forked from KolibriOS/kolibrios
101 lines
3.5 KiB
C
101 lines
3.5 KiB
C
|
/****************************************************************************
|
||
|
|
*
|
||
|
|
* 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 snprintf_s() - safe string fmt'd output.
|
||
|
|
*
|
||
|
|
****************************************************************************/
|
||
|
|
|
||
|
|
|
||
|
|
#include "variety.h"
|
||
|
|
#include "saferlib.h"
|
||
|
|
#include "widechar.h"
|
||
|
|
#include <stdio.h>
|
||
|
|
#include <stdarg.h>
|
||
|
|
#include <wchar.h>
|
||
|
|
#include "printf.h"
|
||
|
|
|
||
|
|
|
||
|
|
struct buf_limit {
|
||
|
|
CHAR_TYPE *bufptr;
|
||
|
|
rsize_t chars_output;
|
||
|
|
rsize_t max_chars;
|
||
|
|
};
|
||
|
|
|
||
|
|
/*
|
||
|
|
* buf_putc -- append a character to a string in memory
|
||
|
|
*/
|
||
|
|
static slib_callback_t buf_putc; // setup calling convention
|
||
|
|
static void __SLIB_CALLBACK buf_putc( SPECS __SLIB *specs, int op_char )
|
||
|
|
{
|
||
|
|
struct buf_limit *info;
|
||
|
|
|
||
|
|
info = (struct buf_limit *)specs->_dest;
|
||
|
|
if( specs->_output_count < info->max_chars ) {
|
||
|
|
*( info->bufptr++ ) = op_char;
|
||
|
|
info->chars_output++;
|
||
|
|
}
|
||
|
|
specs->_output_count++;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
_WCRTLINK int __F_NAME(snprintf_s,snwprintf_s)( CHAR_TYPE * __restrict s, rsize_t n,
|
||
|
|
const CHAR_TYPE * __restrict format, ... )
|
||
|
|
{
|
||
|
|
va_list arg;
|
||
|
|
struct buf_limit info;
|
||
|
|
const char *msg;
|
||
|
|
|
||
|
|
/* First check the critical conditions; if any of those
|
||
|
|
* is violated, return immediately and don't touch anything.
|
||
|
|
*/
|
||
|
|
if( __check_constraint_nullptr_msg( msg, s )
|
||
|
|
&& __check_constraint_maxsize_msg( msg, n )
|
||
|
|
&& __check_constraint_zero_msg( msg, n ) ) {
|
||
|
|
|
||
|
|
/* The buffer looks okay, try doing something useful */
|
||
|
|
if( __check_constraint_nullptr_msg( msg, format ) ) {
|
||
|
|
int len;
|
||
|
|
|
||
|
|
info.bufptr = s;
|
||
|
|
info.chars_output = 0;
|
||
|
|
info.max_chars = n - 1;
|
||
|
|
msg = NULL;
|
||
|
|
va_start( arg, format );
|
||
|
|
len = __F_NAME(__prtf_s,__wprtf_s)( &info, format, arg, &msg, buf_putc );
|
||
|
|
va_end( arg );
|
||
|
|
if( msg == NULL ) {
|
||
|
|
/* No rt-constraint violation while formatting */
|
||
|
|
s[info.chars_output] = NULLCHAR;
|
||
|
|
return( len );
|
||
|
|
}
|
||
|
|
}
|
||
|
|
/* Something went wrong, output buffer will contain empty string */
|
||
|
|
*s = NULLCHAR;
|
||
|
|
}
|
||
|
|
__rtct_fail( __func__, msg, NULL );
|
||
|
|
return( -1 );
|
||
|
|
}
|