3 files changed, 7 insertions, 1 deletions
diff --git a/src/sys/include/np/lex.h b/src/sys/include/np/lex.h
index 0edf262..ebd6f32 100644
--- a/src/sys/include/np/lex.h
+++ b/src/sys/include/np/lex.h
@@ -32,6 +32,9 @@
 
 #include <sys/types.h>
 
+/* End-of-file */
+#define LEX_EOF (-2)
+
 struct np_work;
 
 /* Keywords */
diff --git a/src/sys/np/core/np_lex.c b/src/sys/np/core/np_lex.c
index b2fad3a..7d72db8 100644
--- a/src/sys/np/core/np_lex.c
+++ b/src/sys/np/core/np_lex.c
@@ -323,7 +323,7 @@ lex_nom(struct np_work *work, struct lex_token *res)
     /* Match the token type */
     switch (c) {
     case '\0':
-        return -2;  /* EOF */
+        return LEX_EOF;
     case '(':
         res->token = TT_LPAREN;
         break;
diff --git a/src/sys/np/core/np_parse.c b/src/sys/np/core/np_parse.c
index aba7198..4973ac0 100644
--- a/src/sys/np/core/np_parse.c
+++ b/src/sys/np/core/np_parse.c
@@ -272,6 +272,9 @@ parse_work(struct np_work *work)
 
     while (error == 0) {
         error = lex_nom(work, &tok);
+        if (error == LEX_EOF) {
+            break;
+        }
         if (error < 0) {
             return error;
         }