123 lines
3.4 KiB
C
123 lines
3.4 KiB
C
/*
|
||
* Copyright (C) 2016 Alex Yatskov <alex@foosoft.net>
|
||
* Author: Alex Yatskov <alex@foosoft.net>
|
||
*
|
||
* This program 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 3 of the License, or
|
||
* (at your option) any later version.
|
||
*
|
||
* This program 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, see <http://www.gnu.org/licenses/>.
|
||
*/
|
||
|
||
#include <stdio.h>
|
||
#include <iconv.h>
|
||
#include <string.h>
|
||
#include <errno.h>
|
||
#include <stdlib.h>
|
||
|
||
/*
|
||
* Local functions
|
||
*/
|
||
|
||
/* https://stackoverflow.com/questions/2162390/iconv-encoding-conversion-problem */
|
||
|
||
static char * convert (const char *from_charset, const char *to_charset, const char *input) {
|
||
size_t inleft, outleft, converted = 0;
|
||
char *output, *outbuf, *tmp;
|
||
const char *inbuf;
|
||
size_t outlen;
|
||
iconv_t cd;
|
||
|
||
if ((cd = iconv_open (to_charset, from_charset)) == (iconv_t) -1)
|
||
return NULL;
|
||
|
||
inleft = strlen (input);
|
||
inbuf = input;
|
||
|
||
/* we'll start off allocating an output buffer which is the same size
|
||
* as our input buffer. */
|
||
outlen = inleft;
|
||
|
||
/* we allocate 4 bytes more than what we need for nul-termination... */
|
||
if (!(output = malloc (outlen + 4))) {
|
||
iconv_close (cd);
|
||
return NULL;
|
||
}
|
||
|
||
do {
|
||
errno = 0;
|
||
outbuf = output + converted;
|
||
outleft = outlen - converted;
|
||
|
||
converted = iconv (cd, (char **) &inbuf, &inleft, &outbuf, &outleft);
|
||
if (converted != (size_t) -1 || errno == EINVAL) {
|
||
/*
|
||
* EINVAL An incomplete multibyte sequence has been encoun-
|
||
* tered in the input.
|
||
*
|
||
* We'll just truncate it and ignore it.
|
||
*/
|
||
break;
|
||
}
|
||
|
||
if (errno != E2BIG) {
|
||
/*
|
||
* EILSEQ An invalid multibyte sequence has been encountered
|
||
* in the input.
|
||
*
|
||
* Bad input, we can't really recover from this.
|
||
*/
|
||
iconv_close (cd);
|
||
free (output);
|
||
return NULL;
|
||
}
|
||
|
||
/*
|
||
* E2BIG There is not sufficient room at *outbuf.
|
||
*
|
||
* We just need to grow our outbuffer and try again.
|
||
*/
|
||
|
||
converted = outbuf - output;
|
||
outlen += inleft * 2 + 8;
|
||
|
||
if (!(tmp = realloc (output, outlen + 4))) {
|
||
iconv_close (cd);
|
||
free (output);
|
||
return NULL;
|
||
}
|
||
|
||
output = tmp;
|
||
outbuf = output + converted;
|
||
} while (1);
|
||
|
||
/* flush the iconv conversion */
|
||
iconv (cd, NULL, NULL, &outbuf, &outleft);
|
||
iconv_close (cd);
|
||
|
||
/* Note: not all charsets can be nul-terminated with a single
|
||
* nul byte. UCS2, for example, needs 2 nul bytes and UCS4
|
||
* needs 4. I hope that 4 nul bytes is enough to terminate all
|
||
* multibyte charsets? */
|
||
|
||
/* nul-terminate the string */
|
||
memset (outbuf, 0, 4);
|
||
|
||
return output;
|
||
}
|
||
|
||
/*
|
||
* Exported functions
|
||
*/
|
||
|
||
char* eucjp_to_utf8(const char src[]) {
|
||
return convert("EUC-JP", "UTF-8", src);
|
||
}
|