/*******************************************************************
*                                                                  *
*             This software is part of the ast package             *
*                Copyright (c) 1985-2004 AT&T Corp.                *
*        and it may only be used by you under license from         *
*                       AT&T Corp. ("AT&T")                        *
*         A copy of the Source Code Agreement is available         *
*                at the AT&T Internet web site URL                 *
*                                                                  *
*       http://www.research.att.com/sw/license/ast-open.html       *
*                                                                  *
*    If you have copied or used this software without agreeing     *
*        to the terms of the license you are infringing on         *
*           the license and copyright and are violating            *
*               AT&T's intellectual property rights.               *
*                                                                  *
*            Information and Software Systems Research             *
*                        AT&T Labs Research                        *
*                         Florham Park NJ                          *
*                                                                  *
*               Glenn Fowler <gsf@research.att.com>                *
*                David Korn <dgk@research.att.com>                 *
*                 Phong Vo <kpv@research.att.com>                  *
*                                                                  *
*******************************************************************/
#pragma prototyped

#include "stdhdr.h"

int
vsnprintf(char* s, int n, const char* fmt, va_list args)
{
	Sfio_t	f;
	int	v;

	if (!s)
		return -1;

	/*
	 * make a fake stream
	 */

	SFCLEAR(&f, NiL);
	f.flags = SF_STRING|SF_WRITE;
	f.bits = SF_PRIVATE;
	f.mode = SF_WRITE;
	f.size = n - 1;
	f.data = f.next = f.endr = (uchar*)s;
	f.endb = f.endw = f.data + f.size;

	/*
	 * call and fix up
	 */

	v = sfvprintf(&f, fmt, args);
	*f.next = 0;
	_Sfi = f.next - f.data;
	return v;
}
