_sorted_names && namelist->found)
1161     {
1162       name_gather ();           /* Read one more */
1163       if (!namelist->found)
1164         goto again;
1165     }
1166   return 0;
1167 }
1168
1169
1170 /*
1171  * Print the names of things in the namelist that were not matched.
1172  */
1173 void
1174 names_notfound ()
1175 {
1176   register struct name *nlp, *next;
1177   register char *p;
1178
1179   for (nlp = namelist; nlp != 0; nlp = next)
1180     {
1181       next = nlp->next;
1182       if (!nlp->found)
1183         msg ("%s not found in archive", nlp->name);
1184
1185       /*
1186                  * We could free() the list, but the process is about
1187                  * to die anyway, so save some CPU time.  Amigas and
1188                  * other similarly broken software will need to waste
1189                  * the time, though.
1190                  */
1191 #ifdef amiga
1192       if (!f_sorted_names)
1193         free (nlp);
1194 #endif
1195     }
1196   namelist = (struct name *) NULL;
1197   namelast = (struct name *) NULL;
1198
1199   if (f_sorted_names)
1200     {
1201       while (0 != (p = name_next (1)))
1202         msg ("%s not found in archive", p);
1203     }
1204 }
1205
1206 /* These next routines were created by JF */
1207
1208 void
1209 name_expand ()
1210 {
1211   ;
1212 }
1213
1214 /* This is like name_match(), except that it returns a pointer to the name
1215    it matched, and doesn't set ->found  The caller will have to do that
1216    if it wants to.  Oh, and if the namelist is empty, it returns 0, unlike
1217    name_match(), which returns TRUE */
1218
1219 struct name *
1220 name_scan (p)
1221      register char *p;
1222 {
1223   register struct name *nlp;
1224   register int len;
1225
1226 again:
1227   if (0 == (nlp = namelist))    /* Empty namelist is easy */
1228     return 0;
1229   len = strlen (p);
1230   for (; nlp != 0; nlp = nlp->next)
1231     {
1232       /* If first chars don't match, quick skip */
1233       if (nlp->firstch && nlp->name[0] != p[0])
1234         continue;
1235
1236       /* Regular expressions */
1237       if (nlp->regexp)
1238         {
1239           if (fnmatch (nlp->name, p, FNM_LEADING_DIR) == 0)
1240             return nlp;         /* We got a match */
1241           continue;
1242         }
1243
1244       /* Plain Old Strings */
1245       if (nlp->length <= len    /* Archive len >= specified */
1246           && (p[nlp->length] == '\0' || p[nlp->length] == '/')
1247       /* Full match on file/dirname */
1248           && strncmp (p, nlp->name, nlp->length) == 0)  /* Name compare */
1249         return nlp;             /* We got a match */
1250     }
1251
1252   /*
1253          * Filename from archive not found in namelist.
1254          * If we have the whole namelist here, just return 0.
1255          * Otherwise, read the next name in and compare it.
1256          * If this was the last name, namelist->found will remain on.
1257          * If not, we loop to compare the newly read name.
1258          */
1259   if (f_sorted_names && namelist->found)
1260     {
1261       name_gather ();           /* Read one more */
1262       if (!namelist->found)
1263         goto again;
1264     }
1265   return (struct name *) 0;
1266 }
1267
1268 /* This returns a name from the namelist which doesn't have ->found set.
1269    It sets ->found before returning, so successive calls will find and return
1270    all the non-found names in the namelist */
1271
1272 struct name *gnu_list_name;
1273
1274 char *
1275 name_from_list ()
1276 {
1277   if (!gnu_list_name)
1278     gnu_list_name = namelist;
1279   while (gnu_list_name && gnu_list_name->found)
1280     gnu_list_name = gnu_list_name->next;
1281   if (gnu_list_name)
1282     {
1283       gnu_list_name->found++;
1284       if (gnu_list_name->change_dir)
1285         if (chdir (gnu_list_name->change_dir) < 0)
1286           msg_perror ("can't chdir to %s", gnu_list_name->change_dir);
1287       return gnu_list_name->name;
1288     }
1289   return (char *) 0;
1290 }
1291
1292 void
1293 blank_name_list ()
1294 {
1295   struct name *n;
1296
1297   gnu_list_name = 0;
1298   for (n = namelist; n; n = n->next)
1299     n->found = 0;
1300 }
1301
1302 char *
1303 new_name (path, name)
1304      char *path, *name;
1305 {
1306   char *path_buf;
1307
1308   path_buf = (char *) malloc (strlen (path) + strlen (name) + 2);
1309   if (path_buf == 0)
1310     {
1311       msg ("Can't allocate memory for name '%s/%s", path, name);
1312       exit (EX_SYSTEM);
1313     }
1314   (void) sprintf (path_buf, "%s/%s", path, name);
1315   return path_buf;
1316 }
1317
1318 /* returns non-zero if the luser typed 'y' or 'Y', zero otherwise. */
1319
1320 int
1321 confirm (action, file)
1322      char *action, *file;
1323 {
1324   int c, nl;
1325   static FILE *confirm_file = 0;
1326   extern FILE *msg_file;
1327   extern char TTY_NAME[];
1328
1329   fprintf (msg_file, "%s %s?", action, file);
1330   fflush (msg_file);
1331   if (!confirm_file)
1332     {
1333       confirm_file = (archive == 0) ? fopen (TTY_NAME, "r") : stdin;
1334       if (!confirm_file)
1335         {
1336           msg ("Can't read confirmation from user");
1337           exit (EX_SYSTEM);
1338         }
1339     }
1340   c = getc (confirm_file);
1341   for (nl = c; nl != '\n' && nl != EOF; nl = getc (confirm_file))
1342     ;
1343   return (c == 'y' || c == 'Y');
1344 }
1345
1346 char *x_buffer = 0;
1347 int size_x_buffer;
1348 int free_x_buffer;
1349
1350 char **exclude = 0;
1351 int size_exclude = 0;
1352 int free_exclude = 0;
1353
1354 char **re_exclude = 0;
1355 int size_re_exclude = 0;
1356 int free_re_exclude = 0;
1357
1358 void
1359 add_exclude (name)
1360      char *name;
1361 {
1362   /*    char *rname;*/
1363   /*    char **tmp_ptr;*/
1364   int size_buf;
1365
1366   un_quote_string (name);
1367   size_buf = strlen (name);
1368
1369   if (x_buffer == 0)
1370     {
1371       x_buffer = (char *) ck_malloc (size_buf + 1024);
1372       free_x_buffer = 1024;
1373     }
1374   else if (free_x_buffer <= size_buf)
1375     {
1376       char *old_x_buffer;
1377       char **tmp_ptr;
1378
1379       old_x_buffer = x_buffer;
1380       x_buffer = (char *) ck_realloc (x_buffer, size_x_buffer + 1024);
1381       free_x_buffer = 1024;
1382       for (tmp_ptr = exclude; tmp_ptr < exclude + size_exclude; tmp_ptr++)
1383         *tmp_ptr = x_buffer + ((*tmp_ptr) - old_x_buffer);
1384       for (tmp_ptr = re_exclude; tmp_ptr < re_exclude + size_re_exclude; tmp_ptr++)
1385         *tmp_ptr = x_buffer + ((*tmp_ptr) - old_x_buffer);
1386     }
1387
1388   if (is_regex (name))
1389     {
1390       if (free_re_exclude == 0)
1391         {
1392           re_exclude = (char **) (re_exclude ? ck_realloc (re_exclude, (size_re_exclude + 32) * sizeof (char *)): ck_malloc (sizeof (char *) * 32));
1393           free_re_exclude += 32;
1394         }
1395       re_exclude[size_re_exclude] = x_buffer + size_x_buffer;
1396       size_re_exclude++;
1397       free_re_exclude--;
1398     }
1399   else
1400     {
1401       if (free_exclude == 0)
1402         {
1403           exclude = (char **) (exclude ? ck_realloc (exclude, (size_exclude + 32) * sizeof (char *)): ck_malloc (sizeof (char *) * 32));
1404           free_exclude += 32;
1405         }
1406       exclude[size_exclude] = x_buffer + size_x_buffer;
1407       size_exclude++;
1408       free_exclude--;
1409     }
1410   strcpy (x_buffer + size_x_buffer, name);
1411   size_x_buffer += size_buf + 1;
1412   free_x_buffer -= size_buf + 1;
1413 }
1414
1415 void
1416 add_exclude_file (file)
1417      char *file;
1418 {
1419   FILE *fp;
1420   char buf[1024];
1421
1422   if (strcmp (file, "-"))
1423     fp = fopen (file, "r");
1424   else
1425     /* Let's hope the person knows what they're doing. */
1426     /* Using -X - -T - -f - will get you *REALLY* strange
1427                    results. . . */
1428     fp = stdin;
1429
1430   if (!fp)
1431     {
1432       msg_perror ("can't open %s", file);
1433       exit (2);
1434     }
1435   while (fgets (buf, 1024, fp))
1436     {
1437       /*                int size_buf;*/
1438       char *end_str;
1439
1440       end_str = rindex (buf, '\n');
1441       if (end_str)
1442         *end_str = '\0';
1443       add_exclude (buf);
1444
1445     }
1446   fclose (fp);
1447 }
1448
1449 int
1450 is_regex (str)
1451      char *str;
1452 {
1453   return index (str, '*') || index (str, '[') || index (str, '?');
1454 }
1455
1456 /* Returns non-zero if the file 'name' should not be added/extracted */
1457 int
1458 check_exclude (name)
1459      char *name;
1460 {
1461   int n;
1462   char *str;
1463   extern char *strstr ();
1464
1465   for (n = 0; n < size_re_exclude; n++)
1466     {
1467       if (fnmatch (re_exclude[n], name, FNM_LEADING_DIR) == 0)
1468         return 1;
1469     }
1470   for (n = 0; n < size_exclude; n++)
1471     {
1472       /* Accept the output from strstr only if it is the last
1473                    part of the string.  There is certainly a faster way to
1474                    do this. . . */
1475       if ((str = strstr (name, exclude[n]))
1476           && (str == name || str[-1] == '/')
1477           && str[strlen (exclude[n])] == '\0')
1478         return 1;
1479     }
1480   return 0;
1481 }