1 /* Get section at specific index. 2 Copyright (C) 1998, 1999, 2000, 2001, 2002, 2004 Red Hat, Inc. 3 Contributed by Ulrich Drepper <drepper (at) redhat.com>, 1998. 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 <stddef.h> 24 #include <stdlib.h> 25 26 #include "libelfP.h" 27 28 29 Elf_Scn * 30 elf_getscn (elf, idx) 31 Elf *elf; 32 size_t idx; 33 { 34 if (elf == NULL) 35 return NULL; 36 37 if (unlikely (elf->kind != ELF_K_ELF)) 38 { 39 __libelf_seterrno (ELF_E_INVALID_HANDLE); 40 return NULL; 41 } 42 43 rwlock_rdlock (elf->lock); 44 45 Elf_Scn *result = NULL; 46 47 /* Find the section in the list. */ 48 Elf_ScnList *runp = (elf->class == ELFCLASS32 49 || (offsetof (struct Elf, state.elf32.scns) 50 == offsetof (struct Elf, state.elf64.scns)) 51 ? &elf->state.elf32.scns : &elf->state.elf64.scns); 52 while (1) 53 { 54 if (idx < runp->max) 55 { 56 if (idx < runp->cnt) 57 result = &runp->data[idx]; 58 else 59 __libelf_seterrno (ELF_E_INVALID_INDEX); 60 break; 61 } 62 63 idx -= runp->max; 64 65 runp = runp->next; 66 if (runp == NULL) 67 { 68 __libelf_seterrno (ELF_E_INVALID_INDEX); 69 break; 70 } 71 } 72 73 rwlock_unlock (elf->lock); 74 75 return result; 76 } 77 INTDEF(elf_getscn) 78
