code: Сохранение данных из сети в буфер

.gitignore

@@ -1,3 +1,4 @@
+/curl
 /bin
 /obj
 *.layout

main.cpp

@@ -6,46 +6,96 @@
 #include "histogram.h"
 #include "text.h"
 #include "svg.h"
+#include <curl/curl.h>
+#include <sstream>
+#include <string>
+
 using namespace std;
 
 //Ñîçäàíèå ñòðóêòóðû Input äëÿ âõîäíûõ äàííûõ
-	struct Input {
-        vector<double> Numbers;
-        size_t bin_count{};
-    };
+struct Input
+{
+    vector<double> Numbers;
+    size_t bin_count{};
+};
 
 //Ôóíêöèÿ ââîäà
-Input input_data(){
+Input input_data(istream& in, bool prompt)
+{
     size_t number_count;
     Input stct;
     //Ââîä êîëè÷åñòâà ýëåìåíòîâ ìàññèâà
-    cerr << "Enter number count ";
-	cin >> number_count;
+    if (prompt)
+    {
+        cerr << "Enter number count ";
+    }
+    in >> number_count;
     //Ââîä ìàññèâà
-	vector<double> Numbers(number_count);
-	stct.Numbers.resize(number_count);
-	cerr << "Enter array:\n";
-	cin >> stct.Numbers[0];
-	for (int i = 1; i < number_count; i++) {
-		cin >> stct.Numbers[i];
-	}
-	//Ââîä êîëè÷åñòâà êîðçèí
-	cerr << "Enter bin count\n";
-	cin >> stct.bin_count;
-	//Âîçâðàùàåì ñòðóêòóðó
-	return stct;
+    vector<double> Numbers(number_count);
+    stct.Numbers.resize(number_count);
+    if (prompt)
+    {
+        cerr << "Enter array:\n";
+    }
+    in >> stct.Numbers[0];
+    for (int i = 1; i < number_count; i++)
+    {
+        in >> stct.Numbers[i];
+    }
+    //Ââîä êîëè÷åñòâà êîðçèí
+    if (prompt)
+    {
+        cerr << "Enter bin count\n";
+    }
+    in >> stct.bin_count;
+    //Âîçâðàùàåì ñòðóêòóðó
+    return stct;
+}
+
+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(items, data_size);
+    (*buffer).write(reinterpret_cast<const char*>(items), data_size);
+    return data_size;
 }
 
-int main() {
-	//Ââîä ìàññèâà è êîëè÷åñòâà êîðçèí
-	Input in = input_data();
+Input
+download(const string& address)
+{
+    stringstream buffer;
+
+    CURL *curl = curl_easy_init();
+    if(curl)
+    {
+        CURLcode res;
+        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)
+        {
+            cerr << curl_easy_strerror(res);
+            exit(1);
+        }
+        curl_easy_cleanup(curl);
+    }
+    return input_data(buffer, false);
+}
 
-	//Ñîçäàíèå âåêòîðà bins äëÿ ãèñòîãðàììû
-	vector<size_t> bins = make_histogram(in.Numbers, in.bin_count);
 
-	//Âûâîä ãèñòîãðàììû
-	show_histogram_svg(bins);
-	//show_histogram_text(bins);
+int
+main(int argc, char* argv[]) {
+    Input input;
+    if (argc > 1) {
+        input = download(argv[1]);
+    } else {
+        input = input_data(cin, true);
+    }
 
-	return 0;
+    const auto bins = make_histogram(input.Numbers, input.bin_count);
+    show_histogram_svg(bins);
 }