| /* Get section at specific index. |
| Copyright (C) 1998, 1999, 2000, 2001, 2002, 2004, 2015 Red Hat, Inc. |
| This file is part of elfutils. |
| Contributed by Ulrich Drepper <drepper@redhat.com>, 1998. |
| |
| This file is free software; you can redistribute it and/or modify |
| it under the terms of either |
| |
| * the GNU Lesser General Public License as published by the Free |
| Software Foundation; either version 3 of the License, or (at |
| your option) any later version |
| |
| or |
| |
| * the GNU General Public License as published by the Free |
| Software Foundation; either version 2 of the License, or (at |
| your option) any later version |
| |
| or both in parallel, as here. |
| |
| elfutils is distributed in the hope that it will be useful, but |
| WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| General Public License for more details. |
| |
| You should have received copies of the GNU General Public License and |
| the GNU Lesser General Public License along with this program. If |
| not, see <http://www.gnu.org/licenses/>. */ |
| |
| #ifdef HAVE_CONFIG_H |
| # include <config.h> |
| #endif |
| |
| #include <assert.h> |
| #include <stddef.h> |
| #include <stdlib.h> |
| |
| #include "libelfP.h" |
| |
| |
| Elf_Scn * |
| elf_getscn (Elf *elf, size_t idx) |
| { |
| if (elf == NULL) |
| return NULL; |
| |
| if (unlikely (elf->kind != ELF_K_ELF)) |
| { |
| __libelf_seterrno (ELF_E_INVALID_HANDLE); |
| return NULL; |
| } |
| |
| rwlock_rdlock (elf->lock); |
| |
| Elf_Scn *result = NULL; |
| |
| /* Find the section in the list. */ |
| Elf_ScnList *runp = (elf->class == ELFCLASS32 |
| || (offsetof (struct Elf, state.elf32.scns) |
| == offsetof (struct Elf, state.elf64.scns)) |
| ? &elf->state.elf32.scns : &elf->state.elf64.scns); |
| while (1) |
| { |
| if (idx < runp->max) |
| { |
| if (idx < runp->cnt) |
| result = &runp->data[idx]; |
| else |
| __libelf_seterrno (ELF_E_INVALID_INDEX); |
| break; |
| } |
| |
| idx -= runp->max; |
| |
| runp = runp->next; |
| if (runp == NULL) |
| { |
| __libelf_seterrno (ELF_E_INVALID_INDEX); |
| break; |
| } |
| } |
| |
| rwlock_unlock (elf->lock); |
| |
| return result; |
| } |
| INTDEF(elf_getscn) |