Initial commit: Go 1.23 release state

src/path/filepath/path_windows.go

@@ -0,0 +1,114 @@
+package filepath
+
+import (
+	"os"
+	"strings"
+	"syscall"
+)
+
+// 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 {
+	var b strings.Builder
+	var lastChar byte
+	for _, e := range elem {
+		switch {
+		case b.Len() == 0:
+			// Add the first non-empty path element unchanged.
+		case os.IsPathSeparator(lastChar):
+			// If the path ends in a slash, strip any leading slashes from the next
+			// path element to avoid creating a UNC path (any path starting with "\\")
+			// from non-UNC elements.
+			//
+			// The correct behavior for Join when the first element is an incomplete UNC
+			// path (for example, "\\") is underspecified. We currently join subsequent
+			// elements so Join("\\", "host", "share") produces "\\host\share".
+			for len(e) > 0 && os.IsPathSeparator(e[0]) {
+				e = e[1:]
+			}
+			// If the path is \ and the next path element is ??,
+			// add an extra .\ to create \.\?? rather than \??\
+			// (a Root Local Device path).
+			if b.Len() == 1 && strings.HasPrefix(e, "??") && (len(e) == len("??") || os.IsPathSeparator(e[2])) {
+				b.WriteString(`.\`)
+			}
+		case lastChar == ':':
+			// If the path ends in a colon, keep the path relative to the current directory
+			// on a drive and don't add a separator. Preserve leading slashes in the next
+			// path element, which may make the path absolute.
+			//
+			// 	Join(`C:`, `f`) = `C:f`
+			//	Join(`C:`, `\f`) = `C:\f`
+		default:
+			// In all other cases, add a separator between elements.
+			b.WriteByte('\\')
+			lastChar = '\\'
+		}
+		if len(e) > 0 {
+			b.WriteString(e)
+			lastChar = e[len(e)-1]
+		}
+	}
+	if b.Len() == 0 {
+		return ""
+	}
+	return Clean(b.String())
+}
+
+func sameWord(a, b string) bool {
+	return strings.EqualFold(a, b)
+}