1 /* Copyright (c) 2003, Joerg Wunsch
2 All rights reserved.
3
4 Redistribution and use in source and binary forms, with or without
5 modification, are permitted provided that the following conditions are met:
6
7 * Redistributions of source code must retain the above copyright
8 notice, this list of conditions and the following disclaimer.
9 * Redistributions in binary form must reproduce the above copyright
10 notice, this list of conditions and the following disclaimer in
11 the documentation and/or other materials provided with the
12 distribution.
13 * Neither the name of the copyright holders nor the names of
14 contributors may be used to endorse or promote products derived
15 from this software without specific prior written permission.
16
17 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
18 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
21 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
22 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
23 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
24 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
25 CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
26 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
27 POSSIBILITY OF SUCH DAMAGE.
28 */
29
30 /* $Id: vsnprintf.c 1944 2009-04-01 23:12:20Z arcanum $ */
31
32 #include "stdio_private.h"
33
34 int
vsnprintf(char * s,size_t n,const char * fmt,va_list ap)35 vsnprintf(char *s, size_t n, const char *fmt, va_list ap)
36 {
37 int i;
38
39 /* Restrict max output length to INT_MAX, as snprintf() return
40 signed int. The fputc() function uses a signed comparison
41 between estimated len and f.size field. So we can write a
42 negative value into f.size in the case of n was 0. Note,
43 that f.size will be a max number of nonzero symbols. */
44
45 if ((int) n < 0)
46 n = (unsigned)INT_MAX + 1;
47
48 struct __file_str f = FDEV_SETUP_STRING_WRITE(s, n ? n - 1 : 0);
49
50 i = vfprintf(&f.file, fmt, ap);
51
52 if (n)
53 *f.pos = '\0';
54
55 return i;
56 }
57
58 #ifdef __LONG_DOUBLE_IEEE128__
59 #if defined(_HAVE_ALIAS_ATTRIBUTE)
60 #ifndef __clang__
61 #pragma GCC diagnostic ignored "-Wmissing-attributes"
62 #endif
63 __strong_reference(vsnprintf, __vsnprintfieee128);
64 #endif
65 #endif
66
