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OTABSET.ASM
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Assembly Source File
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1989-05-02
|
1KB
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45 lines
; FILENAME: OTABSET.ASM
; Copyright (c) 1988, 1989 by Borland International, Inc.
;
; Description: This module implements the routine TabSet. TabSet
; sets a tap stop at a specified column location.
; This module uses MASM mode syntax and standard segment directives.
;
; ASSEMBLY INSTRUCTIONS: To assemble this module use the following
; TASM command line.
;
; TASM otabset
include globals.inc
_TEXT segment
TabSet proc
; This procedure sets a tab stop. The value passed in bx
; represents the column number in which the tab is to be placed.
; A tab is represented by the number 1 in the tab table.
; Input
; bx - column number
; TabTbl - starting location of the tab table
; TabEnd - ending location of the tab table
; Output
; TabTbl - cleared and set to null
; Registers modified
; none
push bx
lea bx, [TabTbl + bx] ;get address
cmp bx, TabEnd ;check if past end
jae tabset1
mov BYTE PTR [bx], 1 ;set to non-zero
tabset1:
pop bx
ret
TabSet endp
_TEXT ends
end