Branch data Line data Source code
1 : : /* Select specific element in archive.
2 : : Copyright (C) 1998, 1999, 2000, 2002, 2015 Red Hat, Inc.
3 : : This file is part of elfutils.
4 : : Contributed by Ulrich Drepper <drepper@redhat.com>, 1998.
5 : :
6 : : This file is free software; you can redistribute it and/or modify
7 : : it under the terms of either
8 : :
9 : : * the GNU Lesser General Public License as published by the Free
10 : : Software Foundation; either version 3 of the License, or (at
11 : : your option) any later version
12 : :
13 : : or
14 : :
15 : : * the GNU General Public License as published by the Free
16 : : Software Foundation; either version 2 of the License, or (at
17 : : your option) any later version
18 : :
19 : : or both in parallel, as here.
20 : :
21 : : elfutils is distributed in the hope that it will be useful, but
22 : : WITHOUT ANY WARRANTY; without even the implied warranty of
23 : : MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
24 : : General Public License for more details.
25 : :
26 : : You should have received copies of the GNU General Public License and
27 : : the GNU Lesser General Public License along with this program. If
28 : : not, see <http://www.gnu.org/licenses/>. */
29 : :
30 : : #ifdef HAVE_CONFIG_H
31 : : # include <config.h>
32 : : #endif
33 : :
34 : : #include <libelf.h>
35 : : #include <stddef.h>
36 : :
37 : : #include "libelfP.h"
38 : :
39 : :
40 : : size_t
41 : 394 : elf_rand (Elf *elf, size_t offset)
42 : : {
43 : : /* Be gratious, the specs demand it. */
44 [ + - - + ]: 394 : if (elf == NULL || elf->kind != ELF_K_AR)
45 : : return 0;
46 : :
47 : 394 : rwlock_wrlock (elf->lock);
48 : :
49 : : /* Save the old offset and set the offset. */
50 : 394 : elf->state.ar.offset = elf->start_offset + offset;
51 : :
52 : : /* Get the next archive header. */
53 [ - + ]: 394 : if (__libelf_next_arhdr_wrlock (elf) != 0)
54 : : {
55 : : /* Mark the archive header as unusable. */
56 : 0 : elf->state.ar.elf_ar_hdr.ar_name = NULL;
57 : 0 : return 0;
58 : : }
59 : :
60 : : rwlock_unlock (elf->lock);
61 : :
62 : : return offset;
63 : : }
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