IntToChar Template Function with Corrections

IntToChar Template Function with Corrections

[Joseph D. Wagner]

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I've corrected a few quirks and bugs in my original file.

Just to remind you in case you forgot:

I created a template function that will convert an integer of any form
(unsigned/signed, short/long) to its char array equivalent.

For example,

int myInt = 768;

is converted into

char myChar[] = {"768"};

This isn't exactly how it works but I wrote that little bit just to complete
your mental picture.

You pass to the function IntToChar an integer of any type and it will return
a pointer to a char array.

For example:

const char *myChar = IntToChar(myInt);

I tested it, and it works.  It's fully operational, but I'm sure somebody
out there will find quirks that can be tweaked.

Any such comments would be appreciated!

TIA

Joseph Wagner 

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// Template Function: IntToChar

// Copyright © 2002 Joseph Wagner.  All rights reserved.
// Email: wagnerjd@users.sourceforge.net
// 
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
// 
// This library 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
// Lesser General Public License for more details.
// 
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

#pragma once

// Allows Ports to Non-Windows
#if !defined(_WIN32) && !defined(_WIN64)
	typedef long long int __int64;
#endif

#include <bitset>
using std::bitset;
#include <typeinfo>
#include <cstring>
#include <cmath>

template<typename IntegerType>
const char *IntToChar(IntegerType number) {
	// Supports 64-bit integers
	const bitset<64> number64 = number;
	char dataType[64] = {0};
	static char character64[22] = {0};	// 64-bit numbers never have more than 20 digits
	unsigned short pointer = 0;
	unsigned short digitHolder = 0;
	const unsigned short AsciiOffset = 48;
    
	// Determines size in bits
    const unsigned short sizeInBits = sizeof(IntegerType) * 8;
	const unsigned short lastBit = sizeInBits - 1;

	// Obtains type information
	strncpy(dataType, typeid(IntegerType).name(), 64);

	// Determines if signed or unsigned
	bool isUnsigned = false;
	char *tokenDataType = strtok(dataType, " ");
	while(tokenDataType != NULL) {
		if(strcmp(tokenDataType, "unsigned")) {
			isUnsigned = true;
		}
		tokenDataType = strtok(NULL, " ");
	}

	// Deals with sign
	if(!isUnsigned && number64[lastBit] == 1) {
        character64[pointer] = '-';
        pointer++;
	}

    // Converts individual digits to characters
	for(unsigned __int64 divisor = 10000000000000000000; divisor >= 1; divisor /= 10) {
		if(divisor <= number) {
			digitHolder = static_cast<unsigned short>(floor(number / static_cast<double>(divisor)));
			character64[pointer] = static_cast<char>(digitHolder + AsciiOffset);
			number -= static_cast<IntegerType>(digitHolder * divisor);
			pointer++;
		}
	}

	// Finishes up with terminating null character
	character64[pointer] = '\0';

	return character64;
}