lib/libelf/elf_getident.c

   1 /*-
   2  * Copyright (c) 2006,2008 Joseph Koshy
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  */
  26
  27 #include <sys/cdefs.h>
  28
  29 #include <ar.h>
  30 #include <assert.h>
  31 #include <libelf.h>
  32
  33 #include "_libelf.h"
  34
  35 LIBELF_VCSID("$Id$");
  36
  37 char *
  38 elf_getident(Elf *e, size_t *sz)
  39 {
  40
  41         if (e == NULL) {
  42                 LIBELF_SET_ERROR(ARGUMENT, 0);
  43                 goto error;
  44         }
  45
  46         if (e->e_cmd == ELF_C_WRITE && e->e_rawfile == NULL) {
  47                 LIBELF_SET_ERROR(SEQUENCE, 0);
  48                 goto error;
  49         }
  50
  51         assert(e->e_kind != ELF_K_AR || e->e_cmd == ELF_C_READ);
  52
  53         if (sz) {
  54                 if (e->e_kind == ELF_K_AR)
  55                         *sz = SARMAG;
  56                 else if (e->e_kind == ELF_K_ELF)
  57                         *sz = EI_NIDENT;
  58                 else
  59                         *sz = e->e_rawsize;
  60         }
  61
  62         return ((char *) e->e_rawfile);
  63
  64  error:
  65         if (sz)
  66                 *sz = 0;
  67         return (NULL);
  68 }