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#include "String.h"
#include <cstring>
/* Private */
void String::free() {
delete[] str;
}
void String::copyFrom(const String& other) {
str = new char[other.length + 1];
strncpy(str, other.str, other.length + 1);
length = other.length;
}
/* Public */
/*!
* Allocated with length + 1 size, so there is a terminating zero at the end.
*/
String::String(unsigned length) {
this->length = length;
str = new char[length + 1];
str[length] = '\0';
}
/*! \params str C-style string
*/
String::String(const char* str) {
length = strlen(str);
this->str = new char[length + 1]; // capture terminating zero
strncpy(this->str, str, length + 1);
}
const char* String::get_cstr() const {
return str;
}
unsigned String::get_length() const {
return length;
}
char& String::operator[](unsigned index) {
return str[index];
}
/*! \params str C-style string
*/
String& String::operator+=(const char* str) {
unsigned strLen = strlen(str);
char* newStr = new char[length + strLen + 1];
strncpy(newStr, this->str, length + 1);
strncat(newStr, str, strLen + 1);
delete[] this->str;
this->str = newStr;
length += strLen;
return *this;
}
/*!
* Converts the number to a C-style string and then uses += to append it.
*/
String& String::operator+=(int number) {
if (number < 0) {
*this += "-";
number *= -1;
}
return *this += (unsigned)number;
}
/*!
* Converts the number to a C-style string and then uses += to append it.
*/
String& String::operator+=(unsigned number) {
unsigned tempLen = 0;
for (unsigned tmp = number; tmp > 0 || tempLen == 0; tmp /= 10)
tempLen++;
char* tmp = new char[tempLen + 1];
tmp[tempLen] = '\0';
for (unsigned i = tempLen - 1; i < tempLen; i--, number /= 10)
tmp[i] = number % 10 + '0';
*this += tmp;
delete[] tmp;
return *this;
}
/*!
* Converts the number to a C-style string and then uses += to append it.
*/
String& String::operator+=(double number) {
if (number < 0) {
*this += "-";
number *= -1;
}
number += 1.0 / (DOUBLE_PRECISION * 10); // bump up the number, in cases it becomes something like 8.59999999999...
return ((*this += (unsigned)number) += ".")
+= (unsigned)((number - (unsigned)number) * DOUBLE_PRECISION);
}
String::String() : String("") {}
String::String(const String& other) {
copyFrom(other);
}
String& String::operator=(const String& other) {
if (this != &other) {
free();
copyFrom(other);
}
return *this;
}
String::~String() {
free();
}
String::String(String&& other) {
str = other.str;
other.str = nullptr;
length = other.length;
}
String& String::operator=(String&& other) {
if (this != &other) {
delete[] str;
str = other.str;
other.str = nullptr;
length = other.length;
}
return *this;
}
/*! \param istr An input stream
*
* Directly reads bytes from stream (calls read() function).
* First reads the string length, then the underlying C-style string (including terminating zero).
*
* \remark Doesn't alter the stream in any other way.
* \note Best used with binary ifstream
*/
void String::read(std::istream& istr) {
istr.read((char*)&length, sizeof(length));
istr.read(str, sizeof(char) * (length + 1));
}
/*! \param ostr An output stream
*
* Directly writes bytes to stream (calls write() function).
* First writes the string length, then the underlying C-style string (including terminating zero).
*
* \remark Doesn't alter the stream in any other way.
* \note Best used with binary ofstream
*/
void String::write(std::ostream& ostr) const {
ostr.write((char*)&length, sizeof(length));
ostr.write(str, sizeof(char) * (length + 1));
}
/*! \params other C-style string
* \returns strcmp between underlying C-style string and "other"
*/
int String::compare(const String& other) const {
return strcmp(str, other.str);
}
/*!
* Uses the stream's getline function to read the data.
*
* \warning It takes at most 1024 characters from the stream!
* \note Best used with std::cin or text std::ifstream
*/
std::istream& operator>>(std::istream& istr, String& event) {
istr.getline(event.str, 1024);
event.length = strlen(event.str);
return istr;
}
/*!
* Uses the stream's << operator to write the underlying C-style string
*
* \note Best used with std::cout or text std::ofstream
*/
std::ostream& operator<<(std::ostream& ostr, const String& event) {
return ostr << event.str;
}
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