;Prompt user for input string up to 10 chars, echo back to user
;all storage on stack
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
         .model small
	 .586
         .stack 100h    ;Set maximum stack size to 256 bytes


          .data 
msg       db "Enter String (max 10 char): ",'$'




          .code
START:    mov ax, @data        ;ax <-- data segment start address
          mov ds, ax                  ;ds <-- initialize data segment register
	  mov dx, offset msg   
          mov ah,09
	  int 21h
	  mov ax,0ah		; max characters
	  call mecho
          mov ax, 4c00h               ;ax <-- 4c DOS 21h program halt function
          int 21h                     ;DOS service interrupt


mecho	proc
	push  ds	;; save ds on stack since we want to use stack segment for storage
	push  ax	;; save ax
	enter 0,0
	mov   ax,ss
	mov   ds,ax	;;  point data seg at stack seg
	mov   ax,[bp+2] ;; restore ax
	add ax,2	;; add two more bytes for size, returned length
	sub sp, ax	;; allocate space on stack for string
	mov dx,sp
	mov si,sp       ;; point dx,si at storage area
	mov [si],al	;; set up maximum size
	mov ah,0ah
	int 21h		;; get string from user
	call pcrlf
	mov cl,[si+1]   ;; get characters entered
	xor ch,ch       ;; cx = char count
	add si,2	;; point si at start of string
lp:	lodsb           ;; get byte
	call pchar      ;; print it out
	loop lp
	leave           ;; restore bp
	pop ax          ;; restore ax
	pop ds          ;; restore ds
	ret
mecho    endp

pcrlf   proc            ;; print out crlf
	mov ah,2
	mov dl, 0ah
	int 21h
	mov dl, 0dh
	int 21h
	ret
pcrlf   endp

pchar   proc           ;; print char in al
	mov dl,al
	mov ah,2
	int 21h
	ret
pchar   endp

END       START


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