#!/bin/sh
# grep -z with an anchor in the regex could mistakenly match text
# including a newline.

# Copyright 2016-2017 Free Software Foundation, Inc.

# This program 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 of the License, or
# (at your option) any later version.

# This program 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 program.  If not, see <http://www.gnu.org/licenses/>.

. "${srcdir=.}/init.sh"; path_prepend_ ../src

require_en_utf8_locale_
require_compiled_in_MB_support
LC_ALL=en_US.UTF-8

printf 'a\nb\0' > in || framework_failure_

fail=0

# These three would all mistakenly match, because the [a-b] range
# forced the non-DFA (regexp-using) code path.
returns_ 1 grep -z '^[a-b]*$' in || fail=1
returns_ 1 grep -z 'a[a-b]*$' in || fail=1
returns_ 1 grep -z '^[a-b]*b' in || fail=1

# Test these for good measure; they exercise the DFA code path
# and always worked
returns_ 1 grep -z '^[ab]*$' in || fail=1
returns_ 1 grep -z 'a[ab]*$' in || fail=1
returns_ 1 grep -z '^[ab]*b' in || fail=1

Exit $fail