xref: /libuv/src/win/snprintf.c (revision 764877fd)
1 /* Copyright the libuv project contributors. All rights reserved.
2  *
3  * Permission is hereby granted, free of charge, to any person obtaining a copy
4  * of this software and associated documentation files (the "Software"), to
5  * deal in the Software without restriction, including without limitation the
6  * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
7  * sell copies of the Software, and to permit persons to whom the Software is
8  * furnished to do so, subject to the following conditions:
9  *
10  * The above copyright notice and this permission notice shall be included in
11  * all copies or substantial portions of the Software.
12  *
13  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
14  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
15  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
16  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
17  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
18  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
19  * IN THE SOFTWARE.
20  */
21 
22 #if defined(_MSC_VER) && _MSC_VER < 1900
23 
24 #include <stdio.h>
25 #include <stdarg.h>
26 
27 /* Emulate snprintf() on MSVC<2015, _snprintf() doesn't zero-terminate the buffer
28  * on overflow...
29  */
snprintf(char * buf,size_t len,const char * fmt,...)30 int snprintf(char* buf, size_t len, const char* fmt, ...) {
31   int n;
32   va_list ap;
33   va_start(ap, fmt);
34 
35   n = _vscprintf(fmt, ap);
36   vsnprintf_s(buf, len, _TRUNCATE, fmt, ap);
37 
38   va_end(ap);
39   return n;
40 }
41 
42 #endif
43