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 * UTF-32BE
23 */
24
25 /* Specification: Unicode 3.1 Standard Annex #19 */
26
27 static int
utf32be_mbtowc(conv_t conv,ucs4_t * pwc,const unsigned char * s,int n)28 utf32be_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, int n)
29 {
30 if (n >= 4) {
31 ucs4_t wc = (s[0] << 24) + (s[1] << 16) + (s[2] << 8) + s[3];
32 if (wc < 0x110000 && !(wc >= 0xd800 && wc < 0xe000)) {
33 *pwc = wc;
34 return 4;
35 } else
36 return RET_ILSEQ;
37 }
38 return RET_TOOFEW(0);
39 }
40
41 static int
utf32be_wctomb(conv_t conv,unsigned char * r,ucs4_t wc,int n)42 utf32be_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, int n)
43 {
44 if (wc < 0x110000 && !(wc >= 0xd800 && wc < 0xe000)) {
45 if (n >= 4) {
46 r[0] = 0;
47 r[1] = (unsigned char) (wc >> 16);
48 r[2] = (unsigned char) (wc >> 8);
49 r[3] = (unsigned char) wc;
50 return 4;
51 } else
52 return RET_TOOSMALL;
53 }
54 return RET_ILUNI;
55 }
56