Path: utzoo!attcan!uunet!peregrine!ccicpg!felix!zemon
From: ado@elsie.UUCP (Arthur David Olson)
Newsgroups: comp.unix.ultrix
Subject: Re: /etc/init -> /bin/init
Message-ID: <35756@felix.UUCP>
Date: 16 May 88 19:11:42 GMT
References: <33321@felix.UUCP>
Sender: zemon@felix.UUCP
Reply-To: ado@elsie.UUCP (Arthur David Olson)
Organization: NIH-LEC, Bethesda, MD
Lines: 78
Approved: zemon@felix.UUCP
Reply-Path:


In article <33321@felix.UUCP>, nes@prcrs.UUCP (Nancy Shoemaker) writes:
> . . .
> Section 2.5.18 reports that there are limits to the length of the
> regular expression that can be handled by ed, ex and the grep type
> commands.  [Surprise?]  The SPR reported that the limit will sometimes
> be exceeded by the command /usr/bin/calendar.  When the month ends on
> a Saturday or Sunday, the regular expression generated on the last
> Friday will be longer than egrep can handle and calendar will abort.
> Don't expect Ultrix v{1.1,1.2,2.0,2.2} "calendar" to remind you of
> anything important on Friday, April 29, 1988!

Don't know if this will work around your April bug; in any event. . .

!From ado Sun Nov 30 19:16:40 1986
!...
!Subject: MORE/bsd 4.3 /usr/lib/calendar foils egrep on Fridays late in the year
!...
!
!Index:	usr.bin/calendar/calendar.c MORE/bsd 4.3 Fix
!
!Description:
!	The "egrep" scripts generated by "/usr/lib/calendar" are rejected
!	by "egrep" on Fridays late in the year.
!
!Repeat-By:
!	Run the commands
!		date 8611281200
!		/usr/lib/calendar > /tmp/try
!		egrep -f /tmp/try < /dev/null
!	and note the result:
!		egrep: regular expression too long
!
!Fix:
!	Here are context differences between the version of "calendar.c"
!	distributed with MORE/bsd 4.3 and a version that produces a
!	different regular expression that egrep can handle.  The different
!	regular expression does not accept "011" as a synonym for "November"
!	but does still accept "01" (. . ."09") as a synonym for "January"
!	(. . ."September").
!
!*** old/calendar.c	Sun Nov 30 19:08:44 1986
!--- new/calendar.c	Sat Nov 29 10:42:20 1986
!***************
!*** 1,3 ****
!--- 1,8 ----
!+ #ifndef ASWAS
!+ #ifdef OBJECTID
!+ static char	elsieid[] = "@(#)calendar.c	3.2";
!+ #endif /* OBJECTID */
!+ #endif /* !ASWAS */
!  static	char *sccsid = "@(#)calendar.c	4.5 (Berkeley) 84/05/07";
!  /* /usr/lib/calendar produces an egrep -f file
!     that will select today's and tomorrow's
!***************
!*** 30,35 ****
!--- 35,51 ----
!  {
!  	struct tm *tm;
!  	tm = localtime(&t);
!+ #ifndef ASWAS
!+ 	/*
!+ 	** Prevent "egrep: regular expression too long" error.
!+ 	*/
!+ 	if ((tm->tm_mon + 1) >= 10)
!+ 		(void) printf(
!+ "(^|[ 	(,;])((%s[^ \t]*[ \t]*|%d/)0*%d)([^0123456789]|$)\n",
!+ 		month[tm->tm_mon],
!+ 		tm->tm_mon + 1, tm->tm_mday);
!+ 	else
!+ #endif /* !ASWAS */
!  	printf("(^|[ 	(,;])((%s[^ \t]*[ \t]*|(0%d|%d)/)0*%d)([^0123456789]|$)\n",
!  		month[tm->tm_mon],
!  		tm->tm_mon + 1, tm->tm_mon + 1, tm->tm_mday);


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