1/*	$NetBSD: vsnprintf.c,v 1.29 2017/01/12 18:16:52 christos Exp $	*/
2
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 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the University nor the names of its contributors
19 *    may be used to endorse or promote products derived from this software
20 *    without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34
35#include <sys/cdefs.h>
36#if defined(LIBC_SCCS) && !defined(lint)
37#if 0
38static char sccsid[] = "@(#)vsnprintf.c	8.1 (Berkeley) 6/4/93";
39#else
40__RCSID("$NetBSD: vsnprintf.c,v 1.29 2017/01/12 18:16:52 christos Exp $");
41#endif
42#endif /* LIBC_SCCS and not lint */
43
44#include "namespace.h"
45
46#include <assert.h>
47#include <errno.h>
48#include <locale.h>
49#include <stdio.h>
50#include "reentrant.h"
51#include "setlocale_local.h"
52#include "local.h"
53
54#if __SSP_FORTIFY_LEVEL != 0
55# undef vsnprintf
56# define vsnprintf _vsnprintf
57# undef snprintf
58# define snprintf _snprintf
59int      snprintf(char * __restrict, size_t, const char * __restrict, ...)
60    __printflike(3, 4);
61int      vsnprintf(char * __restrict, size_t, const char * __restrict,
62    __va_list) __printflike(3, 0);
63#endif
64
65#ifdef __weak_alias
66__weak_alias(vsnprintf,_vsnprintf)
67__weak_alias(vsnprintf_l,_vsnprintf_l)
68__weak_alias(snprintf,_snprintf)
69__weak_alias(snprintf_l,_snprintf_l)
70#endif
71
72int
73vsnprintf_l(char *str, size_t n, locale_t loc, const char *fmt, va_list ap)
74{
75	int ret;
76	FILE f;
77	struct __sfileext fext;
78	unsigned char dummy[1];
79
80	_DIAGASSERT(n == 0 || str != NULL);
81	_DIAGASSERT(fmt != NULL);
82
83	if (n > INT_MAX) {
84		errno = EOVERFLOW;
85		return -1;
86	}
87
88	_FILEEXT_SETUP(&f, &fext);
89	f._file = -1;
90	f._flags = __SWR | __SSTR;
91	if (n == 0) {
92		f._bf._base = f._p = dummy;
93		f._bf._size = f._w = 0;
94	} else {
95		f._bf._base = f._p = (unsigned char *)str;
96		_DIAGASSERT(__type_fit(int, n - 1));
97		f._bf._size = f._w = (int)(n - 1);
98	}
99	ret = __vfprintf_unlocked_l(&f, loc, fmt, ap);
100	*f._p = 0;
101	return ret;
102}
103
104int
105vsnprintf(char *str, size_t n, const char *fmt, va_list ap)
106{
107	return vsnprintf_l(str, n, _current_locale(), fmt, ap);
108}
109
110int
111snprintf(char *str, size_t n, const char *fmt, ...)
112{
113	va_list ap;
114	int ret;
115
116	va_start(ap, fmt);
117	ret = vsnprintf(str, n, fmt, ap);
118	va_end(ap);
119	return ret;
120}
121
122int
123snprintf_l(char *str, size_t n, locale_t loc, const char *fmt, ...)
124{
125	va_list ap;
126	int ret;
127
128	va_start(ap, fmt);
129	ret = vsnprintf_l(str, n, loc, fmt, ap);
130	va_end(ap);
131	return ret;
132}
133