Update 'a1/program.c'

a1/program.c

@@ -14,7 +14,10 @@ int main() {
     char code[MAX_SIZE];
     stack.size = 0;
 
-    fgets(code, sizeof(code), stdin);
+    if (fgets(code, sizeof(code), stdin) == NULL) {
+        printf("Error reading input.\n");
+        return 1;
+    }
 
     if (code[strlen(code) - 1] == '\n') {
         code[strlen(code) - 1] = '\0';
@@ -25,6 +28,10 @@ int main() {
     char missing_closing[MAX_SIZE];
     int missing_count = 0;
 
+    if (strlen(code) > MAX_SIZE) {
+        return 1;
+    }
+
     for (int i = 0; code[i] != '\0'; i++) {
         if (code[i] == '(' || code[i] == '[' || code[i] == '{' || code[i] == '<') {
             if (stack.size < MAX_SIZE) {
@@ -47,7 +54,7 @@ int main() {
                 (code[i] == '>' && opening != '<')) {
                 printf("Crossed bracket %c in %d, expected %c\n", code[i], i, opening);
                 return 0;
-                }
+            }
         }
     }
 
@@ -67,4 +74,4 @@ int main() {
     }
 
     return 0;
-}
+}