59 lines
1.3 KiB
C++
59 lines
1.3 KiB
C++
/***
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* istrflt.cxx - definitions for istream operator>>(float) member function
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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>>(float) member function 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 <float.h>
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#include <iostream.h>
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#pragma hdrstop
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#pragma check_stack(on) // large buffer(s)
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// CONSIDER: validate this maximum length
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#define MAXFLTSIZ 20
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istream& istream::operator>>(float& n)
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{
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_WINSTATIC char ibuffer[MAXFLTSIZ];
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double d;
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char ** endptr = (char**)NULL;
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if (ipfx(0))
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{
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if (getdouble(ibuffer, MAXFLTSIZ)>0)
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{
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d = strtod(ibuffer, endptr);
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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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if (d > FLT_MAX)
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n = FLT_MAX;
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else if (d < -FLT_MAX)
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n = -FLT_MAX;
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else if ((d>0) && (d< FLT_MIN))
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n = FLT_MIN;
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else if ((d<0) && (d> -FLT_MIN))
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n = - FLT_MIN;
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else
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n = (float) d;
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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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