2 * Copyright (C) 1999-2001, 2004, 2016 Free Software Foundation, Inc.
3 * This file is part of the GNU LIBICONV Library.
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.
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.
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 <http://www.gnu.org/licenses/>.
24 /* Specification: RFC 3629 */
27 utf8_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, size_t n)
29 unsigned char c = s[0];
34 } else if (c < 0xc2) {
36 } else if (c < 0xe0) {
39 if (!((s[1] ^ 0x80) < 0x40))
41 *pwc = ((ucs4_t) (c & 0x1f) << 6)
42 | (ucs4_t) (s[1] ^ 0x80);
44 } else if (c < 0xf0) {
47 if (!((s[1] ^ 0x80) < 0x40 && (s[2] ^ 0x80) < 0x40
48 && (c >= 0xe1 || s[1] >= 0xa0)
49 && (c != 0xed || s[1] < 0xa0)))
51 *pwc = ((ucs4_t) (c & 0x0f) << 12)
52 | ((ucs4_t) (s[1] ^ 0x80) << 6)
53 | (ucs4_t) (s[2] ^ 0x80);
55 } else if (c < 0xf8 && sizeof(ucs4_t)*8 >= 32) {
58 if (!((s[1] ^ 0x80) < 0x40 && (s[2] ^ 0x80) < 0x40
59 && (s[3] ^ 0x80) < 0x40
60 && (c >= 0xf1 || s[1] >= 0x90)
61 && (c < 0xf4 || (c == 0xf4 && s[1] < 0x90))))
63 *pwc = ((ucs4_t) (c & 0x07) << 18)
64 | ((ucs4_t) (s[1] ^ 0x80) << 12)
65 | ((ucs4_t) (s[2] ^ 0x80) << 6)
66 | (ucs4_t) (s[3] ^ 0x80);
73 utf8_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, size_t n) /* n == 0 is acceptable */
80 else if (wc < 0x10000) {
81 if (wc < 0xd800 || wc >= 0xe000)
85 } else if (wc < 0x110000)
91 switch (count) { /* note: code falls through cases! */
92 case 4: r[3] = 0x80 | (wc & 0x3f); wc = wc >> 6; wc |= 0x10000;
93 case 3: r[2] = 0x80 | (wc & 0x3f); wc = wc >> 6; wc |= 0x800;
94 case 2: r[1] = 0x80 | (wc & 0x3f); wc = wc >> 6; wc |= 0xc0;