unset LC_ALL
LC_CTYPE=en_US.UTF-8
export LC_CTYPE

c1=e
# a umlaut
c2=$(printf '\303\244')
# euro sign
c3=$(printf '\342\202\254')
# some sort of 't' outside BMP
c4=$(printf '\360\235\225\245')

s=$c1$c2$c3$c4

testcase() {
	code="$1"
	expected="$2"
	oIFS="$IFS"
	eval "$code"
	IFS='|'
	result="$#|$*"
	IFS="$oIFS"
	if [ "x$result" = "x$expected" ]; then
		ok=x$ok
	else
		failures=x$failures
		echo "For $code, expected $expected actual $result"
	fi
}

testcase 'set -- "$s"'				"1|$s"
testcase 'set -- "${s#$c2}"'			"1|$s"
testcase 'set -- "${s#*}"'			"1|$s"
testcase 'set -- "${s#$c1}"'			"1|$c2$c3$c4"
testcase 'set -- "${s#$c1$c2}"'			"1|$c3$c4"
testcase 'set -- "${s#$c1$c2$c3}"'		"1|$c4"
testcase 'set -- "${s#$c1$c2$c3$c4}"'		"1|"
testcase 'set -- "${s#?}"'			"1|$c2$c3$c4"
testcase 'set -- "${s#??}"'			"1|$c3$c4"
testcase 'set -- "${s#???}"'			"1|$c4"
testcase 'set -- "${s#????}"'			"1|"
testcase 'set -- "${s#*$c3}"'			"1|$c4"
testcase 'set -- "${s%$c4}"'			"1|$c1$c2$c3"
testcase 'set -- "${s%$c3$c4}"'			"1|$c1$c2"
testcase 'set -- "${s%$c2$c3$c4}"'		"1|$c1"
testcase 'set -- "${s%$c1$c2$c3$c4}"'		"1|"
testcase 'set -- "${s%?}"'			"1|$c1$c2$c3"
testcase 'set -- "${s%??}"'			"1|$c1$c2"
testcase 'set -- "${s%???}"'			"1|$c1"
testcase 'set -- "${s%????}"'			"1|"
testcase 'set -- "${s%$c2*}"'			"1|$c1"
testcase 'set -- "${s##$c2}"'			"1|$s"
testcase 'set -- "${s##*}"'			"1|"
testcase 'set -- "${s##$c1}"'			"1|$c2$c3$c4"
testcase 'set -- "${s##$c1$c2}"'		"1|$c3$c4"
testcase 'set -- "${s##$c1$c2$c3}"'		"1|$c4"
testcase 'set -- "${s##$c1$c2$c3$c4}"'		"1|"
testcase 'set -- "${s##?}"'			"1|$c2$c3$c4"
testcase 'set -- "${s##??}"'			"1|$c3$c4"
testcase 'set -- "${s##???}"'			"1|$c4"
testcase 'set -- "${s##????}"'			"1|"
testcase 'set -- "${s##*$c3}"'			"1|$c4"
testcase 'set -- "${s%%$c4}"'			"1|$c1$c2$c3"
testcase 'set -- "${s%%$c3$c4}"'		"1|$c1$c2"
testcase 'set -- "${s%%$c2$c3$c4}"'		"1|$c1"
testcase 'set -- "${s%%$c1$c2$c3$c4}"'		"1|"
testcase 'set -- "${s%%?}"'			"1|$c1$c2$c3"
testcase 'set -- "${s%%??}"'			"1|$c1$c2"
testcase 'set -- "${s%%???}"'			"1|$c1"
testcase 'set -- "${s%%????}"'			"1|"
testcase 'set -- "${s%%$c2*}"'			"1|$c1"

test "x$failures" = x