numbers.cpp

贡献一份commoncpp2,有兴趣的可以研究一下

// Copyright (C) 1999-2005 Open Source Telecom Corporation.
//  
// This program is free software; you can redistribute it and/or modify
// it 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.
// 
// As a special exception, you may use this file as part of a free software
// library without restriction.  Specifically, if other files instantiate
// templates or use macros or inline functions from this file, or you compile
// this file and link it with other files to produce an executable, this
// file does not by itself cause the resulting executable to be covered by
// the GNU General Public License.  This exception does not however    
// invalidate any other reasons why the executable file might be covered by
// the GNU General Public License.    
//
// This exception applies only to the code released under the name GNU
// Common C++.  If you copy code from other releases into a copy of GNU
// Common C++, as the General Public License permits, the exception does
// not apply to the code that you add in this way.  To avoid misleading
// anyone as to the status of such modified files, you must delete
// this exception notice from them.
//
// If you write modifications of your own for GNU Common C++, it is your choice
// whether to permit this exception to apply to your modifications.
// If you do not wish that, delete this exception notice.
//

#include <cc++/config.h>
#include <cc++/string.h>
#include <cc++/thread.h>
#include <cc++/export.h>
#include <cc++/numbers.h>
#include <cstdlib>

#ifdef	CCXX_NAMESPACES
namespace ost {
#endif

Number::Number(char *buf, unsigned width)
{
	if(width > 10)
		width = 10;
	if(width < 1)
		width = 1;
	size = width;

	buffer = buf;
}

long Number::getValue(void) const
{
	int count = size;
	bool sign = false;
	long ret = 0;
	char *bp = buffer;

	if(*bp == '-')
	{
		--count;
		++bp;
		sign = true;
	}
	else if(*bp == '+')
	{
		--count;
		++bp;
	}
	while(count && *bp >='0' && *bp <='9')
	{
		ret = ret * 10l + (*bp - '0');
		--count;
		++bp;
	}
	
	if(sign)
		ret = -ret;
	return ret;
}	

void Number::setValue(long value)
{
	int count = size;
	char *bp = buffer;
	long max = 1;
	int exp;
	bool z = false;
	
	if(value < 0)
	{
		value = -value;
		--count;
		*(bp++) = '-';
	}
	
	exp = count;
	while(--exp)
		max *= 10;

	while(max)
	{
		if(value >= max || z)
		{
			--count;
			*(bp++) = '0' + ((char)(value / max));
		}
		if(value >= max)
		{
			z = true;
			value -= (value / max) * max;
		}
		max /= 10;
	}
	while(count-- && *bp >= '0' && *bp <='9')
		*(bp++) = ' ';
}

long Number::operator=(long value)
{
	setValue(value);
	return value;
}

long Number::operator+=(const long value)
{
	long value1 = getValue() + value;
	setValue(value1);
	return value1;
}

long Number::operator-=(const long value)
{
	long value1 = getValue() - value;
	setValue(value1);
	return value1;
}

long Number::operator--()
{
	long val = getValue();
	setValue(--val);
	return val;
}

long Number::operator++()
{
	long val = getValue();
	setValue(++val);
	return val;
}

int Number::operator==(const Number &num)
{
	return getValue() == num.getValue();
}

int Number::operator!=(const Number &num)
{
	return getValue() != num.getValue();
}

int Number::operator<(const Number &num)
{
	return getValue() < num.getValue();
}

int Number::operator<=(const Number &num)
{
	return getValue() <= num.getValue();
}

int Number::operator>(const Number &num)
{
	return getValue() > num.getValue();
}

int Number::operator>=(const Number &num)
{
	return getValue() >= num.getValue();
}
 
ZNumber::ZNumber(char *buf, unsigned chars) :
Number(buf, chars)
{}

void ZNumber::setValue(long value)
{
	int count = size;
	char *bp = buffer;
	long max = 1;
	int exp;
	
	if(value < 0)
	{
		value = -value;
		--count;
		*(bp++) = '-';
	}
	
	exp = count;
	while(--exp)
		max *= 10;

	while(max)
	{
		--count;
		*(bp++) = '0' + (char)(value / max);
		value -= (value / max) * max;
		max /= 10;
	}
}
 
long ZNumber::operator=(long value)
{
	setValue(value);
	return value;
}

long operator+(const Number &num, long val)
{
	return num.getValue() + val;
}

long operator+(long val, const Number &num)
{
	return num.getValue() + val;
}

long operator-(const Number &num, long val)
{
	return num.getValue() - val;
}

long operator-(long val, const Number &num)
{
	return num.getValue() - val;
}

#ifdef	CCXX_NAMESPACES
}
#endif