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plugin_cfg.c

/* $Id: plugin_cfg.c,v 1.14 2005/05/08 04:32:44 reinelt Exp $
 *
 * 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.
 *
 *
 * $Log: plugin_cfg.c,v $
 * Revision 1.14  2005/05/08 04:32:44  reinelt
 * CodingStyle added and applied
 *
 * Revision 1.13  2005/03/30 04:57:50  reinelt
 * Evaluator speedup: use bsearch for finding functions and variables
 *
 * Revision 1.12  2005/01/18 06:30:23  reinelt
 * added (C) to all copyright statements
 *
 * Revision 1.11  2004/06/26 12:04:59  reinelt
 *
 * uh-oh... the last CVS log message messed up things a lot...
 *
 * Revision 1.10  2004/06/26 09:27:21  reinelt
 *
 * added '-W' to CFLAGS
 * changed all C++ comments to C ones
 * cleaned up a lot of signed/unsigned mistakes
 *
 * Revision 1.9  2004/06/20 10:09:56  reinelt
 *
 * 'const'ified the whole source
 *
 * 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) {
                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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