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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 --
+-- --
+-- B o d y --
+-- --
+-- Copyright (C) 1992-2007, 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 2, 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. See the GNU General Public License --
+-- for more details. You should have received a copy of the GNU General --
+-- Public License distributed with GNAT; see file COPYING. If not, write --
+-- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, --
+-- Boston, MA 02110-1301, USA. --
+-- --
+-- As a special exception, if other files instantiate generics from this --
+-- unit, or you link this unit with other files to produce an executable, --
+-- this unit does not by itself cause the resulting executable to be --
+-- covered by the GNU General Public License. This exception does not --
+-- however invalidate any other reasons why the executable file might be --
+-- covered by the GNU Public License. --
+-- --
+-- GNAT was originally developed by the GNAT team at New York University. --
+-- Extensive contributions were provided by Ada Core Technologies Inc. --
+-- --
+------------------------------------------------------------------------------
+
+with Ada.IO_Exceptions;
+with Ada.Streams; use Ada.Streams;
+with Ada.Unchecked_Conversion;
+
+package body System.Stream_Attributes is
+
+ Err : exception renames Ada.IO_Exceptions.End_Error;
+ -- Exception raised if insufficient data read (note that the RM implies
+ -- that Data_Error might be the appropriate choice, but AI95-00132
+ -- decides with a binding interpretation that End_Error is preferred).
+
+ SU : constant := System.Storage_Unit;
+
+ subtype SEA is Ada.Streams.Stream_Element_Array;
+ subtype SEO is Ada.Streams.Stream_Element_Offset;
+
+ generic function UC renames Ada.Unchecked_Conversion;
+
+ -- Subtypes used to define Stream_Element_Array values that map
+ -- into the elementary types, using unchecked conversion.
+
+ Thin_Pointer_Size : constant := System.Address'Size;
+ Fat_Pointer_Size : constant := System.Address'Size * 2;
+
+ subtype S_AD is SEA (1 .. (Fat_Pointer_Size + SU - 1) / SU);
+ subtype S_AS is SEA (1 .. (Thin_Pointer_Size + SU - 1) / SU);
+ subtype S_B is SEA (1 .. (Boolean'Size + SU - 1) / SU);
+ subtype S_C is SEA (1 .. (Character'Size + SU - 1) / SU);
+ subtype S_F is SEA (1 .. (Float'Size + SU - 1) / SU);
+ subtype S_I is SEA (1 .. (Integer'Size + SU - 1) / SU);
+ subtype S_LF is SEA (1 .. (Long_Float'Size + SU - 1) / SU);
+ subtype S_LI is SEA (1 .. (Long_Integer'Size + SU - 1) / SU);
+ subtype S_LLF is SEA (1 .. (Long_Long_Float'Size + SU - 1) / SU);
+ subtype S_LLI is SEA (1 .. (Long_Long_Integer'Size + SU - 1) / SU);
+ subtype S_LLU is SEA (1 .. (UST.Long_Long_Unsigned'Size + SU - 1) / SU);
+ subtype S_LU is SEA (1 .. (UST.Long_Unsigned'Size + SU - 1) / SU);
+ subtype S_SF is SEA (1 .. (Short_Float'Size + SU - 1) / SU);
+ subtype S_SI is SEA (1 .. (Short_Integer'Size + SU - 1) / SU);
+ subtype S_SSI is SEA (1 .. (Short_Short_Integer'Size + SU - 1) / SU);
+ subtype S_SSU is SEA (1 .. (UST.Short_Short_Unsigned'Size + SU - 1) / SU);
+ subtype S_SU is SEA (1 .. (UST.Short_Unsigned'Size + SU - 1) / SU);
+ subtype S_U is SEA (1 .. (UST.Unsigned'Size + SU - 1) / SU);
+ subtype S_WC is SEA (1 .. (Wide_Character'Size + SU - 1) / SU);
+
+ -- Unchecked conversions from the elementary type to the stream type
+
+ function From_AD is new UC (Fat_Pointer, S_AD);
+ function From_AS is new UC (Thin_Pointer, S_AS);
+ function From_F is new UC (Float, S_F);
+ function From_I is new UC (Integer, S_I);
+ function From_LF is new UC (Long_Float, S_LF);
+ function From_LI is new UC (Long_Integer, S_LI);
+ function From_LLF is new UC (Long_Long_Float, S_LLF);
+ function From_LLI is new UC (Long_Long_Integer, S_LLI);
+ function From_LLU is new UC (UST.Long_Long_Unsigned, S_LLU);
+ function From_LU is new UC (UST.Long_Unsigned, S_LU);
+ function From_SF is new UC (Short_Float, S_SF);
+ function From_SI is new UC (Short_Integer, S_SI);
+ function From_SSI is new UC (Short_Short_Integer, S_SSI);
+ function From_SSU is new UC (UST.Short_Short_Unsigned, S_SSU);
+ function From_SU is new UC (UST.Short_Unsigned, S_SU);
+ function From_U is new UC (UST.Unsigned, S_U);
+ function From_WC is new UC (Wide_Character, S_WC);
+
+ -- Unchecked conversions from the stream type to elementary type
+
+ function To_AD is new UC (S_AD, Fat_Pointer);
+ function To_AS is new UC (S_AS, Thin_Pointer);
+ function To_F is new UC (S_F, Float);
+ function To_I is new UC (S_I, Integer);
+ function To_LF is new UC (S_LF, Long_Float);
+ function To_LI is new UC (S_LI, Long_Integer);
+ function To_LLF is new UC (S_LLF, Long_Long_Float);
+ function To_LLI is new UC (S_LLI, Long_Long_Integer);
+ function To_LLU is new UC (S_LLU, UST.Long_Long_Unsigned);
+ function To_LU is new UC (S_LU, UST.Long_Unsigned);
+ function To_SF is new UC (S_SF, Short_Float);
+ function To_SI is new UC (S_SI, Short_Integer);
+ function To_SSI is new UC (S_SSI, Short_Short_Integer);
+ function To_SSU is new UC (S_SSU, UST.Short_Short_Unsigned);
+ function To_SU is new UC (S_SU, UST.Short_Unsigned);
+ function To_U is new UC (S_U, UST.Unsigned);
+ function To_WC is new UC (S_WC, Wide_Character);
+
+ ----------
+ -- I_AD --
+ ----------
+
+ function I_AD (Stream : not null access RST) return Fat_Pointer is
+ T : S_AD;
+ L : SEO;
+
+ begin
+ Ada.Streams.Read (Stream.all, T, L);
+
+ if L < T'Last then
+ raise Err;
+ else
+ return To_AD (T);
+ end if;
+ end I_AD;
+
+ ----------
+ -- I_AS --
+ ----------
+
+ function I_AS (Stream : not null access RST) return Thin_Pointer is
+ T : S_AS;
+ L : SEO;
+
+ begin
+ Ada.Streams.Read (Stream.all, T, L);
+
+ if L < T'Last then
+ raise Err;
+ else
+ return To_AS (T);
+ end if;
+ end I_AS;
+
+ ---------
+ -- I_B --
+ ---------
+
+ function I_B (Stream : not null access RST) return Boolean is
+ T : S_B;
+ L : SEO;
+
+ begin
+ Ada.Streams.Read (Stream.all, T, L);
+
+ if L < T'Last then
+ raise Err;
+ else
+ return Boolean'Val (T (1));
+ end if;
+ end I_B;
+
+ ---------
+ -- I_C --
+ ---------
+
+ function I_C (Stream : not null access RST) return Character is
+ T : S_C;
+ L : SEO;
+
+ begin
+ Ada.Streams.Read (Stream.all, T, L);
+
+ if L < T'Last then
+ raise Err;
+ else
+ return Character'Val (T (1));
+ end if;
+ end I_C;
+
+ ---------
+ -- I_F --
+ ---------
+
+ function I_F (Stream : not null access RST) return Float is
+ T : S_F;
+ L : SEO;
+
+ begin
+ Ada.Streams.Read (Stream.all, T, L);
+
+ if L < T'Last then
+ raise Err;
+ else
+ return To_F (T);
+ end if;
+ end I_F;
+
+ ---------
+ -- I_I --
+ ---------
+
+ function I_I (Stream : not null access RST) return Integer is
+ T : S_I;
+ L : SEO;
+
+ begin
+ Ada.Streams.Read (Stream.all, T, L);
+
+ if L < T'Last then
+ raise Err;
+ else
+ return To_I (T);
+ end if;
+ end I_I;
+
+ ----------
+ -- I_LF --
+ ----------
+
+ function I_LF (Stream : not null access RST) return Long_Float is
+ T : S_LF;
+ L : SEO;
+
+ begin
+ Ada.Streams.Read (Stream.all, T, L);
+
+ if L < T'Last then
+ raise Err;
+ else
+ return To_LF (T);
+ end if;
+ end I_LF;
+
+ ----------
+ -- I_LI --
+ ----------
+
+ function I_LI (Stream : not null access RST) return Long_Integer is
+ T : S_LI;
+ L : SEO;
+
+ begin
+ Ada.Streams.Read (Stream.all, T, L);
+
+ if L < T'Last then
+ raise Err;
+ else
+ return To_LI (T);
+ end if;
+ end I_LI;
+
+ -----------
+ -- I_LLF --
+ -----------
+
+ function I_LLF (Stream : not null access RST) return Long_Long_Float is
+ T : S_LLF;
+ L : SEO;
+
+ begin
+ Ada.Streams.Read (Stream.all, T, L);
+
+ if L < T'Last then
+ raise Err;
+ else
+ return To_LLF (T);
+ end if;
+ end I_LLF;
+
+ -----------
+ -- I_LLI --
+ -----------
+
+ function I_LLI (Stream : not null access RST) return Long_Long_Integer is
+ T : S_LLI;
+ L : SEO;
+
+ begin
+ Ada.Streams.Read (Stream.all, T, L);
+
+ if L < T'Last then
+ raise Err;
+ else
+ return To_LLI (T);
+ end if;
+ end I_LLI;
+
+ -----------
+ -- I_LLU --
+ -----------
+
+ function I_LLU
+ (Stream : not null access RST) return UST.Long_Long_Unsigned
+ is
+ T : S_LLU;
+ L : SEO;
+
+ begin
+ Ada.Streams.Read (Stream.all, T, L);
+
+ if L < T'Last then
+ raise Err;
+ else
+ return To_LLU (T);
+ end if;
+ end I_LLU;
+
+ ----------
+ -- I_LU --
+ ----------
+
+ function I_LU (Stream : not null access RST) return UST.Long_Unsigned is
+ T : S_LU;
+ L : SEO;
+
+ begin
+ Ada.Streams.Read (Stream.all, T, L);
+
+ if L < T'Last then
+ raise Err;
+ else
+ return To_LU (T);
+ end if;
+ end I_LU;
+
+ ----------
+ -- I_SF --
+ ----------
+
+ function I_SF (Stream : not null access RST) return Short_Float is
+ T : S_SF;
+ L : SEO;
+
+ begin
+ Ada.Streams.Read (Stream.all, T, L);
+
+ if L < T'Last then
+ raise Err;
+ else
+ return To_SF (T);
+ end if;
+ end I_SF;
+
+ ----------
+ -- I_SI --
+ ----------
+
+ function I_SI (Stream : not null access RST) return Short_Integer is
+ T : S_SI;
+ L : SEO;
+
+ begin
+ Ada.Streams.Read (Stream.all, T, L);
+
+ if L < T'Last then
+ raise Err;
+ else
+ return To_SI (T);
+ end if;
+ end I_SI;
+
+ -----------
+ -- I_SSI --
+ -----------
+
+ function I_SSI (Stream : not null access RST) return Short_Short_Integer is
+ T : S_SSI;
+ L : SEO;
+
+ begin
+ Ada.Streams.Read (Stream.all, T, L);
+
+ if L < T'Last then
+ raise Err;
+ else
+ return To_SSI (T);
+ end if;
+ end I_SSI;
+
+ -----------
+ -- I_SSU --
+ -----------
+
+ function I_SSU
+ (Stream : not null access RST) return UST.Short_Short_Unsigned
+ is
+ T : S_SSU;
+ L : SEO;
+
+ begin
+ Ada.Streams.Read (Stream.all, T, L);
+
+ if L < T'Last then
+ raise Err;
+ else
+ return To_SSU (T);
+ end if;
+ end I_SSU;
+
+ ----------
+ -- I_SU --
+ ----------
+
+ function I_SU (Stream : not null access RST) return UST.Short_Unsigned is
+ T : S_SU;
+ L : SEO;
+
+ begin
+ Ada.Streams.Read (Stream.all, T, L);
+
+ if L < T'Last then
+ raise Err;
+ else
+ return To_SU (T);
+ end if;
+ end I_SU;
+
+ ---------
+ -- I_U --
+ ---------
+
+ function I_U (Stream : not null access RST) return UST.Unsigned is
+ T : S_U;
+ L : SEO;
+
+ begin
+ Ada.Streams.Read (Stream.all, T, L);
+
+ if L < T'Last then
+ raise Err;
+ else
+ return To_U (T);
+ end if;
+ end I_U;
+
+ ----------
+ -- I_WC --
+ ----------
+
+ function I_WC (Stream : not null access RST) return Wide_Character is
+ T : S_WC;
+ L : SEO;
+
+ begin
+ Ada.Streams.Read (Stream.all, T, L);
+
+ if L < T'Last then
+ raise Err;
+ else
+ return To_WC (T);
+ end if;
+ end I_WC;
+
+ ----------
+ -- W_AD --
+ ----------
+
+ procedure W_AD (Stream : not null access RST; Item : Fat_Pointer) is
+ T : constant S_AD := From_AD (Item);
+ begin
+ Ada.Streams.Write (Stream.all, T);
+ end W_AD;
+
+ ----------
+ -- W_AS --
+ ----------
+
+ procedure W_AS (Stream : not null access RST; Item : Thin_Pointer) is
+ T : constant S_AS := From_AS (Item);
+ begin
+ Ada.Streams.Write (Stream.all, T);
+ end W_AS;
+
+ ---------
+ -- W_B --
+ ---------
+
+ procedure W_B (Stream : not null access RST; Item : Boolean) is
+ T : S_B;
+ begin
+ T (1) := Boolean'Pos (Item);
+ Ada.Streams.Write (Stream.all, T);
+ end W_B;
+
+ ---------
+ -- W_C --
+ ---------
+
+ procedure W_C (Stream : not null access RST; Item : Character) is
+ T : S_C;
+ begin
+ T (1) := Character'Pos (Item);
+ Ada.Streams.Write (Stream.all, T);
+ end W_C;
+
+ ---------
+ -- W_F --
+ ---------
+
+ procedure W_F (Stream : not null access RST; Item : Float) is
+ T : constant S_F := From_F (Item);
+ begin
+ Ada.Streams.Write (Stream.all, T);
+ end W_F;
+
+ ---------
+ -- W_I --
+ ---------
+
+ procedure W_I (Stream : not null access RST; Item : Integer) is
+ T : constant S_I := From_I (Item);
+ begin
+ Ada.Streams.Write (Stream.all, T);
+ end W_I;
+
+ ----------
+ -- W_LF --
+ ----------
+
+ procedure W_LF (Stream : not null access RST; Item : Long_Float) is
+ T : constant S_LF := From_LF (Item);
+ begin
+ Ada.Streams.Write (Stream.all, T);
+ end W_LF;
+
+ ----------
+ -- W_LI --
+ ----------
+
+ procedure W_LI (Stream : not null access RST; Item : Long_Integer) is
+ T : constant S_LI := From_LI (Item);
+ begin
+ Ada.Streams.Write (Stream.all, T);
+ end W_LI;
+
+ -----------
+ -- W_LLF --
+ -----------
+
+ procedure W_LLF (Stream : not null access RST; Item : Long_Long_Float) is
+ T : constant S_LLF := From_LLF (Item);
+ begin
+ Ada.Streams.Write (Stream.all, T);
+ end W_LLF;
+
+ -----------
+ -- W_LLI --
+ -----------
+
+ procedure W_LLI
+ (Stream : not null access RST; Item : Long_Long_Integer)
+ is
+ T : constant S_LLI := From_LLI (Item);
+ begin
+ Ada.Streams.Write (Stream.all, T);
+ end W_LLI;
+
+ -----------
+ -- W_LLU --
+ -----------
+
+ procedure W_LLU
+ (Stream : not null access RST; Item : UST.Long_Long_Unsigned)
+ is
+ T : constant S_LLU := From_LLU (Item);
+ begin
+ Ada.Streams.Write (Stream.all, T);
+ end W_LLU;
+
+ ----------
+ -- W_LU --
+ ----------
+
+ procedure W_LU
+ (Stream : not null access RST; Item : UST.Long_Unsigned)
+ is
+ T : constant S_LU := From_LU (Item);
+ begin
+ Ada.Streams.Write (Stream.all, T);
+ end W_LU;
+
+ ----------
+ -- W_SF --
+ ----------
+
+ procedure W_SF (Stream : not null access RST; Item : Short_Float) is
+ T : constant S_SF := From_SF (Item);
+ begin
+ Ada.Streams.Write (Stream.all, T);
+ end W_SF;
+
+ ----------
+ -- W_SI --
+ ----------
+
+ procedure W_SI (Stream : not null access RST; Item : Short_Integer) is
+ T : constant S_SI := From_SI (Item);
+ begin
+ Ada.Streams.Write (Stream.all, T);
+ end W_SI;
+
+ -----------
+ -- W_SSI --
+ -----------
+
+ procedure W_SSI
+ (Stream : not null access RST; Item : Short_Short_Integer)
+ is
+ T : constant S_SSI := From_SSI (Item);
+ begin
+ Ada.Streams.Write (Stream.all, T);
+ end W_SSI;
+
+ -----------
+ -- W_SSU --
+ -----------
+
+ procedure W_SSU
+ (Stream : not null access RST; Item : UST.Short_Short_Unsigned)
+ is
+ T : constant S_SSU := From_SSU (Item);
+ begin
+ Ada.Streams.Write (Stream.all, T);
+ end W_SSU;
+
+ ----------
+ -- W_SU --
+ ----------
+
+ procedure W_SU
+ (Stream : not null access RST; Item : UST.Short_Unsigned)
+ is
+ T : constant S_SU := From_SU (Item);
+ begin
+ Ada.Streams.Write (Stream.all, T);
+ end W_SU;
+
+ ---------
+ -- W_U --
+ ---------
+
+ procedure W_U (Stream : not null access RST; Item : UST.Unsigned) is
+ T : constant S_U := From_U (Item);
+ begin
+ Ada.Streams.Write (Stream.all, T);
+ end W_U;
+
+ ----------
+ -- W_WC --
+ ----------
+
+ procedure W_WC (Stream : not null access RST; Item : Wide_Character) is
+ T : constant S_WC := From_WC (Item);
+ begin
+ Ada.Streams.Write (Stream.all, T);
+ end W_WC;
+
+end System.Stream_Attributes;