4.6: сохранение данных из сети в буфер

main.cpp

@@ -4,6 +4,8 @@
 #include "text.h"
 #include "svg.h"
 #include <curl/curl.h>
+#include <sstream>
+#include <string>
 
 using namespace std;
 
@@ -43,19 +45,28 @@ Input input_data(istream& stream, bool prompt) {
     return in;
 }
 
+size_t write_data(void* items, size_t item_size, size_t item_count, void* ctx) {
+    size_t data_size = item_size * item_count;
+    stringstream* buffer = reinterpret_cast<stringstream*>(ctx);
+    auto text = reinterpret_cast<const char*>(items);
+    buffer->write(text, data_size);
+    return data_size;
+}
 
+Input download(const string& address) {
 
+    stringstream buffer;
 
-int main(int argc, char* argv[]){
-
-    if (argc > 1){
+    curl_global_init(CURL_GLOBAL_ALL);
 
         CURL* curl = curl_easy_init();
 
         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) {
@@ -64,14 +75,21 @@ int main(int argc, char* argv[]){
             }
             curl_easy_cleanup(curl);
         }
-        return 0;
+    return input_data(buffer, false);
 }
 
-    curl_global_init(CURL_GLOBAL_ALL);
 
-    bool prompt= true;
 
-    Input in = input_data(cin, prompt);
+
+int main(int argc, char* argv[]){
+
+    Input in;
+    if (argc > 1) {
+        in = download(argv[1]);
+    } else {
+        in = input_data(cin, true);
+    }
+
 
     auto bins = make_histogram(in.numbers, in.bin_count);