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/***
* istruint.cxx - definitions for istream class operaotor>>(unsigned int) funct
*
* Copyright (c) 1991-1992, Microsoft Corporation. All rights reserved.
*
*Purpose:
* Definitions of operator>>(unsigned int) member function for istream
* class.
* [AT&T C++]
*
*Revision History:
* 09-26-91 KRS Created. Split out from istream.cxx for granularity.
* 01-06-92 KRS Improve error handling.
* 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 all this maximum length
#define MAXLONGSIZ 16
/***
*istream& istream::operator>>(unsigned int& n) - extract unsigned int
*
*Purpose:
* Extract unsigned int value from stream
* Valid range is INT_MIN to UINT_MAX.
*
*Entry:
* n = value to update
*
*Exit:
* n updated, or ios::failbit and n=UINT_MAX if error
*
*Exceptions:
* Stream error on entry or value out of range
*
*******************************************************************************/
istream& istream::operator>>(unsigned int& n)
{
_WINSTATIC char ibuffer[MAXLONGSIZ];
unsigned long value;
char ** endptr = (char**)NULL;
if (ipfx(0)) {
value = strtoul(ibuffer, endptr, getint(ibuffer));
// CONSIDER: all but the first check is to emulate strtoul behavior
if (((value>UINT_MAX) && (value<=(ULONG_MAX-(-INT_MIN))))
|| ((value==ULONG_MAX) && (errno==ERANGE)))
{
n = UINT_MAX;
state |= ios::failbit;
}
else
n = (unsigned int) value;
#if 0
if (**endptr)
{
//UNDONE: put back any unread characters, if possible
}
#endif
isfx();
}
return *this;
}
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