Line data Source code
1 : /* Advance in archive to next element.
2 : Copyright (C) 1998-2009, 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 <assert.h>
35 : #include <libelf.h>
36 : #include <stddef.h>
37 :
38 : #include "libelfP.h"
39 :
40 :
41 : Elf_Cmd
42 6919 : elf_next (Elf *elf)
43 : {
44 : Elf *parent;
45 : Elf_Cmd ret;
46 :
47 : /* Be gratious, the specs demand it. */
48 6919 : if (elf == NULL || elf->parent == NULL)
49 : return ELF_C_NULL;
50 :
51 : /* We can be sure the parent is an archive. */
52 6919 : parent = elf->parent;
53 6919 : assert (parent->kind == ELF_K_AR);
54 :
55 : rwlock_wrlock (parent->lock);
56 :
57 : /* Now advance the offset. */
58 13838 : parent->state.ar.offset += (sizeof (struct ar_hdr)
59 6919 : + ((parent->state.ar.elf_ar_hdr.ar_size + 1)
60 6919 : & ~1l));
61 :
62 : /* Get the next archive header. */
63 6919 : ret = __libelf_next_arhdr_wrlock (parent) != 0 ? ELF_C_NULL : elf->cmd;
64 :
65 : /* If necessary, mark the archive header as unusable. */
66 6919 : if (ret == ELF_C_NULL)
67 5 : parent->state.ar.elf_ar_hdr.ar_name = NULL;
68 :
69 : rwlock_unlock (parent->lock);
70 :
71 : return ret;
72 : }
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