1 /* $NetBSD: vsnprintf.c,v 1.20 2005/02/09 21:35:47 kleink 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 #include <LibConfig.h>
35 #include <sys/EfiCdefs.h>
36 #if defined(LIBC_SCCS) && !defined(lint)
37 #if 0
38 static char sccsid[] = "@(#)vsnprintf.c 8.1 (Berkeley) 6/4/93";
39 #else
40 __RCSID("$NetBSD: vsnprintf.c,v 1.20 2005/02/09 21:35:47 kleink 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 <stdio.h>
49 #include "reentrant.h"
50 #include "local.h"
51
52 #ifdef __weak_alias
__weak_alias(vsnprintf,_vsnprintf)53 __weak_alias(vsnprintf,_vsnprintf)
54 #endif
55
56 int
57 vsnprintf(char *str, size_t n, const char *fmt, va_list ap)
58 {
59 int ret;
60 FILE f;
61 struct __sfileext fext;
62 unsigned char dummy[1];
63
64 _DIAGASSERT(n == 0 || str != NULL);
65 _DIAGASSERT(fmt != NULL);
66
67 if ((int)n < 0) {
68 errno = EINVAL;
69 return (-1);
70 }
71
72 _FILEEXT_SETUP(&f, &fext);
73 f._file = -1;
74 f._flags = __SWR | __SSTR;
75 if (n == 0) {
76 f._bf._base = f._p = dummy;
77 f._bf._size = f._w = 0;
78 } else {
79 f._bf._base = f._p = (unsigned char *)str;
80 f._bf._size = f._w = (int)(n - 1);
81 }
82 ret = __vfprintf_unlocked(&f, fmt, ap);
83 *f._p = 0;
84 return (ret);
85 }
86