2003-06-05  Benjamin Kosnik  <bkoz@redhat.com>

	PR libstdc++/9024
	* include/bits/fstream.tcc (_M_underflow): Fix for unbuffered.
	* include/bits/stl_algobase.h: Tweak.
	* include/std/std_fstream.h: Move _M_buf_size to...
	* include/std/std_streambuf.h: ...here. Modify.
	* include/bits/streambuf.tcc: Same.
	* testsuite/testsuite_hooks.h: Tweak.
	* testsuite/testsuite_io.h (constraint_filebuf): New.
	* testsuite/27_io/basic_filebuf/sbumpc/char/1.cc: Split into...
	* testsuite/27_io/basic_filebuf/sbumpc/char/1-in.cc: New.
	* testsuite/27_io/basic_filebuf/sbumpc/char/1-io.cc: New.
	* testsuite/27_io/basic_filebuf/sbumpc/char/1-out.cc: New.
	* testsuite/27_io/basic_filebuf/sbumpc/char/2-in.cc: New.
	* testsuite/27_io/basic_filebuf/sbumpc/char/2-io.cc: New.
	* testsuite/27_io/basic_filebuf/sbumpc/char/2-out.cc: New.
	* testsuite/27_io/basic_filebuf/sgetc/char/1.cc: Split into...
	* testsuite/27_io/basic_filebuf/sgetc/char/1-in.cc: New.
	* testsuite/27_io/basic_filebuf/sgetc/char/1-io.cc: New.
	* testsuite/27_io/basic_filebuf/sgetc/char/1-out.cc: New.
	* testsuite/27_io/basic_filebuf/sgetc/char/2-in.cc: New.
	* testsuite/27_io/basic_filebuf/sgetc/char/2-io.cc: New.
	* testsuite/27_io/basic_filebuf/sgetc/char/2-out.cc: New.
	* testsuite/27_io/basic_filebuf/sgetn/char/1.cc: Split into...
	* testsuite/27_io/basic_filebuf/sgetn/char/1-in.cc: New.
	* testsuite/27_io/basic_filebuf/sgetn/char/1-io.cc: New.
	* testsuite/27_io/basic_filebuf/sgetn/char/1-out.cc: New.
	* testsuite/27_io/basic_filebuf/sgetn/char/2.cc: Split into...
	* testsuite/27_io/basic_filebuf/sgetn/char/2-in.cc: New.
	* testsuite/27_io/basic_filebuf/sgetn/char/2-io.cc: New.
	* testsuite/27_io/basic_filebuf/sgetn/char/2-out.cc: New.
	* testsuite/27_io/basic_filebuf/sgetn/char/3.cc: New.
	* testsuite/27_io/basic_filebuf/snextc/char/1.cc: Split into...
	* testsuite/27_io/basic_filebuf/snextc/char/1-in.cc: New.
	* testsuite/27_io/basic_filebuf/snextc/char/1-io.cc: New.
	* testsuite/27_io/basic_filebuf/snextc/char/1-out.cc: New.
	* testsuite/27_io/basic_filebuf/snextc/char/2-in.cc: New.
	* testsuite/27_io/basic_filebuf/snextc/char/2-io.cc: New.
	* testsuite/27_io/basic_filebuf/snextc/char/2-out.cc: New.
	* testsuite/27_io/basic_filebuf/sputc/char/1.cc: Split into...
	* testsuite/27_io/basic_filebuf/sputc/char/1-in.cc: New.
	* testsuite/27_io/basic_filebuf/sputc/char/1-io.cc: New.
	* testsuite/27_io/basic_filebuf/sputc/char/1-out.cc: New.
	* testsuite/27_io/basic_filebuf/sputc/char/2.cc: Split into...
	* testsuite/27_io/basic_filebuf/sputc/char/2-in.cc: New.
	* testsuite/27_io/basic_filebuf/sputc/char/2-io.cc: New.
	* testsuite/27_io/basic_filebuf/sputc/char/2-out.cc: New.
	* testsuite/27_io/basic_filebuf/sputn/char/1.cc: Split into...
	* testsuite/27_io/basic_filebuf/sputn/char/1-in.cc: New.
	* testsuite/27_io/basic_filebuf/sputn/char/1-io.cc: New.
	* testsuite/27_io/basic_filebuf/sputn/char/1-out.cc: New.
	* testsuite/27_io/basic_filebuf/sputn/char/2-in.cc: New.
	* testsuite/27_io/basic_filebuf/sputn/char/2-io.cc: New.
	* testsuite/27_io/basic_filebuf/sputn/char/2-out.cc: New.
	* testsuite/data/sgetc.txt: New.
	* testsuite/data/sgetn.txt: New.

From-SVN: r67524