/* $Id$
 * $URL$
 *
 * plugin for config file access
 *
 * Copyright (C) 2003, 2004 Michael Reinelt <reinelt@eunet.at>
 * Copyright (C) 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.
 *
 */

/* 
 * exported functions:
 *
 * int plugin_init_cfg (void)
 *  adds cfg() function for config access
 *  initializes variables from the config file
 *
 */


#include "config.h"

#include <stdlib.h>
#include <stdio.h>
#include <string.h>

#include "debug.h"
#include "evaluator.h"
#include "plugin.h"
#include "cfg.h"

#ifdef WITH_DMALLOC
#include <dmalloc.h>
#endif


static void load_variables(void)
{
    char *section = "Variables";
    char *list, *l, *p;
    char *expression;
    void *tree;
    RESULT result = { 0, 0, 0, NULL };

    list = cfg_list(section);
    l = list;
    while (l != NULL) {
	while (*l == '|')
	    l++;
	if ((p = strchr(l, '|')) != NULL)
	    *p = '\0';
	if (strchr(l, '.') != NULL || strchr(l, ':') != 0) {
	    error("ignoring variable '%s' from %s: structures not allowed", l, cfg_source());
	} else {
	    expression = cfg_get_raw(section, l, "");
	    if (expression != NULL && *expression != '\0') {
		tree = NULL;
		if (Compile(expression, &tree) == 0 && Eval(tree, &result) == 0) {
		    SetVariable(l, &result);
		    debug("Variable %s = '%s' (%g)", l, R2S(&result), R2N(&result));
		    DelResult(&result);
		} else {
		    error("error evaluating variable '%s' from %s", list, cfg_source());
		}
		DelTree(tree);
	    }
	}
	l = p ? p + 1 : NULL;
    }
    free(list);

}


static void my_cfg(RESULT * result, const int argc, RESULT * argv[])
{
    int i, len;
    char *value;
    char *buffer;

    /* calculate key length */
    len = 0;
    for (i = 0; i < argc; i++) {
	len += strlen(R2S(argv[i])) + 1;
    }

    /* allocate key buffer */
    buffer = malloc(len + 1);

    /* prepare key buffer */
    *buffer = '\0';
    for (i = 0; i < argc; i++) {
	strcat(buffer, ".");
	strcat(buffer, R2S(argv[i]));
    }

    /* buffer starts with '.', so cut off first char */
    value = cfg_get("", buffer + 1, "");

    /* store result */
    SetResult(&result, R_STRING, value);

    /* free buffer again */
    free(buffer);

    free(value);
}


int plugin_init_cfg(void)
{
    /* load "Variables" section from cfg */
    load_variables();

    /* register plugin */
    AddFunction("cfg", -1, my_cfg);

    return 0;
}

void plugin_exit_cfg(void)
{
    /* empty */
}
er&amp;id=3d24b9bd4612dd293bde38976798288ecb4e1722&amp;follow=1'>[lcd4linux @ 2001-03-16 16:40:17 by ltoetsch]</a></td><td>ltoetsch</td><td>12</td><td><span class='deletions'>-24</span>/<span class='insertions'>+112</span></td></tr>
<tr><td><span title='2001-03-16 09:28:08 +0000'>2001-03-16</span></td><td><a href='/lcd4linux.git/commit/processor.c?h=master&amp;id=8cb47a24a9ab1b5bbf81819d4567be4308db2b54&amp;follow=1'>[lcd4linux @ 2001-03-16 09:28:08 by ltoetsch]</a></td><td>ltoetsch</td><td>5</td><td><span class='deletions'>-11</span>/<span class='insertions'>+35</span></td></tr>
<tr><td><span title='2001-03-15 15:49:23 +0000'>2001-03-15</span></td><td><a href='/lcd4linux.git/commit/processor.c?h=master&amp;id=f28003f1779e7e560ccc70e90d88b376208f6cd6&amp;follow=1'>[lcd4linux @ 2001-03-15 15:49:22 by ltoetsch]</a></td><td>ltoetsch</td><td>3</td><td><span class='deletions'>-14</span>/<span class='insertions'>+27</span></td></tr>
<tr><td><span title='2001-03-15 14:25:05 +0000'>2001-03-15</span></td><td><a href='/lcd4linux.git/commit/socket.c?h=master&amp;id=cafef33d38d19a9075897b7484a5cb2c594da1da&amp;follow=1'>[lcd4linux @ 2001-03-15 14:25:05 by ltoetsch]</a></td><td>ltoetsch</td><td>11</td><td><span class='deletions'>-125</span>/<span class='insertions'>+278</span></td></tr>
<tr><td><span title='2001-03-15 11:10:53 +0000'>2001-03-15</span></td><td><a href='/lcd4linux.git/commit/mail2.c?h=master&amp;id=05ed83934da5b17841c34009456e9e27073a488a&amp;follow=1'>[lcd4linux @ 2001-03-15 11:10:53 by ltoetsch]</a></td><td>ltoetsch</td><td>1</td><td><span class='deletions'>-1</span>/<span class='insertions'>+8</span></td></tr>
<tr><td><span title='2001-03-15 09:47:13 +0000'>2001-03-15</span></td><td><a href='/lcd4linux.git/commit/processor.c?h=master&amp;id=1bbd55d6180fc18c16b401eafae2fa7ab84d01fa&amp;follow=1'>[lcd4linux @ 2001-03-15 09:47:13 by reinelt]</a></td><td>reinelt</td><td>3</td><td><span class='deletions'>-16</span>/<span class='insertions'>+31</span></td></tr>
<tr><td><span title='2001-03-15 09:13:22 +0000'>2001-03-15</span></td><td><a href='/lcd4linux.git/commit/exec.c?h=master&amp;id=4b219e09f035d52e3f02b4a4fd042185a06fb670&amp;follow=1'>[lcd4linux @ 2001-03-15 09:13:22 by ltoetsch]</a></td><td>ltoetsch</td><td>1</td><td><span class='deletions'>-2</span>/<span class='insertions'>+9</span></td></tr>
<tr><td><span title='2001-03-14 16:47:41 +0000'>2001-03-14</span></td><td><a href='/lcd4linux.git/commit/TODO?h=master&amp;id=6332ea0ded15b1ec775ffdb94cc7d8c779138356&amp;follow=1'>[lcd4linux @ 2001-03-14 16:47:41 by reinelt]</a></td><td>reinelt</td><td>3</td><td><span class='deletions'>-41</span>/<span class='insertions'>+59</span></td></tr>
<tr><td><span title='2001-03-14 15:30:53 +0000'>2001-03-14</span></td><td><a href='/lcd4linux.git/commit/HD44780.c?h=master&amp;id=3ede643c6ae5328dddda6c39a9a4c992c8f1fed7&amp;follow=1'>[lcd4linux @ 2001-03-14 15:30:53 by reinelt]</a></td><td>reinelt</td><td>1</td><td><span class='deletions'>-21</span>/<span class='insertions'>+34</span></td></tr>
<tr><td><span title='2001-03-14 15:14:59 +0000'>2001-03-14</span></td><td><a href='/lcd4linux.git/commit/lcd4linux.conf.sample?h=master&amp;id=911169ea04acef49f285158270ac94c1153d90d8&amp;follow=1'>[lcd4linux @ 2001-03-14 15:14:59 by reinelt]</a></td><td>reinelt</td><td>8</td><td><span class='deletions'>-152</span>/<span class='insertions'>+365</span></td></tr>
<tr><td><span title='2001-03-14 13:19:29 +0000'>2001-03-14</span></td><td><a href='/lcd4linux.git/commit/socket.h?h=master&amp;id=dfc23a8138bb7aa72043d754170c1c48e66485c0&amp;follow=1'>[lcd4linux @ 2001-03-14 13:19:29 by ltoetsch]</a></td><td>ltoetsch</td><td>16</td><td><span class='deletions'>-128</span>/<span class='insertions'>+773</span></td></tr>
<tr><td><span title='2001-03-13 08:34:15 +0000'>2001-03-13</span></td><td><a href='/lcd4linux.git/commit/system.c?h=master&amp;id=f3076919635e550ed752db4030468a3f256f60a1&amp;follow=1'>[lcd4linux @ 2001-03-13 08:34:15 by reinelt]</a></td><td>reinelt</td><td>6</td><td><span class='deletions'>-29</span>/<span class='insertions'>+50</span></td></tr>
<tr><td><span title='2001-03-13 08:03:41 +0000'>2001-03-13</span></td><td><a href='/lcd4linux.git/commit/acconfig.h?h=master&amp;id=ab548cb3e831ea2443d6362acc319eb01c0ceab6&amp;follow=1'>[lcd4linux @ 2001-03-13 08:03:41 by reinelt]</a></td><td>reinelt</td><td>3</td><td><span class='deletions'>-1</span>/<span class='insertions'>+35</span></td></tr>
<tr><td><span title='2001-03-13 07:53:00 +0000'>2001-03-13</span></td><td><a href='/lcd4linux.git/commit/Makefile.in?h=master&amp;id=6132a83fb8a4b6158222fbf6080656fac105c470&amp;follow=1'>[lcd4linux @ 2001-03-13 07:53:00 by reinelt]</a></td><td>reinelt</td><td>2</td><td><span class='deletions'>-13</span>/<span class='insertions'>+15</span></td></tr>
<tr><td><span title='2001-03-13 07:41:22 +0000'>2001-03-13</span></td><td><a href='/lcd4linux.git/commit/lcd4linux.c?h=master&amp;id=fff98857c9d3c95a5c7fcd9c8b6c4b15ca183a71&amp;follow=1'>[lcd4linux @ 2001-03-13 07:41:22 by reinelt]</a></td><td>reinelt</td><td>3</td><td><span class='deletions'>-2</span>/<span class='insertions'>+52</span></td></tr>
<tr><td><span title='2001-03-12 13:44:58 +0000'>2001-03-12</span></td><td><a href='/lcd4linux.git/commit/udelay.h?h=master&amp;id=064f4880a2349039356945b3a9f2081f035c32c1&amp;follow=1'>[lcd4linux @ 2001-03-12 13:44:58 by reinelt]</a></td><td>reinelt</td><td>8</td><td><span class='deletions'>-58</span>/<span class='insertions'>+232</span></td></tr>
<tr><td><span title='2001-03-12 12:49:24 +0000'>2001-03-12</span></td><td><a href='/lcd4linux.git/commit/configure.in?h=master&amp;id=62fdec1130f15faf0ed0562f79525f64f7f6e9bd&amp;follow=1'>[lcd4linux @ 2001-03-12 12:49:24 by reinelt]</a></td><td>reinelt</td><td>2</td><td><span class='deletions'>-63</span>/<span class='insertions'>+71</span></td></tr>
<tr><td><span title='2001-03-12 12:39:36 +0000'>2001-03-12</span></td><td><a href='/lcd4linux.git/commit/udelay.h?h=master&amp;id=3f2399e0a62d4df4e055ec5273f5b7738c55e81d&amp;follow=1'>[lcd4linux @ 2001-03-12 12:39:36 by reinelt]</a></td><td>reinelt</td><td>14</td><td><span class='deletions'>-448</span>/<span class='insertions'>+830</span></td></tr>
<tr><td><span title='2001-03-09 16:24:30 +0000'>2001-03-09</span></td><td><a href='/lcd4linux.git/commit/configure.in?h=master&amp;id=ae1c4ae6f41459fdd78ac41cc43fdfa34cdc1067&amp;follow=1'>[lcd4linux @ 2001-03-09 16:24:30 by ltoetsch]</a></td><td>ltoetsch</td><td>2</td><td><span class='deletions'>-155</span>/<span class='insertions'>+345</span></td></tr>
<tr><td><span title='2001-03-09 15:04:53 +0000'>2001-03-09</span></td><td><a href='/lcd4linux.git/commit/configure?h=master&amp;id=3ebeb1868ff674096294f7abe90e8d11845a794c&amp;follow=1'>[lcd4linux @ 2001-03-09 15:04:53 by reinelt]</a></td><td>reinelt</td><td>3</td><td><span class='deletions'>-103</span>/<span class='insertions'>+109</span></td></tr>
<tr><td><span title='2001-03-09 14:30:01 +0000'>2001-03-09</span></td><td><a href='/lcd4linux.git/commit/TODO?h=master&amp;id=ae91355deae7f98b5786c78bee9805d1348a64a1&amp;follow=1'>[lcd4linux @ 2001-03-09 14:30:01 by reinelt]</a></td><td>reinelt</td><td>1</td><td><span class='deletions'>-0</span>/<span class='insertions'>+7</span></td></tr>
<tr><td><span title='2001-03-09 14:24:49 +0000'>2001-03-09</span></td><td><a href='/lcd4linux.git/commit/lcd4linux.conf.sample?h=master&amp;id=1a47930ac414d55721085a2b8983d301bb0dbacc&amp;follow=1'>[lcd4linux @ 2001-03-09 14:24:49 by ltoetsch]</a></td><td>ltoetsch</td><td>3</td><td><span class='deletions'>-7</span>/<span class='insertions'>+18</span></td></tr>
<tr><td><span title='2001-03-09 13:08:11 +0000'>2001-03-09</span></td><td><a href='/lcd4linux.git/commit/lcd4linux.conf.sample?h=master&amp;id=d216db15731515a28358a8b8a13e06817343cc81&amp;follow=1'>[lcd4linux @ 2001-03-09 13:08:11 by ltoetsch]</a></td><td>ltoetsch</td><td>12</td><td><span class='deletions'>-86</span>/<span class='insertions'>+384</span></td></tr>
<tr><td><span title='2001-03-09 12:14:24 +0000'>2001-03-09</span></td><td><a href='/lcd4linux.git/commit/system.c?h=master&amp;id=9798af2267cd73c68b0ef22e9d2b27eac1aba2f5&amp;follow=1'>[lcd4linux @ 2001-03-09 12:14:24 by reinelt]</a></td><td>reinelt</td><td>4</td><td><span class='deletions'>-21</span>/<span class='insertions'>+34</span></td></tr>
<tr><td><span title='2001-03-08 15:25:38 +0000'>2001-03-08</span></td><td><a href='/lcd4linux.git/commit/processor.c?h=master&amp;id=824e3605cf8644295dc837a17f329c2e2bd619a3&amp;follow=1'>[lcd4linux @ 2001-03-08 15:25:38 by ltoetsch]</a></td><td>ltoetsch</td><td>9</td><td><span class='deletions'>-93</span>/<span class='insertions'>+214</span></td></tr>
<tr><td><span title='2001-03-08 09:02:04 +0000'>2001-03-08</span></td><td><a href='/lcd4linux.git/commit/seti.h?h=master&amp;id=af1aa94e53eea7a721806610ffdad0affe8d2d0f&amp;follow=1'>[lcd4linux @ 2001-03-08 09:02:04 by reinelt]</a></td><td>reinelt</td><td>4</td><td><span class='deletions'>-133</span>/<span class='insertions'>+21</span></td></tr>
<tr><td><span title='2001-03-08 08:39:55 +0000'>2001-03-08</span></td><td><a href='/lcd4linux.git/commit/processor.c?h=master&amp;id=3ed93cefbb0fe1943d1d5c53b238aaa7eb4d03dd&amp;follow=1'>[lcd4linux @ 2001-03-08 08:39:54 by reinelt]</a></td><td>reinelt</td><td>2</td><td><span class='deletions'>-4</span>/<span class='insertions'>+12</span></td></tr>
<tr><td><span title='2001-03-07 18:10:21 +0000'>2001-03-07</span></td><td><a href='/lcd4linux.git/commit/processor.c?h=master&amp;id=21f603cb1ed2fd2ca5e009b50a1f6debc311c1ab&amp;follow=1'>[lcd4linux @ 2001-03-07 18:10:21 by ltoetsch]</a></td><td>ltoetsch</td><td>10</td><td><span class='deletions'>-110</span>/<span class='insertions'>+319</span></td></tr>
<tr><td><span title='2001-03-05 18:20:21 +0000'>2001-03-05</span></td><td><a href='/lcd4linux.git/commit/lcd4linux.conf.sample?h=master&amp;id=e8e1dc888de11ad73dbab1ea08d6b995dae83113&amp;follow=1'>[lcd4linux @ 2001-03-05 18:20:21 by reinelt]</a></td><td>reinelt</td><td>2</td><td><span class='deletions'>-13</span>/<span class='insertions'>+25</span></td></tr>
<tr><td><span title='2001-03-04 15:01:12 +0000'>2001-03-04</span></td><td><a href='/lcd4linux.git/commit/README.Raster?h=master&amp;id=a30ff3c4a40988b573dd094f6a5c3af5138b78eb&amp;follow=1'>[lcd4linux @ 2001-03-04 15:01:12 by ltoetsch]</a></td><td>ltoetsch</td><td>1</td><td><span class='deletions'>-3</span>/<span class='insertions'>+3</span></td></tr>
<tr><td><span title='2001-03-02 20:18:12 +0000'>2001-03-02</span></td><td><a href='/lcd4linux.git/commit/system.c?h=master&amp;id=4f3c19b6c507608b273a9e27c678d2d28596ee62&amp;follow=1'>[lcd4linux @ 2001-03-02 20:18:12 by reinelt]</a></td><td>reinelt</td><td>3</td><td><span class='deletions'>-36</span>/<span class='insertions'>+89</span></td></tr>