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91 lines
3.4 KiB
C
91 lines
3.4 KiB
C
/****************************************************************************
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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 strncat_s() - bounds-checking strncat().
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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 <string.h>
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#include <wchar.h>
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_WCRTLINK errno_t __F_NAME(strncat_s,wcsncat_s)( CHAR_TYPE * __restrict s1,
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rsize_t s1max, const CHAR_TYPE * __restrict s2,
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rsize_t n )
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/*************************************************************************/
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{
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errno_t rc = -1;
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const char *msg;
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// strnlen_s is safe to use as it has no rt constraints
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rsize_t m = s1max - __F_NAME(strnlen_s,wcsnlen_s)( s1, s1max );
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// Verify runtime-constraints
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// s1 not NULL
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// s2 not NULL
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// s1max <= RSIZE_MAX
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// n <= RSIZE_MAX
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// s1max != 0
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// m = s1max - strnlen_s( s1, s1max ) != 0
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// if n >= m then m > strnlen_s( s2, m )
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// s1 and s2 no overlap
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if( __check_constraint_nullptr_msg( msg, s1 ) &&
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__check_constraint_nullptr_msg( msg, s2 ) &&
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__check_constraint_maxsize_msg( msg, s1max ) &&
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__check_constraint_maxsize_msg( msg, m ) &&
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__check_constraint_zero_msg( msg, s1max ) &&
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__check_constraint_zero_msg( msg, m ) &&
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((n < m) || __check_constraint_a_gt_b_msg( msg, __F_NAME(strnlen_s,wcsnlen_s)( s2, m ), m - 1 )) &&
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__check_constraint_overlap_msg( msg, s1, s1max, s2, __F_NAME(strnlen_s,wcsnlen_s)( s2, s1max ))) {
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while( *s1 != NULLCHAR ) ++s1; //find end of field
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while( n != 0 ) {
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*s1 = *s2;
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if( *s2 == NULLCHAR ) break;
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++s1;
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++s2;
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--n;
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}
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*s1 = NULLCHAR;
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rc = 0;
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} else {
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// Runtime-constraints found, store zero in receiving field
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if( (s1 != NULL) && (s1max > 0) && __lte_rsizmax( s1max ) ) {
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s1[0] = NULLCHAR;
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}
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// Now call the handler
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__rtct_fail( __func__, msg, NULL );
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}
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return( rc );
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}
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