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libiconv

    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., 51 Franklin Street,
   18:  * Fifth Floor, Boston, MA 02110-1301, 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: }