1/*	$OpenBSD: snprintf.c,v 1.7 2019/05/11 16:56:47 deraadt Exp $	*/
2/*	$NetBSD: printf.c,v 1.10 1996/11/30 04:19:21 gwr Exp $	*/
3
4/*-
5 * Copyright (c) 1993
6 *	The Regents of the University of California.  All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the University nor the names of its contributors
17 *    may be used to endorse or promote products derived from this software
18 *    without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 *
32 *	@(#)printf.c	8.1 (Berkeley) 6/11/93
33 */
34
35#include <sys/types.h>
36#include <sys/stdarg.h>
37
38#include "stand.h"
39
40extern void kprintn(void (*)(int), u_long, int);
41extern void kdoprnt(void (*)(int), const char *, va_list);
42
43static void sputchar(int);
44
45static char *sbuf, *sbuf_end;
46
47void
48sputchar(int c)
49{
50	if (sbuf < sbuf_end)
51		*sbuf = c;
52	sbuf++;
53}
54
55int
56snprintf(char *buf, size_t len, const char *fmt, ...)
57{
58	va_list ap;
59
60	sbuf = buf;
61	sbuf_end = sbuf + len;
62	va_start(ap, fmt);
63	kdoprnt(sputchar, fmt, ap);
64	va_end(ap);
65
66	if (sbuf < sbuf_end)
67		*sbuf = '\0';
68	else if (len > 0)
69		*(sbuf_end - 1) = '\0';
70
71	return sbuf - buf;
72}
73