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/***
* istrulng.cxx - definitions for istream class operator>>(unsigned long) funct
*
* Copyright (c) 1991-1992, Microsoft Corporation. All rights reserved.
*
*Purpose:
* Definitions of operator>>(unsigned long) member function(s) for istream
* class.
* [AT&T C++]
*
*Revision History:
* 09-26-91 KRS Created. Split off from istream.cxx for granularity.
* 01-06-91 KRS Added check of errno.
* 12-30-92 KRS Fix indirection problem with **endptr.
*
*******************************************************************************/
#include <cruntime.h>
#include <internal.h>
#include <stdlib.h>
#include <limits.h>
#include <errno.h>
#include <iostream.h>
#pragma hdrstop
// CONSIDER: validify this maximum length
#define MAXLONGSIZ 16
/***
*istream& istream::operator>>(unsigned long& n) - extract unsigned long
*
*Purpose:
* Extract unsigned long value from stream
*
*Entry:
* n = value to update
*
*Exit:
* n updated, or ios::failbit and n=ULONG_MAX if error
*
*Exceptions:
* Stream error on entry or value out of range
*
*******************************************************************************/
istream& istream::operator>>(unsigned long& n)
{
_WINSTATIC char ibuffer[MAXLONGSIZ];
char ** endptr = (char**)NULL;
if (ipfx(0)) {
n = strtoul(ibuffer, endptr, getint(ibuffer));
if ((n==ULONG_MAX) && (errno==ERANGE))
{
state |= ios::failbit;
}
#if 0
if (**endptr)
{
//UNDONE: put back any unread characters, if possible
}
#endif
isfx();
}
return *this;
}
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