sgp4-rs 0.4.1

Rust wrapper around the Vallado SGP-4 orbital propagator.
Documentation 
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#ifndef _sgp4ext_
#define _sgp4ext_
/*     ----------------------------------------------------------------
 *
 *                                 sgp4ext.h
 *
 *    this file contains extra routines needed for the main test program for
 * sgp4. these routines are derived from the astro libraries.
 *
 *                            companion code for
 *               fundamentals of astrodynamics and applications
 *                                    2007
 *                              by david vallado
 *
 *       (w) 719-573-2600, email dvallado@agi.com
 *
 *    current :
 *              20 apr 07  david vallado
 *                           misc documentation updates
 *    changes :
 *              14 aug 06  david vallado
 *                           original baseline
 *       ---------------------------------------------------------------- */

#include <math.h>
#include <string.h>

#include "sgp4unit.h"

// ------------------------- function declarations -------------------------

extern "C" {
  double sgn(double x);

  double mag(double x[3]);

  void cross(double vec1[3], double vec2[3], double outvec[3]);

  double dot(double x[3], double y[3]);

  double angle(double vec1[3], double vec2[3]);

  void newtonnu(double ecc, double nu, double &e0, double &m);

  double asinh(double xval);

  void rv2coe(double r[3], double v[3], double mu, double &p, double &a,
              double &ecc, double &incl, double &omega, double &argp, double &nu,
              double &m, double &arglat, double &truelon, double &lonper);

  void jday(int year, int mon, int day, int hr, int minute, double sec,
            double &jd);

  void days2mdhms(int year, double days, int &mon, int &day, int &hr, int &minute,
                  double &sec);

  void invjday(double jd, int &year, int &mon, int &day, int &hr,
               int &minute, double &sec);
}
#endif