diff --git a/src/cmd/ebnflint/ebnflint.go b/src/cmd/ebnflint/ebnflint.go
index 5eb3987..cac3917 100644
--- a/src/cmd/ebnflint/ebnflint.go
+++ b/src/cmd/ebnflint/ebnflint.go
@@ -13,7 +13,7 @@
 	"go/token"
 	"io/ioutil"
 	"os"
-	"path"
+	"path/filepath"
 )
 
 
@@ -91,7 +91,7 @@
 		os.Exit(1)
 	}
 
-	if path.Ext(filename) == ".html" {
+	if filepath.Ext(filename) == ".html" {
 		src = extractEBNF(src)
 	}
 
diff --git a/src/cmd/godoc/dirtrees.go b/src/cmd/godoc/dirtrees.go
index d6d88c2..3ad7c8c 100644
--- a/src/cmd/godoc/dirtrees.go
+++ b/src/cmd/godoc/dirtrees.go
@@ -14,7 +14,7 @@
 	"io/ioutil"
 	"log"
 	"os"
-	pathutil "path"
+	"path/filepath"
 	"strings"
 	"unicode"
 )
@@ -32,7 +32,7 @@
 func isGoFile(f *os.FileInfo) bool {
 	return f.IsRegular() &&
 		!strings.HasPrefix(f.Name, ".") && // ignore .files
-		pathutil.Ext(f.Name) == ".go"
+		filepath.Ext(f.Name) == ".go"
 }
 
 
@@ -123,7 +123,7 @@
 			// though the directory doesn't contain any real package files - was bug)
 			if synopses[0] == "" {
 				// no "optimal" package synopsis yet; continue to collect synopses
-				file, err := parser.ParseFile(fset, pathutil.Join(path, d.Name), nil,
+				file, err := parser.ParseFile(fset, filepath.Join(path, d.Name), nil,
 					parser.ParseComments|parser.PackageClauseOnly)
 				if err == nil {
 					hasPkgFiles = true
@@ -156,7 +156,7 @@
 		i := 0
 		for _, d := range list {
 			if isPkgDir(d) {
-				dd := b.newDirTree(fset, pathutil.Join(path, d.Name), d.Name, depth+1)
+				dd := b.newDirTree(fset, filepath.Join(path, d.Name), d.Name, depth+1)
 				if dd != nil {
 					dirs[i] = dd
 					i++
diff --git a/src/cmd/godoc/godoc.go b/src/cmd/godoc/godoc.go
index efb386f..9dce5ed 100644
--- a/src/cmd/godoc/godoc.go
+++ b/src/cmd/godoc/godoc.go
@@ -18,7 +18,8 @@
 	"io/ioutil"
 	"log"
 	"os"
-	pathutil "path"
+	"path"
+	"path/filepath"
 	"regexp"
 	"runtime"
 	"sort"
@@ -81,8 +82,8 @@
 func initHandlers() {
 	fsMap.Init(*pkgPath)
 	fileServer = http.FileServer(*goroot, "")
-	cmdHandler = httpHandler{"/cmd/", pathutil.Join(*goroot, "src/cmd"), false}
-	pkgHandler = httpHandler{"/pkg/", pathutil.Join(*goroot, "src/pkg"), true}
+	cmdHandler = httpHandler{"/cmd/", filepath.Join(*goroot, "src", "cmd"), false}
+	pkgHandler = httpHandler{"/pkg/", filepath.Join(*goroot, "src", "pkg"), true}
 }
 
 
@@ -97,7 +98,7 @@
 
 
 func initFSTree() {
-	fsTree.set(newDirectory(pathutil.Join(*goroot, *testDir), nil, -1))
+	fsTree.set(newDirectory(filepath.Join(*goroot, *testDir), nil, -1))
 	invalidateIndex()
 }
 
@@ -246,27 +247,30 @@
 // ----------------------------------------------------------------------------
 // Path mapping
 
-func absolutePath(path, defaultRoot string) string {
-	abspath := fsMap.ToAbsolute(path)
+// Absolute paths are file system paths (backslash-separated on Windows),
+// but relative paths are always slash-separated.
+
+func absolutePath(relpath, defaultRoot string) string {
+	abspath := fsMap.ToAbsolute(relpath)
 	if abspath == "" {
 		// no user-defined mapping found; use default mapping
-		abspath = pathutil.Join(defaultRoot, path)
+		abspath = filepath.Join(defaultRoot, filepath.FromSlash(relpath))
 	}
 	return abspath
 }
 
 
-func relativePath(path string) string {
-	relpath := fsMap.ToRelative(path)
+func relativeURL(abspath string) string {
+	relpath := fsMap.ToRelative(abspath)
 	if relpath == "" {
-		// prefix must end in '/'
+		// prefix must end in a path separator
 		prefix := *goroot
-		if len(prefix) > 0 && prefix[len(prefix)-1] != '/' {
-			prefix += "/"
+		if len(prefix) > 0 && prefix[len(prefix)-1] != filepath.Separator {
+			prefix += string(filepath.Separator)
 		}
-		if strings.HasPrefix(path, prefix) {
+		if strings.HasPrefix(abspath, prefix) {
 			// no user-defined mapping found; use default mapping
-			relpath = path[len(prefix):]
+			relpath = filepath.ToSlash(abspath[len(prefix):])
 		}
 	}
 	// Only if path is an invalid absolute path is relpath == ""
@@ -481,7 +485,7 @@
 	}
 
 	// map path
-	relpath := relativePath(path)
+	relpath := relativeURL(path)
 
 	// convert to relative URLs so that they can also
 	// be used as relative file names in .txt templates
@@ -598,7 +602,7 @@
 
 // Template formatter for "localname" format.
 func localnameFmt(w io.Writer, format string, x ...interface{}) {
-	_, localname := pathutil.Split(x[0].(string))
+	_, localname := filepath.Split(x[0].(string))
 	template.HTMLEscape(w, []byte(localname))
 }
 
@@ -630,7 +634,7 @@
 
 
 func readTemplate(name string) *template.Template {
-	path := pathutil.Join(*goroot, "lib/godoc/"+name)
+	path := filepath.Join(*goroot, "lib", "godoc", name)
 	data, err := ioutil.ReadFile(path)
 	if err != nil {
 		log.Fatalf("ReadFile %s: %v", path, err)
@@ -767,14 +771,13 @@
 
 
 func redirect(w http.ResponseWriter, r *http.Request) (redirected bool) {
-	if canonical := pathutil.Clean(r.URL.Path) + "/"; r.URL.Path != canonical {
+	if canonical := path.Clean(r.URL.Path) + "/"; r.URL.Path != canonical {
 		http.Redirect(w, r, canonical, http.StatusMovedPermanently)
 		redirected = true
 	}
 	return
 }
 
-
 func serveTextFile(w http.ResponseWriter, r *http.Request, abspath, relpath, title string) {
 	src, err := ioutil.ReadFile(abspath)
 	if err != nil {
@@ -785,7 +788,7 @@
 
 	var buf bytes.Buffer
 	buf.WriteString("<pre>")
-	FormatText(&buf, src, 1, pathutil.Ext(abspath) == ".go", r.FormValue("h"), rangeSelection(r.FormValue("s")))
+	FormatText(&buf, src, 1, filepath.Ext(abspath) == ".go", r.FormValue("h"), rangeSelection(r.FormValue("s")))
 	buf.WriteString("</pre>")
 
 	servePage(w, title+" "+relpath, "", "", buf.Bytes())
@@ -822,7 +825,7 @@
 	// pick off special cases and hand the rest to the standard file server
 	switch r.URL.Path {
 	case "/":
-		serveHTMLDoc(w, r, pathutil.Join(*goroot, "doc/root.html"), "doc/root.html")
+		serveHTMLDoc(w, r, filepath.Join(*goroot, "doc", "root.html"), "doc/root.html")
 		return
 
 	case "/doc/root.html":
@@ -831,9 +834,9 @@
 		return
 	}
 
-	switch pathutil.Ext(abspath) {
+	switch path.Ext(relpath) {
 	case ".html":
-		if strings.HasSuffix(abspath, "/index.html") {
+		if strings.HasSuffix(relpath, "/index.html") {
 			// We'll show index.html for the directory.
 			// Use the dir/ version as canonical instead of dir/index.html.
 			http.Redirect(w, r, r.URL.Path[0:len(r.URL.Path)-len("index.html")], http.StatusMovedPermanently)
@@ -858,8 +861,8 @@
 		if redirect(w, r) {
 			return
 		}
-		if index := abspath + "/index.html"; isTextFile(index) {
-			serveHTMLDoc(w, r, index, relativePath(index))
+		if index := filepath.Join(abspath, "index.html"); isTextFile(index) {
+			serveHTMLDoc(w, r, index, relativeURL(index))
 			return
 		}
 		serveDirectory(w, r, abspath, relpath)
@@ -955,13 +958,13 @@
 		// the package with dirname, and the 3rd choice is a package
 		// that is not called "main" if there is exactly one such
 		// package. Otherwise, don't select a package.
-		dirpath, dirname := pathutil.Split(abspath)
+		dirpath, dirname := filepath.Split(abspath)
 
 		// If the dirname is "go" we might be in a sub-directory for
 		// .go files - use the outer directory name instead for better
 		// results.
 		if dirname == "go" {
-			_, dirname = pathutil.Split(pathutil.Clean(dirpath))
+			_, dirname = filepath.Split(filepath.Clean(dirpath))
 		}
 
 		var choice3 *ast.Package
@@ -1002,7 +1005,7 @@
 			ast.PackageExports(pkg)
 		}
 		if mode&genDoc != 0 {
-			pdoc = doc.NewPackageDoc(pkg, pathutil.Clean(relpath)) // no trailing '/' in importpath
+			pdoc = doc.NewPackageDoc(pkg, path.Clean(relpath)) // no trailing '/' in importpath
 		} else {
 			past = ast.MergePackageFiles(pkg, ast.FilterUnassociatedComments)
 		}
@@ -1088,13 +1091,13 @@
 			title = "Package " + info.PDoc.PackageName
 		case info.PDoc.PackageName == fakePkgName:
 			// assume that the directory name is the command name
-			_, pkgname := pathutil.Split(pathutil.Clean(relpath))
+			_, pkgname := path.Split(path.Clean(relpath))
 			title = "Command " + pkgname
 		default:
 			title = "Command " + info.PDoc.PackageName
 		}
 	default:
-		title = "Directory " + relativePath(info.Dirname)
+		title = "Directory " + relativeURL(info.Dirname)
 		if *showTimestamps {
 			subtitle = "Last update: " + time.SecondsToLocalTime(info.DirTime).String()
 		}
diff --git a/src/cmd/godoc/index.go b/src/cmd/godoc/index.go
index 56f31f5..5af4d15 100644
--- a/src/cmd/godoc/index.go
+++ b/src/cmd/godoc/index.go
@@ -47,7 +47,7 @@
 	"index/suffixarray"
 	"io/ioutil"
 	"os"
-	"path"
+	"path/filepath"
 	"regexp"
 	"sort"
 	"strings"
@@ -718,7 +718,7 @@
 // of "permitted" files for indexing. The filename must
 // be the directory-local name of the file.
 func isWhitelisted(filename string) bool {
-	key := path.Ext(filename)
+	key := filepath.Ext(filename)
 	if key == "" {
 		// file has no extension - use entire filename
 		key = filename
@@ -732,7 +732,7 @@
 		return
 	}
 
-	filename := path.Join(dirname, f.Name)
+	filename := filepath.Join(dirname, f.Name)
 	goFile := false
 
 	switch {
@@ -757,7 +757,7 @@
 	if fast != nil {
 		// we've got a Go file to index
 		x.current = file
-		dir, _ := path.Split(filename)
+		dir, _ := filepath.Split(filename)
 		pak := Pak{dir, fast.Name.Name}
 		x.file = &File{filename, pak}
 		ast.Walk(x, fast)
diff --git a/src/cmd/godoc/main.go b/src/cmd/godoc/main.go
index ea1e3c4..1ebb802 100644
--- a/src/cmd/godoc/main.go
+++ b/src/cmd/godoc/main.go
@@ -36,7 +36,7 @@
 	"io"
 	"log"
 	"os"
-	pathutil "path"
+	"path/filepath"
 	"regexp"
 	"runtime"
 	"strings"
@@ -314,14 +314,14 @@
 	if len(path) > 0 && path[0] == '.' {
 		// assume cwd; don't assume -goroot
 		cwd, _ := os.Getwd() // ignore errors
-		path = pathutil.Join(cwd, path)
+		path = filepath.Join(cwd, path)
 	}
 	relpath := path
 	abspath := path
-	if !pathutil.IsAbs(path) {
+	if !filepath.IsAbs(path) {
 		abspath = absolutePath(path, pkgHandler.fsRoot)
 	} else {
-		relpath = relativePath(path)
+		relpath = relativeURL(path)
 	}
 
 	var mode PageInfoMode
@@ -339,7 +339,7 @@
 
 	if info.IsEmpty() {
 		// try again, this time assume it's a command
-		if !pathutil.IsAbs(path) {
+		if !filepath.IsAbs(path) {
 			abspath = absolutePath(path, cmdHandler.fsRoot)
 		}
 		cmdInfo := cmdHandler.getPageInfo(abspath, relpath, "", mode)
diff --git a/src/cmd/godoc/mapping.go b/src/cmd/godoc/mapping.go
index 1d87bbc..6ae9032 100644
--- a/src/cmd/godoc/mapping.go
+++ b/src/cmd/godoc/mapping.go
@@ -10,7 +10,8 @@
 	"fmt"
 	"io"
 	"os"
-	pathutil "path"
+	"path"
+	"path/filepath"
 	"sort"
 	"strings"
 )
@@ -59,10 +60,10 @@
 }
 
 
-// Init initializes the Mapping from a list of ':'-separated
-// paths. Empty paths are ignored; relative paths are assumed
-// to be relative to the current working directory and converted
-// to absolute paths. For each path of the form:
+// Init initializes the Mapping from a list of paths separated by
+// filepath.ListSeparator. Empty paths are ignored; relative paths
+// are assumed to be relative to the current working directory and
+// converted to absolute paths. For each path of the form:
 //
 //	dirname/localname
 //
@@ -71,7 +72,7 @@
 //	localname -> path
 //
 // is added to the Mapping object, in the order of occurrence.
-// For instance, the argument:
+// For instance, under Unix, the argument:
 //
 //	/home/user:/home/build/public
 //
@@ -81,12 +82,12 @@
 //	public -> /home/build/public
 //
 func (m *Mapping) Init(paths string) {
-	pathlist := canonicalizePaths(strings.Split(paths, ":", -1), nil)
+	pathlist := canonicalizePaths(filepath.SplitList(paths), nil)
 	list := make([]mapping, len(pathlist))
 
 	// create mapping list
 	for i, path := range pathlist {
-		_, prefix := pathutil.Split(path)
+		_, prefix := filepath.Split(path)
 		list[i] = mapping{prefix, path, new(RWValue)}
 	}
 
@@ -147,7 +148,7 @@
 
 
 func splitFirst(path string) (head, tail string) {
-	i := strings.Index(path, "/")
+	i := strings.Index(path, string(filepath.Separator))
 	if i > 0 {
 		// 0 < i < len(path)
 		return path[0:i], path[i+1:]
@@ -156,22 +157,23 @@
 }
 
 
-// ToAbsolute maps a relative path to an absolute path using the Mapping
-// specified by the receiver. If the path cannot be mapped, the empty
-// string is returned.
+// ToAbsolute maps a slash-separated relative path to an absolute filesystem
+// path using the Mapping specified by the receiver. If the path cannot
+// be mapped, the empty string is returned.
 //
-func (m *Mapping) ToAbsolute(path string) string {
-	prefix, tail := splitFirst(path)
+func (m *Mapping) ToAbsolute(spath string) string {
+	fpath := filepath.FromSlash(spath)
+	prefix, tail := splitFirst(fpath)
 	for _, e := range m.list {
 		switch {
 		case e.prefix == prefix:
 			// use tail
 		case e.prefix == "":
-			tail = path
+			tail = fpath
 		default:
 			continue // no match
 		}
-		abspath := pathutil.Join(e.path, tail)
+		abspath := filepath.Join(e.path, tail)
 		if _, err := os.Stat(abspath); err == nil {
 			return abspath
 		}
@@ -181,15 +183,16 @@
 }
 
 
-// ToRelative maps an absolute path to a relative path using the Mapping
-// specified by the receiver. If the path cannot be mapped, the empty
-// string is returned.
+// ToRelative maps an absolute filesystem path to a relative slash-separated
+// path using the Mapping specified by the receiver. If the path cannot
+// be mapped, the empty string is returned.
 //
-func (m *Mapping) ToRelative(path string) string {
+func (m *Mapping) ToRelative(fpath string) string {
 	for _, e := range m.list {
-		if strings.HasPrefix(path, e.path) {
+		if strings.HasPrefix(fpath, e.path) {
+			spath := filepath.ToSlash(fpath)
 			// /absolute/prefix/foo -> prefix/foo
-			return pathutil.Join(e.prefix, path[len(e.path):]) // Join will remove a trailing '/'
+			return path.Join(e.prefix, spath[len(e.path):]) // Join will remove a trailing '/'
 		}
 	}
 	return "" // no match
diff --git a/src/cmd/godoc/utils.go b/src/cmd/godoc/utils.go
index d21e7e9..9517aee 100644
--- a/src/cmd/godoc/utils.go
+++ b/src/cmd/godoc/utils.go
@@ -10,7 +10,7 @@
 	"io"
 	"io/ioutil"
 	"os"
-	pathutil "path"
+	"path/filepath"
 	"sort"
 	"strings"
 	"sync"
@@ -60,10 +60,10 @@
 			continue // ignore empty paths (don't assume ".")
 		}
 		// len(path) > 0: normalize path
-		if pathutil.IsAbs(path) {
-			path = pathutil.Clean(path)
+		if filepath.IsAbs(path) {
+			path = filepath.Clean(path)
 		} else {
-			path = pathutil.Join(cwd, path)
+			path = filepath.Join(cwd, path)
 		}
 		// we have a non-empty absolute path
 		if filter != nil && !filter(path) {
@@ -95,7 +95,7 @@
 // atomically renames that file to the file named by filename.
 //
 func writeFileAtomically(filename string, data []byte) os.Error {
-	f, err := ioutil.TempFile(pathutil.Split(filename))
+	f, err := ioutil.TempFile(filepath.Split(filename))
 	if err != nil {
 		return err
 	}
@@ -149,7 +149,7 @@
 //
 func isTextFile(filename string) bool {
 	// if the extension is known, use it for decision making
-	if isText, found := textExt[pathutil.Ext(filename)]; found {
+	if isText, found := textExt[filepath.Ext(filename)]; found {
 		return isText
 	}
 
diff --git a/src/cmd/gofmt/gofmt.go b/src/cmd/gofmt/gofmt.go
index 41c12b8..224aee7 100644
--- a/src/cmd/gofmt/gofmt.go
+++ b/src/cmd/gofmt/gofmt.go
@@ -15,7 +15,7 @@
 	"go/token"
 	"io/ioutil"
 	"os"
-	pathutil "path"
+	"path/filepath"
 	"strings"
 )
 
@@ -181,7 +181,7 @@
 		done <- true
 	}()
 	// walk the tree
-	pathutil.Walk(path, v, v)
+	filepath.Walk(path, v, v)
 	close(v) // terminate error handler loop
 	<-done   // wait for all errors to be reported
 }
diff --git a/src/cmd/goinstall/download.go b/src/cmd/goinstall/download.go
index 889f9d8..88befc0 100644
--- a/src/cmd/goinstall/download.go
+++ b/src/cmd/goinstall/download.go
@@ -9,7 +9,7 @@
 import (
 	"http"
 	"os"
-	"path"
+	"path/filepath"
 	"regexp"
 	"strings"
 )
@@ -42,7 +42,7 @@
 		return "", os.ErrorString("invalid path (contains ..)")
 	}
 	if m := bitbucket.FindStringSubmatch(pkg); m != nil {
-		if err := vcsCheckout(&hg, root+m[1], "http://"+m[1], m[1]); err != nil {
+		if err := vcsCheckout(&hg, m[1], "http://"+m[1], m[1]); err != nil {
 			return "", err
 		}
 		return root + pkg, nil
@@ -58,7 +58,7 @@
 			// regexp only allows hg, svn to get through
 			panic("missing case in download: " + pkg)
 		}
-		if err := vcsCheckout(v, root+m[1], "https://"+m[1], m[1]); err != nil {
+		if err := vcsCheckout(v, m[1], "https://"+m[1], m[1]); err != nil {
 			return "", err
 		}
 		return root + pkg, nil
@@ -67,7 +67,7 @@
 		if strings.HasSuffix(m[1], ".git") {
 			return "", os.ErrorString("repository " + pkg + " should not have .git suffix")
 		}
-		if err := vcsCheckout(&git, root+m[1], "http://"+m[1]+".git", m[1]); err != nil {
+		if err := vcsCheckout(&git, m[1], "http://"+m[1]+".git", m[1]); err != nil {
 			return "", err
 		}
 		return root + pkg, nil
@@ -75,7 +75,7 @@
 	if m := launchpad.FindStringSubmatch(pkg); m != nil {
 		// Either lp.net/<project>[/<series>[/<path>]]
 		//	 or lp.net/~<user or team>/<project>/<branch>[/<path>]
-		if err := vcsCheckout(&bzr, root+m[1], "https://"+m[1], m[1]); err != nil {
+		if err := vcsCheckout(&bzr, m[1], "https://"+m[1], m[1]); err != nil {
 			return "", err
 		}
 		return root + pkg, nil
@@ -172,17 +172,18 @@
 // exists and -u was specified on the command line)
 // the repository at tag/branch "release".  If there is no
 // such tag or branch, it falls back to the repository tip.
-func vcsCheckout(vcs *vcs, dst, repo, dashpath string) os.Error {
-	dir, err := os.Stat(dst + "/" + vcs.metadir)
+func vcsCheckout(vcs *vcs, pkgprefix, repo, dashpath string) os.Error {
+	dst := filepath.Join(root, filepath.FromSlash(pkgprefix))
+	dir, err := os.Stat(filepath.Join(dst, vcs.metadir))
 	if err == nil && !dir.IsDirectory() {
 		return os.ErrorString("not a directory: " + dst)
 	}
 	if err != nil {
-		parent, _ := path.Split(dst)
+		parent, _ := filepath.Split(dst)
 		if err := os.MkdirAll(parent, 0777); err != nil {
 			return err
 		}
-		if err := run("/", nil, vcs.cmd, vcs.clone, repo, dst); err != nil {
+		if err := run(string(filepath.Separator), nil, vcs.cmd, vcs.clone, repo, dst); err != nil {
 			return err
 		}
 		if err := vcs.updateRepo(dst); err != nil {
diff --git a/src/cmd/goinstall/main.go b/src/cmd/goinstall/main.go
index f13aeb3..34441be 100644
--- a/src/cmd/goinstall/main.go
+++ b/src/cmd/goinstall/main.go
@@ -15,7 +15,7 @@
 	"io"
 	"io/ioutil"
 	"os"
-	"path"
+	"path/filepath"
 	"runtime"
 	"strings"
 )
@@ -34,7 +34,7 @@
 	parents       = make(map[string]string)
 	root          = runtime.GOROOT()
 	visit         = make(map[string]status)
-	logfile       = path.Join(root, "goinstall.log")
+	logfile       = filepath.Join(root, "goinstall.log")
 	installedPkgs = make(map[string]bool)
 
 	allpkg            = flag.Bool("a", false, "install all previously installed packages")
@@ -59,7 +59,7 @@
 		fmt.Fprintf(os.Stderr, "%s: no $GOROOT\n", argv0)
 		os.Exit(1)
 	}
-	root += "/src/pkg/"
+	root += filepath.FromSlash("/src/pkg/")
 
 	// special case - "unsafe" is already installed
 	visit["unsafe"] = done
@@ -160,7 +160,7 @@
 		dir = pkg
 		local = true
 	} else if isStandardPath(pkg) {
-		dir = path.Join(root, pkg)
+		dir = filepath.Join(root, filepath.FromSlash(pkg))
 		local = true
 	} else {
 		var err os.Error
@@ -216,7 +216,8 @@
 
 // Is this a local path?  /foo ./foo ../foo . ..
 func isLocalPath(s string) bool {
-	return strings.HasPrefix(s, "/") || strings.HasPrefix(s, "./") || strings.HasPrefix(s, "../") || s == "." || s == ".."
+	const sep = string(filepath.Separator)
+	return strings.HasPrefix(s, sep) || strings.HasPrefix(s, "."+sep) || strings.HasPrefix(s, ".."+sep) || s == "." || s == ".."
 }
 
 // Is this a standard package path?  strings container/vector etc.
diff --git a/src/cmd/goinstall/parse.go b/src/cmd/goinstall/parse.go
index 679edfa..014b8fc 100644
--- a/src/cmd/goinstall/parse.go
+++ b/src/cmd/goinstall/parse.go
@@ -7,13 +7,13 @@
 package main
 
 import (
-	"path"
-	"os"
-	"log"
-	"strings"
-	"strconv"
 	"go/ast"
 	"go/parser"
+	"log"
+	"os"
+	"path/filepath"
+	"strconv"
+	"strings"
 )
 
 
@@ -64,7 +64,7 @@
 		if !strings.HasSuffix(d.Name, ".go") || strings.HasSuffix(d.Name, "_test.go") {
 			continue
 		}
-		filename := path.Join(dir, d.Name)
+		filename := filepath.Join(dir, d.Name)
 		pf, err := parser.ParseFile(fset, filename, nil, parser.ImportsOnly)
 		if err != nil {
 			return nil, err
diff --git a/src/cmd/govet/govet.go b/src/cmd/govet/govet.go
index 5619b12..ff6421d 100644
--- a/src/cmd/govet/govet.go
+++ b/src/cmd/govet/govet.go
@@ -15,7 +15,7 @@
 	"go/parser"
 	"go/token"
 	"os"
-	"path"
+	"path/filepath"
 	"strconv"
 	"strings"
 )
@@ -99,7 +99,7 @@
 	file.checkFile(name, parsedFile)
 }
 
-// Visitor for path.Walk - trivial.  Just calls doFile on each file.
+// Visitor for filepath.Walk - trivial.  Just calls doFile on each file.
 // TODO: if govet becomes richer, might want to process
 // a directory (package) at a time.
 type V struct{}
@@ -124,7 +124,7 @@
 		}
 		done <- true
 	}()
-	path.Walk(root, V{}, errors)
+	filepath.Walk(root, V{}, errors)
 	close(errors)
 	<-done
 }
diff --git a/src/cmd/hgpatch/main.go b/src/cmd/hgpatch/main.go
index bd4b563..2dcb523 100644
--- a/src/cmd/hgpatch/main.go
+++ b/src/cmd/hgpatch/main.go
@@ -14,7 +14,7 @@
 	"io/ioutil"
 	"os"
 	"patch"
-	"path"
+	"path/filepath"
 	"sort"
 	"strings"
 )
@@ -186,7 +186,7 @@
 
 // make parent directory for name, if necessary
 func makeParent(name string) {
-	parent, _ := path.Split(name)
+	parent, _ := filepath.Split(name)
 	chk(mkdirAll(parent, 0755))
 }
 
diff --git a/src/pkg/Makefile b/src/pkg/Makefile
index 331bb68..6e70690 100644
--- a/src/pkg/Makefile
+++ b/src/pkg/Makefile
@@ -118,6 +118,7 @@
 	os/signal\
 	patch\
 	path\
+	path/filepath\
 	rand\
 	reflect\
 	regexp\
diff --git a/src/pkg/go/parser/interface.go b/src/pkg/go/parser/interface.go
index 84d699a..6f35b49 100644
--- a/src/pkg/go/parser/interface.go
+++ b/src/pkg/go/parser/interface.go
@@ -14,7 +14,7 @@
 	"io"
 	"io/ioutil"
 	"os"
-	pathutil "path"
+	"path/filepath"
 )
 
 
@@ -198,7 +198,7 @@
 	for i := 0; i < len(list); i++ {
 		d := &list[i]
 		if filter == nil || filter(d) {
-			filenames[n] = pathutil.Join(path, d.Name)
+			filenames[n] = filepath.Join(path, d.Name)
 			n++
 		}
 	}
diff --git a/src/pkg/go/printer/printer.go b/src/pkg/go/printer/printer.go
index 48e2af1..90d9784 100644
--- a/src/pkg/go/printer/printer.go
+++ b/src/pkg/go/printer/printer.go
@@ -12,7 +12,7 @@
 	"go/token"
 	"io"
 	"os"
-	"path"
+	"path/filepath"
 	"runtime"
 	"tabwriter"
 )
@@ -244,7 +244,7 @@
 	}
 	if debug {
 		// do not update p.pos - use write0
-		_, filename := path.Split(pos.Filename)
+		_, filename := filepath.Split(pos.Filename)
 		p.write0([]byte(fmt.Sprintf("[%s:%d:%d]", filename, pos.Line, pos.Column)))
 	}
 	p.write(data)
diff --git a/src/pkg/go/printer/printer_test.go b/src/pkg/go/printer/printer_test.go
index 565075a..62b7269 100644
--- a/src/pkg/go/printer/printer_test.go
+++ b/src/pkg/go/printer/printer_test.go
@@ -11,7 +11,7 @@
 	"go/ast"
 	"go/parser"
 	"go/token"
-	"path"
+	"path/filepath"
 	"testing"
 )
 
@@ -129,8 +129,8 @@
 
 func TestFiles(t *testing.T) {
 	for _, e := range data {
-		source := path.Join(dataDir, e.source)
-		golden := path.Join(dataDir, e.golden)
+		source := filepath.Join(dataDir, e.source)
+		golden := filepath.Join(dataDir, e.golden)
 		check(t, source, golden, e.mode)
 		// TODO(gri) check that golden is idempotent
 		//check(t, golden, golden, e.mode);
diff --git a/src/pkg/go/scanner/scanner.go b/src/pkg/go/scanner/scanner.go
index 2ae296b..153707f 100644
--- a/src/pkg/go/scanner/scanner.go
+++ b/src/pkg/go/scanner/scanner.go
@@ -23,7 +23,7 @@
 import (
 	"bytes"
 	"go/token"
-	"path"
+	"path/filepath"
 	"strconv"
 	"unicode"
 	"utf8"
@@ -118,7 +118,7 @@
 		panic("file size does not match src len")
 	}
 	S.file = file
-	S.dir, _ = path.Split(file.Name())
+	S.dir, _ = filepath.Split(file.Name())
 	S.src = src
 	S.err = err
 	S.mode = mode
@@ -180,10 +180,10 @@
 		if i := bytes.Index(text, []byte{':'}); i > 0 {
 			if line, err := strconv.Atoi(string(text[i+1:])); err == nil && line > 0 {
 				// valid //line filename:line comment;
-				filename := path.Clean(string(text[len(prefix):i]))
+				filename := filepath.Clean(string(text[len(prefix):i]))
 				if filename[0] != '/' {
 					// make filename relative to current directory
-					filename = path.Join(S.dir, filename)
+					filename = filepath.Join(S.dir, filename)
 				}
 				// update scanner position
 				S.file.AddLineInfo(S.lineOffset, filename, line-1) // -1 since comment applies to next line
diff --git a/src/pkg/http/fs.go b/src/pkg/http/fs.go
index 8e16992..a4cd707 100644
--- a/src/pkg/http/fs.go
+++ b/src/pkg/http/fs.go
@@ -11,7 +11,7 @@
 	"io"
 	"mime"
 	"os"
-	"path"
+	"path/filepath"
 	"strconv"
 	"strings"
 	"time"
@@ -112,7 +112,7 @@
 
 	// use contents of index.html for directory, if present
 	if d.IsDirectory() {
-		index := name + indexPage
+		index := name + filepath.FromSlash(indexPage)
 		ff, err := os.Open(index, os.O_RDONLY, 0)
 		if err == nil {
 			defer ff.Close()
@@ -135,7 +135,7 @@
 	code := StatusOK
 
 	// use extension to find content type.
-	ext := path.Ext(name)
+	ext := filepath.Ext(name)
 	if ctype := mime.TypeByExtension(ext); ctype != "" {
 		w.SetHeader("Content-Type", ctype)
 	} else {
@@ -202,7 +202,7 @@
 		return
 	}
 	path = path[len(f.prefix):]
-	serveFile(w, r, f.root+"/"+path, true)
+	serveFile(w, r, filepath.Join(f.root, filepath.FromSlash(path)), true)
 }
 
 // httpRange specifies the byte range to be sent to the client.
diff --git a/src/pkg/io/ioutil/tempfile.go b/src/pkg/io/ioutil/tempfile.go
index c7cc67b..62f8849 100644
--- a/src/pkg/io/ioutil/tempfile.go
+++ b/src/pkg/io/ioutil/tempfile.go
@@ -6,6 +6,7 @@
 
 import (
 	"os"
+	"path/filepath"
 	"strconv"
 )
 
@@ -46,8 +47,7 @@
 
 	nconflict := 0
 	for i := 0; i < 10000; i++ {
-		// TODO(rsc): use filepath.Join
-		name := dir + "/" + prefix + nextSuffix()
+		name := filepath.Join(dir, prefix+nextSuffix())
 		f, err = os.Open(name, os.O_RDWR|os.O_CREATE|os.O_EXCL, 0600)
 		if pe, ok := err.(*os.PathError); ok && pe.Error == os.EEXIST {
 			if nconflict++; nconflict > 10 {
@@ -74,8 +74,7 @@
 
 	nconflict := 0
 	for i := 0; i < 10000; i++ {
-		// TODO(rsc): use filepath.Join
-		try := dir + "/" + prefix + nextSuffix()
+		try := filepath.Join(dir, prefix+nextSuffix())
 		err = os.Mkdir(try, 0700)
 		if pe, ok := err.(*os.PathError); ok && pe.Error == os.EEXIST {
 			if nconflict++; nconflict > 10 {
diff --git a/src/pkg/path/Makefile b/src/pkg/path/Makefile
index 4371913..fc3e251 100644
--- a/src/pkg/path/Makefile
+++ b/src/pkg/path/Makefile
@@ -9,18 +9,6 @@
 	match.go\
 	path.go\
 
-GOFILES_freebsd=\
-	path_unix.go
-
-GOFILES_darwin=\
-	path_unix.go
-
-GOFILES_linux=\
-	path_unix.go
-
-GOFILES_windows=\
-	path_windows.go
-
 GOFILES+=$(GOFILES_$(GOOS))
 
 include ../../Make.pkg
diff --git a/src/pkg/path/filepath/Makefile b/src/pkg/path/filepath/Makefile
new file mode 100644
index 0000000..2330fc0
--- /dev/null
+++ b/src/pkg/path/filepath/Makefile
@@ -0,0 +1,26 @@
+# 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 LICENSE file.
+
+include ../../../Make.inc
+
+TARG=path/filepath
+GOFILES=\
+	match.go\
+	path.go\
+
+GOFILES_freebsd=\
+	path_unix.go
+
+GOFILES_darwin=\
+	path_unix.go
+
+GOFILES_linux=\
+	path_unix.go
+
+GOFILES_windows=\
+	path_unix.go
+
+GOFILES+=$(GOFILES_$(GOOS))
+
+include ../../../Make.pkg
diff --git a/src/pkg/path/filepath/match.go b/src/pkg/path/filepath/match.go
new file mode 100644
index 0000000..ad4053f
--- /dev/null
+++ b/src/pkg/path/filepath/match.go
@@ -0,0 +1,282 @@
+// Copyright 2010 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package filepath
+
+import (
+	"os"
+	"sort"
+	"strings"
+	"utf8"
+)
+
+var ErrBadPattern = os.NewError("syntax error in pattern")
+
+// Match returns true if name matches the shell file name pattern.
+// The pattern syntax is:
+//
+//	pattern:
+//		{ term }
+//	term:
+//		'*'         matches any sequence of non-Separator characters
+//		'?'         matches any single non-Separator character
+//		'[' [ '^' ] { character-range } ']'
+//		            character class (must be non-empty)
+//		c           matches character c (c != '*', '?', '\\', '[')
+//		'\\' c      matches character c
+//
+//	character-range:
+//		c           matches character c (c != '\\', '-', ']')
+//		'\\' c      matches character c
+//		lo '-' hi   matches character c for lo <= c <= hi
+//
+// Match requires pattern to match all of name, not just a substring.
+// The only possible error return is when pattern is malformed.
+//
+func Match(pattern, name string) (matched bool, err os.Error) {
+Pattern:
+	for len(pattern) > 0 {
+		var star bool
+		var chunk string
+		star, chunk, pattern = scanChunk(pattern)
+		if star && chunk == "" {
+			// Trailing * matches rest of string unless it has a /.
+			return strings.Index(name, string(Separator)) < 0, nil
+		}
+		// Look for match at current position.
+		t, ok, err := matchChunk(chunk, name)
+		// if we're the last chunk, make sure we've exhausted the name
+		// otherwise we'll give a false result even if we could still match
+		// using the star
+		if ok && (len(t) == 0 || len(pattern) > 0) {
+			name = t
+			continue
+		}
+		if err != nil {
+			return false, err
+		}
+		if star {
+			// Look for match skipping i+1 bytes.
+			// Cannot skip /.
+			for i := 0; i < len(name) && name[i] != Separator; i++ {
+				t, ok, err := matchChunk(chunk, name[i+1:])
+				if ok {
+					// if we're the last chunk, make sure we exhausted the name
+					if len(pattern) == 0 && len(t) > 0 {
+						continue
+					}
+					name = t
+					continue Pattern
+				}
+				if err != nil {
+					return false, err
+				}
+			}
+		}
+		return false, nil
+	}
+	return len(name) == 0, nil
+}
+
+// scanChunk gets the next segment of pattern, which is a non-star string
+// possibly preceded by a star.
+func scanChunk(pattern string) (star bool, chunk, rest string) {
+	for len(pattern) > 0 && pattern[0] == '*' {
+		pattern = pattern[1:]
+		star = true
+	}
+	inrange := false
+	var i int
+Scan:
+	for i = 0; i < len(pattern); i++ {
+		switch pattern[i] {
+		case '\\':
+			// error check handled in matchChunk: bad pattern.
+			if i+1 < len(pattern) {
+				i++
+			}
+		case '[':
+			inrange = true
+		case ']':
+			inrange = false
+		case '*':
+			if !inrange {
+				break Scan
+			}
+		}
+	}
+	return star, pattern[0:i], pattern[i:]
+}
+
+// matchChunk checks whether chunk matches the beginning of s.
+// If so, it returns the remainder of s (after the match).
+// Chunk is all single-character operators: literals, char classes, and ?.
+func matchChunk(chunk, s string) (rest string, ok bool, err os.Error) {
+	for len(chunk) > 0 {
+		if len(s) == 0 {
+			return
+		}
+		switch chunk[0] {
+		case '[':
+			// character class
+			r, n := utf8.DecodeRuneInString(s)
+			s = s[n:]
+			chunk = chunk[1:]
+			// possibly negated
+			notNegated := true
+			if len(chunk) > 0 && chunk[0] == '^' {
+				notNegated = false
+				chunk = chunk[1:]
+			}
+			// parse all ranges
+			match := false
+			nrange := 0
+			for {
+				if len(chunk) > 0 && chunk[0] == ']' && nrange > 0 {
+					chunk = chunk[1:]
+					break
+				}
+				var lo, hi int
+				if lo, chunk, err = getEsc(chunk); err != nil {
+					return
+				}
+				hi = lo
+				if chunk[0] == '-' {
+					if hi, chunk, err = getEsc(chunk[1:]); err != nil {
+						return
+					}
+				}
+				if lo <= r && r <= hi {
+					match = true
+				}
+				nrange++
+			}
+			if match != notNegated {
+				return
+			}
+
+		case '?':
+			if s[0] == Separator {
+				return
+			}
+			_, n := utf8.DecodeRuneInString(s)
+			s = s[n:]
+			chunk = chunk[1:]
+
+		case '\\':
+			chunk = chunk[1:]
+			if len(chunk) == 0 {
+				err = ErrBadPattern
+				return
+			}
+			fallthrough
+
+		default:
+			if chunk[0] != s[0] {
+				return
+			}
+			s = s[1:]
+			chunk = chunk[1:]
+		}
+	}
+	return s, true, nil
+}
+
+// getEsc gets a possibly-escaped character from chunk, for a character class.
+func getEsc(chunk string) (r int, nchunk string, err os.Error) {
+	if len(chunk) == 0 || chunk[0] == '-' || chunk[0] == ']' {
+		err = ErrBadPattern
+		return
+	}
+	if chunk[0] == '\\' {
+		chunk = chunk[1:]
+		if len(chunk) == 0 {
+			err = ErrBadPattern
+			return
+		}
+	}
+	r, n := utf8.DecodeRuneInString(chunk)
+	if r == utf8.RuneError && n == 1 {
+		err = ErrBadPattern
+	}
+	nchunk = chunk[n:]
+	if len(nchunk) == 0 {
+		err = ErrBadPattern
+	}
+	return
+}
+
+// Glob returns the names of all files matching pattern or nil
+// if there is no matching file. The syntax of patterns is the same
+// as in Match. The pattern may describe hierarchical names such as
+// /usr/*/bin/ed (assuming the Separator is '/').
+//
+func Glob(pattern string) (matches []string) {
+	if !hasMeta(pattern) {
+		if _, err := os.Stat(pattern); err == nil {
+			return []string{pattern}
+		}
+		return nil
+	}
+
+	dir, file := Split(pattern)
+	switch dir {
+	case "":
+		dir = "."
+	case string(Separator):
+		// nothing
+	default:
+		dir = dir[0 : len(dir)-1] // chop off trailing separator
+	}
+
+	if hasMeta(dir) {
+		for _, d := range Glob(dir) {
+			matches = glob(d, file, matches)
+		}
+	} else {
+		return glob(dir, file, nil)
+	}
+	return matches
+}
+
+// glob searches for files matching pattern in the directory dir
+// and appends them to matches.
+func glob(dir, pattern string, matches []string) []string {
+	fi, err := os.Stat(dir)
+	if err != nil {
+		return nil
+	}
+	if !fi.IsDirectory() {
+		return matches
+	}
+	d, err := os.Open(dir, os.O_RDONLY, 0666)
+	if err != nil {
+		return nil
+	}
+	defer d.Close()
+
+	names, err := d.Readdirnames(-1)
+	if err != nil {
+		return nil
+	}
+	sort.SortStrings(names)
+
+	for _, n := range names {
+		matched, err := Match(pattern, n)
+		if err != nil {
+			return matches
+		}
+		if matched {
+			matches = append(matches, Join(dir, n))
+		}
+	}
+	return matches
+}
+
+// hasMeta returns true if path contains any of the magic characters
+// recognized by Match.
+func hasMeta(path string) bool {
+	// TODO(niemeyer): Should other magic characters be added here?
+	return strings.IndexAny(path, "*?[") >= 0
+}
diff --git a/src/pkg/path/filepath/match_test.go b/src/pkg/path/filepath/match_test.go
new file mode 100644
index 0000000..ad0c90b
--- /dev/null
+++ b/src/pkg/path/filepath/match_test.go
@@ -0,0 +1,106 @@
+// 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 LICENSE file.
+
+package filepath_test
+
+import (
+	"os"
+	"path/filepath"
+	"testing"
+)
+
+type MatchTest struct {
+	pattern, s string
+	match      bool
+	err        os.Error
+}
+
+var matchTests = []MatchTest{
+	{"abc", "abc", true, nil},
+	{"*", "abc", true, nil},
+	{"*c", "abc", true, nil},
+	{"a*", "a", true, nil},
+	{"a*", "abc", true, nil},
+	{"a*", "ab/c", false, nil},
+	{"a*/b", "abc/b", true, nil},
+	{"a*/b", "a/c/b", false, nil},
+	{"a*b*c*d*e*/f", "axbxcxdxe/f", true, nil},
+	{"a*b*c*d*e*/f", "axbxcxdxexxx/f", true, nil},
+	{"a*b*c*d*e*/f", "axbxcxdxe/xxx/f", false, nil},
+	{"a*b*c*d*e*/f", "axbxcxdxexxx/fff", false, nil},
+	{"a*b?c*x", "abxbbxdbxebxczzx", true, nil},
+	{"a*b?c*x", "abxbbxdbxebxczzy", false, nil},
+	{"ab[c]", "abc", true, nil},
+	{"ab[b-d]", "abc", true, nil},
+	{"ab[e-g]", "abc", false, nil},
+	{"ab[^c]", "abc", false, nil},
+	{"ab[^b-d]", "abc", false, nil},
+	{"ab[^e-g]", "abc", true, nil},
+	{"a\\*b", "a*b", true, nil},
+	{"a\\*b", "ab", false, nil},
+	{"a?b", "a☺b", true, nil},
+	{"a[^a]b", "a☺b", true, nil},
+	{"a???b", "a☺b", false, nil},
+	{"a[^a][^a][^a]b", "a☺b", false, nil},
+	{"[a-ζ]*", "α", true, nil},
+	{"*[a-ζ]", "A", false, nil},
+	{"a?b", "a/b", false, nil},
+	{"a*b", "a/b", false, nil},
+	{"[\\]a]", "]", true, nil},
+	{"[\\-]", "-", true, nil},
+	{"[x\\-]", "x", true, nil},
+	{"[x\\-]", "-", true, nil},
+	{"[x\\-]", "z", false, nil},
+	{"[\\-x]", "x", true, nil},
+	{"[\\-x]", "-", true, nil},
+	{"[\\-x]", "a", false, nil},
+	{"[]a]", "]", false, filepath.ErrBadPattern},
+	{"[-]", "-", false, filepath.ErrBadPattern},
+	{"[x-]", "x", false, filepath.ErrBadPattern},
+	{"[x-]", "-", false, filepath.ErrBadPattern},
+	{"[x-]", "z", false, filepath.ErrBadPattern},
+	{"[-x]", "x", false, filepath.ErrBadPattern},
+	{"[-x]", "-", false, filepath.ErrBadPattern},
+	{"[-x]", "a", false, filepath.ErrBadPattern},
+	{"\\", "a", false, filepath.ErrBadPattern},
+	{"[a-b-c]", "a", false, filepath.ErrBadPattern},
+	{"*x", "xxx", true, nil},
+}
+
+func TestMatch(t *testing.T) {
+	for _, tt := range matchTests {
+		ok, err := filepath.Match(tt.pattern, tt.s)
+		if ok != tt.match || err != tt.err {
+			t.Errorf("Match(%#q, %#q) = %v, %v want %v, nil", tt.pattern, tt.s, ok, err, tt.match)
+		}
+	}
+}
+
+// contains returns true if vector contains the string s.
+func contains(vector []string, s string) bool {
+	for _, elem := range vector {
+		if elem == s {
+			return true
+		}
+	}
+	return false
+}
+
+var globTests = []struct {
+	pattern, result string
+}{
+	{"match.go", "match.go"},
+	{"mat?h.go", "match.go"},
+	{"*", "match.go"},
+	{"../*/match.go", "../filepath/match.go"},
+}
+
+func TestGlob(t *testing.T) {
+	for _, tt := range globTests {
+		matches := filepath.Glob(tt.pattern)
+		if !contains(matches, tt.result) {
+			t.Errorf("Glob(%#q) = %#v want %v", tt.pattern, matches, tt.result)
+		}
+	}
+}
diff --git a/src/pkg/path/filepath/path.go b/src/pkg/path/filepath/path.go
new file mode 100644
index 0000000..414df7d
--- /dev/null
+++ b/src/pkg/path/filepath/path.go
@@ -0,0 +1,270 @@
+// 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 LICENSE file.
+
+// The filepath package implements utility routines for manipulating
+// filename paths in a way compatible with the target operating
+// system-defined file paths.
+package filepath
+
+import (
+	"os"
+	"sort"
+	"strings"
+)
+
+// BUG(niemeyer): Package filepath does not yet work on Windows.
+
+// Clean returns the shortest path name equivalent to path
+// by purely lexical processing.  It applies the following rules
+// iteratively until no further processing can be done:
+//
+//	1. Replace multiple Separator elements with a single one.
+//	2. Eliminate each . path name element (the current directory).
+//	3. Eliminate each inner .. path name element (the parent directory)
+//	   along with the non-.. element that precedes it.
+//	4. Eliminate .. elements that begin a rooted path:
+//	   that is, replace "/.." by "/" at the beginning of a path,
+//         assuming Separator is '/'.
+//
+// If the result of this process is an empty string, Clean
+// returns the string ".".
+//
+// See also Rob Pike, ``Lexical File Names in Plan 9 or
+// Getting Dot-Dot right,''
+// http://plan9.bell-labs.com/sys/doc/lexnames.html
+func Clean(path string) string {
+	if path == "" {
+		return "."
+	}
+
+	rooted := path[0] == Separator
+	n := len(path)
+
+	// Invariants:
+	//	reading from path; r is index of next byte to process.
+	//	writing to buf; w is index of next byte to write.
+	//	dotdot is index in buf where .. must stop, either because
+	//		it is the leading slash or it is a leading ../../.. prefix.
+	buf := []byte(path)
+	r, w, dotdot := 0, 0, 0
+	if rooted {
+		r, w, dotdot = 1, 1, 1
+	}
+
+	for r < n {
+		switch {
+		case path[r] == Separator:
+			// empty path element
+			r++
+		case path[r] == '.' && (r+1 == n || path[r+1] == Separator):
+			// . element
+			r++
+		case path[r] == '.' && path[r+1] == '.' && (r+2 == n || path[r+2] == Separator):
+			// .. element: remove to last separator
+			r += 2
+			switch {
+			case w > dotdot:
+				// can backtrack
+				w--
+				for w > dotdot && buf[w] != Separator {
+					w--
+				}
+			case !rooted:
+				// cannot backtrack, but not rooted, so append .. element.
+				if w > 0 {
+					buf[w] = Separator
+					w++
+				}
+				buf[w] = '.'
+				w++
+				buf[w] = '.'
+				w++
+				dotdot = w
+			}
+		default:
+			// real path element.
+			// add slash if needed
+			if rooted && w != 1 || !rooted && w != 0 {
+				buf[w] = Separator
+				w++
+			}
+			// copy element
+			for ; r < n && path[r] != Separator; r++ {
+				buf[w] = path[r]
+				w++
+			}
+		}
+	}
+
+	// Turn empty string into "."
+	if w == 0 {
+		buf[w] = '.'
+		w++
+	}
+
+	return string(buf[0:w])
+}
+
+// ToSlash returns the result of replacing each separator character
+// in path with a slash ('/') character.
+func ToSlash(path string) string {
+	if Separator == '/' {
+		return path
+	}
+	return strings.Replace(path, string(Separator), "/", -1)
+}
+
+// FromSlash returns the result of replacing each slash ('/') character
+// in path with a separator character.
+func FromSlash(path string) string {
+	if Separator == '/' {
+		return path
+	}
+	return strings.Replace(path, "/", string(Separator), -1)
+}
+
+// SplitList splits a list of paths joined by the OS-specific ListSeparator.
+func SplitList(path string) []string {
+	if path == "" {
+		return []string{}
+	}
+	return strings.Split(path, string(ListSeparator), -1)
+}
+
+// Split splits path immediately following the final Separator,
+// partitioning it into a directory and a file name components.
+// If there are no separators in path, Split returns an empty base
+// and file set to path.
+func Split(path string) (dir, file string) {
+	i := strings.LastIndex(path, string(Separator))
+	return path[:i+1], path[i+1:]
+}
+
+// Join joins any number of path elements into a single path, adding
+// a Separator if necessary.  All empty strings are ignored.
+func Join(elem ...string) string {
+	for i, e := range elem {
+		if e != "" {
+			return Clean(strings.Join(elem[i:], string(Separator)))
+		}
+	}
+	return ""
+}
+
+// Ext returns the file name extension used by path.
+// The extension is the suffix beginning at the final dot
+// in the final element of path; it is empty if there is
+// no dot.
+func Ext(path string) string {
+	for i := len(path) - 1; i >= 0 && path[i] != Separator; i-- {
+		if path[i] == '.' {
+			return path[i:]
+		}
+	}
+	return ""
+}
+
+// Visitor methods are invoked for corresponding file tree entries
+// visited by Walk. The parameter path is the full path of f relative
+// to root.
+type Visitor interface {
+	VisitDir(path string, f *os.FileInfo) bool
+	VisitFile(path string, f *os.FileInfo)
+}
+
+func walk(path string, f *os.FileInfo, v Visitor, errors chan<- os.Error) {
+	if !f.IsDirectory() {
+		v.VisitFile(path, f)
+		return
+	}
+
+	if !v.VisitDir(path, f) {
+		return // skip directory entries
+	}
+
+	list, err := readDir(path)
+	if err != nil {
+		if errors != nil {
+			errors <- err
+		}
+	}
+
+	for _, e := range list {
+		walk(Join(path, e.Name), e, v, errors)
+	}
+}
+
+// readDir reads the directory named by dirname and returns
+// a list of sorted directory entries.
+// Copied from io/ioutil to avoid the circular import.
+func readDir(dirname string) ([]*os.FileInfo, os.Error) {
+	f, err := os.Open(dirname, os.O_RDONLY, 0)
+	if err != nil {
+		return nil, err
+	}
+	list, err := f.Readdir(-1)
+	f.Close()
+	if err != nil {
+		return nil, err
+	}
+	fi := make(fileInfoList, len(list))
+	for i := range list {
+		fi[i] = &list[i]
+	}
+	sort.Sort(fi)
+	return fi, nil
+}
+
+// A dirList implements sort.Interface.
+type fileInfoList []*os.FileInfo
+
+func (f fileInfoList) Len() int           { return len(f) }
+func (f fileInfoList) Less(i, j int) bool { return f[i].Name < f[j].Name }
+func (f fileInfoList) Swap(i, j int)      { f[i], f[j] = f[j], f[i] }
+
+// Walk walks the file tree rooted at root, calling v.VisitDir or
+// v.VisitFile for each directory or file in the tree, including root.
+// If v.VisitDir returns false, Walk skips the directory's entries;
+// otherwise it invokes itself for each directory entry in sorted order.
+// An error reading a directory does not abort the Walk.
+// If errors != nil, Walk sends each directory read error
+// to the channel.  Otherwise Walk discards the error.
+func Walk(root string, v Visitor, errors chan<- os.Error) {
+	f, err := os.Lstat(root)
+	if err != nil {
+		if errors != nil {
+			errors <- err
+		}
+		return // can't progress
+	}
+	walk(root, f, v, errors)
+}
+
+// Base returns the last element of path.
+// Trailing path separators are removed before extracting the last element.
+// If the path is empty, Base returns ".".
+// If the path consists entirely of separators, Base returns a single separator.
+func Base(path string) string {
+	if path == "" {
+		return "."
+	}
+	// Strip trailing slashes.
+	for len(path) > 0 && path[len(path)-1] == Separator {
+		path = path[0 : len(path)-1]
+	}
+	// Find the last element
+	if i := strings.LastIndex(path, string(Separator)); i >= 0 {
+		path = path[i+1:]
+	}
+	// If empty now, it had only slashes.
+	if path == "" {
+		return string(Separator)
+	}
+	return path
+}
+
+// IsAbs returns true if the path is absolute.
+func IsAbs(path string) bool {
+	return len(path) > 0 && path[0] == Separator
+}
diff --git a/src/pkg/path/filepath/path_test.go b/src/pkg/path/filepath/path_test.go
new file mode 100644
index 0000000..469ca6a
--- /dev/null
+++ b/src/pkg/path/filepath/path_test.go
@@ -0,0 +1,387 @@
+// 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 LICENSE file.
+
+package filepath_test
+
+import (
+	"os"
+	"path/filepath"
+	"reflect"
+	"testing"
+)
+
+type PathTest struct {
+	path, result string
+}
+
+var cleantests = []PathTest{
+	// Already clean
+	{"", "."},
+	{"abc", "abc"},
+	{"abc/def", "abc/def"},
+	{"a/b/c", "a/b/c"},
+	{".", "."},
+	{"..", ".."},
+	{"../..", "../.."},
+	{"../../abc", "../../abc"},
+	{"/abc", "/abc"},
+	{"/", "/"},
+
+	// Remove trailing slash
+	{"abc/", "abc"},
+	{"abc/def/", "abc/def"},
+	{"a/b/c/", "a/b/c"},
+	{"./", "."},
+	{"../", ".."},
+	{"../../", "../.."},
+	{"/abc/", "/abc"},
+
+	// Remove doubled slash
+	{"abc//def//ghi", "abc/def/ghi"},
+	{"//abc", "/abc"},
+	{"///abc", "/abc"},
+	{"//abc//", "/abc"},
+	{"abc//", "abc"},
+
+	// Remove . elements
+	{"abc/./def", "abc/def"},
+	{"/./abc/def", "/abc/def"},
+	{"abc/.", "abc"},
+
+	// Remove .. elements
+	{"abc/def/ghi/../jkl", "abc/def/jkl"},
+	{"abc/def/../ghi/../jkl", "abc/jkl"},
+	{"abc/def/..", "abc"},
+	{"abc/def/../..", "."},
+	{"/abc/def/../..", "/"},
+	{"abc/def/../../..", ".."},
+	{"/abc/def/../../..", "/"},
+	{"abc/def/../../../ghi/jkl/../../../mno", "../../mno"},
+
+	// Combinations
+	{"abc/./../def", "def"},
+	{"abc//./../def", "def"},
+	{"abc/../../././../def", "../../def"},
+}
+
+func TestClean(t *testing.T) {
+	for _, test := range cleantests {
+		if s := filepath.Clean(test.path); s != test.result {
+			t.Errorf("Clean(%q) = %q, want %q", test.path, s, test.result)
+		}
+	}
+}
+
+const sep = filepath.Separator
+
+var slashtests = []PathTest{
+	{"", ""},
+	{"/", string(sep)},
+	{"/a/b", string([]byte{sep, 'a', sep, 'b'})},
+	{"a//b", string([]byte{'a', sep, sep, 'b'})},
+}
+
+func TestFromAndToSlash(t *testing.T) {
+	for _, test := range slashtests {
+		if s := filepath.FromSlash(test.path); s != test.result {
+			t.Errorf("FromSlash(%q) = %q, want %q", test.path, s, test.result)
+		}
+		if s := filepath.ToSlash(test.result); s != test.path {
+			t.Errorf("ToSlash(%q) = %q, want %q", test.result, s, test.path)
+		}
+	}
+}
+
+type SplitListTest struct {
+	list   string
+	result []string
+}
+
+const lsep = filepath.ListSeparator
+
+var splitlisttests = []SplitListTest{
+	{"", []string{}},
+	{string([]byte{'a', lsep, 'b'}), []string{"a", "b"}},
+	{string([]byte{lsep, 'a', lsep, 'b'}), []string{"", "a", "b"}},
+}
+
+func TestSplitList(t *testing.T) {
+	for _, test := range splitlisttests {
+		if l := filepath.SplitList(test.list); !reflect.DeepEqual(l, test.result) {
+			t.Errorf("SplitList(%q) = %s, want %s", test.list, l, test.result)
+		}
+	}
+}
+
+type SplitTest struct {
+	path, dir, file string
+}
+
+var unixsplittests = []SplitTest{
+	{"a/b", "a/", "b"},
+	{"a/b/", "a/b/", ""},
+	{"a/", "a/", ""},
+	{"a", "", "a"},
+	{"/", "/", ""},
+}
+
+func TestSplit(t *testing.T) {
+	var splittests []SplitTest
+	splittests = unixsplittests
+	for _, test := range splittests {
+		if d, f := filepath.Split(test.path); d != test.dir || f != test.file {
+			t.Errorf("Split(%q) = %q, %q, want %q, %q", test.path, d, f, test.dir, test.file)
+		}
+	}
+}
+
+type JoinTest struct {
+	elem []string
+	path string
+}
+
+var jointests = []JoinTest{
+	// zero parameters
+	{[]string{}, ""},
+
+	// one parameter
+	{[]string{""}, ""},
+	{[]string{"a"}, "a"},
+
+	// two parameters
+	{[]string{"a", "b"}, "a/b"},
+	{[]string{"a", ""}, "a"},
+	{[]string{"", "b"}, "b"},
+	{[]string{"/", "a"}, "/a"},
+	{[]string{"/", ""}, "/"},
+	{[]string{"a/", "b"}, "a/b"},
+	{[]string{"a/", ""}, "a"},
+	{[]string{"", ""}, ""},
+}
+
+// join takes a []string and passes it to Join.
+func join(elem []string, args ...string) string {
+	args = elem
+	return filepath.Join(args...)
+}
+
+func TestJoin(t *testing.T) {
+	for _, test := range jointests {
+		if p := join(test.elem); p != test.path {
+			t.Errorf("join(%q) = %q, want %q", test.elem, p, test.path)
+		}
+	}
+}
+
+type ExtTest struct {
+	path, ext string
+}
+
+var exttests = []ExtTest{
+	{"path.go", ".go"},
+	{"path.pb.go", ".go"},
+	{"a.dir/b", ""},
+	{"a.dir/b.go", ".go"},
+	{"a.dir/", ""},
+}
+
+func TestExt(t *testing.T) {
+	for _, test := range exttests {
+		if x := filepath.Ext(test.path); x != test.ext {
+			t.Errorf("Ext(%q) = %q, want %q", test.path, x, test.ext)
+		}
+	}
+}
+
+type Node struct {
+	name    string
+	entries []*Node // nil if the entry is a file
+	mark    int
+}
+
+var tree = &Node{
+	"testdata",
+	[]*Node{
+		&Node{"a", nil, 0},
+		&Node{"b", []*Node{}, 0},
+		&Node{"c", nil, 0},
+		&Node{
+			"d",
+			[]*Node{
+				&Node{"x", nil, 0},
+				&Node{"y", []*Node{}, 0},
+				&Node{
+					"z",
+					[]*Node{
+						&Node{"u", nil, 0},
+						&Node{"v", nil, 0},
+					},
+					0,
+				},
+			},
+			0,
+		},
+	},
+	0,
+}
+
+func walkTree(n *Node, path string, f func(path string, n *Node)) {
+	f(path, n)
+	for _, e := range n.entries {
+		walkTree(e, filepath.Join(path, e.name), f)
+	}
+}
+
+func makeTree(t *testing.T) {
+	walkTree(tree, tree.name, func(path string, n *Node) {
+		if n.entries == nil {
+			fd, err := os.Open(path, os.O_CREAT, 0660)
+			if err != nil {
+				t.Errorf("makeTree: %v", err)
+			}
+			fd.Close()
+		} else {
+			os.Mkdir(path, 0770)
+		}
+	})
+}
+
+func markTree(n *Node) { walkTree(n, "", func(path string, n *Node) { n.mark++ }) }
+
+func checkMarks(t *testing.T) {
+	walkTree(tree, tree.name, func(path string, n *Node) {
+		if n.mark != 1 {
+			t.Errorf("node %s mark = %d; expected 1", path, n.mark)
+		}
+		n.mark = 0
+	})
+}
+
+// Assumes that each node name is unique. Good enough for a test.
+func mark(name string) {
+	walkTree(tree, tree.name, func(path string, n *Node) {
+		if n.name == name {
+			n.mark++
+		}
+	})
+}
+
+type TestVisitor struct{}
+
+func (v *TestVisitor) VisitDir(path string, f *os.FileInfo) bool {
+	mark(f.Name)
+	return true
+}
+
+func (v *TestVisitor) VisitFile(path string, f *os.FileInfo) {
+	mark(f.Name)
+}
+
+func TestWalk(t *testing.T) {
+	makeTree(t)
+
+	// 1) ignore error handling, expect none
+	v := &TestVisitor{}
+	filepath.Walk(tree.name, v, nil)
+	checkMarks(t)
+
+	// 2) handle errors, expect none
+	errors := make(chan os.Error, 64)
+	filepath.Walk(tree.name, v, errors)
+	select {
+	case err := <-errors:
+		t.Errorf("no error expected, found: %s", err)
+	default:
+		// ok
+	}
+	checkMarks(t)
+
+	if os.Getuid() != 0 {
+		// introduce 2 errors: chmod top-level directories to 0
+		os.Chmod(filepath.Join(tree.name, tree.entries[1].name), 0)
+		os.Chmod(filepath.Join(tree.name, tree.entries[3].name), 0)
+		// mark respective subtrees manually
+		markTree(tree.entries[1])
+		markTree(tree.entries[3])
+		// correct double-marking of directory itself
+		tree.entries[1].mark--
+		tree.entries[3].mark--
+
+		// 3) handle errors, expect two
+		errors = make(chan os.Error, 64)
+		os.Chmod(filepath.Join(tree.name, tree.entries[1].name), 0)
+		filepath.Walk(tree.name, v, errors)
+	Loop:
+		for i := 1; i <= 2; i++ {
+			select {
+			case <-errors:
+				// ok
+			default:
+				t.Errorf("%d. error expected, none found", i)
+				break Loop
+			}
+		}
+		select {
+		case err := <-errors:
+			t.Errorf("only two errors expected, found 3rd: %v", err)
+		default:
+			// ok
+		}
+		// the inaccessible subtrees were marked manually
+		checkMarks(t)
+	}
+
+	// cleanup
+	os.Chmod(filepath.Join(tree.name, tree.entries[1].name), 0770)
+	os.Chmod(filepath.Join(tree.name, tree.entries[3].name), 0770)
+	if err := os.RemoveAll(tree.name); err != nil {
+		t.Errorf("removeTree: %v", err)
+	}
+}
+
+var basetests = []PathTest{
+	{"", "."},
+	{".", "."},
+	{"/.", "."},
+	{"/", "/"},
+	{"////", "/"},
+	{"x/", "x"},
+	{"abc", "abc"},
+	{"abc/def", "def"},
+	{"a/b/.x", ".x"},
+	{"a/b/c.", "c."},
+	{"a/b/c.x", "c.x"},
+}
+
+func TestBase(t *testing.T) {
+	for _, test := range basetests {
+		if s := filepath.Base(test.path); s != test.result {
+			t.Errorf("Base(%q) = %q, want %q", test.path, s, test.result)
+		}
+	}
+}
+
+type IsAbsTest struct {
+	path  string
+	isAbs bool
+}
+
+var isAbsTests = []IsAbsTest{
+	{"", false},
+	{"/", true},
+	{"/usr/bin/gcc", true},
+	{"..", false},
+	{"/a/../bb", true},
+	{".", false},
+	{"./", false},
+	{"lala", false},
+}
+
+func TestIsAbs(t *testing.T) {
+	for _, test := range isAbsTests {
+		if r := filepath.IsAbs(test.path); r != test.isAbs {
+			t.Errorf("IsAbs(%q) = %v, want %v", test.path, r, test.isAbs)
+		}
+	}
+}
diff --git a/src/pkg/path/filepath/path_unix.go b/src/pkg/path/filepath/path_unix.go
new file mode 100644
index 0000000..7d07794
--- /dev/null
+++ b/src/pkg/path/filepath/path_unix.go
@@ -0,0 +1,10 @@
+// Copyright 2010 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package filepath
+
+const (
+	Separator     = '/' // OS-specific path separator
+	ListSeparator = ':' // OS-specific path list separator
+)
diff --git a/src/pkg/path/match.go b/src/pkg/path/match.go
index dd3422c..efb8c5c 100644
--- a/src/pkg/path/match.go
+++ b/src/pkg/path/match.go
@@ -1,8 +1,11 @@
+// Copyright 2010 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
 package path
 
 import (
 	"os"
-	"sort"
 	"strings"
 	"utf8"
 )
@@ -10,7 +13,7 @@
 var ErrBadPattern = os.NewError("syntax error in pattern")
 
 // Match returns true if name matches the shell file name pattern.
-// The syntax used by pattern is:
+// The pattern syntax is:
 //
 //	pattern:
 //		{ term }
@@ -75,7 +78,7 @@
 	return len(name) == 0, nil
 }
 
-// scanChunk gets the next section of pattern, which is a non-star string
+// scanChunk gets the next segment of pattern, which is a non-star string
 // possibly preceded by a star.
 func scanChunk(pattern string) (star bool, chunk, rest string) {
 	for len(pattern) > 0 && pattern[0] == '*' {
@@ -92,7 +95,6 @@
 			if i+1 < len(pattern) {
 				i++
 			}
-			continue
 		case '[':
 			inrange = true
 		case ']':
@@ -203,76 +205,3 @@
 	}
 	return
 }
-
-// Glob returns the names of all files matching pattern or nil
-// if there is no matching file. The syntax of patterns is the same
-// as in Match. The pattern may describe hierarchical names such as
-// /usr/*/bin/ed.
-//
-func Glob(pattern string) (matches []string) {
-	if !hasMeta(pattern) {
-		if _, err := os.Stat(pattern); err == nil {
-			return []string{pattern}
-		}
-		return nil
-	}
-
-	dir, file := Split(pattern)
-	switch dir {
-	case "":
-		dir = "."
-	case "/":
-		// nothing
-	default:
-		dir = dir[0 : len(dir)-1] // chop off trailing '/'
-	}
-
-	if hasMeta(dir) {
-		for _, d := range Glob(dir) {
-			matches = glob(d, file, matches)
-		}
-	} else {
-		return glob(dir, file, nil)
-	}
-	return matches
-}
-
-// glob searches for files matching pattern in the directory dir
-// and appends them to matches.
-func glob(dir, pattern string, matches []string) []string {
-	fi, err := os.Stat(dir)
-	if err != nil {
-		return nil
-	}
-	if !fi.IsDirectory() {
-		return matches
-	}
-	d, err := os.Open(dir, os.O_RDONLY, 0666)
-	if err != nil {
-		return nil
-	}
-	defer d.Close()
-
-	names, err := d.Readdirnames(-1)
-	if err != nil {
-		return nil
-	}
-	sort.SortStrings(names)
-
-	for _, n := range names {
-		matched, err := Match(pattern, n)
-		if err != nil {
-			return matches
-		}
-		if matched {
-			matches = append(matches, Join(dir, n))
-		}
-	}
-	return matches
-}
-
-// hasMeta returns true if path contains any of the magic characters
-// recognized by Match.
-func hasMeta(path string) bool {
-	return strings.IndexAny(path, "*?[") != -1
-}
diff --git a/src/pkg/path/match_test.go b/src/pkg/path/match_test.go
index a1bf508..f377f10 100644
--- a/src/pkg/path/match_test.go
+++ b/src/pkg/path/match_test.go
@@ -75,31 +75,3 @@
 		}
 	}
 }
-
-// contains returns true if vector contains the string s.
-func contains(vector []string, s string) bool {
-	for _, elem := range vector {
-		if elem == s {
-			return true
-		}
-	}
-	return false
-}
-
-var globTests = []struct {
-	pattern, result string
-}{
-	{"match.go", "match.go"},
-	{"mat?h.go", "match.go"},
-	{"*", "match.go"},
-	{"../*/match.go", "../path/match.go"},
-}
-
-func TestGlob(t *testing.T) {
-	for _, tt := range globTests {
-		matches := Glob(tt.pattern)
-		if !contains(matches, tt.result) {
-			t.Errorf("Glob(%#q) = %#v want %v", tt.pattern, matches, tt.result)
-		}
-	}
-}
diff --git a/src/pkg/path/path.go b/src/pkg/path/path.go
index 61eea88..658eec0 100644
--- a/src/pkg/path/path.go
+++ b/src/pkg/path/path.go
@@ -7,8 +7,6 @@
 package path
 
 import (
-	"io/ioutil"
-	"os"
 	"strings"
 )
 
@@ -107,7 +105,7 @@
 // If there is no separator in path, Split returns an empty dir and
 // file set to path.
 func Split(path string) (dir, file string) {
-	i := strings.LastIndexAny(path, PathSeps)
+	i := strings.LastIndex(path, "/")
 	return path[:i+1], path[i+1:]
 }
 
@@ -135,78 +133,30 @@
 	return ""
 }
 
-// Visitor methods are invoked for corresponding file tree entries
-// visited by Walk. The parameter path is the full path of f relative
-// to root.
-type Visitor interface {
-	VisitDir(path string, f *os.FileInfo) bool
-	VisitFile(path string, f *os.FileInfo)
-}
-
-func walk(path string, f *os.FileInfo, v Visitor, errors chan<- os.Error) {
-	if !f.IsDirectory() {
-		v.VisitFile(path, f)
-		return
-	}
-
-	if !v.VisitDir(path, f) {
-		return // skip directory entries
-	}
-
-	list, err := ioutil.ReadDir(path)
-	if err != nil {
-		if errors != nil {
-			errors <- err
-		}
-	}
-
-	for _, e := range list {
-		walk(Join(path, e.Name), e, v, errors)
-	}
-}
-
-// Walk walks the file tree rooted at root, calling v.VisitDir or
-// v.VisitFile for each directory or file in the tree, including root.
-// If v.VisitDir returns false, Walk skips the directory's entries;
-// otherwise it invokes itself for each directory entry in sorted order.
-// An error reading a directory does not abort the Walk.
-// If errors != nil, Walk sends each directory read error
-// to the channel.  Otherwise Walk discards the error.
-func Walk(root string, v Visitor, errors chan<- os.Error) {
-	f, err := os.Lstat(root)
-	if err != nil {
-		if errors != nil {
-			errors <- err
-		}
-		return // can't progress
-	}
-	walk(root, f, v, errors)
-}
-
-// Base returns the last path element of the slash-separated name.
-// Trailing slashes are removed before extracting the last element.  If the name is
-// empty, "." is returned.  If it consists entirely of slashes, "/" is returned.
-func Base(name string) string {
-	if name == "" {
+// Base returns the last element of path.
+// Trailing slashes are removed before extracting the last element.
+// If the path is empty, Base returns ".".
+// If the path consists entirely of slashes, Base returns "/".
+func Base(path string) string {
+	if path == "" {
 		return "."
 	}
 	// Strip trailing slashes.
-	for len(name) > 0 && name[len(name)-1] == '/' {
-		name = name[0 : len(name)-1]
+	for len(path) > 0 && path[len(path)-1] == '/' {
+		path = path[0 : len(path)-1]
 	}
 	// Find the last element
-	if i := strings.LastIndex(name, "/"); i >= 0 {
-		name = name[i+1:]
+	if i := strings.LastIndex(path, "/"); i >= 0 {
+		path = path[i+1:]
 	}
 	// If empty now, it had only slashes.
-	if name == "" {
+	if path == "" {
 		return "/"
 	}
-	return name
+	return path
 }
 
 // IsAbs returns true if the path is absolute.
 func IsAbs(path string) bool {
-	// TODO: Add Windows support
-	return strings.HasPrefix(path, "/")
+	return len(path) > 0 && path[0] == '/'
 }
diff --git a/src/pkg/path/path_test.go b/src/pkg/path/path_test.go
index ab0b48a..1fd57cc 100644
--- a/src/pkg/path/path_test.go
+++ b/src/pkg/path/path_test.go
@@ -5,8 +5,6 @@
 package path
 
 import (
-	"os"
-	"runtime"
 	"testing"
 )
 
@@ -84,18 +82,7 @@
 	{"/", "/", ""},
 }
 
-var winsplittests = []SplitTest{
-	{`C:\Windows\System32`, `C:\Windows\`, `System32`},
-	{`C:\Windows\`, `C:\Windows\`, ``},
-	{`C:\Windows`, `C:\`, `Windows`},
-	{`C:Windows`, `C:`, `Windows`},
-	{`\\?\c:\`, `\\?\c:\`, ``},
-}
-
 func TestSplit(t *testing.T) {
-	if runtime.GOOS == "windows" {
-		splittests = append(splittests, winsplittests...)
-	}
 	for _, test := range splittests {
 		if d, f := Split(test.path); d != test.dir || f != test.file {
 			t.Errorf("Split(%q) = %q, %q, want %q, %q", test.path, d, f, test.dir, test.file)
@@ -161,152 +148,6 @@
 	}
 }
 
-type Node struct {
-	name    string
-	entries []*Node // nil if the entry is a file
-	mark    int
-}
-
-var tree = &Node{
-	"testdata",
-	[]*Node{
-		&Node{"a", nil, 0},
-		&Node{"b", []*Node{}, 0},
-		&Node{"c", nil, 0},
-		&Node{
-			"d",
-			[]*Node{
-				&Node{"x", nil, 0},
-				&Node{"y", []*Node{}, 0},
-				&Node{
-					"z",
-					[]*Node{
-						&Node{"u", nil, 0},
-						&Node{"v", nil, 0},
-					},
-					0,
-				},
-			},
-			0,
-		},
-	},
-	0,
-}
-
-func walkTree(n *Node, path string, f func(path string, n *Node)) {
-	f(path, n)
-	for _, e := range n.entries {
-		walkTree(e, Join(path, e.name), f)
-	}
-}
-
-func makeTree(t *testing.T) {
-	walkTree(tree, tree.name, func(path string, n *Node) {
-		if n.entries == nil {
-			fd, err := os.Open(path, os.O_CREAT, 0660)
-			if err != nil {
-				t.Errorf("makeTree: %v", err)
-			}
-			fd.Close()
-		} else {
-			os.Mkdir(path, 0770)
-		}
-	})
-}
-
-func markTree(n *Node) { walkTree(n, "", func(path string, n *Node) { n.mark++ }) }
-
-func checkMarks(t *testing.T) {
-	walkTree(tree, tree.name, func(path string, n *Node) {
-		if n.mark != 1 {
-			t.Errorf("node %s mark = %d; expected 1", path, n.mark)
-		}
-		n.mark = 0
-	})
-}
-
-// Assumes that each node name is unique. Good enough for a test.
-func mark(name string) {
-	walkTree(tree, tree.name, func(path string, n *Node) {
-		if n.name == name {
-			n.mark++
-		}
-	})
-}
-
-type TestVisitor struct{}
-
-func (v *TestVisitor) VisitDir(path string, f *os.FileInfo) bool {
-	mark(f.Name)
-	return true
-}
-
-func (v *TestVisitor) VisitFile(path string, f *os.FileInfo) {
-	mark(f.Name)
-}
-
-func TestWalk(t *testing.T) {
-	makeTree(t)
-
-	// 1) ignore error handling, expect none
-	v := &TestVisitor{}
-	Walk(tree.name, v, nil)
-	checkMarks(t)
-
-	// 2) handle errors, expect none
-	errors := make(chan os.Error, 64)
-	Walk(tree.name, v, errors)
-	select {
-	case err := <-errors:
-		t.Errorf("no error expected, found: %s", err)
-	default:
-		// ok
-	}
-	checkMarks(t)
-
-	if os.Getuid() != 0 {
-		// introduce 2 errors: chmod top-level directories to 0
-		os.Chmod(Join(tree.name, tree.entries[1].name), 0)
-		os.Chmod(Join(tree.name, tree.entries[3].name), 0)
-		// mark respective subtrees manually
-		markTree(tree.entries[1])
-		markTree(tree.entries[3])
-		// correct double-marking of directory itself
-		tree.entries[1].mark--
-		tree.entries[3].mark--
-
-		// 3) handle errors, expect two
-		errors = make(chan os.Error, 64)
-		os.Chmod(Join(tree.name, tree.entries[1].name), 0)
-		Walk(tree.name, v, errors)
-	Loop:
-		for i := 1; i <= 2; i++ {
-			select {
-			case <-errors:
-				// ok
-			default:
-				t.Errorf("%d. error expected, none found", i)
-				break Loop
-			}
-		}
-		select {
-		case err := <-errors:
-			t.Errorf("only two errors expected, found 3rd: %v", err)
-		default:
-			// ok
-		}
-		// the inaccessible subtrees were marked manually
-		checkMarks(t)
-	}
-
-	// cleanup
-	os.Chmod(Join(tree.name, tree.entries[1].name), 0770)
-	os.Chmod(Join(tree.name, tree.entries[3].name), 0770)
-	if err := os.RemoveAll(tree.name); err != nil {
-		t.Errorf("removeTree: %v", err)
-	}
-}
-
 var basetests = []CleanTest{
 	// Already clean
 	{"", "."},
diff --git a/src/pkg/path/path_unix.go b/src/pkg/path/path_unix.go
deleted file mode 100644
index 7e8c5eb..0000000
--- a/src/pkg/path/path_unix.go
+++ /dev/null
@@ -1,11 +0,0 @@
-// Copyright 2010 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package path
-
-const (
-	DirSeps    = `/`                  // directory separators
-	VolumeSeps = ``                   // volume separators
-	PathSeps   = DirSeps + VolumeSeps // all path separators
-)
diff --git a/src/pkg/path/path_windows.go b/src/pkg/path/path_windows.go
deleted file mode 100644
index 966eb49..0000000
--- a/src/pkg/path/path_windows.go
+++ /dev/null
@@ -1,11 +0,0 @@
-// Copyright 2010 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package path
-
-const (
-	DirSeps    = `\/`                 // directory separators
-	VolumeSeps = `:`                  // volume separators
-	PathSeps   = DirSeps + VolumeSeps // all path separators
-)