From owner-freebsd-current  Wed Jul 17 00:56:58 1996
Return-Path: owner-current
Received: (from root@localhost)
          by freefall.freebsd.org (8.7.5/8.7.3) id AAA07150
          for current-outgoing; Wed, 17 Jul 1996 00:56:58 -0700 (PDT)
Received: from godzilla.zeta.org.au (godzilla.zeta.org.au [203.2.228.19])
          by freefall.freebsd.org (8.7.5/8.7.3) with SMTP id AAA07145
          for <current@FreeBSD.org>; Wed, 17 Jul 1996 00:56:54 -0700 (PDT)
Received: (from bde@localhost) by godzilla.zeta.org.au (8.6.12/8.6.9) id RAA00019; Wed, 17 Jul 1996 17:54:01 +1000
Date: Wed, 17 Jul 1996 17:54:01 +1000
From: Bruce Evans <bde@zeta.org.au>
Message-Id: <199607170754.RAA00019@godzilla.zeta.org.au>
To: bde@zeta.org.au, davidg@root.com
Subject: Re: sed broken
Cc: bostic@bsdi.com, current@FreeBSD.org, mark@linus.demon.co.uk
Sender: owner-current@FreeBSD.org
X-Loop: FreeBSD.org
Precedence: bulk

>>Making init_sysent.c in /sys/kern no longer works.  sed looped and grew to
>>50MB before I killed it.  I backed out to rounds of attempted fixes to
>>sed/compile.c (to rev.1.4) and the make worked again.

>   Try Keith Bostic's final version (you'll have to dig it out of PR#1350) and
>see if it works.

Our PR's seem to be tangled up: some followups to #1350 are in #1353, #1354
and #1356 with Keith's final version in #1356.

I fixed it independently before locating all the PR's.  My version is
the same as Keith's except it loses more gracefully for lines not
terminated by a newline.

Bruce

Index: compile.c
===================================================================
RCS file: /a/ncvs/src/usr.bin/sed/compile.c,v
retrieving revision 1.4
diff -c -2 -r1.4 compile.c
*** compile.c	1995/08/16 05:56:42	1.4
--- compile.c	1996/07/17 07:08:56
***************
*** 616,620 ****
  compile_text()
  {
! 	int asize, size;
  	char *text, *p, *op, *s;
  	char lbuf[_POSIX2_LINE_MAX + 1];
--- 616,620 ----
  compile_text()
  {
! 	int asize, esc_nl, size;
  	char *text, *p, *op, *s;
  	char lbuf[_POSIX2_LINE_MAX + 1];
***************
*** 627,637 ****
  		p = lbuf;
  		EATSPACE();
! 		for (; *p; p++) {
! 			if (*p == '\\')
! 				p++;
  			*s++ = *p;
  		}
  		size += s - op;
! 		if (p[-2] != '\\') {
  			*s = '\0';
  			break;
--- 627,637 ----
  		p = lbuf;
  		EATSPACE();
! 		for (esc_nl = 0; *p != '\0'; p++) {
! 			if (*p == '\\' && p[1] != '\0' && *++p == '\n')
! 				esc_nl = 1;
  			*s++ = *p;
  		}
  		size += s - op;
! 		if (!esc_nl) {
  			*s = '\0';
  			break;