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248 | -- --
-- package GLib.Time_Zone Copyright (c) Dmitry A. Kazakov --
-- Implementation Spring, 2019 --
-- --
-- Last revision : 00:00 10 Dec 2019 --
-- --
-- This library is free software; you can redistribute it and/or --
-- modify it under the terms of the GNU General Public License as --
-- published by the Free Software Foundation; either version 2 of --
-- the License, or (at your option) any later version. This library --
-- is distributed in the hope that it will be useful, but WITHOUT --
-- ANY WARRANTY; without even the implied warranty of --
-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU --
-- General Public License for more details. You should have --
-- received a copy of the GNU General Public License along with --
-- this library; if not, write to the Free Software Foundation, --
-- Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. --
-- --
-- As a special exception, if other files instantiate generics from --
-- this unit, or you link this unit with other files to produce an --
-- executable, this unit does not by itself cause the resulting --
-- executable to be covered by the GNU General Public License. This --
-- exception does not however invalidate any other reasons why the --
-- executable file might be covered by the GNU Public License. --
--____________________________________________________________________--
with Interfaces.C; use Interfaces.C;
with Interfaces.C.Strings; use Interfaces.C.Strings;
with System; use System;
with Ada.Calendar.Formatting;
with Ada.Calendar.Time_Zones;
with System.Address_To_Access_Conversions;
package body GLib.Time_Zone is
Epoch : constant Time :=
Ada.Calendar.Formatting.Time_Of (1970, 01, 01);
package Conversions is
new System.Address_To_Access_Conversions (GTime_Zone);
function Get_Identifier_Fallback (TZ : GTime_Zone) return chars_ptr;
pragma External
( C,
Get_Identifier_Fallback,
"g_time_zone_get_identifier"
);
pragma Weak_External (Get_Identifier_Fallback);
function Adjust_Time
( TZ : GTime_Zone;
Time_Type : GTime_Type;
Time_Stamp : GInt64
) return GInt is
function Internal
( TZ : Address;
Time_Type : GTime_Type;
Time_Stamp : access GInt64
) return GInt;
pragma Import (C, Internal, "g_time_zone_adjust_time");
Stamp : aliased GInt64 := Time_Stamp;
begin
return Internal (TZ'Address, Time_Type, Stamp'Access);
end Adjust_Time;
function Adjust_Time
( TZ : GTime_Zone;
Time_Stamp : Time
) return GInt is
use Ada.Calendar.Time_Zones;
begin
return Adjust_Time
( TZ,
G_TIME_TYPE_UNIVERSAL,
GInt64
( Time_Stamp
- Duration (UTC_Time_Offset (Time_Stamp)) * 60.0
- Epoch
) );
end Adjust_Time;
function Find_Interval
( TZ : GTime_Zone;
Time_Type : GTime_Type;
Time_Stamp : GInt64
) return GInt is
function Internal
( TZ : Address;
Time_Type : GTime_Type;
Time_Stamp : access GInt64
) return GInt;
pragma Import (C, Internal, "g_time_zone_find_interval");
Stamp : aliased GInt64 := Time_Stamp;
begin
return Internal (TZ'Address, Time_Type, Stamp'Access);
end Find_Interval;
function Find_Interval
( TZ : GTime_Zone;
Time_Stamp : Time
) return GInt is
use Ada.Calendar.Time_Zones;
begin
return Find_Interval
( TZ,
G_TIME_TYPE_UNIVERSAL,
GInt64
( Time_Stamp
- Duration (UTC_Time_Offset (Time_Stamp)) * 60.0
- Epoch
) );
end Find_Interval;
function Get_Abbreviation
( TZ : GTime_Zone;
Interval : GInt
) return UTF8_String is
function Internal
( TZ : Address;
Interval : GInt
) return chars_ptr;
pragma Import (C, Internal, "g_time_zone_get_abbreviation");
Ptr : constant chars_ptr := Internal (TZ'Address, Interval);
begin
if Ptr = Null_Ptr then
return "";
else
return Value (Ptr);
end if;
end Get_Abbreviation;
function Get_Identifier (TZ : GTime_Zone) return UTF8_String is
function Internal (TZ : Address) return chars_ptr;
pragma Import (C, Internal, "g_time_zone_get_identifier");
Ptr : constant chars_ptr := Internal (TZ'Address);
begin
if Ptr = Null_Ptr then
return "";
else
return Value (Ptr);
end if;
end Get_Identifier;
function Get_Identifier_Fallback (TZ : GTime_Zone)
return chars_ptr is
Result : chars_ptr;
for Result'Address use TZ'Address;
begin
return Result;
end Get_Identifier_Fallback;
function Get_Offset
( TZ : GTime_Zone;
Interval : GInt
) return Duration is
function Internal
( TZ : Address;
Interval : GInt
) return GInt32;
pragma Import (C, Internal, "g_time_zone_get_offset");
begin
return Duration (Internal (TZ'Address, Interval));
end Get_Offset;
function Gtk_New (Identifier : String) return access GTime_Zone is
function Internal
( Identifier : char_array
) return Address;
pragma Import (C, Internal, "g_time_zone_new");
begin
return Conversions.To_Pointer
( Internal (To_C (Identifier))
) .all'Unchecked_Access;
end Gtk_New;
function Gtk_New_Local return access GTime_Zone is
function Internal return Address;
pragma Import (C, Internal, "g_time_zone_new_local");
begin
return Conversions.To_Pointer (Internal).all'Unchecked_Access;
end Gtk_New_Local;
function Gtk_New_Offset
( Offset : Duration
) return access GTime_Zone is
subtype Figure is Integer range 0..9;
function Decimal (Value : Figure) return Character is
begin
return Character'Val (Character'Pos ('0') + Value);
end Decimal;
function Image (Value : Integer) return String is
begin
return Decimal ((Value / 10) mod 10) & Decimal (Value mod 10);
end Image;
Seconds : Integer := Integer (abs Offset);
Hours : Integer;
Minutes : Integer;
begin
Hours := Seconds / 3_600;
Seconds := Seconds mod 3_600;
Minutes := Seconds / 60;
Seconds := Seconds mod 60;
if Offset >= 0.0 then
return Gtk_New
( '+' & Image (Hours)
& ':' & Image (Minutes)
& ':' & Image (Seconds)
);
else
return Gtk_New
( '-' & Image (Hours)
& ':' & Image (Minutes)
& ':' & Image (Seconds)
);
end if;
end Gtk_New_Offset;
function Gtk_New_UTC return access GTime_Zone is
function Internal return Address;
pragma Import (C, Internal, "g_time_zone_new_utc");
begin
return Conversions.To_Pointer (Internal).all'Unchecked_Access;
end Gtk_New_UTC;
function Is_DST
( TZ : GTime_Zone;
Interval : GInt
) return Boolean is
function Internal
( TZ : Address;
Interval : GInt
) return GBoolean;
pragma Import (C, Internal, "g_time_zone_is_dst");
begin
return Internal (TZ'Address, Interval) /= 0;
end Is_DST;
procedure Ref (TZ : GTime_Zone) is
function Internal (TZ : Address) return Address;
pragma Import (C, Internal, "g_time_zone_ref");
Result : Address;
begin
Result := Internal (TZ'Address);
end Ref;
end GLib.Time_Zone;
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