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/* $Id: plugin_cfg.c 840 2007-09-09 12:17:42Z michael $
* $URL: https://ssl.bulix.org/svn/lcd4linux/trunk/plugin_cfg.c $
*
* plugin for config file access
*
* Copyright (C) 2003, 2004 Michael Reinelt <michael@reinelt.co.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 */
}
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