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tee.c revision 1.7 
      1 /*	$NetBSD: tee.c,v 1.7 2003/08/07 11:16:07 agc 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. Neither the name of the University nor the names of its contributors
     16  *    may be used to endorse or promote products derived from this software
     17  *    without specific prior written permission.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     29  * SUCH DAMAGE.
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 #ifndef lint
     34 __COPYRIGHT("@(#) Copyright (c) 1988, 1993\n\
     35 	The Regents of the University of California.  All rights reserved.\n");
     36 #endif /* not lint */
     37 
     38 #ifndef lint
     39 #if 0
     40 static char sccsid[] = "@(#)tee.c	8.1 (Berkeley) 6/6/93";
     41 #endif
     42 __RCSID("$NetBSD: tee.c,v 1.7 2003/08/07 11:16:07 agc Exp $");
     43 #endif
     44 
     45 #include <sys/types.h>
     46 #include <sys/stat.h>
     47 #include <signal.h>
     48 #include <errno.h>
     49 #include <fcntl.h>
     50 #include <unistd.h>
     51 #include <stdio.h>
     52 #include <stdlib.h>
     53 #include <string.h>
     54 #include <locale.h>
     55 #include <err.h>
     56 
     57 typedef struct _list {
     58 	struct _list *next;
     59 	int fd;
     60 	char *name;
     61 } LIST;
     62 LIST *head;
     63 
     64 void	add __P((int, char *));
     65 int	main __P((int, char **));
     66 
     67 int
     68 main(argc, argv)
     69 	int argc;
     70 	char *argv[];
     71 {
     72 	LIST *p;
     73 	int n, fd, rval, wval;
     74 	char *bp;
     75 	int append, ch, exitval;
     76 	char *buf;
     77 #define	BSIZE (8 * 1024)
     78 
     79 	setlocale(LC_ALL, "");
     80 
     81 	append = 0;
     82 	while ((ch = getopt(argc, argv, "ai")) != -1)
     83 		switch((char)ch) {
     84 		case 'a':
     85 			append = 1;
     86 			break;
     87 		case 'i':
     88 			(void)signal(SIGINT, SIG_IGN);
     89 			break;
     90 		case '?':
     91 		default:
     92 			(void)fprintf(stderr, "usage: tee [-ai] [file ...]\n");
     93 			exit(1);
     94 		}
     95 	argv += optind;
     96 	argc -= optind;
     97 
     98 	if ((buf = malloc((size_t)BSIZE)) == NULL)
     99 		err(1, "malloc");
    100 
    101 	add(STDOUT_FILENO, "stdout");
    102 
    103 	for (exitval = 0; *argv; ++argv)
    104 		if ((fd = open(*argv, append ? O_WRONLY|O_CREAT|O_APPEND :
    105 		    O_WRONLY|O_CREAT|O_TRUNC, DEFFILEMODE)) < 0) {
    106 			warn("%s", *argv);
    107 			exitval = 1;
    108 		} else
    109 			add(fd, *argv);
    110 
    111 	while ((rval = read(STDIN_FILENO, buf, BSIZE)) > 0)
    112 		for (p = head; p; p = p->next) {
    113 			n = rval;
    114 			bp = buf;
    115 			do {
    116 				if ((wval = write(p->fd, bp, n)) == -1) {
    117 					warn("%s", p->name);
    118 					exitval = 1;
    119 					break;
    120 				}
    121 				bp += wval;
    122 			} while (n -= wval);
    123 		}
    124 	if (rval < 0) {
    125 		warn("read");
    126 		exitval = 1;
    127 	}
    128 
    129 	for (p = head; p; p = p->next) {
    130 		if (close(p->fd) == -1) {
    131 			warn("%s", p->name);
    132 			exitval = 1;
    133 		}
    134 	}
    135 
    136 	exit(exitval);
    137 }
    138 
    139 void
    140 add(fd, name)
    141 	int fd;
    142 	char *name;
    143 {
    144 	LIST *p;
    145 
    146 	if ((p = malloc((size_t)sizeof(LIST))) == NULL)
    147 		err(1, "malloc");
    148 	p->fd = fd;
    149 	p->name = name;
    150 	p->next = head;
    151 	head = p;
    152 }
    153