libstdc++: Poor man's case insensitive comparisons in time_get [PR71557]

This patch uses the same not completely correct case insensitive comparisons
as used elsewhere in the same header.  Proper comparisons that would handle
even multi-byte characters would be harder, but I don't see them implemented
in __ctype's methods.

2021-12-15  Jakub Jelinek  <jakub@redhat.com>

	PR libstdc++/71557
	* include/bits/locale_facets_nonio.tcc (_M_extract_via_format):
	Compare characters other than format specifiers and whitespace
	case insensitively.
	(_M_extract_name): Compare characters case insensitively.
	* testsuite/22_locale/time_get/get/char/71557.cc: New test.
	* testsuite/22_locale/time_get/get/wchar_t/71557.cc: New test.

2 files changed, 192 insertions, 0 deletions

diff --git a/libstdc++-v3/testsuite/22_locale/time_get/get/char/71557.cc b/libstdc++-v3/testsuite/22_locale/time_get/get/char/71557.cc
new file mode 100644
index 0000000..a0214c2
--- /dev/null
+++ b/libstdc++-v3/testsuite/22_locale/time_get/get/char/71557.cc
@@ -0,0 +1,96 @@
+// { dg-do run { target c++11 } }
+
+// Copyright (C) 2021 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3.  If not see
+// <http://www.gnu.org/licenses/>.
+
+#include <locale>
+#include <sstream>
+#include <iterator>
+#include <testsuite_hooks.h>
+
+void
+test01()
+{
+  using namespace std;
+
+  locale loc_c = locale::classic();
+
+  istringstream iss;
+  iss.imbue(loc_c);
+  const time_get<char>& tget = use_facet<time_get<char>>(iss.getloc());
+  typedef istreambuf_iterator<char> iter;
+  const iter end;
+
+  tm time;
+  ios_base::iostate err = ios_base::badbit;
+
+  iss.str("20:48:01 MAR 31 2016");
+  string format = "%H:%M:%S %b %d %Y";
+  auto ret = tget.get(iter(iss), end, iss, err, &time,
+		      format.data(), format.data()+format.size());
+  VERIFY( err == ios_base::eofbit );
+  VERIFY( ret == end );
+  VERIFY( time.tm_year == 2016 - 1900 );
+  VERIFY( time.tm_mon == 2 );
+  VERIFY( time.tm_mday == 31 );
+  VERIFY( time.tm_hour == 20 );
+  VERIFY( time.tm_min == 48 );
+  VERIFY( time.tm_sec == 01 );
+
+  iss.str("21:38:11 apr 30 2017");
+  ret = tget.get(iter(iss), end, iss, err, &time,
+		 format.data(), format.data()+format.size());
+  VERIFY( err == ios_base::eofbit );
+  VERIFY( ret == end );
+  VERIFY( time.tm_year == 2017 - 1900 );
+  VERIFY( time.tm_mon == 3 );
+  VERIFY( time.tm_mday == 30 );
+  VERIFY( time.tm_hour == 21 );
+  VERIFY( time.tm_min == 38 );
+  VERIFY( time.tm_sec == 11 );
+
+  iss.str("22:28:21 mAy 29 2018");
+  ret = tget.get(iter(iss), end, iss, err, &time,
+		 format.data(), format.data()+format.size());
+  VERIFY( err == ios_base::eofbit );
+  VERIFY( ret == end );
+  VERIFY( time.tm_year == 2018 - 1900 );
+  VERIFY( time.tm_mon == 4 );
+  VERIFY( time.tm_mday == 29 );
+  VERIFY( time.tm_hour == 22 );
+  VERIFY( time.tm_min == 28 );
+  VERIFY( time.tm_sec == 21 );
+
+  iss.str("23:18:31 JuN 28 2019");
+  ret = tget.get(iter(iss), end, iss, err, &time,
+		 format.data(), format.data()+format.size());
+  VERIFY( err == ios_base::eofbit );
+  VERIFY( ret == end );
+  VERIFY( time.tm_year == 2019 - 1900 );
+  VERIFY( time.tm_mon == 5 );
+  VERIFY( time.tm_mday == 28 );
+  VERIFY( time.tm_hour == 23 );
+  VERIFY( time.tm_min == 18 );
+  VERIFY( time.tm_sec == 31 );
+}
+
+int
+main()
+{
+  test01();
+  return 0;
+}
diff --git a/libstdc++-v3/testsuite/22_locale/time_get/get/wchar_t/71557.cc b/libstdc++-v3/testsuite/22_locale/time_get/get/wchar_t/71557.cc
new file mode 100644
index 0000000..ed6af05
--- /dev/null
+++ b/libstdc++-v3/testsuite/22_locale/time_get/get/wchar_t/71557.cc
@@ -0,0 +1,96 @@
+// { dg-do run { target c++11 } }
+
+// Copyright (C) 2021 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3.  If not see
+// <http://www.gnu.org/licenses/>.
+
+#include <locale>
+#include <sstream>
+#include <iterator>
+#include <testsuite_hooks.h>
+
+void
+test01()
+{
+  using namespace std;
+
+  locale loc_c = locale::classic();
+
+  wistringstream iss;
+  iss.imbue(loc_c);
+  const time_get<wchar_t>& tget = use_facet<time_get<wchar_t>>(iss.getloc());
+  typedef istreambuf_iterator<wchar_t> iter;
+  const iter end;
+
+  tm time;
+  ios_base::iostate err = ios_base::badbit;
+
+  iss.str(L"20:48:01 MAR 31 2016");
+  wstring format = L"%H:%M:%S %b %d %Y";
+  auto ret = tget.get(iter(iss), end, iss, err, &time,
+		      format.data(), format.data()+format.size());
+  VERIFY( err == ios_base::eofbit );
+  VERIFY( ret == end );
+  VERIFY( time.tm_year == 2016 - 1900 );
+  VERIFY( time.tm_mon == 2 );
+  VERIFY( time.tm_mday == 31 );
+  VERIFY( time.tm_hour == 20 );
+  VERIFY( time.tm_min == 48 );
+  VERIFY( time.tm_sec == 01 );
+
+  iss.str(L"21:38:11 apr 30 2017");
+  ret = tget.get(iter(iss), end, iss, err, &time,
+		 format.data(), format.data()+format.size());
+  VERIFY( err == ios_base::eofbit );
+  VERIFY( ret == end );
+  VERIFY( time.tm_year == 2017 - 1900 );
+  VERIFY( time.tm_mon == 3 );
+  VERIFY( time.tm_mday == 30 );
+  VERIFY( time.tm_hour == 21 );
+  VERIFY( time.tm_min == 38 );
+  VERIFY( time.tm_sec == 11 );
+
+  iss.str(L"22:28:21 mAy 29 2018");
+  ret = tget.get(iter(iss), end, iss, err, &time,
+		 format.data(), format.data()+format.size());
+  VERIFY( err == ios_base::eofbit );
+  VERIFY( ret == end );
+  VERIFY( time.tm_year == 2018 - 1900 );
+  VERIFY( time.tm_mon == 4 );
+  VERIFY( time.tm_mday == 29 );
+  VERIFY( time.tm_hour == 22 );
+  VERIFY( time.tm_min == 28 );
+  VERIFY( time.tm_sec == 21 );
+
+  iss.str(L"23:18:31 JuN 28 2019");
+  ret = tget.get(iter(iss), end, iss, err, &time,
+		 format.data(), format.data()+format.size());
+  VERIFY( err == ios_base::eofbit );
+  VERIFY( ret == end );
+  VERIFY( time.tm_year == 2019 - 1900 );
+  VERIFY( time.tm_mon == 5 );
+  VERIFY( time.tm_mday == 28 );
+  VERIFY( time.tm_hour == 23 );
+  VERIFY( time.tm_min == 18 );
+  VERIFY( time.tm_sec == 31 );
+}
+
+int
+main()
+{
+  test01();
+  return 0;
+}