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
38 static 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
59 int snprintf(char * __restrict, size_t, const char * __restrict, ...)
60 __printflike(3, 4);
61 int vsnprintf(char * __restrict, size_t, const char * __restrict,
62 __va_list) __printflike(3, 0);
63 #endif
64
65 #ifdef __weak_alias
__weak_alias(vsnprintf,_vsnprintf)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
72 int
73 vsnprintf_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
104 int
vsnprintf(char * str,size_t n,const char * fmt,va_list ap)105 vsnprintf(char *str, size_t n, const char *fmt, va_list ap)
106 {
107 return vsnprintf_l(str, n, _current_locale(), fmt, ap);
108 }
109
110 int
snprintf(char * str,size_t n,const char * fmt,...)111 snprintf(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
122 int
snprintf_l(char * str,size_t n,locale_t loc,const char * fmt,...)123 snprintf_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