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
25static int
26euc_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
81static int
82euc_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}
117