#include <iostream>
#include <cstdlib>   //for the function getenv
#include <sstream>   //for class stringstream
#include "cgi.h"
using namespace std;

cgi::cgi()
{
	const char *const p {getenv("CONTENT_LENGTH")};
	if (p == nullptr) {
		cout << "Environment has no CONTENT_LENGTH\n";
		return;
	}
	const int n {stoi(p)};   //"string to integer"

	string s;
	s.resize(n);        //Make s big enough to hold all the data.
	cin.read(&s[0], n); //Read n bytes of data into s.

	if (!cin) {
		cout << "Unable to input " << n << " bytes.\n";
		return;
	}

	stringstream ss {s}; //We can use ss to read the characters from s.
	string line;

	while (getline(ss, line, '&')) {
		const size_t pos {line.find('=')};
		if (pos != std::string::npos) {   //If we found the '=',
			//The key is everything before the '=';
			//the value is everthing after the '='.
			const string key   {line.substr(0, pos)};
			const string value {line.substr(pos + 1)};
			m[key] = value;   //m.operator[](key) = value;
		}
	}
}