1 files changed, 19 insertions, 4 deletions
diff --git a/src/worker.c b/src/worker.c
index c73eb7e..17c7f5e 100644
--- a/src/worker.c
+++ b/src/worker.c
@@ -362,11 +362,26 @@ static char *expand_system_variables( const char *s )
 		fprintf( stderr, "ERROR: out of memory while substituting variables in '%s'\n", s );
 		state = ERROR;
 	}
-	
-	if( state == ERROR ) {
-		return NULL;
+
+	switch( state ) {
+		case COPYING:
+			// fine
+			break;
+		
+		case DOLLAR:
+		case OPEN_BRACE:
+		case VARIABLE:
+			fprintf( stderr, "ERROR: unterminated variable reference in '%s'\n", s );
+			break;
+		
+		case CLOSE_BRACE:
+			fprintf( stderr, "ERROR: illegal state while parsing command '%s'\n", s );
+			break;
+
+		case ERROR:
+			return NULL;
 	}
-	
+		
 	return r;
 }