работа с буфером

histogram_internal.h

@@ -3,6 +3,6 @@
 #include <vector>
 #include <iostream>
 bool
-find_minmax(const std::vector<double> numbers, double& min, double& max);
+find_minmax(const std::vector<double>& numbers, double& min, double& max);
 
 #endif

main.cpp

@@ -1,31 +1,69 @@
+#include <curl/curl.h>
+#include <sstream>
+#include <string>
 #include "histogram.h"
 #include "text.h"
 #include <iostream>
 #include <vector>
 #include "svg.h"
+
+
 using namespace std;
 struct Input {
     vector<double> numbers;
     size_t bin_count{};
 };
 Input
-input_data(){
+input_data(istream& in,bool promt = false) {
     size_t number_count;
+    if (promt)
         cerr << "Number_count: ";
-    cin >> number_count;
-    Input in;
-    in.numbers.resize(number_count);
+    in >> number_count;
+    Input im;
+    im.numbers.resize(number_count);
     for (size_t i = 0; i < number_count; i++) {
-        cin >> in.numbers[i];
+        in >> im.numbers[i];
     }
+    if (promt)
         cerr << "Enter bin_count: ";
-    cin >> in.bin_count;
-    return in;
+    in >> im.bin_count;
+    return im;
+}
+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 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);
     }
-int
-main() {
-    auto in = input_data();
-    auto bins = make_histogram(in.numbers, in.bin_count);
+    auto bins = make_histogram(input.numbers, input.bin_count);
     show_histogram_svg(bins);
     return 0;
 }