ref: 7628681f83b663609eace87a50f8fbf68c31f40b
dir: /sys/src/ape/cmd/pax/tar.c/
/* $Source: /u/mark/src/pax/RCS/tar.c,v $
*
* $Revision: 1.2 $
*
* tar.c - tar specific functions for archive handling
*
* DESCRIPTION
*
* These routines provide a tar conforming interface to the pax
* program.
*
* AUTHOR
*
* Mark H. Colburn, NAPS International (mark@jhereg.mn.org)
*
* Sponsored by The USENIX Association for public distribution.
*
* Copyright (c) 1989 Mark H. Colburn.
* All rights reserved.
*
* Redistribution and use in source and binary forms are permitted
* provided that the above copyright notice is duplicated in all such
* forms and that any documentation, advertising materials, and other
* materials related to such distribution and use acknowledge that the
* software was developed by Mark H. Colburn and sponsored by The
* USENIX Association.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*
* $Log: tar.c,v $
* Revision 1.2 89/02/12 10:06:05 mark
* 1.2 release fixes
*
* Revision 1.1 88/12/23 18:02:38 mark
* Initial revision
*
*/
#ifndef lint
static char *ident = "$Id: tar.c,v 1.2 89/02/12 10:06:05 mark Exp $";
static char *copyright ="Copyright (c) 1989 Mark H. Colburn.\nAll rights reserved.";
#endif /* not lint */
/* Headers */
#include "pax.h"
/* Defines */
#define DEF_BLOCKING 20 /* default blocking factor for extract */
/* Function Prototypes */
#ifdef __STDC__
static int taropt(int , char **, char *);
static void usage(void);
#else /* !__STDC__ */
static int taropt();
static void usage();
#endif /* __STDC__ */
/* do_tar - main routine for tar.
*
* DESCRIPTION
*
* Provides a tar interface to the PAX program. All tar standard
* command line options are supported.
*
* PARAMETERS
*
* int argc - argument count (argc from main)
* char **argv - argument list (argv from main)
*
* RETURNS
*
* zero
*/
#ifdef __STDC__
int do_tar(int argc, char **argv)
#else
int do_tar(argc, argv)
int argc; /* argument count (argc from main) */
char **argv; /* argument list (argv from main) */
#endif
{
int c; /* Option letter */
/* Set default option values */
names_from_stdin = 0;
ar_file = getenv("TAPE"); /* From environment, or */
if (ar_file == 0) {
ar_file = DEF_AR_FILE; /* From Makefile */
}
/*
* set up the flags to reflect the default pax inteface. Unfortunately
* the pax interface has several options which are completely opposite
* of the tar and/or cpio interfaces...
*/
f_unconditional = 1;
f_mtime = 1;
f_dir_create = 1;
blocking = 0;
ar_interface = TAR;
ar_format = TAR;
msgfile=stderr;
/* Parse options */
while ((c = taropt(argc, argv, "b:cf:hlmortuvwx")) != EOF) {
switch (c) {
case 'b': /* specify blocking factor */
/*
* FIXME - we should use a conversion routine that does
* some kind of reasonable error checking, but...
*/
blocking = atoi(optarg);
break;
case 'c': /* create a new archive */
f_create = 1;
break;
case 'f': /* specify input/output file */
ar_file = optarg;
break;
case 'h':
f_follow_links = 1; /* follow symbolic links */
break;
case 'l': /* report unresolved links */
f_linksleft = 1;
break;
case 'm': /* don't restore modification times */
f_modified = 1;
break;
case 'o': /* take on user's group rather than
* archives */
break;
case 'r': /* named files are appended to archive */
f_append = 1;
break;
case 't':
f_list = 1; /* list files in archive */
break;
case 'u': /* named files are added to archive */
f_newer = 1;
break;
case 'v': /* verbose mode */
f_verbose = 1;
break;
case 'w': /* user interactive mode */
f_disposition = 1;
break;
case 'x': /* named files are extracted from archive */
f_extract = 1;
break;
case '?':
usage();
exit(EX_ARGSBAD);
}
}
/* check command line argument sanity */
if (f_create + f_extract + f_list + f_append + f_newer != 1) {
(void) fprintf(stderr,
"%s: you must specify exactly one of the c, t, r, u or x options\n",
myname);
usage();
exit(EX_ARGSBAD);
}
/* set the blocking factor, if not set by the user */
if (blocking == 0) {
#ifdef USG
if (f_extract || f_list) {
blocking = DEF_BLOCKING;
fprintf(stderr, "Tar: blocksize = %d\n", blocking);
} else {
blocking = 1;
}
#else /* !USG */
blocking = 20;
#endif /* USG */
}
blocksize = blocking * BLOCKSIZE;
buf_allocate((OFFSET) blocksize);
if (f_create) {
open_archive(AR_WRITE);
create_archive(); /* create the archive */
} else if (f_extract) {
open_archive(AR_READ);
read_archive(); /* extract files from archive */
} else if (f_list) {
open_archive(AR_READ);
read_archive(); /* read and list contents of archive */
} else if (f_append) {
open_archive(AR_APPEND);
append_archive(); /* append files to archive */
}
if (f_linksleft) {
linkleft(); /* report any unresolved links */
}
return (0);
}
/* taropt - tar specific getopt
*
* DESCRIPTION
*
* Plug-compatible replacement for getopt() for parsing tar-like
* arguments. If the first argument begins with "-", it uses getopt;
* otherwise, it uses the old rules used by tar, dump, and ps.
*
* PARAMETERS
*
* int argc - argument count (argc from main)
* char **argv - argument list (argv from main)
* char *optstring - sring which describes allowable options
*
* RETURNS
*
* Returns the next option character in the option string(s). If the
* option requires an argument and an argument was given, the argument
* is pointed to by "optarg". If no option character was found,
* returns an EOF.
*
*/
#ifdef __STDC__
static int taropt(int argc, char **argv, char *optstring)
#else
static int taropt(argc, argv, optstring)
int argc;
char **argv;
char *optstring;
#endif
{
extern char *optarg; /* Points to next arg */
extern int optind; /* Global argv index */
static char *key; /* Points to next keyletter */
static char use_getopt; /* !=0 if argv[1][0] was '-' */
char c;
char *place;
optarg = (char *)NULL;
if (key == (char *)NULL) { /* First time */
if (argc < 2)
return EOF;
key = argv[1];
if (*key == '-')
use_getopt++;
else
optind = 2;
}
if (use_getopt) {
return getopt(argc, argv, optstring);
}
c = *key++;
if (c == '\0') {
key--;
return EOF;
}
place = strchr(optstring, c);
if (place == (char *)NULL || c == ':') {
fprintf(stderr, "%s: unknown option %c\n", argv[0], c);
return ('?');
}
place++;
if (*place == ':') {
if (optind < argc) {
optarg = argv[optind];
optind++;
} else {
fprintf(stderr, "%s: %c argument missing\n",
argv[0], c);
return ('?');
}
}
return (c);
}
/* usage - print a helpful message and exit
*
* DESCRIPTION
*
* Usage prints out the usage message for the TAR interface and then
* exits with a non-zero termination status. This is used when a user
* has provided non-existant or incompatible command line arguments.
*
* RETURNS
*
* Returns an exit status of 1 to the parent process.
*
*/
#ifdef __STDC__
static void usage(void)
#else
static void usage()
#endif
{
fprintf(stderr, "Usage: %s -c[bfvw] device block filename..\n", myname);
fprintf(stderr, " %s -r[bvw] device block [filename...]\n", myname);
fprintf(stderr, " %s -t[vf] device\n", myname);
fprintf(stderr, " %s -u[bvw] device block [filename...]\n", myname);
fprintf(stderr, " %s -x[flmovw] device [filename...]\n", myname);
exit(1);
}