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 1.4 2006/09/16 18:38:00 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 int
  59 main(int argc, char **argv)
  60 {
  61         int ch;
  62         time_t f_time = 0;
  63
  64         setlocale(LC_ALL, "");
  65
  66         while ((ch = getopt(argc, argv, "-af:t:A:B:F:W:")) != -1) {
  67                 switch (ch) {
  68                 case '-':               /* backward compatible */
  69                 case 'a':
  70                         if (getuid()) {
  71                                 errno = EPERM;
  72                                 err(EXIT_FAILURE, NULL);
  73                         }
  74                         doall = 1;
  75                         break;
  76
  77                 case 'f': /* other calendar file */
  78                         calendarFile = optarg;
  79                         break;
  80
  81                 case 't': /* other date, undocumented, for tests */
  82                         f_time = Mktime(optarg);
  83                         break;
  84
  85                 case 'W': /* we don't need no steenking Fridays */
  86                         Friday = -1;
  87
  88                         /* FALLTHROUGH */
  89                 case 'A': /* days after current date */
  90                         f_dayAfter = atoi(optarg);
  91                         break;
  92
  93                 case 'B': /* days before current date */
  94                         f_dayBefore = atoi(optarg);
  95                         break;
  96
  97                 case 'F':
  98                         Friday = atoi(optarg);
  99                         break;
 100
 101                 case '?':
 102                 default:
 103                         usage();
 104                 }
 105         }
 106         argc -= optind;
 107         argv += optind;
 108
 109         if (argc)
 110                 usage();
 111
 112         /* use current time */
 113         if (f_time <= 0)
 114             time(&f_time);
 115
 116         settime(f_time);
 117
 118         if (doall)
 119                 while ((pw = getpwent()) != NULL) {
 120                         setegid(pw->pw_gid);
 121                         initgroups(pw->pw_name, pw->pw_gid);
 122                         seteuid(pw->pw_uid);
 123                         if (!chdir(pw->pw_dir))
 124                                 cal();
 125                         seteuid(0);
 126                 }
 127         else
 128                 cal();
 129         exit(EX_OK);
 130 }
 131
 132
 133 void
 134 usage(void)
 135 {
 136         fprintf(stderr, "%s\n%s\n",
 137             "usage: calendar [-a] [-A days] [-B days] [-F friday] "
 138             "[-f calendarfile]",
 139             "                [-t dd[.mm[.year]]] [-W days]");
 140         exit(EX_USAGE);
 141 }