From 48f371d380e07ba29b1ed7fce09ae4906eef4e78 Mon Sep 17 00:00:00 2001
From: Virgil Dupras <hsoft@hardcoded.net>
Date: Mon, 8 Jun 2020 06:47:06 -0400
Subject: [PATCH] emul: add sanity check for blkfs

---
 emul/emul.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/emul/emul.c b/emul/emul.c
index 4c82643..6075125 100644
--- a/emul/emul.c
+++ b/emul/emul.c
@@ -86,6 +86,13 @@ Machine* emul_init()
         fprintf(stderr, "Can't open\n");
         return NULL;
     }
+    fseek(blkfp, 0, SEEK_END);
+    if (ftell(blkfp) < 100 * 1024) {
+        fclose(blkfp);
+        fprintf(stderr, "emul/blkfs too small, something's wrong, aborting.\n");
+        return NULL;
+    }
+    fseek(blkfp, 0, SEEK_SET);
     // initialize memory
     memset(m.mem, 0, 0x10000);
     FILE *bfp = fopen(FBIN_PATH, "r");