lib/ces_big5.h

   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, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 /*
  21  * BIG-5
  22  */
  23
  24 static int
  25 ces_big5_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, int n)
  26 {
  27   unsigned char c = *s;
  28   /* Code set 0 (ASCII) */
  29   if (c < 0x80)
  30     return ascii_mbtowc(conv,pwc,s,n);
  31   /* Code set 1 (BIG5) */
  32   if (c >= 0xa1 && c < 0xff) {
  33     if (n < 2)
  34       return RET_TOOFEW(0);
  35     {
  36       unsigned char c2 = s[1];
  37       if ((c2 >= 0x40 && c2 < 0x7f) || (c2 >= 0xa1 && c2 < 0xff))
  38         return big5_mbtowc(conv,pwc,s,2);
  39       else
  40         return RET_ILSEQ;
  41     }
  42   }
  43   return RET_ILSEQ;
  44 }
  45
  46 static int
  47 ces_big5_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, int n)
  48 {
  49   unsigned char buf[2];
  50   int ret;
  51
  52   /* Code set 0 (ASCII) */
  53   ret = ascii_wctomb(conv,r,wc,n);
  54   if (ret != RET_ILUNI)
  55     return ret;
  56
  57   /* Code set 1 (BIG5) */
  58   ret = big5_wctomb(conv,buf,wc,2);
  59   if (ret != RET_ILUNI) {
  60     if (ret != 2) abort();
  61     if (n < 2)
  62       return RET_TOOSMALL;
  63     r[0] = buf[0];
  64     r[1] = buf[1];
  65     return 2;
  66   }
  67
  68   return RET_ILUNI;
  69 }