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* Re: libstdc++/9425: filebuf::pbackfail broken
@ 2003-02-02 21:03 paolo
0 siblings, 0 replies; 3+ messages in thread
From: paolo @ 2003-02-02 21:03 UTC (permalink / raw)
To: gcc-bugs, gcc-prs, nobody, paolo, peturr02
Synopsis: filebuf::pbackfail broken
Responsible-Changed-From-To: unassigned->paolo
Responsible-Changed-By: paolo
Responsible-Changed-When: Sun Feb 2 21:03:54 2003
Responsible-Changed-Why:
Analyzing.
State-Changed-From-To: open->analyzed
State-Changed-By: paolo
State-Changed-When: Sun Feb 2 21:03:54 2003
State-Changed-Why:
Confirmed: the seekoff corresponding to fb02.sputbackc fails.
http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=9425
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: libstdc++/9425: filebuf::pbackfail broken
@ 2003-02-05 19:22 paolo
0 siblings, 0 replies; 3+ messages in thread
From: paolo @ 2003-02-05 19:22 UTC (permalink / raw)
To: gcc-bugs, gcc-prs, paolo, peturr02
Synopsis: filebuf::pbackfail broken
State-Changed-From-To: analyzed->closed
State-Changed-By: paolo
State-Changed-When: Wed Feb 5 19:22:57 2003
State-Changed-Why:
Fixed for 3.3 and 3.4.
http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=9425
^ permalink raw reply [flat|nested] 3+ messages in thread
* libstdc++/9425: filebuf::pbackfail broken
@ 2003-01-23 19:06 peturr02
0 siblings, 0 replies; 3+ messages in thread
From: peturr02 @ 2003-01-23 19:06 UTC (permalink / raw)
To: gcc-gnats
>Number: 9425
>Category: libstdc++
>Synopsis: filebuf::pbackfail broken
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: unassigned
>State: open
>Class: sw-bug
>Submitter-Id: net
>Arrival-Date: Thu Jan 23 19:06:01 UTC 2003
>Closed-Date:
>Last-Modified:
>Originator: peturr02@ru.is
>Release: gcc-3.2.1
>Organization:
>Environment:
Red Hat Linux 8.0
>Description:
basic_filebuf<>::pbackfail calls basic_filebuf<>::seekoff, but fails to check the return value. If seekoff fails for some reason (including, but not limited to codecvt<>::encoding() <= 0), strange things happen.
>How-To-Repeat:
See attachment.
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted:
----gnatsweb-attachment----
Content-Type: text/plain; name="pbackfailbug.cc"
Content-Disposition: inline; filename="pbackfailbug.cc"
#include <fstream>
#include <locale>
#include <cstdio>
#include <cwchar>
#undef NDEBUG
#include <cassert>
using namespace std;
class Variable : public codecvt<char, char, mbstate_t>
{
int do_encoding() const throw() { return 0; }
};
int main()
{
char buf[BUFSIZ];
filebuf fb01;
fb01.open("filebuf_virtuals-1.txt", ios_base::in);
streamsize sz1 = fb01.sgetn(buf, BUFSIZ);
assert(sz1 == BUFSIZ);
fb01.sgetc();
int n1 = fb01.sputbackc('a');
if (n1 == EOF)
return 0;
streamsize sz2 = fb01.sgetn(buf, BUFSIZ);
assert(buf[0] == 'a');
fb01.close();
filebuf fb02;
locale loc;
loc = locale(loc, new Variable);
fb02.pubimbue(loc);
fb02.open("filebuf_virtuals-1.txt", ios_base::in);
streamsize sz3 = fb02.sgetn(buf, BUFSIZ);
assert(sz3 == BUFSIZ);
fb02.sgetc();
int n2 = fb02.sputbackc('a');
if (n2 == EOF)
return 0;
streamsize sz4 = fb02.sgetn(buf, BUFSIZ);
assert(buf[0] == 'a');
assert(sz4 == sz2);
return 0;
}
^ permalink raw reply [flat|nested] 3+ messages in thread
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2003-02-02 21:03 libstdc++/9425: filebuf::pbackfail broken paolo
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2003-02-05 19:22 paolo
2003-01-23 19:06 peturr02
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