Line data    Source code

       1             : /* Returns the file name and build ID stored in the .gnu_altdebuglink if found.
       2             :    Copyright (C) 2014 Red Hat, Inc.
       3             :    This file is part of elfutils.
       4             : 
       5             :    This file is free software; you can redistribute it and/or modify
       6             :    it under the terms of either
       7             : 
       8             :      * the GNU Lesser General Public License as published by the Free
       9             :        Software Foundation; either version 3 of the License, or (at
      10             :        your option) any later version
      11             : 
      12             :    or
      13             : 
      14             :      * the GNU General Public License as published by the Free
      15             :        Software Foundation; either version 2 of the License, or (at
      16             :        your option) any later version
      17             : 
      18             :    or both in parallel, as here.
      19             : 
      20             :    elfutils is distributed in the hope that it will be useful, but
      21             :    WITHOUT ANY WARRANTY; without even the implied warranty of
      22             :    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      23             :    General Public License for more details.
      24             : 
      25             :    You should have received copies of the GNU General Public License and
      26             :    the GNU Lesser General Public License along with this program.  If
      27             :    not, see <http://www.gnu.org/licenses/>.  */
      28             : 
      29             : #ifdef HAVE_CONFIG_H
      30             : # include <config.h>
      31             : #endif
      32             : 
      33             : #include "libdwelfP.h"
      34             : 
      35             : ssize_t
      36        5347 : dwelf_dwarf_gnu_debugaltlink (Dwarf *dwarf,
      37             :                               const char **name_p,
      38             :                               const void **build_idp)
      39             : {
      40        5347 :   Elf_Data *data = dwarf->sectiondata[IDX_gnu_debugaltlink];
      41        5347 :   if (data == NULL)
      42             :     {
      43             :       return 0;
      44             :     }
      45             : 
      46          28 :   const void *ptr = memchr (data->d_buf, '\0', data->d_size);
      47          28 :   if (ptr == NULL)
      48             :     {
      49           0 :       __libdw_seterrno (DWARF_E_INVALID_ELF);
      50           0 :       return -1;
      51             :     }
      52          28 :   size_t build_id_len = data->d_size - (ptr - data->d_buf + 1);
      53          28 :   if (build_id_len == 0 || (size_t) (ssize_t) build_id_len != build_id_len)
      54             :     {
      55           0 :       __libdw_seterrno (DWARF_E_INVALID_ELF);
      56           0 :       return -1;
      57             :     }
      58          28 :   *name_p = data->d_buf;
      59          28 :   *build_idp = ptr + 1;
      60          28 :   return build_id_len;
      61             : }
      62             : INTDEF(dwelf_dwarf_gnu_debugaltlink)