lib/euc_tw.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, write to the Free Software Foundation, Inc., 59 Temple Place -
  18  * Suite 330, Boston, MA 02111-1307, USA.
  19  */
  20
  21 /*
  22  * EUC-TW
  23  */
  24
  25 static int
  26 euc_tw_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 (CNS 11643-1992 Plane 1) */
  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 cns11643_1_mbtowc(conv,pwc,buf,2);
  42       } else
  43         return RET_ILSEQ;
  44     }
  45   }
  46   /* Code set 2 (CNS 11643-1992 Planes 1-16) */
  47   if (c == 0x8e) {
  48     if (n < 4)
  49       return RET_TOOFEW(0);
  50     {
  51       unsigned char c2 = s[1];
  52       if (c2 >= 0xa1 && c2 <= 0xb0) {
  53         unsigned char c3 = s[2];
  54         unsigned char c4 = s[3];
  55         if (c3 >= 0xa1 && c3 < 0xff && c4 >= 0xa1 && c4 < 0xff) {
  56           unsigned char buf[2];
  57           int ret;
  58           buf[0] = c3-0x80; buf[1] = c4-0x80;
  59           switch (c2-0xa0) {
  60             case 1: ret = cns11643_1_mbtowc(conv,pwc,buf,2); break;
  61             case 2: ret = cns11643_2_mbtowc(conv,pwc,buf,2); break;
  62             case 3: ret = cns11643_3_mbtowc(conv,pwc,buf,2); break;
  63             case 4: ret = cns11643_4_mbtowc(conv,pwc,buf,2); break;
  64             case 5: ret = cns11643_5_mbtowc(conv,pwc,buf,2); break;
  65             case 6: ret = cns11643_6_mbtowc(conv,pwc,buf,2); break;
  66             case 7: ret = cns11643_7_mbtowc(conv,pwc,buf,2); break;
  67             case 15: ret = cns11643_15_mbtowc(conv,pwc,buf,2); break;
  68             default: return RET_ILSEQ;
  69           }
  70           if (ret == RET_ILSEQ)
  71             return RET_ILSEQ;
  72           if (ret != 2) abort();
  73           return 4;
  74         }
  75       }
  76     }
  77   }
  78   return RET_ILSEQ;
  79 }
  80
  81 static int
  82 euc_tw_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, int n)
  83 {
  84   unsigned char buf[3];
  85   int ret;
  86
  87   /* Code set 0 (ASCII) */
  88   ret = ascii_wctomb(conv,r,wc,n);
  89   if (ret != RET_ILUNI)
  90     return ret;
  91
  92   ret = cns11643_wctomb(conv,buf,wc,3);
  93   if (ret != RET_ILUNI) {
  94     if (ret != 3) abort();
  95
  96     /* Code set 1 (CNS 11643-1992 Plane 1) */
  97     if (buf[0] == 1) {
  98       if (n < 2)
  99         return RET_TOOSMALL;
 100       r[0] = buf[1]+0x80;
 101       r[1] = buf[2]+0x80;
 102       return 2;
 103     }
 104
 105     /* Code set 2 (CNS 11643-1992 Planes 1-16) */
 106     if (n < 4)
 107       return RET_TOOSMALL;
 108     r[0] = 0x8e;
 109     r[1] = buf[0]+0xa0;
 110     r[2] = buf[1]+0x80;
 111     r[3] = buf[2]+0x80;
 112     return 4;
 113   }
 114
 115   return RET_ILUNI;
 116 }