PR libstdc++/9404, PR libstdc++/9701 (partial)

2003-02-24  Paolo Carlini <pcarlini@unitus.it>
	    Nathan Myers <ncm@cantrip.org>

	PR libstdc++/9404, PR libstdc++/9701 (partial)
	(aka pptr == epptr implies overflow)
	* include/bits/fstream.tcc (_M_allocate_internal_buffer):
	Consistently, _M_out_end points to the end of the buffer just
	created.
	(overflow): Tweak to use _M_out_buf_size().
	(_M_convert_to_external): The role of the old _M_out_end is
	now played by _M_out_lim.
	(_M_really_overflow): Likewise.
	(seekoff): Likewise.
	(setbuf): _M_out_end points to the end of the external buffer.
	* include/bits/sstream.tcc (overflow): Rewrote, taking into
	account the resolution of DR 169 (TC).
	(seekoff): Use _M_string.capacity(); ios_base::end is now _M_out_lim.
	(seekpos): Use _M_string.capacity(); tweak.
	* include/bits/streambuf.tcc (sputc, xsputn): Remove comments.
	* include/std/std_fstream.h (sync): The role of the old
	_M_out_end is now played by _M_out_lim.
	(_M_set_indeterminate): Use _M_set_determinate.
	(_M_set_determinate): _M_out_end is now _M_out_lim.
	(_M_is_indeterminate): Likewise.
	* include/std/std_sstream.h (str()): _M_out_end is now _M_out_lim.
	(_M_stringbuf_init): Don't set _M_buf_size, unused for sstreams,
	which have the information readily available as _M_string.capacity();
	for ate and app modes, pass the string size to _M_really_sync.
	(_M_really_sync): Consistently set _M_out_end and _M_out_lim, to
	point to the end of the buffer (i.e., epptr) and to the string end,
	respectively.
	* include/std/std_streambuf.h: tweak comments, add _M_out_lim,
	which points to the right limit of the used put area.
	(_M_out_cur_move): The role of the old _M_out_end is now played
	by _M_out_lim.
	(_M_out_buf_size): Simplify: now (when _M_out_cur) return simply
	_M_out_end  - _M_out_cur (i.e., pptr), _very_ close to the letter
	of the standard.
	(basic_streambuf()): Initialize _M_out_lim too.
	* testsuite/27_io/filebuf_virtuals.cc (test10): Trivial tweak.
	* testsuite/27_io/filebuf_virtuals.cc (test11): Add.
 	* testsuite/27_io/stringbuf_virtuals.cc (test09): Add.

Co-Authored-By: Nathan Myers <ncm@cantrip.org>

From-SVN: r63367