164 lines
2.2 KiB
C++
164 lines
2.2 KiB
C++
// mystring.cpp
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//
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// Programmer: Carmen Sarro
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// Copyright (c) Microsoft Corporation, 1997
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//
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// Microsoft Technical Education
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// C++ Programming
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// Lab 1
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#include "pch.h"
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#pragma hdrstop
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MyString::MyString()
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{
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Zero();
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*data = L'\0';
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m_len = 0;
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}
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MyString::MyString(wchar_t *str)
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{
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Zero();
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m_len = wcslen(str);
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// Since strlen returns the number of characters in str, excluding the terminal NULL,
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// and since strncpy does not automatically append the terminal NULL,
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// if m_len < MAX_LEN we want to copy m_len + 1 characters because we assume the
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// last character of the source string is the terminal NULL. Otherwise we explicitly
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// set the last element to the terminal NULL.
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if (m_len >= MAX_LEN - 1){
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m_len = MAX_LEN - 1;
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wcsncpy(data, str, m_len);
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data[m_len] = L'\0';
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}
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else {
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wcscpy(data, str);
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}
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}
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MyString::MyString (const MyString& MyStr)
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{
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wcscpy(data, MyStr.data);
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m_len = wcslen(MyStr.data);
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this->NullTerminate();
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}
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const MyString& MyString::operator= (PCWSTR lp)
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{
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Zero();
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wcscpy(data, lp);
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m_len = wcslen(lp);
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this->NullTerminate();
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return (*this);
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}
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const MyString& MyString::operator= (const MyString& MyStr)
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{
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wcscpy(data, MyStr.data);
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m_len = MyStr.m_len;
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this->NullTerminate();
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return (*this);
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}
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const wchar_t* MyString::wcharptr()
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{
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return data;
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}
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int MyString::len()
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{
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return m_len;
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}
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void MyString::append(MyString str)
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{
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wcsncat(data, str.data, MAX_LEN - m_len - 1);
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m_len += wcslen(data + m_len);
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this->NullTerminate();
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}
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BOOLEAN
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MyString::append(const wchar_t *str)
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{
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BOOLEAN fDidCopy = FALSE;
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UINT Length = 0;
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if (str == NULL || (wcslen(str) + m_len > MAX_LEN + 1) )
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{
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return fDidCopy;
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}
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wcsncat(data, str, MAX_LEN - m_len - 1);
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m_len += wcslen(data);
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fDidCopy = TRUE;
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this->NullTerminate();
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return fDidCopy;
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}
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int compare(MyString firstStr, MyString secondStr)
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{
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return wcscmp(firstStr.wcharptr(), secondStr.wcharptr());
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}
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const wchar_t* MyString::c_str() const
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{
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return (data);
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}
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void MyString::Zero()
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{
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UINT i = 0;
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m_len = 0;
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for (i = 0; i < MAX_LEN; i++)
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{
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data[i] = 0;
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}
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}
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VOID
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MyString::NullTerminate()
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{
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if (data[m_len] != L'\0')
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{
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data[++m_len] = L'\0';
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}
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}
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