source: kBuild/trunk/src/grep/tests/backslash-s-and-repetition-operators

#! /bin/sh
# Ensure that \s and \S work with repetition operators.
#
# Copyright (C) 2013-2021 Free Software Foundation, Inc.
#
# Copying and distribution of this file, with or without modification,
# are permitted in any medium without royalty provided the copyright
# notice and this notice are preserved.

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

require_en_utf8_locale_

fail=0

for loc in en_US.UTF-8 C; do
  echo locale=$loc
  LC_ALL=$loc
  export LC_ALL

  printf ' \n' > in || framework_failure_

  for re in '\s\+' '\s*' '\s\?' '\s\{1\}'; do
    grep "^$re\$" in > out || fail=1
    compare in out || fail=1
  done

  printf 'X\n' > in || framework_failure_

  for re in '\S\+' '\S*' '\S\?' '\S\{1\}'; do
    grep "^$re\$" in > out || fail=1
    compare in out || fail=1
  done
done

Exit $fail