Adding upstream version 1.16.10.upstream/1.16.10upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 200 insertions, 0 deletions

diff --git a/src/path/filepath/path_windows.go b/src/path/filepath/path_windows.go
new file mode 100644
index 0000000..445c868
--- /dev/null
+++ b/src/path/filepath/path_windows.go
@@ -0,0 +1,200 @@
+// 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 (
+	"strings"
+	"syscall"
+)
+
+func isSlash(c uint8) bool {
+	return c == '\\' || c == '/'
+}
+
+// reservedNames lists reserved Windows names. Search for PRN in
+// https://docs.microsoft.com/en-us/windows/desktop/fileio/naming-a-file
+// for details.
+var reservedNames = []string{
+	"CON", "PRN", "AUX", "NUL",
+	"COM1", "COM2", "COM3", "COM4", "COM5", "COM6", "COM7", "COM8", "COM9",
+	"LPT1", "LPT2", "LPT3", "LPT4", "LPT5", "LPT6", "LPT7", "LPT8", "LPT9",
+}
+
+// isReservedName returns true, if path is Windows reserved name.
+// See reservedNames for the full list.
+func isReservedName(path string) bool {
+	if len(path) == 0 {
+		return false
+	}
+	for _, reserved := range reservedNames {
+		if strings.EqualFold(path, reserved) {
+			return true
+		}
+	}
+	return false
+}
+
+// IsAbs reports whether the path is absolute.
+func IsAbs(path string) (b bool) {
+	if isReservedName(path) {
+		return true
+	}
+	l := volumeNameLen(path)
+	if l == 0 {
+		return false
+	}
+	path = path[l:]
+	if path == "" {
+		return false
+	}
+	return isSlash(path[0])
+}
+
+// volumeNameLen returns length of the leading volume name on Windows.
+// It returns 0 elsewhere.
+func volumeNameLen(path string) int {
+	if len(path) < 2 {
+		return 0
+	}
+	// with drive letter
+	c := path[0]
+	if path[1] == ':' && ('a' <= c && c <= 'z' || 'A' <= c && c <= 'Z') {
+		return 2
+	}
+	// is it UNC? https://msdn.microsoft.com/en-us/library/windows/desktop/aa365247(v=vs.85).aspx
+	if l := len(path); l >= 5 && isSlash(path[0]) && isSlash(path[1]) &&
+		!isSlash(path[2]) && path[2] != '.' {
+		// first, leading `\\` and next shouldn't be `\`. its server name.
+		for n := 3; n < l-1; n++ {
+			// second, next '\' shouldn't be repeated.
+			if isSlash(path[n]) {
+				n++
+				// third, following something characters. its share name.
+				if !isSlash(path[n]) {
+					if path[n] == '.' {
+						break
+					}
+					for ; n < l; n++ {
+						if isSlash(path[n]) {
+							break
+						}
+					}
+					return n
+				}
+				break
+			}
+		}
+	}
+	return 0
+}
+
+// HasPrefix exists for historical compatibility and should not be used.
+//
+// Deprecated: HasPrefix does not respect path boundaries and
+// does not ignore case when required.
+func HasPrefix(p, prefix string) bool {
+	if strings.HasPrefix(p, prefix) {
+		return true
+	}
+	return strings.HasPrefix(strings.ToLower(p), strings.ToLower(prefix))
+}
+
+func splitList(path string) []string {
+	// The same implementation is used in LookPath in os/exec;
+	// consider changing os/exec when changing this.
+
+	if path == "" {
+		return []string{}
+	}
+
+	// Split path, respecting but preserving quotes.
+	list := []string{}
+	start := 0
+	quo := false
+	for i := 0; i < len(path); i++ {
+		switch c := path[i]; {
+		case c == '"':
+			quo = !quo
+		case c == ListSeparator && !quo:
+			list = append(list, path[start:i])
+			start = i + 1
+		}
+	}
+	list = append(list, path[start:])
+
+	// Remove quotes.
+	for i, s := range list {
+		list[i] = strings.ReplaceAll(s, `"`, ``)
+	}
+
+	return list
+}
+
+func abs(path string) (string, error) {
+	if path == "" {
+		// syscall.FullPath returns an error on empty path, because it's not a valid path.
+		// To implement Abs behavior of returning working directory on empty string input,
+		// special-case empty path by changing it to "." path. See golang.org/issue/24441.
+		path = "."
+	}
+	fullPath, err := syscall.FullPath(path)
+	if err != nil {
+		return "", err
+	}
+	return Clean(fullPath), nil
+}
+
+func join(elem []string) string {
+	for i, e := range elem {
+		if e != "" {
+			return joinNonEmpty(elem[i:])
+		}
+	}
+	return ""
+}
+
+// joinNonEmpty is like join, but it assumes that the first element is non-empty.
+func joinNonEmpty(elem []string) string {
+	if len(elem[0]) == 2 && elem[0][1] == ':' {
+		// First element is drive letter without terminating slash.
+		// Keep path relative to current directory on that drive.
+		// Skip empty elements.
+		i := 1
+		for ; i < len(elem); i++ {
+			if elem[i] != "" {
+				break
+			}
+		}
+		return Clean(elem[0] + strings.Join(elem[i:], string(Separator)))
+	}
+	// The following logic prevents Join from inadvertently creating a
+	// UNC path on Windows. Unless the first element is a UNC path, Join
+	// shouldn't create a UNC path. See golang.org/issue/9167.
+	p := Clean(strings.Join(elem, string(Separator)))
+	if !isUNC(p) {
+		return p
+	}
+	// p == UNC only allowed when the first element is a UNC path.
+	head := Clean(elem[0])
+	if isUNC(head) {
+		return p
+	}
+	// head + tail == UNC, but joining two non-UNC paths should not result
+	// in a UNC path. Undo creation of UNC path.
+	tail := Clean(strings.Join(elem[1:], string(Separator)))
+	if head[len(head)-1] == Separator {
+		return head + tail
+	}
+	return head + string(Separator) + tail
+}
+
+// isUNC reports whether path is a UNC path.
+func isUNC(path string) bool {
+	return volumeNameLen(path) > 2
+}
+
+func sameWord(a, b string) bool {
+	return strings.EqualFold(a, b)
+}