1/* vi: set sw=4 ts=4: */ 2/* 3 * Mini ar implementation for busybox 4 * 5 * Copyright (C) 2000 by Glenn McGrath 6 * Written by Glenn McGrath <bug1@optushome.com.au> 1 June 2000 7 * 8 * Based in part on BusyBox tar, Debian dpkg-deb and GNU ar. 9 * 10 * This program is free software; you can redistribute it and/or modify 11 * it under the terms of the GNU General Public License as published by 12 * the Free Software Foundation; either version 2 of the License, or 13 * (at your option) any later version. 14 * 15 * This program is distributed in the hope that it will be useful, 16 * but WITHOUT ANY WARRANTY; without even the implied warranty of 17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 18 * General Public License for more details. 19 * 20 * You should have received a copy of the GNU General Public License 21 * along with this program; if not, write to the Free Software 22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 23 * 24 */ 25#include <fcntl.h> 26#include <stdlib.h> 27#include <string.h> 28#include <getopt.h> 29#include <unistd.h> 30#include "busybox.h" 31 32extern int ar_main(int argc, char **argv) 33{ 34 FILE *src_stream = NULL; 35 char **extract_names = NULL; 36 char ar_magic[8]; 37 int extract_function = extract_unconditional; 38 int opt; 39 int num_of_entries = 0; 40 extern off_t archive_offset; 41 42 while ((opt = getopt(argc, argv, "ovtpx")) != -1) { 43 switch (opt) { 44 case 'o': 45 extract_function |= extract_preserve_date; 46 break; 47 case 'v': 48 extract_function |= extract_verbose_list; 49 break; 50 case 't': 51 extract_function |= extract_list; 52 break; 53 case 'p': 54 extract_function |= extract_to_stdout; 55 break; 56 case 'x': 57 extract_function |= extract_all_to_fs; 58 break; 59 default: 60 show_usage(); 61 } 62 } 63 64 /* check the src filename was specified */ 65 if (optind == argc) { 66 show_usage(); 67 } 68 69 src_stream = xfopen(argv[optind++], "r"); 70 71 /* check ar magic */ 72 fread(ar_magic, 1, 8, src_stream); 73 archive_offset = 8; 74 if (strncmp(ar_magic,"!<arch>",7) != 0) { 75 error_msg_and_die("invalid magic"); 76 } 77 78 /* Create a list of files to extract */ 79 while (optind < argc) { 80 extract_names = xrealloc(extract_names, sizeof(char *) * (num_of_entries + 2)); 81 extract_names[num_of_entries] = xstrdup(argv[optind]); 82 num_of_entries++; 83 extract_names[num_of_entries] = NULL; 84 optind++; 85 } 86 87 unarchive(src_stream, stdout, &get_header_ar, extract_function, "./", extract_names); 88 return EXIT_SUCCESS; 89} 90