/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright (c) 1999 by Sun Microsystems, Inc.
 */


#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include "common_thai.h"
#include "ibm_thai_table.h"
#include "common_utf.h"
#include "common_euc.h"

static int node_compare(const void *node1, const void *node2)
{
        return(((int)(((const hcode_table *)node1)->code) -
                (int)(((const hcode_table *)node2)->code)));
}

/****  IBM Cp838 to IBM Cp 874 ****/

hcode_type _838_to_874(hcode_type euc_code)
{
        hcode_table *node_ptr, node;
        hcode_type utf_code;
        int     udc_index;

        /* User Definable Area Check */
        /* For Thai, this if statement will not be used.*/
        /* I retain them because it's the part of the   */
        /* framework.  To maintain, look down 21 lines. */

        if ((EUC_UDC_SEG1 == euc_code.byte.byte3) ||
            (EUC_UDC_SEG2 == euc_code.byte.byte3)) {
                if ((euc_code.byte.byte4 < EUC_UDC_OFFSET_START) ||
                    (EUC_UDC_OFFSET_END < euc_code.byte.byte4)) {
                        /* beyond the UDC area */
                        utf_code.code = 0;

                        return(utf_code);
                }

                udc_index = (euc_code.byte.byte3 == EUC_UDC_SEG1) ?
                                0 : EUC_UDC_SEG_GAP;
                udc_index += (int)(euc_code.byte.byte4 - EUC_UDC_OFFSET_START);

                utf_code = _udcidx_to_utf(udc_index);

                if (utf_code.code == UTF_UDC_ERROR)
                        utf_code.code = 0;      /* Failed */

                return(utf_code);
        }

        /* For Thai, this function starts here  */
        /* To change table, just change table   */
        /* name 5 lines below.                  */

        node.code = euc_code.word.low;

        node_ptr = bsearch( &node,
                ibm838_874_tbl, sizeof(ibm838_874_tbl)/sizeof(hcode_table),
                sizeof(hcode_table), node_compare);

        if (node_ptr != NULL) /* Success */
                return(node_ptr->utf8);
        else {                  /* Failed */
                utf_code.code = 0;
                return(utf_code);
        }

}  /* end of hcode_type _874_to_838(hcode_type euc_code) */