lib/euc_cn.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  * EUC-CN
  23  */
  24
  25 static int
  26 euc_cn_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, int n)
  27 {
  28   unsigned char c = *s;
  29   /* Code set 0 (ASCII or GB 1988-89) */
  30   if (c < 0x80)
  31     return ascii_mbtowc(conv,pwc,s,n);
  32   /* Code set 1 (GB 2312-1980) */
  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 >= 0xa1 && c2 < 0xff) {
  39         unsigned char buf[2];
  40         buf[0] = c-0x80; buf[1] = c2-0x80;
  41         return gb2312_mbtowc(conv,pwc,buf,2);
  42       } else
  43         return RET_ILSEQ;
  44     }
  45   }
  46   return RET_ILSEQ;
  47 }
  48
  49 static int
  50 euc_cn_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, int n)
  51 {
  52   unsigned char buf[2];
  53   int ret;
  54
  55   /* Code set 0 (ASCII or GB 1988-89) */
  56   ret = ascii_wctomb(conv,r,wc,n);
  57   if (ret != RET_ILSEQ)
  58     return ret;
  59
  60   /* Code set 1 (GB 2312-1980) */
  61   ret = gb2312_wctomb(conv,buf,wc,2);
  62   if (ret != RET_ILSEQ) {
  63     if (ret != 2) abort();
  64     if (n < 2)
  65       return RET_TOOSMALL;
  66     r[0] = buf[0]+0x80;
  67     r[1] = buf[1]+0x80;
  68     return 2;
  69   }
  70
  71   return RET_ILSEQ;
  72 }