/*
 * 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) 1994 by Sun Microsystems, Inc.
 */


#include <errno.h>
#include "ktable.h"
#include "hangulcode.h"


extern kcode_table      euc2utf8_tbl[];


/****  _ W A N S U N G _ T O _ U T F 8  ****/

char _wansung_to_utf8(unsigned long* chosung, unsigned long* joongsung,
                                unsigned long* jongsung, unsigned short wcode)
{
        register short  h, i, j, l;
        short           ci, v, cf;
        short           disp;
        long            cfbit;

        if (wcode < 0xb0a1 || wcode > 0xc8fe)
        {  /* Hanja or special symbol */
                for (l = 0, h = MAX_E2U_NUM; l < h; )
                {
                        i = (l + h) / 2;
                        if (euc2utf8_tbl[i].code == wcode)
                                break;
                        else if (euc2utf8_tbl[l].code == wcode)
                        {
                                i = l;
                                break;
                        }
                        else if (euc2utf8_tbl[h].code == wcode)
                        {
                                i = h;
                                break;
                        }
                        else if (euc2utf8_tbl[i].code < wcode)
                                l = i + 1;
                        else
                                h = i - 1;
                }

                if (euc2utf8_tbl[i].code != wcode)
                        return(FAILED);

                *chosung = euc2utf8_tbl[i].utf8;
                return(HANJA_OR_SYMBOL);
        }

        if ((short)(wcode & 0xFF) < 0xA1)
                return(FAILED);

        /* Hangul processing. */
        for (h = CI_CNT, l = 0; ; )
        {
                ci = (l + h) / 2;
                if (l >= h)
                        break;
                if (wcode < cmp_srchtbl[ci][0])
                        h = ci - 1;
                else if (wcode < cmp_srchtbl[ci + 1][0])
                        break;
                else
                        l = ci + 1;
        }

        for (v = 1; ; )
        {
                if (wcode < cmp_srchtbl[ci][v])
                {
                        while (!cmp_srchtbl[ci][--v])
                                ;
                        break;
                }
                else if (v == V_CNT)
                        break;
                v++;
        }

        disp = wcode - cmp_srchtbl[ci][v];
        if (((short)(cmp_srchtbl[ci][v] & BYTE_MASK) + disp) > 0xfe)
                disp -= SKIP;

        for (cfbit = cmp_bitmap[ci][v], i = -1, cf = -1; i < disp; cf++)
        {
                if (cfbit & BIT_MASK)
                        i++;
                cfbit >>= 1;
        }

        if (cf == -1)
                return(FAILED);

        *chosung = 0xE18480 + ci;
        *joongsung = 0xE185A1 + v;
        /**** Original meaning is like below.
        *jongsung = (cf < 2) ? 0 <-- FILL character
                             : (cf > 25) ? 0xE18780 + cf - 26
                                         : 0xE186A8 + cf - 2;
        ****/
        *jongsung = (cf < 2) ? 0 : ((cf > 25) ? 0xE18766 + cf : 0xE186A6 + cf);
        return(HANGUL);
}  /* end of char _wansung_to_utf8(unsigned long*, unsigned long*,
                                unsigned long*, unsigned short). */