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/* Copyright (C) 1996-2024 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library 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 for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <assert.h>
#include <dlfcn.h>
#include <errno.h>
#include <gconv.h>
#include <wchar.h>
#include <wcsmbsload.h>
#include <pointer_guard.h>
#ifndef EILSEQ
# define EILSEQ EINVAL
#endif
/* This is the private state used if PS is NULL. */
static mbstate_t state;
/* This is a non-standard function but it is very useful in the
implementation of stdio because we have to deal with unterminated
buffers. At most NWC wide character will be converted. */
size_t
__wcsnrtombs (char *dst, const wchar_t **src, size_t nwc, size_t len,
mbstate_t *ps)
{
struct __gconv_step_data data;
const wchar_t *srcend;
int status;
size_t result;
struct __gconv_step *tomb;
const struct gconv_fcts *fcts;
/* Tell where we want the result. */
data.__invocation_counter = 0;
data.__internal_use = 1;
data.__flags = __GCONV_IS_LAST;
data.__statep = ps ?: &state;
if (nwc == 0)
return 0;
srcend = *src + __wcsnlen (*src, nwc - 1) + 1;
/* Get the conversion functions. */
fcts = get_gconv_fcts (_NL_CURRENT_DATA (LC_CTYPE));
/* Get the structure with the function pointers. */
tomb = fcts->tomb;
__gconv_fct fct = tomb->__fct;
if (tomb->__shlib_handle != NULL)
PTR_DEMANGLE (fct);
/* We have to handle DST == NULL special. */
if (dst == NULL)
{
mbstate_t temp_state;
unsigned char buf[256]; /* Just an arbitrary value. */
const unsigned char *inbuf = (const unsigned char *) *src;
size_t dummy;
temp_state = *data.__statep;
data.__statep = &temp_state;
result = 0;
data.__outbufend = buf + sizeof (buf);
do
{
data.__outbuf = buf;
status = DL_CALL_FCT (fct, (tomb, &data, &inbuf,
(const unsigned char *) srcend, NULL,
&dummy, 0, 1));
/* Count the number of bytes. */
result += data.__outbuf - buf;
}
while (status == __GCONV_FULL_OUTPUT);
if ((status == __GCONV_OK || status == __GCONV_EMPTY_INPUT)
&& data.__outbuf[-1] == '\0')
/* Don't count the NUL character in. */
--result;
}
else
{
/* This code is based on the safe assumption that all internal
multi-byte encodings use the NUL byte only to mark the end
of the string. */
size_t dummy;
data.__outbuf = (unsigned char *) dst;
data.__outbufend = (unsigned char *) dst + len;
status = DL_CALL_FCT (fct, (tomb, &data, (const unsigned char **) src,
(const unsigned char *) srcend, NULL,
&dummy, 0, 1));
/* Count the number of bytes. */
result = data.__outbuf - (unsigned char *) dst;
/* We have to determine whether the last character converted
is the NUL character. */
if ((status == __GCONV_OK || status == __GCONV_EMPTY_INPUT)
&& data.__outbuf[-1] == '\0')
{
assert (data.__outbuf != (unsigned char *) dst);
assert (__mbsinit (data.__statep));
*src = NULL;
--result;
}
}
/* There must not be any problems with the conversion but illegal input
characters. */
assert (status == __GCONV_OK || status == __GCONV_EMPTY_INPUT
|| status == __GCONV_ILLEGAL_INPUT
|| status == __GCONV_INCOMPLETE_INPUT
|| status == __GCONV_FULL_OUTPUT);
if (status != __GCONV_OK && status != __GCONV_FULL_OUTPUT
&& status != __GCONV_EMPTY_INPUT)
{
result = (size_t) -1;
__set_errno (EILSEQ);
}
return result;
}
weak_alias (__wcsnrtombs, wcsnrtombs)
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