external/bsd/libdwarf/dist/dwarf_cu.c

   1 /*      $NetBSD$        */
   2
   3 /*-
   4  * Copyright (c) 2007 John Birrell (jb@freebsd.org)
   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  * $FreeBSD: src/lib/libdwarf/dwarf_cu.c,v 1.1.4.1 2009/08/03 08:13:06 kensmith Exp $
  29  */
  30
  31 #include "_libdwarf.h"
  32
  33 int
  34 dwarf_next_cu_header(Dwarf_Debug dbg, Dwarf_Unsigned *cu_header_length,
  35     Dwarf_Half *cu_version, Dwarf_Unsigned *cu_abbrev_offset,
  36     Dwarf_Half *cu_pointer_size, Dwarf_Unsigned *cu_next_offset, Dwarf_Error *error)
  37 {
  38         Dwarf_CU next;
  39
  40         if (error == NULL)
  41                 return DWARF_E_ERROR;
  42
  43         if (dbg == NULL || cu_header_length == NULL || cu_version == NULL ||
  44             cu_abbrev_offset == NULL || cu_pointer_size == NULL ||
  45             cu_next_offset == NULL) {
  46                 DWARF_SET_ERROR(error, DWARF_E_ARGUMENT);
  47                 return DWARF_E_ERROR;
  48         }
  49
  50         if (dbg->dbg_cu_current == NULL)
  51                 dbg->dbg_cu_current = STAILQ_FIRST(&dbg->dbg_cu);
  52         else if ((next = STAILQ_NEXT(dbg->dbg_cu_current, cu_next)) == NULL) {
  53                 DWARF_SET_ERROR(error, DWARF_E_NO_ENTRY);
  54                 return DWARF_E_NO_ENTRY;
  55         } else
  56                 dbg->dbg_cu_current = next;
  57
  58         if (dbg->dbg_cu_current == NULL) {
  59                 DWARF_SET_ERROR(error, DWARF_E_NO_ENTRY);
  60                 return DWARF_E_NO_ENTRY;
  61         }
  62
  63         *cu_header_length       = dbg->dbg_cu_current->cu_header_length;
  64         *cu_version             = dbg->dbg_cu_current->cu_version;
  65         *cu_abbrev_offset       = dbg->dbg_cu_current->cu_abbrev_offset;
  66         *cu_pointer_size        = dbg->dbg_cu_current->cu_pointer_size;
  67         *cu_next_offset         = dbg->dbg_cu_current->cu_next_offset;
  68
  69         return DWARF_E_NONE;
  70 }