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libiconv 1.16

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