public inbox for gcc-bugs@sourceware.org
help / color / mirror / Atom feed
* [Bug libstdc++/31401] New: string find behaves strange when searching from npos
@ 2007-03-30 14:53 Ko dot vanderSloot at uvt dot nl
2007-03-30 16:26 ` [Bug libstdc++/31401] " pcarlini at suse dot de
` (7 more replies)
0 siblings, 8 replies; 9+ messages in thread
From: Ko dot vanderSloot at uvt dot nl @ 2007-03-30 14:53 UTC (permalink / raw)
To: gcc-bugs
the following program demonstrates, what I think, a flaw in std::string find.
According to me and (see comp.lang.c++ and c.l.c++.moderated) many others,
find( "astring", string::npos ) should always return string::npos.
But G++ seems to wrap around an start searching at the begin of the string.
sample program:
#include <iostream>
#include <string>
using namespace std;
int main(){
string use = "anu";
string::size_type pos1 = use.find_first_not_of( "an" );
cerr << "pos1=" << pos1 << endl;
pos1 = use.find( "a", string::npos );
if ( pos1 == string::npos )
cerr << "I expected this" << endl;
else
cerr << "problem because pos1=" << pos1 << endl;
pos1 = use.find( "q", string::npos );
if ( pos1 == string::npos )
cerr << "I expected this" << endl;
else
cerr << "problem because pos1=" << pos1 << endl;
}
--
Summary: string find behaves strange when searching from npos
Product: gcc
Version: 4.1.2
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libstdc++
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: Ko dot vanderSloot at uvt dot nl
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31401
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug libstdc++/31401] string find behaves strange when searching from npos
2007-03-30 14:53 [Bug libstdc++/31401] New: string find behaves strange when searching from npos Ko dot vanderSloot at uvt dot nl
@ 2007-03-30 16:26 ` pcarlini at suse dot de
2007-03-30 16:52 ` pcarlini at suse dot de
` (6 subsequent siblings)
7 siblings, 0 replies; 9+ messages in thread
From: pcarlini at suse dot de @ 2007-03-30 16:26 UTC (permalink / raw)
To: gcc-bugs
------- Comment #1 from pcarlini at suse dot de 2007-03-30 17:25 -------
Yes, this is stupid bug, it's an unintended behavior caused by unsigned
overflow. Will be fixed before the end of the day, but isn't a regression, thus
only in 4_2-branch and mainline.
--
pcarlini at suse dot de changed:
What |Removed |Added
----------------------------------------------------------------------------
AssignedTo|unassigned at gcc dot gnu |pcarlini at suse dot de
|dot org |
Status|UNCONFIRMED |ASSIGNED
Ever Confirmed|0 |1
Last reconfirmed|0000-00-00 00:00:00 |2007-03-30 17:25:41
date| |
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31401
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug libstdc++/31401] string find behaves strange when searching from npos
2007-03-30 14:53 [Bug libstdc++/31401] New: string find behaves strange when searching from npos Ko dot vanderSloot at uvt dot nl
2007-03-30 16:26 ` [Bug libstdc++/31401] " pcarlini at suse dot de
@ 2007-03-30 16:52 ` pcarlini at suse dot de
2007-03-30 17:11 ` paolo at gcc dot gnu dot org
` (5 subsequent siblings)
7 siblings, 0 replies; 9+ messages in thread
From: pcarlini at suse dot de @ 2007-03-30 16:52 UTC (permalink / raw)
To: gcc-bugs
--
pcarlini at suse dot de changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|--- |4.2.0
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31401
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug libstdc++/31401] string find behaves strange when searching from npos
2007-03-30 14:53 [Bug libstdc++/31401] New: string find behaves strange when searching from npos Ko dot vanderSloot at uvt dot nl
2007-03-30 16:26 ` [Bug libstdc++/31401] " pcarlini at suse dot de
2007-03-30 16:52 ` pcarlini at suse dot de
@ 2007-03-30 17:11 ` paolo at gcc dot gnu dot org
2007-03-30 17:12 ` paolo at gcc dot gnu dot org
` (4 subsequent siblings)
7 siblings, 0 replies; 9+ messages in thread
From: paolo at gcc dot gnu dot org @ 2007-03-30 17:11 UTC (permalink / raw)
To: gcc-bugs
------- Comment #2 from paolo at gcc dot gnu dot org 2007-03-30 18:11 -------
Subject: Bug 31401
Author: paolo
Date: Fri Mar 30 18:10:50 2007
New Revision: 123361
URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=123361
Log:
2007-03-30 Paolo Carlini <pcarlini@suse.de>
PR libstdc++/31401
* include/bits/basic_string.tcc (find(const _CharT*, size_type,
size_type)): Avoid unsigned overflow.
* testsuite/21_strings/basic_string/find/char/4.cc: New.
* testsuite/21_strings/basic_string/find/wchar_t/4.cc: Likewise.
Added:
trunk/libstdc++-v3/testsuite/21_strings/basic_string/find/char/4.cc
trunk/libstdc++-v3/testsuite/21_strings/basic_string/find/wchar_t/4.cc
Modified:
trunk/libstdc++-v3/ChangeLog
trunk/libstdc++-v3/include/bits/basic_string.tcc
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31401
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug libstdc++/31401] string find behaves strange when searching from npos
2007-03-30 14:53 [Bug libstdc++/31401] New: string find behaves strange when searching from npos Ko dot vanderSloot at uvt dot nl
` (2 preceding siblings ...)
2007-03-30 17:11 ` paolo at gcc dot gnu dot org
@ 2007-03-30 17:12 ` paolo at gcc dot gnu dot org
2007-03-30 17:13 ` pcarlini at suse dot de
` (3 subsequent siblings)
7 siblings, 0 replies; 9+ messages in thread
From: paolo at gcc dot gnu dot org @ 2007-03-30 17:12 UTC (permalink / raw)
To: gcc-bugs
------- Comment #3 from paolo at gcc dot gnu dot org 2007-03-30 18:11 -------
Subject: Bug 31401
Author: paolo
Date: Fri Mar 30 18:11:22 2007
New Revision: 123362
URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=123362
Log:
2007-03-30 Paolo Carlini <pcarlini@suse.de>
PR libstdc++/31401
* include/bits/basic_string.tcc (find(const _CharT*, size_type,
size_type)): Avoid unsigned overflow.
* testsuite/21_strings/basic_string/find/char/4.cc: New.
* testsuite/21_strings/basic_string/find/wchar_t/4.cc: Likewise.
Added:
branches/gcc-4_2-branch/libstdc++-v3/testsuite/21_strings/basic_string/find/char/4.cc
branches/gcc-4_2-branch/libstdc++-v3/testsuite/21_strings/basic_string/find/wchar_t/4.cc
Modified:
branches/gcc-4_2-branch/libstdc++-v3/ChangeLog
branches/gcc-4_2-branch/libstdc++-v3/include/bits/basic_string.tcc
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31401
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug libstdc++/31401] string find behaves strange when searching from npos
2007-03-30 14:53 [Bug libstdc++/31401] New: string find behaves strange when searching from npos Ko dot vanderSloot at uvt dot nl
` (3 preceding siblings ...)
2007-03-30 17:12 ` paolo at gcc dot gnu dot org
@ 2007-03-30 17:13 ` pcarlini at suse dot de
2007-04-02 10:09 ` paolo at gcc dot gnu dot org
` (2 subsequent siblings)
7 siblings, 0 replies; 9+ messages in thread
From: pcarlini at suse dot de @ 2007-03-30 17:13 UTC (permalink / raw)
To: gcc-bugs
------- Comment #4 from pcarlini at suse dot de 2007-03-30 18:12 -------
Fixed for 4.2.0.
--
pcarlini at suse dot de changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution| |FIXED
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31401
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug libstdc++/31401] string find behaves strange when searching from npos
2007-03-30 14:53 [Bug libstdc++/31401] New: string find behaves strange when searching from npos Ko dot vanderSloot at uvt dot nl
` (5 preceding siblings ...)
2007-04-02 10:09 ` paolo at gcc dot gnu dot org
@ 2007-04-02 10:09 ` paolo at gcc dot gnu dot org
2007-07-11 18:20 ` pcarlini at suse dot de
7 siblings, 0 replies; 9+ messages in thread
From: paolo at gcc dot gnu dot org @ 2007-04-02 10:09 UTC (permalink / raw)
To: gcc-bugs
------- Comment #6 from paolo at gcc dot gnu dot org 2007-04-02 11:09 -------
Subject: Bug 31401
Author: paolo
Date: Mon Apr 2 11:09:07 2007
New Revision: 123423
URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=123423
Log:
2007-04-02 Paolo Carlini <pcarlini@suse.de>
PR libstdc++/31401 (vstring bits)
* include/ext/vstring.tcc (find(const _CharT*, size_type,
size_type)): Avoid unsigned overflow.
Modified:
branches/gcc-4_2-branch/libstdc++-v3/ChangeLog
branches/gcc-4_2-branch/libstdc++-v3/include/ext/vstring.tcc
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31401
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug libstdc++/31401] string find behaves strange when searching from npos
2007-03-30 14:53 [Bug libstdc++/31401] New: string find behaves strange when searching from npos Ko dot vanderSloot at uvt dot nl
` (4 preceding siblings ...)
2007-03-30 17:13 ` pcarlini at suse dot de
@ 2007-04-02 10:09 ` paolo at gcc dot gnu dot org
2007-04-02 10:09 ` paolo at gcc dot gnu dot org
2007-07-11 18:20 ` pcarlini at suse dot de
7 siblings, 0 replies; 9+ messages in thread
From: paolo at gcc dot gnu dot org @ 2007-04-02 10:09 UTC (permalink / raw)
To: gcc-bugs
------- Comment #5 from paolo at gcc dot gnu dot org 2007-04-02 11:09 -------
Subject: Bug 31401
Author: paolo
Date: Mon Apr 2 11:08:50 2007
New Revision: 123422
URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=123422
Log:
2007-04-02 Paolo Carlini <pcarlini@suse.de>
PR libstdc++/31401 (vstring bits)
* include/ext/vstring.tcc (find(const _CharT*, size_type,
size_type)): Avoid unsigned overflow.
Modified:
trunk/libstdc++-v3/ChangeLog
trunk/libstdc++-v3/include/ext/vstring.tcc
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31401
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug libstdc++/31401] string find behaves strange when searching from npos
2007-03-30 14:53 [Bug libstdc++/31401] New: string find behaves strange when searching from npos Ko dot vanderSloot at uvt dot nl
` (6 preceding siblings ...)
2007-04-02 10:09 ` paolo at gcc dot gnu dot org
@ 2007-07-11 18:20 ` pcarlini at suse dot de
7 siblings, 0 replies; 9+ messages in thread
From: pcarlini at suse dot de @ 2007-07-11 18:20 UTC (permalink / raw)
To: gcc-bugs
------- Comment #7 from pcarlini at suse dot de 2007-07-11 18:20 -------
*** Bug 32730 has been marked as a duplicate of this bug. ***
--
pcarlini at suse dot de changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |gnu at bluedreamer dot com
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31401
^ permalink raw reply [flat|nested] 9+ messages in thread
end of thread, other threads:[~2007-07-11 18:20 UTC | newest]
Thread overview: 9+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2007-03-30 14:53 [Bug libstdc++/31401] New: string find behaves strange when searching from npos Ko dot vanderSloot at uvt dot nl
2007-03-30 16:26 ` [Bug libstdc++/31401] " pcarlini at suse dot de
2007-03-30 16:52 ` pcarlini at suse dot de
2007-03-30 17:11 ` paolo at gcc dot gnu dot org
2007-03-30 17:12 ` paolo at gcc dot gnu dot org
2007-03-30 17:13 ` pcarlini at suse dot de
2007-04-02 10:09 ` paolo at gcc dot gnu dot org
2007-04-02 10:09 ` paolo at gcc dot gnu dot org
2007-07-11 18:20 ` pcarlini at suse dot de
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).