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/* $Id: plugin_sample.c,v 1.2 2004/01/13 10:03:01 reinelt Exp $ * * plugin template * * Copyright 2003 Michael Reinelt <reinelt@eunet.at> * Copyright 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. * * * $Log: plugin_sample.c,v $ * Revision 1.2 2004/01/13 10:03:01 reinelt * new util 'hash' for associative arrays * new plugin 'cpuinfo' * * Revision 1.1 2004/01/06 17:33:45 reinelt * * Evaluator: functions with variable argument lists * Evaluator: plugin_sample.c and README.Plugins added * */ /* * exported functions: * * int plugin_init_sample (void) * adds various functions * */ // define the include files you need #include <stdlib.h> #include <string.h> #include <ctype.h> // these should always be included #include "debug.h" #include "plugin.h" // sample function 'mul2' // takes one argument, a number // multiplies the number by 2.0 // Note: all local functions should be declared 'static' static void my_mul2 (RESULT *result, RESULT *arg1) { double param; double value; // Get Parameter // R2N stands for 'Result to Number' param=R2N(arg1); // calculate value value=param*2.0; // store result // when called with R_NUMBER, it assumes the // next parameter to be a pointer to double SetResult(&result, R_NUMBER, &value); } // sample function 'mul3' // takes one argument, a number // multiplies the number by 3.0 // same as 'mul2', but shorter static void my_mul3 (RESULT *result, RESULT *arg1) { // do it all in one line double value=R2N(arg1)*3.0; // store result SetResult(&result, R_NUMBER, &value); } // sample function 'diff' // takes two arguments, both numbers // returns |a-b| static void my_diff (RESULT *result, RESULT *arg1, RESULT *arg2) { // do it all in one line double value=R2N(arg1)-R2N(arg2); // some more calculations... if (value<0) value=-value; // store result SetResult(&result, R_NUMBER, &value); } // sample function 'answer' // takes no argument! // returns the answer to all questions static void my_answer (RESULT *result) { // we have to declare a variable because // SetResult needs a pointer double value=42; // store result SetResult(&result, R_NUMBER, &value); } // sample function 'length' // takes one argument, a string // returns the string length static void my_length (RESULT *result, RESULT *arg1) { // Note #1: value *must* be double! // Note #2: R2S stands for 'Result to String' double value=strlen(R2S(arg1)); // store result SetResult(&result, R_NUMBER, &value); } // sample function 'upcase' // takes one argument, a string // returns the string in upper case letters static void my_upcase (RESULT *result, RESULT *arg1) { char *value, *p; // create a local copy of the argument // Do *NOT* try to modify the original string! value=strdup(R2S(arg1)); // process the string for (p=value; *p!='\0'; p++) *p=toupper(*p); // store result // when called with R_STRING, it assumes the // next parameter to be a pointer to a string // 'value' is already a char*, so use 'value', not '&value' SetResult(&result, R_STRING, value); // free local copy again // Note that SetResult() makes its own string copy free (value); } // sample function 'cat' // takes variable number of arguments, all strings // returns all prameters concatenated static void my_concat (RESULT *result, int argc, RESULT *argv[]) { int i, len; char *value, *part; // start with a empty string value=strdup(""); // process all arguments for (i=0; i<argc; i++) { part=R2S(argv[i]); len=strlen(value)+strlen(part); value=realloc(value, len+1); strcat(value, part); } // store result SetResult(&result, R_STRING, value); // free local string free (value); } // plugin initialization // MUST NOT be declared 'static'! int plugin_init_sample (void) { // register all our cool functions // the second parameter is the number of arguments // -1 stands for variable argument list AddFunction ("mul2", 1, my_mul2); AddFunction ("mul3", 1, my_mul3); AddFunction ("answer", 0, my_answer); AddFunction ("diff", 2, my_diff); AddFunction ("length", 1, my_length); AddFunction ("upcase", 1, my_upcase); AddFunction ("concat", -1, my_concat); return 0; }


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