1/*	$NetBSD: eprintf.c,v 1.1.1.1 1996/01/07 21:50:49 leo Exp $	*/
2
3/*
4 * Copyright (c) 1995 Waldi Ravens.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. All advertising materials mentioning features or use of this software
16 *    must display the following acknowledgement:
17 *        This product includes software developed by Waldi Ravens.
18 * 4. The name of the author may not be used to endorse or promote products
19 *    derived from this software without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
22 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
23 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
24 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
26 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
30 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31 */
32
33#include <fcntl.h>
34#include <errno.h>
35#include <stdio.h>
36#include <stdarg.h>
37#include <unistd.h>
38#include "libtos.h"
39
40static int	output_redirected = 0;
41
42void
43redirect_output(char *fn)
44{
45	int	fd;
46
47	fd = creat(fn, 0666);
48	if (fd < 0 || dup2(fd, STDOUT_FILENO) < 0)
49		fatal(errno, "%s", fn);
50	output_redirected = 1;
51}
52
53/*
54 * Print output to stderr. When output is redirected,
55 * also write it to stdout.
56 */
57int
58eprintf(char *frm)
59{
60	va_list	args;
61	int	rv;
62
63	va_start(args, frm);
64	rv = veprintf(frm, args);
65	va_end(args);
66	return(rv);
67}
68
69int
70veprintf(char *frm, va_list args)
71{
72	int	rv;
73
74	rv = vfprintf(stderr, frm, args);
75	if (output_redirected)
76		vfprintf(stdout, frm, args);
77	return(rv);
78}
79