/*      $NetBSD: eprintf.c,v 1.2 2009/03/14 15:36:04 dsl Exp $  */

/*
* Copyright (c) 1995 Waldi Ravens.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
*    must display the following acknowledgement:
*        This product includes software developed by Waldi Ravens.
* 4. The name of the author may not be used to endorse or promote products
*    derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

#include <fcntl.h>
#include <errno.h>
#include <stdio.h>
#include <stdarg.h>
#include <unistd.h>
#include "libtos.h"

static int      output_redirected = 0;

void
redirect_output(char *fn)
{
       int     fd;

       fd = creat(fn, 0666);
       if (fd < 0 || dup2(fd, STDOUT_FILENO) < 0)
               fatal(errno, "%s", fn);
       output_redirected = 1;
}

/*
* Print output to stderr. When output is redirected,
* also write it to stdout.
*/
int
eprintf(char *frm)
{
       va_list args;
       int     rv;

       va_start(args, frm);
       rv = veprintf(frm, args);
       va_end(args);
       return(rv);
}

int
veprintf(char *frm, va_list args)
{
       int     rv;

       rv = vfprintf(stderr, frm, args);
       if (output_redirected)
               vfprintf(stdout, frm, args);
       return(rv);
}