Ulrich Drepper | b08d5a8 | 2005-07-26 05:00:05 +0000 | [diff] [blame] | 1 | /* Get library from table at the given index. |
| 2 | Copyright (C) 2004 Red Hat, Inc. |
Mark Wielaard | de2ed97 | 2012-06-05 17:15:16 +0200 | [diff] [blame] | 3 | This file is part of elfutils. |
Ulrich Drepper | b08d5a8 | 2005-07-26 05:00:05 +0000 | [diff] [blame] | 4 | Written by Ulrich Drepper <drepper@redhat.com>, 2004. |
| 5 | |
Mark Wielaard | de2ed97 | 2012-06-05 17:15:16 +0200 | [diff] [blame] | 6 | This file is free software; you can redistribute it and/or modify |
| 7 | it under the terms of either |
Ulrich Drepper | b08d5a8 | 2005-07-26 05:00:05 +0000 | [diff] [blame] | 8 | |
Mark Wielaard | de2ed97 | 2012-06-05 17:15:16 +0200 | [diff] [blame] | 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 |
Ulrich Drepper | 361df7d | 2006-04-04 21:38:57 +0000 | [diff] [blame] | 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. |
Ulrich Drepper | b08d5a8 | 2005-07-26 05:00:05 +0000 | [diff] [blame] | 25 | |
Mark Wielaard | de2ed97 | 2012-06-05 17:15:16 +0200 | [diff] [blame] | 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/>. */ |
Ulrich Drepper | b08d5a8 | 2005-07-26 05:00:05 +0000 | [diff] [blame] | 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 | gelf_getlib (data, ndx, dst) |
| 43 | Elf_Data *data; |
| 44 | int ndx; |
| 45 | GElf_Lib *dst; |
| 46 | { |
| 47 | if (data == NULL) |
| 48 | return NULL; |
| 49 | |
| 50 | if (unlikely (data->d_type != ELF_T_LIB)) |
| 51 | { |
| 52 | __libelf_seterrno (ELF_E_INVALID_HANDLE); |
| 53 | return NULL; |
| 54 | } |
| 55 | |
| 56 | Elf_Data_Scn *data_scn = (Elf_Data_Scn *) data; |
| 57 | |
Roland McGrath | b4d6f0f | 2008-08-25 22:55:17 +0000 | [diff] [blame] | 58 | rwlock_rdlock (data_scn->s->elf->lock); |
Ulrich Drepper | b08d5a8 | 2005-07-26 05:00:05 +0000 | [diff] [blame] | 59 | |
| 60 | /* The on disk format of Elf32_Lib and Elf64_Lib is identical. So |
| 61 | we can simplify things significantly. */ |
| 62 | assert (sizeof (GElf_Lib) == sizeof (Elf32_Lib)); |
| 63 | assert (sizeof (GElf_Lib) == sizeof (Elf64_Lib)); |
| 64 | |
| 65 | /* The data is already in the correct form. Just make sure the |
| 66 | index is OK. */ |
| 67 | GElf_Lib *result = NULL; |
| 68 | if (unlikely ((ndx + 1) * sizeof (GElf_Lib) > data->d_size)) |
| 69 | __libelf_seterrno (ELF_E_INVALID_INDEX); |
| 70 | else |
| 71 | { |
| 72 | *dst = ((GElf_Lib *) data->d_buf)[ndx]; |
| 73 | |
| 74 | result = dst; |
| 75 | } |
| 76 | |
Roland McGrath | b4d6f0f | 2008-08-25 22:55:17 +0000 | [diff] [blame] | 77 | rwlock_unlock (data_scn->s->elf->lock); |
Ulrich Drepper | b08d5a8 | 2005-07-26 05:00:05 +0000 | [diff] [blame] | 78 | |
| 79 | return result; |
| 80 | } |