code: добавлены write_data, download

.gitignore

@@ -5,3 +5,4 @@
 /main.exe
 /main.o
 /unittest.layout
+/curl

cs-lab34.cbp

@@ -31,7 +31,12 @@
 		<Compiler>
 			<Add option="-Wall" />
 			<Add option="-fexceptions" />
+			<Add directory="curl/include" />
 		</Compiler>
+		<Linker>
+			<Add library="curl/lib/libcurl.dll.a" />
+			<Add directory="curl/lib" />
+		</Linker>
 		<Unit filename=".gitignore" />
 		<Unit filename="histogram.cpp" />
 		<Unit filename="histogram.h" />

main.cpp

@@ -1,3 +1,7 @@
+#include <curl/curl.h>
+
+#include <sstream>
+#include <string>
 #include "histogram.h"
 #include "text.h"
 #include "svg.h"
@@ -6,7 +10,6 @@ struct Input {
     vector<double> vec;
     size_t korz{};
 };
-
 Input input_data(istream& in, bool prompt = false) {
     Input lin;
     size_t n, korz;
@@ -22,9 +25,62 @@ Input input_data(istream& in, bool prompt = false) {
     return lin;
 }
 
-int main() {
-
-    auto in = input_data(cin, true);
-    auto bins = make_histogram(in.korz, in.vec);
-    show_histogram_svg(bins);
+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 != CURLE_OK) {
+            cerr << "cURL error: " << curl_easy_strerror(res) << endl;
+            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);
+    }
+    auto bins = make_histogram(input.korz, input.vec);
+    show_histogram_svg(bins);
+    return 0;
+}
+
+//Ïîëó÷åíèå àðãóìåíòîâ êîìàíäû. Ñóòü â òîì, ÷òî êàæäûé àðãóìåíò (ïîòîê ñèìâîëîâ) èìååò ñâîé ïîðÿäêîâûé íîìåð.
+//×òîáû ïðîãðàììà ìîëãà âîñïðèíèìàòü àðãóìåíòû è êîìàíäû òàê, êàê íàäî, àðãóìåíòû, êàê è ñëîâà â ëþáîì ÿçûêå, ðàçäåëÿþòñÿ ïðîáåëàìè.
+// íàøåì ñëó÷àå ïðîãðàììà ïîêàçûâàåò, êàêîé ïîðÿäêîâûé íîìåð èìååò êàæäîå ñëîâî ñ ïîìîùüþ ïðîáåëîâ.
+//Äëÿ NUL íè÷åãî íå âûâåäåòñÿ òàê êàê ìû âûâåëè èòîãîâûé ïîòîê â íèêóäà.
+
+/*
+C:\Users\Natasha\Desktop\Ïðîãè Ñ2\cs-lab34\bin\Debug>cs-lab34.exe -x --y /z w
+argc = 5
+argv[0] = cs-lab34.exe
+argv[1] = -x
+argv[2] = --y
+argv[3] = /z
+argv[4] = w
+
+C:\Users\Natasha\Desktop\Ïðîãè Ñ2\cs-lab34\bin\Debug>cs-lab34.exe param "with spaces"
+argc = 3
+argv[0] = cs-lab34.exe
+argv[1] = param
+argv[2] = with spaces
+
+C:\Users\Natasha\Desktop\Ïðîãè Ñ2\cs-lab34\bin\Debug>cs-lab34.exe param <marks.txt >NUL
+*/