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MEMCPYB.ASM
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Assembly Source File
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1992-01-25
|
2KB
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68 lines
name memcpyb ; copy a string of memory one byte at a time
ARGDO equ word ptr [bp+06h]
ARGDS equ word ptr [bp+08h]
ARGSO equ word ptr [bp+0ah]
ARGSS equ word ptr [bp+0ch]
ARGN equ word ptr [bp+0eh]
MEMB_TEXT segment byte public 'CODE'
public _memcpyb
assume cs:MEMB_TEXT
_memcpyb proc far
push bp
mov bp,sp
push si
push di
push ds
pushf
cld ; top to bottom move
mov ax,ARGDS
mov es,ax
mov ax,ARGSS
mov ds,ax
mov ax,ARGDO
mov di,ax
mov si,ARGSO
mov cx,ARGN
rep movsb
mov dx,es
popf
pop ds
pop di
pop si
pop bp
ret
_memcpyb endp
public _memcpybr
assume cs:MEMB_TEXT
_memcpybr proc far
push bp
mov bp,sp
push si
push di
push ds
pushf
std ; bottom to top move
mov ax,ARGDS
mov es,ax
mov ax,ARGSS
mov ds,ax
mov ax,ARGDO
mov di,ax
mov si,ARGSO
mov cx,ARGN
rep movsb
mov dx,es
popf
pop ds
pop di
pop si
pop bp
ret
_memcpybr endp
MEMB_TEXT ends
end