kolibrios/programs/develop/open watcom/trunk/clib/memory/memmov_s.c

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/****************************************************************************
*
* Open Watcom Project
*
* Portions Copyright (c) 1983-2002 Sybase, Inc. All Rights Reserved.
*
* ========================================================================
*
* This file contains Original Code and/or Modifications of Original
* Code as defined in and that are subject to the Sybase Open Watcom
* Public License version 1.0 (the 'License'). You may not use this file
* except in compliance with the License. BY USING THIS FILE YOU AGREE TO
* ALL TERMS AND CONDITIONS OF THE LICENSE. A copy of the License is
* provided with the Original Code and Modifications, and is also
* available at www.sybase.com/developer/opensource.
*
* The Original Code and all software distributed under the License are
* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND SYBASE AND ALL CONTRIBUTORS HEREBY DISCLAIM
* ALL SUCH WARRANTIES, INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR
* NON-INFRINGEMENT. Please see the License for the specific language
* governing rights and limitations under the License.
*
* ========================================================================
*
* Description: Implementation of memmove_s() - bounds-checking memmove().
*
****************************************************************************/
#include "variety.h"
#include "saferlib.h"
#include "widechar.h"
#include <string.h>
#include <wchar.h>
#include "xstring.h"
_WCRTLINK errno_t __F_NAME(memmove_s,wmemmove_s)( VOID_WC_TYPE * __restrict s1,
rsize_t s1max,
const VOID_WC_TYPE * __restrict s2,
rsize_t n )
/*******************************************************************************/
{
errno_t rc = -1;
const char *msg;
// Verify runtime-constraints
// s1 not NULL
// s2 not NULL
// s1max <= RSIZE_MAX
// n <= RSIZE_MAX
// n <= s1max
if( __check_constraint_nullptr_msg( msg, s1 ) &&
__check_constraint_nullptr_msg( msg, s2 ) &&
__check_constraint_maxsize_msg( msg, s1max ) &&
__check_constraint_maxsize_msg( msg, n ) &&
__check_constraint_a_gt_b_msg( msg, n, s1max ) ) {
/* now it's safe to use memmove */
__F_NAME(memmove,wmemmove)( s1, s2, n );
rc = 0;
} else {
// Runtime-constraints violated, zero out destination array
if( (s1 != NULL) && __lte_rsizmax( s1max ) ) {
__F_NAME(memset,wmemset)( s1, 0, s1max );
}
// Now call the handler
__rtct_fail( __func__, msg, NULL );
}
return( rc );
}