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<H2><A NAME="SECTION00026000000000000000">
C Version</A>
</H2>
An ANSI C version of SLALIB is available from the author
but is not part of the Starlink release.
The functionality of this (proprietary) C version closely matches
that of the Starlink Fortran SLALIB, partly for the convenience of
existing users of the Fortran version, some of whom have in the past
implemented C ``wrappers''. The function names
cannot be the same as the Fortran versions because of potential
linking problems when
both forms of the library are present; the C routine which
is the equivalent of (for example) <TT>SLA_REFRO</TT> is <TT>slaRefro</TT>.
The types of arguments follow the Fortran version, except
that integers are <TT>int</TT> rather than <TT>long</TT>.
Argument passing is by value
(except for arrays and strings of course)
for given arguments and by pointer for returned arguments.
All the C functions are re-entrant.
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The Fortran routines <TT>sla_GRESID</TT>, <TT>sla_RANDOM</TT> and
<TT>sla_WAIT</TT> have no C counterparts.
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Further details of the C version of SLALIB are available
from the author. The definitive guide to
the calling sequences is the file <TT>slalib.h</TT>.
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<ADDRESS>
<I>SLALIB --- Positional Astronomy Library<BR>Starlink User Note 67<BR>P. T. Wallace<BR>12 October 1999<BR>E-mail:ptw@star.rl.ac.uk</I>
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