cs-lab34/main.cpp

#include <iostream>
#include <sstream>
#include <string>
#include <vector>
#include <curl/curl.h>
#include "histogram.h"
#include "text.h"
#include "svg.h"

using namespace std;

struct Input {
    vector<double> numbers;
    size_t bin_count{};
};

Input input_data(istream& in, bool prompt) {
    if (prompt) {
        cerr << "Enter number count, numbers and bin count: ";
    }

    size_t number_count;
    in >> number_count;

    Input input;
    input.numbers.resize(number_count);

    for (size_t i = 0; i < number_count; i++) {
        in >> input.numbers[i];
    }

    in >> input.bin_count;

    return input;
}

size_t 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* 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);
        if (res != CURLE_OK) {
            cerr << "cURL error: " << curl_easy_strerror(res) << endl;
            curl_easy_cleanup(curl);
            exit(1);
        }

        curl_easy_cleanup(curl);
    } else {
        cerr << "curl_easy_init() failed" << endl;
        exit(1);
    }

    return input_data(buffer, false);
}

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;
}