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/* Copyright (C) 1996, 1997, 1998 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@gnu.ai.mit.edu>, 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 <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;
size_t
__mbrtowc (wchar_t *pwc, const char *s, size_t n, mbstate_t *ps)
{
wchar_t buf[1];
struct gconv_step_data data;
size_t inbytes;
int status;
size_t result;
/* Tell where we want the result. */
data.outbuf = (char *) (pwc ?: buf);
data.outbufavail = 0;
data.outbufsize = sizeof (wchar_t);
data.is_last = 1;
data.statep = ps ?: &state;
/* A first special case is if S is NULL. This means put PS in the
initial state. */
if (s == NULL)
{
data.outbuf = (char *) buf;
s = "";
n = 1;
}
/* Make sure we use the correct function. */
update_conversion_ptrs ();
/* Do a normal conversion. */
inbytes = n;
status = (*__wcsmbs_gconv_fcts.towc->fct) (__wcsmbs_gconv_fcts.towc,
&data, s, &inbytes, NULL, 0);
/* There must not be any problems with the conversion but illegal input
characters. The output buffer must be large enough, otherwise the
definition of MB_CUR_MAX is not correct. All the other possible
errors also must not happen. */
assert (status == GCONV_OK || status == GCONV_ILLEGAL_INPUT
|| status == GCONV_INCOMPLETE_INPUT);
if (status == GCONV_OK)
{
if (*(wchar_t *)data.outbuf == L'\0')
{
/* The converted character is the NUL character. */
assert (mbsinit (data.statep));
result = 0;
}
else
result = n - inbytes;
}
else
{
result = status == GCONV_INCOMPLETE_INPUT ? (size_t) -2 : (size_t) -1;
__set_errno (EILSEQ);
}
return result;
}
weak_alias (__mbrtowc, mbrtowc)
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