wcstombs.c revision 102762 
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/wcstombs.c 102762 2002-09-01 07:08:22Z tjr $");
39
40#include <errno.h>
41#include <stdlib.h>
42#include <limits.h>
43#include <stddef.h>
44#include <rune.h>
45
46size_t
47wcstombs(s, pwcs, n)
48	char *__restrict s;
49	const wchar_t *__restrict pwcs;
50	size_t n;
51{
52	char buf[MB_LEN_MAX];
53	char *e;
54	int cnt, nb;
55
56	if (!pwcs || n > INT_MAX) {
57		errno = EINVAL;
58		return (-1);
59	}
60
61	cnt = 0;
62
63	if (s == NULL) {
64		/* Convert and count only, do not store. */
65		while (*pwcs != L'\0') {
66			if (!sputrune(*pwcs++, buf, MB_LEN_MAX, &e)) {
67				errno = EILSEQ;
68				return (-1);
69			}
70			cnt += e - buf;
71		}
72		return (cnt);
73	}
74
75	/* Convert, store and count characters. */
76	nb = n;
77	while (nb > 0) {
78		if (*pwcs == 0) {
79			*s = 0;
80			break;
81		}
82		if (!sputrune(*pwcs++, s, nb, &e)) {
83			errno = EILSEQ;
84			return (-1);
85		}
86		if (!e)			/* too long */
87			return (cnt);
88		cnt += e - s;
89		nb -= e - s;
90		s = e;
91	}
92
93	return (cnt);
94}
95