72 lines
1.5 KiB
C++
72 lines
1.5 KiB
C++
/***
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* istrint.cxx - definitions for istream class operaotor>>(int) member functions
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*
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* Copyright (c) 1991-1992, Microsoft Corporation. All rights reserved.
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*
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*Purpose:
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* Definitions of operator>>(int) member function(s) for istream class.
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* [AT&T C++]
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*
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*Revision History:
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* 09-26-91 KRS Created. Split out from istream.cxx for granularity.
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* 12-30-92 KRS Fix indirection problem with **endptr.
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*
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*******************************************************************************/
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#include <cruntime.h>
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#include <internal.h>
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#include <stdlib.h>
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#include <limits.h>
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#include <iostream.h>
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#pragma hdrstop
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// CONSIDER: validify all this maximum length
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#define MAXLONGSIZ 16
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/***
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*istream& istream::operator>>(int& n) - extract int
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*
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*Purpose:
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* Extract int value from stream
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*
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*Entry:
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* n = value to update
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*
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*Exit:
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* n updated, or ios::failbit & n=INT_MAX/INT_MIN on overflow/underflow
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*
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*Exceptions:
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* Stream error on entry or value out of range
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*
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*******************************************************************************/
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istream& istream::operator>>(int& n)
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{
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_WINSTATIC char ibuffer[MAXLONGSIZ];
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long value;
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char ** endptr = (char**)NULL;
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if (ipfx(0))
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{
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value = strtol(ibuffer, endptr, getint(ibuffer));
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if (value>INT_MAX)
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{
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n = INT_MAX;
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state |= ios::failbit;
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}
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else if (value<INT_MIN)
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{
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n = INT_MIN;
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state |= ios::failbit;
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}
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else
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n = (int) value;
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#if 0
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if (**endptr)
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{
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// UNDONE: put back any unread characters, if possible
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}
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#endif
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isfx();
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}
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return *this;
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}
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