178 lines
5.1 KiB
C
178 lines
5.1 KiB
C
/*
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* Header file for public domain tar (tape archive) program.
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*
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* @(#)tar.h 1.20 86/10/29 Public Domain.
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*
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* Created 25 August 1985 by John Gilmore, ihnp4!hoptoad!gnu.
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*/
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/*
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* Kludge for handling systems that can't cope with multiple
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* external definitions of a variable. In ONE routine (tar.c),
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* we #define TAR_EXTERN to null; here, we set it to "extern" if
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* it is not already set.
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*/
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#ifndef TAR_EXTERN
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#define TAR_EXTERN extern
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#endif
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/*
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* Header block on tape.
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*
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* I'm going to use traditional DP naming conventions here.
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* A "block" is a big chunk of stuff that we do I/O on.
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* A "record" is a piece of info that we care about.
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* Typically many "record"s fit into a "block".
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*/
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#define RECORDSIZE 512
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#define NAMSIZ 100
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#define TUNMLEN 32
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#define TGNMLEN 32
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union record {
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char charptr[RECORDSIZE];
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struct header {
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char name[NAMSIZ];
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char mode[8];
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char uid[8];
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char gid[8];
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char size[12];
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char mtime[12];
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char chksum[8];
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char linkflag;
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char linkname[NAMSIZ];
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char magic[8];
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char uname[TUNMLEN];
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char gname[TGNMLEN];
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char devmajor[8];
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char devminor[8];
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} header;
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};
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/* The checksum field is filled with this while the checksum is computed. */
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#define CHKBLANKS " " /* 8 blanks, no null */
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/* The magic field is filled with this if uname and gname are valid. */
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#define TMAGIC "ustar " /* 7 chars and a null */
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/* The linkflag defines the type of file */
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#define LF_OLDNORMAL '\0' /* Normal disk file, Unix compat */
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#define LF_NORMAL '0' /* Normal disk file */
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#define LF_LINK '1' /* Link to previously dumped file */
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#define LF_SYMLINK '2' /* Symbolic link */
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#define LF_CHR '3' /* Character special file */
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#define LF_BLK '4' /* Block special file */
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#define LF_DIR '5' /* Directory */
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#define LF_FIFO '6' /* FIFO special file */
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#define LF_CONTIG '7' /* Contiguous file */
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/* Further link types may be defined later. */
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/*
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* Exit codes from the "tar" program
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*/
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#define EX_SUCCESS 0 /* success! */
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#define EX_ARGSBAD 1 /* invalid args */
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#define EX_BADFILE 2 /* invalid filename */
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#define EX_BADARCH 3 /* bad archive */
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#define EX_SYSTEM 4 /* system gave unexpected error */
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/*
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* Global variables
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*/
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TAR_EXTERN union record *ar_block; /* Start of block of archive */
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TAR_EXTERN union record *ar_record; /* Current record of archive */
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TAR_EXTERN union record *ar_last; /* Last+1 record of archive block */
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TAR_EXTERN char ar_reading; /* 0 writing, !0 reading archive */
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TAR_EXTERN int blocking; /* Size of each block, in records */
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TAR_EXTERN int blocksize; /* Size of each block, in bytes */
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TAR_EXTERN char *ar_file; /* File containing archive */
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TAR_EXTERN char *name_file; /* File containing names to work on */
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TAR_EXTERN char *tar; /* Name of this program */
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/*
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* Flags from the command line
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*/
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TAR_EXTERN char f_reblock; /* -B */
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TAR_EXTERN char f_create; /* -c */
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TAR_EXTERN char f_debug; /* -d */
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TAR_EXTERN char f_sayblock; /* -D */
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TAR_EXTERN char f_follow_links; /* -h */
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TAR_EXTERN char f_ignorez; /* -i */
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TAR_EXTERN char f_keep; /* -k */
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TAR_EXTERN char f_modified; /* -m */
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TAR_EXTERN char f_oldarch; /* -o */
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TAR_EXTERN char f_use_protection; /* -p */
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TAR_EXTERN char f_sorted_names; /* -s */
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TAR_EXTERN char f_list; /* -t */
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TAR_EXTERN char f_namefile; /* -T */
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TAR_EXTERN char f_verbose; /* -v */
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TAR_EXTERN char f_extract; /* -x */
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TAR_EXTERN char f_compress; /* -z */
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/*
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* We now default to Unix Standard format rather than 4.2BSD tar format.
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* The code can actually produce all three:
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* f_standard ANSI standard
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* f_oldarch V7
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* neither 4.2BSD
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* but we don't bother, since 4.2BSD can read ANSI standard format anyway.
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* The only advantage to the "neither" option is that we can cmp(1) our
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* output to the output of 4.2BSD tar, for debugging.
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*/
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#define f_standard (!f_oldarch)
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/*
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* Structure for keeping track of filenames and lists thereof.
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*/
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struct name {
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struct name *next;
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short length;
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char found;
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char name[NAMSIZ+1];
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};
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TAR_EXTERN struct name *namelist; /* Points to first name in list */
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TAR_EXTERN struct name *namelast; /* Points to last name in list */
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TAR_EXTERN int archive; /* File descriptor for archive file */
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TAR_EXTERN int errors; /* # of files in error */
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/*
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*
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* Due to the next struct declaration, each routine that includes
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* "tar.h" must also include <sys/types.h>. I tried to make it automatic,
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* but System V has no defines in <sys/types.h>, so there is no way of
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* knowing when it has been included. In addition, it cannot be included
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* twice, but must be included exactly once. Argghh!
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*
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* Thanks, typedef. Thanks, USG.
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*/
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struct link {
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struct link *next;
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dev_t dev;
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ino_t ino;
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short linkcount;
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char name[NAMSIZ+1];
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};
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TAR_EXTERN struct link *linklist; /* Points to first link in list */
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/*
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* Error recovery stuff
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*/
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TAR_EXTERN char read_error_flag;
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/*
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* Declarations of functions available to the world.
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*/
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/*LINTLIBRARY*/
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union record *findrec();
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void userec();
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union record *endofrecs();
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void anno();
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#define annorec(stream, msg) anno(stream, msg, 0) /* Cur rec */
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#define annofile(stream, msg) anno(stream, msg, 1) /* Saved rec */
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