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/* $Id: plugin_w1retap.c
*
* plugin to perform simple file operations for w1retap
*
* Copyright (C) 2007 Jonathan Hudson <jh+w1retap@daria.co.uk>
* Copyright (C) 2006 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.
*
*/
/*
* This module returns a specific value associated with a key from a
* file containing one or more lines formatted as KEY=VALUE.
*
* It is intended for use with the w1retap weather station logging
* software <http://www.daria.co.uk/wx/tech.html>, but is applicable
* to any similarly formatted file.
*/
/*
* exported functions:
*
* int plugin_init_file (void)
* adds various functions
*
*/
#include "config.h"
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <ctype.h>
#include "debug.h"
#include "plugin.h"
#ifdef WITH_DMALLOC
#include <dmalloc.h>
#endif
/* function 'my_readkey' */
/* takes two arguments, file name and key */
/* returns value associated with key, trimmed to suitable dec places */
static void my_readkey(RESULT * result, RESULT * arg1, RESULT * arg2)
{
char value[80], val2[80];
FILE *fp;
char *reqkey, *pval;
size_t size;
*value = 0;
pval = value;
reqkey = R2S(arg2);
fp = fopen(R2S(arg1), "r");
if (!fp) {
error("w1retap couldn't open file '%s'", R2S(arg1));
value[0] = '\0';
} else {
size = strlen(reqkey);
while (!feof(fp) && pval == value) {
fgets(val2, sizeof(val2), fp);
if (*(val2 + size) == '=') {
if (strncmp(val2, reqkey, size) == 0) {
char *p;
p = index(val2, ' ');
if (p == NULL) {
p = index(val2, '\n');
}
if (p) {
*p = 0;
pval = val2 + size + 1;
{
double d;
char *ep;
d = strtod(pval, &ep);
if (ep != pval && (*ep == 0 || isspace(*ep))) {
if (d > 500)
sprintf(val2, "%.0f", d);
else
sprintf(val2, "%.1f", d);
pval = val2;
}
}
}
}
}
}
fclose(fp);
}
/* store result */
SetResult(&result, R_STRING, pval);
}
/* plugin initialization */
/* MUST NOT be declared 'static'! */
int plugin_init_w1retap(void)
{
/* register all our cool functions */
/* the second parameter is the number of arguments */
/* -1 stands for variable argument list */
AddFunction("w1retap::readkey", 2, my_readkey);
return 0;
}
void plugin_exit_w1retap(void)
{
/* free any allocated memory */
/* close filedescriptors */
}
/*
#Sample configuration for w1retap
#================================
Display Weather {
Driver 'Pertelian'
Port '/dev/ttyUSB0'
Size '20x4'
Backlight 1
Icons 0
}
Display XWindow {
Driver 'X11'
Size '120x32'
Font '6x8'
Pixel '4+1'
Gap '-1x-1'
Border 20
Foreground '000000ff'
Background '00000033'
Basecolor '70c000'
Buttons 6
Brightness 133
}
Widget LCDTimer {
class 'Timer'
active 1
update 10000
expression h=strftime('%H', time()); x=file::readline('/tmp/.lcd',1)+0; b=(h > 5 | h < 23) + x ; LCD::backlight(b)
}
Widget Temp {
class 'Text'
expression w1retap::readkey(file, 'OTMP0')
prefix 'Extr '
width 10
align 'L'
update tick
}
Widget GHouse {
class 'Text'
expression w1retap::readkey(file, 'GHT')
prefix 'GHT '
width 10
align 'L'
update tick
}
Widget House {
class 'Text'
expression w1retap::readkey(file, 'OTMP1')
prefix 'Intr '
width 10
align 'L'
update tick
}
Widget Garage {
class 'Text'
expression w1retap::readkey(file, 'OTMP2')
prefix 'Gge '
width 10
align 'L'
update tick
}
Widget Soil {
class 'Text'
expression w1retap::readkey(file, 'STMP1')
prefix 'Soil '
width 10
align 'L'
update tick
}
Widget Press {
class 'Text'
expression w1retap::readkey(file, 'OPRS')
prefix 'Pres '
width 10
align 'L'
update tick
}
Widget Rain {
class 'Text'
expression w1retap::readkey(file1, 'RAIN')
prefix 'Rain '
width 20
align 'L'
update tick
}
Layout Default {
Timer1 'LCDTimer'
Row1 {
Col1 'Temp'
Col11 'GHouse'
}
Row2 {
Col1 'House'
Col11 'Garage'
}
Row3 {
Col1 'Soil'
Col11 'Press'
}
Row4 {
Col1 'Rain'
}
}
Variables {
tick 120000
file '/tmp/.w1retap.dat'
file1 '/tmp/.w1rain.txt'
}
Layout 'Default'
Display 'Weather'
*/
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