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+------------------------------------------------------------------------------
+-- --
+-- GNAT RUN-TIME COMPONENTS --
+-- --
+-- G N A T . C A L E N D A R --
+-- --
+-- B o d y --
+-- --
+-- Copyright (C) 1999-2005, AdaCore --
+-- --
+-- GNAT is free software; you can redistribute it and/or modify it under --
+-- terms of the GNU General Public License as published by the Free Soft- --
+-- ware Foundation; either version 2, or (at your option) any later ver- --
+-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
+-- OUT 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 distributed with GNAT; see file COPYING. If not, write --
+-- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, --
+-- Boston, MA 02110-1301, 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. --
+-- --
+-- GNAT was originally developed by the GNAT team at New York University. --
+-- Extensive contributions were provided by Ada Core Technologies Inc. --
+-- --
+------------------------------------------------------------------------------
+
+package body GNAT.Calendar is
+
+ use Ada.Calendar;
+ use Interfaces;
+
+ -----------------
+ -- Day_In_Year --
+ -----------------
+
+ function Day_In_Year (Date : Time) return Day_In_Year_Number is
+ Year : Year_Number;
+ Month : Month_Number;
+ Day : Day_Number;
+ Dsecs : Day_Duration;
+
+ begin
+ Split (Date, Year, Month, Day, Dsecs);
+
+ return Julian_Day (Year, Month, Day) - Julian_Day (Year, 1, 1) + 1;
+ end Day_In_Year;
+
+ -----------------
+ -- Day_Of_Week --
+ -----------------
+
+ function Day_Of_Week (Date : Time) return Day_Name is
+ Year : Year_Number;
+ Month : Month_Number;
+ Day : Day_Number;
+ Dsecs : Day_Duration;
+
+ begin
+ Split (Date, Year, Month, Day, Dsecs);
+
+ return Day_Name'Val ((Julian_Day (Year, Month, Day)) mod 7);
+ end Day_Of_Week;
+
+ ----------
+ -- Hour --
+ ----------
+
+ function Hour (Date : Time) return Hour_Number is
+ Year : Year_Number;
+ Month : Month_Number;
+ Day : Day_Number;
+ Hour : Hour_Number;
+ Minute : Minute_Number;
+ Second : Second_Number;
+ Sub_Second : Second_Duration;
+
+ begin
+ Split (Date, Year, Month, Day, Hour, Minute, Second, Sub_Second);
+ return Hour;
+ end Hour;
+
+ ----------------
+ -- Julian_Day --
+ ----------------
+
+ -- Julian_Day is used to by Day_Of_Week and Day_In_Year. Note
+ -- that this implementation is not expensive.
+
+ function Julian_Day
+ (Year : Year_Number;
+ Month : Month_Number;
+ Day : Day_Number) return Integer
+ is
+ Internal_Year : Integer;
+ Internal_Month : Integer;
+ Internal_Day : Integer;
+ Julian_Date : Integer;
+ C : Integer;
+ Ya : Integer;
+
+ begin
+ Internal_Year := Integer (Year);
+ Internal_Month := Integer (Month);
+ Internal_Day := Integer (Day);
+
+ if Internal_Month > 2 then
+ Internal_Month := Internal_Month - 3;
+ else
+ Internal_Month := Internal_Month + 9;
+ Internal_Year := Internal_Year - 1;
+ end if;
+
+ C := Internal_Year / 100;
+ Ya := Internal_Year - (100 * C);
+
+ Julian_Date := (146_097 * C) / 4 +
+ (1_461 * Ya) / 4 +
+ (153 * Internal_Month + 2) / 5 +
+ Internal_Day + 1_721_119;
+
+ return Julian_Date;
+ end Julian_Day;
+
+ ------------
+ -- Minute --
+ ------------
+
+ function Minute (Date : Time) return Minute_Number is
+ Year : Year_Number;
+ Month : Month_Number;
+ Day : Day_Number;
+ Hour : Hour_Number;
+ Minute : Minute_Number;
+ Second : Second_Number;
+ Sub_Second : Second_Duration;
+
+ begin
+ Split (Date, Year, Month, Day, Hour, Minute, Second, Sub_Second);
+ return Minute;
+ end Minute;
+
+ ------------
+ -- Second --
+ ------------
+
+ function Second (Date : Time) return Second_Number is
+ Year : Year_Number;
+ Month : Month_Number;
+ Day : Day_Number;
+ Hour : Hour_Number;
+ Minute : Minute_Number;
+ Second : Second_Number;
+ Sub_Second : Second_Duration;
+
+ begin
+ Split (Date, Year, Month, Day, Hour, Minute, Second, Sub_Second);
+ return Second;
+ end Second;
+
+ -----------
+ -- Split --
+ -----------
+
+ procedure Split
+ (Date : Time;
+ Year : out Year_Number;
+ Month : out Month_Number;
+ Day : out Day_Number;
+ Hour : out Hour_Number;
+ Minute : out Minute_Number;
+ Second : out Second_Number;
+ Sub_Second : out Second_Duration)
+ is
+ Dsecs : Day_Duration;
+ Secs : Natural;
+
+ begin
+ Split (Date, Year, Month, Day, Dsecs);
+
+ if Dsecs = 0.0 then
+ Secs := 0;
+ else
+ Secs := Natural (Dsecs - 0.5);
+ end if;
+
+ Sub_Second := Second_Duration (Dsecs - Day_Duration (Secs));
+ Hour := Hour_Number (Secs / 3600);
+ Secs := Secs mod 3600;
+ Minute := Minute_Number (Secs / 60);
+ Second := Second_Number (Secs mod 60);
+ end Split;
+
+ ----------------
+ -- Sub_Second --
+ ----------------
+
+ function Sub_Second (Date : Time) return Second_Duration is
+ Year : Year_Number;
+ Month : Month_Number;
+ Day : Day_Number;
+ Hour : Hour_Number;
+ Minute : Minute_Number;
+ Second : Second_Number;
+ Sub_Second : Second_Duration;
+
+ begin
+ Split (Date, Year, Month, Day, Hour, Minute, Second, Sub_Second);
+ return Sub_Second;
+ end Sub_Second;
+
+ -------------
+ -- Time_Of --
+ -------------
+
+ function Time_Of
+ (Year : Year_Number;
+ Month : Month_Number;
+ Day : Day_Number;
+ Hour : Hour_Number;
+ Minute : Minute_Number;
+ Second : Second_Number;
+ Sub_Second : Second_Duration := 0.0) return Time
+ is
+ Dsecs : constant Day_Duration :=
+ Day_Duration (Hour * 3600 + Minute * 60 + Second) +
+ Sub_Second;
+ begin
+ return Time_Of (Year, Month, Day, Dsecs);
+ end Time_Of;
+
+ -----------------
+ -- To_Duration --
+ -----------------
+
+ function To_Duration (T : access timeval) return Duration is
+
+ procedure timeval_to_duration
+ (T : access timeval;
+ sec : access C.long;
+ usec : access C.long);
+ pragma Import (C, timeval_to_duration, "__gnat_timeval_to_duration");
+
+ Micro : constant := 10**6;
+ sec : aliased C.long;
+ usec : aliased C.long;
+
+ begin
+ timeval_to_duration (T, sec'Access, usec'Access);
+ return Duration (sec) + Duration (usec) / Micro;
+ end To_Duration;
+
+ ----------------
+ -- To_Timeval --
+ ----------------
+
+ function To_Timeval (D : Duration) return timeval is
+
+ procedure duration_to_timeval (Sec, Usec : C.long; T : access timeval);
+ pragma Import (C, duration_to_timeval, "__gnat_duration_to_timeval");
+
+ Micro : constant := 10**6;
+ Result : aliased timeval;
+ sec : C.long;
+ usec : C.long;
+
+ begin
+ if D = 0.0 then
+ sec := 0;
+ usec := 0;
+ else
+ sec := C.long (D - 0.5);
+ usec := C.long ((D - Duration (sec)) * Micro - 0.5);
+ end if;
+
+ duration_to_timeval (sec, usec, Result'Access);
+
+ return Result;
+ end To_Timeval;
+
+ ------------------
+ -- Week_In_Year --
+ ------------------
+
+ function Week_In_Year
+ (Date : Ada.Calendar.Time) return Week_In_Year_Number
+ is
+ Year : Year_Number;
+ Month : Month_Number;
+ Day : Day_Number;
+ Hour : Hour_Number;
+ Minute : Minute_Number;
+ Second : Second_Number;
+ Sub_Second : Second_Duration;
+ Offset : Natural;
+
+ begin
+ Split (Date, Year, Month, Day, Hour, Minute, Second, Sub_Second);
+
+ -- Day offset number for the first week of the year
+
+ Offset := Julian_Day (Year, 1, 1) mod 7;
+
+ return 1 + ((Day_In_Year (Date) - 1) + Offset) / 7;
+ end Week_In_Year;
+
+end GNAT.Calendar;