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/* $Id: plugin_math.c 840 2007-09-09 12:17:42Z michael $
* $URL: https://ssl.bulix.org/svn/lcd4linux/trunk/plugin_math.c $
*
* math plugin
*
* Copyright (C) 2003 Michael Reinelt <michael@reinelt.co.at>
* Copyright (C) 2004 The LCD4Linux Team <lcd4linux-devel@users.sourceforge.net>
*
* 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.
*
*/
/*
* 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);
}
static void my_floor(RESULT * result, RESULT * arg)
{
double value = floor(R2N(arg));
SetResult(&result, R_NUMBER, &value);
}
static void my_ceil(RESULT * result, RESULT * arg)
{
double value = ceil(R2N(arg));
SetResult(&result, R_NUMBER, &value);
}
static void my_decode(RESULT * result, int argc, RESULT * argv[])
{
int index;
if (argc < 2) {
error("decode(): wrong number of parameters");
SetResult(&result, R_STRING, "");
return;
}
index = R2N(argv[0]);
if (index < 0 || index >= argc - 1) {
SetResult(&result, R_STRING, "");
return;
}
CopyResult(&result, argv[index + 1]);
}
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);
/* floor, ceil */
AddFunction("floor", 1, my_floor);
AddFunction("ceil", 1, my_ceil);
/* decode */
AddFunction("decode", -1, my_decode);
return 0;
}
void plugin_exit_math(void)
{
}
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