1 files changed, 9 insertions, 2 deletions
diff --git a/main.c b/main.c
index 7ffdccd..0b7ecd9 100644
--- a/main.c
+++ b/main.c
@@ -7,6 +7,7 @@ extern ht_t *WORD_TABLE;
 extern array_t *STACK;
 extern char *INBUF;
 extern parser_t *PARSER;
+extern array_t *EVAL_STACK;
 
 void usage() {
   printf("Usage: stem [-hv] [file]\n");
@@ -15,7 +16,7 @@ void usage() {
 
 void version() {
   printf("Author: Preston Pan, MIT License 2023\n");
-  printf("stem, version 1.0\n");
+  printf("stem, version 1.1\n");
   exit(0);
 }
 
@@ -34,6 +35,11 @@ int main(int argc, char **argv) {
   }
 
   FILE *FP = fopen(argv[1], "rb");
+
+  if (!FP) {
+    usage();
+  }
+
   ssize_t bytes_read = getdelim(&INBUF, &len, '\0', FP);
   if (FP != NULL) {
     fflush(FP);
@@ -43,7 +49,7 @@ int main(int argc, char **argv) {
   PARSER = init_parser(INBUF);
   STACK = init_array(10);
   WORD_TABLE = init_ht(500);
-
+  EVAL_STACK = init_array(10);
   while (1) {
     v = parser_get_next(PARSER);
     if (v == NULL)
@@ -56,5 +62,6 @@ int main(int argc, char **argv) {
   array_free(STACK);
   free(PARSER);
   free(INBUF);
+  array_free(EVAL_STACK);
   return 0;
 }