opts.cpp

Go to the documentation of this file.

 
#include <iostream>
#include <unistd.h>
#include <stdlib.h>
 
#include "opts.h"
#include "settings.h"
 
void usage(std::ostream &out, const char **argv)
{
    out
        << "Usage: " << argv[0] << " [OPTIONS]"             << std::endl
                                                            << std::endl
        << "  A flexible engine for imaginary quartet!"     << std::endl
                                                            << std::endl
        << "Note:"                                          << std::endl
        << "  To ensure an equal distribution of the cards" << std::endl
        << "  we enforce: (n * s) mod p == 0."              << std::endl
                                                            << std::endl
        << "Options:"                                       << std::endl
        << "  -s [int]    Size of one set.   [default: "    << DEFAULT_SET_SIZE    << "]" << std::endl
        << "  -n [int]    Number of sets.    [default: "    << DEFAULT_NUM_SETS    << "]" << std::endl
        << "  -p [int]    Number of players. [default: "    << DEFAULT_NUM_PLAYERS << "]" << std::endl
        << "  -h          Show this help and exit."         << std::endl;
 
}
 
bool valid(const Settings &settings, const char **argv)
{
    if (settings.SET_SIZE < 1) {
        std::cerr << argv[0] << ": the size of one set has to be at least one" << std::endl;
        return false;
    }
 
    if (settings.NUM_SETS < 1) {
        std::cerr << argv[0] << ": the number of sets has to be at least one" << std::endl;
        return false;
    }
 
    if (settings.NUM_PLAYERS < 2) {
        std::cerr << argv[0] << ": the number of players has to be at least two" << std::endl;
        return false;
    }
 
    if ((settings.NUM_SETS * settings.SET_SIZE) % settings.NUM_PLAYERS != 0) {
        std::cerr << argv[0] << ": enforces (n * s) mod p == 0" << std::endl;
        return false;
    }
 
    return true;
}
 
Settings options(const int argc, const char **argv)
{
    int SET_SIZE = DEFAULT_SET_SIZE;
    int NUM_SETS = DEFAULT_NUM_SETS;
    int NUM_PLAYERS = DEFAULT_NUM_PLAYERS;
 
    int opt;
    while ((opt = getopt(argc, (char* const*)argv, "s:n:p:h")) != -1) {
        switch (opt) {
            case 's':
                SET_SIZE = atoi(optarg);
                break;
            case 'n':
                NUM_SETS = atoi(optarg);
                break;
            case 'p':
                NUM_PLAYERS = atoi(optarg);
                break;
            case 'h':
                usage(std::cout, argv);
                exit(EXIT_SUCCESS);
            default:  // '?'
                usage(std::cerr, argv);
                exit(EXIT_FAILURE);
        }
    }
 
    Settings settings = {SET_SIZE, NUM_SETS, NUM_PLAYERS};
    if (!valid(settings, argv)) {
        usage(std::cerr, argv);
        exit(EXIT_FAILURE);
    }
    return settings;
}