#! /bin/sh
# Test for false matches in grep 2.19..2.26 in multibyte, non-UTF8 locales
#
# Copyright (C) 2016-2020 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

# Add "." to PATH for the use of get-mb-cur-max.
path_prepend_ .

fail=0

loc=zh_CN.gb18030
test "$(get-mb-cur-max $loc)" = 4 || skip_ "no support for the $loc locale"

# This must not match: the input is a single character, \uC9 followed
# by a newline.  But it just so happens that that character is made up
# of four bytes, the last of which is the digit, 7, and grep's DFA
# matcher would mistakenly report that ".*7" matches that input line.
printf '\2010\2077\n' > in || framework_failure_
returns_ 1 env LC_ALL=$loc grep -E '.*7' in || fail=1

returns_ 1 env LC_ALL=$loc grep -E '.{0,1}7' in || fail=1

returns_ 1 env LC_ALL=$loc grep -E '.?7' in || fail=1

# Similar for the \ue9 code point, which ends in an "m" byte.
loc=zh_HK.big5hkscs
test "$(get-mb-cur-max $loc)" = 2 || skip_ "no support for the $loc locale"

printf '\210m\n' > in || framework_failure_
returns_ 1 env LC_ALL=$loc grep '.*m' in || fail=1

Exit $fail