Given the following code containing errors, provide Common Weakness Enumeration (CWE) identifiers and corresponding messages in JSON format. Each identified weakness should have a unique entry in the JSON array.
    Code: ArgParser::checkCompletion()
{
    // See if we're being invoked from bash completion.
    std::string bash_point_env;
    if (QUtil::get_env("COMP_LINE", &bash_line) &&
        QUtil::get_env("COMP_POINT", &bash_point_env))
    {
        int p = QUtil::string_to_int(bash_point_env.c_str());
        if ((p > 0) && (p <= static_cast<int>(bash_line.length())))
        {
            // Truncate the line. We ignore everything at or after the
            // cursor for completion purposes.
            bash_line = bash_line.substr(0, p);
        }
        // Set bash_cur and bash_prev based on bash_line rather than
        // relying on argv. This enables us to use bashcompinit to get
        // completion in zsh too since bashcompinit sets COMP_LINE and
        // COMP_POINT but doesn't invoke the command with options like
        // bash does.

        // p is equal to length of the string. Walk backwards looking
        // for the first separator. bash_cur is everything after the
        // last separator, possibly empty.
        char sep(0);
        while (--p > 0)
        {
            char ch = bash_line.at(p);
            if ((ch == ' ') || (ch == '=') || (ch == ':'))
            {
                sep = ch;
                break;
            }
        }
        bash_cur = bash_line.substr(1+p, std::string::npos);
        if ((sep == ':') || (sep == '='))
        {
            // Bash sets prev to the non-space separator if any.
            // Actually, if there are multiple separators in a row,
            // they are all included in prev, but that detail is not
            // important to us and not worth coding.
            bash_prev = bash_line.substr(p, 1);
        }
        else
        {
            // Go back to the last separator and set prev based on
            // that.
            int p1 = p;
            while (--p1 > 0)
            {
                char ch = bash_line.at(p1);
                if ((ch == ' ') || (ch == ':') || (ch == '='))
                {
                    bash_prev = bash_line.substr(p1 + 1, p - p1 - 1);
                    break;
                }
            }
        }
        if (bash_prev.empty())
        {
            bash_prev = bash_line.substr(0, p);
        }
        if (argc == 1)
        {
            // This is probably zsh using bashcompinit. There are a
            // few differences in the expected output.
            zsh_completion = true;
        }
        handleBashArguments();
        bash_completion = true;
    }
} ; Sample JSON Format Confermily Expected output: "examples" => "cwe": "xxx"; "message": "xxx"
    
 'cwe': ['CWE-787'], 'message': 'Fix sign and conversion warnings (major)

This makes all integer type conversions that have potential data loss
explicit with calls that do range checks and raise an exception. After
this commit, qpdf builds with no warnings when -Wsign-conversion
-Wconversion is used with gcc or clang or when -W3 -Wd4800 is used
with MSVC. This significantly reduces the likelihood of potential
crashes from bogus integer values.

There are some parts of the code that take int when they should take
size_t or an offset. Such places would make qpdf not support files
with more than 2^31 of something that usually wouldn't be so large. In
the event that such a file shows up and is valid, at least qpdf would
raise an error in the right spot so the issue could be legitimately
addressed rather than failing in some weird way because of a silent
overflow condition.'