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/*
* Copyright (c) 1999 Stephen Williams (steve@icarus.com)
*
* This source code is free software; you can redistribute it
* and/or modify it in source code form under the terms of the GNU
* General Public License as published by the Free Software
* Foundation; either version 2 of the License, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
#ifdef HAVE_CVS_IDENT
#ident "$Id: verireal.cc,v 1.8 2002/08/12 01:35:01 steve Exp $"
#endif

# include "config.h"

# include "verireal.h"
# include <ctype.h>
# include <iostream>
# include <assert.h>

verireal::verireal()
{
      sign_ = false;
      mant_ = 0;
      exp10_ = 0;
}

verireal::verireal(const char*txt)
{
      mant_ = 0;
      sign_ = false;
      exp10_ = 0;

      const char*ptr = txt;
      for ( ; *ptr ; ptr += 1) {
if (*ptr == '.') break;
if (*ptr == 'e') break;
if (*ptr == 'E') break;
if (*ptr == '_') continue;

assert(isdigit(*ptr));

mant_ *= 10;
mant_ += *ptr - '0';
      }

      if (*ptr == '.') {
ptr += 1;
for ( ; *ptr ; ptr += 1) {
if (*ptr == 'e') break;
if (*ptr == 'E') break;
if (*ptr == '_') continue;

assert(isdigit(*ptr));

mant_ *= 10;
mant_ += *ptr - '0';
exp10_ -= 1;
}
      }

      if ((*ptr == 'e') || (*ptr == 'E')) {
ptr += 1;
long tmp = 0;
bool sflag = false;
if (*ptr == '+') {ptr += 1; sflag = false;}
if (*ptr == '-') {ptr += 1; sflag = true;}

for ( ; *ptr ; ptr += 1) {
if (*ptr == '_') continue;
assert(isdigit(*ptr));
tmp *= 10;
tmp += *ptr - '0';
}

exp10_ += sflag? -tmp : +tmp;
      }

      assert(*ptr == 0);
}

verireal::verireal(long val)
{
      sign_ = val < 0;
      mant_ = sign_? -val : +val;
      exp10_ = 0;
}

verireal::~verireal()
{
}

long verireal::as_long(int shift) const
{
      long val = mant_;
      int ex = exp10_ + shift;

      while (ex < 0) {
long mod = val % 10;
val /= 10;
if (ex == -1 && mod >= 5)
val += 1;
ex += 1;
      }

      while (ex > 0) {
val *= 10;
ex -= 1;
      }

      if (sign_)
return -val;
      else
return val;
}

verireal operator* (const verireal&l, const verireal&r)
{
      verireal res;
      res.sign_ = l.sign_ != r.sign_;
      res.mant_ = l.mant_ * r.mant_;
      res.exp10_= l.exp10_ + r.exp10_;
      return res;
}

ostream& operator<< (ostream&out, const verireal&v)
{
      out << (v.sign_? "-" : "+") << v.mant_ << "e" << v.exp10_;
      return out;
}

/*
* $Log: verireal.cc,v $
* Revision 1.8 2002/08/12 01:35:01 steve
* conditional ident string using autoconfig.
*
* Revision 1.7 2002/06/15 02:35:49 steve
* Rounding error.
*
* Revision 1.6 2001/11/06 06:11:55 steve
* Support more real arithmetic in delay constants.
*
* Revision 1.5 2001/07/25 03:10:50 steve
* Create a config.h.in file to hold all the config
* junk, and support gcc 3.0. (Stephan Boettcher)
*
* Revision 1.4 2001/07/07 20:20:10 steve
* Pass parameters to system functions.
*
* Revision 1.3 2000/12/10 22:01:36 steve
* Support decimal constants in behavioral delays.
*
* Revision 1.2 2000/02/23 02:56:56 steve
* Macintosh compilers do not support ident.
*
* Revision 1.1 1999/06/15 02:50:02 steve
* Add lexical support for real numbers.
*
*/
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