Use an input file

cyoa.leg

@@ -5,6 +5,13 @@
 #include <cstdlib>
 #include <cassert>
 
+FILE* yyin = stdin;
+
+#define YY_INPUT(buf, result, max_size) { \
+    int yyc = getc(yyin); \
+    result = (EOF == yyc) ? 0 : (*(buf) = yyc, 1); \
+  }
+
 #define STATCHECK_GT 1
 #define STATCHECK_LT 2
 
@@ -217,14 +224,21 @@ void print_page(Page *page) {
   }
 }
 
-int main() {
-  if (!yyparse()) {
-    printf("Parsing Error!\n");
+std::vector<Page*> CyoaParse(FILE *file) {
+  yyin = file;
+  yyparse();
+  yyin = stdin;
+  return pages;
+}
+  
+int main(int argc, char **argv) {
+  if (argc < 2) {
     return 1;
-  } else {
-    for (Page* page : pages) {
-      print_page(page);
-    }
+  }
+  FILE* fin = fopen(argv[1], "r");
+  auto mypages = CyoaParse(fin);
+  for (Page* page : pages) {
+    print_page(page);
   }
   return 0;
 }