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Question in Assembly Language

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Hey, I have to write a program, and yes it is for a class, that just reverses a string using a Palindrome. I was just wondering if anyone could help me understand how to make my call to ReadString write into my BYTE buffer.

I call ReadString and for some reason its not writing it into the data i want it to. I understand if no one wants to help me because it is for a class but I was just wondering. I understand how to do most of this I just must be missing a statement or two?

I'm just confused...thank you much.

TITLE Palindrome    (Palindrome.asm)

; Palindrome.asm -- Create a program that gets a sentence from the user.
; The program then uses a stack to reverse the string and print
; the reversed string out.

INCLUDE Irvine32.inc

CR EQU 0Dh ; ASCII Carriage Return Character
LF EQU 0Ah ; ASCII Line Feed Character
EOS EQU 0h ; Zero-terminated

strPrompt BYTE "Please enter a string to be reversed...", CR, LF, EOS
buffer BYTE 20 DUP( "#" ), EOS
target BYTE ?

main PROC

; procedure to get input
mov edx, OFFSET strPrompt ;print heading
call WriteString
call getInput
call showOutput

main ENDP

getInput PROC


mov edx, OFFSET buffer
mov ecx, SIZEOF buffer
call ReadString

mov esi, 0

movzx eax, buffer[esi]
push eax
inc esi
;call DumpRegs
loop L1

mov ecx, SIZEOF buffer
mov esi, 0

pop eax
mov buffer[esi], al
inc esi
loop L2

getInput ENDP
showOutput PROC


;print reversed string
mov edx, OFFSET buffer
call WriteString

showOutput ENDP
END main ;ends with main as starting procedure

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