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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;