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Initial revision

    1: /*
    2:  * Copyright (C) 1999-2001 Free Software Foundation, Inc.
    3:  * This file is part of the GNU LIBICONV Library.
    4:  *
    5:  * The GNU LIBICONV Library is free software; you can redistribute it
    6:  * and/or modify it under the terms of the GNU Library General Public
    7:  * License as published by the Free Software Foundation; either version 2
    8:  * of the License, or (at your option) any later version.
    9:  *
   10:  * The GNU LIBICONV Library is distributed in the hope that it will be
   11:  * useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
   12:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   13:  * Library General Public License for more details.
   14:  *
   15:  * You should have received a copy of the GNU Library General Public
   16:  * License along with the GNU LIBICONV Library; see the file COPYING.LIB.
   17:  * If not, write to the Free Software Foundation, Inc., 51 Franklin Street,
   18:  * Fifth Floor, Boston, MA 02110-1301, USA.
   19:  */
   20: 
   21: /*
   22:  * CNS 11643-1992 plane 4
   23:  */
   24: 
   25: /*
   26:  * The table has been split into two parts. Each part's entries fit it 16 bits.
   27:  * But the combined table would need 17 bits per entry.
   28:  */
   29: #include "cns11643_4a.h"
   30: #include "cns11643_4b.h"
   31: 
   32: static int
   33: cns11643_4_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, int n)
   34: {
   35:   unsigned char c1 = s[0];
   36:   if ((c1 >= 0x21 && c1 <= 0x6e)) {
   37:     if (n >= 2) {
   38:       unsigned char c2 = s[1];
   39:       if (c2 >= 0x21 && c2 < 0x7f) {
   40:         unsigned int i = 94 * (c1 - 0x21) + (c2 - 0x21);
   41:         ucs4_t wc = 0xfffd;
   42:         unsigned short swc;
   43:         {
   44:           if (i < 2914)
   45:             swc = cns11643_4a_2uni_page21[i],
   46:             wc = cns11643_4a_2uni_upages[swc>>8] | (swc & 0xff);
   47:           else if (i < 7298)
   48:             swc = cns11643_4b_2uni_page40[i-2914],
   49:             wc = cns11643_4b_2uni_upages[swc>>8] | (swc & 0xff);
   50:         }
   51:         if (wc != 0xfffd) {
   52:           *pwc = wc;
   53:           return 2;
   54:         }
   55:       }
   56:       return RET_ILSEQ;
   57:     }
   58:     return RET_TOOFEW(0);
   59:   }
   60:   return RET_ILSEQ;
   61: }