1------------------------------------------------------------------------------ 2-- -- 3-- GNAT RUN-TIME COMPONENTS -- 4-- -- 5-- S Y S T E M . S T R E A M _ A T T R I B U T E S -- 6-- -- 7-- S p e c -- 8-- -- 9-- Copyright (C) 1992-2013, Free Software Foundation, Inc. -- 10-- -- 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 3, 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. -- 17-- -- 18-- As a special exception under Section 7 of GPL version 3, you are granted -- 19-- additional permissions described in the GCC Runtime Library Exception, -- 20-- version 3.1, as published by the Free Software Foundation. -- 21-- -- 22-- You should have received a copy of the GNU General Public License and -- 23-- a copy of the GCC Runtime Library Exception along with this program; -- 24-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see -- 25-- <http://www.gnu.org/licenses/>. -- 26-- -- 27-- GNAT was originally developed by the GNAT team at New York University. -- 28-- Extensive contributions were provided by Ada Core Technologies Inc. -- 29-- -- 30------------------------------------------------------------------------------ 31 32-- This package contains the implementations of the stream attributes for 33-- elementary types. These are the subprograms that are directly accessed 34-- by occurrences of the stream attributes where the type is elementary. 35 36-- We only provide the subprograms for the standard base types. For user 37-- defined types, the subprogram for the corresponding root type is called 38-- with an appropriate conversion. 39 40with System; 41with System.Unsigned_Types; 42with Ada.Streams; 43 44package System.Stream_Attributes is 45 pragma Preelaborate; 46 47 pragma Suppress (Accessibility_Check, Stream_Attributes); 48 -- No need to check accessibility on arguments of subprograms 49 50 package UST renames System.Unsigned_Types; 51 52 subtype RST is Ada.Streams.Root_Stream_Type'Class; 53 54 subtype SEC is Ada.Streams.Stream_Element_Count; 55 56 -- Enumeration types are usually transferred using the routine for the 57 -- corresponding integer. The exception is that special routines are 58 -- provided for Boolean and the character types, in case the protocol 59 -- in use provides specially for these types. 60 61 -- Access types use either a thin pointer (single address) or fat pointer 62 -- (double address) form. The following types are used to hold access 63 -- values using unchecked conversions. 64 65 type Thin_Pointer is record 66 P1 : System.Address; 67 end record; 68 69 type Fat_Pointer is record 70 P1 : System.Address; 71 P2 : System.Address; 72 end record; 73 74 ------------------------------------ 75 -- Treatment of enumeration types -- 76 ------------------------------------ 77 78 -- In this interface, there are no specific routines for general input 79 -- or output of enumeration types. Generally, enumeration types whose 80 -- representation is unsigned (no negative representation values) are 81 -- treated as unsigned integers, and enumeration types that do have 82 -- negative representation values are treated as signed integers. 83 84 -- An exception is that there are specialized routines for Boolean, 85 -- Character, and Wide_Character types, but these specialized routines 86 -- are used only if the type in question has a standard representation. 87 -- For the case of a non-standard representation (one where the size of 88 -- the first subtype is specified, or where an enumeration representation 89 -- clause is given, these three types are treated like any other cases 90 -- of enumeration types, as described above. 91 92 --------------------- 93 -- Input Functions -- 94 --------------------- 95 96 -- Functions for S'Input attribute. These functions are also used for 97 -- S'Read, with the obvious transformation, since the input operation 98 -- is the same for all elementary types (no bounds or discriminants 99 -- are involved). 100 101 function I_AD (Stream : not null access RST) return Fat_Pointer; 102 function I_AS (Stream : not null access RST) return Thin_Pointer; 103 function I_B (Stream : not null access RST) return Boolean; 104 function I_C (Stream : not null access RST) return Character; 105 function I_F (Stream : not null access RST) return Float; 106 function I_I (Stream : not null access RST) return Integer; 107 function I_LF (Stream : not null access RST) return Long_Float; 108 function I_LI (Stream : not null access RST) return Long_Integer; 109 function I_LLF (Stream : not null access RST) return Long_Long_Float; 110 function I_LLI (Stream : not null access RST) return Long_Long_Integer; 111 function I_LLU (Stream : not null access RST) return UST.Long_Long_Unsigned; 112 function I_LU (Stream : not null access RST) return UST.Long_Unsigned; 113 function I_SF (Stream : not null access RST) return Short_Float; 114 function I_SI (Stream : not null access RST) return Short_Integer; 115 function I_SSI (Stream : not null access RST) return Short_Short_Integer; 116 function I_SSU (Stream : not null access RST) return 117 UST.Short_Short_Unsigned; 118 function I_SU (Stream : not null access RST) return UST.Short_Unsigned; 119 function I_U (Stream : not null access RST) return UST.Unsigned; 120 function I_WC (Stream : not null access RST) return Wide_Character; 121 function I_WWC (Stream : not null access RST) return Wide_Wide_Character; 122 123 ----------------------- 124 -- Output Procedures -- 125 ----------------------- 126 127 -- Procedures for S'Write attribute. These procedures are also used for 128 -- 'Output, since for elementary types there is no difference between 129 -- 'Write and 'Output because there are no discriminants or bounds to 130 -- be written. 131 132 procedure W_AD (Stream : not null access RST; Item : Fat_Pointer); 133 procedure W_AS (Stream : not null access RST; Item : Thin_Pointer); 134 procedure W_B (Stream : not null access RST; Item : Boolean); 135 procedure W_C (Stream : not null access RST; Item : Character); 136 procedure W_F (Stream : not null access RST; Item : Float); 137 procedure W_I (Stream : not null access RST; Item : Integer); 138 procedure W_LF (Stream : not null access RST; Item : Long_Float); 139 procedure W_LI (Stream : not null access RST; Item : Long_Integer); 140 procedure W_LLF (Stream : not null access RST; Item : Long_Long_Float); 141 procedure W_LLI (Stream : not null access RST; Item : Long_Long_Integer); 142 procedure W_LLU (Stream : not null access RST; Item : 143 UST.Long_Long_Unsigned); 144 procedure W_LU (Stream : not null access RST; Item : UST.Long_Unsigned); 145 procedure W_SF (Stream : not null access RST; Item : Short_Float); 146 procedure W_SI (Stream : not null access RST; Item : Short_Integer); 147 procedure W_SSI (Stream : not null access RST; Item : Short_Short_Integer); 148 procedure W_SSU (Stream : not null access RST; Item : 149 UST.Short_Short_Unsigned); 150 procedure W_SU (Stream : not null access RST; Item : UST.Short_Unsigned); 151 procedure W_U (Stream : not null access RST; Item : UST.Unsigned); 152 procedure W_WC (Stream : not null access RST; Item : Wide_Character); 153 procedure W_WWC (Stream : not null access RST; Item : Wide_Wide_Character); 154 155 function Block_IO_OK return Boolean; 156 -- Package System.Stream_Attributes has several bodies - the default one 157 -- distributed with GNAT, and s-stratt-xdr.adb, which is based on the XDR 158 -- standard. Both bodies share the same spec. The role of this function is 159 -- to indicate whether the current version of System.Stream_Attributes 160 -- supports block IO. See System.Strings.Stream_Ops (s-ststop) for details. 161 162private 163 pragma Inline (I_AD); 164 pragma Inline (I_AS); 165 pragma Inline (I_B); 166 pragma Inline (I_C); 167 pragma Inline (I_F); 168 pragma Inline (I_I); 169 pragma Inline (I_LF); 170 pragma Inline (I_LI); 171 pragma Inline (I_LLF); 172 pragma Inline (I_LLI); 173 pragma Inline (I_LLU); 174 pragma Inline (I_LU); 175 pragma Inline (I_SF); 176 pragma Inline (I_SI); 177 pragma Inline (I_SSI); 178 pragma Inline (I_SSU); 179 pragma Inline (I_SU); 180 pragma Inline (I_U); 181 pragma Inline (I_WC); 182 pragma Inline (I_WWC); 183 184 pragma Inline (W_AD); 185 pragma Inline (W_AS); 186 pragma Inline (W_B); 187 pragma Inline (W_C); 188 pragma Inline (W_F); 189 pragma Inline (W_I); 190 pragma Inline (W_LF); 191 pragma Inline (W_LI); 192 pragma Inline (W_LLF); 193 pragma Inline (W_LLI); 194 pragma Inline (W_LLU); 195 pragma Inline (W_LU); 196 pragma Inline (W_SF); 197 pragma Inline (W_SI); 198 pragma Inline (W_SSI); 199 pragma Inline (W_SSU); 200 pragma Inline (W_SU); 201 pragma Inline (W_U); 202 pragma Inline (W_WC); 203 pragma Inline (W_WWC); 204 205 pragma Inline (Block_IO_OK); 206 207end System.Stream_Attributes; 208