Listing 1: Header file Rcvr.h
#ifndef Rcvr_h_included #define Rcvr_h_included /* * The following enum defines a standard set * of status codes. Any implementation of Rcvr * should map status codes returned by the * receiver to one of the codes defined here. * These should be the only status codes * returned from invocation of the function * pointers. */ enum RcvrStatusCodes {Success, Fail /* other codes */}; enum RcvrCmdCodes { SET_FREQ, GET_FREQ, GET_STATUS, SET_SCAN_RANGE, START_SCAN, STOP_SCAN }; typedef struct Rcvr { void *data; int (*setFreq) (struct Rcvr *r, const char *args); int (*getFreq)(struct Rcvr *r); int (*getStatus)(struct Rcvr *r); int (*setScanRange) (struct Rcvr *r, const char *args); int (*startScan)(struct Rcvr *r); int (*stopScan)(struct Rcvr *r); } Rcvr; #endif/* End of File */