source: kBuild/trunk/src/grep/tests/empty-line

#! /bin/sh
# Test that the empty pattern matches everything.
# Some of these tests failed in grep 2.18.

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

fail=0
printf 'abc\n' >in || framework_failure_
nl='
'

for opt in '' -E -F; do
  case $opt in
    '') prefix='\(\)\1';;
    -E) prefix='()\1';;
    -F) prefix="foo$nl";;
  esac

  for pattern in "" "$nl" "---$nl" "${nl}foo"; do
    for pat in "$pattern" "$prefix$pattern"; do
      grep $opt -e "$pat" in >out || fail=1
      compare in out || fail=1

      printf -- '%s\n' "$pat" >pat || framework_failure_
      grep $opt -f pat in >out || fail=1
      compare in out || fail=1

      # Check that pattern files that end in non-newlines
      # are treated as if a newline were appended.
      case $pattern in
        '' | *"$nl") ;;
        *)
          printf -- '%s' "$pat" >pat || framework_failure_
          grep $opt -f pat in >out || fail=1
          compare in out || fail=1;;
      esac
    done
  done
done

Exit $fail