+++ /dev/null
-------------------------------------------------------------------------------
--- --
--- GNAT RUNTIME COMPONENTS --
--- --
--- A D A . S E Q U E N T I A L _ I O --
--- --
--- B o d y --
--- --
--- $Revision: 1.1.16.1 $
--- --
--- Copyright (C) 1992-1999, 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 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 --
--- 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 --
--- 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. --
--- --
--- GNAT was originally developed by the GNAT team at New York University. --
--- Extensive contributions were provided by Ada Core Technologies Inc. --
--- --
-------------------------------------------------------------------------------
-
--- This is the generic template for Sequential_IO, i.e. the code that gets
--- duplicated. We absolutely minimize this code by either calling routines
--- in System.File_IO (for common file functions), or in System.Sequential_IO
--- (for specialized Sequential_IO functions)
-
-with Interfaces.C_Streams; use Interfaces.C_Streams;
-with System;
-with System.File_Control_Block;
-with System.File_IO;
-with System.Storage_Elements;
-with Unchecked_Conversion;
-
-package body Ada.Sequential_IO is
-
- package FIO renames System.File_IO;
- package FCB renames System.File_Control_Block;
- package SIO renames System.Sequential_IO;
- package SSE renames System.Storage_Elements;
-
- SU : constant := System.Storage_Unit;
-
- subtype AP is FCB.AFCB_Ptr;
- subtype FP is SIO.File_Type;
-
- function To_FCB is new Unchecked_Conversion (File_Mode, FCB.File_Mode);
- function To_SIO is new Unchecked_Conversion (FCB.File_Mode, File_Mode);
-
- -----------
- -- Close --
- -----------
-
- procedure Close (File : in out File_Type) is
- begin
- FIO.Close (AP (File));
- end Close;
-
- ------------
- -- Create --
- ------------
-
- procedure Create
- (File : in out File_Type;
- Mode : in File_Mode := Out_File;
- Name : in String := "";
- Form : in String := "")
- is
- begin
- SIO.Create (FP (File), To_FCB (Mode), Name, Form);
- end Create;
-
- ------------
- -- Delete --
- ------------
-
- procedure Delete (File : in out File_Type) is
- begin
- FIO.Delete (AP (File));
- end Delete;
-
- -----------------
- -- End_Of_File --
- -----------------
-
- function End_Of_File (File : in File_Type) return Boolean is
- begin
- return FIO.End_Of_File (AP (File));
- end End_Of_File;
-
- ----------
- -- Form --
- ----------
-
- function Form (File : in File_Type) return String is
- begin
- return FIO.Form (AP (File));
- end Form;
-
- -------------
- -- Is_Open --
- -------------
-
- function Is_Open (File : in File_Type) return Boolean is
- begin
- return FIO.Is_Open (AP (File));
- end Is_Open;
-
- ----------
- -- Mode --
- ----------
-
- function Mode (File : in File_Type) return File_Mode is
- begin
- return To_SIO (FIO.Mode (AP (File)));
- end Mode;
-
- ----------
- -- Name --
- ----------
-
- function Name (File : in File_Type) return String is
- begin
- return FIO.Name (AP (File));
- end Name;
-
- ----------
- -- Open --
- ----------
-
- procedure Open
- (File : in out File_Type;
- Mode : in File_Mode;
- Name : in String;
- Form : in String := "")
- is
- begin
- SIO.Open (FP (File), To_FCB (Mode), Name, Form);
- end Open;
-
- ----------
- -- Read --
- ----------
-
- procedure Read (File : in File_Type; Item : out Element_Type) is
- Siz : constant size_t := (Item'Size + SU - 1) / SU;
- Rsiz : size_t;
-
- begin
- FIO.Check_Read_Status (AP (File));
-
- -- For non-definite type or type with discriminants, read size and
- -- raise Program_Error if it is larger than the size of the item.
-
- if not Element_Type'Definite
- or else Element_Type'Has_Discriminants
- then
- FIO.Read_Buf
- (AP (File), Rsiz'Address, size_t'Size / System.Storage_Unit);
-
- -- For a type with discriminants, we have to read into a temporary
- -- buffer if Item is constrained, to check that the discriminants
- -- are correct.
-
- pragma Extensions_Allowed (On);
- -- Needed to allow Constrained reference here
-
- if Element_Type'Has_Discriminants
- and then Item'Constrained
- then
- declare
- RsizS : constant SSE.Storage_Offset :=
- SSE.Storage_Offset (Rsiz - 1);
-
- subtype SA is SSE.Storage_Array (0 .. RsizS);
- type SAP is access all SA;
- type ItemP is access all Element_Type;
-
- pragma Warnings (Off);
- -- We have to turn warnings off for this function, because
- -- it gets analyzed for all types, including ones which
- -- can't possibly come this way, and for which the size
- -- of the access types differs.
-
- function To_ItemP is new Unchecked_Conversion (SAP, ItemP);
-
- pragma Warnings (On);
-
- Buffer : aliased SA;
-
- pragma Unsuppress (Discriminant_Check);
-
- begin
- FIO.Read_Buf (AP (File), Buffer'Address, Rsiz);
- Item := To_ItemP (Buffer'Access).all;
- return;
- end;
- end if;
-
- -- In the case of a non-definite type, make sure the length is OK.
- -- We can't do this in the variant record case, because the size is
- -- based on the current discriminant, so may be apparently wrong.
-
- if not Element_Type'Has_Discriminants and then Rsiz > Siz then
- raise Program_Error;
- end if;
-
- FIO.Read_Buf (AP (File), Item'Address, Rsiz);
-
- -- For definite type without discriminants, use actual size of item
-
- else
- FIO.Read_Buf (AP (File), Item'Address, Siz);
- end if;
- end Read;
-
- -----------
- -- Reset --
- -----------
-
- procedure Reset (File : in out File_Type; Mode : in File_Mode) is
- begin
- FIO.Reset (AP (File), To_FCB (Mode));
- end Reset;
-
- procedure Reset (File : in out File_Type) is
- begin
- FIO.Reset (AP (File));
- end Reset;
-
- -----------
- -- Write --
- -----------
-
- procedure Write (File : in File_Type; Item : in Element_Type) is
- Siz : constant size_t := (Item'Size + SU - 1) / SU;
-
- begin
- FIO.Check_Write_Status (AP (File));
-
- -- For non-definite types or types with discriminants, write the size
-
- if not Element_Type'Definite
- or else Element_Type'Has_Discriminants
- then
- FIO.Write_Buf
- (AP (File), Siz'Address, size_t'Size / System.Storage_Unit);
- end if;
-
- FIO.Write_Buf (AP (File), Item'Address, Siz);
- end Write;
-
-end Ada.Sequential_IO;
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