with Interfaces.C_Streams; use Interfaces.C_Streams;
with System;
with System.CRTL;
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);
use type System.CRTL.size_t;
procedure Close (File : in out File_Type) is
begin
FIO.Close (AP (File));
end Close;
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;
procedure Delete (File : in out File_Type) is
begin
FIO.Delete (AP (File));
end Delete;
function End_Of_File (File : in File_Type) return Boolean is
begin
return FIO.End_Of_File (AP (File));
end End_Of_File;
function Form (File : in File_Type) return String is
begin
return FIO.Form (AP (File));
end Form;
function Is_Open (File : in File_Type) return Boolean is
begin
return FIO.Is_Open (AP (File));
end Is_Open;
function Mode (File : in File_Type) return File_Mode is
begin
return To_SIO (FIO.Mode (AP (File)));
end Mode;
function Name (File : in File_Type) return String is
begin
return FIO.Name (AP (File));
end Name;
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;
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));
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);
pragma Extensions_Allowed (On);
if Element_Type'Has_Discriminants
and then Item'Constrained
then
declare
RsizS : constant SSE.Storage_Offset :=
SSE.Storage_Offset (Rsiz - 1);
type SA is new SSE.Storage_Array (0 .. RsizS);
for SA'Alignment use Standard'Maximum_Alignment;
type SAP is access all SA;
type ItemP is access all Element_Type;
pragma Warnings (Off);
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;
if not Element_Type'Has_Discriminants and then Rsiz > Siz then
raise Program_Error;
end if;
FIO.Read_Buf (AP (File), Item'Address, Rsiz);
else
FIO.Read_Buf (AP (File), Item'Address, Siz);
end if;
end Read;
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;
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));
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;