Question

Language: ARM assembly

Need help writing a program that takes user input as a string and outputs the string with all the vowels replaced with "x". For example, the string "Robot" should output ""Rxbxt"

Answer 1

DATA
prompt1 BYTE "String to Search: ", 0
prompt2 BYTE "Word to Search For: ", 0
prompt3 BYTE "Word to replace with: ", 0
target BYTE 80 DUP (?)
key BYTE 80 DUP (?)
strSub BYTE 80 DUP (?)
trgtLength DWORD ?
keyLength DWORD ?
lastPosn DWORD ?
strSubLen DWORD ?
resultLbl BYTE "The new sentence is: ", 0

.CODE
_MainProc PROC
input prompt1, target, 80 ;input target string
lea eax, target ;address of target
push eax ;parameter
call strlen ;strlen(target)
add esp, 4 ;remove parameter
mov trgtLength, eax ;save length of target
input prompt2, key, 80 ;input key string
lea eax, key ;address of key
push eax ;parameter
call strlen ;strlen(key)
add esp, 4 ;remove parameter
mov keyLength, eax ;save length of key
input prompt3, strSub, 80 ;input word to search for
lea eax, strSub ;address of key
push eax ;parameter
call strlen ;strlen(strSub)
add esp, 4 ;remove parameter
mov strSubLen, eax ;save length of key

mov eax, trgtLength
sub eax, keyLength
inc eax ;trgtLength - keyLength +1
mov lastPosn, eax
cld ;Left to Right comparison
mov eax, 1 ;starting position

whilePosn:
cmp eax, lastPosn ;position <= last_posn?
jnle endWhilePosn ;exit if past last position

lea esi, target ;address of target string
add esi, eax ;add position
dec esi ;address of position to check
lea edi, key ;address of key
mov ecx, keyLength ;number of position to check
repe cmpsb ;check
jz found ;exit of success
inc eax ;increment position
jmp whilePosn ;repeat

endWhilePosn:
output resultLbl, [esi] ;display new sentence
jmp quit

found:
sub edi, keyLength
mov ecx, strSubLen
lea esi, strSub
cld
rep movsb
inc eax
jmp whilePosn

quit:
mov eax, 0 ; exit with return code 0
ret
_MainProc ENDP

strlen PROC
push ebp ;establish stack frame
mov ebp, esp
push ebx ;save EBX
sub eax, eax ;length := 0
mov ebx, [ebp+8] ;address of string

whileChar:
cmp BYTE PTR [ebx], 0 ;null byte?
je endWhileChar ;exit if so
inc eax ;increment length
inc ebx ;point at next character
jmp whileChar ;repeat

endWhileChar:
pop ebx ;restore registers
pop ebp
ret
strlen ENDP
END