From 8f59bbc584905f461dc4d628e7347839612b3fcf Mon Sep 17 00:00:00 2001
From: reinelt <>
Date: Fri, 19 Dec 2003 05:35:14 +0000
Subject: [lcd4linux @ 2003-12-19 05:35:13 by reinelt] renamed 'client' to
 'plugin'

---
 plugin.c | 159 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 159 insertions(+)
 create mode 100644 plugin.c

(limited to 'plugin.c')

diff --git a/plugin.c b/plugin.c
new file mode 100644
index 0000000..d34d1cb
--- /dev/null
+++ b/plugin.c
@@ -0,0 +1,159 @@
+/* $Id: plugin.c,v 1.1 2003/12/19 05:35:14 reinelt Exp $
+ *
+ * plugin handler for the Evaluator
+ *
+ * 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.c,v $
+ * Revision 1.1  2003/12/19 05:35:14  reinelt
+ * renamed 'client' to 'plugin'
+ *
+ * Revision 1.1  2003/10/11 06:01:52  reinelt
+ *
+ * renamed expression.{c,h} to client.{c,h}
+ * added config file client
+ * new functions 'AddNumericVariable()' and 'AddStringVariable()'
+ * new parameter '-i' for interactive mode
+ *
+ * Revision 1.3  2003/10/06 05:51:15  reinelt
+ * functions: min(), max()
+ *
+ * Revision 1.2  2003/10/06 05:47:27  reinelt
+ * operators: ==, \!=, <=, >=
+ *
+ * Revision 1.1  2003/10/06 04:34:06  reinelt
+ * expression evaluator added
+ *
+ */
+
+/* 
+ * exported functions:
+ *
+ * int plugin_init (void)
+ *  initializes the expression evaluator
+ *  adds some handy constants and functions
+ *
+ */
+
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <math.h>
+#include <string.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_strlen (RESULT *result, RESULT *arg1)
+{
+  double value=strlen(R2S(arg1));
+  SetResult(&result, R_NUMBER, &value); 
+}
+
+
+int plugin_init (void)
+{
+  // set some handy constants
+  AddNumericVariable ("Pi", M_PI);
+  AddNumericVariable ("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);
+
+  // register some basic string functions
+  AddFunction ("strlen", 1, my_strlen);
+
+  
+  return 0;
+}
+
+
-- 
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