Fixed build constraints for other systems

src/fs/Walk_fast.go

@@ -0,0 +1,63 @@
+//go:build linux || darwin
+
+package fs
+
+import (
+	"syscall"
+	"unsafe"
+)
+
+// Walk calls your callback function for every file name inside the directory.
+// It doesn't distinguish between files and directories.
+func Walk(directory string, callBack func(string)) error {
+	fd, err := syscall.Open(directory, 0, 0)
+
+	if err != nil {
+		return err
+	}
+
+	defer syscall.Close(fd)
+	buffer := make([]byte, 1024)
+
+	for {
+		n, err := syscall.ReadDirent(fd, buffer)
+
+		if err != nil {
+			return err
+		}
+
+		if n <= 0 {
+			break
+		}
+
+		readBuffer := buffer[:n]
+
+		for len(readBuffer) > 0 {
+			dirent := (*syscall.Dirent)(unsafe.Pointer(&readBuffer[0]))
+			readBuffer = readBuffer[dirent.Reclen:]
+
+			// Skip deleted files
+			if dirent.Ino == 0 {
+				continue
+			}
+
+			// Skip hidden files
+			if dirent.Name[0] == '.' {
+				continue
+			}
+
+			for i, c := range dirent.Name {
+				if c != 0 {
+					continue
+				}
+
+				bytePointer := (*byte)(unsafe.Pointer(&dirent.Name[0]))
+				name := unsafe.String(bytePointer, i)
+				callBack(name)
+				break
+			}
+		}
+	}
+
+	return nil
+}