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

   1 /* Declarations for tar archives.
   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 #include "testpad.h"
  21
  22 /* major() and minor() macros (among other things) defined here for hpux */
  23 #ifdef hpux
  24 #include <sys/mknod.h>
  25 #endif
  26
  27 /*
  28  * Kludge for handling systems that can't cope with multiple
  29  * external definitions of a variable.  In ONE routine (tar.c),
  30  * we #define TAR_EXTERN to null; here, we set it to "extern" if
  31  * it is not already set.
  32  */
  33 #ifndef TAR_EXTERN
  34 #define TAR_EXTERN extern
  35 #endif
  36
  37 /*
  38  * Header block on tape.
  39  *
  40  * I'm going to use traditional DP naming conventions here.
  41  * A "block" is a big chunk of stuff that we do I/O on.
  42  * A "record" is a piece of info that we care about.
  43  * Typically many "record"s fit into a "block".
  44  */
  45 #define RECORDSIZE      512
  46 #define NAMSIZ          100
  47 #define TUNMLEN         32
  48 #define TGNMLEN         32
  49 #define SPARSE_EXT_HDR  21
  50 #define SPARSE_IN_HDR   4
  51
  52 struct sparse {
  53         char offset[12];
  54         char numbytes[12];
  55 };
  56
  57 struct sp_array {
  58         int offset;
  59         int numbytes;
  60 };
  61
  62 union record {
  63         char            charptr[RECORDSIZE];
  64         struct header {
  65                 char    arch_name[NAMSIZ];
  66                 char    mode[8];
  67                 char    uid[8];
  68                 char    gid[8];
  69                 char    size[12];
  70                 char    mtime[12];
  71                 char    chksum[8];
  72                 char    linkflag;
  73                 char    arch_linkname[NAMSIZ];
  74                 char    magic[8];
  75                 char    uname[TUNMLEN];
  76                 char    gname[TGNMLEN];
  77                 char    devmajor[8];
  78                 char    devminor[8];
  79                 /* these following fields were added by JF for gnu */
  80                 /* and are NOT standard */
  81                 char    atime[12];
  82                 char    ctime[12];
  83                 char    offset[12];
  84                 char    longnames[4];
  85 #ifdef NEEDPAD
  86                 char    pad;
  87 #endif
  88                 struct  sparse sp[SPARSE_IN_HDR];
  89                 char    isextended;
  90                 char    realsize[12];           /* true size of the sparse file */
  91 /*              char    ending_blanks[12];*/    /* number of nulls at the
  92                                                    end of the file, if any */
  93         } header;
  94         struct extended_header {
  95                 struct sparse sp[21];
  96                 char isextended;
  97         } ext_hdr;
  98 };
  99
 100 /* The checksum field is filled with this while the checksum is computed. */
 101 #define CHKBLANKS       "        "      /* 8 blanks, no null */
 102
 103 /* The magic field is filled with this if uname and gname are valid. */
 104 #define TMAGIC          "ustar  "       /* 7 chars and a null */
 105
 106 /* The linkflag defines the type of file */
 107 #define LF_OLDNORMAL    '\0'            /* Normal disk file, Unix compat */
 108 #define LF_NORMAL       '0'             /* Normal disk file */
 109 #define LF_LINK         '1'             /* Link to previously dumped file */
 110 #define LF_SYMLINK      '2'             /* Symbolic link */
 111 #define LF_CHR          '3'             /* Character special file */
 112 #define LF_BLK          '4'             /* Block special file */
 113 #define LF_DIR          '5'             /* Directory */
 114 #define LF_FIFO         '6'             /* FIFO special file */
 115 #define LF_CONTIG       '7'             /* Contiguous file */
 116 /* Further link types may be defined later. */
 117
 118 /* Note that the standards committee allows only capital A through
 119    capital Z for user-defined expansion.  This means that defining something
 120    as, say '8' is a *bad* idea. */
 121 #define LF_DUMPDIR      'D'             /* This is a dir entry that contains
 122                                            the names of files that were in
 123                                            the dir at the time the dump
 124                                            was made */
 125 #define LF_LONGLINK     'K'             /* Identifies the NEXT file on the tape
 126                                            as having a long linkname */
 127 #define LF_LONGNAME     'L'             /* Identifies the NEXT file on the tape
 128                                            as having a long name. */
 129 #define LF_MULTIVOL     'M'             /* This is the continuation
 130                                            of a file that began on another
 131                                            volume */
 132 #define LF_NAMES        'N'             /* For storing filenames that didn't
 133                                            fit in 100 characters */
 134 #define LF_SPARSE       'S'             /* This is for sparse files */
 135 #define LF_VOLHDR       'V'             /* This file is a tape/volume header */
 136                                         /* Ignore it on extraction */
 137
 138 /*
 139  * Exit codes from the "tar" program
 140  */
 141 #define EX_SUCCESS      0               /* success! */
 142 #define EX_ARGSBAD      1               /* invalid args */
 143 #define EX_BADFILE      2               /* invalid filename */
 144 #define EX_BADARCH      3               /* bad archive */
 145 #define EX_SYSTEM       4               /* system gave unexpected error */
 146 #define EX_BADVOL       5               /* Special error code means
 147                                            Tape volume doesn't match the one
 148                                            specified on the command line */
 149
 150 /*
 151  * Global variables
 152  */
 153 TAR_EXTERN union record *ar_block;      /* Start of block of archive */
 154 TAR_EXTERN union record *ar_record;     /* Current record of archive */
 155 TAR_EXTERN union record *ar_last;       /* Last+1 record of archive block */
 156 TAR_EXTERN char         ar_reading;     /* 0 writing, !0 reading archive */
 157 TAR_EXTERN int          blocking;       /* Size of each block, in records */
 158 TAR_EXTERN int          blocksize;      /* Size of each block, in bytes */
 159 TAR_EXTERN char         *info_script;   /* Script to run at end of each tape change */
 160 TAR_EXTERN char         *name_file;     /* File containing names to work on */
 161 TAR_EXTERN char         filename_terminator; /* \n or \0. */
 162 TAR_EXTERN char         *tar;           /* Name of this program */
 163 TAR_EXTERN struct sp_array *sparsearray;/* Pointer to the start of the scratch space */
 164 TAR_EXTERN int          sp_array_size;  /* Initial size of the sparsearray */
 165 TAR_EXTERN int          tot_written;    /* Total written to output */
 166 TAR_EXTERN struct re_pattern_buffer
 167                         *label_pattern; /* compiled regex for extract label */
 168 TAR_EXTERN char         **ar_files;     /* list of tape drive names */
 169 TAR_EXTERN int          n_ar_files;     /* number of tape drive names */
 170 TAR_EXTERN int          cur_ar_file;    /* tape drive currently being used */
 171 TAR_EXTERN int          ar_files_len;   /* malloced size of ar_files */
 172 TAR_EXTERN char         *current_file_name, *current_link_name;
 173
 174 /*
 175  * Flags from the command line
 176  */
 177 TAR_EXTERN int cmd_mode;
 178 #define CMD_NONE        0
 179 #define CMD_CAT         1               /* -A */
 180 #define CMD_CREATE      2               /* -c */
 181 #define CMD_DIFF        3               /* -d */
 182 #define CMD_APPEND      4               /* -r */
 183 #define CMD_LIST        5               /* -t */
 184 #define CMD_UPDATE      6               /* -u */
 185 #define CMD_EXTRACT     7               /* -x */
 186 #define CMD_DELETE      8               /* -D */
 187 #define CMD_VERSION     9               /* --version */
 188
 189                                         /* -[0-9][lmh] */
 190                         /* CMD_CAT         -A */
 191                                         /* -b */
 192 TAR_EXTERN int  f_reblock;              /* -B */
 193                         /* CMD_CREATE      -c */
 194                                         /* -C */
 195                         /* CMD_DIFF        -d */
 196 #if 0
 197 TAR_EXTERN char f_dironly;              /* -D */
 198 #endif
 199                                         /* -f */
 200 TAR_EXTERN int  f_run_script_at_end;    /* -F */
 201 TAR_EXTERN int  f_gnudump;              /* -G */
 202 TAR_EXTERN int  f_follow_links;         /* -h */
 203 TAR_EXTERN int  f_ignorez;              /* -i */
 204                         /* CMD_DELETE      -J */
 205 TAR_EXTERN int  f_keep;                 /* -k */
 206 TAR_EXTERN int  f_startfile;            /* -K */
 207 TAR_EXTERN int  f_local_filesys;        /* -l */
 208 TAR_EXTERN int  tape_length;            /* -L */
 209 TAR_EXTERN int  f_modified;             /* -m */
 210 TAR_EXTERN int  f_multivol;             /* -M */
 211 TAR_EXTERN int  f_new_files;            /* -N */
 212 TAR_EXTERN int  f_oldarch;              /* -o */
 213 TAR_EXTERN int  f_exstdout;             /* -O */
 214 TAR_EXTERN int  f_use_protection;       /* -p */
 215 TAR_EXTERN int  f_absolute_paths;       /* -P */
 216 TAR_EXTERN int  f_sayblock;             /* -R */
 217 TAR_EXTERN int  f_sorted_names;         /* -s */
 218 TAR_EXTERN int  f_sparse_files;         /* -S  ... JK */
 219 TAR_EXTERN int  f_namefile;             /* -T */
 220                         /* CMD_UPDATE      -u */
 221 TAR_EXTERN int  f_verbose;              /* -v */
 222 TAR_EXTERN char *f_volhdr;              /* -V */
 223 TAR_EXTERN int  f_confirm;              /* -w */
 224 TAR_EXTERN int  f_verify;               /* -W */
 225                         /* CMD_EXTRACT     -x */
 226 TAR_EXTERN int  f_exclude;              /* -X */
 227 TAR_EXTERN int  f_compress;             /* -z */
 228                                         /* -Z */
 229 TAR_EXTERN int  f_do_chown;             /* --do-chown */
 230 TAR_EXTERN int  f_totals;               /* --totals */
 231 TAR_EXTERN int  f_remove_files;         /* --remove-files */
 232 TAR_EXTERN int  f_ignore_failed_read;   /* --ignore-failed-read */
 233 TAR_EXTERN int  f_checkpoint;           /* --checkpoint */
 234 TAR_EXTERN int  f_show_omitted_dirs;    /* --show-omitted-dirs */
 235 TAR_EXTERN char *f_volno_file;          /* --volno-file */
 236 TAR_EXTERN int  f_force_local;          /* --force-local */
 237 TAR_EXTERN int  f_atime_preserve;       /* --atime-preserve */
 238
 239 /*
 240  * We default to Unix Standard format rather than 4.2BSD tar format.
 241  * The code can actually produce all three:
 242  *      f_standard      ANSI standard
 243  *      f_oldarch       V7
 244  *      neither         4.2BSD
 245  * but we don't bother, since 4.2BSD can read ANSI standard format anyway.
 246  * The only advantage to the "neither" option is that we can cmp our
 247  * output to the output of 4.2BSD tar, for debugging.
 248  */
 249 #define         f_standard              (!f_oldarch)
 250
 251 /*
 252  * Structure for keeping track of filenames and lists thereof.
 253  */
 254 struct name {
 255         struct name     *next;
 256         short           length;         /* cached strlen(name) */
 257         char            found;          /* A matching file has been found */
 258         char            firstch;        /* First char is literally matched */
 259         char            regexp;         /* This name is a regexp, not literal */
 260         char            *change_dir;    /* JF set with the -C option */
 261         char            *dir_contents;  /* JF for f_gnudump */
 262         char            fake;           /* dummy entry */
 263         char            name[1];
 264 };
 265
 266 TAR_EXTERN struct name  *namelist;      /* Points to first name in list */
 267 TAR_EXTERN struct name  *namelast;      /* Points to last name in list */
 268
 269 TAR_EXTERN int          archive;        /* File descriptor for archive file */
 270 TAR_EXTERN int          errors;         /* # of files in error */
 271
 272 TAR_EXTERN char *gnu_dumpfile;
 273
 274 /*
 275  * Error recovery stuff
 276  */
 277 TAR_EXTERN char         read_error_flag;
 278
 279
 280 /*
 281  * Declarations of functions available to the world.
 282  */
 283 union record *findrec();
 284 void userec();
 285 union record *endofrecs();
 286 void anno();
 287
 288 #if defined (HAVE_VPRINTF) && __STDC__
 289 void msg(char *, ...);
 290 void msg_perror(char *, ...);
 291 #else
 292 void msg();
 293 void msg_perror();
 294 #endif