EXTCENTRY(1)                                         EXTCENTRY(1)



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

     SYNOPSIS
          extcentry infile outfile

     DESCRIPTION
          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
          mkf2c(1)

     AUTHOR
          Greg Boyd

     ORIGIN
          Silicon Graphics, Inc.





















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