From a66df19edcf3552281a0790df5181113d540e1a6 Mon Sep 17 00:00:00 2001
From: Josh Holtrop <jholtrop@gmail.com>
Date: Tue, 20 Oct 2020 00:09:09 -0400
Subject: [PATCH] add fb_ready()

---
 src/fb.c       | 6 ++++++
 src/fb.h       | 2 ++
 src/hos_main.c | 4 ++++
 3 files changed, 12 insertions(+)

diff --git a/src/fb.c b/src/fb.c
index 374c28d..80dc0d2 100644
--- a/src/fb.c
+++ b/src/fb.c
@@ -1,4 +1,5 @@
 #include "fb.h"
+#include <stddef.h>
 
 static uint32_t * fb;
 static uint32_t fb_width;
@@ -28,3 +29,8 @@ void fb_init(uint32_t * addr, uint32_t width, uint32_t height, uint32_t pitch)
         }
     }
 }
+
+bool fb_ready(void)
+{
+    return fb != NULL;
+}
diff --git a/src/fb.h b/src/fb.h
index 40882cb..e00f716 100644
--- a/src/fb.h
+++ b/src/fb.h
@@ -2,7 +2,9 @@
 #define FB_H
 
 #include <stdint.h>
+#include <stdbool.h>
 
 void fb_init(uint32_t * addr, uint32_t width, uint32_t height, uint32_t pitch);
+bool fb_ready(void);
 
 #endif
diff --git a/src/hos_main.c b/src/hos_main.c
index 42f9538..b35b115 100644
--- a/src/hos_main.c
+++ b/src/hos_main.c
@@ -5,4 +5,8 @@
 void hos_main(uint32_t mbinfo_addr)
 {
     mbinfo_init(mbinfo_addr);
+    if (!fb_ready())
+    {
+        return;
+    }
 }