132 lines
3.3 KiB
C
132 lines
3.3 KiB
C
/* $NetBSD: dumptar.c,v 1.3 2016/05/30 17:34:35 dholland Exp $ */
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/*-
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* Copyright (c) 2004 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Christos Zoulas.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <err.h>
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#include <assert.h>
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#include <sys/stat.h>
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#include <sys/mman.h>
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#include "tar.h"
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#define ussum(a) 1
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/*
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* Ensure null termination.
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*/
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static char *
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buf(const char *p, size_t s)
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{
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static char buf[1024];
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assert(s < sizeof(buf));
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memcpy(buf, p, s);
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buf[s] = '\0';
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return buf;
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}
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static int
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intarg(const char *p, size_t s)
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{
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char *ep, *b = buf(p, s);
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int r = (int)strtol(b, &ep, 8);
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return r;
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}
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static int
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usdump(void *p)
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{
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HD_USTAR *t = p;
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int size = intarg(t->size, sizeof(t->size));
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size = ((size + 511) / 512) * 512 + 512;
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(void)fprintf(stdout, "*****\n");
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#define PR(a) \
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(void)fprintf(stdout, #a "=%s\n", buf(t->a, sizeof(t->a)));
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#define IPR(a) \
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(void)fprintf(stdout, #a "=%d\n", intarg(t->a, sizeof(t->a)));
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#define OPR(a) \
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(void)fprintf(stdout, #a "=%o\n", intarg(t->a, sizeof(t->a)));
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PR(name);
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OPR(mode);
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IPR(uid);
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IPR(gid);
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IPR(size);
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OPR(mtime);
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OPR(chksum);
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(void)fprintf(stdout, "typeflag=%c\n", t->typeflag);
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PR(linkname);
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PR(magic);
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PR(version);
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PR(uname);
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PR(gname);
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OPR(devmajor);
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OPR(devminor);
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PR(prefix);
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return size;
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}
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int
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main(int argc, char *argv[])
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{
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int fd;
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struct stat st;
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char *p, *ep;
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if (argc != 2) {
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(void)fprintf(stderr, "Usage: %s <filename>\n", getprogname());
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return 1;
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}
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if ((fd = open(argv[1], O_RDONLY)) == -1)
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err(1, "Cannot open `%s'", argv[1]);
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if (fstat(fd, &st) == -1)
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err(1, "Cannot fstat `%s'", argv[1]);
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if ((p = mmap(NULL, (size_t)st.st_size, PROT_READ,
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MAP_FILE|MAP_PRIVATE, fd, (off_t)0)) == MAP_FAILED)
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err(1, "Cannot mmap `%s'", argv[1]);
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(void)close(fd);
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ep = (char *)p + (size_t)st.st_size;
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for (; p < ep + sizeof(HD_USTAR);) {
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if (ussum(p))
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p += usdump(p);
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}
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return 0;
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}
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