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tee.c revision 1.3 
      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 1.3 1993/12/31 19:31:52 jtc 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 #include <locale.h>
     54 #include <err.h>
     55 
     56 void add	__P((int, char *));
     57 
     58 typedef struct _list {
     59 	struct _list *next;
     60 	int fd;
     61 	char *name;
     62 } LIST;
     63 LIST *head;
     64 
     65 int
     66 main(argc, argv)
     67 	int argc;
     68 	char **argv;
     69 {
     70 	register LIST *p;
     71 	register int n, fd, rval, wval;
     72 	register char *bp;
     73 	int append, ch, exitval;
     74 	char *buf;
     75 
     76 	setlocale(LC_ALL, "");
     77 
     78 	append = 0;
     79 	while ((ch = getopt(argc, argv, "ai")) != -1)
     80 		switch((char)ch) {
     81 		case 'a':
     82 			append = 1;
     83 			break;
     84 		case 'i':
     85 			(void)signal(SIGINT, SIG_IGN);
     86 			break;
     87 		case '?':
     88 		default:
     89 			(void)fprintf(stderr, "usage: tee [-ai] [file ...]\n");
     90 			exit(1);
     91 		}
     92 	argv += optind;
     93 	argc -= optind;
     94 
     95 	if (!(buf = malloc((u_int)8 * 1024))) {
     96 		err(1, NULL);
     97 		/* NOTREACHED */
     98 	}
     99 
    100 	add(STDOUT_FILENO, "stdout");
    101 	for (; *argv; ++argv)
    102 		if ((fd = open(*argv, append ? O_WRONLY|O_CREAT|O_APPEND :
    103 		    O_WRONLY|O_CREAT|O_TRUNC, DEFFILEMODE)) < 0)
    104 			warn("%s", *argv);
    105 		else
    106 			add(fd, *argv);
    107 
    108 	exitval = 0;
    109 	while ((rval = read(STDIN_FILENO, buf, sizeof(buf))) > 0) {
    110 		for (p = head; p; p = p->next) {
    111 			n = rval;
    112 			bp = buf;
    113 			do {
    114 				if ((wval = write(p->fd, bp, n)) == -1) {
    115 					warn("%s", p->name);
    116 					exitval = 1;
    117 					break;
    118 				}
    119 				bp += wval;
    120 			} while (n -= wval);
    121 		}
    122 	}
    123 	if (rval < 0) {
    124 		warn("read");
    125 		exitval = 1;
    126 	}
    127 
    128 	for (p = head; p; p = p->next) {
    129 		if (close(p->fd)) {
    130 			warn("%s", p->name);
    131 			exitval = 1;
    132 		}
    133 	}
    134 
    135 	exit(exitval);
    136 }
    137 
    138 void
    139 add(fd, name)
    140 	int fd;
    141 	char *name;
    142 {
    143 	LIST *p;
    144 
    145 	if (!(p = malloc((u_int)sizeof(LIST)))) {
    146 		err(1, NULL);
    147 		/* NOTREACHED */
    148 	}
    149 	p->fd = fd;
    150 	p->name = name;
    151 	p->next = head;
    152 	head = p;
    153 }
    154