After getting familiar with C syntax by solving Project Euler Problems, I want to get something "useful" done for the first time.
A Mastermind clone seemed simple enough, and below you can check the current status. I know that some open issues are still pending (for example filtering the raw user input etc.), but at least it seems to work ok so far.
I only have FreeBSD on my Laptop, so I can't test if it works on Linux or with Cygwin, but I hope it does.
Any tips, suggestions, etc., are welcome.
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <termios.h>
#include <time.h>
#include <string.h>
#define VERSION "0.2"
#define MAXOPTIONS 4
struct termios saved_attributes;
void reset_input_mode(void);
void set_raw_mode(void);
void evaluate(char* set, int digits, int spots, int guesses, int timelimit);
void new_game(int digits, int spots, int guesses, int timelimit);
void custom_game(void);
void menu(void);
// Reset terminal to the state it had before
void reset_input_mode(void) {
tcsetattr (STDIN_FILENO, TCSANOW, &saved_attributes);
}
// Set terminal to raw mode
void set_raw_mode(void) {
struct termios tattr;
char *name;
if (!isatty (STDIN_FILENO)) {
fprintf (stderr, "Not a terminal.\n");
exit (EXIT_FAILURE);
}
tcgetattr (STDIN_FILENO, &saved_attributes);
atexit (reset_input_mode);
tcgetattr (STDIN_FILENO, &tattr);
tattr.c_lflag &= ~(ICANON);
tattr.c_cc[VMIN] = 1;
tattr.c_cc[VTIME] = 0;
tcsetattr (STDIN_FILENO, TCSAFLUSH, &tattr);
}
// Evaluate useres guess
void evaluate(char* set, int digits, int spots, int guesses, int timelimit) {
char* guess = (char*)malloc(spots * sizeof(char));
char* found = (char*)malloc(spots * sizeof(char));
int correct = 0, semi;
int guesscount = guesses == 0 ? 1 : 0;
time_t start = time(NULL);
while (correct < spots && guesses != guesscount) {
if (timelimit > 0 && timelimit < (int)(time(NULL) - start)) {
timelimit = 0;
break;
}
correct = 0;
semi = 0;
guesscount++;
memcpy(found, set, sizeof(set));
for (int i = 0; i < spots; i++) {
read(STDIN_FILENO, &guess[i], 1);
guess[i] -= '0';
if (guess[i] == set[i]) {
correct++;
found[i] = 99;
}
}
for (int i = 0; i < spots; i++)
for (int j = 0; j < spots; j++)
if (guess[i] == found[j]) {
found[j] = 99;
semi++;
}
printf(" | ");
for (int i = 0; i < correct; i++)
printf("○ ");
for (int i = 0; i < semi; i++)
printf("● ");
printf("\n");
}
free(found);
free(guess);
if (correct == spots) {
printf("Congratulations! You solved the puzzle in ");
printf("%d seconds, ", (int)(time(NULL) - start));
printf("using %d guesses.\n\n", guesses == 0 ? --guesscount : guesscount);
}
else if (timelimit == 0)
printf("Sorry, time's up!\n\n");
else
printf("Sorry, you didn't solve the puzzle within %d guesses.\n\n", guesscount);
}
// Start a new game
void new_game(int digits, int spots, int guesses, int timelimit) {
char* set = (char*)malloc(spots * sizeof(char));
for (int i = 0; i < spots; i++) {
set[i] = (1 + rand() % digits) % 10;
}
printf("Please enter your first guess:\n\n");
set_raw_mode();
evaluate(set, digits, spots, guesses, timelimit);
free(set);
}
// Get parameters for a new game with custom settings
void custom_game(void) {
int digits, spots, guesses, timelimit;
printf("\nPlease enter the number of possible digits (2-10): ");
scanf("%d", &digits);
while (digits < 2 || digits > 10) {
printf("Invalid number of digits, please enter a number from 2 to 10: ");
scanf("%d", &digits);
}
printf("\nPlease enter the number of spots (2-10): ");
scanf("%d", &spots);
while (spots < 2 || spots > 10) {
printf("Invalid number of spots, please enter a number from 2 to 10: ");
scanf("%d", &spots);
}
printf("\nPlease enter the number of guesses (0 for unlimited): ");
scanf("%d", &guesses);
while (guesses < 0) {
printf("Invalid number of guesses, please enter a positive number (or 0 for unlimited): ");
scanf("%d", &guesses);
}
printf("\nPlease enter the time limit in seconds (0 for unlimited): ");
scanf("%d", &timelimit);
while (timelimit < 0) {
printf("Invalid time limit, please enter a positive number (or 0 for unlimited): ");
scanf("%d", &timelimit);
}
new_game(digits, spots, guesses, timelimit);
}
// Display the menu and get user's choice
void menu(void) {
char c = 0;
printf("+-----------------------------------------------------------------------------+\n");
printf("| Main menu - Enter your choice as a number from 1 to %d |\n", MAXOPTIONS);
printf("+-----------------------------------------------------------------------------+\n");
printf("| 1 - New game in Classic mode (6 digits, 4 spots, 12 guesses, no time limit) |\n");
printf("| 2 - New game in \"Super\" mode (8 digits, 5 spots, 12 guesses, no time limit) |\n");
printf("| 3 - New game with custom settings |\n");
printf("| 4 - Quit (You can exit anytime by pressing Ctrl+C) |\n");
printf("+-----------------------------------------------------------------------------+\n\n");
printf("-> ");
while(!c) {
c = getchar();
switch (c) {
case '1': new_game(6, 4, 12, 0); break;
case '2': new_game(8, 5, 12, 0); break;
case '3': custom_game(); break;
case '4': exit(0); break;
default: {
printf("Invalid option, please enter a number from 1 to %d\n-> ", MAXOPTIONS);
while((c = getchar()) != '\n' && c != EOF);
c = 0;
}
break;
}
}
}
int main(int argc, char **argv) {
srand(time(NULL));
printf("\nWelcome to Mastermind_C version %s\n\n", VERSION);
menu();
return EXIT_SUCCESS;
}
timelimit < (int)(time(NULL) - start). If pedantic, use(time_t) timelimit < time(NULL) - start)\$\endgroup\$