===================================================================
RCS file: /cvsrepo/anoncvs/cvs/src/usr.bin/awk/awk.h,v
retrieving revision 1.9
retrieving revision 1.10
diff -c -r1.9 -r1.10
*** src/usr.bin/awk/awk.h	2001/09/08 00:12:40	1.9
--- src/usr.bin/awk/awk.h	2002/12/19 21:24:28	1.10
***************
*** 1,4 ****
! /*	$OpenBSD: awk.h,v 1.9 2001/09/08 00:12:40 millert Exp $	*/
  /****************************************************************
  Copyright (C) Lucent Technologies 1997
  All Rights Reserved
--- 1,4 ----
! /*	$OpenBSD: awk.h,v 1.10 2002/12/19 21:24:28 millert Exp $	*/
  /****************************************************************
  Copyright (C) Lucent Technologies 1997
  All Rights Reserved
***************
*** 31,36 ****
--- 31,38 ----
  
  #define	xfree(a)	{ if ((a) != NULL) { free((char *) a); a = NULL; } }
  
+ #define	NN(p)	((p) ? (p) : "(null)")	/* guaranteed non-null for dprintf 
+ */
  #define	DEBUG
  #ifdef	DEBUG
  			/* uses have to be doubly parenthesized */