added some string escape chars and include path

cl-forth.lisp

@@ -20,9 +20,13 @@
     (iter (for ch = (read-char stream))
           (cond ((char= ch #\")
                  (finish))
-                ((and (char= ch #\\) (char= (peek-char nil stream) #\n))
-                 (read-char stream)
-                 (write-char #\Newline str))
+                ((char= ch #\\)
+                 (case (peek-char nil stream)
+                   (#\n (write-char #\Newline str))
+                   (#\0 (write-char (code-char 0) str))
+                   (#\\ (write-char #\\ str))
+                   (#\" (write-char #\" str)))
+                 (read-char stream))
                 (t (write-char ch str))))))
 
 (defun read-character (stream line-num line col)
@@ -214,11 +218,17 @@
               ((eq :son (car tok)) (reverse makrodef))
             (push tok makrodef)))))
 
+(defun find-library (name)
+  (or (probe-file (merge-pathnames name sb-ext:*core-pathname*))
+      (probe-file (merge-pathnames name (from-root "test/")))
+      (probe-file (merge-pathnames name (from-root "lib/")))
+      (error "library ~a could not be found." name)))
+
 (defmethod parse-op ((parser parser) token (id (eql :kütüphane)))
   "Library and the executable must be in the same location, no other search is made currently."
   (let ((file (car (read-token parser))))
     (setf (tokens parser)
-          (append (lex-file (merge-pathnames file sb-ext:*core-pathname*))
+          (append (lex-file (find-library file))
                   (tokens parser)))))
 
 (defun parse-tokens (tokens)