Secrets to macros and c string concat at compile time

Joel Grunbaum

2022-01-20 128c6d51ec8c70e230dc86b100cb887ba3f0378d

 bom.cpp

@@ -1,49 +1,57 @@
#include "bom.hpp"

#include "book.hpp"
#include "ftplibpp/ftplib.h"
#include "rapidxml/rapidxml.hpp"
#include <cstddef>
#include <cstdio>
#include <curl/curl.h>
#include <stdio.h>
#include <fstream>
#include <iterator>
#include <string>
#include <unordered_map>
#include <vector>

namespace bom
{
ftplib* ftp;

static size_t my_fwrite(void* buffer, size_t size, size_t nmemb, void* stream)
void initialise()
{
   FILE* out = (FILE*)stream;
   if (!out) {
      out = tmpfile();
      if (!out) {
         return -1;
      }
   }
   return fwrite(buffer, size, nmemb, out);
   ftp = new ftplib();
   ftp->Connect("ftp.bom.gov.au:21");
   ftp->Login("anonymous", "");
}

void destroy()
{
   ftp->Quit();
   delete ftp;
}

void updateBom(std::unordered_map<std::string, book::Book>& bs)
{
   CURL* curl;
   CURLcode res;
   FILE* f{NULL};
   curl_global_init(CURL_GLOBAL_DEFAULT);
   curl = curl_easy_init();
   if (curl) {
      curl_easy_setopt(curl, CURLOPT_URL,
                       "ftp://ftp.bom.gov.au/anon/gen/fwo/IDN60920.xml");
      curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, my_fwrite);
      curl_easy_setopt(curl, CURLOPT_WRITEDATA, &f);
      curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L);
      res = curl_easy_perform(curl);
      curl_easy_cleanup(curl);
      if (CURLE_OK != res) {
         fprintf(stderr, "Curl failed: %d\n", res);
   ftp->Get("bom_data.xml", "/anon/gen/fwo/IDN60920.xml",
            ftplib::transfermode::ascii);
   std::ifstream fs("bom_data.xml");
   std::vector<char> buffer{std::istreambuf_iterator<char>(fs),
                            istreambuf_iterator<char>()};
   buffer.push_back('\0');
   rapidxml::xml_document<> d;
   d.parse<0>(&buffer[0]);
   // Walk stations
   for (rapidxml::xml_node<>* n = d.first_node()->last_node()->first_node(); n;
        n = n->next_sibling()) {
      int bom_id = std::stoi(n->first_attribute()->next_attribute()->value());
      for (auto& i : bs) {
         if (i.second.stationId == bom_id) {
            // Should be apparent temp
            i.second.bomPrice = std::stod(n->first_node()
                                              ->first_node()
                                              ->first_node()
                                              ->first_node()
                                              ->value());
         }
      }
   }
   if (f) {
      fclose(f);
   }
   curl_global_cleanup();
}
} // namespace bom