===================================================================
RCS file: /cvsrepo/anoncvs/cvs/src/usr.bin/tmux/format.c,v
retrieving revision 1.66
retrieving revision 1.67
diff -c -r1.66 -r1.67
*** src/usr.bin/tmux/format.c	2015/05/12 15:29:29	1.66
--- src/usr.bin/tmux/format.c	2015/05/20 06:39:02	1.67
***************
*** 1,4 ****
! /* $OpenBSD: format.c,v 1.66 2015/05/12 15:29:29 nicm Exp $ */
  
  /*
   * Copyright (c) 2011 Nicholas Marriott <nicm@users.sourceforge.net>
--- 1,4 ----
! /* $OpenBSD: format.c,v 1.67 2015/05/20 06:39:02 nicm Exp $ */
  
  /*
   * Copyright (c) 2011 Nicholas Marriott <nicm@users.sourceforge.net>
***************
*** 335,341 ****
  	size_t		 tmplen;
  	struct tm	*tm;
  
! 	if (fmt == NULL)
  		return (xstrdup(""));
  
  	tm = localtime(&t);
--- 335,341 ----
  	size_t		 tmplen;
  	struct tm	*tm;
  
! 	if (fmt == NULL || *fmt == '\0')
  		return (xstrdup(""));
  
  	tm = localtime(&t);