mirror of
https://github.com/netfun2000/lcd4linux.git
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475fdb4397
git-svn-id: https://ssl.bulix.org/svn/lcd4linux/trunk@1136 3ae390bd-cb1e-0410-b409-cd5a39f66f1f
143 lines
3.9 KiB
C
143 lines
3.9 KiB
C
/* $Id$
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* $URL$
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*
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* iconv charset conversion plugin
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*
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* Copyright (C) 2006 Ernst Bachmann <e.bachmann@xebec.de>
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* Copyright (C) 2006 The LCD4Linux Team <lcd4linux-devel@users.sourceforge.net>
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*
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* This file is part of LCD4Linux.
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*
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* LCD4Linux is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* LCD4Linux is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*/
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/*
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* exported functions:
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*
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* int plugin_init_iconv (void)
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* int plugin_exit_iconv (void)
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*
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*/
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#include "config.h"
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#include <stdlib.h>
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#include <string.h>
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#include <ctype.h>
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#include <iconv.h>
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#include <errno.h>
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/* these should always be included */
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#include "debug.h"
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#include "plugin.h"
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#ifdef WITH_DMALLOC
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#include <dmalloc.h>
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#endif
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/* iconv function, convert charsets */
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/* valid "to" and "from" charsets can be listed by running "iconv --list" from a shell */
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/* utf16 & utf32 encodings won't work, as they contain null bytes, confusing strlen */
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static void my_iconv(RESULT * result, RESULT * charset_from, RESULT * charset_to, RESULT * arg)
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{
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char *source;
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size_t source_left;
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char *dest;
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char *dest_pos;
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size_t dest_left;
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iconv_t cd;
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source = R2S(arg);
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source_left = strlen(source);
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/* use twice the memory needed in best case, but save lots of reallocs in worst case */
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/* increase to 4 if most conversions are to utf32 (quite unlikely) */
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/* also alloc a "safety byte" so we can always zero-terminate the string. */
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dest_left = 2 * source_left;
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dest = malloc(dest_left + 1);
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dest_pos = dest;
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cd = iconv_open(R2S(charset_to), R2S(charset_from));
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if (cd != (iconv_t) (-1)) {
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do {
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/* quite spammy: debug("plugin_iconv: calling iconv with %ld,[%s]/%ld,%ld", cd, source, source_left, dest_left); */
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if (iconv(cd, &source, &source_left, &dest_pos, &dest_left) == (size_t) (-1)) {
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switch (errno) {
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case EILSEQ:
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/* illegal bytes in input sequence */
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/* try to fix by skipping a byte */
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info("plugin_iconv: illegal character in input string: %c", *source);
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source_left--;
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source++;
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break;
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case EINVAL:
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/* input string ends during a multibyte sequence */
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/* try to fix by simply ignoring */
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info("plugin_iconv: illegal character at end of input");
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source_left = 0;
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break;
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case E2BIG:
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/* not enough bytes in outbuf. */
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/* TODO: Realloc output buffer, probably doubling its size? */
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/* for now, just bail out. For lcd4linux 99% of all conversions will go to ascii or latin1 anyways */
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error
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("plugin_iconv: out of memory in destination buffer. Seems like Ernst was too lazy, complain to him!");
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source_left = 0;
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break;
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default:
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error("plugin_iconv: strange errno state (%d) occurred", errno);
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source_left = 0;
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}
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}
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} while (source_left > 0); /* don't check for == 0, could be negative in EILSEQ case */
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/* terminate the string, we're sure to have that byte left, see above */
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*dest_pos = 0;
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dest_pos++;
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iconv_close(cd);
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} else {
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error("plugin_iconv: could not open conversion descriptor. Check if your charsets are supported!");
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/* guaranteed to fit. */
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strcpy(dest, source);
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}
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SetResult(&result, R_STRING, dest);
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free(dest);
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}
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/* plugin initialization */
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int plugin_init_iconv(void)
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{
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AddFunction("iconv", 3, my_iconv);
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return 0;
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}
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void plugin_exit_iconv(void)
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{
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/* nothing to clean */
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}
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