- compiler works for basic maths expressions and functions

- basic pointers and reading values from pointers works
- writing to pointers not yet implemented (looks painful so a problem
  for tomorrow)
- updated print library. the compiler has this hardcoded in all programs
  for now

resources/dsa/lib/io/print.dsa

@@ -40,7 +40,7 @@ dw display: 0x20000
 dw current: 0x20000
 
 // ------------------------------------------
-// prints the string at addr(arg[0]) to the screen.
+// prints the string at addr(arg[0]) to the screen. (no trailing whitespace unless explicitly provided)
 print:
     push bpr
     mov spr, bpr
@@ -50,13 +50,36 @@ print:
 
 _print_loop:
 	ldb rg0, acc
+	cmp acc, zero
+	jeq _end
 	stb acc, rg1
 
 	addi rg0, 1
 	addi rg1, 1
 
-    cmp acc, zero
-	jne _print_loop
+	jmp _print_loop
+
+// ------------------------------------------
+println:
+    push bpr
+    mov spr, bpr
+
+    ldw bpr, rg0, 8
+    ldw current, rg1
+
+_println_loop:
+	ldb rg0, acc
+	cmp acc, zero
+	jeq _println_end
+	stb acc, rg1
+
+	addi rg0, 1
+	addi rg1, 1
+
+	jmp _println_loop
+
+_println_end:
+    call print_newline
     jmp _end
 
 // ------------------------------------------