code: сохранение данных в буфер

main.cpp

@@ -1,6 +1,7 @@
 #include <curl/curl.h>
 #include <iostream>
 #include <vector>
+#include <sstream>
 #include "histogram.h"
 #include "text.h"
 #include "svg.h"
@@ -35,25 +36,46 @@ Input input_data(istream& stream, bool prompt)
     return in;
 }
 
-int main(int argc, char* argv[])
-{
-    if (argc > 1){
+size_t write_data(void* items, size_t item_size, size_t item_count, void* ctx) {
+    size_t data_size = item_count * item_size;
+    stringstream* buffer = reinterpret_cast<stringstream*>(ctx);
+    char *item = reinterpret_cast<char *>(items);
+    buffer->write(item, data_size);
+
+    return data_size;
+}
+
+
+Input download(const string& address) {
+    stringstream buffer;
         curl_global_init(CURL_GLOBAL_ALL);
         CURL *curl = curl_easy_init();
-        if(curl) {
+        if(curl)
+        {
             CURLcode res;
-            curl_easy_setopt(curl, CURLOPT_URL, argv[1]);
+            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 != CURLE_OK){
+            if (res != CURLE_OK)
+            {
                 cerr << 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);
     }
-    bool prompt = true;
-    auto in = input_data(cin, prompt);
-    auto bins = make_histogram(in.numbers, in.bin_count);
+
+    const auto bins = make_histogram(input.numbers, input.bin_count);
     show_histogram_svg(bins);
 }