lib/euc_cn.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  * EUC-CN
  22  */
  23
  24 static int
  25 euc_cn_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, size_t n)
  26 {
  27   unsigned char c = *s;
  28   /* Code set 0 (ASCII or GB 1988-89) */
  29   if (c < 0x80)
  30     return ascii_mbtowc(conv,pwc,s,n);
  31   /* Code set 1 (GB 2312-1980) */
  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 >= 0xa1 && c2 < 0xff) {
  38         unsigned char buf[2];
  39         buf[0] = c-0x80; buf[1] = c2-0x80;
  40         return gb2312_mbtowc(conv,pwc,buf,2);
  41       } else
  42         return RET_ILSEQ;
  43     }
  44   }
  45   return RET_ILSEQ;
  46 }
  47
  48 static int
  49 euc_cn_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, size_t n)
  50 {
  51   unsigned char buf[2];
  52   int ret;
  53
  54   /* Code set 0 (ASCII or GB 1988-89) */
  55   ret = ascii_wctomb(conv,r,wc,n);
  56   if (ret != RET_ILUNI)
  57     return ret;
  58
  59   /* Code set 1 (GB 2312-1980) */
  60   ret = gb2312_wctomb(conv,buf,wc,2);
  61   if (ret != RET_ILUNI) {
  62     if (ret != 2) abort();
  63     if (n < 2)
  64       return RET_TOOSMALL;
  65     r[0] = buf[0]+0x80;
  66     r[1] = buf[1]+0x80;
  67     return 2;
  68   }
  69
  70   return RET_ILUNI;
  71 }