1 /* Get symbol version information at the given index. 2 Copyright (C) 1999, 2000, 2001, 2002 Red Hat, Inc. 3 Written by Ulrich Drepper <drepper (at) redhat.com>, 1999. 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_Versym * 30 gelf_getversym (data, ndx, dst) 31 Elf_Data *data; 32 int ndx; 33 GElf_Versym *dst; 34 { 35 Elf_Data_Scn *data_scn = (Elf_Data_Scn *) data; 36 Elf_Scn *scn; 37 GElf_Versym *result; 38 39 if (data == NULL) 40 return NULL; 41 42 if (unlikely (data->d_type != ELF_T_HALF)) 43 { 44 __libelf_seterrno (ELF_E_INVALID_HANDLE); 45 return NULL; 46 } 47 48 /* This is the one place where we have to take advantage of the fact 49 that an `Elf_Data' pointer is also a pointer to `Elf_Data_Scn'. 50 The interface is broken so that it requires this hack. */ 51 scn = data_scn->s; 52 53 /* It's easy to handle this type. It has the same size for 32 and 54 64 bit objects. */ 55 assert (sizeof (GElf_Versym) == sizeof (Elf32_Versym)); 56 assert (sizeof (GElf_Versym) == sizeof (Elf64_Versym)); 57 58 rwlock_rdlock (scn->elf->lock); 59 60 /* The data is already in the correct form. Just make sure the 61 index is OK. */ 62 if (unlikely ((ndx + 1) * sizeof (GElf_Versym) > data->d_size)) 63 { 64 __libelf_seterrno (ELF_E_INVALID_INDEX); 65 result = NULL; 66 } 67 else 68 { 69 *dst = ((GElf_Versym *) data->d_buf)[ndx]; 70 71 result = dst; 72 } 73 74 rwlock_unlock (scn->elf->lock); 75 76 return result; 77 } 78
