67 lines
1.7 KiB
C++
67 lines
1.7 KiB
C++
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/***
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* istruint.cpp - definitions for istream class operaotor>>(unsigned int) 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 int) member function 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 out from istream.cxx for granularity.
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* 01-06-92 KRS Improve error handling.
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* 12-30-92 KRS Fix indirection problem with **endptr.
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* 12-16-92 CFW Cast to get rid of compiler warning.
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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 int& n) - extract unsigned int
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*
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*Purpose:
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* Extract unsigned int value from stream
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* Valid range is INT_MIN to UINT_MAX.
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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=UINT_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 int& n)
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{
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_WINSTATIC char ibuffer[MAXLONGSIZ];
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unsigned long value;
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char ** endptr = (char**)NULL;
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if (ipfx(0)) {
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value = strtoul(ibuffer, endptr, getint(ibuffer));
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if (((value>UINT_MAX) && (value<=(ULONG_MAX-(unsigned long)(-INT_MIN))))
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|| ((value==ULONG_MAX) && (errno==ERANGE)))
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{
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n = UINT_MAX;
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state |= ios::failbit;
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}
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else
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n = (unsigned int) value;
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isfx();
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}
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return *this;
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}
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