// godlighty -- highly-customizable HTTP, HTTP/2, HTTPS server
// Copyright (C) 2021-2025 Sergey Matveev <stargrave@stargrave.org>
//
// 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, version 3 of the License.
//
// 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/>.

// Copy-pasted private function from native Go libraries.

package godlighty

import (
	"slices"
	"strings"
)

func containsDotDot(v string) bool {
	if !strings.Contains(v, "..") {
		return false
	}
	return slices.Contains(strings.FieldsFunc(v, isSlashRune), "..")
}

func isSlashRune(r rune) bool { return r == '/' || r == '\\' }