big5.c revision 92905 
1/*-
2 * Copyright (c) 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * Paul Borman at Krystal Technologies.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 *    must display the following acknowledgement:
18 *	This product includes software developed by the University of
19 *	California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 *    may be used to endorse or promote products derived from this software
22 *    without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 *
36 * $FreeBSD: head/lib/libc/locale/big5.c 92905 2002-03-21 22:49:10Z obrien $
37 */
38
39#if defined(LIBC_SCCS) && !defined(lint)
40static char sccsid[] = "@(#)big5.c	8.1 (Berkeley) 6/4/93";
41#endif /* LIBC_SCCS and not lint */
42
43#include <rune.h>
44#include <stddef.h>
45#include <stdio.h>
46#include <stdlib.h>
47#include <sys/types.h>
48
49rune_t	_BIG5_sgetrune(const char *, size_t, char const **);
50int	_BIG5_sputrune(rune_t, char *, size_t, char **);
51
52int
53_BIG5_init(rl)
54	_RuneLocale *rl;
55{
56	rl->sgetrune = _BIG5_sgetrune;
57	rl->sputrune = _BIG5_sputrune;
58	_CurrentRuneLocale = rl;
59	__mb_cur_max = 2;
60	return (0);
61}
62
63static inline int
64_big5_check(c)
65	u_int c;
66{
67	c &= 0xff;
68	return ((c >= 0xa1 && c <= 0xfe) ? 2 : 1);
69}
70
71rune_t
72_BIG5_sgetrune(string, n, result)
73	const char *string;
74	size_t n;
75	char const **result;
76{
77	rune_t rune = 0;
78	int len;
79
80	if (n < 1 || (len = _big5_check(*string)) > n) {
81		if (result)
82			*result = string;
83		return (_INVALID_RUNE);
84	}
85	while (--len >= 0)
86		rune = (rune << 8) | ((u_int)(*string++) & 0xff);
87	if (result)
88		*result = string;
89	return rune;
90}
91
92int
93_BIG5_sputrune(c, string, n, result)
94	rune_t c;
95	char *string, **result;
96	size_t n;
97{
98	if (c & 0x8000) {
99		if (n >= 2) {
100			string[0] = (c >> 8) & 0xff;
101			string[1] = c & 0xff;
102			if (result)
103				*result = string + 2;
104			return (2);
105		}
106	}
107	else {
108		if (n >= 1) {
109			*string = c & 0xff;
110			if (result)
111				*result = string + 1;
112			return (1);
113		}
114	}
115	if (result)
116		*result = string;
117	return (0);
118
119}
120