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/*

	Copyright (C) 1988 Free Software Foundation

GNU tar is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY.  No author or distributor accepts responsibility to anyone
for the consequences of using it or for whether it serves any
particular purpose or works at all, unless he says so in writing.
Refer to the GNU tar General Public License for full details.

Everyone is granted permission to copy, modify and redistribute GNU tar,
but only under the conditions described in the GNU tar General Public
License.  A copy of this license is supposed to have been given to you
along with GNU tar so you can know your rights and responsibilities.  It
should be in a file named COPYING.  Among other things, the copyright
notice and this notice must be preserved on all copies.

In other words, go ahead and share GNU tar, but don't try to stop
anyone else from sharing it farther.  Help stamp out software hoarding!
*/

/*
 * Header file for tar (tape archive) program.
 *
 * @(#)tar.h 1.24 87/11/06
 *
 * Created 25 August 1985 by John Gilmore, ihnp4!hoptoad!gnu.
 */

/*
 * Kludge for handling systems that can't 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];
		/* these following fields were added by JF for gnu */
		/* and are NOT standard */
		char	atime[12];
		char	ctime[12];
		char	offset[12];
		char	longnames[4];
	} 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  "	/* 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. */

#define LF_DUMPDIR	'D'		/* This is a dir entry that contains
					   the names of files that were in
					   the dir at the time the dump
					   was made */
#define LF_MULTIVOL	'M'		/* This is the continuation
					   of a file that began on another
					   volume */
#define LF_VOLHDR	'V'		/* This file is a tape/volume header */
					/* Ignore it on extraction */

/*
 * 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 */


/*
 * Global variables
 */
TAR_EXTERN union record	*ar_block;	/* Start of block of archive */
TAR_EXTERN union record	*ar_record;	/* Current record of archive */
TAR_EXTERN union record	*ar_last;	/* Last+1 record of archive block */
TAR_EXTERN char		ar_reading;	/* 0 writing, !0 reading archive */
TAR_EXTERN int		blocking;	/* Size of each block, in records */
TAR_EXTERN int		blocksize;	/* Size of each block, in bytes */
TAR_EXTERN char		*ar_file;	/* File containing archive */
TAR_EXTERN char		*name_file;	/* File containing names to work on */
TAR_EXTERN char		*tar;		/* Name of this program */

/*
 * Flags from the command line
 */
TAR_EXTERN int cmd_mode;
#define CMD_NONE	0
#define CMD_CAT		1		/* -A */
#define CMD_CREATE	2		/* -c */
#define CMD_DIFF	3		/* -d */
#define CMD_APPEND	4		/* -r */
#define CMD_LIST	5		/* -t */
#define CMD_UPDATE	6		/* -u */
#define CMD_EXTRACT	7		/* -x */
#define CMD_DELETE	8		/* -D */

					/* -[0-9][lmh] */
			/* CMD_CAT	   -A */
					/* -b */
TAR_EXTERN char	f_reblock;		/* -B */
			/* CMD_CREATE	   -c */
					/* -C */
			/* CMD_DIFF	   -d */
/* TAR_EXTERN char	f_dironly;	/* -D */
					/* -f */
TAR_EXTERN char f_gnudump;		/* -G */
TAR_EXTERN char	f_follow_links;		/* -h */
TAR_EXTERN char	f_ignorez;		/* -i */
			/* CMD_DELETE	   -J */
TAR_EXTERN char	f_keep;			/* -k */
TAR_EXTERN char f_startfile;		/* -K */
TAR_EXTERN char f_local_filesys;	/* -l */
TAR_EXTERN char	f_modified;		/* -m */
TAR_EXTERN char f_multivol;		/* -M */
TAR_EXTERN char f_new_files;		/* -N */
TAR_EXTERN char	f_oldarch;		/* -o */
TAR_EXTERN char f_exstdout;		/* -O */
TAR_EXTERN char	f_use_protection;	/* -p */
TAR_EXTERN char f_absolute_paths;	/* -P */
TAR_EXTERN char	f_sayblock;		/* -R */
TAR_EXTERN char	f_sorted_names;		/* -s */
TAR_EXTERN char	f_namefile;		/* -T */
			/* CMD_UPDATE	   -u */
TAR_EXTERN char	f_verbose;		/* -v */
TAR_EXTERN char *f_volhdr;		/* -V */
TAR_EXTERN char f_confirm;		/* -w */
TAR_EXTERN char f_verify;		/* -W */
			/* CMD_EXTRACT     -x */
TAR_EXTERN char f_exclude;		/* -X */
TAR_EXTERN char	f_compress;		/* -z */
					/* -Z */

/*
 * We now default to Unix Standard format rather than 4.2BSD tar format.
 * The code can actually produce all three:
 *	f_standard	ANSI standard
 *	f_oldarch	V7
 *	neither		4.2BSD
 * but we don't bother, since 4.2BSD can read ANSI standard format anyway.
 * The only advantage to the "neither" option is that we can cmp our
 * output to the output of 4.2BSD tar, for debugging.
 */
#define		f_standard		(!f_oldarch)

/*
 * Structure for keeping track of filenames and lists thereof.
 */
struct name {
	struct name	*next;
	short		length;		/* cached strlen(name) */
	char		found;		/* A matching file has been found */
	char		firstch;	/* First char is literally matched */
	char		regexp;		/* This name is a regexp, not literal */
	char		*change_dir;	/* JF set with the -C option */
	char		*dir_contents;	/* JF for f_gnudump */
	char		name[NAMSIZ+1];
};

TAR_EXTERN struct name	*namelist;	/* Points to first name in list */
TAR_EXTERN struct name	*namelast;	/* Points to last name in list */

TAR_EXTERN int		archive;	/* File descriptor for archive file */
TAR_EXTERN int		errors;		/* # of files in error */

/*
 *
 * 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];
};

TAR_EXTERN struct link	*linklist;	/* Points to first link in list */


/*
 * Error recovery stuff
 */
TAR_EXTERN char		read_error_flag;


/*
 * Declarations of functions available to the world.
 */
union record *findrec();
void userec();
union record *endofrecs();
void anno();
#ifdef __STDC__
void msg(char *, ...);
void msg_perror(char *, ...);
#else
void msg();
void msg_perror();
#endif
/* #define	 annorec(stream, msg)	anno(stream, msg, 0)	/* Cur rec */
/* #define	annofile(stream, msg)	anno(stream, msg, 1)	/* Saved rec */
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