Ulrich Drepper | b08d5a8 | 2005-07-26 05:00:05 +0000 | [diff] [blame^] | 1 | /* Copyright (C) 1999, 2000, 2002 Red Hat, Inc. |
| 2 | Written by Ulrich Drepper <drepper@redhat.com>, 1999. |
| 3 | |
| 4 | This program is Open Source software; you can redistribute it and/or |
| 5 | modify it under the terms of the Open Software License version 1.0 as |
| 6 | published by the Open Source Initiative. |
| 7 | |
| 8 | You should have received a copy of the Open Software License along |
| 9 | with this program; if not, you may obtain a copy of the Open Software |
| 10 | License version 1.0 from http://www.opensource.org/licenses/osl.php or |
| 11 | by writing the Open Source Initiative c/o Lawrence Rosen, Esq., |
| 12 | 3001 King Ranch Road, Ukiah, CA 95482. */ |
| 13 | |
| 14 | #ifdef HAVE_CONFIG_H |
| 15 | # include <config.h> |
| 16 | #endif |
| 17 | |
| 18 | #include <fcntl.h> |
| 19 | #include <gelf.h> |
| 20 | #include <stdio.h> |
| 21 | #include <stdlib.h> |
| 22 | #include <string.h> |
| 23 | #include <unistd.h> |
| 24 | #include <sys/param.h> |
| 25 | |
| 26 | |
| 27 | int |
| 28 | main (int argc, char *argv[]) |
| 29 | { |
| 30 | int fd; |
| 31 | Elf *elf; |
| 32 | Elf *subelf; |
| 33 | Elf_Cmd cmd; |
| 34 | off_t offset; |
| 35 | size_t todo; |
| 36 | |
| 37 | if (argc < 4) |
| 38 | exit (1); |
| 39 | |
| 40 | /* Open the archive. */ |
| 41 | fd = open (argv[1], O_RDONLY); |
| 42 | if (fd == -1) |
| 43 | { |
| 44 | printf ("Cannot open input file: %m"); |
| 45 | exit (1); |
| 46 | } |
| 47 | |
| 48 | /* Set the ELF version. */ |
| 49 | elf_version (EV_CURRENT); |
| 50 | |
| 51 | /* Create an ELF descriptor. */ |
| 52 | cmd = ELF_C_READ; |
| 53 | elf = elf_begin (fd, cmd, NULL); |
| 54 | if (elf == NULL) |
| 55 | { |
| 56 | printf ("Cannot create ELF descriptor: %s\n", elf_errmsg (-1)); |
| 57 | exit (1); |
| 58 | } |
| 59 | |
| 60 | /* If it is no archive punt. */ |
| 61 | if (elf_kind (elf) != ELF_K_AR) |
| 62 | { |
| 63 | printf ("`%s' is no archive\n", argv[1]); |
| 64 | exit (1); |
| 65 | } |
| 66 | |
| 67 | /* Get the elements of the archive one after the other. */ |
| 68 | while ((subelf = elf_begin (fd, cmd, elf)) != NULL) |
| 69 | { |
| 70 | /* The the header for this element. */ |
| 71 | Elf_Arhdr *arhdr = elf_getarhdr (subelf); |
| 72 | |
| 73 | if (arhdr == NULL) |
| 74 | { |
| 75 | printf ("cannot get arhdr: %s\n", elf_errmsg (-1)); |
| 76 | exit (1); |
| 77 | } |
| 78 | |
| 79 | if (strcmp (arhdr->ar_name, argv[2]) == 0) |
| 80 | { |
| 81 | int outfd; |
| 82 | |
| 83 | /* Get the offset of the file in the archive. */ |
| 84 | offset = elf_getbase (subelf); |
| 85 | if (offset == -1) |
| 86 | { |
| 87 | printf ("\ |
| 88 | Failed to get base address for the archive element: %s\n", |
| 89 | elf_errmsg (-1)); |
| 90 | exit (1); |
| 91 | } |
| 92 | |
| 93 | /* Open the output file. */ |
| 94 | outfd = open (argv[3], O_CREAT | O_TRUNC | O_RDWR, 0666); |
| 95 | if (outfd == -1) |
| 96 | { |
| 97 | printf ("cannot open output file: %m"); |
| 98 | exit (1); |
| 99 | } |
| 100 | |
| 101 | /* Now write out the data. */ |
| 102 | todo = arhdr->ar_size; |
| 103 | while (todo > 0) |
| 104 | { |
| 105 | char buf[1024]; |
| 106 | ssize_t n = pread (fd, buf, MIN (sizeof buf, todo), offset); |
| 107 | if (n == 0) |
| 108 | break; |
| 109 | |
| 110 | if (write (outfd, buf, n) != n) |
| 111 | { |
| 112 | puts ("Writing output failed"); |
| 113 | exit (1); |
| 114 | } |
| 115 | |
| 116 | offset += n; |
| 117 | todo -= n; |
| 118 | } |
| 119 | |
| 120 | /* Check whether all the date was read and written out. */ |
| 121 | if (todo != 0) |
| 122 | { |
| 123 | puts ("Reading archive member failed."); |
| 124 | exit (1); |
| 125 | } |
| 126 | |
| 127 | /* Close the descriptors. */ |
| 128 | if (elf_end (subelf) != 0 || elf_end (elf) != 0) |
| 129 | { |
| 130 | printf ("Freeing ELF descriptors failed: %s", elf_errmsg (-1)); |
| 131 | exit (1); |
| 132 | } |
| 133 | |
| 134 | close (outfd); |
| 135 | close (fd); |
| 136 | |
| 137 | /* All went well. */ |
| 138 | exit (0); |
| 139 | } |
| 140 | |
| 141 | /* Get next archive element. */ |
| 142 | cmd = elf_next (subelf); |
| 143 | if (elf_end (subelf) != 0) |
| 144 | { |
| 145 | printf ("error while freeing sub-ELF descriptor: %s\n", |
| 146 | elf_errmsg (-1)); |
| 147 | exit (1); |
| 148 | } |
| 149 | } |
| 150 | |
| 151 | /* When we reach this point we haven't found the given file in the |
| 152 | archive. */ |
| 153 | printf ("File `%s' not found in archive\n", argv[2]); |
| 154 | exit (1); |
| 155 | } |