/*
 * $Id$
 */

/*
 * Harbour Project source code:
 *   CTOOLS for Harbour, Math header file
 *
 * Copyright 2001  Alejandro de garate  <alex_degarate@hotmail.com>
 *
 * www - http://www.harbour-project.org
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this software; see the file COPYING.  If not, write to
 * the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
 * Boston, MA 02111-1307 USA (or visit the web site http://www.gnu.org/).
 *
 * As a special exception, the Harbour Project gives permission for
 * additional uses of the text contained in its release of Harbour.
 *
 * The exception is that, if you link the Harbour libraries with other
 * files to produce an executable, this does not by itself cause the
 * resulting executable to be covered by the GNU General Public License.
 * Your use of that executable is in no way restricted on account of
 * linking the Harbour library code into it.
 *
 * This exception does not however invalidate any other reasons why
 * the executable file might be covered by the GNU General Public License.
 *
 * This exception applies only to the code released by the Harbour
 * Project under the name Harbour.  If you copy code from other
 * Harbour Project or Free Software Foundation releases into a copy of
 * Harbour, as the General Public License permits, the exception does
 * not apply to the code that you add in this way.  To avoid misleading
 * anyone as to the status of such modified files, you must delete
 * this exception notice from them.
 *
 * If you write modifications of your own for Harbour, it is your choice
 * whether to permit this exception to apply to your modifications.
 * If you do not wish that, delete this exception notice.
 *
 */

#ifndef _CTMATH_H
#define _CTMATH_H

#include <math.h>
#include <float.h>
#include <limits.h>

/* initialization */
extern int ct_math_init (void);
extern int ct_math_exit (void);

/* set & get math error correction status */
extern void ct_setmatherrstatus (int iStatus);
extern int ct_getmatherrstatus (void);

/* set & get math error correction mode */
extern void ct_setmatherrmode (int iMode);
extern int ct_getmatherrmode (void);

/* functions to bracket CT3 math code */
void ct_matherrbegin (void);
void ct_matherrend (void);

/* stati and modes for math error correction */
#define CT_MATHERR_STATUS_NOTFOUND   HB_MATH_HANDLER_STATUS_NOTFOUND  /* math handler is not installed */
#define CT_MATHERR_STATUS_INACTIVE   HB_MATH_HANDLER_STATUS_INACTIVE  /* math handler is installed but inactive */
#define CT_MATHERR_STATUS_ACTIVE     HB_MATH_HANDLER_STATUS_ACTIVE    /* math handler is installed and active */

#define CT_MATHERR_MODE_NONE        0   /* no correction at all, program will exit */
#define CT_MATHERR_MODE_DEFAULT     1   /* default return value will be used, no error msgs ! */
#define CT_MATHERR_MODE_USER        2   /* error will be thrown to user who is responsible for error correction */
#define CT_MATHERR_MODE_USERDEFAULT 3   /* error will be thrown, but if user fails, default correction will be used */

/* CT3 math error handler */
extern int ct_matherr (HB_MATH_EXCEPTION * pexc);

/* set & get precision */
extern void ct_setprecision (int iPrecision);
extern int ct_getprecision();

#define CT_PI     3.14159265358979323846
#define CT_PI_2   1.57079632679489661923
#define CT_PI_RAD 0.0174532925199432957692  /* 3.14159265358979323846 / 180.0 */

#endif /* CTMATH_H */