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 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 4. Neither the name of the University nor the names of its contributors
17 *    may be used to endorse or promote products derived from this software
18 *    without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33#if defined(LIBC_SCCS) && !defined(lint)
34static char sccsid[] = "@(#)vsnprintf.c	8.1 (Berkeley) 6/4/93";
35#endif /* LIBC_SCCS and not lint */
36#include <sys/cdefs.h>
37__FBSDID("$FreeBSD: src/lib/libc/stdio/vsnprintf.c,v 1.24 2008/04/17 22:17:54 jhb Exp $");
38
39#include "xlocale_private.h"
40
41#include <limits.h>
42#include <stdio.h>
43#include "local.h"
44
45__private_extern__ int
46_vsnprintf(printf_comp_t __restrict pc, printf_domain_t __restrict domain, char * __restrict str, size_t n, locale_t __restrict loc, const char * __restrict fmt, __va_list ap)
47{
48	size_t on;
49	int ret;
50	char dummy[2];
51	FILE f;
52	struct __sFILEX ext;
53	f._extra = &ext;
54	INITEXTRA(&f);
55
56	on = n;
57	if (n != 0)
58		n--;
59	if (n > INT_MAX)
60		n = INT_MAX;
61	/* Stdio internals do not deal correctly with zero length buffer */
62	if (n == 0) {
63		if (on > 0)
64	  		*str = '\0';
65		str = dummy;
66		n = 1;
67	}
68	f._file = -1;
69	f._flags = __SWR | __SSTR;
70	f._bf._base = f._p = (unsigned char *)str;
71	f._bf._size = f._w = n;
72	f._orientation = 0;
73	memset(&f._mbstate, 0, sizeof(mbstate_t));
74	ret = __v2printf(pc, domain, &f, loc, fmt, ap);
75	if (on > 0)
76		*f._p = '\0';
77	return (ret);
78}
79int
80vsnprintf_l(char * __restrict str, size_t n, locale_t __restrict loc, const char * __restrict fmt,
81    __va_list ap)
82{
83	return _vsnprintf(XPRINTF_PLAIN, NULL, str, n, loc, fmt, ap);
84}
85
86int
87vsnprintf(char * __restrict str, size_t n, const char * __restrict fmt,
88    __va_list ap)
89{
90	return _vsnprintf(XPRINTF_PLAIN, NULL, str, n, __current_locale(), fmt, ap);
91}
92