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 ANY
11 * 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 "fmt.h"
17 #include "fmtdef.h"
18
19 int
vsnprint(char * buf,int len,char * fmt,va_list args)20 vsnprint(char *buf, int len, char *fmt, va_list args)
21 {
22 Fmt f;
23
24 if(len <= 0)
25 return -1;
26 f.runes = 0;
27 f.start = buf;
28 f.to = buf;
29 f.stop = buf + len - 1;
30 f.flush = 0;
31 f.farg = nil;
32 f.nfmt = 0;
33 f.args = args;
34 dofmt(&f, fmt);
35 *(char*)f.to = '\0';
36 return (char*)f.to - buf;
37 }
38