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      1 /*	$NetBSD: eprintf.c,v 1.3 2025/11/19 09:43:27 nia 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. The name of the author may not be used to endorse or promote products
     16  *    derived from this software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     19  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     20  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     21  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     22  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     23  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     24  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     25  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     26  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     27  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     28  */
     29 
     30 #include <fcntl.h>
     31 #include <errno.h>
     32 #include <stdio.h>
     33 #include <stdarg.h>
     34 #include <unistd.h>
     35 #include "libtos.h"
     36 
     37 static int	output_redirected = 0;
     38 
     39 void
     40 redirect_output(char *fn)
     41 {
     42 	int	fd;
     43 
     44 	fd = creat(fn, 0666);
     45 	if (fd < 0 || dup2(fd, STDOUT_FILENO) < 0)
     46 		fatal(errno, "%s", fn);
     47 	output_redirected = 1;
     48 }
     49 
     50 /*
     51  * Print output to stderr. When output is redirected,
     52  * also write it to stdout.
     53  */
     54 int
     55 eprintf(char *frm)
     56 {
     57 	va_list	args;
     58 	int	rv;
     59 
     60 	va_start(args, frm);
     61 	rv = veprintf(frm, args);
     62 	va_end(args);
     63 	return(rv);
     64 }
     65 
     66 int
     67 veprintf(char *frm, va_list args)
     68 {
     69 	int	rv;
     70 
     71 	rv = vfprintf(stderr, frm, args);
     72 	if (output_redirected)
     73 		vfprintf(stdout, frm, args);
     74 	return(rv);
     75 }
     76