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

   1 /*      $NetBSD: elf_next.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_next.c,v 1.2 2014/03/09 16:58:04 christos Exp $");
  42 ELFTC_VCSID("Id: elf_next.c 2225 2011-11-26 18:55:54Z jkoshy ");
  43
  44 Elf_Cmd
  45 elf_next(Elf *e)
  46 {
  47         off_t next;
  48         Elf *parent;
  49
  50         if (e == NULL)
  51                 return (ELF_C_NULL);
  52
  53          if ((parent = e->e_parent) == NULL) {
  54                  LIBELF_SET_ERROR(ARGUMENT, 0);
  55                  return (ELF_C_NULL);
  56          }
  57
  58         assert (parent->e_kind == ELF_K_AR);
  59         assert (parent->e_cmd == ELF_C_READ);
  60         assert(e->e_rawfile > parent->e_rawfile);
  61
  62         next = e->e_rawfile - parent->e_rawfile + e->e_rawsize;
  63         next = (next + 1) & ~1; /* round up to an even boundary */
  64
  65         parent->e_u.e_ar.e_next = (next >= (off_t) parent->e_rawsize) ?
  66             (off_t) 0 : next;
  67
  68         return (ELF_C_READ);
  69 }