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tee.c revision 1.2 
      1 /*
      2  * Copyright (c) 1988 Regents of the University of California.
      3  * All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      8  * 1. Redistributions of source code must retain the above copyright
      9  *    notice, this list of conditions and the following disclaimer.
     10  * 2. Redistributions in binary form must reproduce the above copyright
     11  *    notice, this list of conditions and the following disclaimer in the
     12  *    documentation and/or other materials provided with the distribution.
     13  * 3. All advertising materials mentioning features or use of this software
     14  *    must display the following acknowledgement:
     15  *	This product includes software developed by the University of
     16  *	California, Berkeley and its contributors.
     17  * 4. Neither the name of the University nor the names of its contributors
     18  *    may be used to endorse or promote products derived from this software
     19  *    without specific prior written permission.
     20  *
     21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     31  * SUCH DAMAGE.
     32  */
     33 
     34 #ifndef lint
     35 char copyright[] =
     36 "@(#) Copyright (c) 1988 Regents of the University of California.\n\
     37  All rights reserved.\n";
     38 #endif /* not lint */
     39 
     40 #ifndef lint
     41 /*static char sccsid[] = "from: @(#)tee.c	5.11 (Berkeley) 5/6/91";*/
     42 static char rcsid[] = "$Id: tee.c,v 1.2 1993/08/01 18:07:36 mycroft Exp $";
     43 #endif /* not lint */
     44 
     45 #include <sys/types.h>
     46 #include <sys/stat.h>
     47 #include <fcntl.h>
     48 #include <signal.h>
     49 #include <unistd.h>
     50 #include <stdio.h>
     51 #include <stdlib.h>
     52 #include <string.h>
     53 
     54 typedef struct _list {
     55 	struct _list *next;
     56 	int fd;
     57 	char *name;
     58 } LIST;
     59 LIST *head;
     60 
     61 main(argc, argv)
     62 	int argc;
     63 	char **argv;
     64 {
     65 	extern int errno, optind;
     66 	register LIST *p;
     67 	register int n, fd, rval, wval;
     68 	register char *bp;
     69 	int append, ch, exitval;
     70 	char *buf;
     71 	off_t lseek();
     72 
     73 	append = 0;
     74 	while ((ch = getopt(argc, argv, "ai")) != EOF)
     75 		switch((char)ch) {
     76 		case 'a':
     77 			append = 1;
     78 			break;
     79 		case 'i':
     80 			(void)signal(SIGINT, SIG_IGN);
     81 			break;
     82 		case '?':
     83 		default:
     84 			(void)fprintf(stderr, "usage: tee [-ai] [file ...]\n");
     85 			exit(1);
     86 		}
     87 	argv += optind;
     88 	argc -= optind;
     89 
     90 	if (!(buf = malloc((u_int)8 * 1024))) {
     91 		(void)fprintf(stderr, "tee: out of space.\n");
     92 		exit(1);
     93 	}
     94 	add(STDOUT_FILENO, "stdout");
     95 	for (; *argv; ++argv)
     96 		if ((fd = open(*argv, append ? O_WRONLY|O_CREAT|O_APPEND :
     97 		    O_WRONLY|O_CREAT|O_TRUNC, DEFFILEMODE)) < 0)
     98 			(void)fprintf(stderr, "tee: %s: %s.\n",
     99 			    *argv, strerror(errno));
    100 		else
    101 			add(fd, *argv);
    102 	exitval = 0;
    103 	while ((rval = read(STDIN_FILENO, buf, sizeof(buf))) > 0)
    104 		for (p = head; p; p = p->next) {
    105 			n = rval;
    106 			bp = buf;
    107 			do {
    108 				if ((wval = write(p->fd, bp, n)) == -1) {
    109 					(void)fprintf(stderr, "tee: %s: %s.\n",
    110 					    p->name, strerror(errno));
    111 					exitval = 1;
    112 					break;
    113 				}
    114 				bp += wval;
    115 			} while (n -= wval);
    116 		}
    117 	if (rval < 0) {
    118 		(void)fprintf(stderr, "tee: read: %s\n", strerror(errno));
    119 		exit(1);
    120 	}
    121 	exit(exitval);
    122 }
    123 
    124 add(fd, name)
    125 	int fd;
    126 	char *name;
    127 {
    128 	LIST *p;
    129 
    130 	if (!(p = malloc((u_int)sizeof(LIST)))) {
    131 		(void)fprintf(stderr, "tee: out of space.\n");
    132 		exit(1);
    133 	}
    134 	p->fd = fd;
    135 	p->name = name;
    136 	p->next = head;
    137 	head = p;
    138 }
    139