asmStuff.asm

; MACRO: linux print implementation
%macro MC_linuxPrintImpl 3
	mov ebx, %1  		; | <- print target (1=stdout)
	mov eax, 4	  		; Print 100 bytes starting from str
	mov ecx, %2			; | <- source buffer
	mov edx, %3			; | <- number of characters to print
	int 80h				; \___
%endmacro

; MACRO: read from terminal
%macro MC_linuxTermRead 2
	mov eax, 3			; Read user input into str 
	mov ebx, 0 			; | <- read source (0=stdin) 
	mov ecx, %1			; | <- destination buffer 
	mov edx, %2			; | <- max buffer length
	int 80h				; \___
%endmacro

; MACRO: get read string's length and put it in eax
%macro MC_linuxGetReadStrLen 1
	mov %1, eax
%endmacro

; MACRO: read from terminal and get string length
%macro MC_linuxTermReadWithLen 3
	MC_linuxTermRead %1, %2
	MC_linuxGetReadStrLen %3
%endmacro

; MACRO: print to terminal
%macro MC_linuxTermPrint 2
	MC_linuxPrintImpl 1, %1, %2	
%endmacro

; MACRO: print to file
%macro MC_linuxFileWrite 2
 	MC_linuxPrintImpl eax, %1, %2	
%endmacro

; MACRO: exit program
%macro MC_exitProgram 1
	mov eax, 1   		; Return
	mov ebx, %1      	; | <- return code
	int 80h         	; \___
%endmacro

; MACRO: create a file
%macro MC_linuxFileCreate 2
	mov eax, 8			; Create file
	mov ebx, %1			; | <- file path	
	mov ecx, %2			; | <- permissions
	int 80h 			; \___
%endmacro

; MACRO: open a file
%macro MC_linuxFileOpen 3
	mov eax, 5			; Open file
	mov ebx, %1			; | <- file path
	mov ecx, %2 		; | <- method (0=RDONLY, 1=WRONLY, 2=RDWR, ...)
	mov edx, %3			; | <- permissions
	int 80h 			; \___
%endmacro

; MACRO: close last opened file
%macro MC_linuxFileClose 0
	mov eax, 6			; Close file
	int 80h 			; \___
%endmacro



global _start 

; SECTION: initialized data
section .data							
	strBuffer: times 100 db 0 			; strBuffer is a buffer of 100 '0' bytes
	lineFeed: db 10 					; lineFeed is the character `\n` (newline)
	filePath: db "./testOutput.txt", 0	; filePath 

; SECTION: uninitialized data
section .bss					
	strLen resd 1 						; Will contain the entered string length
	tmpVar resd 1 						; Temp variable

; SECTION: code
section .text
	_start:
		MC_linuxTermReadWithLen strBuffer, 100, [strLen]
		MC_linuxTermPrint strBuffer, [strLen]

		MC_linuxFileCreate filePath, 0777o
		MC_linuxFileOpen filePath, 2, 0777o
	 	MC_linuxFileWrite strBuffer, [strLen]
		MC_linuxFileClose

		MC_exitProgram 0