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SETMEM.A
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1985-03-29
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619b
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31 lines
; _setmem.a - set memory block to a value.
; (C) Copyright 1984 Gregory R. Mansfield. - All Rights Reserved.
; G. R. Mansfield. 85/01/16.
; Ver 1.0-5329.
cseg
public _setmem_
; _setmem(a, n, v) /* set block to value */
; SEGSIZE n; /* number of bytes to set */
; BYTE *a, v; /* source, destination */
_setmem_:
mov bx,sp
stm1: mov cx,[bx+4] ; count
jcxz stm3 ; if nothing to store
push es
mov ax,[bx+6] ; value
mov di,[bx+2] ; destination offset
push ds
pop es
mov ah,al
shr cx,1 ; store words
repz stosw
jnb stm2 ; store remaining byte
stosb
stm2: pop es
stm3: ret