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+------------------------------------------------------------------------------
+-- --
+-- GNAT RUN-TIME COMPONENTS --
+-- --
+-- S Y S T E M . S T R E A M _ A T T R I B U T E S --
+-- --
+-- S p e c --
+-- --
+-- Copyright (C) 1992-2009, Free Software Foundation, Inc. --
+-- --
+-- 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/>. --
+-- --
+-- GNAT was originally developed by the GNAT team at New York University. --
+-- Extensive contributions were provided by Ada Core Technologies Inc. --
+-- --
+------------------------------------------------------------------------------
+
+-- This package contains the implementations of the stream attributes for
+-- elementary types. These are the subprograms that are directly accessed
+-- by occurrences of the stream attributes where the type is elementary.
+
+-- We only provide the subprograms for the standard base types. For user
+-- defined types, the subprogram for the corresponding root type is called
+-- with an appropriate conversion.
+
+with System;
+with System.Unsigned_Types;
+with Ada.Streams;
+
+package System.Stream_Attributes is
+ pragma Preelaborate;
+
+ pragma Suppress (Accessibility_Check, Stream_Attributes);
+ -- No need to check accessibility on arguments of subprograms
+
+ package UST renames System.Unsigned_Types;
+
+ subtype RST is Ada.Streams.Root_Stream_Type'Class;
+
+ subtype SEC is Ada.Streams.Stream_Element_Count;
+
+ -- Enumeration types are usually transferred using the routine for the
+ -- corresponding integer. The exception is that special routines are
+ -- provided for Boolean and the character types, in case the protocol
+ -- in use provides specially for these types.
+
+ -- Access types use either a thin pointer (single address) or fat pointer
+ -- (double address) form. The following types are used to hold access
+ -- values using unchecked conversions.
+
+ type Thin_Pointer is record
+ P1 : System.Address;
+ end record;
+
+ type Fat_Pointer is record
+ P1 : System.Address;
+ P2 : System.Address;
+ end record;
+
+ ------------------------------------
+ -- Treatment of enumeration types --
+ ------------------------------------
+
+ -- In this interface, there are no specific routines for general input
+ -- or output of enumeration types. Generally, enumeration types whose
+ -- representation is unsigned (no negative representation values) are
+ -- treated as unsigned integers, and enumeration types that do have
+ -- negative representation values are treated as signed integers.
+
+ -- An exception is that there are specialized routines for Boolean,
+ -- Character, and Wide_Character types, but these specialized routines
+ -- are used only if the type in question has a standard representation.
+ -- For the case of a non-standard representation (one where the size of
+ -- the first subtype is specified, or where an enumeration representation
+ -- clause is given, these three types are treated like any other cases
+ -- of enumeration types, as described above.
+ -- for
+
+ ---------------------
+ -- Input Functions --
+ ---------------------
+
+ -- Functions for S'Input attribute. These functions are also used for
+ -- S'Read, with the obvious transformation, since the input operation
+ -- is the same for all elementary types (no bounds or discriminants
+ -- are involved).
+
+ function I_AD (Stream : not null access RST) return Fat_Pointer;
+ function I_AS (Stream : not null access RST) return Thin_Pointer;
+ function I_B (Stream : not null access RST) return Boolean;
+ function I_C (Stream : not null access RST) return Character;
+ function I_F (Stream : not null access RST) return Float;
+ function I_I (Stream : not null access RST) return Integer;
+ function I_LF (Stream : not null access RST) return Long_Float;
+ function I_LI (Stream : not null access RST) return Long_Integer;
+ function I_LLF (Stream : not null access RST) return Long_Long_Float;
+ function I_LLI (Stream : not null access RST) return Long_Long_Integer;
+ function I_LLU (Stream : not null access RST) return UST.Long_Long_Unsigned;
+ function I_LU (Stream : not null access RST) return UST.Long_Unsigned;
+ function I_SF (Stream : not null access RST) return Short_Float;
+ function I_SI (Stream : not null access RST) return Short_Integer;
+ function I_SSI (Stream : not null access RST) return Short_Short_Integer;
+ function I_SSU (Stream : not null access RST)
+ return UST.Short_Short_Unsigned;
+ function I_SU (Stream : not null access RST) return UST.Short_Unsigned;
+ function I_U (Stream : not null access RST) return UST.Unsigned;
+ function I_WC (Stream : not null access RST) return Wide_Character;
+ function I_WWC (Stream : not null access RST) return Wide_Wide_Character;
+
+ -----------------------
+ -- Output Procedures --
+ -----------------------
+
+ -- Procedures for S'Write attribute. These procedures are also used
+ -- for 'Output, since for elementary types there is no difference
+ -- between 'Write and 'Output because there are no discriminants
+ -- or bounds to be written.
+
+ procedure W_AD (Stream : not null access RST; Item : Fat_Pointer);
+ procedure W_AS (Stream : not null access RST; Item : Thin_Pointer);
+ procedure W_B (Stream : not null access RST; Item : Boolean);
+ procedure W_C (Stream : not null access RST; Item : Character);
+ procedure W_F (Stream : not null access RST; Item : Float);
+ procedure W_I (Stream : not null access RST; Item : Integer);
+ procedure W_LF (Stream : not null access RST; Item : Long_Float);
+ procedure W_LI (Stream : not null access RST; Item : Long_Integer);
+ procedure W_LLF (Stream : not null access RST; Item : Long_Long_Float);
+ procedure W_LLI (Stream : not null access RST; Item : Long_Long_Integer);
+ procedure W_LLU (Stream : not null access RST;
+ Item : UST.Long_Long_Unsigned);
+ procedure W_LU (Stream : not null access RST; Item : UST.Long_Unsigned);
+ procedure W_SF (Stream : not null access RST; Item : Short_Float);
+ procedure W_SI (Stream : not null access RST; Item : Short_Integer);
+ procedure W_SSI (Stream : not null access RST;
+ Item : Short_Short_Integer);
+ procedure W_SSU (Stream : not null access RST;
+ Item : UST.Short_Short_Unsigned);
+ procedure W_SU (Stream : not null access RST;
+ Item : UST.Short_Unsigned);
+ procedure W_U (Stream : not null access RST; Item : UST.Unsigned);
+ procedure W_WC (Stream : not null access RST; Item : Wide_Character);
+ procedure W_WWC (Stream : not null access RST; Item : Wide_Wide_Character);
+
+ function Block_IO_OK return Boolean;
+ -- Package System.Stream_Attributes has several bodies - the default one
+ -- distributed with GNAT, s-strxdr.adb which is based on the XDR standard
+ -- and s-stratt.adb for Garlic. All three bodies share the same spec. The
+ -- role of this function is to determine whether the current version of
+ -- System.Stream_Attributes is able to support block IO.
+
+private
+ pragma Inline (I_AD);
+ pragma Inline (I_AS);
+ pragma Inline (I_B);
+ pragma Inline (I_C);
+ pragma Inline (I_F);
+ pragma Inline (I_I);
+ pragma Inline (I_LF);
+ pragma Inline (I_LI);
+ pragma Inline (I_LLF);
+ pragma Inline (I_LLI);
+ pragma Inline (I_LLU);
+ pragma Inline (I_LU);
+ pragma Inline (I_SF);
+ pragma Inline (I_SI);
+ pragma Inline (I_SSI);
+ pragma Inline (I_SSU);
+ pragma Inline (I_SU);
+ pragma Inline (I_U);
+ pragma Inline (I_WC);
+ pragma Inline (I_WWC);
+
+ pragma Inline (W_AD);
+ pragma Inline (W_AS);
+ pragma Inline (W_B);
+ pragma Inline (W_C);
+ pragma Inline (W_F);
+ pragma Inline (W_I);
+ pragma Inline (W_LF);
+ pragma Inline (W_LI);
+ pragma Inline (W_LLF);
+ pragma Inline (W_LLI);
+ pragma Inline (W_LLU);
+ pragma Inline (W_LU);
+ pragma Inline (W_SF);
+ pragma Inline (W_SI);
+ pragma Inline (W_SSI);
+ pragma Inline (W_SSU);
+ pragma Inline (W_SU);
+ pragma Inline (W_U);
+ pragma Inline (W_WC);
+ pragma Inline (W_WWC);
+
+ pragma Inline (Block_IO_OK);
+
+end System.Stream_Attributes;