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
26 int
vsnprintf(char * s,int n,const char * form,va_list args)27 vsnprintf(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