int sds_defun (const char *funname, int funcode);
Define a new LISP function and its code.
This function defines a function by associating its function name, which the user can type at the command line, with its function code and which can be used by sds_getfuncode.
The command to undefine the function is sds_undef, which requires the same arguments.
The argument funname represents the command to be typed at the command line. The argument funcode represents the function code, by which sds_getfuncode can access this function.
This function returns one of the following: RTNORM or an error code.
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Programming Overview of SDS (Solutions Development System)