/* $Id: plugin_math.c,v 1.4 2004/03/06 20:31:16 reinelt Exp $ * * math plugin * * Copyright 2003 Michael Reinelt * * 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 #include #include #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=a1a2?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) { } d='n36' href='#n36'>36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203