section .data
    minha_string db 'ABCD', 0      ; String com terminador 0
    achou_msg db 'Achou o PWD!', 0xA
    achou_len equ $ - achou_msg
    num db '1'
    char_buffer db 0, 0xA          ; Buffer para armazenar caractere + newline
 
section .text
global _start
 
_start:
    mov esi, minha_string          ; ESI aponta para o início da string
 
procurar:
    mov al, [esi]                  ; pega o byte apontado por ESI
    inc esi
    cmp al, 0                      ; Chegou ao final da string?
    je nao_achou
    cmp al, 'A'                    ; Comparar caractere atual com 'A'
    je achoua
    jmp adiciona_imprime           ; Imprime e depois volta a procurar
 
achoua:
    ; Imprime '1' quando encontra 'A'
    mov eax, 4                     ; sys_write
    mov ebx, 1                     ; stdout
    mov ecx, num                   ; endereço da string
    mov edx, 1                     ; tamanho da string
    int 0x80                       ; chamada de sistema
    jmp procurar
 
adiciona_imprime:
    ; Incrementa o caractere
    inc al
    ; Armazena no buffer
    mov [char_buffer], al
 
    ; Imprime o caractere incrementado
    mov eax, 4                     ; sys_write
    mov ebx, 1                     ; stdout
    mov ecx, char_buffer           ; endereço do buffer
    mov edx, 2                     ; tamanho (caractere + newline)
    int 0x80
 
    jmp procurar
 
nao_achou:
    ; se não quiser fazer nada, apenas sair
    jmp sair
 
sair:
    mov eax, 1                     ; syscall exit
    xor ebx, ebx
    int 0x80

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