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| Rev | Author | Line No. | Line |
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| 359 | 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: Near heap realloc routines. |
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| 28 | * |
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| 29 | ****************************************************************************/ |
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| 30 | |||
| 31 | |||
| 32 | //#include "dll.h" // needs to be first |
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| 33 | #include "variety.h" |
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| 34 | #include |
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| 35 | #include |
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| 36 | #include |
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| 37 | #include "heap.h" |
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| 38 | #if defined(__DOS_EXT__) |
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| 39 | #include "extender.h" |
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| 40 | #endif |
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| 41 | |||
| 42 | #if defined(__SMALL_DATA__) |
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| 43 | |||
| 44 | _WCRTLINK void *realloc( void *stg, size_t amount ) |
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| 45 | { |
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| 46 | return( _nrealloc( stg, amount ) ); |
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| 47 | } |
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| 48 | |||
| 49 | #endif |
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| 50 | |||
| 51 | #pragma intrinsic(memcpy) |
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| 52 | |||
| 53 | _WCRTLINK void _WCNEAR *_nrealloc( void _WCI86NEAR *stg, size_t req_size ) |
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| 54 | { |
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| 55 | void _WCNEAR *p; |
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| 56 | size_t old_size; |
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| 57 | |||
| 58 | if( stg == NULL ) { |
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| 59 | return( _nmalloc( req_size ) ); |
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| 60 | } |
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| 61 | if( req_size == 0 ) { |
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| 62 | _nfree( stg ); |
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| 63 | return( (void _WCNEAR *) NULL ); |
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| 64 | } |
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| 65 | old_size = _nmsize( stg ); |
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| 66 | p = _nexpand( stg, req_size ); /* try to expand it in place */ |
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| 67 | if( p == NULL ) { /* if couldn't be expanded in place */ |
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| 68 | #if defined(__DOS_EXT__) |
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| 69 | if( _IsRational() ) { |
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| 70 | frlptr flp, newflp; |
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| 71 | |||
| 72 | flp = (frlptr) ((PTR)stg - TAG_SIZE); |
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| 73 | newflp = __ReAllocDPMIBlock( flp, req_size + TAG_SIZE ); |
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| 74 | if( newflp ) { |
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| 75 | return( (void _WCNEAR *)((PTR)newflp + TAG_SIZE) ); |
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| 76 | } |
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| 77 | } |
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| 78 | #endif |
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| 79 | p = _nmalloc( req_size ); /* - allocate a new block */ |
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| 80 | if( p != NULL ) { /* - if we got one */ |
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| 81 | memcpy( p, stg, old_size ); /* copy it */ |
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| 82 | _nfree( stg ); /* and free old one */ |
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| 83 | } else { |
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| 84 | _nexpand( stg, old_size ); /* reset back to old size */ |
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| 85 | } |
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| 86 | } |
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| 87 | return( p ); |
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| 88 | } |