122 lines
3.4 KiB
C
122 lines
3.4 KiB
C
/*
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* Copyright (C) 2017 Alex Yatskov <alex@foosoft.net>
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* Author: Alex Yatskov <alex@foosoft.net>
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*
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* This program 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 3 of the License, or
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* (at your option) any later version.
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*
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* This program 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, see <http://www.gnu.org/licenses/>.
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*/
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#include <iconv.h>
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#include <string.h>
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#include <errno.h>
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#include <stdlib.h>
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/*
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* Local functions
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*/
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/* https://stackoverflow.com/questions/2162390/iconv-encoding-conversion-problem */
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static char * convert (const char *from_charset, const char *to_charset, const char *input) {
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size_t inleft, outleft, converted = 0;
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char *output, *outbuf, *tmp;
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const char *inbuf;
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size_t outlen;
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iconv_t cd;
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if ((cd = iconv_open (to_charset, from_charset)) == (iconv_t) -1)
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return NULL;
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inleft = strlen (input);
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inbuf = input;
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/* we'll start off allocating an output buffer which is the same size
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* as our input buffer. */
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outlen = inleft;
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/* we allocate 4 bytes more than what we need for nul-termination... */
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if (!(output = malloc (outlen + 4))) {
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iconv_close (cd);
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return NULL;
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}
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do {
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errno = 0;
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outbuf = output + converted;
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outleft = outlen - converted;
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converted = iconv (cd, (char **) &inbuf, &inleft, &outbuf, &outleft);
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if (converted != (size_t) -1 || errno == EINVAL) {
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/*
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* EINVAL An incomplete multibyte sequence has been encoun-
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* tered in the input.
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*
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* We'll just truncate it and ignore it.
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*/
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break;
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}
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if (errno != E2BIG) {
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/*
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* EILSEQ An invalid multibyte sequence has been encountered
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* in the input.
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*
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* Bad input, we can't really recover from this.
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*/
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iconv_close (cd);
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free (output);
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return NULL;
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}
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/*
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* E2BIG There is not sufficient room at *outbuf.
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*
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* We just need to grow our outbuffer and try again.
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*/
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converted = outbuf - output;
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outlen += inleft * 2 + 8;
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if (!(tmp = realloc (output, outlen + 4))) {
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iconv_close (cd);
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free (output);
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return NULL;
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}
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output = tmp;
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outbuf = output + converted;
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} while (1);
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/* flush the iconv conversion */
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iconv (cd, NULL, NULL, &outbuf, &outleft);
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iconv_close (cd);
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/* Note: not all charsets can be nul-terminated with a single
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* nul byte. UCS2, for example, needs 2 nul bytes and UCS4
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* needs 4. I hope that 4 nul bytes is enough to terminate all
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* multibyte charsets? */
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/* nul-terminate the string */
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memset (outbuf, 0, 4);
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return output;
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}
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/*
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* Exported functions
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*/
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char* eucjp_to_utf8(const char src[]) {
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return convert("EUC-JP", "UTF-8", src);
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}
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