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 40 static int output_redirected = 0; 41 42 void 43 redirect_output(fn) 44 char *fn; 45 { 46 int fd; 47 48 fd = creat(fn, 0666); 49 if (fd < 0 || dup2(fd, STDOUT_FILENO) < 0) 50 fatal(errno, "%s", fn); 51 output_redirected = 1; 52 } 53 54 /* 55 * Print output to stderr. When output is redirected, 56 * also write it to stdout. 57 */ 58 int 59 eprintf(frm) 60 char *frm; 61 { 62 va_list args; 63 int rv; 64 65 va_start(args, frm); 66 rv = veprintf(frm, args); 67 va_end(args); 68 return(rv); 69 } 70 71 int 72 veprintf(frm, args) 73 char *frm; 74 va_list args; 75 { 76 int rv; 77 78 rv = vfprintf(stderr, frm, args); 79 if (output_redirected) 80 vfprintf(stdout, frm, args); 81 return(rv); 82 } 83