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memid.asm
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Assembly Source File
|
1991-02-05
|
1KB
|
70 lines
NAME memid
include tomlib.equ
;-----------------------------------------------------
; memid(near *dest,near *src)
; return number of equal bytes
; {
; register int loop;
; for (loop = 0; *dest++ == *src++; loop++)
; ;
; return loop;
; }
;
;
;
;------------------------------------------------------
TEXTSEGMENT
PUBPROC _memid
;------------------------------------------------------------------------------
mov dx,di ; protect DI && SI
mov bx,si
mov si,sp
mov ax,ds
mov es,ax
mov di,(2+SPOFF)[si]
mov si,(4+SPOFF)[si]
mov cx,0ffffh
cld
repe cmpsb
mov ax,-2
sub ax,cx
mov di,dx
mov si,bx
ret
;------------------------------------------------------------------------------
_memid endp
PUBPROC @memid ; registers in AX,BX
;------------------------------------------------------------------------------
xchg ax,si
xchg bx,di ; protect DI && SI
mov cx,ds
mov es,cx
mov cx,0ffffh
cld
repe cmpsb
xchg ax,si
xchg bx,di ; unprotect DI && SI
mov ax,-2
sub ax,cx
ret
;------------------------------------------------------------------------------
@memid endp
TEXTEND
end