xref: /plan9/sys/src/ape/lib/fmt/vsnprint.c (revision 40ef9009116dd37656783aaadc8782c1d8bfb056)
1*40ef9009SDavid du Colombier /*
2*40ef9009SDavid du Colombier  * The authors of this software are Rob Pike and Ken Thompson.
3*40ef9009SDavid du Colombier  *              Copyright (c) 2002 by Lucent Technologies.
4*40ef9009SDavid du Colombier  * Permission to use, copy, modify, and distribute this software for any
5*40ef9009SDavid du Colombier  * purpose without fee is hereby granted, provided that this entire notice
6*40ef9009SDavid du Colombier  * is included in all copies of any software which is or includes a copy
7*40ef9009SDavid du Colombier  * or modification of this software and in all copies of the supporting
8*40ef9009SDavid du Colombier  * documentation for such software.
9*40ef9009SDavid du Colombier  * THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR IMPLIED
10*40ef9009SDavid du Colombier  * WARRANTY.  IN PARTICULAR, NEITHER THE AUTHORS NOR LUCENT TECHNOLOGIES MAKE ANY
11*40ef9009SDavid du Colombier  * REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE MERCHANTABILITY
12*40ef9009SDavid du Colombier  * OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR PURPOSE.
13*40ef9009SDavid du Colombier  */
14*40ef9009SDavid du Colombier #include <stdlib.h>
15*40ef9009SDavid du Colombier #include <stdarg.h>
16*40ef9009SDavid du Colombier #include "fmt.h"
17*40ef9009SDavid du Colombier #include "fmtdef.h"
18*40ef9009SDavid du Colombier 
19*40ef9009SDavid du Colombier int
vsnprint(char * buf,int len,char * fmt,va_list args)20*40ef9009SDavid du Colombier vsnprint(char *buf, int len, char *fmt, va_list args)
21*40ef9009SDavid du Colombier {
22*40ef9009SDavid du Colombier 	Fmt f;
23*40ef9009SDavid du Colombier 
24*40ef9009SDavid du Colombier 	if(len <= 0)
25*40ef9009SDavid du Colombier 		return -1;
26*40ef9009SDavid du Colombier 	f.runes = 0;
27*40ef9009SDavid du Colombier 	f.start = buf;
28*40ef9009SDavid du Colombier 	f.to = buf;
29*40ef9009SDavid du Colombier 	f.stop = buf + len - 1;
30*40ef9009SDavid du Colombier 	f.flush = 0;
31*40ef9009SDavid du Colombier 	f.farg = nil;
32*40ef9009SDavid du Colombier 	f.nfmt = 0;
33*40ef9009SDavid du Colombier 	f.args = args;
34*40ef9009SDavid du Colombier 	dofmt(&f, fmt);
35*40ef9009SDavid du Colombier 	*(char*)f.to = '\0';
36*40ef9009SDavid du Colombier 	return (char*)f.to - buf;
37*40ef9009SDavid du Colombier }
38