Branch data Line data Source code
1 : : /* Get library from table at the given index.
2 : : Copyright (C) 2004, 2005, 2009, 2014, 2015 Red Hat, Inc.
3 : : This file is part of elfutils.
4 : : Written by Ulrich Drepper <drepper@redhat.com>, 2004.
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 <gelf.h>
36 : : #include <string.h>
37 : :
38 : : #include "libelfP.h"
39 : :
40 : :
41 : : GElf_Lib *
42 : 0 : gelf_getlib (Elf_Data *data, int ndx, GElf_Lib *dst)
43 : : {
44 [ # # ]: 0 : if (data == NULL)
45 : : return NULL;
46 : :
47 [ # # ]: 0 : if (unlikely (data->d_type != ELF_T_LIB))
48 : : {
49 : 0 : __libelf_seterrno (ELF_E_INVALID_HANDLE);
50 : 0 : return NULL;
51 : : }
52 : :
53 : 0 : Elf_Data_Scn *data_scn = (Elf_Data_Scn *) data;
54 : :
55 : 0 : rwlock_rdlock (data_scn->s->elf->lock);
56 : :
57 : : /* The on disk format of Elf32_Lib and Elf64_Lib is identical. So
58 : : we can simplify things significantly. */
59 : 0 : assert (sizeof (GElf_Lib) == sizeof (Elf32_Lib));
60 : 0 : assert (sizeof (GElf_Lib) == sizeof (Elf64_Lib));
61 : :
62 : : /* The data is already in the correct form. Just make sure the
63 : : index is OK. */
64 : 0 : GElf_Lib *result = NULL;
65 [ # # ]: 0 : if (INVALID_NDX (ndx, GElf_Lib, data))
66 : 0 : __libelf_seterrno (ELF_E_INVALID_INDEX);
67 : : else
68 : : {
69 : 0 : *dst = ((GElf_Lib *) data->d_buf)[ndx];
70 : :
71 : 0 : result = dst;
72 : : }
73 : :
74 : 0 : rwlock_unlock (data_scn->s->elf->lock);
75 : :
76 : 0 : return result;
77 : : }
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