lcd4linux.git - lcd4linux

Age	Commit message (Expand)	Author	Files	Lines
2001-03-01	[lcd4linux @ 2001-03-01 15:11:30 by ltoetsch]	ltoetsch	1	-0/+8

/* $Id$ * $URL$ * * 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) { }