file/src/tar.h

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/*
 * Copyright (c) Ian F. Darwin 1986-1995.
 * Software written by Ian F. Darwin and others;
 * maintained 1995-present by Christos Zoulas and others.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice immediately at the beginning of the file, without modification,
 *    this list of conditions, and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *  
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */
/*
 * Header file for public domain tar (tape archive) program.
 *
 * @(#)tar.h 1.20 86/10/29      Public Domain.
 *
 * Created 25 August 1985 by John Gilmore, ihnp4!hoptoad!gnu.
 *
 * $File: tar.h,v 1.11 2007/01/16 14:56:45 ljt Exp $ # checkin only
 */

/*
 * Kludge for handling systems that cannot cope with multiple
 * external definitions of a variable.  In ONE routine (tar.c),
 * we #define TAR_EXTERN to null; here, we set it to "extern" if
 * it is not already set.
 */
#ifndef TAR_EXTERN
#define TAR_EXTERN extern
#endif

/*
 * Header block on tape.
 *
 * I'm going to use traditional DP naming conventions here.
 * A "block" is a big chunk of stuff that we do I/O on.
 * A "record" is a piece of info that we care about.
 * Typically many "record"s fit into a "block".
 */
#define RECORDSIZE      512
#define NAMSIZ  100
#define TUNMLEN 32
#define TGNMLEN 32

union record {
        char            charptr[RECORDSIZE];
        struct header {
                char    name[NAMSIZ];
                char    mode[8];
                char    uid[8];
                char    gid[8];
                char    size[12];
                char    mtime[12];
                char    chksum[8];
                char    linkflag;
                char    linkname[NAMSIZ];
                char    magic[8];
                char    uname[TUNMLEN];
                char    gname[TGNMLEN];
                char    devmajor[8];
                char    devminor[8];
        } header;
};

/* The checksum field is filled with this while the checksum is computed. */
#define CHKBLANKS       "        "      /* 8 blanks, no null */

/* The magic field is filled with this if uname and gname are valid. */
#define TMAGIC          "ustar"         /* 5 chars and a null */
#define GNUTMAGIC       "ustar  "       /* 7 chars and a null */

/* The linkflag defines the type of file */
#define LF_OLDNORMAL    '\0'            /* Normal disk file, Unix compat */
#define LF_NORMAL       '0'             /* Normal disk file */
#define LF_LINK         '1'             /* Link to previously dumped file */
#define LF_SYMLINK      '2'             /* Symbolic link */
#define LF_CHR          '3'             /* Character special file */
#define LF_BLK          '4'             /* Block special file */
#define LF_DIR          '5'             /* Directory */
#define LF_FIFO         '6'             /* FIFO special file */
#define LF_CONTIG       '7'             /* Contiguous file */
/* Further link types may be defined later. */

/*
 * Exit codes from the "tar" program
 */
#define EX_SUCCESS      0               /* success! */
#define EX_ARGSBAD      1               /* invalid args */
#define EX_BADFILE      2               /* invalid filename */
#define EX_BADARCH      3               /* bad archive */
#define EX_SYSTEM       4               /* system gave unexpected error */

/*
 * Structure for keeping track of filenames and lists thereof.
 */
struct name {
        struct name     *next;
        short           length;
        char            found;
        char            name[NAMSIZ+1];
};

/*
 *
 * Due to the next struct declaration, each routine that includes
 * "tar.h" must also include <sys/types.h>.  I tried to make it automatic,
 * but System V has no defines in <sys/types.h>, so there is no way of
 * knowing when it has been included.  In addition, it cannot be included
 * twice, but must be included exactly once.  Argghh!
 *
 * Thanks, typedef.  Thanks, USG.
 */
struct link {
        struct link     *next;
        dev_t           dev;
        ino_t           ino;
        short           linkcount;
        char            name[NAMSIZ+1];
};

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