Fix handling of collating symbols in fnmatch (bug 26620)

The variable idx contains the index into the extra array, whereas wextra
points into the extra array at this index, containing the length of the
following collating sequence in the wide character representation.

1 files changed, 37 insertions, 0 deletions

diff --git a/posix/tst-fnmatch6.c b/posix/tst-fnmatch6.c
new file mode 100644
index 0000000000..c255702a72
--- /dev/null
+++ b/posix/tst-fnmatch6.c
@@ -0,0 +1,37 @@
+/* Test for fnmatch handling of collating symbols (bug 26620)
+   Copyright (C) 2020 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#include <fnmatch.h>
+#include <locale.h>
+#include <support/check.h>
+#include <support/support.h>
+
+static int
+do_test (void)
+{
+  xsetlocale (LC_ALL, "en_US.UTF-8");
+  /* From iso14651_t1_common:
+     collating-element <U004C_00B7> from "<U004C><U00B7>"
+     % decomposition of LATIN CAPITAL LETTER L WITH MIDDLE DOT */
+  TEST_VERIFY (fnmatch ("[[.L\xc2\xb7.]]", ".", 0) != 0);
+  TEST_VERIFY (fnmatch ("[[.L\xc2\xb7.]]", "L\xc2\xb7", 0) == 0);
+
+  return 0;
+}
+
+#include <support/test-driver.c>