/* $Id: plugin_math.c,v 1.4 2004/03/06 20:31:16 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 1.4  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 <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
  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) 
{
}
2008-02-27</span></td><td><a href='/lcd4linux.git/commit/plugin_mpd.c?h=master&amp;id=d659635b44595c039e74851bc1e1ccf6e677bbf9&amp;follow=1'>plugin_mpd, update to v0.81, fix connection issues</a></td><td>michux</td><td>1</td><td><span class='deletions'>-31</span>/<span class='insertions'>+53</span></td></tr>
<tr><td><span title='2008-02-25 17:06:00 +0000'>2008-02-25</span></td><td><a href='/lcd4linux.git/commit/plugin_mpd.c?h=master&amp;id=26ee778b43d59a998d47595e9b05b96086525770&amp;follow=1'>update mpd plugin to v0.8 - makefile needs some work now</a></td><td>michux</td><td>1</td><td><span class='deletions'>-167</span>/<span class='insertions'>+201</span></td></tr>
<tr><td><span title='2008-01-28 19:03:37 +0000'>2008-01-28</span></td><td><a href='/lcd4linux.git/commit/plugin_gps.c?h=master&amp;id=533fb811bf2882ce7e8878a530aef4e674b82a90&amp;follow=1'>disable default emulator code</a></td><td>michux</td><td>1</td><td><span class='deletions'>-1</span>/<span class='insertions'>+1</span></td></tr>
<tr><td><span title='2008-01-28 17:25:22 +0000'>2008-01-28</span></td><td><a href='/lcd4linux.git/commit/plugin_mpd.c?h=master&amp;id=4b9b072415a7fc475674809218de0c1cb6e496d4&amp;follow=1'>minor updates</a></td><td>michux</td><td>1</td><td><span class='deletions'>-2</span>/<span class='insertions'>+8</span></td></tr>
<tr><td><span title='2008-01-28 17:03:27 +0000'>2008-01-28</span></td><td><a href='/lcd4linux.git/commit/widget_text.h?h=master&amp;id=2e6a20b9a8a2bc2f3c2023d0cd750b6e198ba743&amp;follow=1'>added pingpong scrolling</a></td><td>michux</td><td>2</td><td><span class='deletions'>-5</span>/<span class='insertions'>+53</span></td></tr>
<tr><td><span title='2008-01-24 12:39:55 +0000'>2008-01-24</span></td><td><a href='/lcd4linux.git/commit/plugin_mpd.c?h=master&amp;id=64fa72b0547217afe553718f7e2ac7abe6f55495&amp;follow=1'>git-svn-id: https://ssl.bulix.org/svn/lcd4linux/trunk@848 3ae390bd-cb1e-0410-...</a></td><td>michux</td><td>1</td><td><span class='deletions'>-312</span>/<span class='insertions'>+402</span></td></tr>
<tr><td><span title='2007-10-03 05:12:11 +0000'>2007-10-03</span></td><td><a href='/lcd4linux.git/commit/widget_text.h?h=master&amp;id=40bde26bc2c197093e512f8d5d83e5aeb66cbbbf&amp;follow=1'>automatic marquee patch from Manuel Grot</a></td><td>michael</td><td>2</td><td><span class='deletions'>-5</span>/<span class='insertions'>+13</span></td></tr>
<tr><td><span title='2007-10-01 15:49:21 +0000'>2007-10-01</span></td><td><a href='/lcd4linux.git/commit/udelay.c?h=master&amp;id=b4295fcc844e053df526da8498c4c09501824543&amp;follow=1'>RDTSC delay and inclusion of asm/msr.h removed</a></td><td>michael</td><td>5</td><td><span class='deletions'>-258</span>/<span class='insertions'>+14</span></td></tr>
<tr><td><span title='2007-10-01 15:04:49 +0000'>2007-10-01</span></td><td><a href='/lcd4linux.git/commit/smoketest.sh?h=master&amp;id=354b411f9ddf943fe35b380f11d52bd6201df131&amp;follow=1'>driver for Pertelian display by Andy Powell</a></td><td>michael</td><td>8</td><td><span class='deletions'>-16</span>/<span class='insertions'>+387</span></td></tr>
<tr><td><span title='2007-09-15 06:10:48 +0000'>2007-09-15</span></td><td><a href='/lcd4linux.git/commit/plugin_gps.c?h=master&amp;id=2dfe05bcccd321f4907cf976edceb409c27f2677&amp;follow=1'>GPS plugin V0.3 by michu</a></td><td>michael</td><td>1</td><td><span class='deletions'>-40</span>/<span class='insertions'>+143</span></td></tr>
<tr><td><span title='2007-09-15 06:06:21 +0000'>2007-09-15</span></td><td><a href='/lcd4linux.git/commit/plugin_gps.c?h=master&amp;id=1d0eeaa9ab90296f7887c579adbeb2fc9fa2d0db&amp;follow=1'>GPS plugin V0.2 by michu</a></td><td>michael</td><td>1</td><td><span class='deletions'>-69</span>/<span class='insertions'>+267</span></td></tr>
<tr><td><span title='2007-09-09 12:17:42 +0000'>2007-09-09</span></td><td><a href='/lcd4linux.git/commit/widget_timer.h?h=master&amp;id=6d5d1055eae7db6d459c3a16ada11ca013e70363&amp;follow=1'>email address changed</a></td><td>michael</td><td>107</td><td><span class='deletions'>-109</span>/<span class='insertions'>+109</span></td></tr>
<tr><td><span title='2007-07-27 10:10:41 +0000'>2007-07-27</span></td><td><a href='/lcd4linux.git/commit/udelay.c?h=master&amp;id=51bbebac48030fcc624e090fee24b368b8197f08&amp;follow=1'>Fix compilation with kernel 2.6.22 by Guillaume LECERF</a></td><td>michael</td><td>1</td><td><span class='deletions'>-1</span>/<span class='insertions'>+4</span></td></tr>
<tr><td><span title='2007-07-27 10:01:17 +0000'>2007-07-27</span></td><td><a href='/lcd4linux.git/commit/plugin_mpd.c?h=master&amp;id=1c822162c25c02121b89f0b226e38c6b1e7d207b&amp;follow=1'>MPD plugin patch from michu</a></td><td>michael</td><td>1</td><td><span class='deletions'>-1</span>/<span class='insertions'>+22</span></td></tr>
<tr><td><span title='2007-07-27 09:25:16 +0000'>2007-07-27</span></td><td><a href='/lcd4linux.git/commit/plugin_gps.c?h=master&amp;id=63194435c3760ea232a3dcb75c7f843e8b1a9055&amp;follow=1'>GPS plugin update by michu</a></td><td>michael</td><td>1</td><td><span class='deletions'>-131</span>/<span class='insertions'>+248</span></td></tr>
<tr><td><span title='2007-07-27 09:24:25 +0000'>2007-07-27</span></td><td><a href='/lcd4linux.git/commit/drv_generic_graphic.h?h=master&amp;id=91c4a099a9da2136687256019a0940155d339277&amp;follow=1'>indentation</a></td><td>michael</td><td>2</td><td><span class='deletions'>-106</span>/<span class='insertions'>+108</span></td></tr>
<tr><td><span title='2007-06-21 22:13:40 +0000'>2007-06-21</span></td><td><a href='/lcd4linux.git/commit/drv_X11.c?h=master&amp;id=e849821bad784c38a550953174da83d00a8ee549&amp;follow=1'>default for Brightness is 255</a></td><td>volker</td><td>1</td><td><span class='deletions'>-1</span>/<span class='insertions'>+1</span></td></tr>
<tr><td><span title='2007-06-20 15:03:41 +0000'>2007-06-20</span></td><td><a href='/lcd4linux.git/commit/drv_X11.c?h=master&amp;id=4e604a94f3872b465d51a124f832e3d295fc1772&amp;follow=1'>LCD::brightness in drv_X11 corrected</a></td><td>volker</td><td>1</td><td><span class='deletions'>-2</span>/<span class='insertions'>+10</span></td></tr>
<tr><td><span title='2007-06-20 13:47:24 +0000'>2007-06-20</span></td><td><a href='/lcd4linux.git/commit/drv_generic_graphic.h?h=master&amp;id=f2004be68776eaf223a4cba5a0b7e45cc5a72624&amp;follow=1'>global variable for backlight color</a></td><td>volker</td><td>1</td><td><span class='deletions'>-0</span>/<span class='insertions'>+1</span></td></tr>
<tr><td><span title='2007-06-20 13:44:30 +0000'>2007-06-20</span></td><td><a href='/lcd4linux.git/commit/drv_X11.c?h=master&amp;id=fdf19a1a522ce857a7ef1f12c8628e087d424b93&amp;follow=1'>keypad support completed; new property brightness implemented</a></td><td>volker</td><td>1</td><td><span class='deletions'>-40</span>/<span class='insertions'>+175</span></td></tr>
<tr><td><span title='2007-06-20 13:41:42 +0000'>2007-06-20</span></td><td><a href='/lcd4linux.git/commit/drv_Cwlinux.c?h=master&amp;id=a67cbe4975c81ecab2d1e2ed087d410534439c00&amp;follow=1'>maximum value for brightness is 8</a></td><td>volker</td><td>1</td><td><span class='deletions'>-2</span>/<span class='insertions'>+2</span></td></tr>
<tr><td><span title='2007-06-17 06:10:11 +0000'>2007-06-17</span></td><td><a href='/lcd4linux.git/commit/drv_X11.c?h=master&amp;id=0802e1b84e35ccd55158189fe0d892fd9dfdbf07&amp;follow=1'>buttons for X11 driver (thanks to Volker Gering)</a></td><td>michael</td><td>1</td><td><span class='deletions'>-8</span>/<span class='insertions'>+49</span></td></tr>
<tr><td><span title='2007-06-17 06:08:00 +0000'>2007-06-17</span></td><td><a href='/lcd4linux.git/commit/plugin_uname.c?h=master&amp;id=d3c68fc20d892252aa243d2e697386ec54065142&amp;follow=1'>Apple has no utsbuf.domainname (thanks to Volker Gering)</a></td><td>michael</td><td>1</td><td><span class='deletions'>-1</span>/<span class='insertions'>+1</span></td></tr>
<tr><td><span title='2007-06-17 06:06:19 +0000'>2007-06-17</span></td><td><a href='/lcd4linux.git/commit/evaluator.c?h=master&amp;id=2fcc2950e43cba7cd677057cde39c2766848616f&amp;follow=1'>strndup() replacement</a></td><td>michael</td><td>1</td><td><span class='deletions'>-0</span>/<span class='insertions'>+24</span></td></tr>
<tr><td><span title='2007-06-17 05:51:15 +0000'>2007-06-17</span></td><td><a href='/lcd4linux.git/commit/lcd4linux.c?h=master&amp;id=d6c3787acf186f58e3fda571e77f73bea7324f40&amp;follow=1'>better usage output by Volker Gering</a></td><td>michael</td><td>1</td><td><span class='deletions'>-4</span>/<span class='insertions'>+20</span></td></tr>
<tr><td><span title='2007-06-08 04:45:16 +0000'>2007-06-08</span></td><td><a href='/lcd4linux.git/commit/drv_Image.c?h=master&amp;id=684bc9f48bbd560618bb2c07f5482d28d1519644&amp;follow=1'>Image driver libgd dependancy fix</a></td><td>michael</td><td>5</td><td><span class='deletions'>-6</span>/<span class='insertions'>+31</span></td></tr>
<tr><td><span title='2007-06-04 04:11:31 +0000'>2007-06-04</span></td><td><a href='/lcd4linux.git/commit/plugin_mpd.c?h=master&amp;id=775475883e63c7486c3ec043d10f62502cf40826&amp;follow=1'>big MPD patch from Robert Buchholz</a></td><td>michael</td><td>1</td><td><span class='deletions'>-79</span>/<span class='insertions'>+86</span></td></tr>
<tr><td><span title='2007-05-19 11:43:32 +0000'>2007-05-19</span></td><td><a href='/lcd4linux.git/commit/plugins.m4?h=master&amp;id=cbde4d3f9281906feb5e051e6fa74ab065bd77c0&amp;follow=1'>gps plugin, code by michu / www.neophob.com</a></td><td>michael</td><td>7</td><td><span class='deletions'>-0</span>/<span class='insertions'>+580</span></td></tr>
<tr><td><span title='2007-05-17 05:23:46 +0000'>2007-05-17</span></td><td><a href='/lcd4linux.git/commit/drivers.m4?h=master&amp;id=93d751a7c3d5c6c1db576460a7f08bd80a0f3bb9&amp;follow=1'>compile error on m68k fixed (debian bug 405898)</a></td><td>michael</td><td>3</td><td><span class='deletions'>-10</span>/<span class='insertions'>+170</span></td></tr>
<tr><td><span title='2007-05-04 11:35:52 +0000'>2007-05-04</span></td><td><a href='/lcd4linux.git/commit/drv_LUIse.c?h=master&amp;id=db6911f350d69aa5fe72254c3104b5e8e3082b32&amp;follow=1'>typo in LUIse driver fixed</a></td><td>michael</td><td>1</td><td><span class='deletions'>-1</span>/<span class='insertions'>+1</span></td></tr>
<tr><td><span title='2007-05-02 05:10:55 +0000'>2007-05-02</span></td><td><a href='/lcd4linux.git/commit/plugin_mpd.c?h=master&amp;id=c909270be37026e4877acf556af0556f7d1356c6&amp;follow=1'>some compiler warnings fixed</a></td><td>michael</td><td>6</td><td><span class='deletions'>-8</span>/<span class='insertions'>+14</span></td></tr>
<tr><td><span title='2007-04-30 05:32:03 +0000'>2007-04-30</span></td><td><a href='/lcd4linux.git/commit/svn_version.h?h=master&amp;id=b8b8a6a2cf8726a86bc2ba58fc502ce5a4ac2b1d&amp;follow=1'>LCD4Linux-0.10.1-RC2</a></td><td>michael</td><td>1</td><td><span class='deletions'>-1</span>/<span class='insertions'>+1</span></td></tr>
<tr><td><span title='2007-04-30 05:29:22 +0000'>2007-04-30</span></td><td><a href='/lcd4linux.git/commit/ChangeLog?h=master&amp;id=416c593124a6b66e3c6c2c5615a7d3a6d1438897&amp;follow=1'>ChangeLog updated</a></td><td>michael</td><td>1</td><td><span class='deletions'>-1782</span>/<span class='insertions'>+3099</span></td></tr>
<tr><td><span title='2007-04-30 05:25:46 +0000'>2007-04-30</span></td><td><a href='/lcd4linux.git/commit/svn2cl.sh?h=master&amp;id=059c8eb1711ededdb8a8984b688811530b2e9f58&amp;follow=1'>svn2cl moved and optimized</a></td><td>michael</td><td>1</td><td><span class='deletions'>-6</span>/<span class='insertions'>+0</span></td></tr>