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/*
* Copyright 2008-2013 Various Authors
* Copyright 2004 Timo Hirvonen
*
* 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 2 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 "convert.h"
#include "xmalloc.h"
#include "uchar.h"
#ifdef HAVE_CONFIG
#include "config/iconv.h"
#endif
#ifdef HAVE_ICONV
#include <iconv.h>
#endif
#include <string.h>
#include <errno.h>
ssize_t convert(const char *inbuf, ssize_t inbuf_size,
char **outbuf, ssize_t outbuf_estimate,
const char *tocode, const char *fromcode)
{
#ifdef HAVE_ICONV
const char *in;
char *out;
size_t rc, outbuf_size, inbytesleft, outbytesleft;
iconv_t cd;
int finished = 0, err_save;
cd = iconv_open(tocode, fromcode);
if (cd == (iconv_t) -1)
return -1;
if (inbuf_size < 0)
inbuf_size = strlen(inbuf);
inbytesleft = inbuf_size;
if (outbuf_estimate < 0)
outbuf_size = inbuf_size;
else
outbuf_size = outbuf_estimate;
outbytesleft = outbuf_size;
in = inbuf;
out = *outbuf = xnew(char, outbuf_size + 1);
while (!finished) {
finished = 1;
rc = iconv(cd, (char **)&in, &inbytesleft, &out, &outbytesleft);
if (rc == (size_t) -1) {
if (errno == E2BIG) {
size_t used = out - *outbuf;
outbytesleft += outbuf_size;
outbuf_size *= 2;
*outbuf = xrenew(char, *outbuf, outbuf_size + 1);
out = *outbuf + used;
continue;
} else if (errno != EINVAL)
goto error;
}
}
/* NUL-terminate for safety reasons */
*out = '\0';
iconv_close(cd);
return outbuf_size - outbytesleft;
error:
err_save = errno;
free(*outbuf);
*outbuf = NULL;
iconv_close(cd);
errno = err_save;
return -1;
#else
if (inbuf_size < 0)
inbuf_size = strlen(inbuf);
*outbuf = xnew(char, inbuf_size + 1);
memcpy(*outbuf, inbuf, inbuf_size);
(*outbuf)[inbuf_size] = '\0';
return inbuf_size;
#endif
}
int utf8_encode(const char *inbuf, const char *encoding, char **outbuf)
{
size_t inbuf_size, outbuf_size, i;
int rc;
inbuf_size = strlen(inbuf);
outbuf_size = inbuf_size;
for (i = 0; i < inbuf_size; i++) {
unsigned char ch;
ch = inbuf[i];
if (ch > 127)
outbuf_size++;
}
rc = convert(inbuf, inbuf_size, outbuf, outbuf_size, "UTF-8", encoding);
return rc < 0 ? -1 : 0;
}
char *to_utf8(const char *str, const char *enc)
{
char *outbuf = NULL;
int rc;
if (u_is_valid(str)) {
return xstrdup(str);
} else {
rc = utf8_encode(str, enc, &outbuf);
return rc < 0 ? xstrdup(str) : outbuf;
}
}
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