xref: /titanic_44/usr/src/lib/libc/port/locale/big5.c (revision 2d08521bd15501c8370ba2153b9cca4f094979d0)
1 /*
2  * Copyright 2013 Garrett D'Amore <garrett@damore.org>
3  * Copyright 2010 Nexenta Systems, Inc.  All rights reserved.
4  * Copyright (c) 2002-2004 Tim J. Robbins. All rights reserved.
5  * Copyright (c) 1993
6  *	The Regents of the University of California.  All rights reserved.
7  *
8  * This code is derived from software contributed to Berkeley by
9  * Paul Borman at Krystal Technologies.
10  *
11  * Redistribution and use in source and binary forms, with or without
12  * modification, are permitted provided that the following conditions
13  * are met:
14  * 1. Redistributions of source code must retain the above copyright
15  *    notice, this list of conditions and the following disclaimer.
16  * 2. Redistributions in binary form must reproduce the above copyright
17  *    notice, this list of conditions and the following disclaimer in the
18  *    documentation and/or other materials provided with the distribution.
19  * 4. Neither the name of the University nor the names of its contributors
20  *    may be used to endorse or promote products derived from this software
21  *    without specific prior written permission.
22  *
23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33  * SUCH DAMAGE.
34  */
35 
36 #include "lint.h"
37 #include <sys/types.h>
38 #include <errno.h>
39 #include <stdlib.h>
40 #include <string.h>
41 #include <wchar.h>
42 #include "mblocal.h"
43 #include "lctype.h"
44 
45 static size_t	_BIG5_mbrtowc(wchar_t *_RESTRICT_KYWD,
46 		    const char *_RESTRICT_KYWD,
47 		    size_t, mbstate_t *RESTRICT_KYWD);
48 static int	_BIG5_mbsinit(const mbstate_t *);
49 static size_t	_BIG5_wcrtomb(char *_RESTRICT_KYWD, wchar_t,
50 		    mbstate_t *_RESTRICT_KYWD);
51 static size_t	_BIG5_mbsnrtowcs(wchar_t *_RESTRICT_KYWD,
52 		    const char **_RESTRICT_KYWD, size_t, size_t,
53 		    mbstate_t *_RESTRICT_KYWD);
54 static size_t	_BIG5_wcsnrtombs(char *_RESTRICT_KYWD,
55 		    const wchar_t **_RESTRICT_KYWD, size_t, size_t,
56 		    mbstate_t *_RESTRICT_KYWD);
57 
58 typedef struct {
59 	wchar_t	ch;
60 } _BIG5State;
61 
62 void
_BIG5_init(struct lc_ctype * lct)63 _BIG5_init(struct lc_ctype *lct)
64 {
65 	lct->lc_mbrtowc = _BIG5_mbrtowc;
66 	lct->lc_wcrtomb = _BIG5_wcrtomb;
67 	lct->lc_mbsnrtowcs = _BIG5_mbsnrtowcs;
68 	lct->lc_wcsnrtombs = _BIG5_wcsnrtombs;
69 	lct->lc_mbsinit = _BIG5_mbsinit;
70 	lct->lc_max_mblen = 2;
71 	lct->lc_is_ascii = 0;
72 }
73 
74 static int
_BIG5_mbsinit(const mbstate_t * ps)75 _BIG5_mbsinit(const mbstate_t *ps)
76 {
77 
78 	return (ps == NULL || ((const _BIG5State *)ps)->ch == 0);
79 }
80 
81 static int
_big5_check(uint_t c)82 _big5_check(uint_t c)
83 {
84 
85 	c &= 0xff;
86 	return ((c >= 0xa1 && c <= 0xfe) ? 2 : 1);
87 }
88 
89 static size_t
_BIG5_mbrtowc(wchar_t * _RESTRICT_KYWD pwc,const char * _RESTRICT_KYWD s,size_t n,mbstate_t * _RESTRICT_KYWD ps)90 _BIG5_mbrtowc(wchar_t *_RESTRICT_KYWD pwc, const char *_RESTRICT_KYWD s,
91     size_t n, mbstate_t *_RESTRICT_KYWD ps)
92 {
93 	_BIG5State *bs;
94 	wchar_t wc;
95 	size_t len;
96 
97 	bs = (_BIG5State *)ps;
98 
99 	if ((bs->ch & ~0xFF) != 0) {
100 		/* Bad conversion state. */
101 		errno = EINVAL;
102 		return ((size_t)-1);
103 	}
104 
105 	if (s == NULL) {
106 		s = "";
107 		n = 1;
108 		pwc = NULL;
109 	}
110 
111 	if (n == 0)
112 		/* Incomplete multibyte sequence */
113 		return ((size_t)-2);
114 
115 	if (bs->ch != 0) {
116 		if (*s == '\0') {
117 			errno = EILSEQ;
118 			return ((size_t)-1);
119 		}
120 		wc = (bs->ch << 8) | (*s & 0xFF);
121 		if (pwc != NULL)
122 			*pwc = wc;
123 		bs->ch = 0;
124 		return (1);
125 	}
126 
127 	len = (size_t)_big5_check(*s);
128 	wc = *s++ & 0xff;
129 	if (len == 2) {
130 		if (n < 2) {
131 			/* Incomplete multibyte sequence */
132 			bs->ch = wc;
133 			return ((size_t)-2);
134 		}
135 		if (*s == '\0') {
136 			errno = EILSEQ;
137 			return ((size_t)-1);
138 		}
139 		wc = (wc << 8) | (*s++ & 0xff);
140 		if (pwc != NULL)
141 			*pwc = wc;
142 		return (2);
143 	} else {
144 		if (pwc != NULL)
145 			*pwc = wc;
146 		return (wc == L'\0' ? 0 : 1);
147 	}
148 }
149 
150 static size_t
_BIG5_wcrtomb(char * _RESTRICT_KYWD s,wchar_t wc,mbstate_t * _RESTRICT_KYWD ps)151 _BIG5_wcrtomb(char *_RESTRICT_KYWD s, wchar_t wc, mbstate_t *_RESTRICT_KYWD ps)
152 {
153 	_BIG5State *bs;
154 
155 	bs = (_BIG5State *)ps;
156 
157 	if (bs->ch != 0) {
158 		errno = EINVAL;
159 		return ((size_t)-1);
160 	}
161 
162 	if (s == NULL)
163 		/* Reset to initial shift state (no-op) */
164 		return (1);
165 	if (wc & 0x8000) {
166 		*s++ = (wc >> 8) & 0xff;
167 		*s = wc & 0xff;
168 		return (2);
169 	}
170 	*s = wc & 0xff;
171 	return (1);
172 }
173 
174 static size_t
_BIG5_mbsnrtowcs(wchar_t * _RESTRICT_KYWD dst,const char ** _RESTRICT_KYWD src,size_t nms,size_t len,mbstate_t * _RESTRICT_KYWD ps)175 _BIG5_mbsnrtowcs(wchar_t *_RESTRICT_KYWD dst, const char **_RESTRICT_KYWD src,
176     size_t nms, size_t len, mbstate_t *_RESTRICT_KYWD ps)
177 {
178 	return (__mbsnrtowcs_std(dst, src, nms, len, ps, _BIG5_mbrtowc));
179 }
180 
181 static size_t
_BIG5_wcsnrtombs(char * _RESTRICT_KYWD dst,const wchar_t ** _RESTRICT_KYWD src,size_t nwc,size_t len,mbstate_t * _RESTRICT_KYWD ps)182 _BIG5_wcsnrtombs(char *_RESTRICT_KYWD dst, const wchar_t **_RESTRICT_KYWD src,
183     size_t nwc, size_t len, mbstate_t *_RESTRICT_KYWD ps)
184 {
185 	return (__wcsnrtombs_std(dst, src, nwc, len, ps, _BIG5_wcrtomb));
186 }
187