CString.h

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/****
 * Sming Framework Project - Open Source framework for high efficiency native ESP8266 development.
 * Created 2015 by Skurydin Alexey
 * http://github.com/SmingHub/Sming
 * All files of the Sming Core are provided under the LGPL v3 license.
 *
 * CString.h
 *
 * @author: 2020 - Mikee47 <mike@sillyhouse.net>
 *
 ****/

#pragma once

#include <WString.h>
#include <memory>

class CString : public std::unique_ptr<char[]>
{
public:
    CString() = default;

    CString(const CString& src) = default;

    CString(const String& src)
    {
        assign(src);
    }

    void assign(const String& src)
    {
        if(src) {
            assign(src.c_str(), src.length());
        } else {
            reset();
        }
    }

    void assign(const char* src)
    {
        assign(src, src ? strlen(src) : 0);
    }

    void assign(const char* src, size_t len)
    {
        if(src == nullptr || len == 0) {
            reset();
        } else {
            ++len;
            reset(new char[len]);
            memcpy(get(), src, len);
        }
    }

    CString& operator=(const String& src)
    {
        assign(src);
        return *this;
    }

    CString& operator=(const char* src)
    {
        assign(src);
        return *this;
    }

    char* begin()
    {
        return get();
    }

    const char* c_str() const
    {
        return get() ?: "";
    }

    bool operator==(const CString& other) const
    {
        return strcmp(c_str(), other.c_str()) == 0;
    }

    bool operator==(const String& other) const
    {
        return strcmp(c_str(), other.c_str()) == 0;
    }

    size_t length() const
    {
        auto p = get();
        return p ? strlen(p) : 0;
    }

    explicit operator String() const
    {
        return get();
    }
};