1 /*
2  * The authors of this software are Rob Pike and Ken Thompson.
3  *              Copyright (c) 2002 by Lucent Technologies.
4  * Permission to use, copy, modify, and distribute this software for any
5  * purpose without fee is hereby granted, provided that this entire notice
6  * is included in all copies of any software which is or includes a copy
7  * or modification of this software and in all copies of the supporting
8  * documentation for such software.
9  * THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR IMPLIED
10  * WARRANTY.  IN PARTICULAR, NEITHER THE AUTHORS NOR LUCENT TECHNOLOGIES MAKE
11  * ANY REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE MERCHANTABILITY
12  * OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR PURPOSE.
13  */
14 #include <stdlib.h>
15 #include <stdarg.h>
16 #include "plan9.h"
17 #include "fmt.h"
18 #include "fmtdef.h"
19 
20 int
21 vsnprint(char *buf, int len, char *fmt, va_list args)
22 {
23 	Fmt f;
24 
25 	if(len <= 0)
26 		return -1;
27 	f.runes = 0;
28 	f.start = buf;
29 	f.to = buf;
30 	f.stop = buf + len - 1;
31 	f.flush = 0;
32 	f.farg = nil;
33 	f.nfmt = 0;
34 	VA_COPY(f.args,args);
35 	dofmt(&f, fmt);
36 	VA_END(f.args);
37 	*(char*)f.to = '\0';
38 	return (char*)f.to - buf;
39 }