EXTCENTRY(1)							  EXTCENTRY(1)

NAME    [Toc]    [Back]

     extcentry - extract FORTRAN-callable entry	points from a C	file

SYNOPSIS    [Toc]    [Back]

     extcentry infile outfile

DESCRIPTION    [Toc]    [Back]

     Extcentry is used to extract C functions for which	FORTRAN-callable
     interface routines	(wrappers) are to be generated by the program
     mkf2c(1).	Extcentry accepts as input any C file (infile),	and outputs
     (to outfile) only those portions which are	surrounded by the special
     comments /* CENTRY	*/ and /* ENDCENTRY */.

     The first step in generating a FORTRAN-to-C interface routine is to
     surround only those C functions for which entry points are	to be
     generated by these	special	comments and to	run the	file through
     extcentry.	The FORTRAN-to-C interface generator program mkf2c can then be
     invoked on	the resultant file to generate the assembly language wrapper.
     This is necessary since mkf2c understands only a limited subset of	the C
     grammar, and cannot parse such constructs as external declarations,
     typedefs, and C-preprocessor directives.

SEE ALSO    [Toc]    [Back]

     mkf2c(1)


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