Fix handling of unterminated bracket expressions in fnmatch (bug 28792)

When fnmatch processes a bracket expression, and eventually finds it to be
unterminated, it should rescan it, treating the starting bracket as a
normal character.  That didn't happen when a matching character was found
while scanning the bracket expression.

1 files changed, 37 insertions, 0 deletions

diff --git a/posix/tst-fnmatch7.c b/posix/tst-fnmatch7.c
new file mode 100644
index 0000000000..eda1bf9704
--- /dev/null
+++ b/posix/tst-fnmatch7.c
@@ -0,0 +1,37 @@
+/* Test for fnmatch handling of unterminated bracket expression (bug 28792)
+   Copyright (C) 2022 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 <support/check.h>
+
+static int
+do_test (void)
+{
+  /* An unterminated bracket expression should be rescanned, treating the
+     open bracket as a normal character.  The backslash causes the close
+     bracket to be treated as a normal character, not ending the bracket
+     expression.  */
+  TEST_VERIFY (fnmatch ("[", "[", 0) == 0);
+  TEST_VERIFY (fnmatch ("[[", "[[", 0) == 0);
+  TEST_VERIFY (fnmatch ("[\\]", "[]", 0) == 0);
+  TEST_VERIFY (fnmatch ("[[\\]", "[[]", 0) == 0);
+
+  return 0;
+}
+
+#include <support/test-driver.c>