lib/cns11643_4.h

   1 /*
   2  * Copyright (C) 1999-2001, 2016 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 Lesser General Public
   7  * License as published by the Free Software Foundation; either version 2.1
   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  * Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General Public
  16  * License along with the GNU LIBICONV Library; see the file COPYING.LIB.
  17  * If not, see <https://www.gnu.org/licenses/>.
  18  */
  19
  20 /*
  21  * CNS 11643-1992 plane 4
  22  */
  23
  24 /*
  25  * The table has been split into two parts. Each part's entries fit it 16 bits.
  26  * But the combined table would need 17 bits per entry.
  27  */
  28 #include "cns11643_4a.h"
  29 #include "cns11643_4b.h"
  30
  31 static int
  32 cns11643_4_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, size_t n)
  33 {
  34   unsigned char c1 = s[0];
  35   if ((c1 >= 0x21 && c1 <= 0x6e)) {
  36     if (n >= 2) {
  37       unsigned char c2 = s[1];
  38       if (c2 >= 0x21 && c2 < 0x7f) {
  39         unsigned int i = 94 * (c1 - 0x21) + (c2 - 0x21);
  40         ucs4_t wc = 0xfffd;
  41         unsigned short swc;
  42         {
  43           if (i < 2914)
  44             swc = cns11643_4a_2uni_page21[i],
  45             wc = cns11643_4a_2uni_upages[swc>>8] | (swc & 0xff);
  46           else if (i < 7298)
  47             swc = cns11643_4b_2uni_page40[i-2914],
  48             wc = cns11643_4b_2uni_upages[swc>>8] | (swc & 0xff);
  49         }
  50         if (wc != 0xfffd) {
  51           *pwc = wc;
  52           return 2;
  53         }
  54       }
  55       return RET_ILSEQ;
  56     }
  57     return RET_TOOFEW(0);
  58   }
  59   return RET_ILSEQ;
  60 }