Input Stream Invalid read/write of size 1 - c++

Question

i've been absolutely lost on this topic. I wrote my own String class and tried running it in valgrind to see of it really works. Valgrind tells me that i got a lot of invalid read's and write's.
Basically what im trying to do is feed it a String Value and read it's contents later on. For this i defined following Header file.
#ifndef STRING_H_INCLUDED
#define STRING_H_INCLUDED
#include<iostream>
#include<istream>
#include<ostream>
class string{
public:
string(char* = nullptr);
~string();
string(const string&);
friend std::istream& operator>>(std::istream&,string&);
friend std::ostream& operator<<(std::ostream&,string&);
bool operator<(const string&);
bool operator==(const string&);
void setContent(char*);
char* getContent() const;
private:
unsigned getSize() const;
void copyStr(char*,char*);
unsigned getCharl(const char*)const;
string& operator=(const string&);
char* s = nullptr;
};
#endif // STRING_H_INCLUDED
The CPP for the Header looks like the following.
#include<iostream>
#include<ostream>
#include "string.h"
string::string(char* i){
if(i == nullptr){
s = new char[1];
s[0] = '\0';
}else{
s = new char[getCharl(i)+1];
copyStr(s,i);
}
}
string::~string(){
if(s != nullptr){
delete s;
}
}
unsigned string::getCharl(const char* i) const{
const char* ende = i;
for(; *ende != '\0';++ende)
;
return ende-i;
}
void string::copyStr(char* s,char* i){
unsigned index = 0;
s = new char[getCharl(i)+1];
while (i[index] != '\0'){
s[index] = i[index];
index++;
}
s[index] = '\0';
}
bool string::operator<(const string& s1){
if(getSize()<s1.getSize()){
return true;
}else if(getSize()>s1.getSize()){
return false;
}else{
for(unsigned i = 0; i < s1.getSize();++i){
if(getContent()[i] != s1.getContent()[i]){
if(getContent()[i]<s1.getContent()[i]){
return true;
}else{
return false;
}
}
}
return false;
}
}
string::string(const string& x){
delete s;
s = new char[x.getSize()];
char* tmp = x.getContent();
unsigned index = 0;
while (tmp[index] != '\0'){
this->s[index] = x.s[index];
index++;
}
}
char* string::getContent() const{
return s;
}
void string::setContent(char* v){
s = v;
}
string& string::operator=(const string& x){
if(this == &x)
return *this;
if(&x != this){
delete getContent();
setContent(nullptr);
setContent(new char[x.getSize()]);
}
copyStr(getContent(),x.getContent());
return *this;
}
bool string::operator==(const string& l){
if(getSize() == l.getSize()){
unsigned length = getSize();
for(unsigned i = 0; i < length;++i){
if(getContent()[i] != l.getContent()[i])
return false;
}
return true;
}
return false;
}
std::istream& operator>>(std::istream& is, string& arg){
return is >> arg.s;
}
std::ostream& operator<<(std::ostream& os, string& arg){
return os << arg.getContent();
}
unsigned string::getSize() const{
unsigned length = 0;
while(s[length]){
++length;
}
++length;
return length;
}
Basically i would be pretty happy to know why i get an error in my operator>> where i try to write a char* Array to my char* s.
And i would like to know why i get an error in my function getSize() in the while-loop. (Error appears at s[length]).
Maybe someone is so kind to explain me the reasons.
Cheers!
Edit:
Modified the program now to look like the following implementing the comments.
#include<iostream>
#include<ostream>
#include "string.h"
string::string(char* i){
if(i == nullptr){
s = new char[1];
s[0] = '\0';
}else{
s = new char[getCharl(i)+1];
copyStr(i);
}
}
string::~string(){
if(s != nullptr){
delete[] s;
}
}
unsigned string::getCharl(const char* i) const{
const char* ende = i;
for(; *ende != '\0';++ende)
;
return ende-i;
}
void string::copyStr(char* i){
unsigned index = 0;
delete[] s;
char* tmp = new char[getCharl(i)+1];
while (i[index] != '\0'){
tmp[index] = i[index];
index++;
}
tmp[index] = '\0';
s = tmp;
}
bool string::operator<(const string& s1){
if(getSize()<s1.getSize()){
return true;
}else if(getSize()>s1.getSize()){
return false;
}else{
for(unsigned i = 0; i < s1.getSize();++i){
if(getContent()[i] != s1.getContent()[i]){
if(getContent()[i]<s1.getContent()[i]){
return true;
}else{
return false;
}
}
}
return false;
}
}
string::string(const string& x){
copyStr(x.getContent());
}
char* string::getContent() const{
return s;
}
void string::setContent(char* v){
s = v;
}
string& string::operator=(const string& x){
if(this == &x)
return *this;
if(&x != this){
delete[] getContent();
setContent(nullptr);
setContent(new char[x.getSize()]);
}
copyStr(x.getContent());
return *this;
}
bool string::operator==(const string& l){
if(getSize() == l.getSize()){
unsigned length = getSize();
for(unsigned i = 0; i < length;++i){
if(getContent()[i] != l.getContent()[i])
return false;
}
return true;
}
return false;
}
std::istream& operator>>(std::istream& is, string& arg){
is >> arg.s;
return is;
}
std::ostream& operator<<(std::ostream& os, string& arg){
return os << arg.getContent();
}
unsigned string::getSize() const{
unsigned length = 0;
while(getContent()[length]){
++length;
}
++length;
return length;
}
Still the problem with the operator>> exists and also now im getting errors in getCharl in the for loop and copyStr im the while loop. (invalid read)
If someone would be so kind and explain to me why.