208 lines
9.8 KiB
Ada
208 lines
9.8 KiB
Ada
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------------------------------------------------------------------------------
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-- --
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-- GNAT RUN-TIME COMPONENTS --
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-- --
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-- S Y S T E M . S T R E A M _ A T T R I B U T E S --
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-- --
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-- S p e c --
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-- --
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-- Copyright (C) 1992-2013, Free Software Foundation, Inc. --
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-- --
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-- GNAT is free software; you can redistribute it and/or modify it under --
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-- terms of the GNU General Public License as published by the Free Soft- --
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-- ware Foundation; either version 3, or (at your option) any later ver- --
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-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE. --
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-- --
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-- As a special exception under Section 7 of GPL version 3, you are granted --
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-- additional permissions described in the GCC Runtime Library Exception, --
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-- version 3.1, as published by the Free Software Foundation. --
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-- --
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-- You should have received a copy of the GNU General Public License and --
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-- a copy of the GCC Runtime Library Exception along with this program; --
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-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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-- <http://www.gnu.org/licenses/>. --
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-- --
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-- GNAT was originally developed by the GNAT team at New York University. --
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-- Extensive contributions were provided by Ada Core Technologies Inc. --
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-- --
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------------------------------------------------------------------------------
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-- This package contains the implementations of the stream attributes for
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-- elementary types. These are the subprograms that are directly accessed
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-- by occurrences of the stream attributes where the type is elementary.
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-- We only provide the subprograms for the standard base types. For user
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-- defined types, the subprogram for the corresponding root type is called
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-- with an appropriate conversion.
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with System;
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with System.Unsigned_Types;
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with Ada.Streams;
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package System.Stream_Attributes is
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pragma Preelaborate;
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pragma Suppress (Accessibility_Check, Stream_Attributes);
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-- No need to check accessibility on arguments of subprograms
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package UST renames System.Unsigned_Types;
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subtype RST is Ada.Streams.Root_Stream_Type'Class;
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subtype SEC is Ada.Streams.Stream_Element_Count;
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-- Enumeration types are usually transferred using the routine for the
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-- corresponding integer. The exception is that special routines are
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-- provided for Boolean and the character types, in case the protocol
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-- in use provides specially for these types.
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-- Access types use either a thin pointer (single address) or fat pointer
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-- (double address) form. The following types are used to hold access
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-- values using unchecked conversions.
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type Thin_Pointer is record
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P1 : System.Address;
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end record;
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type Fat_Pointer is record
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P1 : System.Address;
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P2 : System.Address;
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end record;
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------------------------------------
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-- Treatment of enumeration types --
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------------------------------------
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-- In this interface, there are no specific routines for general input
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-- or output of enumeration types. Generally, enumeration types whose
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-- representation is unsigned (no negative representation values) are
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-- treated as unsigned integers, and enumeration types that do have
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-- negative representation values are treated as signed integers.
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-- An exception is that there are specialized routines for Boolean,
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-- Character, and Wide_Character types, but these specialized routines
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-- are used only if the type in question has a standard representation.
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-- For the case of a non-standard representation (one where the size of
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-- the first subtype is specified, or where an enumeration representation
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-- clause is given, these three types are treated like any other cases
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-- of enumeration types, as described above.
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---------------------
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-- Input Functions --
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---------------------
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-- Functions for S'Input attribute. These functions are also used for
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-- S'Read, with the obvious transformation, since the input operation
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-- is the same for all elementary types (no bounds or discriminants
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-- are involved).
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function I_AD (Stream : not null access RST) return Fat_Pointer;
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function I_AS (Stream : not null access RST) return Thin_Pointer;
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function I_B (Stream : not null access RST) return Boolean;
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function I_C (Stream : not null access RST) return Character;
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function I_F (Stream : not null access RST) return Float;
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function I_I (Stream : not null access RST) return Integer;
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function I_LF (Stream : not null access RST) return Long_Float;
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function I_LI (Stream : not null access RST) return Long_Integer;
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function I_LLF (Stream : not null access RST) return Long_Long_Float;
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function I_LLI (Stream : not null access RST) return Long_Long_Integer;
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function I_LLU (Stream : not null access RST) return UST.Long_Long_Unsigned;
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function I_LU (Stream : not null access RST) return UST.Long_Unsigned;
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function I_SF (Stream : not null access RST) return Short_Float;
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function I_SI (Stream : not null access RST) return Short_Integer;
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function I_SSI (Stream : not null access RST) return Short_Short_Integer;
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function I_SSU (Stream : not null access RST) return
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UST.Short_Short_Unsigned;
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function I_SU (Stream : not null access RST) return UST.Short_Unsigned;
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function I_U (Stream : not null access RST) return UST.Unsigned;
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function I_WC (Stream : not null access RST) return Wide_Character;
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function I_WWC (Stream : not null access RST) return Wide_Wide_Character;
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-----------------------
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-- Output Procedures --
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-----------------------
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-- Procedures for S'Write attribute. These procedures are also used for
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-- 'Output, since for elementary types there is no difference between
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-- 'Write and 'Output because there are no discriminants or bounds to
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-- be written.
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procedure W_AD (Stream : not null access RST; Item : Fat_Pointer);
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procedure W_AS (Stream : not null access RST; Item : Thin_Pointer);
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procedure W_B (Stream : not null access RST; Item : Boolean);
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procedure W_C (Stream : not null access RST; Item : Character);
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procedure W_F (Stream : not null access RST; Item : Float);
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procedure W_I (Stream : not null access RST; Item : Integer);
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procedure W_LF (Stream : not null access RST; Item : Long_Float);
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procedure W_LI (Stream : not null access RST; Item : Long_Integer);
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procedure W_LLF (Stream : not null access RST; Item : Long_Long_Float);
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procedure W_LLI (Stream : not null access RST; Item : Long_Long_Integer);
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procedure W_LLU (Stream : not null access RST; Item :
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UST.Long_Long_Unsigned);
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procedure W_LU (Stream : not null access RST; Item : UST.Long_Unsigned);
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procedure W_SF (Stream : not null access RST; Item : Short_Float);
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procedure W_SI (Stream : not null access RST; Item : Short_Integer);
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procedure W_SSI (Stream : not null access RST; Item : Short_Short_Integer);
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procedure W_SSU (Stream : not null access RST; Item :
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UST.Short_Short_Unsigned);
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procedure W_SU (Stream : not null access RST; Item : UST.Short_Unsigned);
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procedure W_U (Stream : not null access RST; Item : UST.Unsigned);
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procedure W_WC (Stream : not null access RST; Item : Wide_Character);
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procedure W_WWC (Stream : not null access RST; Item : Wide_Wide_Character);
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function Block_IO_OK return Boolean;
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-- Package System.Stream_Attributes has several bodies - the default one
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-- distributed with GNAT, and s-stratt-xdr.adb, which is based on the XDR
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-- standard. Both bodies share the same spec. The role of this function is
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-- to indicate whether the current version of System.Stream_Attributes
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-- supports block IO. See System.Strings.Stream_Ops (s-ststop) for details.
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private
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pragma Inline (I_AD);
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pragma Inline (I_AS);
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pragma Inline (I_B);
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pragma Inline (I_C);
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pragma Inline (I_F);
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pragma Inline (I_I);
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pragma Inline (I_LF);
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pragma Inline (I_LI);
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pragma Inline (I_LLF);
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pragma Inline (I_LLI);
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pragma Inline (I_LLU);
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pragma Inline (I_LU);
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pragma Inline (I_SF);
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pragma Inline (I_SI);
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pragma Inline (I_SSI);
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pragma Inline (I_SSU);
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pragma Inline (I_SU);
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pragma Inline (I_U);
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pragma Inline (I_WC);
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pragma Inline (I_WWC);
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pragma Inline (W_AD);
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pragma Inline (W_AS);
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pragma Inline (W_B);
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pragma Inline (W_C);
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pragma Inline (W_F);
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pragma Inline (W_I);
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pragma Inline (W_LF);
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pragma Inline (W_LI);
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pragma Inline (W_LLF);
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pragma Inline (W_LLI);
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pragma Inline (W_LLU);
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pragma Inline (W_LU);
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pragma Inline (W_SF);
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pragma Inline (W_SI);
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pragma Inline (W_SSI);
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pragma Inline (W_SSU);
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pragma Inline (W_SU);
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pragma Inline (W_U);
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pragma Inline (W_WC);
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pragma Inline (W_WWC);
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pragma Inline (Block_IO_OK);
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end System.Stream_Attributes;
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