1package system // import "github.com/docker/docker/pkg/system"
2
3import "golang.org/x/sys/windows"
4
5// GetLongPathName converts Windows short pathnames to full pathnames.
6// For example C:\Users\ADMIN~1 --> C:\Users\Administrator.
7// It is a no-op on non-Windows platforms
8func GetLongPathName(path string) (string, error) {
9	// See https://groups.google.com/forum/#!topic/golang-dev/1tufzkruoTg
10	p, err := windows.UTF16FromString(path)
11	if err != nil {
12		return "", err
13	}
14	b := p // GetLongPathName says we can reuse buffer
15	n, err := windows.GetLongPathName(&p[0], &b[0], uint32(len(b)))
16	if err != nil {
17		return "", err
18	}
19	if n > uint32(len(b)) {
20		b = make([]uint16, n)
21		_, err = windows.GetLongPathName(&p[0], &b[0], uint32(len(b)))
22		if err != nil {
23			return "", err
24		}
25	}
26	return windows.UTF16ToString(b), nil
27}
28