lib/ces_big5.h

   1 /*
   2  * Copyright (C) 1999-2000 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., 59 Temple Place -
  18  * Suite 330, Boston, MA 02111-1307, USA.
  19  */
  20
  21 /*
  22  * BIG-5
  23  */
  24
  25 static int
  26 ces_big5_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, int n)
  27 {
  28   unsigned char c = *s;
  29   /* Code set 0 (ASCII) */
  30   if (c < 0x80)
  31     return ascii_mbtowc(conv,pwc,s,n);
  32   /* Code set 1 (BIG5) */
  33   if (c >= 0xa1 && c < 0xff) {
  34     if (n < 2)
  35       return RET_TOOFEW(0);
  36     {
  37       unsigned char c2 = s[1];
  38       if ((c2 >= 0x40 && c2 < 0x7f) || (c2 >= 0xa1 && c2 < 0xff))
  39         return big5_mbtowc(conv,pwc,s,2);
  40       else
  41         return RET_ILSEQ;
  42     }
  43   }
  44   return RET_ILSEQ;
  45 }
  46
  47 static int
  48 ces_big5_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, int n)
  49 {
  50   unsigned char buf[2];
  51   int ret;
  52
  53   /* Code set 0 (ASCII) */
  54   ret = ascii_wctomb(conv,r,wc,n);
  55   if (ret != RET_ILSEQ)
  56     return ret;
  57
  58   /* Code set 1 (BIG5) */
  59   ret = big5_wctomb(conv,buf,wc,2);
  60   if (ret != RET_ILSEQ) {
  61     if (ret != 2) abort();
  62     if (n < 2)
  63       return RET_TOOSMALL;
  64     r[0] = buf[0];
  65     r[1] = buf[1];
  66     return 2;
  67   }
  68
  69   return RET_ILSEQ;
  70 }