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/* Copyright (C) 1996, 1997, 1998, 1999 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@gnu.org>, 1996.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include <errno.h>
#include <gconv.h>
#include <string.h>
#include <wchar.h>
#include <wcsmbsload.h>
#include <assert.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 NMC bytes will be converted. */
size_t
__mbsnrtowcs (dst, src, nmc, len, ps)
wchar_t *dst;
const char **src;
size_t nmc;
size_t len;
mbstate_t *ps;
{
const unsigned char *srcend;
struct gconv_step_data data;
size_t result = 0;
int status;
/* Tell where we want the result. */
data.invocation_counter = 0;
data.internal_use = 1;
data.is_last = 1;
data.statep = ps ?: &state;
if (nmc == 0)
return 0;
srcend = *src + __strnlen (*src, nmc - 1) + 1;
/* Make sure we use the correct function. */
update_conversion_ptrs ();
/* We have to handle DST == NULL special. */
if (dst == NULL)
{
wchar_t buf[64]; /* Just an arbitrary size. */
const unsigned char *inbuf = *src;
data.outbufend = (char *) buf + sizeof (buf);
do
{
data.outbuf = (char *) buf;
status = (*__wcsmbs_gconv_fcts.towc->fct) (__wcsmbs_gconv_fcts.towc,
&data, &inbuf, srcend,
&result, 0);
}
while (status == GCONV_FULL_OUTPUT);
if ((status == GCONV_OK || status == GCONV_EMPTY_INPUT)
&& ((wchar_t *) data.outbuf)[-1] == L'\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. */
data.outbuf = (unsigned char *) dst;
data.outbufend = data.outbuf + len * sizeof (wchar_t);
status = (*__wcsmbs_gconv_fcts.towc->fct) (__wcsmbs_gconv_fcts.towc,
&data,
(const unsigned char **) src,
srcend, &result, 0);
/* We have to determine whether the last character converted
is the NUL character. */
if ((status == GCONV_OK || status == GCONV_EMPTY_INPUT)
&& ((wchar_t *) dst)[result - 1] == L'\0')
{
assert (result > 0);
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 (__mbsnrtowcs, mbsnrtowcs)
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