1/***********************************************************************
2*                                                                      *
3*               This software is part of the ast package               *
4*          Copyright (c) 1985-2011 AT&T Intellectual Property          *
5*                      and is licensed under the                       *
6*                 Eclipse Public License, Version 1.0                  *
7*                    by AT&T Intellectual Property                     *
8*                                                                      *
9*                A copy of the License is available at                 *
10*          http://www.eclipse.org/org/documents/epl-v10.html           *
11*         (with md5 checksum b35adb5213ca9657e911e9befb180842)         *
12*                                                                      *
13*              Information and Software Systems Research               *
14*                            AT&T Research                             *
15*                           Florham Park NJ                            *
16*                                                                      *
17*                 Glenn Fowler <gsf@research.att.com>                  *
18*                  David Korn <dgk@research.att.com>                   *
19*                   Phong Vo <kpv@research.att.com>                    *
20*                                                                      *
21***********************************************************************/
22#pragma prototyped
23
24#include "stdhdr.h"
25
26int
27vsnprintf(char* s, int n, const char* form, va_list args)
28{
29	Sfio_t*	f;
30	ssize_t	rv;
31
32	/* make a temp stream */
33	if(!(f = sfnew(NIL(Sfio_t*),NIL(char*),(size_t)SF_UNBOUND,
34                        -1,SF_WRITE|SF_STRING)) )
35		return -1;
36
37	if((rv = sfvprintf(f,form,args)) >= 0 )
38	{	if(s && n > 0)
39		{	if((rv+1) >= n)
40				n--;
41			else
42				n = rv;
43			memcpy(s, f->data, n);
44			s[n] = 0;
45		}
46		_Sfi = rv;
47	}
48
49	sfclose(f);
50
51	return rv;
52}
53