/*-
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2013 Ed Schouten <ed@FreeBSD.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#include <sys/queue.h>
#include <assert.h>
#include <errno.h>
#include <langinfo.h>
#include <limits.h>
#include <string.h>
#include <uchar.h>
#include "../iconv/citrus_hash.h"
#include "../iconv/citrus_module.h"
#include "../iconv/citrus_iconv.h"
#include "mblocal.h"
typedef struct {
bool initialized;
struct _citrus_iconv iconv;
char srcbuf[MB_LEN_MAX];
size_t srcbuf_len;
union {
charXX_t widechar[DSTBUF_LEN];
char bytes[sizeof(charXX_t) * DSTBUF_LEN];
} dstbuf;
size_t dstbuf_len;
} _ConversionState;
_Static_assert(sizeof(_ConversionState) <= sizeof(mbstate_t),
"Size of _ConversionState must not exceed mbstate_t's size.");
size_t
mbrtocXX_l(charXX_t * __restrict pc, const char * __restrict s, size_t n,
mbstate_t * __restrict ps, locale_t locale)
{
_ConversionState *cs;
struct _citrus_iconv *handle;
size_t i, retval;
charXX_t retchar;
FIX_LOCALE(locale);
if (ps == NULL)
ps = &(XLOCALE_CTYPE(locale)->mbrtocXX);
cs = (_ConversionState *)ps;
handle = &cs->iconv;
/* Reinitialize mbstate_t. */
if (s == NULL || !cs->initialized) {
if (_citrus_iconv_open(&handle,
nl_langinfo_l(CODESET, locale), UTF_XX_INTERNAL) != 0) {
cs->initialized = false;
errno = EINVAL;
return (-1);
}
handle->cv_shared->ci_discard_ilseq = true;
handle->cv_shared->ci_hooks = NULL;
cs->srcbuf_len = cs->dstbuf_len = 0;
cs->initialized = true;
if (s == NULL)
return (0);
}
/* See if we still have characters left from the previous invocation. */
if (cs->dstbuf_len > 0) {
retval = (size_t)-3;
goto return_char;
}
/* Fill up the read buffer as far as possible. */
if (n > sizeof(cs->srcbuf) - cs->srcbuf_len)
n = sizeof(cs->srcbuf) - cs->srcbuf_len;
memcpy(cs->srcbuf + cs->srcbuf_len, s, n);
/* Convert as few characters to the dst buffer as possible. */
for (i = 0; ; i++) {
char *src, *dst;
size_t srcleft, dstleft, invlen;
int err;
src = cs->srcbuf;
srcleft = cs->srcbuf_len + n;
dst = cs->dstbuf.bytes;
dstleft = i * sizeof(charXX_t);
assert(srcleft <= sizeof(cs->srcbuf) &&
dstleft <= sizeof(cs->dstbuf.bytes));
err = _citrus_iconv_convert(handle, &src, &srcleft,
&dst, &dstleft, 0, &invlen);
cs->dstbuf_len = (dst - cs->dstbuf.bytes) / sizeof(charXX_t);
/* Got new character(s). Return the first. */
if (cs->dstbuf_len > 0) {
assert(src - cs->srcbuf > cs->srcbuf_len);
retval = src - cs->srcbuf - cs->srcbuf_len;
cs->srcbuf_len = 0;
goto return_char;
}
/* Increase dst buffer size, to obtain the surrogate pair. */
if (err == E2BIG)
continue;
/* Illegal sequence. */
if (invlen > 0) {
cs->srcbuf_len = 0;
errno = EILSEQ;
return ((size_t)-1);
}
/* Save unprocessed remainder for the next invocation. */
memmove(cs->srcbuf, src, srcleft);
cs->srcbuf_len = srcleft;
return ((size_t)-2);
}
return_char:
retchar = cs->dstbuf.widechar[0];
memmove(&cs->dstbuf.widechar[0], &cs->dstbuf.widechar[1],
--cs->dstbuf_len * sizeof(charXX_t));
if (pc != NULL)
*pc = retchar;
if (retchar == 0)
return (0);
return (retval);
}
size_t
mbrtocXX(charXX_t * __restrict pc, const char * __restrict s, size_t n,
mbstate_t * __restrict ps)
{
return (mbrtocXX_l(pc, s, n, ps, __get_locale()));
}
