;
; echo a string on the command line
;

section .data
	space:   db ' '
	newline: db 10

section .text

global _start

_start:

	; initialize registers
	xor	eax, eax
	xor	ebx, ebx
	xor	ecx, ecx
	xor	edx, edx
	
	; get argc (exclude argv[0])
	pop	edi
	dec	edi
	pop	esi
	
loop_argv:
	; enough arguments?
	cmp	edi, 0
	jle	term
	
	; get argv[i]
	pop	esi
	xor	ebx, ebx

loop_len:
	; find the length
	
	mov	al, byte [esi]
	cmp	al, 0
	je	cont_argv

	inc	ebx
	inc	esi
	jmp	loop_len
	
cont_argv:
	; point to the beginning of the string
	sub	esi, ebx

	; print argv[i]
	mov	edx, ebx
	mov	ecx, esi
	mov	ebx, 1
	mov	eax, 4
	int	0x80

	; print a space
	mov	edx, 1
	mov	ecx, space
	mov	eax, 4
	int	0x80

	dec	edi
	jmp	loop_argv

term:
	; print a newline
	mov	edx, 1
	mov	ecx, newline
	mov	ebx, 1
	mov	eax, 4
	int	0x80

	; exit(0)
	mov	ebx, 0
	mov	eax, 1
	int	0x80