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