usr/src/cmd/sgs/libelf/common/rand.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21
  22 /*
  23  * Copyright (c) 1990, 2010, Oracle and/or its affiliates. All rights reserved.
  24  */
  25
  26 /*      Copyright (c) 1988 AT&T */
  27 /*        All Rights Reserved   */
  28
  29 #include "libelf.h"
  30 #include "decl.h"
  31 #include "msg.h"
  32
  33 size_t
  34 elf_rand(Elf * elf, size_t off)
  35 {
  36         if (elf == 0)
  37                 return (0);
  38         ELFWLOCK(elf)
  39         if (elf->ed_kind != ELF_K_AR) {
  40                 _elf_seterr(EREQ_AR, 0);
  41                 ELFUNLOCK(elf)
  42                 return (0);
  43         }
  44         if ((off == 0) || (elf->ed_fsz < off)) {
  45                 _elf_seterr(EREQ_RAND, 0);
  46                 ELFUNLOCK(elf)
  47                 return (0);
  48         }
  49         elf->ed_nextoff = off;
  50         ELFUNLOCK(elf)
  51         return (off);
  52 }
  53
  54 /*
  55  * Private function used to obtain the current value of the next
  56  * offset field for an archive header. Returns 0 for error, and
  57  * the offset otherwise.
  58  */
  59 size_t
  60 _elf_getnextoff(Elf *elf)
  61 {
  62         size_t  off;
  63
  64         if (elf == NULL)
  65                 return (0);
  66         ELFWLOCK(elf)
  67         if (elf->ed_kind != ELF_K_AR) {
  68                 _elf_seterr(EREQ_AR, 0);
  69                 ELFUNLOCK(elf)
  70                 return (0);
  71         }
  72         off = elf->ed_nextoff;
  73         ELFUNLOCK(elf)
  74         return (off);
  75
  76 }