i can't understand how can i read the down arrow input in assembly. I need this input to pass to the next string.

i checked the register ebx and ecx and inside of them there are different values. i tried to initialize a string that contains ^[[B the char that appear when you press down arrow key but when i pres it and then enter , the process go in the lable "sbaglio" it send write "check_olio" and the content of var a that is the new line code.

.section .bss .lcomm a 256

.section .data

Freccia_giu: .string "^[[B"

Freccia_giu_len: .long . - Freccia_giu

_start:

write the first string

movl $4, %eax movl $1 ,%ebx movl $Menu, %ecx mov Menu_len, %edx int $0x80 

interupt call to save the down arrow in a

rileva_freccia: # get down arrow movl $3, %eax movl $0 ,%ebx movl $a, %ecx movl $255, %edx int $0x80 movb $0, (%ecx, %eax, 1) # verifiy down arrow movl $a, %ecx movl $Freccia_giu ,%ebx cmp %ebx ,%ecx jne sbaglio je fine 

#non equity lable sbaglio: movl $4, %eax movl $1 ,%ebx movl $Check_Olio, %ecx mov Check_Olio_len, %edx int $0x80 movl $4, %eax movl $1 ,%ebx movl $a, %ecx mov $256, %edx int $0x80

fine: movl $4, %eax movl $1 ,%ebx movl $Setting_Automobile, %ecx mov Setting_Automobile_len, %edx int $0x80

i can't understand how can i read the down arrow input in assembly. I need this input to pass to the next string.

i checked the register ebx and ecx and inside of them there are different values. i tried to initialize a string that contains ^[[B the char that appear when you press down arrow key but when i pres it and then enter , the process go in the lable "sbaglio" it send write "check_olio" and the content of var a that is the new line code.

.section .bss .lcomm a 256 .section .data Freccia_giu: .string "^[[B" Freccia_giu_len: .long . - Freccia_giu _start: # write the first string movl $4, %eax  movl $1 ,%ebx  movl $Menu, %ecx  mov Menu_len, %edx  int $0x80  # interupt call to save the down arrow in a rileva_freccia:   # get down arrow   movl $3, %eax   movl $0 ,%ebx   movl $a, %ecx   movl $255, %edx   int $0x80   movb $0, (%ecx, %eax, 1)  # verifiy down arrow  movl $a, %ecx  movl $Freccia_giu ,%ebx  cmp %ebx ,%ecx  jne sbaglio  je fine   #non equity lable sbaglio: movl $4, %eax movl $1 ,%ebx movl $Check_Olio, %ecx mov Check_Olio_len, %edx int $0x80 movl $4, %eax movl $1 ,%ebx movl $a, %ecx mov $256, %edx int $0x80 fine: movl $4, %eax movl $1 ,%ebx movl $Setting_Automobile, %ecx mov Setting_Automobile_len, %edx int $0x80