1 /* $NetBSD: dumptar.c,v 1.2 2008/04/28 20:22:51 martin Exp $ */ 2 3 /*- 4 * Copyright (c) 2004 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Christos Zoulas. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #include <stdio.h> 33 #include <err.h> 34 #include <fcntl.h> 35 #include <sys/stat.h> 36 #include <sys/mman.h> 37 38 #include "tar.h" 39 40 #define ussum(a) 1 41 42 static char * 43 buf(const char *p, size_t s) 44 { 45 static char buf[1024]; 46 (void)snprintf(buf, sizeof(buf), "%s", p); 47 buf[s] = '\0'; 48 return buf; 49 } 50 51 int 52 intarg(const char *p, size_t s) 53 { 54 char *ep, *b = buf(p, s); 55 int r = (int)strtol(p, &ep, 8); 56 return r; 57 } 58 59 static int 60 usdump(void *p) 61 { 62 HD_USTAR *t = p; 63 int size = intarg(t->size, sizeof(t->size)); 64 size = ((size + 511) / 512) * 512 + 512; 65 66 (void)fprintf(stdout, "*****\n"); 67 #define PR(a) \ 68 (void)fprintf(stdout, #a "=%s\n", buf(t->a, sizeof(t->a))); 69 #define IPR(a) \ 70 (void)fprintf(stdout, #a "=%d\n", intarg(t->a, sizeof(t->a))); 71 #define OPR(a) \ 72 (void)fprintf(stdout, #a "=%o\n", intarg(t->a, sizeof(t->a))); 73 PR(name); 74 OPR(mode); 75 IPR(uid); 76 IPR(gid); 77 IPR(size); 78 OPR(mtime); 79 OPR(chksum); 80 (void)fprintf(stdout, "typeflag=%c\n", t->typeflag); 81 PR(linkname); 82 PR(magic); 83 PR(version); 84 PR(uname); 85 PR(gname); 86 OPR(devmajor); 87 OPR(devminor); 88 PR(prefix); 89 return size; 90 } 91 92 int 93 main(int argc, char *argv[]) 94 { 95 int fd; 96 struct stat st; 97 char *p, *ep; 98 99 if (argc != 2) { 100 (void)fprintf(stderr, "Usage: %s <filename>\n", getprogname()); 101 return 1; 102 } 103 104 if ((fd = open(argv[1], O_RDONLY)) == -1) 105 err(1, "Cannot open `%s'", argv[1]); 106 107 if (fstat(fd, &st) == -1) 108 err(1, "Cannot fstat `%s'", argv[1]); 109 110 if ((p = mmap(NULL, (size_t)st.st_size, PROT_READ, 111 MAP_FILE|MAP_PRIVATE, fd, (off_t)0)) == MAP_FAILED) 112 err(1, "Cannot mmap `%s'", argv[1]); 113 (void)close(fd); 114 115 ep = (char *)p + (size_t)st.st_size; 116 117 for (; p < ep + sizeof(HD_USTAR);) { 118 if (ussum(p)) 119 p += usdump(p); 120 } 121 return 0; 122 } 123