compiler/clib/__arosc_gmtoffset.c

   1 /*
   2     Copyright © 1995-2012, The AROS Development Team. All rights reserved.
   3     $Id$
   4
   5     Internal arossstdc function to get current GMT offset
   6 */
   7 #include <proto/exec.h>
   8 #include <proto/locale.h>
   9 #include <exec/execbase.h>
  10
  11 /*****************************************************************************
  12
  13     NAME */
  14 #include <time.h>
  15
  16         int __arosc_gmtoffset (
  17
  18 /*  SYNOPSIS */
  19         void)
  20
  21 /*  FUNCTION
  22
  23     INPUTS
  24
  25     RESULT
  26         The offset to GMT in minutes
  27
  28     NOTES
  29         Will return 0 when locale.library is not loaded into memory yet.
  30
  31     EXAMPLE
  32
  33     BUGS
  34
  35     SEE ALSO
  36
  37     INTERNALS
  38         Will always query the current locale through locale.library to
  39         get the GMT offset.
  40
  41 ******************************************************************************/
  42 {
  43     static struct LocaleBase *LocaleBase = NULL;
  44     struct Locale *loc;
  45     int gmtoffset = 0;
  46
  47     if (!LocaleBase)
  48     {
  49         struct Node *found;
  50
  51         /* Only open locale.library if it does not have to be loaded from disk */
  52         Forbid();
  53         found = FindName(&SysBase->LibList, "locale.library");
  54         Permit();
  55
  56         if (found)
  57             LocaleBase = (struct LocaleBase *)OpenLibrary("locale.library", 0);
  58     }
  59
  60     if (LocaleBase && (loc = OpenLocale(NULL)))
  61     {
  62         gmtoffset = (int)loc->loc_GMTOffset;
  63         CloseLocale(loc);
  64     }
  65
  66     return gmtoffset;
  67 }