1/*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1990, 1993
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * Chris Torek.
9 *
10 * Copyright (c) 2011 The FreeBSD Foundation
11 *
12 * Portions of this software were developed by David Chisnall
13 * under sponsorship from the FreeBSD Foundation.
14 *
15 * Redistribution and use in source and binary forms, with or without
16 * modification, are permitted provided that the following conditions
17 * are met:
18 * 1. Redistributions of source code must retain the above copyright
19 *    notice, this list of conditions and the following disclaimer.
20 * 2. Redistributions in binary form must reproduce the above copyright
21 *    notice, this list of conditions and the following disclaimer in the
22 *    documentation and/or other materials provided with the distribution.
23 * 3. Neither the name of the University nor the names of its contributors
24 *    may be used to endorse or promote products derived from this software
25 *    without specific prior written permission.
26 *
27 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
30 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
37 * SUCH DAMAGE.
38 */
39
40#include <errno.h>
41#include <limits.h>
42#include <stdio.h>
43#include "local.h"
44#include "xlocale_private.h"
45
46#undef vsnprintf	/* _FORTIFY_SOURCE */
47
48int
49vsnprintf_l(char * __restrict str, size_t n, locale_t locale,
50		const char * __restrict fmt, __va_list ap)
51{
52	size_t on;
53	int ret;
54	char dummy[2];
55	FILE f = FAKE_FILE;
56	FIX_LOCALE(locale);
57
58	on = n;
59	if (n != 0)
60		n--;
61	if (n > INT_MAX) {
62		errno = EOVERFLOW;
63		*str = '\0';
64		return (EOF);
65	}
66	/* Stdio internals do not deal correctly with zero length buffer */
67	if (n == 0) {
68		if (on > 0)
69	  		*str = '\0';
70		str = dummy;
71		n = 1;
72	}
73	f._flags = __SWR | __SSTR;
74	f._bf._base = f._p = (unsigned char *)str;
75	f._bf._size = f._w = n;
76	ret = __vfprintf(&f, locale, fmt, ap);
77	if (on > 0)
78		*f._p = '\0';
79	return (ret);
80}
81int
82vsnprintf(char * __restrict str, size_t n, const char * __restrict fmt,
83    __va_list ap)
84{
85	return vsnprintf_l(str, n, __get_locale(), fmt, ap);
86}
87