grep - Bugs: bug #36842, grep -P dumps when using large...
You are not allowed to post comments on this tracker with your current authentication level.
bug #36842: grep -P dumps when using large regex, version 2.5.1
Submitter: | Robert Klima <robertklima> | ||
Submitted: | Fri 13 Jul 2012 03:39:03 PM UTC | ||
Category: | None | Severity: | 3 - Normal |
Item Group: | None | Status: | None |
Privacy: | Public | Assigned to: | None |
Open/Closed: | Open |
No files currently attached
Depends on the following items: None found
Items that depend on this one: None found
Carbon-Copy List
There are 0 votes so far. Votes easily highlight which items people would like to see resolved in priority, independently of the priority of the item set by tracker managers.
Follows 1 latest change.
Date | Changed by | Updated Field | Previous Value | => | Replaced by |
---|---|---|---|---|---|
2012-07-13 | robertklima | Carbon-Copy | - | Added -email is unavailable- |
Powered by Savane 3.13-f8d8.
Corresponding source code
This causes grep to dump:
klr@vwglnx02:~> ( echo 'if ( GetProfileStr( "GLOBAL", "HW", ins, iVar->hw,
sizeof( iVar->hw ) - 1,'; echo ' pcx->iniFile )) x=2; /* return
value not used */' ) | grep -P
'(?s)if\s*[(][^()]*([^()]*[(][^()]*([^()]*[(][^()]*([^()]*[(][^()]*([^()]*[(][^()]*([^()]*[(][^()]*([^()]*[(][^()](?#innerpart)*[^()]*[)][^()]*)*[^()]*[)][^()]*)*[^()]*[)][^()]*)*[^()]*[)][^()]*)*[^()]*[)][^()]*)*[^()]*[)][^()]*)*[^()]*[)]\s*((?#a_comment)\s*[/][*]([^*]|[*][^/])*[*][/]\s*)*;'
Aborted (core dumped)
remove these three chars "x=2" and it works:
klr@vwglnx02:~> ( echo 'if ( GetProfileStr( "GLOBAL", "HW", ins, iVar->hw,
sizeof( iVar->hw ) - 1,'; echo ' pcx->iniFile )) ; /* return
value not used */' ) | grep -P
'(?s)if\s*[(][^()]*([^()]*[(][^()]*([^()]*[(][^()]*([^()]*[(][^()]*([^()]*[(][^()]*([^()]*[(][^()]*([^()]*[(][^()](?#innerpart)*[^()]*[)][^()]*)*[^()]*[)][^()]*)*[^()]*[)][^()]*)*[^()]*[)][^()]*)*[^()]*[)][^()]*)*[^()]*[)][^()]*)*[^()]*[)]\s*((?#a_comment)\s*[/][*]([^*]|[*][^/])*[*][/]\s*)*;'
if ( GetProfileStr( "GLOBAL", "HW", ins, iVar->hw, sizeof( iVar->hw ) - 1,
pcx->iniFile )) ; /* return value not used */
klr@vwglnx02:~> grep --version
grep (GNU grep) 2.5.1
Copyright 1988, 1992-1999, 2000, 2001 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
Explanation of the regex:
The regex is a straight forward aproach to check for balanced parantheses in
C-code and then to check whether there is an if-statement or not (empty
if-statement).
It is necessary to code such a complex regex like this as regex normally cannot
be used to deal with balanced parantheses.
It even happens here:
klr@vwglnx02:~> ( echo 'if ( GetProfileStr( "GLOBAL", "HW", ins, iVar->hw,
sizeof( iVar->hw ) - 1,'; echo ' pcx->iniFile )) x=2; /* return
value not used */' ) | grep -P
'(?s)if\s*[(][^()]*([^()]*[(][^()]*([^()]*[(][^()]*(?#innerpart)[^()]*[)][^()]*)*[^()]*[)][^()]*)*[^()]*[)];'
Aborted (core dumped)
Robert Klima, Dev. Manager, UC4 Software Inc.