===================================================================
RCS file: /cvsrepo/anoncvs/cvs/src/usr.bin/cvs/rcsnum.c,v
retrieving revision 1.16
retrieving revision 1.17
diff -c -r1.16 -r1.17
*** src/usr.bin/cvs/rcsnum.c	2005/09/19 15:45:16	1.16
--- src/usr.bin/cvs/rcsnum.c	2005/10/10 13:06:24	1.17
***************
*** 1,4 ****
! /*	$OpenBSD: rcsnum.c,v 1.16 2005/09/19 15:45:16 niallo Exp $	*/
  /*
   * Copyright (c) 2004 Jean-Francois Brousseau <jfb@openbsd.org>
   * All rights reserved.
--- 1,4 ----
! /*	$OpenBSD: rcsnum.c,v 1.17 2005/10/10 13:06:24 joris Exp $	*/
  /*
   * Copyright (c) 2004 Jean-Francois Brousseau <jfb@openbsd.org>
   * All rights reserved.
***************
*** 323,328 ****
--- 323,343 ----
  	if (num->rn_id[num->rn_len - 1] == RCSNUM_MAXNUM)
  		return (NULL);
  	num->rn_id[num->rn_len - 1]++;
+ 	return (num);
+ }
+ 
+ /*
+  * rcsnum_dec()
+  *
+  * Decreases the revision number specified in <num>
+  * Returns pointer to the <num> on success, or NULL on failure.
+  */
+ RCSNUM *
+ rcsnum_dec(RCSNUM *num)
+ {
+ 	if (num->rn_id[num->rn_len - 1] <= 0)
+ 		return (NULL);
+ 	num->rn_id[num->rn_len - 1]--;
  	return (num);
  }