diff options
Diffstat (limited to 'plugin_iconv.c')
| -rw-r--r-- | plugin_iconv.c | 142 |
1 files changed, 142 insertions, 0 deletions
diff --git a/plugin_iconv.c b/plugin_iconv.c new file mode 100644 index 0000000..6d5a8a6 --- /dev/null +++ b/plugin_iconv.c @@ -0,0 +1,142 @@ +/* $Id: plugin_iconv.c 1136 2010-11-28 16:07:16Z mzuther $ + * $URL: https://ssl.bulix.org/svn/lcd4linux/trunk/plugin_iconv.c $ + * + * 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) occurred", 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 */ +} |