external/bsd/elftoolchain/dist/libelf/elf_getident.c

   1 /*      $NetBSD: elf_getident.c,v 1.2 2014/03/09 16:58:04 christos Exp $        */
   2
   3 /*-
   4  * Copyright (c) 2006,2008 Joseph Koshy
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  26  * SUCH DAMAGE.
  27  */
  28
  29 #if HAVE_NBTOOL_CONFIG_H
  30 # include "nbtool_config.h"
  31 #endif
  32
  33 #include <sys/cdefs.h>
  34
  35 #include <ar.h>
  36 #include <assert.h>
  37 #include <libelf.h>
  38
  39 #include "_libelf.h"
  40
  41 __RCSID("$NetBSD: elf_getident.c,v 1.2 2014/03/09 16:58:04 christos Exp $");
  42 ELFTC_VCSID("Id: elf_getident.c 2225 2011-11-26 18:55:54Z jkoshy ");
  43
  44 char *
  45 elf_getident(Elf *e, size_t *sz)
  46 {
  47
  48         if (e == NULL) {
  49                 LIBELF_SET_ERROR(ARGUMENT, 0);
  50                 goto error;
  51         }
  52
  53         if (e->e_cmd == ELF_C_WRITE && e->e_rawfile == NULL) {
  54                 LIBELF_SET_ERROR(SEQUENCE, 0);
  55                 goto error;
  56         }
  57
  58         assert(e->e_kind != ELF_K_AR || e->e_cmd == ELF_C_READ);
  59
  60         if (sz) {
  61                 if (e->e_kind == ELF_K_AR)
  62                         *sz = SARMAG;
  63                 else if (e->e_kind == ELF_K_ELF)
  64                         *sz = EI_NIDENT;
  65                 else
  66                         *sz = e->e_rawsize;
  67         }
  68
  69         return ((char *) e->e_rawfile);
  70
  71  error:
  72         if (sz)
  73                 *sz = 0;
  74         return (NULL);
  75 }