CStream.cpp

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/* +------------------------------------------------------------------------+
   |                     Mobile Robot Programming Toolkit (MRPT)            |
   |                          https://www.mrpt.org/                         |
   |                                                                        |
   | Copyright (c) 2005-2020, Individual contributors, see AUTHORS file     |
   | See: https://www.mrpt.org/Authors - All rights reserved.               |
   | Released under BSD License. See: https://www.mrpt.org/License          |
   +------------------------------------------------------------------------+ */

#include "io-precomp.h"  // Precompiled headers

#include <mrpt/core/exceptions.h>
#include <mrpt/core/reverse_bytes.h>
#include <mrpt/io/CStream.h>
#include <cstdarg>
#include <cstring>  // strlen()
#include <iostream>
#include <vector>

//#include "internal_class_registry.h"

using namespace mrpt;
using namespace mrpt::io;
using namespace std;

CStream::~CStream() = default;
/*---------------------------------------------------------------
            Writes an elemental data type to stream.
 ---------------------------------------------------------------*/
int CStream::printf(const char* fmt, ...)
{
    MRPT_START

    if (!fmt) throw std::runtime_error("fmt in CStream::printf cannot be NULL");

    int result = -1, length = 1024;
    vector<char> buffer;
    while (result == -1)
    {
        buffer.resize(length + 10);

        va_list args;  // This must be done WITHIN the loop
        va_start(args, fmt);
#if defined(_MSC_VER)
        result = ::vsnprintf_s(&buffer[0], length, _TRUNCATE, fmt, args);
#else
        result = ::vsnprintf(&buffer[0], length, fmt, args);
#endif
        va_end(args);

        // Truncated?
        if (result >= length) result = -1;
        length *= 2;
    }

    size_t l = strlen(&buffer[0]);
    this->Write(&buffer[0], (int)l);

    return result;

    MRPT_END
}

/*-------------------------------------------------------------
Reads from the stream until a '\n' character is found ('\r' characters are
ignored).
return false on EOF or any other read error.
-------------------------------------------------------------*/
bool CStream::getline(std::string& out_str)
{
    out_str.clear();
    try
    {
        for (;;)
        {
            size_t N = out_str.size();
            out_str.resize(N + 1);
            if (!Read(&out_str[N], 1)) return false;

            // New char read:
            if (out_str[N] == '\r')
            {
                out_str.resize(N);  // Ignore.
            }
            else if (out_str[N] == '\n')
            {
                out_str.resize(N);  // End of line!
                return true;  // Ok.
            }
        }
    }
    catch (...)
    {  // Any read error:
        return false;
    }
}