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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 553 | serge | 1 | /**************************************************************************** |
| 2 | * |
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| 3 | * Open Watcom Project |
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| 4 | * |
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| 5 | * Portions Copyright (c) 1983-2002 Sybase, Inc. All Rights Reserved. |
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| 6 | * |
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| 7 | * ======================================================================== |
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| 8 | * |
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| 9 | * This file contains Original Code and/or Modifications of Original |
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| 10 | * Code as defined in and that are subject to the Sybase Open Watcom |
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| 11 | * Public License version 1.0 (the 'License'). You may not use this file |
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| 12 | * except in compliance with the License. BY USING THIS FILE YOU AGREE TO |
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| 13 | * ALL TERMS AND CONDITIONS OF THE LICENSE. A copy of the License is |
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| 14 | * provided with the Original Code and Modifications, and is also |
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| 15 | * available at www.sybase.com/developer/opensource. |
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| 16 | * |
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| 17 | * The Original Code and all software distributed under the License are |
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| 18 | * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER |
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| 19 | * EXPRESS OR IMPLIED, AND SYBASE AND ALL CONTRIBUTORS HEREBY DISCLAIM |
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| 20 | * ALL SUCH WARRANTIES, INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF |
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| 21 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR |
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| 22 | * NON-INFRINGEMENT. Please see the License for the specific language |
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| 23 | * governing rights and limitations under the License. |
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| 24 | * |
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| 25 | * ======================================================================== |
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| 26 | * |
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| 27 | * Description: Implementation of bsearch_s() - bounds-checking bsearch(). |
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| 28 | * |
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| 29 | ****************************************************************************/ |
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| 30 | |||
| 31 | |||
| 32 | #include "variety.h" |
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| 33 | #include "saferlib.h" |
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| 34 | #undef __INLINE_FUNCTIONS__ |
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| 35 | #include |
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| 36 | #include |
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| 37 | #include "extfunc.h" |
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| 38 | |||
| 39 | typedef int bcomp(); |
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| 40 | #ifdef _M_IX86 |
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| 41 | #pragma aux (__outside_CLIB) bcomp; |
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| 42 | #endif |
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| 43 | |||
| 44 | _WCRTLINK void * bsearch_s( const void * key, const void * base, |
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| 45 | rsize_t nmemb, rsize_t size, |
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| 46 | int (*compar)( const void *k, const void *y, void *context ), |
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| 47 | void *context ) |
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| 48 | /***********************************************************************/ |
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| 49 | { |
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| 50 | char *low; |
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| 51 | char *high; |
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| 52 | char *mid; |
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| 53 | int cond; |
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| 54 | bcomp *comp = compar; |
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| 55 | |||
| 56 | /* runtime-constraints */ |
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| 57 | // nmemb <= RSIZE_MAX |
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| 58 | // size <= RSIZE_MAX |
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| 59 | // if nmemb > 0 then key, base, compar not NULL |
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| 60 | if( __check_constraint_maxsize( nmemb ) && |
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| 61 | __check_constraint_maxsize( size ) && |
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| 62 | ( (nmemb == 0) || __check_constraint_nullptr( key ) && |
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| 63 | __check_constraint_nullptr( base ) && |
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| 64 | __check_constraint_nullptr( compar )) ) { |
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| 65 | |||
| 66 | if( nmemb == 0 ) { /* empty array - nothing to do */ |
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| 67 | return( NULL ); |
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| 68 | } |
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| 69 | low = (char *) base; |
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| 70 | high = low + (nmemb - 1) * size; |
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| 71 | while( low < high ) { |
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| 72 | mid = low + ( (high - low) / size / 2 ) * size; |
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| 73 | cond = (*comp)( key, mid, context ); |
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| 74 | if( cond == 0 ) return( mid ); |
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| 75 | if( cond < 0 ) { /* key < mid */ |
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| 76 | high = mid; |
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| 77 | } else { /* key > mid */ |
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| 78 | low = mid + size; |
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| 79 | } |
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| 80 | } |
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| 81 | if (low == high) return( (*comp)( key, low, context ) ? NULL : low ); |
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| 82 | } |
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| 83 | return( NULL ); |
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| 84 | } |