File : s-stratt.adb
------------------------------------------------------------------------------
-- --
-- GNAT RUNTIME COMPONENTS --
-- --
5 -- 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 --
-- --
-- $Revision: 1.7 $ --
10 -- --
-- Copyright (C) 1992-1998, 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- --
15 -- 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 --
20 -- Public License distributed with GNAT; see file COPYING. If not, write --
-- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
-- MA 02111-1307, USA. --
-- --
-- As a special exception, if other files instantiate generics from this --
25 -- 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. --
30 -- --
-- GNAT was originally developed by the GNAT team at New York University. --
-- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). --
-- --
------------------------------------------------------------------------------
35
with Ada.IO_Exceptions;
with Ada.Streams; use Ada.Streams;
with Unchecked_Conversion;
40 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 AI195-00132
45 -- decides with a binding interpretation that End_Error is preferred).
SU : constant := System.Storage_Unit;
subtype SEA is Ada.Streams.Stream_Element_Array;
50 subtype SEO is Ada.Streams.Stream_Element_Offset;
generic function UC renames Unchecked_Conversion;
-- Subtypes used to define Stream_Element_Array values that map
55 -- into the elementary types, using unchecked conversion.
Thin_Pointer_Size : constant := System.Address'Size;
Fat_Pointer_Size : constant := System.Address'Size * 2;
60 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);
65 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);
70 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);
75 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);
80 -- 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_C is new UC (Character, S_C);
85 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);
90 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);
95 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);
100
-- 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);
105 function To_C is new UC (S_C, Character);
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);
110 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);
115 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);
120 function To_WC is new UC (S_WC, Wide_Character);
----------
-- I_AD --
----------
125
function I_AD (Stream : access RST) return Fat_Pointer is
T : S_AD;
L : SEO;
130 begin
Ada.Streams.Read (Stream.all, T, L);
if L < T'Last then
raise Err;
135 else
return To_AD (T);
end if;
end I_AD;
140 ----------
-- I_AS --
----------
function I_AS (Stream : access RST) return Thin_Pointer is
145 T : S_AS;
L : SEO;
begin
Ada.Streams.Read (Stream.all, T, L);
150
if L < T'Last then
raise Err;
else
return To_AS (T);
155 end if;
end I_AS;
---------
-- I_B --
160 ---------
function I_B (Stream : access RST) return Boolean is
T : S_B;
L : SEO;
165
begin
Ada.Streams.Read (Stream.all, T, L);
if L < T'Last then
170 raise Err;
else
return Boolean'Val (T (1));
end if;
end I_B;
175
---------
-- I_C --
---------
180 function I_C (Stream : access RST) return Character is
T : S_C;
L : SEO;
begin
185 Ada.Streams.Read (Stream.all, T, L);
if L < T'Last then
raise Err;
else
190 return To_C (T);
end if;
end I_C;
---------
195 -- I_F --
---------
function I_F (Stream : access RST) return Float is
T : S_F;
200 L : SEO;
begin
Ada.Streams.Read (Stream.all, T, L);
205 if L < T'Last then
raise Err;
else
return To_F (T);
end if;
210 end I_F;
---------
-- I_I --
---------
215
function I_I (Stream : access RST) return Integer is
T : S_I;
L : SEO;
220 begin
Ada.Streams.Read (Stream.all, T, L);
if L < T'Last then
raise Err;
225 else
return To_I (T);
end if;
end I_I;
230 ----------
-- I_LF --
----------
function I_LF (Stream : access RST) return Long_Float is
235 T : S_LF;
L : SEO;
begin
Ada.Streams.Read (Stream.all, T, L);
240
if L < T'Last then
raise Err;
else
return To_LF (T);
245 end if;
end I_LF;
----------
-- I_LI --
250 ----------
function I_LI (Stream : access RST) return Long_Integer is
T : S_LI;
L : SEO;
255
begin
Ada.Streams.Read (Stream.all, T, L);
if L < T'Last then
260 raise Err;
else
return To_LI (T);
end if;
end I_LI;
265
-----------
-- I_LLF --
-----------
270 function I_LLF (Stream : access RST) return Long_Long_Float is
T : S_LLF;
L : SEO;
begin
275 Ada.Streams.Read (Stream.all, T, L);
if L < T'Last then
raise Err;
else
280 return To_LLF (T);
end if;
end I_LLF;
-----------
285 -- I_LLI --
-----------
function I_LLI (Stream : access RST) return Long_Long_Integer is
T : S_LLI;
290 L : SEO;
begin
Ada.Streams.Read (Stream.all, T, L);
295 if L < T'Last then
raise Err;
else
return To_LLI (T);
end if;
300 end I_LLI;
-----------
-- I_LLU --
-----------
305
function I_LLU (Stream : access RST) return UST.Long_Long_Unsigned is
T : S_LLU;
L : SEO;
310 begin
Ada.Streams.Read (Stream.all, T, L);
if L < T'Last then
raise Err;
315 else
return To_LLU (T);
end if;
end I_LLU;
320 ----------
-- I_LU --
----------
function I_LU (Stream : access RST) return UST.Long_Unsigned is
325 T : S_LU;
L : SEO;
begin
Ada.Streams.Read (Stream.all, T, L);
330
if L < T'Last then
raise Err;
else
return To_LU (T);
335 end if;
end I_LU;
----------
-- I_SF --
340 ----------
function I_SF (Stream : access RST) return Short_Float is
T : S_SF;
L : SEO;
345
begin
Ada.Streams.Read (Stream.all, T, L);
if L < T'Last then
350 raise Err;
else
return To_SF (T);
end if;
end I_SF;
355
----------
-- I_SI --
----------
360 function I_SI (Stream : access RST) return Short_Integer is
T : S_SI;
L : SEO;
begin
365 Ada.Streams.Read (Stream.all, T, L);
if L < T'Last then
raise Err;
else
370 return To_SI (T);
end if;
end I_SI;
-----------
375 -- I_SSI --
-----------
function I_SSI (Stream : access RST) return Short_Short_Integer is
T : S_SSI;
380 L : SEO;
begin
Ada.Streams.Read (Stream.all, T, L);
385 if L < T'Last then
raise Err;
else
return To_SSI (T);
end if;
390 end I_SSI;
-----------
-- I_SSU --
-----------
395
function I_SSU (Stream : access RST) return UST.Short_Short_Unsigned is
T : S_SSU;
L : SEO;
400 begin
Ada.Streams.Read (Stream.all, T, L);
if L < T'Last then
raise Err;
405 else
return To_SSU (T);
end if;
end I_SSU;
410 ----------
-- I_SU --
----------
function I_SU (Stream : access RST) return UST.Short_Unsigned is
415 T : S_SU;
L : SEO;
begin
Ada.Streams.Read (Stream.all, T, L);
420
if L < T'Last then
raise Err;
else
return To_SU (T);
425 end if;
end I_SU;
---------
-- I_U --
430 ---------
function I_U (Stream : access RST) return UST.Unsigned is
T : S_U;
L : SEO;
435
begin
Ada.Streams.Read (Stream.all, T, L);
if L < T'Last then
440 raise Err;
else
return To_U (T);
end if;
end I_U;
445
----------
-- I_WC --
----------
450 function I_WC (Stream : access RST) return Wide_Character is
T : S_WC;
L : SEO;
begin
455 Ada.Streams.Read (Stream.all, T, L);
if L < T'Last then
raise Err;
else
460 return To_WC (T);
end if;
end I_WC;
----------
465 -- W_AD --
----------
procedure W_AD (Stream : access RST; Item : in Fat_Pointer) is
T : constant S_AD := From_AD (Item);
470
begin
Ada.Streams.Write (Stream.all, T);
end W_AD;
475 ----------
-- W_AS --
----------
procedure W_AS (Stream : access RST; Item : in Thin_Pointer) is
480 T : constant S_AS := From_AS (Item);
begin
Ada.Streams.Write (Stream.all, T);
end W_AS;
485
---------
-- W_B --
---------
490 procedure W_B (Stream : access RST; Item : in Boolean) is
T : S_B;
begin
T (1) := Boolean'Pos (Item);
495 Ada.Streams.Write (Stream.all, T);
end W_B;
---------
-- W_C --
500 ---------
procedure W_C (Stream : access RST; Item : in Character) is
T : constant S_C := From_C (Item);
505 begin
Ada.Streams.Write (Stream.all, T);
end W_C;
---------
510 -- W_F --
---------
procedure W_F (Stream : access RST; Item : in Float) is
T : constant S_F := From_F (Item);
515
begin
Ada.Streams.Write (Stream.all, T);
end W_F;
520 ---------
-- W_I --
---------
procedure W_I (Stream : access RST; Item : in Integer) is
525 T : constant S_I := From_I (Item);
begin
Ada.Streams.Write (Stream.all, T);
end W_I;
530
----------
-- W_LF --
----------
535 procedure W_LF (Stream : access RST; Item : in Long_Float) is
T : constant S_LF := From_LF (Item);
begin
Ada.Streams.Write (Stream.all, T);
540 end W_LF;
----------
-- W_LI --
----------
545
procedure W_LI (Stream : access RST; Item : in Long_Integer) is
T : constant S_LI := From_LI (Item);
begin
550 Ada.Streams.Write (Stream.all, T);
end W_LI;
-----------
-- W_LLF --
555 -----------
procedure W_LLF (Stream : access RST; Item : in Long_Long_Float) is
T : constant S_LLF := From_LLF (Item);
560 begin
Ada.Streams.Write (Stream.all, T);
end W_LLF;
-----------
565 -- W_LLI --
-----------
procedure W_LLI (Stream : access RST; Item : in Long_Long_Integer) is
T : constant S_LLI := From_LLI (Item);
570
begin
Ada.Streams.Write (Stream.all, T);
end W_LLI;
575 -----------
-- W_LLU --
-----------
procedure W_LLU (Stream : access RST; Item : in UST.Long_Long_Unsigned) is
580 T : constant S_LLU := From_LLU (Item);
begin
Ada.Streams.Write (Stream.all, T);
end W_LLU;
585
----------
-- W_LU --
----------
590 procedure W_LU (Stream : access RST; Item : in UST.Long_Unsigned) is
T : constant S_LU := From_LU (Item);
begin
Ada.Streams.Write (Stream.all, T);
595 end W_LU;
----------
-- W_SF --
----------
600
procedure W_SF (Stream : access RST; Item : in Short_Float) is
T : constant S_SF := From_SF (Item);
begin
605 Ada.Streams.Write (Stream.all, T);
end W_SF;
----------
-- W_SI --
610 ----------
procedure W_SI (Stream : access RST; Item : in Short_Integer) is
T : constant S_SI := From_SI (Item);
615 begin
Ada.Streams.Write (Stream.all, T);
end W_SI;
-----------
620 -- W_SSI --
-----------
procedure W_SSI (Stream : access RST; Item : in Short_Short_Integer) is
T : constant S_SSI := From_SSI (Item);
625
begin
Ada.Streams.Write (Stream.all, T);
end W_SSI;
630 -----------
-- W_SSU --
-----------
procedure W_SSU (Stream : access RST; Item : in UST.Short_Short_Unsigned) is
635 T : constant S_SSU := From_SSU (Item);
begin
Ada.Streams.Write (Stream.all, T);
end W_SSU;
640
----------
-- W_SU --
----------
645 procedure W_SU (Stream : access RST; Item : in UST.Short_Unsigned) is
T : constant S_SU := From_SU (Item);
begin
Ada.Streams.Write (Stream.all, T);
650 end W_SU;
---------
-- W_U --
---------
655
procedure W_U (Stream : access RST; Item : in UST.Unsigned) is
T : constant S_U := From_U (Item);
begin
660 Ada.Streams.Write (Stream.all, T);
end W_U;
----------
-- W_WC --
665 ----------
procedure W_WC (Stream : access RST; Item : in Wide_Character) is
T : constant S_WC := From_WC (Item);
670 begin
Ada.Streams.Write (Stream.all, T);
end W_WC;
end System.Stream_Attributes;