[v3] 9371/9546/10093/10095

[Benjamin Kosnik]

Fixes for longstanding exception handling bugs. No doubt there are more,
but this at least clears the way for them to be considered. There is
associated documentation that is unfinished but that I intend to check
in at a later date.

I think the inserters and extractors for streambufs are correct now, but
the new tests diverge from what is in 9371. Petur, you should probably
double check these.

tested x86/linux

This should probably be considered for gcc-3_3-branch after it mellows a
bit on mainline. I'll deal with this when I get back from hunting
mistletoe in Texas. Gobble gobble.

-benjamin


2003-11-26  Benjamin Kosnik  <bkoz@redhat.com>

	PR libstdc++/9371
	PR libstdc++/9546
	PR libstdc++/10093
	PR libstdc++/10095
	* include/bits/basic_ios.h (basic_ios::setstate): Elide if goodbit.
	(basic_ios::_M_setstate): Consolidate common error handling code.
	* include/bits/basic_ios.tcc: Tweak.
	* include/bits/fstream.tcc: Tweak.
	* include/bits/istream.tcc: Use _M_setstate for common exception
	handling. Move setstate calls after catch. 
	(basic_istream::tellg): Check for exceptions thrown by streambuf
	virtual functions.
	(basic_istream::seekg): Same.
	* include/bits/ostream.tcc: Same, but for ostream.
	(basic_ostream::flush): Check for exceptions thrown by streambuf
	virtual functions.
	(basic_istream::tellp): Same.	
	(basic_istream::seekp): Same.
	* include/bits/locale_facets.tcc: Tweak.
	* include/bits/streambuf.tcc: Tweak.
	(__copy_streambufs): Propagate exceptions.
	* testsuite/testsuite_io.h (fail_streambuf): New.
	(fail_num_get): New.
	(fail_num_put): New.
	(facet_error): New.
	(underflow_error): New.
	(overflow_error): New.	
	(positioning_error): New.	
	* testsuite/27_io/basic_istream/exceptions/char/9561.cc: Tweak.
	* testsuite/27_io/basic_istream/extractors_arithmetic/char/
        exceptions_badbit_throw.cc, exceptions_failbit.cc,
        exceptions_failbit_throw.cc: New.
	* testsuite/27_io/basic_istream/extractors_other/char/
	error_failbit.cc, exceptions_badbit_throw.cc,
        exceptions_failbit_throw.cc, exceptions_null.cc: New.
	* testsuite/27_io/basic_istream/seekg/char/exceptions_badbit_throw.cc: 
	New.
	* testsuite/27_io/basic_istream/tellg/char/exceptions_badbit_throw.cc:
	New.
	* testsuite/27_io/basic_ostream/flush/char/exceptions_badbit_throw.cc:
	New.
	* testsuite/27_io/basic_ostream/inserters_arithmetic/char/
	exceptions_badbit_throw.cc, exceptions_failbit_throw.cc: New.
	* testsuite/27_io/basic_ostream/inserters_other/char/
	error_failbit.cc, exceptions_badbit_throw.cc,
        exceptions_failbit_throw.cc, exceptions_null.cc: New.
	* testsuite/27_io/basic_ostream/seekp/char/exceptions_badbit_throw.cc: 
	New.
	* testsuite/27_io/basic_ostream/tellp/char/exceptions_badbit_throw.cc: 
	New.
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