[Issue 16487] New: Add function to obtain the available disk space

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=16487

          Issue ID: 16487
           Summary: Add function to obtain the available disk space
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P1
         Component: phobos
          Assignee: nobody at puremagic.com
          Reporter: jbc.engelen at gmail.com

Would be nice to have a function that returns the available disk space on a
given path (file, directory, server share).

Something like this:
```
// Returns ulong.max when the available disk space could not be determined.
ulong getAvailableDiskSpace(string path)
{
    import std.string: toStringz;
    version (WINDOWS)
    {
        import core.sys.windows.winbase;

        ULARGE_INTEGER freeBytesAvailable;
        auto pathCstr = (driveName(path) ~ dirSeparator).toStringz();
        bool success = GetDiskFreeSpaceExW(path, &freeBytesAvailable, null,
null);
        return success ? free_bytes.QuadPart : ulong.max;
    }
    else
    {
        import core.sys.posix.sys.statvfs;

        statvfs_t stats;
        int err = statvfs(path.toStringz(), &stats);
        return !err ? stats.f_bavail * stats.f_frsize : ulong.max;
    }
}
```

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