87 lines
2.2 KiB
Ada
87 lines
2.2 KiB
Ada
with Interfaces.C;
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with H2.Pool;
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separate (H2.Sysapi)
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package body File is
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package C renames Interfaces.C;
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use type C.int;
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--function sys_open (path: ; flags: C.int; mode: C.int) return C.int;
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function sys_open (path: Slim_String; flags: C.int; mode: C.int) return C.int;
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pragma Import (C, sys_open, "open");
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procedure sys_close (fd: C.int);
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pragma Import (C, sys_close, "close");
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INVALID_HANDLE: constant C.int := -1;
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type Posix_File_Record is new File_Record with record
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Pool: Storage_Pool_Pointer := null;
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Handle: C.int := INVALID_HANDLE;
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end record;
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type Posix_File_Pointer is access all Posix_File_Record;
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function Flag_To_System (Bits: in File_Flag_Bits) return C.int is
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V: C.int := 0;
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begin
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-- if Bits and File_Flag_Read /= 0 then
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-- V := V or 0;
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-- end if;
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-- if Bits and File_Flag_Write /= 0 then
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-- V := V or 1;
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-- end if;
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return V;
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end Flag_To_System;
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procedure Open (File: out File_Pointer;
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Name: in Slim_String;
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Flag: in File_Flag;
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Mode: in File_Mode := DEFAULT_FILE_MODE;
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Pool: in Storage_Pool_Pointer := null) is
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package P is new H2.Pool (Posix_File_Record, Posix_File_Pointer, Pool);
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F: Posix_File_Pointer;
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begin
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F := P.Allocate;
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F.Pool := Pool;
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--F.Handle := sys_open (Interfaces.C.char_array(Name & Slim.Character'Val(0)), 0, 0);
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F.Handle := sys_open (Name, Flag_To_System(Flag.Bits), C.int(Mode.Bits));
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if F.Handle <= -1 then
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raise Constraint_Error; -- TODO: raise a proper exception.
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end if;
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File := File_Pointer(F);
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end Open;
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procedure Open (File: out File_Pointer;
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Name: in Wide_String;
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Flag: in File_Flag;
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Mode: in File_Mode := DEFAULT_FILE_MODE;
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Pool: in Storage_Pool_Pointer := null) is
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begin
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Open (File, Wide_To_Slim(Name), Flag, Mode, Pool);
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end Open;
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procedure Close (File: in out File_Pointer) is
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F: Posix_File_Pointer;
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begin
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F := Posix_File_Pointer(File);
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sys_close (F.Handle);
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F.Handle := Interfaces.C."-"(1);
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declare
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package P is new H2.Pool (Posix_File_Record, Posix_File_Pointer, F.Pool);
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begin
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P.Deallocate (F);
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end;
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File := null;
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end Close;
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end File;
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