file.c:1473
static inline char *
skipprefix(path)
    const char *path;
{
#ifdef DOSISH_UNC
    if (isdirsep(path[0]) && isdirsep(path[1])) {
	if (*(path = nextdirsep(path + 2)))
	    path = nextdirsep(path + 1);
	return (char *)path;
    }
#endif
#ifdef DOSISH_DRIVE_LETTER
    if (has_drive_letter(path))
	return (char *)(path + 2);
#endif
    return (char *)path;
}
