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How to fix error

Boomers (29)
So I am working on an assignment and it works for the most part but at the end I get an error message that says Heap corruption detected after normal block (#137) CRT detected that the application wrote to memory after end of heap. I have been working on this for a while and can't figure out what I am doing wrong. Here is the code:

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  #include "Text.h"
 
Text::Text ( const char *charSeq)
{
  bufferSize = (unsigned)strlen(charSeq);
 
	buffer = new char [bufferSize];
	for(int i = 0; i <= bufferSize; i++){ 
		buffer[i] = charSeq[i];
	}
}
 
Text::Text ( const Text &other )
{
	bufferSize = other.getLength();
	buffer = new char[bufferSize];
	for(int i = 0; i <= bufferSize; i++){
		buffer[i] = other[i];
	}
}
 
void Text::operator = ( const Text &other )
{
	if (this != &other){
		delete [] buffer;
		bufferSize = other.getLength(); 
		buffer = new char[bufferSize];
		for (int i = 0; i < bufferSize; i++){
			buffer[i] = other[i];
		}
	}
}
 
Text::~Text ()
{
	//...
	delete [] buffer;
}
 
int Text::getLength () const
{
	return bufferSize;
}
 
char Text::operator [] ( int n ) const
{
	if (n >= 0 && n < bufferSize){
		return buffer[n];
	}
	else{
		return '\0';
	}
}
 
void Text::clear ()
{
	delete [] buffer;
	buffer = new char[bufferSize];
	for(int i=0; i < bufferSize;i++){
		buffer[i] = ' ';
	}
}
 
void Text::showStructure () const
{
	for (int i=0;i < bufferSize;i++){
		cout << buffer[i];
	}
	cout << endl;
}
 
Text Text::toUpper( ) const
{
	Text temp(buffer);
	for(int i=0; i < bufferSize; i++){
		if((buffer[i] > 96) && (buffer[i] < 123)){
			temp.buffer[i] = char(buffer[i] - 32);
		}
	}
	return temp;
}
 
Text Text::toLower( ) const
{
	Text temp(buffer);
	for(int i=0; i < temp.getLength(); i++){
		if((buffer[i] > 64) && (buffer[i] < 91)){
			temp.buffer[i] = char(buffer[i] + 32);
		} 
	}
	return temp;
}
 
bool Text::operator == ( const Text& other ) const
{
	if(bufferSize == other.getLength()){
		if(bufferSize == 0){
			return true;
		}
		else{
			for(int i = 0; i < bufferSize; i++){
				if(buffer[i] != other.buffer[i]){
					return false;
				}
			}
			return true;
		}
	} 
	else{
		return false;
	}
}
 
bool Text::operator <  ( const Text& other ) const
{
	if (other.getLength()){
		if(bufferSize){
		    for(int i = 0; i < bufferSize; i++){
			    if (buffer[i] > other.buffer[i]){
				    return false;
			    }
			}
		    if((other.getLength() < bufferSize) || (other.getLength() == bufferSize)){
			    return false;
			}
		    else{
			    return true;
		    }
		}
		else{
			return true;
		}
	}
	return false;
}
 
bool Text::operator >  ( const Text& other ) const
{
	if(bufferSize){
		if(other.getLength()){
		    for(int i = 0; i < other.getLength(); i++){
			    if (buffer[i] < other.buffer[i]){
				    return false;
			    }
			}
		    if((other.getLength() > bufferSize) || (other.getLength() == bufferSize)){
			    return false;
			}
		    else{
			    return true;
		    }
		}
		else{
			return true;
		}
	}
	return false;
}
Peter87 (11175)
If you want to write the null character to the buffer you need to allocate one extra character (bufferSize + 1).
Boomers (29)
I'm getting confused because someone told me something similar but it was not where the Null was written at. What line are you referring to?

Thank you
AbstractionAnon (6954)
See your other thread.
http://www.cplusplus.com/forum/general/143138/#msg755299

Please do not cross-post.
Boomers (29)
Sorry. I'm extremely tired and thought I didn't post it before.
Boomers (29)
Ok. I got it now. Thank you so much for the help I understand what I did wrong
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