1 /* $NetBSD: dprintf.c,v 1.1.1.3 2023/08/18 18:36:49 christos Exp $ */
2
3 /*
4 * Copyright (c) Ian F. Darwin 1986-1995.
5 * Software written by Ian F. Darwin and others;
6 * maintained 1995-present by Christos Zoulas and others.
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 immediately at the beginning of the file, without modification,
13 * this list of conditions, and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
22 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * SUCH DAMAGE.
29 */
30 #include "file.h"
31
32 #ifndef lint
33 #if 0
34 FILE_RCSID("@(#)$File: dprintf.c,v 1.4 2022/09/24 20:30:13 christos Exp $")
35 #else
36 __RCSID("$NetBSD: dprintf.c,v 1.1.1.3 2023/08/18 18:36:49 christos Exp $");
37 #endif
38 #endif /* lint */
39
40 #include <assert.h>
41 #include <unistd.h>
42 #include <stdio.h>
43 #include <stdarg.h>
44
45 int
dprintf(int fd,const char * fmt,...)46 dprintf(int fd, const char *fmt, ...)
47 {
48 va_list ap;
49 /* Simpler than using vasprintf() here, since we never need more */
50 char buf[1024];
51 int len;
52
53 va_start(ap, fmt);
54 len = vsnprintf(buf, sizeof(buf), fmt, ap);
55 va_end(ap);
56
57 if ((size_t)len >= sizeof(buf))
58 return -1;
59
60 if (write(fd, buf, (size_t)len) != len)
61 return -1;
62
63 return len;
64 }
65