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Re: Infinite loop in bash glob matching


From: Chet Ramey
Subject: Re: Infinite loop in bash glob matching
Date: Wed, 17 May 2017 11:48:47 -0400
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.12; rv:52.0) Gecko/20100101 Thunderbird/52.1.1

On 5/17/17 10:52 AM, Eduardo Bustamante wrote:

> Then in "9.3.5 RE Bracket Expression"
> (http://pubs.opengroup.org/onlinepubs/9699919799.2008edition/basedefs/V1_chap09.html#tag_09_03_05),
> 
>     The character sequences "[." , "[=" , and "[:" ( <left-square-bracket>
>     followed by a <period>, <equals-sign>, or <colon>) shall be special inside
>     a bracket expression and are used to delimit collating symbols, 
> equivalence
>     class expressions, and character class expressions. These symbols shall be
>     followed by a valid expression and the matching terminating sequence ".]" 
> ,
>     "=]" , or ":]" , as described in the following items.

I read this as saying that it's a requirement on the application to ensure
that character classes are correctly formed, and it's unspecified behavior
if they're not.

So you're right: people should not count on shells treating improperly-
formed character classes as literal characters.

-- 
``The lyf so short, the craft so long to lerne.'' - Chaucer
                 ``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRU    address@hidden    http://cnswww.cns.cwru.edu/~chet/



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