ascii.c revision 175553 
1/*-
2 * Copyright (c) 2002-2004 Tim J. Robbins. All rights reserved.
3 * Copyright (c) 1993
4 *	The Regents of the University of California.  All rights reserved.
5 *
6 * This code is derived from software contributed to Berkeley by
7 * Paul Borman at Krystal Technologies.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 *    notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 *    notice, this list of conditions and the following disclaimer in the
16 *    documentation and/or other materials provided with the distribution.
17 * 4. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#include <sys/cdefs.h>
35__FBSDID("$FreeBSD: head/lib/libc/locale/ascii.c 175553 2008-01-21 23:48:12Z ache $");
36
37#include <errno.h>
38#include <limits.h>
39#include <runetype.h>
40#include <stddef.h>
41#include <stdio.h>
42#include <stdlib.h>
43#include <string.h>
44#include <wchar.h>
45#include "mblocal.h"
46
47static size_t	_ascii_mbrtowc(wchar_t * __restrict, const char * __restrict,
48		    size_t, mbstate_t * __restrict);
49static int	_ascii_mbsinit(const mbstate_t *);
50static size_t	_ascii_mbsnrtowcs(wchar_t * __restrict dst,
51		    const char ** __restrict src, size_t nms, size_t len,
52		    mbstate_t * __restrict ps __unused);
53static size_t	_ascii_wcrtomb(char * __restrict, wchar_t,
54		    mbstate_t * __restrict);
55static size_t	_ascii_wcsnrtombs(char * __restrict, const wchar_t ** __restrict,
56		    size_t, size_t, mbstate_t * __restrict);
57
58int
59_ascii_init(_RuneLocale *rl)
60{
61
62	__mbrtowc = _ascii_mbrtowc;
63	__mbsinit = _ascii_mbsinit;
64	__mbsnrtowcs = _ascii_mbsnrtowcs;
65	__wcrtomb = _ascii_wcrtomb;
66	__wcsnrtombs = _ascii_wcsnrtombs;
67	_CurrentRuneLocale = rl;
68	__mb_cur_max = 1;
69	__mb_sb_limit = 128;
70	return(0);
71}
72
73static int
74_ascii_mbsinit(const mbstate_t *ps __unused)
75{
76
77	/*
78	 * Encoding is not state dependent - we are always in the
79	 * initial state.
80	 */
81	return (1);
82}
83
84static size_t
85_ascii_mbrtowc(wchar_t * __restrict pwc, const char * __restrict s, size_t n,
86    mbstate_t * __restrict ps __unused)
87{
88
89	if (s == NULL)
90		/* Reset to initial shift state (no-op) */
91		return (0);
92	if (n == 0)
93		/* Incomplete multibyte sequence */
94		return ((size_t)-2);
95	if (*s & 0x80) {
96		errno = EILSEQ;
97		return ((size_t)-1);
98	}
99	if (pwc != NULL)
100		*pwc = (unsigned char)*s;
101	return (*s == '\0' ? 0 : 1);
102}
103
104static size_t
105_ascii_wcrtomb(char * __restrict s, wchar_t wc,
106    mbstate_t * __restrict ps __unused)
107{
108
109	if (s == NULL)
110		/* Reset to initial shift state (no-op) */
111		return (1);
112	if (wc < 0 || wc > 127) {
113		errno = EILSEQ;
114		return ((size_t)-1);
115	}
116	*s = (unsigned char)wc;
117	return (1);
118}
119
120static size_t
121_ascii_mbsnrtowcs(wchar_t * __restrict dst, const char ** __restrict src,
122    size_t nms, size_t len, mbstate_t * __restrict ps __unused)
123{
124	const char *s;
125	size_t nchr;
126
127	if (dst == NULL) {
128		for (s = *src; nms > 0 && *s != '\0'; s++, nms--) {
129			if (*s & 0x80) {
130				errno = EILSEQ;
131				return ((size_t)-1);
132			}
133		}
134		return (s - *src);
135	}
136
137	s = *src;
138	nchr = 0;
139	while (len-- > 0 && nms-- > 0) {
140		if (*s & 0x80) {
141			errno = EILSEQ;
142			return ((size_t)-1);
143		}
144		if ((*dst++ = (unsigned char)*s++) == L'\0') {
145			*src = NULL;
146			return (nchr);
147		}
148		nchr++;
149	}
150	*src = s;
151	return (nchr);
152}
153
154static size_t
155_ascii_wcsnrtombs(char * __restrict dst, const wchar_t ** __restrict src,
156    size_t nwc, size_t len, mbstate_t * __restrict ps __unused)
157{
158	const wchar_t *s;
159	size_t nchr;
160
161	if (dst == NULL) {
162		for (s = *src; nwc > 0 && *s != L'\0'; s++, nwc--) {
163			if (*s < 0 || *s > 127) {
164				errno = EILSEQ;
165				return ((size_t)-1);
166			}
167		}
168		return (s - *src);
169	}
170
171	s = *src;
172	nchr = 0;
173	while (len-- > 0 && nwc-- > 0) {
174		if (*s < 0 || *s > 127) {
175			errno = EILSEQ;
176			return ((size_t)-1);
177		}
178		if ((*dst++ = *s++) == '\0') {
179			*src = NULL;
180			return (nchr);
181		}
182		nchr++;
183	}
184	*src = s;
185	return (nchr);
186}
187
188