X-Git-Url: http://git.mutantstargoat.com/user/nuclear/?a=blobdiff_plain;f=src%2Ffreeglut_callbacks.c;h=da06283cd91cc101d519677ce2a4eaaf8c9024e1;hb=cbca8ac9cefa125bd877871b9236845d1262263e;hp=ef404f746a627f777487b6fc65bf319c27b98004;hpb=fe89df7de1aa6a732a441e983cce03e1fd6fd81a;p=freeglut

diff --git a/src/freeglut_callbacks.c b/src/freeglut_callbacks.c
index ef404f7..da06283 100644
--- a/src/freeglut_callbacks.c
+++ b/src/freeglut_callbacks.c
@@ -48,6 +48,9 @@
  */
 void FGAPIENTRY glutDisplayFunc( void (* callback)( void ) )
 {
+    if( !callback )
+	fgError ("Fatal error in program.  NULL display callback not "
+	    "permitted in GLUT 3.0+ or freeglut 2.0.1+\n");
     SET_CALLBACK( Display );
 
     /*
@@ -106,7 +109,7 @@ void FGAPIENTRY glutTimerFunc( unsigned int timeOut, void (* callback)( int ), i
     /*
      * Create a new freeglut timer hook structure
      */
-    timer = calloc( sizeof(SFG_Timer), 1 );
+    timer = (SFG_Timer *)calloc( sizeof(SFG_Timer), 1 );
 
     /*
      * Remember the callback address and timer hook's ID