1 /* vsnprintf.c
2 *
3 * $Id: vsnprintf.c,v 1.3 2008/07/28 23:24:20 keithmarshall Exp $
4 *
5 * Provides an implementation of the "vsnprintf" function, conforming
6 * generally to C99 and SUSv3/POSIX specifications, with extensions
7 * to support Microsoft's non-standard format specifications. This
8 * is included in libmingwex.a, replacing the redirection through
9 * libmoldnames.a, to the MSVCRT standard "_vsnprintf" function; (the
10 * standard MSVCRT function remains available, and may be invoked
11 * directly, using this fully qualified form of its name).
12 *
13 * Written by Keith Marshall <keithmarshall@users.sourceforge.net>
14 *
15 * This is free software. You may redistribute and/or modify it as you
16 * see fit, without restriction of copyright.
17 *
18 * This software is provided "as is", in the hope that it may be useful,
19 * but WITHOUT WARRANTY OF ANY KIND, not even any implied warranty of
20 * MERCHANTABILITY, nor of FITNESS FOR ANY PARTICULAR PURPOSE. At no
21 * time will the author accept any form of liability for any damages,
22 * however caused, resulting from the use of this software.
23 *
24 */
25
26 #include <stdio.h>
27 #include <stdarg.h>
28
29 #include "mingw_pformat.h"
30
31 int __cdecl __vsnprintf (APICHAR *, size_t, const APICHAR *fmt, va_list) __MINGW_NOTHROW;
__vsnprintf(APICHAR * buf,size_t length,const APICHAR * fmt,va_list argv)32 int __cdecl __vsnprintf(APICHAR *buf, size_t length, const APICHAR *fmt, va_list argv )
33 {
34 register int retval;
35
36 if( length == (size_t)(0) )
37 /*
38 * No buffer; simply compute and return the size required,
39 * without actually emitting any data.
40 */
41 return __pformat( 0, buf, 0, fmt, argv);
42
43 /* If we get to here, then we have a buffer...
44 * Emit data up to the limit of buffer length less one,
45 * then add the requisite NUL terminator.
46 */
47 retval = __pformat( 0, buf, --length, fmt, argv );
48 buf[retval < (int) length ? retval : (int)length] = '\0';
49
50 return retval;
51 }
52
53