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OFOPENR.ASM
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Assembly Source File
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1989-05-02
|
1KB
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52 lines
; FILENAME: OFOPENR.ASM
; Copyright (c) 1988, 1989 by Borland International, Inc.
;
; Description: This module implements the routine FileOpenR. FileOpenR
; opens a file for reading.
;
; ASSEMBLY INSTRUCTIONS: To assemble this module use the following
; TASM command line.
;
; TASM ofopenr
include globals.inc
_TEXT segment
FileOpenR proc
; Input
; bx - file record offset
; cx - buffer size
; dx - offset of filespec
; Output (of INT 21h, Function 3Dh)
; cf - set if error occurred
; ax - error code
; 1 - if function number invalid (file-sharing must be loaded)
; 2 - if file not found
; 3 - if path not found of file doesn't exist
; 4 - if no handle available
; 5 - if access denied
; 0Ch - if file access code invalid
; Registers modified
; ax
mov WORD PTR [bx+0], 0 ;set status
mov [bx+2], cx ;save size
call FileAlloc ;allocate buffer
jc filopn1 ;jump if error
mov ax, 3d00h ;function and access
int 21h ;execute
mov [bx+8], ax ;save handle
jnc filopn1
call FileFree ;deallocate
stc
filopn1:
ret
FileOpenR endp
_TEXT ends
end