tee.c revision 24360 
1/*
2 * Copyright (c) 1988, 1993
3 *	The Regents of the University of California.  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
35static char copyright[] =
36"@(#) Copyright (c) 1988, 1993\n\
37	The Regents of the University of California.  All rights reserved.\n";
38#endif /* not lint */
39
40#ifndef lint
41static char sccsid[] = "@(#)tee.c	8.1 (Berkeley) 6/6/93";
42#endif /* not lint */
43
44#include <sys/types.h>
45#include <sys/stat.h>
46#include <signal.h>
47#include <errno.h>
48#include <fcntl.h>
49#include <unistd.h>
50#include <stdio.h>
51#include <stdlib.h>
52#include <string.h>
53
54typedef struct _list {
55	struct _list *next;
56	int fd;
57	char *name;
58} LIST;
59LIST *head;
60
61void add __P((int, char *));
62void err __P((int, const char *, ...));
63
64int
65main(argc, argv)
66	int argc;
67	char *argv[];
68{
69	register LIST *p;
70	register int n, fd, rval, wval;
71	register char *bp;
72	int append, ch, exitval;
73	char *buf;
74#define	BSIZE (8 * 1024)
75
76	append = 0;
77	while ((ch = getopt(argc, argv, "ai")) != -1)
78		switch((char)ch) {
79		case 'a':
80			append = 1;
81			break;
82		case 'i':
83			(void)signal(SIGINT, SIG_IGN);
84			break;
85		case '?':
86		default:
87			(void)fprintf(stderr, "usage: tee [-ai] [file ...]\n");
88			exit(1);
89		}
90	argv += optind;
91	argc -= optind;
92
93	if ((buf = malloc((u_int)BSIZE)) == NULL)
94		err(1, "%s", strerror(errno));
95
96	add(STDOUT_FILENO, "stdout");
97
98	for (exitval = 0; *argv; ++argv)
99		if ((fd = open(*argv, append ? O_WRONLY|O_CREAT|O_APPEND :
100		    O_WRONLY|O_CREAT|O_TRUNC, DEFFILEMODE)) < 0) {
101			err(0, "%s: %s", *argv, strerror(errno));
102			exitval = 1;
103		} else
104			add(fd, *argv);
105
106	while ((rval = read(STDIN_FILENO, buf, BSIZE)) > 0)
107		for (p = head; p; p = p->next) {
108			n = rval;
109			bp = buf;
110			do {
111				if ((wval = write(p->fd, bp, n)) == -1) {
112					err(0, "%s: %s",
113					    p->name, strerror(errno));
114					exitval = 1;
115					break;
116				}
117				bp += wval;
118			} while (n -= wval);
119		}
120	if (rval < 0)
121		err(1, "read: %s", strerror(errno));
122	exit(exitval);
123}
124
125void
126add(fd, name)
127	int fd;
128	char *name;
129{
130	LIST *p;
131
132	if ((p = malloc((u_int)sizeof(LIST))) == NULL)
133		err(1, "%s", strerror(errno));
134	p->fd = fd;
135	p->name = name;
136	p->next = head;
137	head = p;
138}
139
140#if __STDC__
141#include <stdarg.h>
142#else
143#include <varargs.h>
144#endif
145
146void
147#if __STDC__
148err(int doexit, const char *fmt, ...)
149#else
150err(doexit, fmt, va_alist)
151	int doexit;
152	char *fmt;
153        va_dcl
154#endif
155{
156	va_list ap;
157#if __STDC__
158	va_start(ap, fmt);
159#else
160	va_start(ap);
161#endif
162	(void)fprintf(stderr, "tee: ");
163	(void)vfprintf(stderr, fmt, ap);
164	va_end(ap);
165	(void)fprintf(stderr, "\n");
166	if (doexit)
167		exit(1);
168}
169