1 /* $NetBSD: vsnprintf.c,v 1.28 2014/09/29 14:58:33 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
38 static char sccsid[] = "@(#)vsnprintf.c 8.1 (Berkeley) 6/4/93";
39 #else
40 __RCSID("$NetBSD: vsnprintf.c,v 1.28 2014/09/29 14:58:33 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 defined(_FORTIFY_SOURCE) && !defined(__lint__)
55 #undef vsnprintf
56 #define vsnprintf _vsnprintf
57 #undef snprintf
58 #define snprintf _snprintf
59 #endif
60
61 #ifdef __weak_alias
__weak_alias(vsnprintf,_vsnprintf)62 __weak_alias(vsnprintf,_vsnprintf)
63 __weak_alias(vsnprintf_l,_vsnprintf_l)
64 __weak_alias(snprintf,_snprintf)
65 __weak_alias(snprintf_l,_snprintf_l)
66 #endif
67
68 int
69 vsnprintf_l(char *str, size_t n, locale_t loc, const char *fmt, va_list ap)
70 {
71 int ret;
72 FILE f;
73 struct __sfileext fext;
74 unsigned char dummy[1];
75
76 _DIAGASSERT(n == 0 || str != NULL);
77 _DIAGASSERT(fmt != NULL);
78
79 if (n > INT_MAX) {
80 errno = EOVERFLOW;
81 return -1;
82 }
83
84 _FILEEXT_SETUP(&f, &fext);
85 f._file = -1;
86 f._flags = __SWR | __SSTR;
87 if (n == 0) {
88 f._bf._base = f._p = dummy;
89 f._bf._size = f._w = 0;
90 } else {
91 f._bf._base = f._p = (unsigned char *)str;
92 _DIAGASSERT(__type_fit(int, n - 1));
93 f._bf._size = f._w = (int)(n - 1);
94 }
95 ret = __vfprintf_unlocked_l(&f, loc, fmt, ap);
96 *f._p = 0;
97 return ret;
98 }
99
100 int
vsnprintf(char * str,size_t n,const char * fmt,va_list ap)101 vsnprintf(char *str, size_t n, const char *fmt, va_list ap)
102 {
103 return vsnprintf_l(str, n, _current_locale(), fmt, ap);
104 }
105
106 int
snprintf(char * str,size_t n,const char * fmt,...)107 snprintf(char *str, size_t n, const char *fmt, ...)
108 {
109 va_list ap;
110 int ret;
111
112 va_start(ap, fmt);
113 ret = vsnprintf(str, n, fmt, ap);
114 va_end(ap);
115 return ret;
116 }
117
118 int
snprintf_l(char * str,size_t n,locale_t loc,const char * fmt,...)119 snprintf_l(char *str, size_t n, locale_t loc, const char *fmt, ...)
120 {
121 va_list ap;
122 int ret;
123
124 va_start(ap, fmt);
125 ret = vsnprintf_l(str, n, loc, fmt, ap);
126 va_end(ap);
127 return ret;
128 }
129