Exception.cpp

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#include "Exception.h"
#include "common/RenderTrace.h"
 
#include <iostream>
#include <cstdlib>
#include <cstdarg>
#include <cstring>
 
namespace eve
{
 
Exception::Exception(const char *fmt, ...)
{
    va_list args;
    int size_buffer = 256, size_out;
    char *buffer;
    while (true)
    {
        buffer = new char[size_buffer];
        memset(buffer, 0, size_buffer);
 
        va_start(args, fmt);
        size_out = vsnprintf(buffer, size_buffer, fmt, args);
        va_end(args);
 
        // see http://perfec.to/vsnprintf/pasprintf.c
        // if size_out ...
        //      == -1             --> output was truncated
        //      == size_buffer    --> output was truncated
        //      == size_buffer-1  --> ambiguous, /may/ have been truncated
        //       > size_buffer    --> output was truncated, and size_out
        //                            bytes would have been written
        if (size_out == size_buffer || size_out == -1 || size_out == size_buffer-1)
            size_buffer *= 2;
        else if (size_out > size_buffer)
            size_buffer = size_out + 2; // to avoid the ambiguous case
        else
            break;
 
        delete[] buffer;
    }
    message = std::string(buffer);
    delete[] buffer;
    // When DevTool/render tracer is active, mark the failure site for slicing.
    eve::debug::rtError(message.c_str());
}
 
Exception::~Exception() throw()
{
}
 
}