source: kBuild/vendor/grep/2.12/tests/unibyte-bracket-expr

#!/bin/sh
# Exercise a DFA range bug that arises only with a unibyte encoding
# for which the wide-char-to-single-byte mapping is nontrivial.
# E.g., the regexp, [C] would fail to match C in a unibyte locale like
# ru_RU.KOI8-R for any C whose wide-char representation differed from
# its single-byte equivalent.

# Copyright (C) 2011-2012 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_ru_RU_koi8_r
LC_ALL=ru_RU.KOI8-R
export LC_ALL

fail=0

for i in 8 9 a b c d e f; do
  for j in 0 1 2 3 4 5 6 7 8 9 a b c d e f; do
    in=in-$i$j
    b=$(printf "\\x$i$j")
    echo "$b" > $in || framework_failure_
    grep "[$b]" $in > out || fail=1
    compare out $in || fail=1
  done
done

Exit $fail