usr.bin/calendar/calendar.c

   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  * @(#) Copyright (c) 1989, 1993 The Regents of the University of California.  All rights reserved.
  34  * @(#)calendar.c  8.3 (Berkeley) 3/25/94
  35  * $FreeBSD: src/usr.bin/calendar/calendar.c,v 1.11.2.5 2003/04/06 20:04:56 dwmalone Exp $
  36  * $DragonFly: src/usr.bin/calendar/calendar.c,v 1.5 2007/09/24 20:49:09 pavalos Exp $
  37  */
  38
  39 #include <err.h>
  40 #include <errno.h>
  41 #include <locale.h>
  42 #include <pwd.h>
  43 #include <stdio.h>
  44 #include <stdlib.h>
  45 #include <sysexits.h>
  46 #include <time.h>
  47 #include <unistd.h>
  48
  49 #include "pathnames.h"
  50 #include "calendar.h"
  51
  52 struct passwd *pw;
  53 int doall = 0;
  54 int f_dayAfter = 0; /* days after current date */
  55 int f_dayBefore = 0; /* days before current date */
  56 int Friday = 5;      /* day before weekend */
  57
  58 static void     usage(void);
  59
  60 int
  61 main(int argc, char **argv)
  62 {
  63         int ch;
  64         time_t f_time = 0;
  65
  66         setlocale(LC_ALL, "");
  67
  68         while ((ch = getopt(argc, argv, "-af:t:A:B:F:W:")) != -1) {
  69                 switch (ch) {
  70                 case '-':               /* backward compatible */
  71                 case 'a':
  72                         if (getuid()) {
  73                                 errno = EPERM;
  74                                 err(EXIT_FAILURE, NULL);
  75                         }
  76                         doall = 1;
  77                         break;
  78
  79                 case 'f': /* other calendar file */
  80                         calendarFile = optarg;
  81                         break;
  82
  83                 case 't': /* other date, undocumented, for tests */
  84                         f_time = Mktime(optarg);
  85                         break;
  86
  87                 case 'W': /* we don't need no steenking Fridays */
  88                         Friday = -1;
  89
  90                         /* FALLTHROUGH */
  91                 case 'A': /* days after current date */
  92                         f_dayAfter = atoi(optarg);
  93                         break;
  94
  95                 case 'B': /* days before current date */
  96                         f_dayBefore = atoi(optarg);
  97                         break;
  98
  99                 case 'F':
 100                         Friday = atoi(optarg);
 101                         break;
 102
 103                 case '?':
 104                 default:
 105                         usage();
 106                 }
 107         }
 108         argc -= optind;
 109         argv += optind;
 110
 111         if (argc)
 112                 usage();
 113
 114         /* use current time */
 115         if (f_time <= 0)
 116             time(&f_time);
 117
 118         settime(f_time);
 119
 120         if (doall)
 121                 while ((pw = getpwent()) != NULL) {
 122                         setegid(pw->pw_gid);
 123                         initgroups(pw->pw_name, pw->pw_gid);
 124                         seteuid(pw->pw_uid);
 125                         if (!chdir(pw->pw_dir))
 126                                 cal();
 127                         seteuid(0);
 128                 }
 129         else
 130                 cal();
 131         exit(EX_OK);
 132 }
 133
 134
 135 static void
 136 usage(void)
 137 {
 138         fprintf(stderr, "%s\n%s\n",
 139             "usage: calendar [-a] [-A days] [-B days] [-F friday] "
 140             "[-f calendarfile]",
 141             "                [-t dd[.mm[.year]]] [-W days]");
 142         exit(EX_USAGE);
 143 }