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/* vsnprintf.c
*
* $Id: vsnprintf.c,v 1.3 2008/07/28 23:24:20 keithmarshall Exp $
*
* Provides an implementation of the "vsnprintf" function, conforming
* generally to C99 and SUSv3/POSIX specifications, with extensions
* to support Microsoft's non-standard format specifications. This
* is included in libmingwex.a, replacing the redirection through
* libmoldnames.a, to the MSVCRT standard "_vsnprintf" function; (the
* standard MSVCRT function remains available, and may be invoked
* directly, using this fully qualified form of its name).
*
* Written by Keith Marshall <keithmarshall@users.sourceforge.net>
*
* This is free software. You may redistribute and/or modify it as you
* see fit, without restriction of copyright.
*
* This software is provided "as is", in the hope that it may be useful,
* but WITHOUT WARRANTY OF ANY KIND, not even any implied warranty of
* MERCHANTABILITY, nor of FITNESS FOR ANY PARTICULAR PURPOSE. At no
* time will the author accept any form of liability for any damages,
* however caused, resulting from the use of this software.
*
*/
#include <stdio.h>
#include <stdarg.h>
#include "mingw_pformat.h"
int __cdecl __vsnprintf (APICHAR *, size_t, const APICHAR *fmt, va_list) __MINGW_NOTHROW;
int __cdecl __vsnprintf(APICHAR *buf, size_t length, const APICHAR *fmt, va_list argv )
{
register int retval;
if( length == (size_t)(0) )
{
#if defined(__BUILD_WIDEAPI) && defined(__BUILD_WIDEAPI_ISO)
/* No buffer; for wide api ISO C95+ vswprintf() function
* simply returns negative value as required by ISO C95+.
*/
return -1;
#else
/*
* No buffer; simply compute and return the size required,
* without actually emitting any data.
*/
return __pformat( 0, buf, 0, fmt, argv);
#endif
}
/* If we get to here, then we have a buffer...
* Emit data up to the limit of buffer length less one,
* then add the requisite NUL terminator.
*/
retval = __pformat( 0, buf, --length, fmt, argv );
buf[retval < (int) length ? retval : (int)length] = '\0';
#if defined(__BUILD_WIDEAPI) && defined(__BUILD_WIDEAPI_ISO)
/* For wide api ISO C95+ vswprintf() when requested length
* is equal or larger than buffer length, returns negative
* value as required by ISO C95+.
*/
if( retval >= (int) length )
retval = -1;
#endif
return retval;
}
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