1 /*-
2 * Copyright (c) 1990 The Regents of the University of California.
3 * All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * Chris Torek.
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. All advertising materials mentioning features or use of this software
17 * must display the following acknowledgement:
18 * This product includes software developed by the University of
19 * California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 */
36
37 #if defined(LIBC_SCCS) && !defined(lint)
38 static char sccsid[] = "@(#)snprintf.c 5.1 (Berkeley) 1/20/91";
39 #endif /* LIBC_SCCS and not lint */
40
41 #include <stdio.h>
42 #if __STDC__
43 #include <stdarg.h>
44 #else
45 #include <varargs.h>
46 #endif
47
48 #if __STDC__
snprintf(char * str,size_t n,char const * fmt,...)49 snprintf(char *str, size_t n, char const *fmt, ...)
50 #else
51 snprintf(str, n, fmt, va_alist)
52 char *str;
53 size_t n;
54 char *fmt;
55 va_dcl
56 #endif
57 {
58 int ret;
59 va_list ap;
60 FILE f;
61
62 if ((int)n < 1)
63 return (EOF);
64 #if __STDC__
65 va_start(ap, fmt);
66 #else
67 va_start(ap);
68 #endif
69 f._flags = __SWR | __SSTR;
70 f._bf._base = f._p = (unsigned char *)str;
71 f._bf._size = f._w = n - 1;
72 ret = vfprintf(&f, fmt, ap);
73 *f._p = 0;
74 va_end(ap);
75 return (ret);
76 }
77