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[chaz/tar] / src / tar.c

/* Tar -- a tape archiver.
   Copyright (C) 1988, 1992 Free Software Foundation

This file is part of GNU Tar.

GNU Tar is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.

GNU Tar is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with GNU Tar; see the file COPYING.  If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */

/*
 * A tar (tape archiver) program.
 *
 * Written by John Gilmore, ihnp4!hoptoad!gnu, starting 25 Aug 85.
 */

#include <stdio.h>
#include <sys/types.h>          /* Needed for typedefs in tar.h */
#include "getopt.h"
#include "regex.h"

/*
 * The following causes "tar.h" to produce definitions of all the
 * global variables, rather than just "extern" declarations of them.
 */
#define TAR_EXTERN /**/
#include "tar.h"

#include "port.h"

#if defined(_POSIX_VERSION) || defined(DIRENT)
#include <dirent.h>
#ifdef direct
#undef direct
#endif /* direct */
#define direct dirent
#define DP_NAMELEN(x) strlen((x)->d_name)
#endif /* _POSIX_VERSION or DIRENT */
#if !defined(_POSIX_VERSION) && !defined(DIRENT) && defined(BSD42)
#include <sys/dir.h>
#define DP_NAMELEN(x)   (x)->d_namlen
#endif /* not _POSIX_VERSION and BSD42 */
#ifdef __MSDOS__
#include "msd_dir.h"
#define DP_NAMELEN(x)   (x)->d_namlen
#define direct dirent
#endif
#if defined(USG) && !defined(_POSIX_VERSION) && !defined(DIRENT)
#include <ndir.h>
#define DP_NAMELEN(x) strlen((x)->d_name)
#endif /* USG and not _POSIX_VERSION and not DIRENT */

/*
 * We should use a conversion routine that does reasonable error
 * checking -- atoi doesn't.  For now, punt.  FIXME.
 */
#define intconv atoi
PTR ck_malloc();
PTR ck_realloc();
extern int      getoldopt();
extern void     read_and();
extern void     list_archive();
extern void     extract_archive();
extern void     diff_archive();
extern void     create_archive();
extern void     update_archive();
extern void     junk_archive();

/* JF */
extern time_t   get_date();

time_t new_time;

static FILE     *namef;         /* File to read names from */
static char     **n_argv;       /* Argv used by name routines */
static int      n_argc;         /* Argc used by name routines */
static char     **n_ind;        /* Store an array of names */
static int      n_indalloc;     /* How big is the array? */
static int      n_indused;      /* How many entries does it have? */
static int      n_indscan;      /* How many of the entries have we scanned? */


extern FILE *msg_file;

int     check_exclude();
void    add_exclude();
void    add_exclude_file();
void    addname();
void    describe();
void    diff_init();
void    extr_init();
int     is_regex();
void    name_add();
void    name_init();
void    options();
char    *un_quote_string();
int     wildmat();

#ifndef S_ISLNK
#define lstat stat
#endif

#ifndef DEFBLOCKING
#define DEFBLOCKING 20
#endif

#ifndef DEF_AR_FILE
#define DEF_AR_FILE "tar.out"
#endif

/* For long options that unconditionally set a single flag, we have getopt
   do it.  For the others, we share the code for the equivalent short
   named option, the name of which is stored in the otherwise-unused `val'
   field of the `struct option'; for long options that have no equivalent
   short option, we use nongraphic characters as pseudo short option
   characters, starting (for no particular reason) with character 10. */

struct option long_options[] =
{
        {"create",              0,      0,                      'c'},
        {"append",              0,      0,                      'r'},
        {"extract",             0,      0,                      'x'},
        {"get",                 0,      0,                      'x'},
        {"list",                0,      0,                      't'},
        {"update",              0,      0,                      'u'},
        {"catenate",            0,      0,                      'A'},
        {"concatenate",         0,      0,                      'A'},
        {"compare",             0,      0,                      'd'},
        {"diff",                0,      0,                      'd'},
        {"delete",              0,      0,                      14},
        {"help",                0,      0,                      12},

        {"null",                0,      0,                      16},
        {"directory",           1,      0,                      'C'},
        {"record-number",       0,      &f_sayblock,            1},
        {"files-from",          1,      0,                      'T'},
        {"label",               1,      0,                      'V'},
        {"exclude-from",        1,      0,                      'X'},
        {"exclude",             1,      0,                      15},
        {"file",                1,      0,                      'f'},
        {"block-size",          1,      0,                      'b'},
        {"version",             0,      0,                      11},
        {"verbose",             0,      0,                      'v'},
        {"totals",              0,      &f_totals,              1},
          
        {"read-full-blocks",    0,      &f_reblock,             1},
        {"starting-file",       1,      0,                      'K'},
        {"to-stdout",           0,      &f_exstdout,            1},
        {"ignore-zeros",        0,      &f_ignorez,             1},
        {"keep-old-files",      0,      0,                      'k'},
        {"uncompress",          0,      &f_compress,            1},
        {"same-permissions",    0,      &f_use_protection,      1},
        {"preserve-permissions",0,      &f_use_protection,      1},
        {"modification-time",   0,      &f_modified,            1},
        {"preserve",            0,      0,                      10},
        {"same-order",          0,      &f_sorted_names,        1},
        {"same-owner",          0,      &f_do_chown,            1},
        {"preserve-order",      0,      &f_sorted_names,        1},

        {"newer",               1,      0,                      'N'},
        {"after-date",          1,      0,                      'N'},
        {"newer-mtime",         1,      0,                      13},
        {"incremental",         0,      0,                      'G'},
        {"listed-incremental",  1,      0,                      'g'},
        {"multi-volume",        0,      &f_multivol,            1},
        {"info-script",         1,      0,                      'F'},
        {"absolute-paths",      0,      &f_absolute_paths,      1},
        {"interactive",         0,      &f_confirm,             1},
        {"confirmation",        0,      &f_confirm,             1},

        {"verify",              0,      &f_verify,              1},
        {"dereference",         0,      &f_follow_links,        1},
        {"one-file-system",     0,      &f_local_filesys,       1},
        {"old-archive",         0,      0,                      'o'},
        {"portability",         0,      0,                      'o'},
        {"compress",            0,      &f_compress,            1},
        {"compress-block",      0,      &f_compress,            2},
        {"sparse",              0,      &f_sparse_files,        1},
        {"tape-length",         1,      0,                      'L'},
        {"remove-files",        0,      &f_remove_files,        1},
        {"ignore-failed-read",  0,      &f_ignore_failed_read,  1},
        {"checkpoint",          0,      &f_checkpoint,          1},
        {"show-omitted-dirs",   0,      &f_show_omitted_dirs,   1},
        {"volno-file",          1,      0,                      17},
        {"force-local",         0,      &f_force_local,         1},
        {"atime-preserve",      0,      &f_atime_preserve,      1},

        {0, 0, 0, 0}
};

/*
 * Main routine for tar.
 */
void
main(argc, argv)
        int     argc;
        char    **argv;
{
        extern char version_string[];

        tar = argv[0];          /* JF: was "tar" Set program name */
        filename_terminator = '\n';
        errors = 0;

        options(argc, argv);

        if(!n_argv)
                name_init(argc, argv);

        if (f_volno_file)
          init_volume_number ();
        
        switch(cmd_mode) {
        case CMD_CAT:
        case CMD_UPDATE:
        case CMD_APPEND:
                update_archive();
                break;
        case CMD_DELETE:
                junk_archive();
                break;
        case CMD_CREATE:
                create_archive();
                if (f_totals)
                        fprintf (stderr, "Total bytes written: %d\n", tot_written);
                break;
        case CMD_EXTRACT:
                if (f_volhdr) {
                        const char *err;
                        label_pattern = (struct re_pattern_buffer *)
                          ck_malloc (sizeof *label_pattern);
                        err = re_compile_pattern (f_volhdr, strlen (f_volhdr),
                                                  label_pattern);
                        if (err) {
                                fprintf (stderr,"Bad regular expression: %s\n",
                                         err);
                                errors++;
                                break;
                        }
                   
                }                 
                extr_init();
                read_and(extract_archive);
                break;
        case CMD_LIST:
                if (f_volhdr) {
                        const char *err;
                        label_pattern = (struct re_pattern_buffer *)
                          ck_malloc (sizeof *label_pattern);
                        err = re_compile_pattern (f_volhdr, strlen (f_volhdr),
                                                  label_pattern);
                        if (err) {
                                fprintf (stderr,"Bad regular expression: %s\n",
                                         err);
                                errors++;
                                break;
                        }
                }                 
                read_and(list_archive);
#if 0
                if (!errors)
                        errors = different;
#endif
                break;
        case CMD_DIFF:
                diff_init();
                read_and(diff_archive);
                break;
        case CMD_VERSION:
                fprintf(stderr,"%s\n",version_string);
                break;
        case CMD_NONE:
                msg("you must specify exactly one of the r, c, t, x, or d options\n");
                fprintf(stderr,"For more information, type ``%s +help''.\n",tar);
                exit(EX_ARGSBAD);
        }
        if (f_volno_file)
          closeout_volume_number ();
        exit(errors);
        /* NOTREACHED */
}


/*
 * Parse the options for tar.
 */
void
options(argc, argv)
        int     argc;
        char    **argv;
{
        register int    c;              /* Option letter */
        int             ind = -1;

        /* Set default option values */
        blocking = DEFBLOCKING;         /* From Makefile */
        ar_files = (char **) malloc (sizeof (char *) * 10);
        ar_files_len = 10;
        n_ar_files = 0;
        cur_ar_file = 0;

        /* Parse options */
        while ((c = getoldopt(argc, argv,
                              "-01234567Ab:BcC:df:F:g:GhikK:lL:mMN:oOpPrRsStT:uvV:wWxX:zZ",
                              long_options, &ind)) != EOF) {
                switch (c) {
                case 0:         /* long options that set a single flag */
                        break;
                case 1:
                        /* File name or non-parsed option */
                        name_add(optarg);
                        break;
                case 'C':
                        name_add("-C");
                        name_add(optarg);
                        break;
                case 10:        /* preserve */
                        f_use_protection = f_sorted_names = 1;
                        break;
                case 11:
                        if(cmd_mode!=CMD_NONE)
                                goto badopt;
                        cmd_mode=CMD_VERSION;
                        break;
                case 12:        /* help */
                        printf("This is GNU tar, the tape archiving program.\n");
                        describe();
                        exit(1);
                case 13:
                        f_new_files++;
                        goto get_newer;

                case 14:        /* Delete in the archive */
                        if(cmd_mode!=CMD_NONE)
                                goto badopt;
                        cmd_mode=CMD_DELETE;
                        break;

                case 15:
                        f_exclude++;
                        add_exclude(optarg);
                        break;

                case 16:        /* -T reads null terminated filenames. */
                        filename_terminator = '\0';
                        break;

                case 17:
                        f_volno_file = optarg;
                        break;
                        
                case 'g':       /* We are making a GNU dump; save
                                   directories at the beginning of
                                   the archive, and include in each
                                   directory its contents */
                        if(f_oldarch)
                                goto badopt;
                        f_gnudump++;
                        gnu_dumpfile=optarg;
                        break;


                case '0':
                case '1':
                case '2':
                case '3':
                case '4':
                case '5':
                case '6':
                case '7':
                        {
                                /* JF this'll have to be modified for other
                                   systems, of course! */
                                int d,add;
                                static char buf[50];

                                d=getoldopt(argc,argv,"lmh");
#ifdef MAYBEDEF
                                sprintf(buf,"/dev/rmt/%d%c",c,d);
#else
#ifndef LOW_NUM
#define LOW_NUM 0
#define MID_NUM 8
#define HGH_NUM 16
#endif
                                if(d=='l') add=LOW_NUM;
                                else if(d=='m') add=MID_NUM;
                                else if(d=='h') add=HGH_NUM;
                                else goto badopt;

                                sprintf(buf,"/dev/rmt%d",add+c-'0');
#endif
                                if (n_ar_files == ar_files_len)
                                  ar_files 
                                    = (char **) 
                                      ck_malloc (sizeof (char *)
                                                 * (ar_files_len *= 2));
                                ar_files[n_ar_files++]=buf;
                        }
                        break;

                case 'A':       /* Arguments are tar files,
                                   just cat them onto the end
                                   of the archive.  */
                        if(cmd_mode!=CMD_NONE)
                                goto badopt;
                        cmd_mode=CMD_CAT;
                        break;

                case 'b':       /* Set blocking factor */
                        blocking = intconv(optarg);
                        break;

                case 'B':       /* Try to reblock input */
                        f_reblock++;            /* For reading 4.2BSD pipes */
                        break;

                case 'c':                       /* Create an archive */
                        if(cmd_mode!=CMD_NONE)
                                goto badopt;
                        cmd_mode=CMD_CREATE;
                        break;

#if 0
                case 'C':
                        if(chdir(optarg)<0)
                                msg_perror("Can't change directory to %d",optarg);
                        break;
#endif

                case 'd':       /* Find difference tape/disk */
                        if(cmd_mode!=CMD_NONE)
                                goto badopt;
                        cmd_mode=CMD_DIFF;
                        break;

                case 'f':       /* Use ar_file for the archive */
                        if (n_ar_files == ar_files_len)
                          ar_files
                            = (char **) ck_malloc (sizeof (char *)
                                                   * (ar_files_len *= 2));
                
                        ar_files[n_ar_files++] = optarg;
                        break;

                case 'F':
                        /* Since -F is only useful with -M , make it implied */
                        f_run_script_at_end++;  /* run this script at the end */
                        info_script = optarg;   /* of each tape */
                        f_multivol++;
                        break;

                case 'G':       /* We are making a GNU dump; save
                                   directories at the beginning of
                                   the archive, and include in each
                                   directory its contents */
                        if(f_oldarch)
                                goto badopt;
                        f_gnudump++;
                        gnu_dumpfile=0;
                        break;

                case 'h':
                        f_follow_links++;       /* follow symbolic links */
                        break;

                case 'i':
                        f_ignorez++;            /* Ignore zero records (eofs) */
                        /*
                         * This can't be the default, because Unix tar
                         * writes two records of zeros, then pads out the
                         * block with garbage.
                         */
                        break;

                case 'k':       /* Don't overwrite files */
#ifdef NO_OPEN3
                        msg("can't keep old files on this system");
                        exit(EX_ARGSBAD);
#else
                        f_keep++;
#endif
                        break;

                case 'K':
                        f_startfile++;
                        addname(optarg);
                        break;

                case 'l':       /* When dumping directories, don't
                                   dump files/subdirectories that are
                                   on other filesystems. */
                        f_local_filesys++;
                        break;

                case 'L':
                        tape_length = intconv (optarg);
                        f_multivol++;
                        break;
                case 'm':
                        f_modified++;
                        break;

                case 'M':       /* Make Multivolume archive:
                                   When we can't write any more
                                   into the archive, re-open it,
                                   and continue writing */
                        f_multivol++;
                        break;

                case 'N':       /* Only write files newer than X */
                get_newer:
                        f_new_files++;
                        new_time=get_date(optarg, (PTR) 0);
                        if (new_time == (time_t) -1) {
                          msg("invalid date format `%s'", optarg);
                          exit(EX_ARGSBAD);
                        }
                        break;

                case 'o':       /* Generate old archive */
                        if(f_gnudump /* || f_dironly */)
                                goto badopt;
                        f_oldarch++;
                        break;

                case 'O':
                        f_exstdout++;
                        break;

                case 'p':
                        f_use_protection++;
                        break;

                case 'P':
                        f_absolute_paths++;
                        break;

                case 'r':       /* Append files to the archive */
                        if(cmd_mode!=CMD_NONE)
                                goto badopt;
                        cmd_mode=CMD_APPEND;
                        break;

                case 'R':
                        f_sayblock++;           /* Print block #s for debug */
                        break;                  /* of bad tar archives */

                case 's':
                        f_sorted_names++;       /* Names to extr are sorted */
                        break;

                case 'S':                       /* deal with sparse files */
                        f_sparse_files++;
                        break;
                case 't':
                        if(cmd_mode!=CMD_NONE)
                                goto badopt;
                        cmd_mode=CMD_LIST;
                        f_verbose++;            /* "t" output == "cv" or "xv" */
                        break;

                case 'T':
                        name_file = optarg;
                        f_namefile++;
                        break;

                case 'u':       /* Append files to the archive that
                                   aren't there, or are newer than the
                                   copy in the archive */
                        if(cmd_mode!=CMD_NONE)
                                goto badopt;
                        cmd_mode=CMD_UPDATE;
                        break;

                case 'v':
                        f_verbose++;
                        break;

                case 'V':
                        f_volhdr=optarg;
                        break;

                case 'w':
                        f_confirm++;
                        break;

                case 'W':
                        f_verify++;
                        break;

                case 'x':       /* Extract files from the archive */
                        if(cmd_mode!=CMD_NONE)
                                goto badopt;
                        cmd_mode=CMD_EXTRACT;
                        break;

                case 'X':
                        f_exclude++;
                        add_exclude_file(optarg);
                        break;

                case 'z':               /* Easy to type */
                case 'Z':               /* Like the filename extension .Z */
                        f_compress++;
                        break;

                case '?':
                badopt:
                        msg("Unknown option.  Use '%s +help' for a complete list of options.", tar);
                        exit(EX_ARGSBAD);

                }
        }

        blocksize = blocking * RECORDSIZE;
        if (n_ar_files == 0)
          {
            n_ar_files = 1;
            ar_files[0] = getenv("TAPE");       /* From environment, or */
            if (ar_files[0] == 0)
              ar_files[0] = DEF_AR_FILE;        /* From Makefile */
          }
        if (n_ar_files > 1 && !f_multivol)
          {
            msg ("Multiple archive files requires --multi-volume\n");
            exit (EX_ARGSBAD);
          }
}


/*
 * Print as much help as the user's gonna get.
 *
 * We have to sprinkle in the KLUDGE lines because too many compilers
 * cannot handle character strings longer than about 512 bytes.  Yuk!
 * In particular, MS-DOS and Xenix MSC and PDP-11 V7 Unix have this
 * problem.
 */
void
describe()
{
        puts("choose one of the following:");
        fputs("\
-A, --catenate,\n\
    --concatenate       append tar files to an archive\n\
-c, --create            create a new archive\n\
-d, --diff,\n\
    --compare           find differences between archive and file system\n\
--delete                        delete from the archive (not for use on mag tapes!)\n\
-r, --append            append files to the end of an archive\n\
-t, --list              list the contents of an archive\n\
-u, --update            only append files that are newer than copy in archive\n\
-x, --extract,\n\
    --get               extract files from an archive\n",stdout);

        fprintf(stdout, "\
Other options:\n\
--atime-preserve        don't change access times on dumped files\n\
-b, --block-size N      block size of Nx512 bytes (default N=%d)\n", DEFBLOCKING);
        fputs ("\
-B, --read-full-blocks  reblock as we read (for reading 4.2BSD pipes)\n\
-C, --directory DIR     change to directory DIR\n\
--checkpoint            print directory names while reading the archive\n\
", stdout); /* KLUDGE */ fprintf(stdout, "\
-f, --file [HOSTNAME:]F use archive file or device F (default %s)\n",
                                 DEF_AR_FILE); fputs("\
--force-local           archive file is local even if has a colon\n\
-F, --info-script F     run script at end of each tape (implies -M)\n\
-G, --incremental       create/list/extract old GNU-format incremental backup\n\
-g, --listed-incremental F create/list/extract new GNU-format incremental backup\n\
-h, --dereference       don't dump symlinks; dump the files they point to\n\
-i, --ignore-zeros      ignore blocks of zeros in archive (normally mean EOF)\n\
--ignore-failed-read    don't exit with non-zero status on unreadable files\n\
-k, --keep-old-files    keep existing files; don't overwrite them from archive\n\
-K, --starting-file FILE        begin at FILE in the archive\n\
-l, --one-file-system   stay in local file system when creating an archive\n\
-L, --tape-length LENGTH change tapes after writing LENGTH\n\
", stdout); /* KLUDGE */ fputs("\
-m, --modification-time don't extract file modified time\n\
-M, --multi-volume      create/list/extract multi-volume archive\n\
-N, --after-date DATE,\n\
    --newer DATE                only store files newer than DATE\n\
-o, --old-archive,\n\
    --portability       write a V7 format archive, rather than ANSI format\n\
-O, --to-stdout         extract files to standard output\n\
-p, --same-permissions,\n\
    --preserve-permissions extract all protection information\n\
-P, --absolute-paths    don't strip leading `/'s from file names\n\
--preserve              like -p -s\n\
", stdout); /* KLUDGE */ fputs("\
-R, --record-number     show record number within archive with each message\n\
--remove-files          remove files after adding them to the archive\n\
-s, --same-order,\n\
    --preserve-order    list of names to extract is sorted to match archive\n\
--same-owner            create extracted files with the same ownership \n\
-S, --sparse            handle sparse files efficiently\n\
-T, --files-from F      get names to extract or create from file F\n\
--null                  -T reads null-terminated names, disable -C\n\
--totals                        print total bytes written with --create\n\
-v, --verbose           verbosely list files processed\n\
-V, --label NAME                create archive with volume name NAME\n\
--version               print tar program version number\n\
-w, --interactive,\n\
    --confirmation      ask for confirmation for every action\n\
", stdout); /* KLUDGE */ fputs("\
-W, --verify            attempt to verify the archive after writing it\n\
--exclude FILE          exclude file FILE\n\
-X, --exclude-from FILE exclude files listed in FILE\n\
-z, -Z, --compress,\n\
    --uncompress        filter the archive through compress\n\
-[0-7][lmh]             specify drive and density\n\
", stdout);
}

void
name_add(name)
char *name;
{
        if(n_indalloc==n_indused) {
                n_indalloc+=10;
                n_ind=(char **)(n_indused ? ck_realloc(n_ind,n_indalloc*sizeof(char *)) : ck_malloc(n_indalloc*sizeof(char *)));
        }
        n_ind[n_indused++]=name;
}
                
/*
 * Set up to gather file names for tar.
 *
 * They can either come from stdin or from argv.
 */
void
name_init(argc, argv)
        int     argc;
        char    **argv;
{

        if (f_namefile) {
                if (optind < argc) {
                        msg("too many args with -T option");
                        exit(EX_ARGSBAD);
                }
                if (!strcmp(name_file, "-")) {
                        namef = stdin;
                } else {
                        namef = fopen(name_file, "r");
                        if (namef == NULL) {
                                msg_perror("can't open file %s",name_file);
                                exit(EX_BADFILE);
                        }
                }
        } else {
                /* Get file names from argv, after options. */
                n_argc = argc;
                n_argv = argv;
        }
}

/* Read the next filename read from STREAM and null-terminate it.
   Put it into BUFFER, reallocating and adjusting *PBUFFER_SIZE if necessary.
   Return the new value for BUFFER, or NULL at end of file. */

char *
read_name_from_file (buffer, pbuffer_size, stream)
     char *buffer;
     size_t *pbuffer_size;
     FILE *stream;
{
  register int c;
  register int indx = 0;
  register size_t buffer_size = *pbuffer_size;

  while ((c = getc (stream)) != EOF && c != filename_terminator)
    {
      if (indx == buffer_size)
        {
          buffer_size += NAMSIZ;
          buffer = ck_realloc (buffer, buffer_size + 2);
        }
      buffer[indx++] = c;
    }
  if (indx == 0 && c == EOF)
    return NULL;
  if (indx == buffer_size)
    {
      buffer_size += NAMSIZ;
      buffer = ck_realloc (buffer, buffer_size + 2);
    }
  buffer[indx] = '\0';
  *pbuffer_size = buffer_size;
  return buffer;
}

/*
 * Get the next name from argv or the name file.
 *
 * Result is in static storage and can't be relied upon across two calls.
 *
 * If CHANGE_DIRS is non-zero, treat a filename of the form "-C" as
 * meaning that the next filename is the name of a directory to change to.
 * If `filename_terminator' is '\0', CHANGE_DIRS is effectively always 0.
 */

char *
name_next(change_dirs)
     int change_dirs;
{
        static char     *buffer;        /* Holding pattern */
        static int buffer_siz;
        register char   *p;
        register char   *q = 0;
        register int    next_name_is_dir = 0;
        extern char *un_quote_string();

        if(buffer_siz==0) {
                buffer=ck_malloc(NAMSIZ+2);
                buffer_siz=NAMSIZ;
        }
        if (filename_terminator == '\0')
                change_dirs = 0;
 tryagain:
        if (namef == NULL) {
                if(n_indscan<n_indused)
                        p=n_ind[n_indscan++];
                else if (optind < n_argc)               
                        /* Names come from argv, after options */
                        p=n_argv[optind++];
                else {
                        if(q)
                                msg("Missing filename after -C");
                        return NULL;
                }

                /* JF trivial support for -C option.  I don't know if
                   chdir'ing at this point is dangerous or not.
                   It seems to work, which is all I ask. */
                if(change_dirs && !q && p[0]=='-' && p[1]=='C' && p[2]=='\0') {
                        q=p;
                        goto tryagain;
                }
                if(q) {
                        if(chdir(p)<0)
                                msg_perror("Can't chdir to %s",p);
                        q=0;
                        goto tryagain;
                }
                /* End of JF quick -C hack */

                if(f_exclude && check_exclude(p))
                        goto tryagain;
                return un_quote_string(p);
        }
        while (p = read_name_from_file (buffer, &buffer_siz, namef)) {
                buffer = p;
                if (*p == '\0')
                        continue; /* Ignore empty lines. */
                q = p + strlen (p) - 1;
                while (q > p && *q == '/')      /* Zap trailing "/"s. */
                        *q-- = '\0';
                if (change_dirs && next_name_is_dir == 0
                    && p[0] == '-' && p[1] == 'C' && p[2] == '\0') {
                        next_name_is_dir = 1;
                        goto tryagain;
                }
                if (next_name_is_dir) {
                        if (chdir (p) < 0)
                                msg_perror ("Can't change to directory %s", p);
                        next_name_is_dir = 0;
                        goto tryagain;
                }
                if(f_exclude && check_exclude(p))
                        goto tryagain;
                return un_quote_string(p);
        }
        return NULL;
}


/*
 * Close the name file, if any.
 */
void
name_close()
{

        if (namef != NULL && namef != stdin) fclose(namef);
}


/*
 * Gather names in a list for scanning.
 * Could hash them later if we really care.
 *
 * If the names are already sorted to match the archive, we just
 * read them one by one.  name_gather reads the first one, and it
 * is called by name_match as appropriate to read the next ones.
 * At EOF, the last name read is just left in the buffer.
 * This option lets users of small machines extract an arbitrary
 * number of files by doing "tar t" and editing down the list of files.
 */
void
name_gather()
{
        register char *p;
        static struct name *namebuf;    /* One-name buffer */
        static namelen;
        static char *chdir_name;

        if (f_sorted_names) {
                if(!namelen) {
                        namelen=NAMSIZ;
                        namebuf=(struct name *)ck_malloc(sizeof(struct name)+NAMSIZ);
                }
                p = name_next(0);
                if (p) {
                        if(*p=='-' && p[1]=='C' && p[2]=='\0') {
                                chdir_name=name_next(0);
                                p=name_next(0);
                                if(!p) {
                                        msg("Missing file name after -C");
                                        exit(EX_ARGSBAD);
                                }
                                namebuf->change_dir=chdir_name;
                        }
                        namebuf->length = strlen(p);
                        if (namebuf->length >= namelen) {
                                namebuf=(struct name *)ck_realloc(namebuf,sizeof(struct name)+namebuf->length);
                                namelen=namebuf->length;
                        }
                        strncpy(namebuf->name, p, namebuf->length);
                        namebuf->name[ namebuf->length ] = 0;
                        namebuf->next = (struct name *)NULL;
                        namebuf->found = 0;
                        namelist = namebuf;
                        namelast = namelist;
                }
                return;
        }

        /* Non sorted names -- read them all in */
        while (p = name_next(0))
                addname(p);
}

/*
 * Add a name to the namelist.
 */
void
addname(name)
        char    *name;                  /* pointer to name */
{
        register int    i;              /* Length of string */
        register struct name    *p;     /* Current struct pointer */
        static char *chdir_name;
        char *new_name();

        if(name[0]=='-' && name[1]=='C' && name[2]=='\0') {
                chdir_name=name_next(0);
                name=name_next(0);
                if(!chdir_name) {
                        msg("Missing file name after -C");
                        exit(EX_ARGSBAD);
                }
                if(chdir_name[0]!='/') {
                        char *path = ck_malloc(PATH_MAX);
#if defined(__MSDOS__) || defined(USG) || defined(_POSIX_VERSION)
                        if(!getcwd(path,PATH_MAX))
                                msg("Couldn't get current directory.");
                                exit(EX_SYSTEM);
#else
                        char *getwd();

                        if(!getwd(path)) {
                                msg("Couldn't get current directory: %s",path);
                                exit(EX_SYSTEM);
                        }
#endif
                        chdir_name=new_name(path,chdir_name);
                        free(path);
                }
        }

        if (name)
          {
            i = strlen(name);
            /*NOSTRICT*/
            p = (struct name *)malloc((unsigned)(sizeof(struct name) + i));
          }
        else
          p = (struct name *)malloc ((unsigned)(sizeof (struct name)));
        if (!p) {
          if (name)
            msg("cannot allocate mem for name '%s'.",name);
          else
            msg("cannot allocate mem for chdir record.");
          exit(EX_SYSTEM);
        }
        p->next = (struct name *)NULL;
        if (name)
          {
            p->fake = 0;
            p->length = i;
            strncpy(p->name, name, i);
            p->name[i] = '\0';  /* Null term */
          }
        else
          p->fake = 1;
        p->found = 0;
        p->regexp = 0;          /* Assume not a regular expression */
        p->firstch = 1;         /* Assume first char is literal */
        p->change_dir=chdir_name;
        p->dir_contents = 0;    /* JF */
        if (name)
          {
            if (index(name, '*') || index(name, '[') || index(name, '?')) {
              p->regexp = 1;    /* No, it's a regexp */
              if (name[0] == '*' || name[0] == '[' || name[0] == '?')
                p->firstch = 0;         /* Not even 1st char literal */
            }
          }

        if (namelast) namelast->next = p;
        namelast = p;
        if (!namelist) namelist = p;
}

/*
 * Return nonzero if name P (from an archive) matches any name from
 * the namelist, zero if not.
 */
int
name_match(p)
        register char *p;
{
        register struct name    *nlp;
        register int            len;

again:
        if (0 == (nlp = namelist))      /* Empty namelist is easy */
                return 1;
        if (nlp->fake)
          {
            if (nlp->change_dir && chdir (nlp->change_dir))
              msg_perror ("Can't change to directory %d", nlp->change_dir);
            namelist = 0;
            return 1;
          }
        len = strlen(p);
        for (; nlp != 0; nlp = nlp->next) {
                /* If first chars don't match, quick skip */
                if (nlp->firstch && nlp->name[0] != p[0])
                        continue;

                /* Regular expressions (shell globbing, actually). */
                if (nlp->regexp) {
                        if (wildmat(p, nlp->name)) {
                                nlp->found = 1; /* Remember it matched */
                                if(f_startfile) {
                                        free((void *)namelist);
                                        namelist=0;
                                }
                                if(nlp->change_dir && chdir(nlp->change_dir))
                                        msg_perror("Can't change to directory %s",nlp->change_dir);
                                return 1;       /* We got a match */
                        }
                        continue;
                }

                /* Plain Old Strings */
                if (nlp->length <= len          /* Archive len >= specified */
                 && (p[nlp->length] == '\0' || p[nlp->length] == '/')
                                                /* Full match on file/dirname */
                 && strncmp(p, nlp->name, nlp->length) == 0) /* Name compare */
                {
                        nlp->found = 1;         /* Remember it matched */
                        if(f_startfile) {
                                free((void *)namelist);
                                namelist = 0;
                        }
                        if(nlp->change_dir && chdir(nlp->change_dir))
                                msg_perror("Can't change to directory %s",nlp->change_dir);
                        return 1;               /* We got a match */
                }
        }

        /*
         * Filename from archive not found in namelist.
         * If we have the whole namelist here, just return 0.
         * Otherwise, read the next name in and compare it.
         * If this was the last name, namelist->found will remain on.
         * If not, we loop to compare the newly read name.
         */
        if (f_sorted_names && namelist->found) {
                name_gather();          /* Read one more */
                if (!namelist->found) goto again;
        }
        return 0;
}


/*
 * Print the names of things in the namelist that were not matched.
 */
void
names_notfound()
{
        register struct name    *nlp,*next;
        register char           *p;

        for (nlp = namelist; nlp != 0; nlp = next) {
                next=nlp->next;
                if (!nlp->found)
                        msg("%s not found in archive",nlp->name);

                /*
                 * We could free() the list, but the process is about
                 * to die anyway, so save some CPU time.  Amigas and
                 * other similarly broken software will need to waste
                 * the time, though.
                 */
#ifdef amiga
                if (!f_sorted_names)
                        free(nlp);
#endif
        }
        namelist = (struct name *)NULL;
        namelast = (struct name *)NULL;

        if (f_sorted_names) {
                while (0 != (p = name_next(1)))
                        msg("%s not found in archive", p);
        }
}

/* These next routines were created by JF */

void
name_expand()
{
;
}

/* This is like name_match(), except that it returns a pointer to the name
   it matched, and doesn't set ->found  The caller will have to do that
   if it wants to.  Oh, and if the namelist is empty, it returns 0, unlike
   name_match(), which returns TRUE */

struct name *
name_scan(p)
register char *p;
{
        register struct name    *nlp;
        register int            len;

again:
        if (0 == (nlp = namelist))      /* Empty namelist is easy */
                return 0;
        len = strlen(p);
        for (; nlp != 0; nlp = nlp->next) {
                /* If first chars don't match, quick skip */
                if (nlp->firstch && nlp->name[0] != p[0])
                        continue;

                /* Regular expressions */
                if (nlp->regexp) {
                        if (wildmat(p, nlp->name))
                                return nlp;     /* We got a match */
                        continue;
                }

                /* Plain Old Strings */
                if (nlp->length <= len          /* Archive len >= specified */
                 && (p[nlp->length] == '\0' || p[nlp->length] == '/')
                                                /* Full match on file/dirname */
                 && strncmp(p, nlp->name, nlp->length) == 0) /* Name compare */
                        return nlp;             /* We got a match */
        }

        /*
         * Filename from archive not found in namelist.
         * If we have the whole namelist here, just return 0.
         * Otherwise, read the next name in and compare it.
         * If this was the last name, namelist->found will remain on.
         * If not, we loop to compare the newly read name.
         */
        if (f_sorted_names && namelist->found) {
                name_gather();          /* Read one more */
                if (!namelist->found) goto again;
        }
        return (struct name *) 0;
}

/* This returns a name from the namelist which doesn't have ->found set.
   It sets ->found before returning, so successive calls will find and return
   all the non-found names in the namelist */

struct name *gnu_list_name;

char *
name_from_list()
{
        if(!gnu_list_name)
                gnu_list_name = namelist;
        while(gnu_list_name && gnu_list_name->found)
                gnu_list_name=gnu_list_name->next;
        if(gnu_list_name) {
                gnu_list_name->found++;
                if(gnu_list_name->change_dir)
                        if(chdir(gnu_list_name->change_dir)<0)
                                msg_perror("can't chdir to %s",gnu_list_name->change_dir);
                return gnu_list_name->name;
        }
        return (char *)0;
}

void
blank_name_list()
{
        struct name *n;

        gnu_list_name = 0;
        for(n=namelist;n;n=n->next)
                n->found = 0;
}

char *
new_name(path,name)
char *path,*name;
{
        char *path_buf;

        path_buf=(char *)malloc(strlen(path)+strlen(name)+2);
        if(path_buf==0) {
                msg("Can't allocate memory for name '%s/%s",path,name);
                exit(EX_SYSTEM);
        }
        (void) sprintf(path_buf,"%s/%s",path,name);
        return path_buf;
}

/* returns non-zero if the luser typed 'y' or 'Y', zero otherwise. */

int
confirm(action,file)
char *action, *file;
{
        int     c,nl;
        static FILE *confirm_file = 0;
        extern FILE *msg_file;
        extern char TTY_NAME[];

        fprintf(msg_file,"%s %s?", action, file);
        fflush(msg_file);
        if(!confirm_file) {
                confirm_file = (archive == 0) ? fopen(TTY_NAME, "r") : stdin;
                if(!confirm_file) {
                        msg("Can't read confirmation from user");
                        exit(EX_SYSTEM);
                }
        }
        c=getc(confirm_file);
        for(nl = c; nl != '\n' && nl != EOF; nl = getc(confirm_file))
                ;
        return (c=='y' || c=='Y');
}

char *x_buffer = 0;
int size_x_buffer;
int free_x_buffer;

char **exclude = 0;
int size_exclude = 0;
int free_exclude = 0;

char **re_exclude = 0;
int size_re_exclude = 0;
int free_re_exclude = 0;

void
add_exclude(name)
char *name;
{
/*      char *rname;*/
/*      char **tmp_ptr;*/
        int size_buf;

        un_quote_string(name);
        size_buf = strlen(name);

        if(x_buffer==0) {
                x_buffer = (char *)ck_malloc(size_buf+1024);
                free_x_buffer=1024;
        } else if(free_x_buffer<=size_buf) {
                char *old_x_buffer;
                char **tmp_ptr;

                old_x_buffer = x_buffer;
                x_buffer = (char *)ck_realloc(x_buffer,size_x_buffer+1024);
                free_x_buffer = 1024;
                for(tmp_ptr=exclude;tmp_ptr<exclude+size_exclude;tmp_ptr++)
                        *tmp_ptr= x_buffer + ((*tmp_ptr) - old_x_buffer);
                for(tmp_ptr=re_exclude;tmp_ptr<re_exclude+size_re_exclude;tmp_ptr++)
                        *tmp_ptr= x_buffer + ((*tmp_ptr) - old_x_buffer);
        }

        if(is_regex(name)) {
                if(free_re_exclude==0) {
                        re_exclude= (char **)(re_exclude ? ck_realloc(re_exclude,(size_re_exclude+32)*sizeof(char *)) : ck_malloc(sizeof(char *)*32));
                        free_re_exclude+=32;
                }
                re_exclude[size_re_exclude]=x_buffer+size_x_buffer;
                size_re_exclude++;
                free_re_exclude--;
        } else {
                if(free_exclude==0) {
                        exclude=(char **)(exclude ? ck_realloc(exclude,(size_exclude+32)*sizeof(char *)) : ck_malloc(sizeof(char *)*32));
                        free_exclude+=32;
                }
                exclude[size_exclude]=x_buffer+size_x_buffer;
                size_exclude++;
                free_exclude--;
        }
        strcpy(x_buffer+size_x_buffer,name);
        size_x_buffer+=size_buf+1;
        free_x_buffer-=size_buf+1;
}

void
add_exclude_file(file)
char *file;
{
        FILE *fp;
        char buf[1024];
        extern char *rindex();

        if(strcmp(file, "-"))
                fp=fopen(file,"r");
        else
                /* Let's hope the person knows what they're doing. */
                /* Using -X - -T - -f - will get you *REALLY* strange
                   results. . . */
                fp=stdin;

        if(!fp) {
                msg_perror("can't open %s",file);
                exit(2);
        }
        while(fgets(buf,1024,fp)) {
/*              int size_buf;*/
                char *end_str;

                end_str=rindex(buf,'\n');
                if(end_str)
                        *end_str='\0';
                add_exclude(buf);

        }
        fclose(fp);
}

int
is_regex(str)
char *str;
{
        return index(str,'*') || index(str,'[') || index(str,'?');
}

/* Returns non-zero if the file 'name' should not be added/extracted */
int
check_exclude(name)
char *name;
{
        int n;
        char *str;
        extern char *strstr();

        for(n=0;n<size_re_exclude;n++) {
                if(wildmat(name,re_exclude[n]))
                        return 1;
        }
        for(n=0;n<size_exclude;n++) {
                /* Accept the output from strstr only if it is the last
                   part of the string.  There is certainly a faster way to
                   do this. . . */
                if(   (str=strstr(name,exclude[n]))
                   && (str==name || str[-1]=='/')
                   && str[strlen(exclude[n])]=='\0')
                        return 1;
        }
        return 0;
}