1 /* $NetBSD: tee.c,v 1.12 2016/09/05 00:40:30 sevan 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\
35 The Regents of the University of California. All rights reserved.");
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 1.12 2016/09/05 00:40:30 sevan 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 const char *name;
61 } LIST;
62 LIST *head;
63
64 void add(int, const char *);
65
66 int
main(int argc,char * argv[])67 main(int argc, char *argv[])
68 {
69 LIST *p;
70 ssize_t rval;
71 int fd;
72 int append, ch, exitval;
73 char *buf;
74 #define BSIZE (8 * 1024)
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(BSIZE)) == NULL)
96 err(1, "malloc");
97
98 add(STDOUT_FILENO, "stdout");
99
100 for (exitval = 0; *argv; ++argv)
101 if ((fd = open(*argv, append ? O_WRONLY|O_CREAT|O_APPEND :
102 O_WRONLY|O_CREAT|O_TRUNC, DEFFILEMODE)) < 0) {
103 warn("%s", *argv);
104 exitval = 1;
105 } else
106 add(fd, *argv);
107
108 while ((rval = read(STDIN_FILENO, buf, BSIZE)) > 0)
109 for (p = head; p; p = p->next) {
110 const char *bp = buf;
111 size_t n = rval;
112 ssize_t wval;
113
114 do {
115 if ((wval = write(p->fd, bp, n)) == -1) {
116 warn("%s", p->name);
117 exitval = 1;
118 break;
119 }
120 bp += wval;
121 } while (n -= wval);
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) == -1) {
130 warn("%s", p->name);
131 exitval = 1;
132 }
133 }
134
135 exit(exitval);
136 }
137
138 void
add(int fd,const char * name)139 add(int fd, const char *name)
140 {
141 LIST *p;
142
143 if ((p = malloc(sizeof(LIST))) == NULL)
144 err(1, "malloc");
145 p->fd = fd;
146 p->name = name;
147 p->next = head;
148 head = p;
149 }
150