1 ------------------------------------------------------------------------------
3 -- GNAT RUN-TIME COMPONENTS --
5 -- S Y S T E M . S T R E A M _ A T T R I B U T E S --
9 -- Copyright (C) 1992-2007, Free Software Foundation, Inc. --
11 -- GNAT is free software; you can redistribute it and/or modify it under --
12 -- terms of the GNU General Public License as published by the Free Soft- --
13 -- ware Foundation; either version 2, or (at your option) any later ver- --
14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
16 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
17 -- for more details. You should have received a copy of the GNU General --
18 -- Public License distributed with GNAT; see file COPYING. If not, write --
19 -- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, --
20 -- Boston, MA 02110-1301, USA. --
22 -- As a special exception, if other files instantiate generics from this --
23 -- unit, or you link this unit with other files to produce an executable, --
24 -- this unit does not by itself cause the resulting executable to be --
25 -- covered by the GNU General Public License. This exception does not --
26 -- however invalidate any other reasons why the executable file might be --
27 -- covered by the GNU Public License. --
29 -- GNAT was originally developed by the GNAT team at New York University. --
30 -- Extensive contributions were provided by Ada Core Technologies Inc. --
32 ------------------------------------------------------------------------------
34 with Ada.IO_Exceptions;
35 with Ada.Streams; use Ada.Streams;
36 with Ada.Unchecked_Conversion;
38 package body System.Stream_Attributes is
40 Err : exception renames Ada.IO_Exceptions.End_Error;
41 -- Exception raised if insufficient data read (note that the RM implies
42 -- that Data_Error might be the appropriate choice, but AI95-00132
43 -- decides with a binding interpretation that End_Error is preferred).
45 SU : constant := System.Storage_Unit;
47 subtype SEA is Ada.Streams.Stream_Element_Array;
48 subtype SEO is Ada.Streams.Stream_Element_Offset;
50 generic function UC renames Ada.Unchecked_Conversion;
52 -- Subtypes used to define Stream_Element_Array values that map
53 -- into the elementary types, using unchecked conversion.
55 Thin_Pointer_Size : constant := System.Address'Size;
56 Fat_Pointer_Size : constant := System.Address'Size * 2;
58 subtype S_AD is SEA (1 .. (Fat_Pointer_Size + SU - 1) / SU);
59 subtype S_AS is SEA (1 .. (Thin_Pointer_Size + SU - 1) / SU);
60 subtype S_B is SEA (1 .. (Boolean'Size + SU - 1) / SU);
61 subtype S_C is SEA (1 .. (Character'Size + SU - 1) / SU);
62 subtype S_F is SEA (1 .. (Float'Size + SU - 1) / SU);
63 subtype S_I is SEA (1 .. (Integer'Size + SU - 1) / SU);
64 subtype S_LF is SEA (1 .. (Long_Float'Size + SU - 1) / SU);
65 subtype S_LI is SEA (1 .. (Long_Integer'Size + SU - 1) / SU);
66 subtype S_LLF is SEA (1 .. (Long_Long_Float'Size + SU - 1) / SU);
67 subtype S_LLI is SEA (1 .. (Long_Long_Integer'Size + SU - 1) / SU);
68 subtype S_LLU is SEA (1 .. (UST.Long_Long_Unsigned'Size + SU - 1) / SU);
69 subtype S_LU is SEA (1 .. (UST.Long_Unsigned'Size + SU - 1) / SU);
70 subtype S_SF is SEA (1 .. (Short_Float'Size + SU - 1) / SU);
71 subtype S_SI is SEA (1 .. (Short_Integer'Size + SU - 1) / SU);
72 subtype S_SSI is SEA (1 .. (Short_Short_Integer'Size + SU - 1) / SU);
73 subtype S_SSU is SEA (1 .. (UST.Short_Short_Unsigned'Size + SU - 1) / SU);
74 subtype S_SU is SEA (1 .. (UST.Short_Unsigned'Size + SU - 1) / SU);
75 subtype S_U is SEA (1 .. (UST.Unsigned'Size + SU - 1) / SU);
76 subtype S_WC is SEA (1 .. (Wide_Character'Size + SU - 1) / SU);
78 -- Unchecked conversions from the elementary type to the stream type
80 function From_AD is new UC (Fat_Pointer, S_AD);
81 function From_AS is new UC (Thin_Pointer, S_AS);
82 function From_F is new UC (Float, S_F);
83 function From_I is new UC (Integer, S_I);
84 function From_LF is new UC (Long_Float, S_LF);
85 function From_LI is new UC (Long_Integer, S_LI);
86 function From_LLF is new UC (Long_Long_Float, S_LLF);
87 function From_LLI is new UC (Long_Long_Integer, S_LLI);
88 function From_LLU is new UC (UST.Long_Long_Unsigned, S_LLU);
89 function From_LU is new UC (UST.Long_Unsigned, S_LU);
90 function From_SF is new UC (Short_Float, S_SF);
91 function From_SI is new UC (Short_Integer, S_SI);
92 function From_SSI is new UC (Short_Short_Integer, S_SSI);
93 function From_SSU is new UC (UST.Short_Short_Unsigned, S_SSU);
94 function From_SU is new UC (UST.Short_Unsigned, S_SU);
95 function From_U is new UC (UST.Unsigned, S_U);
96 function From_WC is new UC (Wide_Character, S_WC);
98 -- Unchecked conversions from the stream type to elementary type
100 function To_AD is new UC (S_AD, Fat_Pointer);
101 function To_AS is new UC (S_AS, Thin_Pointer);
102 function To_F is new UC (S_F, Float);
103 function To_I is new UC (S_I, Integer);
104 function To_LF is new UC (S_LF, Long_Float);
105 function To_LI is new UC (S_LI, Long_Integer);
106 function To_LLF is new UC (S_LLF, Long_Long_Float);
107 function To_LLI is new UC (S_LLI, Long_Long_Integer);
108 function To_LLU is new UC (S_LLU, UST.Long_Long_Unsigned);
109 function To_LU is new UC (S_LU, UST.Long_Unsigned);
110 function To_SF is new UC (S_SF, Short_Float);
111 function To_SI is new UC (S_SI, Short_Integer);
112 function To_SSI is new UC (S_SSI, Short_Short_Integer);
113 function To_SSU is new UC (S_SSU, UST.Short_Short_Unsigned);
114 function To_SU is new UC (S_SU, UST.Short_Unsigned);
115 function To_U is new UC (S_U, UST.Unsigned);
116 function To_WC is new UC (S_WC, Wide_Character);
122 function I_AD (Stream : not null access RST) return Fat_Pointer is
127 Ada.Streams.Read (Stream.all, T, L);
140 function I_AS (Stream : not null access RST) return Thin_Pointer is
145 Ada.Streams.Read (Stream.all, T, L);
158 function I_B (Stream : not null access RST) return Boolean is
163 Ada.Streams.Read (Stream.all, T, L);
168 return Boolean'Val (T (1));
176 function I_C (Stream : not null access RST) return Character is
181 Ada.Streams.Read (Stream.all, T, L);
186 return Character'Val (T (1));
194 function I_F (Stream : not null access RST) return Float is
199 Ada.Streams.Read (Stream.all, T, L);
212 function I_I (Stream : not null access RST) return Integer is
217 Ada.Streams.Read (Stream.all, T, L);
230 function I_LF (Stream : not null access RST) return Long_Float is
235 Ada.Streams.Read (Stream.all, T, L);
248 function I_LI (Stream : not null access RST) return Long_Integer is
253 Ada.Streams.Read (Stream.all, T, L);
266 function I_LLF (Stream : not null access RST) return Long_Long_Float is
271 Ada.Streams.Read (Stream.all, T, L);
284 function I_LLI (Stream : not null access RST) return Long_Long_Integer is
289 Ada.Streams.Read (Stream.all, T, L);
303 (Stream : not null access RST) return UST.Long_Long_Unsigned
309 Ada.Streams.Read (Stream.all, T, L);
322 function I_LU (Stream : not null access RST) return UST.Long_Unsigned is
327 Ada.Streams.Read (Stream.all, T, L);
340 function I_SF (Stream : not null access RST) return Short_Float is
345 Ada.Streams.Read (Stream.all, T, L);
358 function I_SI (Stream : not null access RST) return Short_Integer is
363 Ada.Streams.Read (Stream.all, T, L);
376 function I_SSI (Stream : not null access RST) return Short_Short_Integer is
381 Ada.Streams.Read (Stream.all, T, L);
395 (Stream : not null access RST) return UST.Short_Short_Unsigned
401 Ada.Streams.Read (Stream.all, T, L);
414 function I_SU (Stream : not null access RST) return UST.Short_Unsigned is
419 Ada.Streams.Read (Stream.all, T, L);
432 function I_U (Stream : not null access RST) return UST.Unsigned is
437 Ada.Streams.Read (Stream.all, T, L);
450 function I_WC (Stream : not null access RST) return Wide_Character is
455 Ada.Streams.Read (Stream.all, T, L);
468 procedure W_AD (Stream : not null access RST; Item : Fat_Pointer) is
469 T : constant S_AD := From_AD (Item);
471 Ada.Streams.Write (Stream.all, T);
478 procedure W_AS (Stream : not null access RST; Item : Thin_Pointer) is
479 T : constant S_AS := From_AS (Item);
481 Ada.Streams.Write (Stream.all, T);
488 procedure W_B (Stream : not null access RST; Item : Boolean) is
491 T (1) := Boolean'Pos (Item);
492 Ada.Streams.Write (Stream.all, T);
499 procedure W_C (Stream : not null access RST; Item : Character) is
502 T (1) := Character'Pos (Item);
503 Ada.Streams.Write (Stream.all, T);
510 procedure W_F (Stream : not null access RST; Item : Float) is
511 T : constant S_F := From_F (Item);
513 Ada.Streams.Write (Stream.all, T);
520 procedure W_I (Stream : not null access RST; Item : Integer) is
521 T : constant S_I := From_I (Item);
523 Ada.Streams.Write (Stream.all, T);
530 procedure W_LF (Stream : not null access RST; Item : Long_Float) is
531 T : constant S_LF := From_LF (Item);
533 Ada.Streams.Write (Stream.all, T);
540 procedure W_LI (Stream : not null access RST; Item : Long_Integer) is
541 T : constant S_LI := From_LI (Item);
543 Ada.Streams.Write (Stream.all, T);
550 procedure W_LLF (Stream : not null access RST; Item : Long_Long_Float) is
551 T : constant S_LLF := From_LLF (Item);
553 Ada.Streams.Write (Stream.all, T);
561 (Stream : not null access RST; Item : Long_Long_Integer)
563 T : constant S_LLI := From_LLI (Item);
565 Ada.Streams.Write (Stream.all, T);
573 (Stream : not null access RST; Item : UST.Long_Long_Unsigned)
575 T : constant S_LLU := From_LLU (Item);
577 Ada.Streams.Write (Stream.all, T);
585 (Stream : not null access RST; Item : UST.Long_Unsigned)
587 T : constant S_LU := From_LU (Item);
589 Ada.Streams.Write (Stream.all, T);
596 procedure W_SF (Stream : not null access RST; Item : Short_Float) is
597 T : constant S_SF := From_SF (Item);
599 Ada.Streams.Write (Stream.all, T);
606 procedure W_SI (Stream : not null access RST; Item : Short_Integer) is
607 T : constant S_SI := From_SI (Item);
609 Ada.Streams.Write (Stream.all, T);
617 (Stream : not null access RST; Item : Short_Short_Integer)
619 T : constant S_SSI := From_SSI (Item);
621 Ada.Streams.Write (Stream.all, T);
629 (Stream : not null access RST; Item : UST.Short_Short_Unsigned)
631 T : constant S_SSU := From_SSU (Item);
633 Ada.Streams.Write (Stream.all, T);
641 (Stream : not null access RST; Item : UST.Short_Unsigned)
643 T : constant S_SU := From_SU (Item);
645 Ada.Streams.Write (Stream.all, T);
652 procedure W_U (Stream : not null access RST; Item : UST.Unsigned) is
653 T : constant S_U := From_U (Item);
655 Ada.Streams.Write (Stream.all, T);
662 procedure W_WC (Stream : not null access RST; Item : Wide_Character) is
663 T : constant S_WC := From_WC (Item);
665 Ada.Streams.Write (Stream.all, T);
668 end System.Stream_Attributes;