def pathname2url(p):
    """OS-specific conversion from a file system path to a relative URL
    of the 'file' scheme; not recommended for general use."""
    # e.g.
    # C:\foo\bar\spam.foo
    # becomes
    # ///C|/foo/bar/spam.foo
    import urllib
    if not ':' in p:
        # No drive specifier, just convert slashes and quote the name
        if p[:2] == '\\\\':
        # path is something like \\host\path\on\remote\host
        # convert this to ////host/path/on/remote/host
        # (notice doubling of slashes at the start of the path)
            p = '\\\\' + p
        components = p.split('\\')
        return urllib.quote('/'.join(components))
    comp = p.split(':')
    if len(comp) != 2 or 1 > len(comp[0]):
        error = 'Bad path: ' + p
        raise IOError, error

    drive = urllib.quote(comp[0].upper())
    components = comp[1].split('\\')
    path = '///' + drive + ':'
    for comp in components:
        if comp:
            path = path + '/' + urllib.quote(comp)
    return path
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