Skip to content

@nathanpc /get_comp.asm
Created

Embed URL

HTTPS clone URL

Subversion checkout URL

You can clone with
or
.
Download ZIP
Getting And Comparing Input
; How to call it from the program
main:
call getinput
mov si, buffer
cmp byte[si], 0 ; Blank line
je main ; Ignore it
mov si, buffer
mov di, cmd_help ; Input compare: help
call strcmp
jc .help
mov si, buffer
mov di, cmd_hello ; Input compare: hello
call strcmp
jc .hello
mov si, err_cmd ; input entered is invalid
call printf
jmp main ; Infinity loop
.hello:
mov si, msg_hello
call printf
jmp main
.help:
mov si, msg_help
call printf
jmp main
; The function
getinput:
xor cl, cl
.loop:
mov ah, 00h
int 16h ; Key press wait
cmp al, 08h ; Backspace key
je .backspace ; Handle
cmp al, 0dh ; Enter key
je .enter ; Handle
cmp cl, 3fh ; Inputted 63 characters
je .loop ; Only backspace and enter are accepted
mov ah, 0eh
int 10h
stosb
inc cl
jmp .loop
.backspace:
cmp cl, 0 ; Begin of the input
je .loop ; Ignore
dec di
mov byte[di], 0 ; Delete character
dec cl ; Decrementing the string counter
mov ah, 0eh
mov al, 08h
int 10h ; Print the backspace
mov al, ' '
int 10h ; Blank character
mov al, 08h
int 10h ; Backspace one more time
jmp .loop ; Goes back to the loop
.enter:
mov al, 0 ; Null terminator
stosb
mov ah, 0eh
mov al, 0dh ; Enter character
int 10h
mov al, 0ah ; Newline character
int 10h
ret
strcmp:
.loop:
mov al, [si] ; Grab byte from SI
mov bl, [di] ; Grab byte from DI
cmp al, bl ; Compare if they are equal
jne .notequal ; They aren't equal
cmp al, 0 ; Both bytes are null
je .done
inc di ; Increment DI
inc si ; Increment SI
jmp .loop ; Start looping
.notequal:
clc ; Clear the carry flag
ret
.done:
stc ; Set the carry flag
ret
printf:
lodsb
mov ah, 0eh
mov bh, 99h
.nextchar:
lodsb
or al, al
jz .return
int 10h
jmp .nextchar
.return:
ret
cmd_help db "help", 0
msg_help db " Get help on our forums! :D", 0dh, 0ah, 0
cmd_hello db "hello", 0
msg_hello db " Hi all from Dream.In.Code!", 0dh, 0ah, 0
err_msg db "Input don't have any to compare.", 0dh, 0ah, 0
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
Something went wrong with that request. Please try again.