// SPDX-License-Identifier: BSD-3-Clause

// Code in this file was copied from `go/src/os/path.go`
// and `go/src/os/path_unix.go`.

// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the `go.LICENSE` file.

//go:build unix

package ufs

import (
	"os"
)

// basename removes trailing slashes and the leading directory name from path name.
func basename(name string) string {
	i := len(name) - 1
	// Remove trailing slashes
	for ; i > 0 && name[i] == '/'; i-- {
		name = name[:i]
	}
	// Remove leading directory name
	for i--; i >= 0; i-- {
		if name[i] == '/' {
			name = name[i+1:]
			break
		}
	}
	return name
}

// endsWithDot reports whether the final component of path is ".".
func endsWithDot(path string) bool {
	if path == "." {
		return true
	}
	if len(path) >= 2 && path[len(path)-1] == '.' && os.IsPathSeparator(path[len(path)-2]) {
		return true
	}
	return false
}

// splitPath returns the base name and parent directory.
func splitPath(path string) (string, string) {
	// if no better parent is found, the path is relative from "here"
	dirname := "."

	// Remove all but one leading slash.
	for len(path) > 1 && path[0] == '/' && path[1] == '/' {
		path = path[1:]
	}

	i := len(path) - 1

	// Remove trailing slashes.
	for ; i > 0 && path[i] == '/'; i-- {
		path = path[:i]
	}

	// if no slashes in path, base is path
	basename := path

	// Remove leading directory path
	for i--; i >= 0; i-- {
		if path[i] == '/' {
			if i == 0 {
				dirname = path[:1]
			} else {
				dirname = path[:i]
			}
			basename = path[i+1:]
			break
		}
	}

	return dirname, basename
}