code: Выполнен общий вариант

main.cpp

@@ -1,4 +1,6 @@
 #include <curl/curl.h>
+#include <sstream>
+#include <string>
 #include <iostream>
 #include <vector>
 #include "histogram.h"
@@ -29,27 +31,47 @@ input_data(istream& in, bool prompt){
     return in1;
 }
 
-int
+static size_t
-main(int argc, char* argv[])
+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);
+    buffer->write(reinterpret_cast<const char*>(items), data_size);
+    return data_size;
+}
+
+Input
+download(const string& address) {
+    stringstream buffer;
+
     curl_global_init(CURL_GLOBAL_ALL);
-    if (argc > 1) {
     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);
         curl_easy_cleanup(curl);
         if (res != CURLE_OK) {
-                fprintf(stderr, "curl_easy_perform() failed: %s\n",
+            fprintf(stderr, "curl_easy_perform() failed: %s\n", curl_easy_strerror(res));
-                curl_easy_strerror(res));
             exit(1);
         }
     }
-        return 0;
+
+    return input_data(buffer, false);
 }
-    auto in = input_data(cin, false);
+
-    auto bins = make_histogram(in.numbers, in.bin_count);
+int
+main(int argc, char* argv[])
+{
+    Input input;
+    if (argc > 1) {
+        input = download(argv[1]);
+    } else {
+        input = input_data(cin, true);
+    }
+
+    const auto bins = make_histogram(input.numbers, input.bin_count);
     show_histogram_svg(bins);
     return 0;
 }