Ulrich Drepper | b08d5a8 | 2005-07-26 05:00:05 +0000 | [diff] [blame^] | 1 | /* Get section at specific index. |
| 2 | Copyright (C) 1998, 1999, 2000, 2001, 2002, 2004 Red Hat, Inc. |
| 3 | Contributed by Ulrich Drepper <drepper@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) |