/*-
 * Copyright (c) 2009,2011 Kai Wang
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include "_libdwarf.h"

ELFTC_VCSID("$Id: dwarf_abbrev.c 2072 2011-10-27 03:26:49Z jkoshy $");

int
dwarf_get_abbrev(Dwarf_Debug dbg, Dwarf_Unsigned offset,
    Dwarf_Abbrev *return_abbrev, Dwarf_Unsigned *length,
    Dwarf_Unsigned *attr_count, Dwarf_Error *error)
{
	Dwarf_Abbrev ab;
	int ret;

	if (dbg == NULL || return_abbrev == NULL || length == NULL ||
	    attr_count == NULL) {
		DWARF_SET_ERROR(dbg, error, DW_DLE_ARGUMENT);
		return (DW_DLV_ERROR);
	}

	ret = _dwarf_abbrev_parse(dbg, NULL, &offset, &ab, error);
	if (ret != DW_DLE_NONE) {
		if (ret == DW_DLE_NO_ENTRY) {
			DWARF_SET_ERROR(dbg, error, DW_DLE_NO_ENTRY);
			return (DW_DLV_NO_ENTRY);
		} else
			return (DW_DLV_ERROR);
	}

	*return_abbrev = ab;
	*length = ab->ab_length;
	*attr_count = ab->ab_atnum;

	return (DW_DLV_OK);
}

int
dwarf_get_abbrev_tag(Dwarf_Abbrev abbrev, Dwarf_Half *return_tag,
    Dwarf_Error *error)
{

	if (abbrev == NULL || return_tag == NULL) {
		DWARF_SET_ERROR(NULL, error, DW_DLE_ARGUMENT);
		return (DW_DLV_ERROR);
	}

	*return_tag = (Dwarf_Half) abbrev->ab_tag;

	return (DW_DLV_OK);
}

int
dwarf_get_abbrev_code(Dwarf_Abbrev abbrev, Dwarf_Unsigned *return_code,
    Dwarf_Error *error)
{

	if (abbrev == NULL || return_code == NULL) {
		DWARF_SET_ERROR(NULL, error, DW_DLE_ARGUMENT);
		return (DW_DLV_ERROR);
	}

	*return_code = abbrev->ab_entry;

	return (DW_DLV_OK);
}

int
dwarf_get_abbrev_children_flag(Dwarf_Abbrev abbrev, Dwarf_Signed *return_flag,
    Dwarf_Error *error)
{

	if (abbrev == NULL || return_flag == NULL) {
		DWARF_SET_ERROR(NULL, error, DW_DLE_ARGUMENT);
		return (DW_DLV_ERROR);
	}

	*return_flag = (Dwarf_Signed) abbrev->ab_children;

	return (DW_DLV_OK);
}

int
dwarf_get_abbrev_entry(Dwarf_Abbrev abbrev, Dwarf_Signed ndx,
    Dwarf_Half *attr_num, Dwarf_Signed *form, Dwarf_Off *offset,
    Dwarf_Error *error)
{
	Dwarf_AttrDef ad;
	int i;

	if (abbrev == NULL || attr_num == NULL || form == NULL ||
	    offset == NULL) {
		DWARF_SET_ERROR(NULL, error, DW_DLE_ARGUMENT);
		return (DW_DLV_ERROR);
	}

	if (ndx < 0 || (uint64_t) ndx >= abbrev->ab_atnum) {
		DWARF_SET_ERROR(NULL, error, DW_DLE_NO_ENTRY);
		return (DW_DLV_NO_ENTRY);
	}

	ad = STAILQ_FIRST(&abbrev->ab_attrdef);
	for (i = 0; i < ndx && ad != NULL; i++)
		ad = STAILQ_NEXT(ad, ad_next);

	assert(ad != NULL);

	*attr_num = ad->ad_attrib;
	*form = ad->ad_form;
	*offset = ad->ad_offset;

	return (DW_DLV_OK);
}