istream.tcc (ignore): Correctly deal with n == numeric_limits<streamsize>::max().

2004-05-24  Paolo Carlini  <pcarlini@suse.de>

	* include/bits/istream.tcc (ignore): Correctly deal with
	n == numeric_limits<streamsize>::max().
	* testsuite/27_io/basic_istream/ignore/char/2.cc: New.

	* include/bits/istream.tcc (basic_istream<>::getline): Prefer
	'_M_gcount + 1 < __n' to '--__n; _M_gcount < __n', just in case
	__n == numeric_limits<>::min().

	* include/bits/istream.tcc: Minor tweaks.

	* testsuite/21_strings/basic_string/inserters_extractors/char/10.cc:
	Tighten.
	* testsuite/21_strings/basic_string/inserters_extractors/char/11.cc:
	Likewise.
	* testsuite/21_strings/basic_string/inserters_extractors/wchar_t/10.cc:
	Likewise.
	* testsuite/21_strings/basic_string/inserters_extractors/wchar_t/11.cc:
	Likewise.
	* testsuite/27_io/basic_istream/getline/char/5.cc: Likewise.

From-SVN: r82198