--- /dev/null
+/*
+ * 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.
+ */
+
+/*
+ * 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];
+ } 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. */
+
+/*
+ * 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 char f_reblock; /* -B */
+TAR_EXTERN char f_create; /* -c */
+TAR_EXTERN char f_debug; /* -d */
+TAR_EXTERN char f_sayblock; /* -D */
+TAR_EXTERN char f_follow_links; /* -h */
+TAR_EXTERN char f_ignorez; /* -i */
+TAR_EXTERN char f_keep; /* -k */
+TAR_EXTERN char f_modified; /* -m */
+TAR_EXTERN char f_oldarch; /* -o */
+TAR_EXTERN char f_use_protection; /* -p */
+TAR_EXTERN char f_sorted_names; /* -s */
+TAR_EXTERN char f_list; /* -t */
+TAR_EXTERN char f_namefile; /* -T */
+TAR_EXTERN char f_verbose; /* -v */
+TAR_EXTERN char f_extract; /* -x */
+TAR_EXTERN char f_compress; /* -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(1) 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;
+ char found;
+ 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();
+#define annorec(stream, msg) anno(stream, msg, 0) /* Cur rec */
+#define annofile(stream, msg) anno(stream, msg, 1) /* Saved rec */
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