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85 lines
3.2 KiB
C
85 lines
3.2 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 bsearch_s() - bounds-checking bsearch().
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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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#undef __INLINE_FUNCTIONS__
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#include <stddef.h>
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#include <stdlib.h>
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#include "extfunc.h"
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typedef int bcomp();
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#ifdef _M_IX86
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#pragma aux (__outside_CLIB) bcomp;
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#endif
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_WCRTLINK void * bsearch_s( const void * key, const void * base,
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rsize_t nmemb, rsize_t size,
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int (*compar)( const void *k, const void *y, void *context ),
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void *context )
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/***********************************************************************/
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{
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char *low;
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char *high;
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char *mid;
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int cond;
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bcomp *comp = compar;
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/* runtime-constraints */
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// nmemb <= RSIZE_MAX
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// size <= RSIZE_MAX
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// if nmemb > 0 then key, base, compar not NULL
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if( __check_constraint_maxsize( nmemb ) &&
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__check_constraint_maxsize( size ) &&
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( (nmemb == 0) || __check_constraint_nullptr( key ) &&
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__check_constraint_nullptr( base ) &&
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__check_constraint_nullptr( compar )) ) {
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if( nmemb == 0 ) { /* empty array - nothing to do */
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return( NULL );
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}
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low = (char *) base;
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high = low + (nmemb - 1) * size;
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while( low < high ) {
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mid = low + ( (high - low) / size / 2 ) * size;
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cond = (*comp)( key, mid, context );
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if( cond == 0 ) return( mid );
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if( cond < 0 ) { /* key < mid */
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high = mid;
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} else { /* key > mid */
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low = mid + size;
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}
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}
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if (low == high) return( (*comp)( key, low, context ) ? NULL : low );
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}
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return( NULL );
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}
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