Split line into words

postfix.s

@@ -21,6 +21,42 @@ readloop:
 	cmp $0x0a, %rax
 	jne readloop
 
+	## Start reading words at start of buffer with zero length
+	mov $buf, %rsi
+	mov $0, %rdx
+wordloop:
+	## Copy character into R8
+	movzx (%rsi, %rdx), %r8
+
+	## Print the word if the character is a space or a newline
+	cmp $0x20, %r8
+	je doword
+	cmp $0x0a, %r8
+	je doword
+
+	## Increment word length and loop
+	inc %rdx
+	jmp wordloop
+
+doword:
+	## Go back to start if the terminating character (which is in R8)
+	## of the word was a line feed
+	cmp $0x0a, %r8
+	je _start
+
+	## Add the word length to RSI and increment until non-space is
+	## found
+	add %rdx, %rsi
+spaceloop:
+	inc %rsi
+	mov (%rsi), %rax
+	cmp $0x20, %rax
+	je spaceloop
+
+	## Zero the word length then return to the word loop.
+	mov $0, %rdx
+	jmp wordloop
+
 exit:
 	## Exit with code 0
 	mov $60, %rax