Library /sys$common/syshlp/helplib.hlb  —  CRTL  vfprintf  Arguments
 file_ptr

    A pointer to the file to which the output is directed.

 format

    A pointer to a string containing the format specification. For
    more information about format and conversion specifications and
    their corresponding arguments, see the "Understanding Input and
    Output" chapter of the HP C RTL Reference Manual.

 ap

    A list of expressions whose resultant types correspond to the
    conversion specifications given in the format specifications.
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