готовый собственный вариант

main.cpp

@@ -60,21 +60,26 @@ Input download(const string& address)
     if(curl)
     {
         CURLcode res;
+        double start;
+
         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);
         curl_easy_cleanup(curl);
-        if (res != 0)
+        if (res == CURLE_OK)
         {
-            cerr << curl_easy_strerror(res) << endl;
-            exit(1);
+            res = curl_easy_getinfo(curl, CURLINFO_STARTTRANSFER_TIME, &start);
+            if (CURLE_OK == res)
+            {
+                cerr<<"Time: " << start;
+            }
         }
-    }
 
-    curl_easy_cleanup(curl);
+        curl_easy_cleanup(curl);
 
-    return input_data(buffer, false);
+        return input_data(buffer, false);
+    }
 }
 
 
@@ -111,11 +116,15 @@ Input download(const string& address)
     return 0;
 } */
 
-int main(int argc, char* argv[]) {
+int main(int argc, char* argv[])
+{
     Input input;
-    if (argc > 1) {
+    if (argc > 1)
+    {
         input = download(argv[1]);
-    } else {
+    }
+    else
+    {
         input = input_data(cin, true);
     }