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/* Conversion from UTF-8 to legacy encodings.
Copyright (C) 2002, 2006-2007, 2009-2024 Free Software Foundation, Inc.
This file is free software.
It is dual-licensed under "the GNU LGPLv3+ or the GNU GPLv2+".
You can redistribute it and/or modify it under either
- the terms of the GNU Lesser General Public License as published
by the Free Software Foundation, either version 3, or (at your
option) any later version, or
- 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, or
- the same dual license "the GNU LGPLv3+ or the GNU GPLv2+".
This file 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
Lesser General Public License and the GNU General Public License
for more details.
You should have received a copy of the GNU Lesser General Public
License and of the GNU General Public License along with this
program. If not, see <https://www.gnu.org/licenses/>. */
/* Written by Bruno Haible <bruno@clisp.org>. */
#include <config.h>
/* Specification. */
#include "uniconv.h"
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include "c-strcaseeq.h"
#include "striconveha.h"
#include "unistr.h"
char *
u8_conv_to_encoding (const char *tocode,
enum iconv_ilseq_handler handler,
const uint8_t *src, size_t srclen,
size_t *offsets,
char *resultbuf, size_t *lengthp)
{
if (STRCASEEQ (tocode, "UTF-8", 'U','T','F','-','8',0,0,0,0))
{
char *result;
/* Conversion from UTF-8 to UTF-8. No need to go through iconv(). */
if (u8_check (src, srclen))
{
errno = EILSEQ;
return NULL;
}
/* Memory allocation. */
if (resultbuf != NULL && *lengthp >= srclen)
result = resultbuf;
else
{
result = (char *) malloc (srclen > 0 ? srclen : 1);
if (result == NULL)
{
errno = ENOMEM;
return NULL;
}
}
if (srclen > 0)
memcpy (result, (const char *) src, srclen);
*lengthp = srclen;
return result;
}
else
{
char *result = resultbuf;
size_t length = *lengthp;
if (mem_iconveha ((const char *) src, srclen,
"UTF-8", tocode,
handler == iconveh_question_mark, handler,
offsets, &result, &length) < 0)
return NULL;
if (result == NULL) /* when (resultbuf == NULL && length == 0) */
{
result = (char *) malloc (1);
if (result == NULL)
{
errno = ENOMEM;
return NULL;
}
}
*lengthp = length;
return result;
}
}
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