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 : 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 : assert (sizeof (GElf_Lib) == sizeof (Elf32_Lib));
60 : 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 : rwlock_unlock (data_scn->s->elf->lock);
75 :
76 0 : return result;
77 : }
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