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
34FILE_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
45int
46dprintf(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