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
48 int
vsnprintf_l(char * __restrict str,size_t n,locale_t locale,const char * __restrict fmt,__va_list ap)49 vsnprintf_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 }
81 int
vsnprintf(char * __restrict str,size_t n,const char * __restrict fmt,__va_list ap)82 vsnprintf(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