asprintf and snprintf support

disk/i386/pc/biosdisk.c

@@ -56,7 +56,8 @@ grub_biosdisk_call_hook (int (*hook) (const char *name), int drive)
 {
   char name[10];
 
-    grub_sprintf (name, (drive & 0x80) ? "hd%d" : "fd%d", drive & (~0x80));
+  grub_snprintf (name, sizeof (name),
+		 (drive & 0x80) ? "hd%d" : "fd%d", drive & (~0x80));
   return hook (name);
 }