heapset.c

来自「开放源码的编译器open watcom 1.6.0版的源代码」· C语言 代码 · 共 85 行

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*                            Open Watcom Project
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*    Portions Copyright (c) 1983-2002 Sybase, Inc. All Rights Reserved.
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#include "dll.h"        // needs to be first
#include "variety.h"
#include <stddef.h>
#include <malloc.h>
#include <string.h>
#include <i86.h>
#include "heap.h"
#include "heapacc.h"


#if defined(__386__)
#define STOSW   0x66 0xab
#define _DI     edi
#define _CX     ecx
#else
#define STOSW   0xab
#define _DI     di
#define _CX     cx
#endif

extern  void    far_memset(void _WCFAR *,int,unsigned);
#pragma aux     far_memset = \
        0xd1 0xe9       /* shr cx,1 */\
        0xf3 STOSW      /* rep stosw */\
        0x11 0xc9       /* adc cx,cx */\
        0xf3 0xaa       /* rep stosb */\
        parm caller [es _DI] [ax] [_CX] \
        modify exact [_DI _CX];



int __HeapSet( __segment seg, unsigned int fill )
    {
        farfrlptr  curr;
        struct heapblk _WCFAR *p;

        fill |= fill << 8;
        _AccessFHeap();
        while( seg != 0 ) {
            p = MK_FP( seg, 0 );
            curr = MK_FP( seg, p->freehead.next );
            for(;;) {
                if( FP_OFF(curr) == offsetof(struct heapblk, freehead) ) break;
                far_memset( (void _WCFAR *)(curr + 1), fill,
                            curr->len - sizeof(frl) );
                curr = MK_FP( seg, curr->next );
            }
            seg = p->nextseg;
        }
        _ReleaseFHeap();
        return( _HEAPOK );
    }