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|
{
System independent filecontrol interface for tp7
$Id: filectrl.inc,v 1.1 1998/12/04 12:48:57 peter Exp $
}
{ no known 16 bit compilers support overriding }
function OpenFileStr(FName: PChar; Flags: Longint): TFileHandle; assembler;
asm
@@Retry:
push ds
lds dx,FName
mov al,byte ptr Flags
mov ah,3dh
int 21h
pop ds
jnc @@1
push ax
mov ax,0
push ax { ErrorCode: Longint }
les dx,FName
push es
push dx { FName as ErrorInfo }
call [ErrorHandler]
cmp ax,errRetry
je @@Retry
mov ax,-1
@@1:
end;
function CreateFileStr(FName: PChar): TFileHandle; assembler;
asm
@@Retry:
push ds
lds dx,FName
mov cl,20h
xor ch,ch
mov ah,3Ch
int 21h
pop ds
jnc @@1
push ax
mov ax,0
push ax
les dx,FName
push es
push dx { FName as errorinfo }
call [ErrorHandler]
cmp ax,errRetry
je @@Retry
mov ax,-1
@@1:
end;
procedure DeleteFileStr(FName: PChar); assembler;
asm
@@Retry:
push ds
lds dx,FName
mov AH,41h
int 21h
pop ds
jnc @@1
push ax
mov ax,0
push ax
les dx,FName
push es
push dx
call [ErrorHandler]
cmp ax,errRetry
je @@Retry
@@1:
end;
procedure CloseFile(Handle: TFileHandle); assembler;
asm
@@Retry:
mov bx,Handle
mov ah,3eh
int 21h
jnc @@1
push ax
mov ax,0
push ax
push ax
push ax
call [ErrorHandler]
cmp ax,errRetry
je @@Retry
@@1:
end;
function SeekFile(Handle: TFileHandle; Pos: TFileInt; SeekType: Word): TFileInt; assembler;
asm
@@Retry:
mov ah,42H
mov bx,Handle
mov dx,word ptr Pos[0]
mov cx,word ptr Pos[2]
mov al,byte ptr SeekType
int 21h
jnc @@1
push ax
mov ax,0
push ax
push ax
push ax
call [ErrorHandler]
cmp ax,errRetry
je @@Retry
mov ax,-1
mov dx,-1
@@1:
end;
function ReadFile(Handle: TFileHandle; var Buff; Count: CPUWord): CPUWord; assembler;
asm
@@Retry:
push ds
lds dx,Buff
mov cx,Count
mov bx,Handle
mov ah,3fh
int 21h
pop ds
jnc @@1
push ax
mov ax,0
push ax
push ax
push ax
call [ErrorHandler]
cmp ax,errRetry
je @@Retry
xor ax,ax
@@1:
end;
function WriteFile(Handle: TFileHandle; var Buff; Count: CPUWord): CPUWord; assembler;
asm
@@Retry:
push ds
lds dx,Buff
mov cx,Count
mov bx,Handle
mov ah,40h
int 21h
pop ds
jnc @@1
push ax
mov ax,0
push ax
push ax
push ax
call [ErrorHandler]
cmp ax,errRetry
je @@Retry
xor ax,ax
@@1:
end;
procedure FlushFile(Handle: TFileHandle); assembler;
asm
@@Retry:
mov bx,Handle
mov ah,68H
int 21h
jnc @@1
push ax
mov ax,0
push ax
push ax
push ax
call [ErrorHandler]
cmp ax,errRetry
je @@Retry
@@1:
end;
procedure TruncateFile(Handle: TFileHandle);
begin
WriteFile(Handle, Handle, 0);
end;
function EndOfFile(Handle: TFileHandle): Boolean; assembler;
asm
@@Retry:
mov ax,4400h
mov bx,Handle
int 21h
jnc @@1
push ax
mov ax,0
push ax
push ax
push ax
call [ErrorHandler]
cmp ax,errRetry
je @@Retry
jmp @@3 { Set result to 1, though an error has happened }
@@1:
test ax,40h
jz @@3
xor al,al
jmp @@2
@@3:
mov al,1
@@2:
end;
function FilePos(Handle: TFileHandle): TFileInt;
begin
FilePos := SeekFile(Handle, 0, skCur);
end;
function FileSize(Handle: TFileHandle): TFileInt;
var
L: Longint;
begin
L := FilePos(Handle);
FileSize := SeekFile(Handle, 0, skEnd);
SeekFile(Handle, L, skBeg);
end;
{
$Log: filectrl.inc,v $
Revision 1.1 1998/12/04 12:48:57 peter
* moved some dirs
Revision 1.1 1998/10/26 11:31:49 peter
+ inital include files
}
|
