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Date: Tue, 07 May 2002 07:56:00 -0000
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Subject: libstdc++/6594: strstreambuf leaks 16 bytes - gcc 3.0.x
X-SW-Source: 2002-05/txt/msg00191.txt.bz2
List-Id: <gcc-prs.sourceware.org>


>Number:         6594
>Category:       libstdc++
>Synopsis:       strstreambuf leaks 16 bytes - gcc 3.0.x
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Tue May 07 07:56:00 PDT 2002
>Closed-Date:
>Last-Modified:
>Originator:     Ed Hourigan
>Release:        gcc 3.0.4
>Organization:
>Environment:
Red Hat Linux 7.2 on x86 processor
>Description:
The default constructor for strstreambuf allocates a
buffer of 16 bytes.  If you assign a user supplied
buffer by calling setp(...), then the 16 byte buffer is
not released and the pointer is lost.
I have verified this leak using the linux tool 'memprof'

Sample code:
( I am deriving a class from strstreambuf so I can control
  where the output stream goes )

class MyStreambuf : public strstreambuf 
{
public:

    MyStreambuf()
    {
       setp( _buffer, _buffer, _buffer+BUFSIZE );  // leak 
here!
    ...

    }

private:
    static const int BUFSIZE=256;
    char _buffer[BUFSIZE];
}
>How-To-Repeat:

>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted: