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 * Copyright (c) 2011 The FreeBSD Foundation
8 * All rights reserved.
9 * Portions of this software were developed by David Chisnall
10 * under sponsorship from the FreeBSD Foundation.
11 *
12 * This code is derived from software contributed to Berkeley by
13 * Chris Torek.
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 #if defined(LIBC_SCCS) && !defined(lint)
41 static char sccsid[] = "@(#)snprintf.c 8.1 (Berkeley) 6/4/93";
42 #endif /* LIBC_SCCS and not lint */
43 #include <sys/cdefs.h>
44 __FBSDID("$FreeBSD$");
45
46 #include <errno.h>
47 #include <limits.h>
48 #include <stdio.h>
49 #include <stdarg.h>
50 #include "xlocale_private.h"
51
52 #include "local.h"
53
54 int
snprintf(char * __restrict str,size_t n,char const * __restrict fmt,...)55 snprintf(char * __restrict str, size_t n, char const * __restrict fmt, ...)
56 {
57 size_t on;
58 int ret;
59 va_list ap;
60 FILE f = FAKE_FILE;
61
62 on = n;
63 if (n != 0)
64 n--;
65 if (n > INT_MAX) {
66 errno = EOVERFLOW;
67 *str = '\0';
68 return (EOF);
69 }
70 va_start(ap, fmt);
71 f._flags = __SWR | __SSTR;
72 f._bf._base = f._p = (unsigned char *)str;
73 f._bf._size = f._w = n;
74 ret = __vfprintf(&f, __get_locale(), fmt, ap);
75 if (on > 0)
76 *f._p = '\0';
77 va_end(ap);
78 return (ret);
79 }
80 int
snprintf_l(char * __restrict str,size_t n,locale_t locale,char const * __restrict fmt,...)81 snprintf_l(char * __restrict str, size_t n, locale_t locale,
82 char const * __restrict fmt, ...)
83 {
84 size_t on;
85 int ret;
86 va_list ap;
87 FILE f = FAKE_FILE;
88 FIX_LOCALE(locale);
89
90 on = n;
91 if (n != 0)
92 n--;
93 if (n > INT_MAX) {
94 errno = EOVERFLOW;
95 *str = '\0';
96 return (EOF);
97 }
98 va_start(ap, fmt);
99 f._flags = __SWR | __SSTR;
100 f._bf._base = f._p = (unsigned char *)str;
101 f._bf._size = f._w = n;
102 ret = __vfprintf(&f, locale, fmt, ap);
103 if (on > 0)
104 *f._p = '\0';
105 va_end(ap);
106 return (ret);
107 }
108