xref: /freebsd/lib/libc/locale/ascii.c (revision f5147e312f43a9050468de539aeafa072caa1a60)
1 /*-
2  * SPDX-License-Identifier: BSD-3-Clause
3  *
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  * Copyright (c) 2011 The FreeBSD Foundation
12  * All rights reserved.
13  * Portions of this software were developed by David Chisnall
14  * under sponsorship from the FreeBSD Foundation.
15  *
16  * Redistribution and use in source and binary forms, with or without
17  * modification, are permitted provided that the following conditions
18  * are met:
19  * 1. Redistributions of source code must retain the above copyright
20  *    notice, this list of conditions and the following disclaimer.
21  * 2. Redistributions in binary form must reproduce the above copyright
22  *    notice, this list of conditions and the following disclaimer in the
23  *    documentation and/or other materials provided with the distribution.
24  * 3. Neither the name of the University nor the names of its contributors
25  *    may be used to endorse or promote products derived from this software
26  *    without specific prior written permission.
27  *
28  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
29  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
30  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
31  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
32  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
33  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
34  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
35  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
36  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
37  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
38  * SUCH DAMAGE.
39  */
40 
41 #include <sys/cdefs.h>
42 __FBSDID("$FreeBSD$");
43 
44 #include <errno.h>
45 #include <limits.h>
46 #include <runetype.h>
47 #include <stddef.h>
48 #include <stdio.h>
49 #include <stdlib.h>
50 #include <string.h>
51 #include <wchar.h>
52 #include "mblocal.h"
53 
54 static size_t	_ascii_mbrtowc(wchar_t * __restrict, const char * __restrict,
55 		    size_t, mbstate_t * __restrict);
56 static int	_ascii_mbsinit(const mbstate_t *);
57 static size_t	_ascii_mbsnrtowcs(wchar_t * __restrict dst,
58 		    const char ** __restrict src, size_t nms, size_t len,
59 		    mbstate_t * __restrict ps __unused);
60 static size_t	_ascii_wcrtomb(char * __restrict, wchar_t,
61 		    mbstate_t * __restrict);
62 static size_t	_ascii_wcsnrtombs(char * __restrict, const wchar_t ** __restrict,
63 		    size_t, size_t, mbstate_t * __restrict);
64 
65 int
66 _ascii_init(struct xlocale_ctype *l,_RuneLocale *rl)
67 {
68 
69 	l->__mbrtowc = _ascii_mbrtowc;
70 	l->__mbsinit = _ascii_mbsinit;
71 	l->__mbsnrtowcs = _ascii_mbsnrtowcs;
72 	l->__wcrtomb = _ascii_wcrtomb;
73 	l->__wcsnrtombs = _ascii_wcsnrtombs;
74 	l->runes = rl;
75 	l->__mb_cur_max = 1;
76 	l->__mb_sb_limit = 128;
77 	return(0);
78 }
79 
80 static int
81 _ascii_mbsinit(const mbstate_t *ps __unused)
82 {
83 
84 	/*
85 	 * Encoding is not state dependent - we are always in the
86 	 * initial state.
87 	 */
88 	return (1);
89 }
90 
91 static size_t
92 _ascii_mbrtowc(wchar_t * __restrict pwc, const char * __restrict s, size_t n,
93     mbstate_t * __restrict ps __unused)
94 {
95 
96 	if (s == NULL)
97 		/* Reset to initial shift state (no-op) */
98 		return (0);
99 	if (n == 0)
100 		/* Incomplete multibyte sequence */
101 		return ((size_t)-2);
102 	if (*s & 0x80) {
103 		errno = EILSEQ;
104 		return ((size_t)-1);
105 	}
106 	if (pwc != NULL)
107 		*pwc = (unsigned char)*s;
108 	return (*s == '\0' ? 0 : 1);
109 }
110 
111 static size_t
112 _ascii_wcrtomb(char * __restrict s, wchar_t wc,
113     mbstate_t * __restrict ps __unused)
114 {
115 
116 	if (s == NULL)
117 		/* Reset to initial shift state (no-op) */
118 		return (1);
119 	if (wc < 0 || wc > 127) {
120 		errno = EILSEQ;
121 		return ((size_t)-1);
122 	}
123 	*s = (unsigned char)wc;
124 	return (1);
125 }
126 
127 static size_t
128 _ascii_mbsnrtowcs(wchar_t * __restrict dst, const char ** __restrict src,
129     size_t nms, size_t len, mbstate_t * __restrict ps __unused)
130 {
131 	const char *s;
132 	size_t nchr;
133 
134 	if (dst == NULL) {
135 		for (s = *src; nms > 0 && *s != '\0'; s++, nms--) {
136 			if (*s & 0x80) {
137 				errno = EILSEQ;
138 				return ((size_t)-1);
139 			}
140 		}
141 		return (s - *src);
142 	}
143 
144 	s = *src;
145 	nchr = 0;
146 	while (len-- > 0 && nms-- > 0) {
147 		if (*s & 0x80) {
148 			*src = s;
149 			errno = EILSEQ;
150 			return ((size_t)-1);
151 		}
152 		if ((*dst++ = (unsigned char)*s++) == L'\0') {
153 			*src = NULL;
154 			return (nchr);
155 		}
156 		nchr++;
157 	}
158 	*src = s;
159 	return (nchr);
160 }
161 
162 static size_t
163 _ascii_wcsnrtombs(char * __restrict dst, const wchar_t ** __restrict src,
164     size_t nwc, size_t len, mbstate_t * __restrict ps __unused)
165 {
166 	const wchar_t *s;
167 	size_t nchr;
168 
169 	if (dst == NULL) {
170 		for (s = *src; nwc > 0 && *s != L'\0'; s++, nwc--) {
171 			if (*s < 0 || *s > 127) {
172 				errno = EILSEQ;
173 				return ((size_t)-1);
174 			}
175 		}
176 		return (s - *src);
177 	}
178 
179 	s = *src;
180 	nchr = 0;
181 	while (len-- > 0 && nwc-- > 0) {
182 		if (*s < 0 || *s > 127) {
183 			*src = s;
184 			errno = EILSEQ;
185 			return ((size_t)-1);
186 		}
187 		if ((*dst++ = *s++) == '\0') {
188 			*src = NULL;
189 			return (nchr);
190 		}
191 		nchr++;
192 	}
193 	*src = s;
194 	return (nchr);
195 }
196 
197