Date: Sat, 12 Jul 2003 12:31:49 +0200 (CEST) From: Jens Schweikhardt <schweikh@schweikhardt.net> To: FreeBSD-gnats-submit@FreeBSD.org Subject: standards/54410: one-true-awk not POSIX compliant (no extended REs) Message-ID: <200307121031.h6CAVnIi093652@hal9000.schweikhardt.net> Resent-Message-ID: <200307121040.h6CAe9kr085263@freefall.freebsd.org>
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>Number: 54410
>Category: standards
>Synopsis: one-true-awk not POSIX compliant (no extended REs)
>Confidential: no
>Severity: serious
>Priority: high
>Responsible: freebsd-standards
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Sat Jul 12 03:40:09 PDT 2003
>Closed-Date:
>Last-Modified:
>Originator: Jens Schweikhardt
>Release: FreeBSD 5.1-CURRENT i386
>Organization:
Digital Details
>Environment:
System: FreeBSD hal9000.schweikhardt.net 5.1-CURRENT FreeBSD 5.1-CURRENT #0: Wed Jul 9 21:22:46 CEST 2003 toor@hal9000.schweikhardt.net:/usr/obj/share/src/HEAD/sys/HAL9000 i386
any
>Description:
Our /usr/bin/awk understands only basic RE, not Extended RE, as
required by IEEE Std 1003.1-2001:
References:
<quote std="IEEE Std 1003.1-2001" section=awk>
...
Regular Expressions
The awk utility shall make use of the extended regular expression
notation (see the Base Definitions volume of IEEE Std 1003.1-2001,
Section 9.4, Extended Regular Expressions)
</quote>
<quote std="IEEE Std 1003.1-2001" section=ere>
EREs Matching Multiple Characters
...
5. When an ERE matching a single character or an ERE enclosed in
parentheses is followed by an interval expression of the format "{m}" ,
"{m,}" , or "{m,n}" , together with that interval expression it shall
match what repeated consecutive occurrences of the ERE would match. The
values of m and n are decimal integers in the range 0 <= m<= n<=
{RE_DUP_MAX}, where m specifies the exact or minimum number of
occurrences and n specifies the maximum number of occurrences. The
expression "{m}" matches exactly m occurrences of the preceding ERE,
"{m,}" matches at least m occurrences, and "{m,n}" matches any number of
occurrences between m and n, inclusive.
</quote>
>How-To-Repeat:
echo e | /usr/bin/awk '/e{1}/' # should print e, but prints nothing
>Fix:
It's probaly POLA violation to change the default RE style from
BRE to ERE, but we should add a POSIX mode that uses BRE (e.g.
gawk needs --posix to be compliant).
>Release-Note:
>Audit-Trail:
>Unformatted:
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