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. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  * @(#) Copyright (c) 1989, 1993 The Regents of the University of California.  All rights reserved.
  30  * @(#)calendar.c  8.3 (Berkeley) 3/25/94
  31  * $FreeBSD: src/usr.bin/calendar/calendar.c,v 1.11.2.5 2003/04/06 20:04:56 dwmalone Exp $
  32  * $DragonFly: src/usr.bin/calendar/calendar.c,v 1.5 2007/09/24 20:49:09 pavalos Exp $
  33  */
  34
  35 #include <err.h>
  36 #include <errno.h>
  37 #include <locale.h>
  38 #include <pwd.h>
  39 #include <stdio.h>
  40 #include <stdlib.h>
  41 #include <sysexits.h>
  42 #include <time.h>
  43 #include <unistd.h>
  44
  45 #include "pathnames.h"
  46 #include "calendar.h"
  47
  48 struct passwd *pw;
  49 int doall = 0;
  50 int f_dayAfter = 0; /* days after current date */
  51 int f_dayBefore = 0; /* days before current date */
  52 int Friday = 5;      /* day before weekend */
  53
  54 static void     usage(void);
  55
  56 int
  57 main(int argc, char **argv)
  58 {
  59         int ch;
  60         time_t f_time = 0;
  61
  62         setlocale(LC_ALL, "");
  63
  64         while ((ch = getopt(argc, argv, "-af:t:A:B:F:W:")) != -1) {
  65                 switch (ch) {
  66                 case '-':               /* backward compatible */
  67                 case 'a':
  68                         if (getuid()) {
  69                                 errno = EPERM;
  70                                 err(EXIT_FAILURE, NULL);
  71                         }
  72                         doall = 1;
  73                         break;
  74
  75                 case 'f': /* other calendar file */
  76                         calendarFile = optarg;
  77                         break;
  78
  79                 case 't': /* other date, undocumented, for tests */
  80                         f_time = Mktime(optarg);
  81                         break;
  82
  83                 case 'W': /* we don't need no steenking Fridays */
  84                         Friday = -1;
  85
  86                         /* FALLTHROUGH */
  87                 case 'A': /* days after current date */
  88                         f_dayAfter = atoi(optarg);
  89                         break;
  90
  91                 case 'B': /* days before current date */
  92                         f_dayBefore = atoi(optarg);
  93                         break;
  94
  95                 case 'F':
  96                         Friday = atoi(optarg);
  97                         break;
  98
  99                 case '?':
 100                 default:
 101                         usage();
 102                 }
 103         }
 104         argc -= optind;
 105         argv += optind;
 106
 107         if (argc)
 108                 usage();
 109
 110         /* use current time */
 111         if (f_time <= 0)
 112             time(&f_time);
 113
 114         settime(f_time);
 115
 116         if (doall)
 117                 while ((pw = getpwent()) != NULL) {
 118                         setegid(pw->pw_gid);
 119                         initgroups(pw->pw_name, pw->pw_gid);
 120                         seteuid(pw->pw_uid);
 121                         if (!chdir(pw->pw_dir))
 122                                 cal();
 123                         seteuid(0);
 124                 }
 125         else
 126                 cal();
 127         exit(EX_OK);
 128 }
 129
 130
 131 static void
 132 usage(void)
 133 {
 134         fprintf(stderr, "%s\n%s\n",
 135             "usage: calendar [-a] [-A days] [-B days] [-F friday] "
 136             "[-f calendarfile]",
 137             "                [-t dd[.mm[.year]]] [-W days]");
 138         exit(EX_USAGE);
 139 }