external/bsd/libdwarf/dist/dwarf_attr.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_attr.c,v 1.1.4.1 2009/08/03 08:13:06 kensmith Exp $
  29  */
  30
  31 #include <stdlib.h>
  32 #include <string.h>
  33 #include "_libdwarf.h"
  34
  35 int
  36 dwarf_attr(Dwarf_Die die, Dwarf_Half attr, Dwarf_Attribute *atp, Dwarf_Error *err)
  37 {
  38         Dwarf_Attribute at;
  39         Dwarf_Abbrev    a;
  40         int ret = DWARF_E_NONE;
  41
  42         if (err == NULL)
  43                 return DWARF_E_ERROR;
  44
  45         if (die == NULL || atp == NULL || (a = die->die_a) == NULL) {
  46                 DWARF_SET_ERROR(err, DWARF_E_ARGUMENT);
  47                 return DWARF_E_ARGUMENT;
  48         }
  49
  50         STAILQ_FOREACH(at, &a->a_attrib, at_next)
  51                 if (at->at_attrib == attr)
  52                         break;
  53
  54         *atp = at;
  55
  56         if (at == NULL) {
  57                 DWARF_SET_ERROR(err, DWARF_E_NO_ENTRY);
  58                 ret = DWARF_E_NO_ENTRY;
  59         }
  60
  61         return ret;
  62 }
  63
  64 int
  65 dwarf_attr_add(Dwarf_Abbrev a, uint64_t attr, uint64_t form, Dwarf_Attribute *atp, Dwarf_Error *error)
  66 {
  67         Dwarf_Attribute at;
  68         int ret = DWARF_E_NONE;
  69
  70         if (error == NULL)
  71                 return DWARF_E_ERROR;
  72
  73         if (a == NULL) {
  74                 DWARF_SET_ERROR(error, DWARF_E_ARGUMENT);
  75                 return DWARF_E_ARGUMENT;
  76         }
  77
  78         if ((at = malloc(sizeof(struct _Dwarf_Attribute))) == NULL) {
  79                 DWARF_SET_ERROR(error, DWARF_E_MEMORY);
  80                 return DWARF_E_MEMORY;
  81         }
  82
  83         /* Initialise the attribute structure. */
  84         at->at_attrib   = attr;
  85         at->at_form     = form;
  86
  87         /* Add the attribute to the list in the abbrev. */
  88         STAILQ_INSERT_TAIL(&a->a_attrib, at, at_next);
  89
  90         if (atp != NULL)
  91                 *atp = at;
  92
  93         return ret;
  94 }