===================================================================
RCS file: /cvsrepo/anoncvs/cvs/src/usr.bin/awk/b.c,v
retrieving revision 1.21
retrieving revision 1.22
diff -c -r1.21 -r1.22
*** src/usr.bin/awk/b.c	2020/06/10 21:00:01	1.21
--- src/usr.bin/awk/b.c	2020/06/10 21:01:32	1.22
***************
*** 1,4 ****
! /*	$OpenBSD: b.c,v 1.21 2020/06/10 21:00:01 millert Exp $	*/
  /****************************************************************
  Copyright (C) Lucent Technologies 1997
  All Rights Reserved
--- 1,4 ----
! /*	$OpenBSD: b.c,v 1.22 2020/06/10 21:01:32 millert Exp $	*/
  /****************************************************************
  Copyright (C) Lucent Technologies 1997
  All Rights Reserved
***************
*** 831,837 ****
  				if (cc->cc_name != NULL && prestr[1 + cc->cc_namelen] == ':' &&
  				    prestr[2 + cc->cc_namelen] == ']') {
  					prestr += cc->cc_namelen + 3;
! 					for (i = 0; i < NCHARS; i++) {
  						if (!adjbuf((char **) &buf, &bufsz, bp-buf+1, 100, (char **) &bp, "relex2"))
  						    FATAL("out of space for reg expr %.10s...", lastre);
  						if (cc->cc_func(i)) {
--- 831,845 ----
  				if (cc->cc_name != NULL && prestr[1 + cc->cc_namelen] == ':' &&
  				    prestr[2 + cc->cc_namelen] == ']') {
  					prestr += cc->cc_namelen + 3;
! 					/*
! 					 * BUG: We begin at 1, instead of 0, since we
! 					 * would otherwise prematurely terminate the
! 					 * string for classes like [[:cntrl:]]. This
! 					 * means that we can't match the NUL character,
! 					 * not without first adapting the entire
! 					 * program to track each string's length.
! 					 */
! 					for (i = 1; i < NCHARS; i++) {
  						if (!adjbuf((char **) &buf, &bufsz, bp-buf+1, 100, (char **) &bp, "relex2"))
  						    FATAL("out of space for reg expr %.10s...", lastre);
  						if (cc->cc_func(i)) {