code: сохранение данных из сети в буфер

main.cpp

@@ -1,4 +1,6 @@
 #include <curl/curl.h>
+#include <sstream>
+#include <string>
 #include <iostream>
 #include <vector>
 #include "histogram.h"
@@ -46,25 +48,44 @@ Input input_data(istream& in, bool promt)
     }
 }
 
-int main(int argc, char* argv[])
+size_t write_data(void* items, size_t item_size, size_t item_count, void* ctx)
 {
-    if (argc > 1){
+    size_t data_size = item_size*item_count;
+    stringstream* buffer = reinterpret_cast<stringstream*>(ctx);
+    buffer->write(reinterpret_cast<const char*>(items), data_size);
+    return data_size;
+}
+
+Input download(const string& address)
+{
+    stringstream buffer;
     CURL* curl = curl_easy_init();
     if(curl) {
         CURLcode res;
-            curl_easy_setopt(curl, CURLOPT_URL, "//uit.mpei.ru/study/courses/cs/lab03/marks.txt");
+        curl_easy_setopt(curl, CURLOPT_URL, address.c_str());
+        curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_data);
+        curl_easy_setopt(curl, CURLOPT_WRITEDATA, &buffer);
         res = curl_easy_perform(curl);
-            if (res != '0'){
+        if (res != 0){
             cout << curl_easy_strerror(res);
             exit(1);
         }
         curl_easy_cleanup(curl);
     }
-        return 0;
+    return input_data(buffer,false);
+}
+
+
+int main(int argc, char* argv[])
+{
+    Input input;
+    if (argc > 1){
+        input = download(argv[1]);
+    }
+    else{
+        input = input_data(cin,true);
     }
-    curl_global_init(CURL_GLOBAL_ALL);
+    const auto bins = make_histogram(input.numbers, input.bin_count);
-    auto in = input_data(cin,true);
-    auto bins = make_histogram(in.numbers, in.bin_count);
     show_histogram_svg(bins);
     return 0;
 }