59 lines
1.5 KiB
C++
59 lines
1.5 KiB
C++
/***
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* istrulng.cpp - definitions for istream class operator>>(unsigned long) funct
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*
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* Copyright (c) 1991-2001, Microsoft Corporation. All rights reserved.
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*
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*Purpose:
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* Definitions of operator>>(unsigned long) member function(s) for istream
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* 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 off from istream.cxx for granularity.
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* 01-06-91 KRS Added check of errno.
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* 12-30-92 KRS Fix indirection problem with **endptr.
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* 05-24-94 GJF Moved definition of MAXLONGSIZ to istream.h.
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* 06-14-95 CFW Comment cleanup.
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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 <errno.h>
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#include <iostream.h>
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#pragma hdrstop
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/***
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*istream& istream::operator>>(unsigned long& n) - extract unsigned long
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*
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*Purpose:
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* Extract unsigned long 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 and n=ULONG_MAX if error
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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>>(unsigned long& n)
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{
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_WINSTATIC char ibuffer[MAXLONGSIZ];
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char ** endptr = (char**)NULL;
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if (ipfx(0)) {
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n = strtoul(ibuffer, endptr, getint(ibuffer));
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if ((n==ULONG_MAX) && (errno==ERANGE))
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{
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state |= ios::failbit;
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}
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isfx();
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}
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return *this;
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}
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