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From: peturr02@ru.is To: gcc-gnats@gcc.gnu.org Subject: libstdc++/9425: filebuf::pbackfail broken Date: Thu, 23 Jan 2003 19:06:00 -0000 [thread overview] Message-ID: <20030123190404.6059.qmail@sources.redhat.com> (raw) >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; }
next reply other threads:[~2003-01-23 19:06 UTC|newest] Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top 2003-01-23 19:06 peturr02 [this message] 2003-02-02 21:03 paolo 2003-02-05 19:22 paolo
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