lib/libdwarf/dwarf_cu.c

   1 /*-
   2  * Copyright (c) 2007 John Birrell (jb@freebsd.org)
   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  * $FreeBSD$
  27  */
  28
  29 #include "_libdwarf.h"
  30
  31 int
  32 dwarf_next_cu_header(Dwarf_Debug dbg, Dwarf_Unsigned *cu_header_length,
  33     Dwarf_Half *cu_version, Dwarf_Unsigned *cu_abbrev_offset,
  34     Dwarf_Half *cu_pointer_size, Dwarf_Unsigned *cu_next_offset, Dwarf_Error *error)
  35 {
  36         Dwarf_CU next;
  37
  38         if (error == NULL)
  39                 return DWARF_E_ERROR;
  40
  41         if (dbg == NULL || cu_header_length == NULL || cu_version == NULL ||
  42             cu_abbrev_offset == NULL || cu_pointer_size == NULL ||
  43             cu_next_offset == NULL) {
  44                 DWARF_SET_ERROR(error, DWARF_E_ARGUMENT);
  45                 return DWARF_E_ERROR;
  46         }
  47
  48         if (dbg->dbg_cu_current == NULL)
  49                 dbg->dbg_cu_current = STAILQ_FIRST(&dbg->dbg_cu);
  50         else if ((next = STAILQ_NEXT(dbg->dbg_cu_current, cu_next)) == NULL) {
  51                 DWARF_SET_ERROR(error, DWARF_E_NO_ENTRY);
  52                 return DWARF_E_NO_ENTRY;
  53         } else
  54                 dbg->dbg_cu_current = next;
  55
  56         if (dbg->dbg_cu_current == NULL) {
  57                 DWARF_SET_ERROR(error, DWARF_E_NO_ENTRY);
  58                 return DWARF_E_NO_ENTRY;
  59         }
  60
  61         *cu_header_length       = dbg->dbg_cu_current->cu_header_length;
  62         *cu_version             = dbg->dbg_cu_current->cu_version;
  63         *cu_abbrev_offset       = dbg->dbg_cu_current->cu_abbrev_offset;
  64         *cu_pointer_size        = dbg->dbg_cu_current->cu_pointer_size;
  65         *cu_next_offset         = dbg->dbg_cu_current->cu_next_offset;
  66
  67         return DWARF_E_NONE;
  68 }