dtv-scan-tables.git - Digital TV scan tables

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Diffstat (limited to 'channels-conf/dvb-t/de-Koeln-Bonn')

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/* $Id: plugin_math.c,v 1.4 2004/03/06 20:31:16 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 1.4 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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