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C/C++ Users Group Library 1996 July
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C-C++ Users Group Library July 1996.iso
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v_03_06
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3n06017a
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1992-04-27
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419b
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19 lines
#include <windows.h>
#include <dos.h>
/* use /G2 option with MSC */
int ValidPointer(void far *Ptr)
{
WORD BadSelector = FALSE;
register WORD Selector = HIWORD(Ptr);
register WORD Limit = 0;
_asm lsl Limit, Selector;
_asm jz Good;
_asm mov BadSelector, TRUE;
Good:
return !BadSelector && (Limit >= LOWORD(Ptr));
}