gbk.c revision 115626 
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
37#include <sys/cdefs.h>
38__FBSDID("$FreeBSD: head/lib/libc/locale/gbk.c 115626 2003-06-01 15:30:56Z ache $");
39
40#include <rune.h>
41#include <stddef.h>
42#include <stdio.h>
43#include <stdlib.h>
44#include <sys/types.h>
45
46rune_t  _GBK_sgetrune(const char *, size_t, char const **);
47int     _GBK_sputrune(rune_t, char *, size_t, char **);
48
49int
50_GBK_init(rl)
51	_RuneLocale *rl;
52{
53	rl->sgetrune = _GBK_sgetrune;
54	rl->sputrune = _GBK_sputrune;
55	_CurrentRuneLocale = rl;
56	__mb_cur_max = 2;
57	return (0);
58}
59
60static inline int
61_gbk_check(c)
62	u_int c;
63{
64	c &= 0xff;
65	return ((c >= 0x80 && c <= 0xfe) ? 2 : 1);
66}
67
68rune_t
69_GBK_sgetrune(string, n, result)
70	const char *string;
71	size_t n;
72	char const **result;
73{
74	rune_t rune = 0;
75	int len;
76
77	if (n < 1 || (len = _gbk_check(*string)) > n) {
78		if (result)
79			*result = string;
80		return (_INVALID_RUNE);
81	}
82	while (--len >= 0)
83		rune = (rune << 8) | ((u_int)(*string++) & 0xff);
84	if (result)
85		*result = string;
86	return rune;
87}
88
89int
90_GBK_sputrune(c, string, n, result)
91	rune_t c;
92	char *string, **result;
93	size_t n;
94{
95	if (c & 0x8000) {
96		if (n >= 2) {
97			string[0] = (c >> 8) & 0xff;
98			string[1] = c & 0xff;
99			if (result)
100				*result = string + 2;
101			return (2);
102		}
103	}
104	else {
105		if (n >= 1) {
106			*string = c & 0xff;
107			if (result)
108				*result = string + 1;
109			return (1);
110		}
111	}
112	if (result)
113		*result = string;
114	return (0);
115
116}
117