1 /*-
2 * Copyright (c) 1990, 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 * Chris Torek.
7 *
8 * Copyright (c) 2011 The FreeBSD Foundation
9 * All rights reserved.
10 * Portions of this software were developed by David Chisnall
11 * under sponsorship from the FreeBSD Foundation.
12 *
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
15 * are met:
16 * 1. Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution.
21 * 3. Neither the name of the University nor the names of its contributors
22 * may be used to endorse or promote products derived from this software
23 * without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * SUCH DAMAGE.
36 */
37
38 #if defined(LIBC_SCCS) && !defined(lint)
39 static char sccsid[] = "@(#)vsnprintf.c 8.1 (Berkeley) 6/4/93";
40 #endif /* LIBC_SCCS and not lint */
41 #include <sys/cdefs.h>
42 __FBSDID("$FreeBSD$");
43
44 #include <errno.h>
45 #include <limits.h>
46 #include <stdio.h>
47 #include "local.h"
48 #include "xlocale_private.h"
49
50 int
vsnprintf_l(char * __restrict str,size_t n,locale_t locale,const char * __restrict fmt,__va_list ap)51 vsnprintf_l(char * __restrict str, size_t n, locale_t locale,
52 const char * __restrict fmt, __va_list ap)
53 {
54 size_t on;
55 int ret;
56 char dummy[2];
57 FILE f = FAKE_FILE;
58 FIX_LOCALE(locale);
59
60 on = n;
61 if (n != 0)
62 n--;
63 if (n > INT_MAX) {
64 errno = EOVERFLOW;
65 *str = '\0';
66 return (EOF);
67 }
68 /* Stdio internals do not deal correctly with zero length buffer */
69 if (n == 0) {
70 if (on > 0)
71 *str = '\0';
72 str = dummy;
73 n = 1;
74 }
75 f._flags = __SWR | __SSTR;
76 f._bf._base = f._p = (unsigned char *)str;
77 f._bf._size = f._w = n;
78 ret = __vfprintf(&f, locale, fmt, ap);
79 if (on > 0)
80 *f._p = '\0';
81 return (ret);
82 }
83 int
vsnprintf(char * __restrict str,size_t n,const char * __restrict fmt,__va_list ap)84 vsnprintf(char * __restrict str, size_t n, const char * __restrict fmt,
85 __va_list ap)
86 {
87 return vsnprintf_l(str, n, __get_locale(), fmt, ap);
88 }
89