1 /* Get library from table at the given index. 2 Copyright (C) 2004 Red Hat, Inc. 3 Written by Ulrich Drepper <drepper (at) redhat.com>, 2004. 4 5 This program is free software; you can redistribute it and/or modify 6 it under the terms of the GNU General Public License as published by 7 the Free Software Foundation, version 2. 8 9 This program is distributed in the hope that it will be useful, 10 but WITHOUT ANY WARRANTY; without even the implied warranty of 11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 GNU General Public License for more details. 13 14 You should have received a copy of the GNU General Public License 15 along with this program; if not, write to the Free Software Foundation, 16 Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ 17 18 #ifdef HAVE_CONFIG_H 19 # include <config.h> 20 #endif 21 22 #include <assert.h> 23 #include <gelf.h> 24 #include <string.h> 25 26 #include "libelfP.h" 27 28 29 GElf_Lib * 30 gelf_getlib (data, ndx, dst) 31 Elf_Data *data; 32 int ndx; 33 GElf_Lib *dst; 34 { 35 if (data == NULL) 36 return NULL; 37 38 if (unlikely (data->d_type != ELF_T_LIB)) 39 { 40 __libelf_seterrno (ELF_E_INVALID_HANDLE); 41 return NULL; 42 } 43 44 Elf_Data_Scn *data_scn = (Elf_Data_Scn *) data; 45 46 rwlock_rdlock (data_scn->s->elf->lock); 47 48 /* The on disk format of Elf32_Lib and Elf64_Lib is identical. So 49 we can simplify things significantly. */ 50 assert (sizeof (GElf_Lib) == sizeof (Elf32_Lib)); 51 assert (sizeof (GElf_Lib) == sizeof (Elf64_Lib)); 52 53 /* The data is already in the correct form. Just make sure the 54 index is OK. */ 55 GElf_Lib *result = NULL; 56 if (unlikely ((ndx + 1) * sizeof (GElf_Lib) > data->d_size)) 57 __libelf_seterrno (ELF_E_INVALID_INDEX); 58 else 59 { 60 *dst = ((GElf_Lib *) data->d_buf)[ndx]; 61 62 result = dst; 63 } 64 65 rwlock_unlock (data_scn->s->elf->lock); 66 67 return result; 68 } 69
