101 lines
3.5 KiB
C
101 lines
3.5 KiB
C
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/****************************************************************************
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*
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* Open Watcom Project
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*
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* Portions Copyright (c) 1983-2002 Sybase, Inc. All Rights Reserved.
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*
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* ========================================================================
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*
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* This file contains Original Code and/or Modifications of Original
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* Code as defined in and that are subject to the Sybase Open Watcom
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* Public License version 1.0 (the 'License'). You may not use this file
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* except in compliance with the License. BY USING THIS FILE YOU AGREE TO
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* ALL TERMS AND CONDITIONS OF THE LICENSE. A copy of the License is
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* provided with the Original Code and Modifications, and is also
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* available at www.sybase.com/developer/opensource.
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*
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* The Original Code and all software distributed under the License are
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* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
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* EXPRESS OR IMPLIED, AND SYBASE AND ALL CONTRIBUTORS HEREBY DISCLAIM
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* ALL SUCH WARRANTIES, INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR
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* NON-INFRINGEMENT. Please see the License for the specific language
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* governing rights and limitations under the License.
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*
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* ========================================================================
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*
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* Description: Implementation of snprintf_s() - safe string fmt'd output.
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*
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****************************************************************************/
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#include "variety.h"
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#include "saferlib.h"
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#include "widechar.h"
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#include <stdio.h>
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#include <stdarg.h>
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#include <wchar.h>
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#include "printf.h"
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struct buf_limit {
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CHAR_TYPE *bufptr;
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rsize_t chars_output;
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rsize_t max_chars;
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};
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/*
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* buf_putc -- append a character to a string in memory
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*/
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static slib_callback_t buf_putc; // setup calling convention
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static void __SLIB_CALLBACK buf_putc( SPECS __SLIB *specs, int op_char )
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{
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struct buf_limit *info;
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info = (struct buf_limit *)specs->_dest;
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if( specs->_output_count < info->max_chars ) {
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*( info->bufptr++ ) = op_char;
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info->chars_output++;
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}
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specs->_output_count++;
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}
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_WCRTLINK int __F_NAME(snprintf_s,snwprintf_s)( CHAR_TYPE * __restrict s, rsize_t n,
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const CHAR_TYPE * __restrict format, ... )
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{
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va_list arg;
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struct buf_limit info;
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const char *msg;
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/* First check the critical conditions; if any of those
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* is violated, return immediately and don't touch anything.
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*/
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if( __check_constraint_nullptr_msg( msg, s )
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&& __check_constraint_maxsize_msg( msg, n )
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&& __check_constraint_zero_msg( msg, n ) ) {
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/* The buffer looks okay, try doing something useful */
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if( __check_constraint_nullptr_msg( msg, format ) ) {
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int len;
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info.bufptr = s;
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info.chars_output = 0;
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info.max_chars = n - 1;
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msg = NULL;
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va_start( arg, format );
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len = __F_NAME(__prtf_s,__wprtf_s)( &info, format, arg, &msg, buf_putc );
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va_end( arg );
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if( msg == NULL ) {
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/* No rt-constraint violation while formatting */
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s[info.chars_output] = NULLCHAR;
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return( len );
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}
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}
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/* Something went wrong, output buffer will contain empty string */
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*s = NULLCHAR;
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}
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__rtct_fail( __func__, msg, NULL );
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return( -1 );
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}
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