1/*	$NetBSD: vswprintf.c,v 1.1 2005/05/14 23:51:02 christos Exp $	*/
2
3/*
4 * Copyright (c) 1997 Todd C. Miller <Todd.Miller@courtesan.com>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. The name of the author may not be used to endorse or promote products
16 *    derived from this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
19 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
20 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
21 * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
22 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
23 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
24 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
25 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
26 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
27 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 */
29
30#include <sys/cdefs.h>
31#if defined(LIBC_SCCS) && !defined(lint)
32#if 0
33__FBSDID("$FreeBSD: src/lib/libc/stdio/vswprintf.c,v 1.6 2005/02/21 19:41:44 fjoe Exp $");
34#else
35__RCSID("$NetBSD: vswprintf.c,v 1.1 2005/05/14 23:51:02 christos Exp $");
36#endif
37#endif /* LIBC_SCCS and not lint */
38
39#include <errno.h>
40#include <stdio.h>
41#include <stdlib.h>
42#include <wchar.h>
43#include <stdarg.h>
44#include "reentrant.h"
45#include "local.h"
46
47int
48vswprintf(wchar_t * __restrict s, size_t n, const wchar_t * __restrict fmt,
49    va_list ap)
50{
51	static const mbstate_t initial;
52	mbstate_t mbs;
53	FILE f;
54	char *mbp;
55	int ret, sverrno;
56	size_t nwc;
57	struct __sfileext fext;
58
59	if (n == 0) {
60		errno = EINVAL;
61		return (-1);
62	}
63
64	_FILEEXT_SETUP(&f, &fext);
65	f._file = -1;
66	f._flags = __SWR | __SSTR | __SALC;
67	f._bf._base = f._p = (unsigned char *)malloc(128);
68	if (f._bf._base == NULL) {
69		errno = ENOMEM;
70		return (-1);
71	}
72	f._bf._size = f._w = 127;		/* Leave room for the NUL */
73	ret = __vfwprintf_unlocked(&f, fmt, ap);
74	if (ret < 0) {
75		sverrno = errno;
76		free(f._bf._base);
77		errno = sverrno;
78		return (-1);
79	}
80	*f._p = '\0';
81	mbp = (char *)f._bf._base;
82	/*
83	 * XXX Undo the conversion from wide characters to multibyte that
84	 * fputwc() did in __vfwprintf().
85	 */
86	mbs = initial;
87	nwc = mbsrtowcs(s, (void *)&mbp, n, &mbs);
88	free(f._bf._base);
89	if (nwc == (size_t)-1) {
90		errno = EILSEQ;
91		return (-1);
92	}
93	if (nwc == n) {
94		s[n - 1] = L'\0';
95		errno = EOVERFLOW;
96		return (-1);
97	}
98
99	return (ret);
100}
101