library for C and Fortran mixed programming

 The CNF package comprises two sets of software which ease the task of writing
 portable programs in a mixture of FORTRAN and C. F77 is a set of C macros for
 handling the FORTRAN/C subroutine linkage in a portable way, and CNF is a set
 of functions to handle the difference between FORTRAN and C character strings,
 logical values and pointers to dynamically allocated memory.