1 /* $NetBSD: eprintf.c,v 1.2 2009/03/14 15:36:04 dsl 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
40 static int output_redirected = 0;
41
42 void
redirect_output(char * fn)43 redirect_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 */
57 int
eprintf(char * frm)58 eprintf(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
69 int
veprintf(char * frm,va_list args)70 veprintf(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