Обработка ошибок

main.cpp

@@ -37,9 +37,11 @@ Input input_data(std::istream& in, bool prompt)
     return data;
 }
 
-int main(int argc, char* argv[]){
+int main(int argc, char* argv[])
+{
     curl_global_init(CURL_GLOBAL_ALL);
     using namespace std;
+
     if (argc > 1)
     {
         const char *url = argv[1];
@@ -49,11 +51,18 @@ int main(int argc, char* argv[]){
         {
             curl_easy_setopt(curl, CURLOPT_URL, url);
             curl_easy_perform(curl);
+
+            CURLcode res = curl_easy_perform(curl);
+            if (res != CURLE_OK)
+            {
+                cerr << "curl_easy_perform() failed: " << curl_easy_strerror(res) << endl;
+                exit(1);
+            }
             curl_easy_cleanup(curl);
-            return 0;
         }
         return 0;
     }
+
     auto in = input_data(cin,true);
     auto bins = make_histogram(in.bin_count, in.numbers);
     show_histogram_svg(bins);