/* $Id$
 * $URL$
 *
 * plugin for /proc/meminfo parsing
 *
 * Copyright (C) 2003 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_meminfo (void)
 *  adds functions to access /proc/meminfo
 *
 */


#include "config.h"

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

#include "debug.h"
#include "plugin.h"

#include "hash.h"


static HASH MemInfo;
static FILE *stream = NULL;

static int parse_meminfo(void)
{
    int age;

    /* reread every 10 msec only */
    age = hash_age(&MemInfo, NULL);
    if (age > 0 && age <= 10)
	return 0;

    if (stream == NULL)
	stream = fopen("/proc/meminfo", "r");
    if (stream == NULL) {
	error("fopen(/proc/meminfo) failed: %s", strerror(errno));
	return -1;
    }

    rewind(stream);
    while (!feof(stream)) {
	char buffer[256];
	char *c, *key, *val;
	fgets(buffer, sizeof(buffer), stream);
	c = strchr(buffer, ':');
	if (c == NULL)
	    continue;
	key = buffer;
	val = c + 1;
	/* strip leading blanks from key */
	while (isspace(*key))
	    *key++ = '\0';
	/* strip trailing blanks from key */
	do
	    *c = '\0';
	while (isspace(*--c));
	/* strip leading blanks from value */
	while (isspace(*val))
	    *val++ = '\0';
	/* strip trailing blanks from value */
	for (c = val; *c != '\0'; c++);
	while (isspace(*--c))
	    *c = '\0';
	/* skip lines that do not end with " kB" */
	if (*c == 'B' && *(c - 1) == 'k' && *(c - 2) == ' ') {
	    /* strip trailing " kB" from value */
	    *(c - 2) = '\0';
	    /* add entry to hash table */
	    hash_put(&MemInfo, key, val);
	}
    }
    return 0;
}

static void my_meminfo(RESULT * result, RESULT * arg1)
{
    char *key, *val;

    if (parse_meminfo() < 0) {
	SetResult(&result, R_STRING, "");
	return;
    }

    key = R2S(arg1);
    val = hash_get(&MemInfo, key, NULL);
    if (val == NULL)
	val = "";

    SetResult(&result, R_STRING, val);
}


int plugin_init_meminfo(void)
{
    hash_create(&MemInfo);
    AddFunction("meminfo", 1, my_meminfo);
    return 0;
}


void plugin_exit_meminfo(void)
{
    if (stream != NULL) {
	fclose(stream);
	stream = NULL;
    }
    hash_destroy(&MemInfo);
}
4&amp;follow=1'>minor updates</a></td><td>michux</td><td>1</td><td><span class='deletions'>-2</span>/<span class='insertions'>+8</span></td></tr>
<tr><td><span title='2008-01-28 17:03:27 +0000'>2008-01-28</span></td><td><a href='/lcd4linux.git/commit/widget_text.h?id=2e6a20b9a8a2bc2f3c2023d0cd750b6e198ba743&amp;follow=1'>added pingpong scrolling</a></td><td>michux</td><td>2</td><td><span class='deletions'>-5</span>/<span class='insertions'>+53</span></td></tr>
<tr><td><span title='2008-01-24 12:39:55 +0000'>2008-01-24</span></td><td><a href='/lcd4linux.git/commit/plugin_mpd.c?id=64fa72b0547217afe553718f7e2ac7abe6f55495&amp;follow=1'>git-svn-id: https://ssl.bulix.org/svn/lcd4linux/trunk@848 3ae390bd-cb1e-0410-...</a></td><td>michux</td><td>1</td><td><span class='deletions'>-312</span>/<span class='insertions'>+402</span></td></tr>
<tr><td><span title='2007-10-03 05:12:11 +0000'>2007-10-03</span></td><td><a href='/lcd4linux.git/commit/widget_text.h?id=40bde26bc2c197093e512f8d5d83e5aeb66cbbbf&amp;follow=1'>automatic marquee patch from Manuel Grot</a></td><td>michael</td><td>2</td><td><span class='deletions'>-5</span>/<span class='insertions'>+13</span></td></tr>
<tr><td><span title='2007-10-01 15:49:21 +0000'>2007-10-01</span></td><td><a href='/lcd4linux.git/commit/udelay.c?id=b4295fcc844e053df526da8498c4c09501824543&amp;follow=1'>RDTSC delay and inclusion of asm/msr.h removed</a></td><td>michael</td><td>5</td><td><span class='deletions'>-258</span>/<span class='insertions'>+14</span></td></tr>
<tr><td><span title='2007-10-01 15:04:49 +0000'>2007-10-01</span></td><td><a href='/lcd4linux.git/commit/smoketest.sh?id=354b411f9ddf943fe35b380f11d52bd6201df131&amp;follow=1'>driver for Pertelian display by Andy Powell</a></td><td>michael</td><td>8</td><td><span class='deletions'>-16</span>/<span class='insertions'>+387</span></td></tr>
<tr><td><span title='2007-09-15 06:10:48 +0000'>2007-09-15</span></td><td><a href='/lcd4linux.git/commit/plugin_gps.c?id=2dfe05bcccd321f4907cf976edceb409c27f2677&amp;follow=1'>GPS plugin V0.3 by michu</a></td><td>michael</td><td>1</td><td><span class='deletions'>-40</span>/<span class='insertions'>+143</span></td></tr>
<tr><td><span title='2007-09-15 06:06:21 +0000'>2007-09-15</span></td><td><a href='/lcd4linux.git/commit/plugin_gps.c?id=1d0eeaa9ab90296f7887c579adbeb2fc9fa2d0db&amp;follow=1'>GPS plugin V0.2 by michu</a></td><td>michael</td><td>1</td><td><span class='deletions'>-69</span>/<span class='insertions'>+267</span></td></tr>
<tr><td><span title='2007-09-09 12:17:42 +0000'>2007-09-09</span></td><td><a href='/lcd4linux.git/commit/widget_timer.h?id=6d5d1055eae7db6d459c3a16ada11ca013e70363&amp;follow=1'>email address changed</a></td><td>michael</td><td>107</td><td><span class='deletions'>-109</span>/<span class='insertions'>+109</span></td></tr>
<tr><td><span title='2007-07-27 10:10:41 +0000'>2007-07-27</span></td><td><a href='/lcd4linux.git/commit/udelay.c?id=51bbebac48030fcc624e090fee24b368b8197f08&amp;follow=1'>Fix compilation with kernel 2.6.22 by Guillaume LECERF</a></td><td>michael</td><td>1</td><td><span class='deletions'>-1</span>/<span class='insertions'>+4</span></td></tr>
<tr><td><span title='2007-07-27 10:01:17 +0000'>2007-07-27</span></td><td><a href='/lcd4linux.git/commit/plugin_mpd.c?id=1c822162c25c02121b89f0b226e38c6b1e7d207b&amp;follow=1'>MPD plugin patch from michu</a></td><td>michael</td><td>1</td><td><span class='deletions'>-1</span>/<span class='insertions'>+22</span></td></tr>
<tr><td><span title='2007-07-27 09:25:16 +0000'>2007-07-27</span></td><td><a href='/lcd4linux.git/commit/plugin_gps.c?id=63194435c3760ea232a3dcb75c7f843e8b1a9055&amp;follow=1'>GPS plugin update by michu</a></td><td>michael</td><td>1</td><td><span class='deletions'>-131</span>/<span class='insertions'>+248</span></td></tr>
<tr><td><span title='2007-07-27 09:24:25 +0000'>2007-07-27</span></td><td><a href='/lcd4linux.git/commit/drv_generic_graphic.h?id=91c4a099a9da2136687256019a0940155d339277&amp;follow=1'>indentation</a></td><td>michael</td><td>2</td><td><span class='deletions'>-106</span>/<span class='insertions'>+108</span></td></tr>
<tr><td><span title='2007-06-21 22:13:40 +0000'>2007-06-21</span></td><td><a href='/lcd4linux.git/commit/drv_X11.c?id=e849821bad784c38a550953174da83d00a8ee549&amp;follow=1'>default for Brightness is 255</a></td><td>volker</td><td>1</td><td><span class='deletions'>-1</span>/<span class='insertions'>+1</span></td></tr>
<tr><td><span title='2007-06-20 15:03:41 +0000'>2007-06-20</span></td><td><a href='/lcd4linux.git/commit/drv_X11.c?id=4e604a94f3872b465d51a124f832e3d295fc1772&amp;follow=1'>LCD::brightness in drv_X11 corrected</a></td><td>volker</td><td>1</td><td><span class='deletions'>-2</span>/<span class='insertions'>+10</span></td></tr>
<tr><td><span title='2007-06-20 13:47:24 +0000'>2007-06-20</span></td><td><a href='/lcd4linux.git/commit/drv_generic_graphic.h?id=f2004be68776eaf223a4cba5a0b7e45cc5a72624&amp;follow=1'>global variable for backlight color</a></td><td>volker</td><td>1</td><td><span class='deletions'>-0</span>/<span class='insertions'>+1</span></td></tr>
<tr><td><span title='2007-06-20 13:44:30 +0000'>2007-06-20</span></td><td><a href='/lcd4linux.git/commit/drv_X11.c?id=fdf19a1a522ce857a7ef1f12c8628e087d424b93&amp;follow=1'>keypad support completed; new property brightness implemented</a></td><td>volker</td><td>1</td><td><span class='deletions'>-40</span>/<span class='insertions'>+175</span></td></tr>
<tr><td><span title='2007-06-20 13:41:42 +0000'>2007-06-20</span></td><td><a href='/lcd4linux.git/commit/drv_Cwlinux.c?id=a67cbe4975c81ecab2d1e2ed087d410534439c00&amp;follow=1'>maximum value for brightness is 8</a></td><td>volker</td><td>1</td><td><span class='deletions'>-2</span>/<span class='insertions'>+2</span></td></tr>
<tr><td><span title='2007-06-17 06:10:11 +0000'>2007-06-17</span></td><td><a href='/lcd4linux.git/commit/drv_X11.c?id=0802e1b84e35ccd55158189fe0d892fd9dfdbf07&amp;follow=1'>buttons for X11 driver (thanks to Volker Gering)</a></td><td>michael</td><td>1</td><td><span class='deletions'>-8</span>/<span class='insertions'>+49</span></td></tr>
<tr><td><span title='2007-06-17 06:08:00 +0000'>2007-06-17</span></td><td><a href='/lcd4linux.git/commit/plugin_uname.c?id=d3c68fc20d892252aa243d2e697386ec54065142&amp;follow=1'>Apple has no utsbuf.domainname (thanks to Volker Gering)</a></td><td>michael</td><td>1</td><td><span class='deletions'>-1</span>/<span class='insertions'>+1</span></td></tr>
<tr><td><span title='2007-06-17 06:06:19 +0000'>2007-06-17</span></td><td><a href='/lcd4linux.git/commit/evaluator.c?id=2fcc2950e43cba7cd677057cde39c2766848616f&amp;follow=1'>strndup() replacement</a></td><td>michael</td><td>1</td><td><span class='deletions'>-0</span>/<span class='insertions'>+24</span></td></tr>
<tr><td><span title='2007-06-17 05:51:15 +0000'>2007-06-17</span></td><td><a href='/lcd4linux.git/commit/lcd4linux.c?id=d6c3787acf186f58e3fda571e77f73bea7324f40&amp;follow=1'>better usage output by Volker Gering</a></td><td>michael</td><td>1</td><td><span class='deletions'>-4</span>/<span class='insertions'>+20</span></td></tr>
<tr><td><span title='2007-06-08 04:45:16 +0000'>2007-06-08</span></td><td><a href='/lcd4linux.git/commit/drv_Image.c?id=684bc9f48bbd560618bb2c07f5482d28d1519644&amp;follow=1'>Image driver libgd dependancy fix</a></td><td>michael</td><td>5</td><td><span class='deletions'>-6</span>/<span class='insertions'>+31</span></td></tr>
<tr><td><span title='2007-06-04 04:11:31 +0000'>2007-06-04</span></td><td><a href='/lcd4linux.git/commit/plugin_mpd.c?id=775475883e63c7486c3ec043d10f62502cf40826&amp;follow=1'>big MPD patch from Robert Buchholz</a></td><td>michael</td><td>1</td><td><span class='deletions'>-79</span>/<span class='insertions'>+86</span></td></tr>
<tr><td><span title='2007-05-19 11:43:32 +0000'>2007-05-19</span></td><td><a href='/lcd4linux.git/commit/plugins.m4?id=cbde4d3f9281906feb5e051e6fa74ab065bd77c0&amp;follow=1'>gps plugin, code by michu / www.neophob.com</a></td><td>michael</td><td>7</td><td><span class='deletions'>-0</span>/<span class='insertions'>+580</span></td></tr>
<tr><td><span title='2007-05-17 05:23:46 +0000'>2007-05-17</span></td><td><a href='/lcd4linux.git/commit/drivers.m4?id=93d751a7c3d5c6c1db576460a7f08bd80a0f3bb9&amp;follow=1'>compile error on m68k fixed (debian bug 405898)</a></td><td>michael</td><td>3</td><td><span class='deletions'>-10</span>/<span class='insertions'>+170</span></td></tr>
<tr><td><span title='2007-05-04 11:35:52 +0000'>2007-05-04</span></td><td><a href='/lcd4linux.git/commit/drv_LUIse.c?id=db6911f350d69aa5fe72254c3104b5e8e3082b32&amp;follow=1'>typo in LUIse driver fixed</a></td><td>michael</td><td>1</td><td><span class='deletions'>-1</span>/<span class='insertions'>+1</span></td></tr>
<tr><td><span title='2007-05-02 05:10:55 +0000'>2007-05-02</span></td><td><a href='/lcd4linux.git/commit/plugin_mpd.c?id=c909270be37026e4877acf556af0556f7d1356c6&amp;follow=1'>some compiler warnings fixed</a></td><td>michael</td><td>6</td><td><span class='deletions'>-8</span>/<span class='insertions'>+14</span></td></tr>
<tr><td><span title='2007-04-30 05:32:03 +0000'>2007-04-30</span></td><td><a href='/lcd4linux.git/commit/svn_version.h?id=b8b8a6a2cf8726a86bc2ba58fc502ce5a4ac2b1d&amp;follow=1'>LCD4Linux-0.10.1-RC2</a></td><td>michael</td><td>1</td><td><span class='deletions'>-1</span>/<span class='insertions'>+1</span></td></tr>
<tr><td><span title='2007-04-30 05:29:22 +0000'>2007-04-30</span></td><td><a href='/lcd4linux.git/commit/ChangeLog?id=416c593124a6b66e3c6c2c5615a7d3a6d1438897&amp;follow=1'>ChangeLog updated</a></td><td>michael</td><td>1</td><td><span class='deletions'>-1782</span>/<span class='insertions'>+3099</span></td></tr>
<tr><td><span title='2007-04-30 05:25:46 +0000'>2007-04-30</span></td><td><a href='/lcd4linux.git/commit/svn2cl.sh?id=059c8eb1711ededdb8a8984b688811530b2e9f58&amp;follow=1'>svn2cl moved and optimized</a></td><td>michael</td><td>1</td><td><span class='deletions'>-6</span>/<span class='insertions'>+0</span></td></tr>