return the string "/".
If
.I path
-is a NULL pointer or points to an empty string, then both
+is a null pointer or points to an empty string, then both
.BR dirname ()
and
.BR basename ()
/usr/ / usr
usr . usr
/ / /
-\. . .
-\.. . ..
+\&. . .
+\&.. . ..
.TE
.SH RETURN VALUE
Both