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2010-09-22 David Krauss <potswa@mac.com> PR libstdc++/45628 * include/bits/fstream.tcc (basic_filebuf::underflow): Add state transition to avoid modality requiring seekoff(0,ios::cur). (basic_filebuf::pbackfail): Likewise. (basic_filebuf::overflow): Likewise. (basic_filebuf::_M_seek): Avoid minor unnecessary conversion. (basic_filebuf::seekoff): Remove code to _M_get_ext_pos; make (0, ios::cur) a special case preserving buffer contents. (basic_filebuf::_M_get_ext_pos): New function to obtain status about codecvt extern_t buffer for overflow and seekoff. * include/std/fstream (basic_filebuf::_M_get_ext_pos): Likewise. * config/abi/pre/gnu.ver: Export new symbols. * testsuite/27_io/basic_filebuf/seekoff/char/45628-1.cc: New, verifies that seekoff(0, ios::cur) preserves buffers. * testsuite/27_io/basic_filebuf/seekoff/char/45628-2.cc: Likewise. for codecvt case. More lenient as it may still flush put area. * testsuite/27_io/basic_filebuf/seekoff/char/4.cc: Modify to check that seekoff is not required between read and write. * testsuite/27_io/basic_filebuf/seekoff/wchar_t/4.cc: Likewise. * testsuite/27_io/basic_filebuf/sync/wchar_t/1.cc: Remove. * testsuite/27_io/basic_filebuf/sync/wchar_t/1.cc: Likewise. * testsuite/util/testsuite_character.h (codecvt::do_length): Comply with 22.2.1.5.2/10 "Returns ... the LARGEST value in the range..." From-SVN: r164529
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