string to argv/agrc for testing purposes (doesn't handle one quote correctly)

str2argv.h

std::vector<char*>
str2argv(std::string& str)
{
	std::vector<char*> rs;
	bool was_space = true;
	bool in_quotes = false;
	for (size_t i = 0; i < str.length(); ++i)
	{
		if (std::isspace(str[i]) && !in_quotes)
		{
			if (!was_space)
				was_space = true;
			str[i] = 0;
			continue;
		}

		if (str[i] == '\'' || str[i] == '"')
		{
			str[i] = 0;
			if (in_quotes)
			{
				was_space = true;
				in_quotes = false;
				continue;
			}
			in_quotes = true;
			rs.emplace_back(const_cast<char*>(str.c_str()) + i + 1);
			was_space = false;
			continue;
		}

		if (!was_space)
			continue;

		rs.emplace_back(const_cast<char*>(str.c_str()) + i);
		was_space = false;
	}
	return rs;
}