分离Cookie各条目

#include <iostream>
#include <map>
#include <string>
#include <vector>

std::string TestCookie{"ID=1; TT=2\r\n"};

void SplitCookie(std::string_view Cookie) {
  int err = 0;
  std::vector<std::string> items;
  std::map<std::string, std::string> values;
  std::string CookieString{Cookie};
  CookieString.erase(std::remove_if(CookieString.begin(), CookieString.end(),
                                    [](char c) -> bool {
                                      if (c == '\r' || c == '\n' || c == ' ')
                                        return true;
                                      return false;
                                    }),
                     CookieString.end());

  size_t lastpos = 0;

  while (lastpos < CookieString.length()) {
    size_t curpos = CookieString.find(';', lastpos);
    if (curpos == std::string::npos) {
      if (lastpos < CookieString.length())
        items.push_back(CookieString.substr(lastpos));
      break;
    }
    items.push_back(CookieString.substr(lastpos, curpos - lastpos));
    lastpos = curpos + 1;
  }
  for (auto &item : items) {
    size_t pos = item.find('=');
    if (pos == std::string::npos) {
      err = -1;
      break;
    }
    if (pos == 0 || pos == item.length() - 1) {
      err = -2;
      break;
    }
    std::string name{item.substr(0, pos)};
    std::string value{item.substr(pos + 1)};
    if (values.find(name) != values.end()) {
      err = -3;
      break;
    }
    values[name] = value;
  }
  if (err != 0)
    values.clear();
}

int main(int argc, char *argv[]) {
  SplitCookie(TestCookie);
  return 0;
}