Implement elsif for if-statements

boot/stage12.elna

@@ -109,7 +109,7 @@ end;
 (* Returns the amount of bytes written in a0. *)
 proc _read_file(v88: Word, v84: Word);
 begin
-	_syscall(0, v88, v84, 0, 0, 0, 63);
+	return _syscall(0, v88, v84, 0, 0, 0, 63)
 end;
 
 (* Writes to the standard output. *)
@@ -610,7 +610,7 @@ begin
 		_compile_binary_rhs();
 
 		(* Execute the operation. *)
-		_write_z("\tslt t0, t1, t0\n\0");
+		_write_z("\tslt t0, t0, t1\n\0");
 
 		goto .compile_expression_end;
 	end;
@@ -1929,8 +1929,15 @@ begin
 	_symbol_table_build();
 
 	(* Read the source from the standard input. *)
+	v4 := @source_code;
+
+	.start_read;
 	(* Second argument is buffer size. Modifying update the source_code definition. *)
-	_read_file(@source_code, 81920);
+	v0 := _read_file(v4, 81920);
+	if v0 > 0 then
+		v4 := v4 + v0;
+		goto .start_read;
+	end;
 	_compile();
 
 	_exit(0);