ascii.c revision 301069 
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 * Copyright (c) 2011 The FreeBSD Foundation
10 * All rights reserved.
11 * Portions of this software were developed by David Chisnall
12 * under sponsorship from the FreeBSD Foundation.
13 *
14 * Redistribution and use in source and binary forms, with or without
15 * modification, are permitted provided that the following conditions
16 * are met:
17 * 1. Redistributions of source code must retain the above copyright
18 *    notice, this list of conditions and the following disclaimer.
19 * 2. Redistributions in binary form must reproduce the above copyright
20 *    notice, this list of conditions and the following disclaimer in the
21 *    documentation and/or other materials provided with the distribution.
22 * 4. Neither the name of the University nor the names of its contributors
23 *    may be used to endorse or promote products derived from this software
24 *    without specific prior written permission.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * SUCH DAMAGE.
37 */
38
39#include <sys/cdefs.h>
40__FBSDID("$FreeBSD: head/lib/libc/locale/ascii.c 301069 2016-05-31 18:44:33Z ache $");
41
42#include <errno.h>
43#include <limits.h>
44#include <runetype.h>
45#include <stddef.h>
46#include <stdio.h>
47#include <stdlib.h>
48#include <string.h>
49#include <wchar.h>
50#include "mblocal.h"
51
52static size_t	_ascii_mbrtowc(wchar_t * __restrict, const char * __restrict,
53		    size_t, mbstate_t * __restrict);
54static int	_ascii_mbsinit(const mbstate_t *);
55static size_t	_ascii_mbsnrtowcs(wchar_t * __restrict dst,
56		    const char ** __restrict src, size_t nms, size_t len,
57		    mbstate_t * __restrict ps __unused);
58static size_t	_ascii_wcrtomb(char * __restrict, wchar_t,
59		    mbstate_t * __restrict);
60static size_t	_ascii_wcsnrtombs(char * __restrict, const wchar_t ** __restrict,
61		    size_t, size_t, mbstate_t * __restrict);
62
63int
64_ascii_init(struct xlocale_ctype *l,_RuneLocale *rl)
65{
66
67	l->__mbrtowc = _ascii_mbrtowc;
68	l->__mbsinit = _ascii_mbsinit;
69	l->__mbsnrtowcs = _ascii_mbsnrtowcs;
70	l->__wcrtomb = _ascii_wcrtomb;
71	l->__wcsnrtombs = _ascii_wcsnrtombs;
72	l->runes = rl;
73	l->__mb_cur_max = 1;
74	l->__mb_sb_limit = 128;
75	return(0);
76}
77
78static int
79_ascii_mbsinit(const mbstate_t *ps __unused)
80{
81
82	/*
83	 * Encoding is not state dependent - we are always in the
84	 * initial state.
85	 */
86	return (1);
87}
88
89static size_t
90_ascii_mbrtowc(wchar_t * __restrict pwc, const char * __restrict s, size_t n,
91    mbstate_t * __restrict ps __unused)
92{
93
94	if (s == NULL)
95		/* Reset to initial shift state (no-op) */
96		return (0);
97	if (n == 0)
98		/* Incomplete multibyte sequence */
99		return ((size_t)-2);
100	if (*s & 0x80) {
101		errno = EILSEQ;
102		return ((size_t)-1);
103	}
104	if (pwc != NULL)
105		*pwc = (unsigned char)*s;
106	return (*s == '\0' ? 0 : 1);
107}
108
109static size_t
110_ascii_wcrtomb(char * __restrict s, wchar_t wc,
111    mbstate_t * __restrict ps __unused)
112{
113
114	if (s == NULL)
115		/* Reset to initial shift state (no-op) */
116		return (1);
117	if (wc < 0 || wc > 127) {
118		errno = EILSEQ;
119		return ((size_t)-1);
120	}
121	*s = (unsigned char)wc;
122	return (1);
123}
124
125static size_t
126_ascii_mbsnrtowcs(wchar_t * __restrict dst, const char ** __restrict src,
127    size_t nms, size_t len, mbstate_t * __restrict ps __unused)
128{
129	const char *s;
130	size_t nchr;
131
132	if (dst == NULL) {
133		for (s = *src; nms > 0 && *s != '\0'; s++, nms--) {
134			if (*s & 0x80) {
135				errno = EILSEQ;
136				return ((size_t)-1);
137			}
138		}
139		return (s - *src);
140	}
141
142	s = *src;
143	nchr = 0;
144	while (len-- > 0 && nms-- > 0) {
145		if (*s & 0x80) {
146			*src = s;
147			errno = EILSEQ;
148			return ((size_t)-1);
149		}
150		if ((*dst++ = (unsigned char)*s++) == L'\0') {
151			*src = NULL;
152			return (nchr);
153		}
154		nchr++;
155	}
156	*src = s;
157	return (nchr);
158}
159
160static size_t
161_ascii_wcsnrtombs(char * __restrict dst, const wchar_t ** __restrict src,
162    size_t nwc, size_t len, mbstate_t * __restrict ps __unused)
163{
164	const wchar_t *s;
165	size_t nchr;
166
167	if (dst == NULL) {
168		for (s = *src; nwc > 0 && *s != L'\0'; s++, nwc--) {
169			if (*s < 0 || *s > 127) {
170				errno = EILSEQ;
171				return ((size_t)-1);
172			}
173		}
174		return (s - *src);
175	}
176
177	s = *src;
178	nchr = 0;
179	while (len-- > 0 && nwc-- > 0) {
180		if (*s < 0 || *s > 127) {
181			*src = s;
182			errno = EILSEQ;
183			return ((size_t)-1);
184		}
185		if ((*dst++ = *s++) == '\0') {
186			*src = NULL;
187			return (nchr);
188		}
189		nchr++;
190	}
191	*src = s;
192	return (nchr);
193}
194
195