external/bsd/libelf/dist/elf_getident.c

   1 /*      $NetBSD$        */
   2
   3 /*-
   4  * Copyright (c) 2006 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 #include <sys/cdefs.h>
  30 /* __FBSDID("$FreeBSD: src/lib/libelf/elf_getident.c,v 1.1.10.1.2.1 2009/10/25 01:10:29 kensmith Exp $"); */
  31
  32 #include <ar.h>
  33 #include <assert.h>
  34 #include <libelf.h>
  35
  36 #include "_libelf.h"
  37
  38 char *
  39 elf_getident(Elf *e, size_t *sz)
  40 {
  41
  42         if (e == NULL) {
  43                 LIBELF_SET_ERROR(ARGUMENT, 0);
  44                 goto error;
  45         }
  46
  47         if (e->e_cmd == ELF_C_WRITE && e->e_rawfile == NULL) {
  48                 LIBELF_SET_ERROR(SEQUENCE, 0);
  49                 goto error;
  50         }
  51
  52         assert(e->e_kind != ELF_K_AR || e->e_cmd == ELF_C_READ);
  53
  54         if (sz) {
  55                 if (e->e_kind == ELF_K_AR)
  56                         *sz = SARMAG;
  57                 else if (e->e_kind == ELF_K_ELF)
  58                         *sz = EI_NIDENT;
  59                 else
  60                         *sz = e->e_rawsize;
  61         }
  62
  63         return (e->e_rawfile);
  64
  65  error:
  66         if (sz)
  67                 *sz = 0;
  68         return (NULL);
  69 }