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/* $Id: plugin_math.c,v 1.6 2004/06/26 12:05:00 reinelt Exp $
*
* math plugin
*
* Copyright 2003 Michael Reinelt <reinelt@eunet.at>
*
* This file is part of LCD4Linux.
*
* LCD4Linux 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.
*
* LCD4Linux 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 program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
*
* $Log: plugin_math.c,v $
* Revision 1.6 2004/06/26 12:05:00 reinelt
*
* uh-oh... the last CVS log message messed up things a lot...
*
* Revision 1.5 2004/06/26 09:27:21 reinelt
*
* added '-W' to CFLAGS
* changed all C++ comments to C ones
* cleaned up a lot of signed/unsigned mistakes
*
* Revision 1.4 2004/03/06 20:31:16 reinelt
* Complete rewrite of the evaluator to get rid of the code
* from mark Morley (because of license issues).
* The new Evaluator does a pre-compile of expressions, and
* stores them in trees. Therefore it should be reasonable faster...
*
* Revision 1.3 2004/03/03 03:47:04 reinelt
* big patch from Martin Hejl:
* - use qprintf() where appropriate
* - save CPU cycles on gettimeofday()
* - add quit() functions to free allocated memory
* - fixed lots of memory leaks
*
* Revision 1.2 2004/01/29 04:40:02 reinelt
* every .c file includes "config.h" now
*
* Revision 1.1 2003/12/19 05:50:34 reinelt
* added plugin_math.c and plugin_string.c
*
*/
/*
* exported functions:
*
* int plugin_init_math (void)
* adds some handy constants and functions
*
*/
#include "config.h"
#include <stdlib.h>
#include <stdio.h>
#include <math.h>
#include "debug.h"
#include "plugin.h"
static void my_sqrt (RESULT *result, RESULT *arg1)
{
double value=sqrt(R2N(arg1));
SetResult(&result, R_NUMBER, &value);
}
static void my_exp (RESULT *result, RESULT *arg1)
{
double value=exp(R2N(arg1));
SetResult(&result, R_NUMBER, &value);
}
static void my_ln (RESULT *result, RESULT *arg1)
{
double value=log(R2N(arg1));
SetResult(&result, R_NUMBER, &value);
}
static void my_log (RESULT *result, RESULT *arg1)
{
double value=log10(R2N(arg1));
SetResult(&result, R_NUMBER, &value);
}
static void my_sin (RESULT *result, RESULT *arg1)
{
double value=sin(R2N(arg1));
SetResult(&result, R_NUMBER, &value);
}
static void my_cos (RESULT *result, RESULT *arg1)
{
double value=cos(R2N(arg1));
SetResult(&result, R_NUMBER, &value);
}
static void my_tan (RESULT *result, RESULT *arg1)
{
double value=tan(R2N(arg1));
SetResult(&result, R_NUMBER, &value);
}
static void my_min (RESULT *result, RESULT *arg1, RESULT *arg2)
{
double a1=R2N(arg1);
double a2=R2N(arg2);
double value=a1<a2?a1:a2;
SetResult(&result, R_NUMBER, &value);
}
static void my_max (RESULT *result, RESULT *arg1, RESULT *arg2)
{
double a1=R2N(arg1);
double a2=R2N(arg2);
double value=a1>a2?a1:a2;
SetResult(&result, R_NUMBER, &value);
}
int plugin_init_math (void)
{
/* set some handy constants */
SetVariableNumeric ("Pi", M_PI);
SetVariableNumeric ("e", M_E);
/* register some basic math functions */
AddFunction ("sqrt", 1, my_sqrt);
AddFunction ("exp", 1, my_exp);
AddFunction ("ln", 1, my_ln);
AddFunction ("log", 1, my_log);
AddFunction ("sin", 1, my_sin);
AddFunction ("cos", 1, my_cos);
AddFunction ("tan", 1, my_tan);
/* min, max */
AddFunction ("min", 2, my_min);
AddFunction ("max", 2, my_max);
return 0;
}
void plugin_exit_math(void)
{
}
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