fibo.asm

%include "nasmx.inc"

ENTRY main
IMPORT fgets
IMPORT printf
IMPORT puts
IMPORT atoi

EXTERN stdin

section .data
  numfmt: db "%d", 0xa, 0
  input_cap: db "Input cap on the fibonacci numbers: ", 0
  fibs: db "Here are the fibonacci numbers up to %d: ", 0
  nullstr: db 0

section .text

; Prints all the fibonacci numbers up to 
PROC fibo, uint32_t capFibos
LOCALS NONE
  ; To transfer the argument value capFibo into a register just do:
  ; mov rax, [argv(.capFibo)]
  ; To print the number in rax: `INVOKE print_num, rax`
  ; TODO: code for this one.
ENDPROC


; *********************************************************
; Below this line we have some helper functions You do not need to worry about
; any of these functions.
; *********************************************************

; Prints a number
PROC print_num, uint32_t number

; This line will allow you to use any register and not have to worry about
; printf overriding those registers.
USES rax, rbx, rcx, rdx, rsi, rdi, r9, r8
LOCALS NONE

  INVOKE printf, numfmt

ENDPROC

PROC read_num, ptrdiff_t prompt
LOCALS
  LOCAL buff, uint8_t, 80
ENDLOCALS
  
  INVOKE printf, [argv(.prompt)]

  lea rax, [var(.buff)]
  INVOKE fgets, rax, 80, stdin

  lea rax, [var(.buff)]
  INVOKE atoi, rax
ENDPROC

PROC main
LOCALS 
  LOCAL cap, uint32_t
ENDLOCALS
  
  INVOKE read_num, input_cap
  mov [var(.cap)], eax

  INVOKE puts, nullstr
  INVOKE puts, fibs
  INVOKE fibo, [var(.cap)]

ENDPROC