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Diffstat (limited to 'gcc/ada/libgnat/a-ststbo.ads')
| -rw-r--r-- | gcc/ada/libgnat/a-ststbo.ads | 74 |
1 files changed, 74 insertions, 0 deletions
diff --git a/gcc/ada/libgnat/a-ststbo.ads b/gcc/ada/libgnat/a-ststbo.ads new file mode 100644 index 0000000..1ce6d90 --- /dev/null +++ b/gcc/ada/libgnat/a-ststbo.ads @@ -0,0 +1,74 @@ +------------------------------------------------------------------------------ +-- -- +-- GNAT LIBRARY COMPONENTS -- +-- -- +-- A D A . S T R E A M S . S T O R A G E . B O U N D E D -- +-- -- +-- S p e c -- +-- -- +-- Copyright (C) 2020, Free Software Foundation, Inc. -- +-- -- +-- This specification is derived from the Ada Reference Manual for use with -- +-- GNAT. The copyright notice above, and the license provisions that follow -- +-- apply solely to the contents of the part following the private keyword. -- +-- -- +-- 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 3, 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. -- +-- -- +-- As a special exception under Section 7 of GPL version 3, you are granted -- +-- additional permissions described in the GCC Runtime Library Exception, -- +-- version 3.1, as published by the Free Software Foundation. -- +-- -- +-- You should have received a copy of the GNU General Public License and -- +-- a copy of the GCC Runtime Library Exception along with this program; -- +-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see -- +-- <http://www.gnu.org/licenses/>. -- +-- -- +------------------------------------------------------------------------------ + +pragma Ada_2020; +package Ada.Streams.Storage.Bounded with Pure is + + type Stream_Type (Max_Elements : Stream_Element_Count) is + new Storage_Stream_Type with private with + Default_Initial_Condition => Element_Count (Stream_Type) = 0; + + overriding procedure Read + (Stream : in out Stream_Type; Item : out Stream_Element_Array; + Last : out Stream_Element_Offset) + with Post => + (declare + Num_Read : constant Stream_Element_Count := + Stream_Element_Count'Min + (Element_Count (Stream)'Old, Item'Length); + begin + Last = Num_Read + Item'First - 1 + and + Element_Count (Stream) = + Element_Count (Stream)'Old - Num_Read); + + overriding procedure Write + (Stream : in out Stream_Type; Item : Stream_Element_Array) with + Post => Element_Count (Stream) = + Element_Count (Stream)'Old + Item'Length; + + overriding function Element_Count + (Stream : Stream_Type) return Stream_Element_Count with + Post => Element_Count'Result <= Stream.Max_Elements; + + overriding procedure Clear (Stream : in out Stream_Type) with + Post => Element_Count (Stream) = 0; + +private + + type Stream_Type (Max_Elements : Stream_Element_Count) is + new Storage_Stream_Type with record + Count : Stream_Element_Count := 0; + Elements : Stream_Element_Array (1 .. Max_Elements); + end record; + +end Ada.Streams.Storage.Bounded; |