kolibrios/programs/develop/open watcom/trunk/clib/string/sscanf_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 sscanf_s() - safe formatted string input.
*
****************************************************************************/
#include "variety.h"
#include "saferlib.h"
#include "widechar.h"
#include <stdio.h>
#include <stdarg.h>
#include <wchar.h>
#include "scanf.h"
static int cget_string( PTR_SCNF_SPECS specs )
{
int c;
if( (c = *(specs->ptr)) != NULLCHAR ) {
++(specs->ptr);
} else {
c = EOF;
specs->eoinp = 1;
}
return( c );
}
static void uncget_string( int c, PTR_SCNF_SPECS specs )
{
--specs->ptr;
}
_WCRTLINK int __F_NAME(sscanf_s,swscanf_s)( const CHAR_TYPE *s, const CHAR_TYPE *format, ... )
{
SCNF_SPECS specs;
const char *msg;
int rc;
va_list args;
/* Basic check for null pointers to see if we can continue */
if( __check_constraint_nullptr_msg( msg, s )
&& __check_constraint_nullptr_msg( msg, format ) ) {
specs.ptr = (CHAR_TYPE *)s;
specs.cget_rtn = cget_string;
specs.uncget_rtn = uncget_string;
msg = NULL;
va_start( args, format );
rc = __F_NAME(__scnf_s,__wscnf_s)( (PTR_SCNF_SPECS)&specs, format, &msg, args );
va_end( args );
if( msg == NULL ) {
/* no rt-constraint violation inside worker routine */
return( rc );
}
}
__rtct_fail( __func__, msg, NULL );
return( __F_NAME(EOF,WEOF) );
}