xref: /freebsd/usr.bin/calendar/calendar.c (revision 39beb93c3f8bdbf72a61fda42300b5ebed7390c8)
1 /*
2  * Copyright (c) 1989, 1993, 1994
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
35 static const char copyright[] =
36 "@(#) Copyright (c) 1989, 1993\n\
37 	The Regents of the University of California.  All rights reserved.\n";
38 #endif
39 
40 #if 0
41 #ifndef lint
42 static char sccsid[] = "@(#)calendar.c  8.3 (Berkeley) 3/25/94";
43 #endif
44 #endif
45 
46 #include <sys/cdefs.h>
47 __FBSDID("$FreeBSD$");
48 
49 #include <err.h>
50 #include <errno.h>
51 #include <locale.h>
52 #include <pwd.h>
53 #include <stdio.h>
54 #include <stdlib.h>
55 #include <time.h>
56 #include <unistd.h>
57 
58 #include "pathnames.h"
59 #include "calendar.h"
60 
61 struct passwd	*pw;
62 int		doall = 0;
63 time_t		f_time = 0;
64 
65 int	f_dayAfter = 0;		/* days after current date */
66 int	f_dayBefore = 0;	/* days before current date */
67 int	Friday = 5;		/* day before weekend */
68 
69 static void	usage(void) __dead2;
70 
71 int
72 main(int argc, char *argv[])
73 {
74 	int ch;
75 
76 	(void)setlocale(LC_ALL, "");
77 
78 	while ((ch = getopt(argc, argv, "-A:aB:F:f:t:W:")) != -1)
79 		switch (ch) {
80 		case '-':		/* backward contemptible */
81 		case 'a':
82 			if (getuid()) {
83 				errno = EPERM;
84 				err(1, NULL);
85 			}
86 			doall = 1;
87 			break;
88 
89 		case 'f': /* other calendar file */
90 			calendarFile = optarg;
91 			break;
92 
93 		case 't': /* other date, undocumented, for tests */
94 			f_time = Mktime(optarg);
95 			break;
96 
97 		case 'W': /* we don't need no steenking Fridays */
98 			Friday = -1;
99 
100 			/* FALLTHROUGH */
101 		case 'A': /* days after current date */
102 			f_dayAfter = atoi(optarg);
103 			break;
104 
105 		case 'B': /* days before current date */
106 			f_dayBefore = atoi(optarg);
107 			break;
108 
109 		case 'F':
110 			Friday = atoi(optarg);
111 			break;
112 
113 		case '?':
114 		default:
115 			usage();
116 		}
117 
118 	argc -= optind;
119 	argv += optind;
120 
121 	if (argc)
122 		usage();
123 
124 	/* use current time */
125 	if (f_time <= 0)
126 		(void)time(&f_time);
127 
128 	settime(f_time);
129 
130 	if (doall)
131 		while ((pw = getpwent()) != NULL) {
132 			(void)setegid(pw->pw_gid);
133 			(void)initgroups(pw->pw_name, pw->pw_gid);
134 			(void)seteuid(pw->pw_uid);
135 			if (!chdir(pw->pw_dir))
136 				cal();
137 			(void)seteuid(0);
138 		}
139 	else
140 		cal();
141 	exit(0);
142 }
143 
144 
145 static void __dead2
146 usage(void)
147 {
148 
149 	fprintf(stderr, "%s\n%s\n",
150 	    "usage: calendar [-a] [-A days] [-B days] [-F friday] "
151 	    "[-f calendarfile]",
152 	    "                [-t dd[.mm[.year]]] [-W days]");
153 	exit(1);
154 }
155