From 6e7996f1a84793a3d88e141a340b74fdae8dbf73 Mon Sep 17 00:00:00 2001
From: nick black <dankamongmen@gmail.com>
Date: Sun, 7 Jun 2020 16:11:21 -0400
Subject: [PATCH] notcurses_init: properly check flags for unknowns

---
 src/lib/notcurses.c | 2 +-
 src/poc/blitters.c  | 3 +++
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/lib/notcurses.c b/src/lib/notcurses.c
index 3b8fb247c..3c13db3f2 100644
--- a/src/lib/notcurses.c
+++ b/src/lib/notcurses.c
@@ -735,7 +735,7 @@ notcurses* notcurses_init(const notcurses_options* opts, FILE* outfp){
     fprintf(stderr, "Provided an illegal negative margin, refusing to start\n");
     return NULL;
   }
-  if(opts->flags > NCOPTION_NO_ALTERNATE_SCREEN){
+  if(opts->flags > (NCOPTION_NO_ALTERNATE_SCREEN << 1u)){
     fprintf(stderr, "Provided an illegal Notcurses option, refusing to start\n");
     return NULL;
   }
diff --git a/src/poc/blitters.c b/src/poc/blitters.c
index ba7489ec4..6b2b07fc6 100644
--- a/src/poc/blitters.c
+++ b/src/poc/blitters.c
@@ -16,6 +16,9 @@ int main(int argc, char** argv){
     .flags = NCOPTION_INHIBIT_SETLOCALE | NCOPTION_NO_ALTERNATE_SCREEN,
   };
   struct notcurses* nc = notcurses_init(&nopts, NULL);
+  if(nc == NULL){
+    return EXIT_FAILURE;
+  }
   struct ncplane* std = notcurses_stdplane(nc);
   // FIXME not all work yet; this subset does
   const int blitters[] = {