209db2bf05
2003-12-15 Robert Dewar <dewar@gnat.com> * exp_ch6.adb (Expand_Thread_Body): Fix error in picking up default sec stack size. 2003-12-15 Vincent Celier <celier@gnat.com> * gnatchop.adb: (Error_Msg): Do not exit on error for a warning (Gnatchop): Do not set failure status when reporting the number of warnings. 2003-12-15 Doug Rupp <rupp@gnat.com> * s-ctrl.ads: New file. * Makefile.rtl (GNAT_RTL_NONTASKING_OBJS): Add s-crtl$(objext). * Make-lang.in: (GNAT_ADA_OBJS): Add ada/s-crtl.o. (GNATBIND_OBJS): Add ada/s-crtl.o. * Makefile.in [VMS]: Clean up ifeq rules. * gnatlink.adb, 6vcstrea.adb, a-direio.adb, a-sequio.adb, a-ststio.adb, a-textio.adb, g-os_lib.adb, a-witeio.adb, g-os_lib.ads, i-cstrea.adb, i-cstrea.ads, s-direio.adb, s-fileio.adb, s-memcop.ads, s-memory.adb, s-stache.adb, s-tasdeb.adb: Update copyright. Import System.CRTL. Make minor modifications to use System.CRTL declared functions instead of importing locally. 2003-12-15 GNAT Script <nobody@gnat.com> * Make-lang.in: Makefile automatically updated From-SVN: r74627
274 lines
8.7 KiB
Ada
274 lines
8.7 KiB
Ada
------------------------------------------------------------------------------
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-- --
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-- GNAT RUNTIME COMPONENTS --
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-- --
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-- A D A . S E Q U E N T I A L _ I O --
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-- --
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-- B o d y --
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-- --
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-- Copyright (C) 1992-2003, Free Software Foundation, Inc. --
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-- --
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-- GNAT is free software; you can redistribute it and/or modify it under --
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-- terms of the GNU General Public License as published by the Free Soft- --
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-- ware Foundation; either version 2, or (at your option) any later ver- --
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-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
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-- for more details. You should have received a copy of the GNU General --
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-- Public License distributed with GNAT; see file COPYING. If not, write --
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-- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
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-- MA 02111-1307, USA. --
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-- --
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-- As a special exception, if other files instantiate generics from this --
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-- unit, or you link this unit with other files to produce an executable, --
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-- this unit does not by itself cause the resulting executable to be --
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-- covered by the GNU General Public License. This exception does not --
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-- however invalidate any other reasons why the executable file might be --
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-- covered by the GNU Public License. --
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-- --
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-- GNAT was originally developed by the GNAT team at New York University. --
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-- Extensive contributions were provided by Ada Core Technologies Inc. --
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-- --
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------------------------------------------------------------------------------
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-- This is the generic template for Sequential_IO, i.e. the code that gets
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-- duplicated. We absolutely minimize this code by either calling routines
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-- in System.File_IO (for common file functions), or in System.Sequential_IO
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-- (for specialized Sequential_IO functions)
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with Interfaces.C_Streams; use Interfaces.C_Streams;
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with System;
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with System.CRTL;
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with System.File_Control_Block;
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with System.File_IO;
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with System.Storage_Elements;
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with Unchecked_Conversion;
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package body Ada.Sequential_IO is
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package FIO renames System.File_IO;
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package FCB renames System.File_Control_Block;
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package SIO renames System.Sequential_IO;
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package SSE renames System.Storage_Elements;
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SU : constant := System.Storage_Unit;
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subtype AP is FCB.AFCB_Ptr;
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subtype FP is SIO.File_Type;
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function To_FCB is new Unchecked_Conversion (File_Mode, FCB.File_Mode);
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function To_SIO is new Unchecked_Conversion (FCB.File_Mode, File_Mode);
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use type System.CRTL.size_t;
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-----------
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-- Close --
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-----------
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procedure Close (File : in out File_Type) is
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begin
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FIO.Close (AP (File));
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end Close;
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------------
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-- Create --
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------------
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procedure Create
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(File : in out File_Type;
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Mode : in File_Mode := Out_File;
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Name : in String := "";
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Form : in String := "")
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is
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begin
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SIO.Create (FP (File), To_FCB (Mode), Name, Form);
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end Create;
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------------
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-- Delete --
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------------
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procedure Delete (File : in out File_Type) is
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begin
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FIO.Delete (AP (File));
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end Delete;
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-----------------
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-- End_Of_File --
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-----------------
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function End_Of_File (File : in File_Type) return Boolean is
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begin
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return FIO.End_Of_File (AP (File));
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end End_Of_File;
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----------
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-- Form --
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----------
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function Form (File : in File_Type) return String is
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begin
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return FIO.Form (AP (File));
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end Form;
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-------------
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-- Is_Open --
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-------------
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function Is_Open (File : in File_Type) return Boolean is
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begin
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return FIO.Is_Open (AP (File));
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end Is_Open;
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----------
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-- Mode --
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----------
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function Mode (File : in File_Type) return File_Mode is
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begin
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return To_SIO (FIO.Mode (AP (File)));
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end Mode;
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----------
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-- Name --
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----------
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function Name (File : in File_Type) return String is
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begin
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return FIO.Name (AP (File));
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end Name;
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----------
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-- Open --
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----------
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procedure Open
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(File : in out File_Type;
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Mode : in File_Mode;
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Name : in String;
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Form : in String := "")
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is
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begin
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SIO.Open (FP (File), To_FCB (Mode), Name, Form);
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end Open;
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----------
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-- Read --
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----------
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procedure Read (File : in File_Type; Item : out Element_Type) is
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Siz : constant size_t := (Item'Size + SU - 1) / SU;
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Rsiz : size_t;
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begin
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FIO.Check_Read_Status (AP (File));
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-- For non-definite type or type with discriminants, read size and
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-- raise Program_Error if it is larger than the size of the item.
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if not Element_Type'Definite
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or else Element_Type'Has_Discriminants
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then
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FIO.Read_Buf
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(AP (File), Rsiz'Address, size_t'Size / System.Storage_Unit);
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-- For a type with discriminants, we have to read into a temporary
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-- buffer if Item is constrained, to check that the discriminants
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-- are correct.
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pragma Extensions_Allowed (On);
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-- Needed to allow Constrained reference here
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if Element_Type'Has_Discriminants
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and then Item'Constrained
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then
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declare
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RsizS : constant SSE.Storage_Offset :=
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SSE.Storage_Offset (Rsiz - 1);
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type SA is new SSE.Storage_Array (0 .. RsizS);
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for SA'Alignment use Standard'Maximum_Alignment;
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-- We will perform an unchecked conversion of a pointer-to-SA
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-- into pointer-to-Element_Type. We need to ensure that the
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-- source is always at least as strictly aligned as the target.
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type SAP is access all SA;
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type ItemP is access all Element_Type;
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pragma Warnings (Off);
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-- We have to turn warnings off for function To_ItemP,
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-- because it gets analyzed for all types, including ones
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-- which can't possibly come this way, and for which the
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-- size of the access types differs.
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function To_ItemP is new Unchecked_Conversion (SAP, ItemP);
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pragma Warnings (On);
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Buffer : aliased SA;
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pragma Unsuppress (Discriminant_Check);
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begin
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FIO.Read_Buf (AP (File), Buffer'Address, Rsiz);
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Item := To_ItemP (Buffer'Access).all;
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return;
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end;
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end if;
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-- In the case of a non-definite type, make sure the length is OK.
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-- We can't do this in the variant record case, because the size is
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-- based on the current discriminant, so may be apparently wrong.
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if not Element_Type'Has_Discriminants and then Rsiz > Siz then
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raise Program_Error;
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end if;
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FIO.Read_Buf (AP (File), Item'Address, Rsiz);
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-- For definite type without discriminants, use actual size of item
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else
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FIO.Read_Buf (AP (File), Item'Address, Siz);
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end if;
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end Read;
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-----------
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-- Reset --
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-----------
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procedure Reset (File : in out File_Type; Mode : in File_Mode) is
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begin
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FIO.Reset (AP (File), To_FCB (Mode));
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end Reset;
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procedure Reset (File : in out File_Type) is
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begin
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FIO.Reset (AP (File));
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end Reset;
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-----------
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-- Write --
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-----------
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procedure Write (File : in File_Type; Item : in Element_Type) is
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Siz : constant size_t := (Item'Size + SU - 1) / SU;
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begin
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FIO.Check_Write_Status (AP (File));
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-- For non-definite types or types with discriminants, write the size
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if not Element_Type'Definite
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or else Element_Type'Has_Discriminants
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then
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FIO.Write_Buf
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(AP (File), Siz'Address, size_t'Size / System.Storage_Unit);
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end if;
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FIO.Write_Buf (AP (File), Item'Address, Siz);
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end Write;
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end Ada.Sequential_IO;
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