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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2005 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/* Copyright (c) 1986 AT&T */
/* All Rights Reserved */
/*
* Copyright 2010 Nexenta Systems, Inc. All rights reserved.
*/
/* This module is created for NLS on Sep.03.86 */
/*
* Ungetwc saves the process code c into the one character buffer
* associated with an input stream "iop". That character, c,
* will be returned by the next getwc call on that stream.
*/
#include "lint.h"
#include "file64.h"
#include "mse_int.h"
#include <stdio.h>
#include <stdlib.h>
#include <widec.h>
#include <limits.h>
#include <errno.h>
#include "libc.h"
#include "stdiom.h"
#include "mse.h"
static wint_t
__ungetwc_impl(wint_t wc, FILE *iop, int orient)
{
char mbs[MB_LEN_MAX];
unsigned char *p;
int n;
rmutex_t *lk;
FLOCKFILE(lk, iop);
if (orient && GET_NO_MODE(iop)) {
_setorientation(iop, _WC_MODE);
}
if ((wc == WEOF) || ((iop->_flag & _IOREAD) == 0)) {
FUNLOCKFILE(lk);
return (WEOF);
}
n = wctomb(mbs, (wchar_t)wc);
if (n <= 0) {
FUNLOCKFILE(lk);
return (WEOF);
}
if (iop->_ptr <= iop->_base) {
if (iop->_base == NULL) {
FUNLOCKFILE(lk);
return (WEOF);
}
if (iop->_ptr == iop->_base && iop->_cnt == 0) {
++iop->_ptr;
} else if ((iop->_ptr - n) < (iop->_base - PUSHBACK)) {
FUNLOCKFILE(lk);
return (WEOF);
}
}
p = (unsigned char *)(mbs + n - 1);
while (n--) {
*--(iop)->_ptr = (*p--);
++(iop)->_cnt;
}
iop->_flag &= ~_IOEOF;
FUNLOCKFILE(lk);
return (wc);
}
wint_t
__ungetwc_xpg5(wint_t wc, FILE *iop)
{
return (__ungetwc_impl(wc, iop, 1));
}
wint_t
ungetwc(wint_t wc, FILE *iop)
{
return (__ungetwc_impl(wc, iop, 0));
}
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