f0681de0c2
file specifications when they've been extracted (enabling you to get a file fast if it occurs somewhere close to the front). Submitted by: Marc van Kempen <wmbfmk@urc.tue.nl>
298 lines
9.2 KiB
C
298 lines
9.2 KiB
C
/* Declarations for tar archives.
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Copyright (C) 1988, 1992, 1993 Free Software Foundation
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This file is part of GNU Tar.
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GNU Tar is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Tar is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Tar; see the file COPYING. If not, write to
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the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
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/* major() and minor() macros (among other things) defined here for hpux */
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#ifdef hpux
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#include <sys/mknod.h>
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#endif
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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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#define SPARSE_EXT_HDR 21
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#define SPARSE_IN_HDR 4
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struct sparse
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{
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char offset[12];
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char numbytes[12];
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};
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struct sp_array
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{
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int offset;
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int numbytes;
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};
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union record
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{
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char charptr[RECORDSIZE];
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struct header
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{
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char arch_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 arch_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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/* these following fields were added by JF for gnu */
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/* and are NOT standard */
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char atime[12];
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char ctime[12];
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char offset[12];
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char longnames[4];
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#ifdef NEEDPAD
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char pad;
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#endif
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struct sparse sp[SPARSE_IN_HDR];
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char isextended;
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char realsize[12]; /* true size of the sparse file */
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/* char ending_blanks[12];*//* number of nulls at the
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end of the file, if any */
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}
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header;
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struct extended_header
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{
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struct sparse sp[21];
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char isextended;
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}
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ext_hdr;
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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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/* Note that the standards committee allows only capital A through
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capital Z for user-defined expansion. This means that defining something
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as, say '8' is a *bad* idea. */
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#define LF_DUMPDIR 'D' /* This is a dir entry that contains
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the names of files that were in
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the dir at the time the dump
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was made */
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#define LF_LONGLINK 'K' /* Identifies the NEXT file on the tape
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as having a long linkname */
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#define LF_LONGNAME 'L' /* Identifies the NEXT file on the tape
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as having a long name. */
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#define LF_MULTIVOL 'M' /* This is the continuation
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of a file that began on another
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volume */
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#define LF_NAMES 'N' /* For storing filenames that didn't
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fit in 100 characters */
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#define LF_SPARSE 'S' /* This is for sparse files */
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#define LF_VOLHDR 'V' /* This file is a tape/volume header */
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/* Ignore it on extraction */
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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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#define EX_BADVOL 5 /* Special error code means
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Tape volume doesn't match the one
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specified on the command line */
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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 *info_script; /* Script to run at end of each tape change */
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TAR_EXTERN char *name_file; /* File containing names to work on */
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TAR_EXTERN char filename_terminator; /* \n or \0. */
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TAR_EXTERN char *tar; /* Name of this program */
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TAR_EXTERN struct sp_array *sparsearray; /* Pointer to the start of the scratch space */
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TAR_EXTERN int sp_array_size; /* Initial size of the sparsearray */
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TAR_EXTERN int tot_written; /* Total written to output */
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TAR_EXTERN struct re_pattern_buffer
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*label_pattern; /* compiled regex for extract label */
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TAR_EXTERN char **ar_files; /* list of tape drive names */
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TAR_EXTERN int n_ar_files; /* number of tape drive names */
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TAR_EXTERN int cur_ar_file; /* tape drive currently being used */
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TAR_EXTERN int ar_files_len; /* malloced size of ar_files */
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TAR_EXTERN char *current_file_name, *current_link_name;
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/*
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* Flags from the command line
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*/
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TAR_EXTERN int cmd_mode;
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#define CMD_NONE 0
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#define CMD_CAT 1 /* -A */
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#define CMD_CREATE 2 /* -c */
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#define CMD_DIFF 3 /* -d */
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#define CMD_APPEND 4 /* -r */
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#define CMD_LIST 5 /* -t */
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#define CMD_UPDATE 6 /* -u */
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#define CMD_EXTRACT 7 /* -x */
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#define CMD_DELETE 8 /* -D */
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#define CMD_VERSION 9 /* --version */
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TAR_EXTERN int f_reblock; /* -B */
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#if 0
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TAR_EXTERN char f_dironly; /* -D */
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#endif
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TAR_EXTERN int f_run_script_at_end; /* -F */
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TAR_EXTERN int f_gnudump; /* -G */
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TAR_EXTERN int f_follow_links; /* -h */
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TAR_EXTERN int f_ignorez; /* -i */
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TAR_EXTERN int f_keep; /* -k */
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TAR_EXTERN int f_startfile; /* -K */
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TAR_EXTERN int f_local_filesys; /* -l */
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TAR_EXTERN int tape_length; /* -L */
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TAR_EXTERN int f_modified; /* -m */
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TAR_EXTERN int f_multivol; /* -M */
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TAR_EXTERN int f_new_files; /* -N */
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TAR_EXTERN int f_oldarch; /* -o */
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TAR_EXTERN int f_exstdout; /* -O */
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TAR_EXTERN int f_use_protection;/* -p */
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TAR_EXTERN int f_absolute_paths;/* -P */
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TAR_EXTERN int f_sayblock; /* -R */
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TAR_EXTERN int f_sorted_names; /* -s */
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TAR_EXTERN int f_sparse_files; /* -S ... JK */
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TAR_EXTERN int f_namefile; /* -T */
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TAR_EXTERN int f_verbose; /* -v */
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TAR_EXTERN char *f_volhdr; /* -V */
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TAR_EXTERN int f_confirm; /* -w */
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TAR_EXTERN int f_verify; /* -W */
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TAR_EXTERN int f_exclude; /* -X */
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TAR_EXTERN char *f_compressprog; /* -z and -Z */
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TAR_EXTERN int f_do_chown; /* --do-chown */
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TAR_EXTERN int f_totals; /* --totals */
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TAR_EXTERN int f_remove_files; /* --remove-files */
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TAR_EXTERN int f_ignore_failed_read; /* --ignore-failed-read */
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TAR_EXTERN int f_checkpoint; /* --checkpoint */
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TAR_EXTERN int f_show_omitted_dirs; /* --show-omitted-dirs */
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TAR_EXTERN char *f_volno_file; /* --volno-file */
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TAR_EXTERN int f_force_local; /* --force-local */
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TAR_EXTERN int f_atime_preserve;/* --atime-preserve */
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TAR_EXTERN int f_compress_block; /* --compress-block */
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TAR_EXTERN int f_unlink; /* --unlink */
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TAR_EXTERN int f_fast_read; /* --fast-read */
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/*
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* We 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 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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{
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struct name *next;
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short length; /* cached strlen(name) */
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char found; /* A matching file has been found */
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char firstch; /* First char is literally matched */
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char regexp; /* This name is a regexp, not literal */
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char *change_dir; /* JF set with the -C option */
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char *dir_contents; /* JF for f_gnudump */
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char fake; /* dummy entry */
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char name[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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TAR_EXTERN char *gnu_dumpfile;
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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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* global boolean, see name_match in tar.c
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*/
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extern int nlpsfreed;
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/*
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* Declarations of functions available to the world.
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*/
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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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#if defined (HAVE_VPRINTF) && __STDC__
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void msg (char *,...);
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void msg_perror (char *,...);
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#else
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void msg ();
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void msg_perror ();
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#endif
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