From 368a83658223879b59b21ea4aeae6265c18be994 Mon Sep 17 00:00:00 2001
From: reinelt <reinelt@3ae390bd-cb1e-0410-b409-cd5a39f66f1f>
Date: Fri, 19 Dec 2003 05:50:34 +0000
Subject: [lcd4linux @ 2003-12-19 05:50:34 by reinelt] added plugin_math.c and
 plugin_string.c

git-svn-id: https://ssl.bulix.org/svn/lcd4linux/trunk@281 3ae390bd-cb1e-0410-b409-cd5a39f66f1f
---
 plugin_math.c | 128 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 128 insertions(+)
 create mode 100644 plugin_math.c

(limited to 'plugin_math.c')

diff --git a/plugin_math.c b/plugin_math.c
new file mode 100644
index 0000000..aaf5ec6
--- /dev/null
+++ b/plugin_math.c
@@ -0,0 +1,128 @@
+/* $Id: plugin_math.c,v 1.1 2003/12/19 05:50:34 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 1.1  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 <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
+  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);
+
+  return 0;
+}
+
-- 
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