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Diffstat (limited to 'gcc/ada/4vcalend.ads')
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1 files changed, 101 insertions, 0 deletions
diff --git a/gcc/ada/4vcalend.ads b/gcc/ada/4vcalend.ads new file mode 100644 index 00000000000..3d6b7362791 --- /dev/null +++ b/gcc/ada/4vcalend.ads @@ -0,0 +1,101 @@ +------------------------------------------------------------------------------ +-- -- +-- GNAT RUNTIME COMPONENTS -- +-- -- +-- A D A . C A L E N D A R -- +-- -- +-- S p e c -- +-- -- +-- $Revision: 1.3 $ -- +-- -- +-- This specification is adapted from the Ada Reference Manual for use with -- +-- GNAT. In accordance with the copyright of that document, you can freely -- +-- copy and modify this specification, provided that if you redistribute a -- +-- modified version, any changes that you have made are clearly indicated. -- +-- -- +------------------------------------------------------------------------------ + +-- This is the Alpha/VMS version. + +with System.OS_Primitives; +package Ada.Calendar is + + package OSP renames System.OS_Primitives; + + type Time is private; + + -- Declarations representing limits of allowed local time values. Note that + -- these do NOT constrain the possible stored values of time which may well + -- permit a larger range of times (this is explicitly allowed in Ada 95). + + subtype Year_Number is Integer range 1901 .. 2099; + subtype Month_Number is Integer range 1 .. 12; + subtype Day_Number is Integer range 1 .. 31; + + subtype Day_Duration is Duration range 0.0 .. 86_400.0; + + function Clock return Time; + + function Year (Date : Time) return Year_Number; + function Month (Date : Time) return Month_Number; + function Day (Date : Time) return Day_Number; + function Seconds (Date : Time) return Day_Duration; + + procedure Split + (Date : Time; + Year : out Year_Number; + Month : out Month_Number; + Day : out Day_Number; + Seconds : out Day_Duration); + + function Time_Of + (Year : Year_Number; + Month : Month_Number; + Day : Day_Number; + Seconds : Day_Duration := 0.0) + return Time; + + function "+" (Left : Time; Right : Duration) return Time; + function "+" (Left : Duration; Right : Time) return Time; + function "-" (Left : Time; Right : Duration) return Time; + function "-" (Left : Time; Right : Time) return Duration; + + function "<" (Left, Right : Time) return Boolean; + function "<=" (Left, Right : Time) return Boolean; + function ">" (Left, Right : Time) return Boolean; + function ">=" (Left, Right : Time) return Boolean; + + Time_Error : exception; + +private + + pragma Inline (Clock); + + pragma Inline (Year); + pragma Inline (Month); + pragma Inline (Day); + + pragma Inline ("+"); + pragma Inline ("-"); + + pragma Inline ("<"); + pragma Inline ("<="); + pragma Inline (">"); + pragma Inline (">="); + + -- Time is represented as the number of 100-nanosecond (ns) units offset + -- from the system base date and time, which is 00:00 o'clock, + -- November 17, 1858 (the Smithsonian base date and time for the + -- astronomic calendar). + + -- The time value stored is typically a GMT value, as provided in standard + -- Unix environments. If this is the case then Split and Time_Of perform + -- required conversions to and from local times. + + type Time is new OSP.OS_Time; + + -- Notwithstanding this definition, Time is not quite the same as OS_Time. + -- Relative Time is positive, whereas relative OS_Time is negative, + -- but this declaration makes for easier conversion. + +end Ada.Calendar; |