Line data    Source code

       1             : /* Get section at specific index.
       2             :    Copyright (C) 1998, 1999, 2000, 2001, 2002, 2004, 2015 Red Hat, Inc.
       3             :    This file is part of elfutils.
       4             :    Contributed by Ulrich Drepper <drepper@redhat.com>, 1998.
       5             : 
       6             :    This file is free software; you can redistribute it and/or modify
       7             :    it under the terms of either
       8             : 
       9             :      * the GNU Lesser General Public License as published by the Free
      10             :        Software Foundation; either version 3 of the License, or (at
      11             :        your option) any later version
      12             : 
      13             :    or
      14             : 
      15             :      * the GNU General Public License as published by the Free
      16             :        Software Foundation; either version 2 of the License, or (at
      17             :        your option) any later version
      18             : 
      19             :    or both in parallel, as here.
      20             : 
      21             :    elfutils is distributed in the hope that it will be useful, but
      22             :    WITHOUT ANY WARRANTY; without even the implied warranty of
      23             :    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      24             :    General Public License for more details.
      25             : 
      26             :    You should have received copies of the GNU General Public License and
      27             :    the GNU Lesser General Public License along with this program.  If
      28             :    not, see <http://www.gnu.org/licenses/>.  */
      29             : 
      30             : #ifdef HAVE_CONFIG_H
      31             : # include <config.h>
      32             : #endif
      33             : 
      34             : #include <assert.h>
      35             : #include <stddef.h>
      36             : #include <stdlib.h>
      37             : 
      38             : #include "libelfP.h"
      39             : 
      40             : 
      41             : Elf_Scn *
      42   644057756 : elf_getscn (Elf *elf, size_t idx)
      43             : {
      44   644057756 :   if (elf == NULL)
      45             :     return NULL;
      46             : 
      47   644057756 :   if (unlikely (elf->kind != ELF_K_ELF))
      48             :     {
      49           0 :       __libelf_seterrno (ELF_E_INVALID_HANDLE);
      50           0 :       return NULL;
      51             :     }
      52             : 
      53             :   rwlock_rdlock (elf->lock);
      54             : 
      55   644057756 :   Elf_Scn *result = NULL;
      56             : 
      57             :   /* Find the section in the list.  */
      58   644057756 :   Elf_ScnList *runp = (elf->class == ELFCLASS32
      59             :                        || (offsetof (struct Elf, state.elf32.scns)
      60             :                            == offsetof (struct Elf, state.elf64.scns))
      61             :                        ? &elf->state.elf32.scns : &elf->state.elf64.scns);
      62             :   while (1)
      63             :     {
      64   644059432 :       if (idx < runp->max)
      65             :         {
      66   644057702 :           if (idx < runp->cnt)
      67   644057702 :             result = &runp->data[idx];
      68             :           else
      69           0 :             __libelf_seterrno (ELF_E_INVALID_INDEX);
      70             :           break;
      71             :         }
      72             : 
      73        1730 :       idx -= runp->max;
      74             : 
      75        1730 :       runp = runp->next;
      76        1730 :       if (runp == NULL)
      77             :         {
      78          54 :           __libelf_seterrno (ELF_E_INVALID_INDEX);
      79          54 :           break;
      80             :         }
      81             :     }
      82             : 
      83             :   rwlock_unlock (elf->lock);
      84             : 
      85             :   return result;
      86             : }
      87             : INTDEF(elf_getscn)