usr.bin/rcs/src/localzone.c

   1 /*
   2  * Copyright (c) 1989 The Regents of the University of California.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms are permitted
   6  * provided that the above copyright notice and this paragraph are
   7  * duplicated in all such forms and that any documentation,
   8  * advertising materials, and other materials related to such
   9  * distribution and use acknowledge that the software was developed
  10  * by the University of California, Berkeley.  The name of the
  11  * University may not be used to endorse or promote products derived
  12  * from this software without specific prior written permission.
  13  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
  14  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
  15  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  16  */
  17
  18 #ifndef lint
  19 static char sccsid[] = "@(#)localzone.c 5.1 (Berkeley) 8/15/89";
  20 #endif /* not lint */
  21
  22
  23 #include <sys/types.h>
  24 #include <sys/time.h>
  25 #include <stdio.h>
  26
  27 static int lclzon;
  28 localzone()
  29 {
  30         struct timezone tz;
  31
  32         if (!lclzon) {
  33                 (void)gettimeofday((struct timeval *)NULL, &tz);
  34                 lclzon = tz.tz_minuteswest;
  35         }
  36         return(lclzon);
  37 }