Make fread call error handle

src/main.cc

@@ -15,7 +15,14 @@ int main(int argc, char *argv[]) {
       fseek(file, 0, SEEK_SET);
 
       char *script_content = (char *)malloc(size + 1);
-      fread(script_content, 1, size, file);
+      size_t read = fread(script_content, 1, size, file);
+
+      if (read != size) {
+        fprintf(stderr, "Failed to read startup script: %s\n", startup_script);
+        free(script_content);
+        fclose(file);
+        return 1;
+      }
       script_content[size] = '\0';
 
       fclose(file);