| ------------------------------------------------------------------------------ |
| -- -- |
| -- 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) 1992-2010, 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, and s-stratt-xdr.adb, which is based on the XDR |
| -- standard. Both bodies share the same spec. The role of this function is |
| -- to indicate whether the current version of System.Stream_Attributes |
| -- supports 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; |
