/* $Id$
 * $URL$
 *
 * iconv charset conversion plugin
 *
 * Copyright (C) 2006 Ernst Bachmann <e.bachmann@xebec.de>
 * 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.
 *
 */

/* 
 * exported functions:
 *
 * int plugin_init_iconv (void)
 * int plugin_exit_iconv (void)
 *
 */


#include "config.h"

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

/* these should always be included */
#include "debug.h"
#include "plugin.h"

#ifdef WITH_DMALLOC
#include <dmalloc.h>
#endif



/* iconv function, convert charsets */
/* valid "to" and "from" charsets can be listed by running "iconv --list" from a shell */
/* utf16 & utf32 encodings won't work, as they contain null bytes, confusing strlen */
static void my_iconv(RESULT * result, RESULT * charset_from, RESULT * charset_to, RESULT * arg)
{
    char *source;
    size_t source_left;
    char *dest;
    char *dest_pos;
    size_t dest_left;
    iconv_t cd;

    source = R2S(arg);
    source_left = strlen(source);

    /* use twice the memory needed in best case, but save lots of reallocs in worst case */
    /* increase to 4 if most conversions are to utf32 (quite unlikely) */
    /* also alloc a "safety byte" so we can always zero-terminate the string. */

    dest_left = 2 * source_left;
    dest = malloc(dest_left + 1);
    dest_pos = dest;

    cd = iconv_open(R2S(charset_to), R2S(charset_from));
    if (cd != (iconv_t) (-1)) {

	do {

	    /* quite spammy: debug("plugin_iconv: calling iconv with %ld,[%s]/%ld,%ld", cd, source, source_left, dest_left); */
	    if (iconv(cd, &source, &source_left, &dest_pos, &dest_left) == (size_t) (-1)) {
		switch (errno) {
		case EILSEQ:
		    /* illegal bytes in input sequence */
		    /* try to fix by skipping a byte */
		    info("plugin_iconv: illegal character in input string: %c", *source);
		    source_left--;
		    source++;
		    break;
		case EINVAL:
		    /* input string ends during a multibyte sequence */
		    /* try to fix by simply ignoring */
		    info("plugin_iconv: illegal character at end of input");
		    source_left = 0;
		    break;
		case E2BIG:
		    /* not enough bytes in outbuf. */
		    /* TODO: Realloc output buffer, probably doubling its size? */
		    /* for now, just bail out. For lcd4linux 99% of all conversions will go to ascii or latin1 anyways */
		    error
			("plugin_iconv: out of memory in destination buffer. Seems like Ernst was too lazy, complain to him!");
		    source_left = 0;
		    break;
		default:
		    error("plugin_iconv: strange errno state (%d) occured", errno);
		    source_left = 0;
		}
	    }
	} while (source_left > 0);	/* don't check for == 0, could be negative in EILSEQ case */

	/* terminate the string, we're sure to have that byte left, see above */
	*dest_pos = 0;
	dest_pos++;

	iconv_close(cd);
    } else {
	error("plugin_iconv: could not open conversion descriptor. Check if your charsets are supported!");
	/* guaranteed to fit. */
	strcpy(dest, source);
    }

    SetResult(&result, R_STRING, dest);

    free(dest);
}


/* plugin initialization */
int plugin_init_iconv(void)
{

    AddFunction("iconv", 3, my_iconv);

    return 0;
}

void plugin_exit_iconv(void)
{
    /* nothing to clean */
}
6a85893c026&amp;follow=1'>[lcd4linux @ 2004-06-26 12:04:59 by reinelt]</a></td><td>reinelt</td><td>69</td><td><span class='deletions'>-139</span>/<span class='insertions'>+413</span></td></tr>
<tr><td><span title='2004-06-26 09:27:21 +0000'>2004-06-26</span></td><td><a href='/lcd4linux.git/commit/widget_text.h?id=1338a264d57ad5f74ce6f8283966020a8e978d2e&amp;follow=1'>[lcd4linux @ 2004-06-26 09:27:20 by reinelt]</a></td><td>reinelt</td><td>71</td><td><span class='deletions'>-1842</span>/<span class='insertions'>+2274</span></td></tr>
<tr><td><span title='2004-06-26 06:12:15 +0000'>2004-06-26</span></td><td><a href='/lcd4linux.git/commit/lcd4linux.conf.sample?id=55abb63f11967a147d26e4654cbbd7ab3f01a558&amp;follow=1'>[lcd4linux @ 2004-06-26 06:12:14 by reinelt]</a></td><td>reinelt</td><td>7</td><td><span class='deletions'>-111</span>/<span class='insertions'>+562</span></td></tr>
<tr><td><span title='2004-06-24 20:18:08 +0000'>2004-06-24</span></td><td><a href='/lcd4linux.git/commit/plugin_imon.c?id=19319129b58343f70382e6855a4c908bf669b146&amp;follow=1'>[lcd4linux @ 2004-06-24 20:18:08 by nicowallmeier]</a></td><td>nicowallmeier</td><td>1</td><td><span class='deletions'>-2</span>/<span class='insertions'>+5</span></td></tr>
<tr><td><span title='2004-06-20 10:12:27 +0000'>2004-06-20</span></td><td><a href='/lcd4linux.git/commit/ChangeLog?id=85062b1574bb15a93abfb8cad81a08d8e26438ba&amp;follow=1'>[lcd4linux @ 2004-06-20 10:12:27 by reinelt]</a></td><td>reinelt</td><td>1</td><td><span class='deletions'>-0</span>/<span class='insertions'>+110</span></td></tr>
<tr><td><span title='2004-06-20 10:09:56 +0000'>2004-06-20</span></td><td><a href='/lcd4linux.git/commit/widget_icon.c?id=7ac3e2a7d2c23ea71adeb56d8afbe1b1cbeee4df&amp;follow=1'>[lcd4linux @ 2004-06-20 10:09:52 by reinelt]</a></td><td>reinelt</td><td>51</td><td><span class='deletions'>-377</span>/<span class='insertions'>+569</span></td></tr>
<tr><td><span title='2004-06-19 08:20:19 +0000'>2004-06-19</span></td><td><a href='/lcd4linux.git/commit/drv_USBLCD.c?id=e4626159694ea6774386faa2f0d2fb517de1eb8b&amp;follow=1'>[lcd4linux @ 2004-06-19 08:20:19 by reinelt]</a></td><td>reinelt</td><td>2</td><td><span class='deletions'>-7</span>/<span class='insertions'>+17</span></td></tr>
<tr><td><span title='2004-06-17 10:58:58 +0000'>2004-06-17</span></td><td><a href='/lcd4linux.git/commit/plugin_netdev.c?id=0901696b219cd8d65b368b45712cb22b5b0b7138&amp;follow=1'>[lcd4linux @ 2004-06-17 10:58:57 by reinelt]</a></td><td>reinelt</td><td>3</td><td><span class='deletions'>-76</span>/<span class='insertions'>+84</span></td></tr>
<tr><td><span title='2004-06-17 06:23:43 +0000'>2004-06-17</span></td><td><a href='/lcd4linux.git/commit/plugin_xmms.c?id=1d354fd87d4c07906e82d104ba8614d30ae9cbbe&amp;follow=1'>[lcd4linux @ 2004-06-17 06:23:39 by reinelt]</a></td><td>reinelt</td><td>19</td><td><span class='deletions'>-403</span>/<span class='insertions'>+633</span></td></tr>
<tr><td><span title='2004-06-13 01:12:52 +0000'>2004-06-13</span></td><td><a href='/lcd4linux.git/commit/lcd4linux.conf.sample?id=e8e56418dc7375b50f36e930fb6752fbe25b4ae1&amp;follow=1'>[lcd4linux @ 2004-06-13 01:12:52 by reinelt]</a></td><td>reinelt</td><td>3</td><td><span class='deletions'>-18</span>/<span class='insertions'>+34</span></td></tr>
<tr><td><span title='2004-06-09 06:40:29 +0000'>2004-06-09</span></td><td><a href='/lcd4linux.git/commit/lcd4linux.conf.sample?id=8ac0cd282d05a3331104714aba66db9bd1715604&amp;follow=1'>[lcd4linux @ 2004-06-09 06:40:29 by reinelt]</a></td><td>reinelt</td><td>3</td><td><span class='deletions'>-11</span>/<span class='insertions'>+35</span></td></tr>
<tr><td><span title='2004-06-08 21:46:38 +0000'>2004-06-08</span></td><td><a href='/lcd4linux.git/commit/lcd4linux.conf.sample?id=382e529a22b88e5c2b438bdcee8b5a5717bc0389&amp;follow=1'>[lcd4linux @ 2004-06-08 21:46:38 by reinelt]</a></td><td>reinelt</td><td>5</td><td><span class='deletions'>-31</span>/<span class='insertions'>+131</span></td></tr>
<tr><td><span title='2004-06-08 12:35:25 +0000'>2004-06-08</span></td><td><a href='/lcd4linux.git/commit/configure.in?id=dcc21331db8a298cc58df1d5187e7d6c3802c698&amp;follow=1'>[lcd4linux @ 2004-06-08 12:35:24 by reinelt]</a></td><td>reinelt</td><td>6</td><td><span class='deletions'>-882</span>/<span class='insertions'>+474</span></td></tr>
<tr><td><span title='2004-06-07 07:02:13 +0000'>2004-06-07</span></td><td><a href='/lcd4linux.git/commit/lcd4linux.conf.sample?id=c0d32e02c2ef7a009bc236a1b333a8dd25e9029e&amp;follow=1'>[lcd4linux @ 2004-06-07 07:02:13 by reinelt]</a></td><td>reinelt</td><td>1</td><td><span class='deletions'>-0</span>/<span class='insertions'>+33</span></td></tr>
<tr><td><span title='2004-06-07 06:56:55 +0000'>2004-06-07</span></td><td><a href='/lcd4linux.git/commit/plugin_test.c?id=4c5d6736430c906cc1ed11c759793a23bfc8e962&amp;follow=1'>[lcd4linux @ 2004-06-07 06:56:55 by reinelt]</a></td><td>reinelt</td><td>5</td><td><span class='deletions'>-7</span>/<span class='insertions'>+149</span></td></tr>
<tr><td><span title='2004-06-06 06:51:59 +0000'>2004-06-06</span></td><td><a href='/lcd4linux.git/commit/lcd4linux.c?id=9839b85f87bd113c3ba39c64c3985e6fb492cb79&amp;follow=1'>[lcd4linux @ 2004-06-06 06:51:59 by reinelt]</a></td><td>reinelt</td><td>16</td><td><span class='deletions'>-52</span>/<span class='insertions'>+135</span></td></tr>
<tr><td><span title='2004-06-05 14:56:48 +0000'>2004-06-05</span></td><td><a href='/lcd4linux.git/commit/plugin_i2c_sensors.c?id=3daae37c43a92b9605220821ca62ca547fadf2b0&amp;follow=1'>[lcd4linux @ 2004-06-05 14:56:48 by reinelt]</a></td><td>reinelt</td><td>3</td><td><span class='deletions'>-24</span>/<span class='insertions'>+37</span></td></tr>
<tr><td><span title='2004-06-05 06:41:40 +0000'>2004-06-05</span></td><td><a href='/lcd4linux.git/commit/drv_generic_text.h?id=302e18d470987cee5ff6956107a5bc5fb0d582f8&amp;follow=1'>[lcd4linux @ 2004-06-05 06:41:39 by reinelt]</a></td><td>reinelt</td><td>11</td><td><span class='deletions'>-42</span>/<span class='insertions'>+87</span></td></tr>
<tr><td><span title='2004-06-05 06:13:12 +0000'>2004-06-05</span></td><td><a href='/lcd4linux.git/commit/drv_USBLCD.c?id=d8ce1d7743380929b6070ea2bb1b8fb2016f195b&amp;follow=1'>[lcd4linux @ 2004-06-05 06:13:11 by reinelt]</a></td><td>reinelt</td><td>9</td><td><span class='deletions'>-69</span>/<span class='insertions'>+327</span></td></tr>
<tr><td><span title='2004-06-02 10:09:22 +0000'>2004-06-02</span></td><td><a href='/lcd4linux.git/commit/drv_generic_text.h?id=edad39d87fae7bb48e3e4e558be6805793ec80e9&amp;follow=1'>[lcd4linux @ 2004-06-02 10:09:22 by reinelt]</a></td><td>reinelt</td><td>4</td><td><span class='deletions'>-180</span>/<span class='insertions'>+183</span></td></tr>
<tr><td><span title='2004-06-02 09:41:19 +0000'>2004-06-02</span></td><td><a href='/lcd4linux.git/commit/lcd4linux.conf.sample?id=246b8539fe86f8e6636e18b65b70da3169dfabd6&amp;follow=1'>[lcd4linux @ 2004-06-02 09:41:19 by reinelt]</a></td><td>reinelt</td><td>18</td><td><span class='deletions'>-114</span>/<span class='insertions'>+211</span></td></tr>
<tr><td><span title='2004-06-02 05:56:25 +0000'>2004-06-02</span></td><td><a href='/lcd4linux.git/commit/drv_Crystalfontz.c?id=b07a5205b19d8e46596d748af8e070bfd58949e5&amp;follow=1'>[lcd4linux @ 2004-06-02 05:56:25 by reinelt]</a></td><td>reinelt</td><td>1</td><td><span class='deletions'>-2</span>/<span class='insertions'>+6</span></td></tr>
<tr><td><span title='2004-06-02 05:35:55 +0000'>2004-06-02</span></td><td><a href='/lcd4linux.git/commit/lcd4linux.conf.sample?id=a4cd5b8283d5ae7788091f9670e0a5165fcef136&amp;follow=1'>[lcd4linux @ 2004-06-02 05:35:55 by reinelt]</a></td><td>reinelt</td><td>1</td><td><span class='deletions'>-0</span>/<span class='insertions'>+20</span></td></tr>
<tr><td><span title='2004-06-02 05:28:06 +0000'>2004-06-02</span></td><td><a href='/lcd4linux.git/commit/documentation/xsl/xhtml.xsl?id=21d19e4dbe9a3a1f724a1963d13af21004a06e55&amp;follow=1'>[lcd4linux @ 2004-06-02 05:27:59 by reinelt]</a></td><td>reinelt</td><td>26</td><td><span class='deletions'>-0</span>/<span class='insertions'>+2405</span></td></tr>
<tr><td><span title='2004-06-02 05:14:16 +0000'>2004-06-02</span></td><td><a href='/lcd4linux.git/commit/lcd4linux.c?id=491dc3d0e3ff77223118aac4712bf9ed2dac63a8&amp;follow=1'>[lcd4linux @ 2004-06-02 05:14:16 by reinelt]</a></td><td>reinelt</td><td>2</td><td><span class='deletions'>-17</span>/<span class='insertions'>+31</span></td></tr>
<tr><td><span title='2004-06-01 06:45:30 +0000'>2004-06-01</span></td><td><a href='/lcd4linux.git/commit/timer.h?id=8dc94dba6511b8db40c0e209b0ea595052650a21&amp;follow=1'>[lcd4linux @ 2004-06-01 06:45:28 by reinelt]</a></td><td>reinelt</td><td>18</td><td><span class='deletions'>-71</span>/<span class='insertions'>+241</span></td></tr>
<tr><td><span title='2004-06-01 06:04:25 +0000'>2004-06-01</span></td><td><a href='/lcd4linux.git/commit/plugin_sample.c?id=a581675c3951031bdc1b71fa654d0dadcc191397&amp;follow=1'>[lcd4linux @ 2004-06-01 06:04:25 by reinelt]</a></td><td>reinelt</td><td>2</td><td><span class='deletions'>-25</span>/<span class='insertions'>+25</span></td></tr>
<tr><td><span title='2004-05-31 21:23:16 +0000'>2004-05-31</span></td><td><a href='/lcd4linux.git/commit/drv_MatrixOrbital.c?id=07afe02801bd274932a1dccdbe0ed27e782a5c80&amp;follow=1'>[lcd4linux @ 2004-05-31 21:23:16 by reinelt]</a></td><td>reinelt</td><td>1</td><td><span class='deletions'>-37</span>/<span class='insertions'>+49</span></td></tr>
<tr><td><span title='2004-05-31 21:05:13 +0000'>2004-05-31</span></td><td><a href='/lcd4linux.git/commit/plugin_pop3.c?id=10ff23f9cdef25d4140e6c802c373aaf48270fee&amp;follow=1'>[lcd4linux @ 2004-05-31 21:05:13 by reinelt]</a></td><td>reinelt</td><td>5</td><td><span class='deletions'>-77</span>/<span class='insertions'>+111</span></td></tr>
<tr><td><span title='2004-05-31 16:39:06 +0000'>2004-05-31</span></td><td><a href='/lcd4linux.git/commit/hash.c?id=4e1eaa7205d8b7fbc64dc685d864b385a25602be&amp;follow=1'>[lcd4linux @ 2004-05-31 16:39:05 by reinelt]</a></td><td>reinelt</td><td>11</td><td><span class='deletions'>-180</span>/<span class='insertions'>+535</span></td></tr>
<tr><td><span title='2004-05-31 06:27:34 +0000'>2004-05-31</span></td><td><a href='/lcd4linux.git/commit/ChangeLog?id=61bd7f7bf2cef22b8d867ad7b168e4422ffd94f6&amp;follow=1'>[lcd4linux @ 2004-05-31 06:27:34 by reinelt]</a></td><td>reinelt</td><td>1</td><td><span class='deletions'>-0</span>/<span class='insertions'>+40</span></td></tr>
<tr><td><span title='2004-05-31 06:24:42 +0000'>2004-05-31</span></td><td><a href='/lcd4linux.git/commit/lcd4linux.conf.sample?id=a53d8337c13f485875cad24edf74b0287b37600b&amp;follow=1'>[lcd4linux @ 2004-05-31 06:24:42 by reinelt]</a></td><td>reinelt</td><td>2</td><td><span class='deletions'>-7</span>/<span class='insertions'>+29</span></td></tr>
<tr><td><span title='2004-05-31 05:38:02 +0000'>2004-05-31</span></td><td><a href='/lcd4linux.git/commit/drv_USBLCD.c?id=ea5453f570c5186379745a10054280f47a809299&amp;follow=1'>[lcd4linux @ 2004-05-31 05:38:02 by reinelt]</a></td><td>reinelt</td><td>8</td><td><span class='deletions'>-42</span>/<span class='insertions'>+94</span></td></tr>
<tr><td><span title='2004-05-31 01:31:01 +0000'>2004-05-31</span></td><td><a href='/lcd4linux.git/commit/drv_MilfordInstruments.c?id=0bda5dcd7faa2198fe972aa85b8c72cb0b666554&amp;follow=1'>[lcd4linux @ 2004-05-31 01:31:01 by andy-b]</a></td><td>andy-b</td><td>1</td><td><span class='deletions'>-10</span>/<span class='insertions'>+12</span></td></tr>
<tr><td><span title='2004-05-30 08:25:50 +0000'>2004-05-30</span></td><td><a href='/lcd4linux.git/commit/lcd4linux.conf.sample?id=f40bd8007746a5a012f01cd58b4f0f94a36709b3&amp;follow=1'>[lcd4linux @ 2004-05-30 08:25:50 by reinelt]</a></td><td>reinelt</td><td>2</td><td><span class='deletions'>-30</span>/<span class='insertions'>+92</span></td></tr>
<tr><td><span title='2004-05-29 23:30:20 +0000'>2004-05-29</span></td><td><a href='/lcd4linux.git/commit/drv_Image.c?id=f6aa208883850f97d72813b281b106ca184d94f7&amp;follow=1'>[lcd4linux @ 2004-05-29 23:30:20 by reinelt]</a></td><td>reinelt</td><td>1</td><td><span class='deletions'>-1</span>/<span class='insertions'>+9</span></td></tr>
<tr><td><span title='2004-05-29 15:53:28 +0000'>2004-05-29</span></td><td><a href='/lcd4linux.git/commit/plugin_ppp.c?id=c17304852de34a6be81d931923dd9e21c637ba95&amp;follow=1'>[lcd4linux @ 2004-05-29 15:53:28 by reinelt]</a></td><td>reinelt</td><td>3</td><td><span class='deletions'>-9</span>/<span class='insertions'>+25</span></td></tr>
<tr><td><span title='2004-05-29 01:07:56 +0000'>2004-05-29</span></td><td><a href='/lcd4linux.git/commit/plugin_diskstats.c?id=927530dfa14e1d35abd5a564a730f4fcf598a416&amp;follow=1'>[lcd4linux @ 2004-05-29 01:07:56 by reinelt]</a></td><td>reinelt</td><td>2</td><td><span class='deletions'>-21</span>/<span class='insertions'>+25</span></td></tr>
<tr><td><span title='2004-05-29 00:27:23 +0000'>2004-05-29</span></td><td><a href='/lcd4linux.git/commit/plugins.m4?id=4749def80d9a775c8d0791fe322322f5d1425c95&amp;follow=1'>[lcd4linux @ 2004-05-29 00:27:14 by reinelt]</a></td><td>reinelt</td><td>8</td><td><span class='deletions'>-11</span>/<span class='insertions'>+214</span></td></tr>
<tr><td><span title='2004-05-28 14:38:10 +0000'>2004-05-28</span></td><td><a href='/lcd4linux.git/commit/Status?id=ba5326cf8e6dd8051efadde4528e3aeb6e654fb2&amp;follow=1'>[lcd4linux @ 2004-05-28 14:38:10 by reinelt]</a></td><td>reinelt</td><td>2</td><td><span class='deletions'>-1</span>/<span class='insertions'>+41</span></td></tr>