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tee.c revision 1.6 
      1 /*	$NetBSD: tee.c,v 1.6 1997/10/20 00:37:11 lukem Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1988, 1993
      5  *	The Regents of the University of California.  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 the University of
     18  *	California, Berkeley and its contributors.
     19  * 4. Neither the name of the University nor the names of its contributors
     20  *    may be used to endorse or promote products derived from this software
     21  *    without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     33  * SUCH DAMAGE.
     34  */
     35 
     36 #include <sys/cdefs.h>
     37 #ifndef lint
     38 __COPYRIGHT("@(#) Copyright (c) 1988, 1993\n\
     39 	The Regents of the University of California.  All rights reserved.\n");
     40 #endif /* not lint */
     41 
     42 #ifndef lint
     43 #if 0
     44 static char sccsid[] = "@(#)tee.c	8.1 (Berkeley) 6/6/93";
     45 #endif
     46 __RCSID("$NetBSD: tee.c,v 1.6 1997/10/20 00:37:11 lukem Exp $");
     47 #endif
     48 
     49 #include <sys/types.h>
     50 #include <sys/stat.h>
     51 #include <signal.h>
     52 #include <errno.h>
     53 #include <fcntl.h>
     54 #include <unistd.h>
     55 #include <stdio.h>
     56 #include <stdlib.h>
     57 #include <string.h>
     58 #include <locale.h>
     59 #include <err.h>
     60 
     61 typedef struct _list {
     62 	struct _list *next;
     63 	int fd;
     64 	char *name;
     65 } LIST;
     66 LIST *head;
     67 
     68 void	add __P((int, char *));
     69 int	main __P((int, char **));
     70 
     71 int
     72 main(argc, argv)
     73 	int argc;
     74 	char *argv[];
     75 {
     76 	LIST *p;
     77 	int n, fd, rval, wval;
     78 	char *bp;
     79 	int append, ch, exitval;
     80 	char *buf;
     81 #define	BSIZE (8 * 1024)
     82 
     83 	setlocale(LC_ALL, "");
     84 
     85 	append = 0;
     86 	while ((ch = getopt(argc, argv, "ai")) != -1)
     87 		switch((char)ch) {
     88 		case 'a':
     89 			append = 1;
     90 			break;
     91 		case 'i':
     92 			(void)signal(SIGINT, SIG_IGN);
     93 			break;
     94 		case '?':
     95 		default:
     96 			(void)fprintf(stderr, "usage: tee [-ai] [file ...]\n");
     97 			exit(1);
     98 		}
     99 	argv += optind;
    100 	argc -= optind;
    101 
    102 	if ((buf = malloc((size_t)BSIZE)) == NULL)
    103 		err(1, "malloc");
    104 
    105 	add(STDOUT_FILENO, "stdout");
    106 
    107 	for (exitval = 0; *argv; ++argv)
    108 		if ((fd = open(*argv, append ? O_WRONLY|O_CREAT|O_APPEND :
    109 		    O_WRONLY|O_CREAT|O_TRUNC, DEFFILEMODE)) < 0) {
    110 			warn("%s", *argv);
    111 			exitval = 1;
    112 		} else
    113 			add(fd, *argv);
    114 
    115 	while ((rval = read(STDIN_FILENO, buf, BSIZE)) > 0)
    116 		for (p = head; p; p = p->next) {
    117 			n = rval;
    118 			bp = buf;
    119 			do {
    120 				if ((wval = write(p->fd, bp, n)) == -1) {
    121 					warn("%s", p->name);
    122 					exitval = 1;
    123 					break;
    124 				}
    125 				bp += wval;
    126 			} while (n -= wval);
    127 		}
    128 	if (rval < 0) {
    129 		warn("read");
    130 		exitval = 1;
    131 	}
    132 
    133 	for (p = head; p; p = p->next) {
    134 		if (close(p->fd) == -1) {
    135 			warn("%s", p->name);
    136 			exitval = 1;
    137 		}
    138 	}
    139 
    140 	exit(exitval);
    141 }
    142 
    143 void
    144 add(fd, name)
    145 	int fd;
    146 	char *name;
    147 {
    148 	LIST *p;
    149 
    150 	if ((p = malloc((size_t)sizeof(LIST))) == NULL)
    151 		err(1, "malloc");
    152 	p->fd = fd;
    153 	p->name = name;
    154 	p->next = head;
    155 	head = p;
    156 }
    157