83 lines
2.4 KiB
C
83 lines
2.4 KiB
C
/* $NetBSD: eprintf.c,v 1.1.1.1 1996/01/07 21:50:49 leo Exp $ */
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/*
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* Copyright (c) 1995 Waldi Ravens.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Waldi Ravens.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <fcntl.h>
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#include <errno.h>
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#include <stdio.h>
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#include <stdarg.h>
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#include <unistd.h>
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#include "libtos.h"
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static int output_redirected = 0;
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void
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redirect_output(fn)
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char *fn;
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{
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int fd;
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fd = creat(fn, 0666);
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if (fd < 0 || dup2(fd, STDOUT_FILENO) < 0)
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fatal(errno, "%s", fn);
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output_redirected = 1;
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}
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/*
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* Print output to stderr. When output is redirected,
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* also write it to stdout.
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*/
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int
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eprintf(frm)
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char *frm;
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{
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va_list args;
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int rv;
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va_start(args, frm);
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rv = veprintf(frm, args);
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va_end(args);
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return(rv);
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}
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int
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veprintf(frm, args)
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char *frm;
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va_list args;
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{
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int rv;
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rv = vfprintf(stderr, frm, args);
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if (output_redirected)
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vfprintf(stdout, frm, args);
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return(rv);
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}
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