Ulrich Drepper | b08d5a8 | 2005-07-26 05:00:05 +0000 | [diff] [blame] | 1 | /* Return string pointer from string section. |
| 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 <libelf.h> |
| 23 | #include <stddef.h> |
| 24 | |
| 25 | #include "libelfP.h" |
| 26 | |
| 27 | |
| 28 | char * |
| 29 | elf_strptr (elf, idx, offset) |
| 30 | Elf *elf; |
| 31 | size_t idx; |
| 32 | size_t offset; |
| 33 | { |
| 34 | if (elf == NULL) |
| 35 | return NULL; |
| 36 | |
| 37 | if (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 | char *result = NULL; |
| 46 | Elf_Scn *strscn; |
| 47 | |
| 48 | /* Find the section in the list. */ |
| 49 | Elf_ScnList *runp = (elf->class == ELFCLASS32 |
| 50 | || (offsetof (struct Elf, state.elf32.scns) |
| 51 | == offsetof (struct Elf, state.elf64.scns)) |
| 52 | ? &elf->state.elf32.scns : &elf->state.elf64.scns); |
| 53 | while (1) |
| 54 | { |
| 55 | if (idx < runp->max) |
| 56 | { |
| 57 | if (idx < runp->cnt) |
| 58 | strscn = &runp->data[idx]; |
| 59 | else |
| 60 | { |
| 61 | __libelf_seterrno (ELF_E_INVALID_INDEX); |
| 62 | goto out; |
| 63 | } |
| 64 | break; |
| 65 | } |
| 66 | |
| 67 | idx -= runp->max; |
| 68 | |
| 69 | runp = runp->next; |
| 70 | if (runp == NULL) |
| 71 | { |
| 72 | __libelf_seterrno (ELF_E_INVALID_INDEX); |
| 73 | goto out; |
| 74 | } |
| 75 | } |
| 76 | |
| 77 | if (elf->class == ELFCLASS32) |
| 78 | { |
| 79 | if (unlikely (strscn->shdr.e32->sh_type != SHT_STRTAB)) |
| 80 | { |
| 81 | /* This is no string section. */ |
| 82 | __libelf_seterrno (ELF_E_INVALID_SECTION); |
| 83 | goto out; |
| 84 | } |
| 85 | |
| 86 | if (unlikely (offset >= strscn->shdr.e32->sh_size)) |
| 87 | { |
| 88 | /* The given offset is too big, it is beyond this section. */ |
| 89 | __libelf_seterrno (ELF_E_OFFSET_RANGE); |
| 90 | goto out; |
| 91 | } |
| 92 | } |
| 93 | else |
| 94 | { |
| 95 | if (unlikely (strscn->shdr.e64->sh_type != SHT_STRTAB)) |
| 96 | { |
| 97 | /* This is no string section. */ |
| 98 | __libelf_seterrno (ELF_E_INVALID_SECTION); |
| 99 | goto out; |
| 100 | } |
| 101 | |
| 102 | if (unlikely (offset >= strscn->shdr.e64->sh_size)) |
| 103 | { |
| 104 | /* The given offset is too big, it is beyond this section. */ |
| 105 | __libelf_seterrno (ELF_E_OFFSET_RANGE); |
| 106 | goto out; |
| 107 | } |
| 108 | } |
| 109 | |
| 110 | if (strscn->rawdata_base == NULL |
| 111 | /* Read the section data. */ |
| 112 | && __libelf_set_rawdata (strscn) != 0) |
| 113 | goto out; |
| 114 | |
| 115 | result = &strscn->rawdata_base[offset]; |
| 116 | |
| 117 | out: |
| 118 | rwlock_unlock (elf->lock); |
| 119 | |
| 120 | return result; |
| 121 | } |
| 122 | INTDEF(elf_strptr) |