AssemblyFall2014/Worksheet7-2.txt at master · Amanda1223/AssemblyFall2014 · GitHub

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TITLE Worksheet7

; Description: Solution for worksheet 7 number 2
; Author: Amanda Steidl
; Date: Nov. 4, 2014
; Worksheet7-2.asm
INCLUDE Irvine32.inc

.data
string BYTE "The quick brown fox jumps over the lazy dog.", 0

.code
main Proc

;Set up portable procedure

MOV ESI, OFFSET string

CALL diagonal
Call Crlf


exit
main ENDP

;--------------------------------------------------------------------------------------
printDiagonal PROC
; Description: Takes the string, and assembles the words in a diagnol pattern across
;	the screen...
; Recieves: ESI = the OFFSET of the string (str).
; Returns : nothing.
;--------------------------------------------------------------------------------------
PUSHAD

;will start from top left corner...
;use AL for writeChar...
;first clear screen
Call ClrScr

Top:						;start loop		[Top]
MOV AL, [ESI]				;parse through string character by character
CMP AL, 0
  JE ExitProc				;exit procedure only taken when reached null byte
CMP AL, 20h					;20h is the 'space' character
  JE next_Line				;if equal to 20h, then move to next line and indent
Call WriteChar
INC ESI
  JMP Top					;keep writing characters until conditions are met
next_Line:
   INC DL					;remember DL is 'X', DH is 'Y'
   INC DH					;increase both for DL to go right, and DH to go down
   Call Gotoxy				;Gotoxy to move the cursor
   INC ESI					;increase esi to go to next char
  JMP Top
ExitProc:

POPAD

RET
printDiagonal ENDP

end main