ext/libelf/elf_getident.c

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