Line data    Source code

       1             : /* Retrieve file identification data.
       2             :    Copyright (C) 1998, 1999, 2000, 2002, 2004, 2015 Red Hat, Inc.
       3             :    This file is part of elfutils.
       4             :    Written 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 <stddef.h>
      35             : 
      36             : #include "libelfP.h"
      37             : 
      38             : 
      39             : char *
      40      182064 : elf_getident (Elf *elf, size_t *ptr)
      41             : {
      42             :   /* In case this is no ELF file, the handle is invalid and we return
      43             :      NULL.  */
      44      182064 :   if (elf == NULL || elf->kind != ELF_K_ELF)
      45             :     {
      46           0 :       if (ptr != NULL)
      47           0 :         *ptr = 0;
      48             :       return NULL;
      49             :     }
      50             : 
      51             :   /* We already read the ELF header.  Return a pointer to it and store
      52             :      the length in *PTR.  */
      53      182064 :   if (ptr != NULL)
      54          28 :     *ptr = EI_NIDENT;
      55             : 
      56      182064 :   return (char *) (elf->class == ELFCLASS32
      57             :                    || (offsetof (struct Elf, state.elf32.ehdr)
      58             :                        == offsetof (struct Elf, state.elf64.ehdr))
      59      182064 :                    ? elf->state.elf32.ehdr->e_ident
      60             :                    : elf->state.elf64.ehdr->e_ident);
      61             : }