Branch data 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 : 14086 : elf_next (Elf *elf)
43 : : {
44 : 14086 : Elf *parent;
45 : 14086 : Elf_Cmd ret;
46 : :
47 : : /* Be gratious, the specs demand it. */
48 [ + - - + ]: 14086 : if (elf == NULL || elf->parent == NULL)
49 : : return ELF_C_NULL;
50 : :
51 : : /* We can be sure the parent is an archive. */
52 : 14086 : parent = elf->parent;
53 [ - + ]: 14086 : assert (parent->kind == ELF_K_AR);
54 : :
55 : 14086 : rwlock_wrlock (parent->lock);
56 : :
57 : : /* Now advance the offset. */
58 : 14086 : parent->state.ar.offset += (sizeof (struct ar_hdr)
59 : 14086 : + ((parent->state.ar.elf_ar_hdr.ar_size + 1)
60 : 14086 : & ~1l));
61 : :
62 : : /* Get the next archive header. */
63 [ + + ]: 14086 : ret = __libelf_next_arhdr_wrlock (parent) != 0 ? ELF_C_NULL : elf->cmd;
64 : :
65 : : /* If necessary, mark the archive header as unusable. */
66 [ - + ]: 14022 : if (ret == ELF_C_NULL)
67 : 64 : parent->state.ar.elf_ar_hdr.ar_name = NULL;
68 : :
69 : : rwlock_unlock (parent->lock);
70 : :
71 : : return ret;
72 : : }
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