работа с буфером

main.cpp

@@ -1,4 +1,6 @@
 #include <curl/curl.h>
+#include <sstream>
+#include <string>
 #include "histogram.h"
 #include "text.h"
 #include <iostream>
@@ -27,17 +29,41 @@ input_data(istream& in,bool promt = false) {
     in >> im.bin_count;
     return im;
 }
-int main(int argc, char* argv[]) {
-    curl_global_init(CURL_GLOBAL_ALL);
-    if(argc > 1) {
-        cout << "argc = " << argc << endl;
-        for(int i = 0; i < argc; i++){
-            cout << "argv[" << i << "] = " << argv[i] << endl;
+size_t write_data(void* items, size_t item_size, size_t item_count, void* ctx){
+    stringstream* buffer = reinterpret_cast<stringstream*>(ctx);
+    size_t data_size = item_size * item_count;
+    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) {
+        curl_easy_setopt(curl, CURLOPT_URL, address.c_str());
+        curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_data);
+        curl_easy_setopt(curl, CURLOPT_WRITEDATA, &buffer);
+        CURLcode res = curl_easy_perform(curl);
+        curl_easy_cleanup(curl);
+        if(res != 0){
+            cerr << curl_easy_strerror(res);
+            exit(1);
         }
-        return 0;
     }
-    auto in = input_data(cin,true);
-    auto bins = make_histogram(in.numbers, in.bin_count);
+    return input_data(buffer, false);
+}
+
+int main(int argc, char* argv[]) {
+
+    curl_global_init(CURL_GLOBAL_ALL);
+
+    Input input;
+    if (argc > 1) {
+        input = download(argv[1]);
+    } else {
+        input = input_data(cin, true);
+    }
+    auto bins = make_histogram(input.numbers, input.bin_count);
     show_histogram_svg(bins);
     return 0;
 }