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       1                 :             : /* Get symbol version information at the given index.
       2                 :             :    Copyright (C) 1999, 2000, 2001, 2002, 2005, 2009, 2014, 2015 Red Hat, Inc.
       3                 :             :    This file is part of elfutils.
       4                 :             :    Written by Ulrich Drepper <drepper@redhat.com>, 1999.
       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 <gelf.h>
      35                 :             : #include <string.h>
      36                 :             : 
      37                 :             : #include "libelfP.h"
      38                 :             : 
      39                 :             : 
      40                 :             : GElf_Versym *
      41                 :       17878 : gelf_getversym (Elf_Data *data, int ndx, GElf_Versym *dst)
      42                 :             : {
      43                 :       17878 :   Elf_Data_Scn *data_scn = (Elf_Data_Scn *) data;
      44                 :       17878 :   Elf_Scn *scn;
      45                 :       17878 :   GElf_Versym *result;
      46                 :             : 
      47         [ -  + ]:       17878 :   if (data == NULL)
      48                 :             :     return NULL;
      49                 :             : 
      50         [ -  + ]:       17878 :   if (unlikely (data->d_type != ELF_T_HALF))
      51                 :             :     {
      52                 :           0 :       __libelf_seterrno (ELF_E_INVALID_HANDLE);
      53                 :           0 :       return NULL;
      54                 :             :     }
      55                 :             : 
      56                 :             :   /* This is the one place where we have to take advantage of the fact
      57                 :             :      that an `Elf_Data' pointer is also a pointer to `Elf_Data_Scn'.
      58                 :             :      The interface is broken so that it requires this hack.  */
      59                 :       17878 :   scn = data_scn->s;
      60                 :             : 
      61                 :             :   /* It's easy to handle this type.  It has the same size for 32 and
      62                 :             :      64 bit objects.  */
      63                 :       17878 :   eu_static_assert (sizeof (GElf_Versym) == sizeof (Elf32_Versym));
      64                 :       17878 :   eu_static_assert (sizeof (GElf_Versym) == sizeof (Elf64_Versym));
      65                 :             : 
      66                 :       17878 :   rwlock_rdlock (scn->elf->lock);
      67                 :             : 
      68                 :             :   /* The data is already in the correct form.  Just make sure the
      69                 :             :      index is OK.  */
      70         [ -  + ]:       17878 :   if (INVALID_NDX (ndx, GElf_Versym, data))
      71                 :             :     {
      72                 :           0 :       __libelf_seterrno (ELF_E_INVALID_INDEX);
      73                 :           0 :       result = NULL;
      74                 :             :     }
      75                 :             :   else
      76                 :             :     {
      77                 :       17878 :       *dst = ((GElf_Versym *) data->d_buf)[ndx];
      78                 :             : 
      79                 :       17878 :       result = dst;
      80                 :             :     }
      81                 :             : 
      82                 :       17878 :   rwlock_unlock (scn->elf->lock);
      83                 :             : 
      84                 :       17878 :   return result;
      85                 :             : }