/*
 * 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      johap922utf8_tbl[];


/****  _ J O H A P 9 2 _ T O _ U T F 8  ****/

char _johap92_to_utf8(unsigned long* chosung, unsigned long* joongsung,
                                unsigned long* jongsung, unsigned short wcode)
{
        register short  h, i, j, l;
        short           ci, v, cf;
        unsigned char   byte1, byte2;

        if (wcode > 0xD3FE)
        {  /* Hanja or special symbol */
                for (l = 0, h = MAX_J922U_NUM; l < h; )
                {
                        i = (l + h) / 2;
                        if (johap922utf8_tbl[i].code == wcode)
                                break;
                        else if (johap922utf8_tbl[l].code == wcode)
                        {
                                i = l;
                                break;
                        }
                        else if (johap922utf8_tbl[h].code == wcode)
                        {
                                i = h;
                                break;
                        }
                        else if (johap922utf8_tbl[i].code < wcode)
                                l = i + 1;
                        else
                                h = i - 1;
                }

                if (johap922utf8_tbl[i].code != wcode)
                        return(ILLEGAL_SEQ);

                *chosung = johap922utf8_tbl[i].utf8;
                return(HANJA_OR_SYMBOL);
        }

        /* Hangul processing. */
        byte1 = (char)((wcode >> 8) & 0xFF);
        byte2 = (char)(wcode & 0xFF);
        if (byte1 < 0x84 || byte1 > 0xD3 || byte2 < 0x41 || byte2 > 0xFE ||
            (byte2 > 0x7E && byte2 < 0x81))
                return(ILLEGAL_SEQ);

        ci = CHOSUNG(wcode) - 2;
        v = JOONGSUNG(wcode) -
                ((unsigned short)((unsigned short)JOONGSUNG(wcode) - 2) /
                        ((unsigned short)8) * 2 + 3);
        cf = JONGSUNG(wcode) - (unsigned short)JONGSUNG(wcode) / 18;
        *chosung = (ci < 0) ? 0xE1859F : 0xE18480 + ci;
        *joongsung = (v < 0) ? 0xE185A0 : 0xE185A1 + v;
        *jongsung = (cf < 2) ? 0 : ((cf > 25) ? 0xE18766 + cf : 0xE186A6 + cf);
        return(HANGUL);
}  /* end of char _johap92_to_utf8(unsigned long*, unsigned long*,
                                unsigned long*, unsigned short). */