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/* $Id: plugin_cfg.c,v 1.8 2004/03/11 06:39:59 reinelt Exp $
*
* plugin for config file access
*
* Copyright 2003, 2004 Michael Reinelt <reinelt@eunet.at>
* Copyright 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.
*
*
* $Log: plugin_cfg.c,v $
* Revision 1.8 2004/03/11 06:39:59 reinelt
* big patch from Martin:
* - reuse filehandles
* - memory leaks fixed
* - earlier busy-flag checking with HD44780
* - reuse memory for strings in RESULT and hash
* - netdev_fast to wavid time-consuming regex
*
* Revision 1.7 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 1.6 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 1.5 2004/02/01 19:37:40 reinelt
* got rid of every strtok() incarnation.
*
* Revision 1.4 2004/01/30 20:57:56 reinelt
* HD44780 patch from Martin Hejl
* dmalloc integrated
*
* Revision 1.3 2004/01/29 04:40:02 reinelt
* every .c file includes "config.h" now
*
* Revision 1.2 2004/01/14 11:33:00 reinelt
* new plugin 'uname' which does what it's called
* text widget nearly finished
* first results displayed on MatrixOrbital
*
* Revision 1.1 2004/01/13 10:03:01 reinelt
* new util 'hash' for associative arrays
* new plugin 'cpuinfo'
*
*/
/*
* 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) {
debug ("Variable %s = '%s' (%f)", l, R2S(&result), R2N(&result));
SetVariable (l, &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, 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)
{
}
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