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naval.c
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naval.c
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#define PLAYER 1
#define CPU 2
#define GIVEUP 3
#define NONE 0
#define MISS -1
#define HIT -2
#define MAX 26
int cpuBoard[MAX][MAX]; //initialises 2D array for the cpu board
int playerBoard[MAX][MAX]; //initialises 2D array for the player board
// Assigns exit codes to error codes
enum Errors {
E_NOT_ENOUGH_PARAMETERS = 10,
E_RULES_MISSING = 20,
E_PLAYER_MAP_MISSING = 30,
E_CPU_MAP_MISSING = 31,
E_CPU_TURNS_MISSING = 40,
E_RULES = 50,
E_PLAYER_SHIP_OVERLAP = 60,
E_CPU_SHIP_OVERLAP = 70,
E_PLAYER_MAP_OOB = 80,
E_CPU_MAP_OOB = 90,
E_PLAYER_MAP = 100,
E_CPU_MAP = 110,
E_TURNS = 120,
E_PLAYER_GIVES_UP = 130,
E_CPU_GIVES_UP = 140
};
/* Prints the error message to stdout and exits with the exit code correspon
* ding to the error code parameter.
*
* @param (int code) (enumerator value corresponding to the error code)
*/
void error_exit(int code)
{
switch (code) {
case E_NOT_ENOUGH_PARAMETERS:
fprintf(stderr, "Usage: naval rules playermap cpumap turns\n");
exit(10);
case E_RULES_MISSING:
fprintf(stderr, "Missing rules file\n");
exit(20);
case E_PLAYER_MAP_MISSING:
fprintf(stderr, "Missing player map file\n");
exit(30);
case E_CPU_MAP_MISSING:
fprintf(stderr, "Missing CPU map file\n");
exit(31);
case E_CPU_TURNS_MISSING:
fprintf(stderr, "Missing CPU turns file\n");
exit(40);
case E_RULES:
fprintf(stderr, "Error in rules file\n");
exit(50);
case E_PLAYER_SHIP_OVERLAP:
fprintf(stderr, "Overlap in player map file\n");
exit(60);
case E_CPU_SHIP_OVERLAP:
fprintf(stderr, "Overlap in CPU map file\n");
exit(70);
case E_PLAYER_MAP_OOB:
fprintf(stderr, "Out of bounds in player map file\n");
exit(80);
case E_CPU_MAP_OOB:
fprintf(stderr, "Out of bounds in CPU map file\n");
exit(90);
case E_PLAYER_MAP:
fprintf(stderr, "Error in player map file\n");
exit(100);
case E_CPU_MAP:
fprintf(stderr, "Error in CPU map file\n");
exit(110);
case E_TURNS:
fprintf(stderr, "Error in turns file\n");
exit(120);
case E_PLAYER_GIVES_UP:
fprintf(stderr, "Bad guess\n");
exit(130);
case E_CPU_GIVES_UP:
fprintf(stderr, "CPU player gives up\n");
exit(140);
default:
exit(0);
}
}
/* Initialises an empty cpu board.
*
* @param (int width) (width of the board)
* @param (int height) (height of the board)
*/
void initialise_cpu_board(int width, int height)
{
for (int i = 1; i < (height + 1); i++) {
for (int j = 1; j < (width + 1); j++) {
cpuBoard[i][j] = NONE;
}
}
}
/* Initialises an empty player board.
*
* @param (int width) (width of the board)
* @param (int height) (height of the board)
*/
void initialise_player_board(int width, int height)
{
for (int i = 1; i < (height + 1); i++) {
for (int j = 1; j < (width + 1); j++) {
playerBoard[i][j] = NONE;
}
}
}
/* Reads one line of the provided file and returns it.
*
* @param (FILE* file) (filename of the file to be read)
*
* @return (char* result) (the line read as a string)
*/
char* read_line(FILE* file)
{
char* result = malloc(sizeof(char) * 80);
int position = 0;
int next = 0;
while (1) {
next = fgetc(file);
if (next == '#') {
read_line(file);
} else {
if (next == '\n' || next == EOF) {
result[position] = '\0';
return result;
} else {
result[position++] = (char)next;
}
}
}
}
/* Exits the game if the provided files are empty.
*
* @param (FILE* rules) (filename of the rules file)
* @param (FILE* plrmap) (filename of the player map file)
* @param (FILE* cpumap) (filename of the cpu map file)
* @param (FILE* turns) (filename of the turns file)
*/
void check_null_files(FILE* rules, FILE* plrmap, FILE* cpumap, FILE* turns)
{
if (rules == NULL) {
error_exit(E_RULES_MISSING);
}
if (plrmap == NULL) {
error_exit(E_PLAYER_MAP_MISSING);
}
if (cpumap == NULL) {
error_exit(E_CPU_MAP_MISSING);
}
if (turns == NULL) {
error_exit(E_CPU_TURNS_MISSING);
}
}
/* Closes files at the end of the game.
*
* @param all the same as check_null_files function
*/
void close_files(FILE* rules, FILE* plrmap, FILE* cpumap, FILE* turns)
{
fclose(rules);
fclose(plrmap);
fclose(cpumap);
fclose(turns);
}
/* Removes leading and trailing whitespace from provided string.
*
* @param (char* string) (string to have whitespace removed from)
*
* @return (char* string) (string with whitespace removed)
*/
char* trim_whitespace(char* string)
{
char* end;
while (isspace((unsigned char)*string)) {
string++;
}
end = string + strlen(string) - 1;
while (end > string && isspace((unsigned char)*end)) {
end--;
}
end[1] = '\0';
return string;
}
/* Returns a character based on the value. * for a hit, / for a miss and .
* otherwise.
*
* @param (int value) (status of position on the board)
*
* @return (char c) (character to be placed in that position of the board)
*/
char cpu_chars(int value)
{
char c;
switch (value) {
case HIT:
c = '*';
break;
case MISS:
c = '/';
break;
case NONE:
c = '.';
break;
default:
c = '.';
break;
}
return c;
}
/* Returns a character based on the value. * for a hit, the ship number for
* a ship and . otherwise.
*
* @param (int value) (status of position on the board)
*
* @return (char c) (character to be placed in that position of the board)
*/
char player_chars(int value)
{
char c;
switch (value) {
case HIT:
c = '*';
break;
case MISS:
//remain as is
case NONE:
c = '.';
break;
default:
if (value > 9) {
c = value + 55;
} else {
c = value + '0';
}
break;
}
return c;
}
/* Checks if the input string is a valid move and returns 0 if so.
*
* @param (char* move) (the ove just played as a string)
*
* @return (int) (0 if a bad move, 1 if not)
*/
int check_bad_move(char* move)
{
if (strlen(move) == 3) {
if (!(isupper(move[0])) || !(isdigit(move[1])) ||
!(isdigit(move[2]))) {
return 0;
}
} else if (strlen(move) == 2) {
if (!(isupper(move[0])) || !(isdigit(move[1]))) {
return 0;
}
} else {
return 0;
}
return 1;
}
/* Checks if the x and y coordinates are valid and returns 0 if so.
*
* @param (int x) (x coordinate of the boards position)
* @param (int y) (y coordinate of the boards position)
* @param (int width) (width of the board)
* @param (int height) (height of the board)
*
* @return (int) (0 if a bad guess, 1 if not)
*/
int check_bad_guess(int x, int y, int width, int height)
{
if ((x > width) || (x < 1) || (y < 1) || (y > height)) {
return 0;
}
return 1;
}
/* Checks if the move just played has been played before.
*
* @param (int player) (PLAYER or CPU depending on which map file)
* @param (int x) (x coordinate of the boards position)
* @param (int y) (y coordinate of the boards position)
*
* @return (int) (0 if repeated guess, 1 if not)
*/
int check_repeat(int player, int x, int y)
{
if (player == CPU) {
if (playerBoard[y][x] == HIT || playerBoard[y][x] == MISS) {
return 0;
}
} else if (player == PLAYER) {
if (cpuBoard[y][x] == HIT || cpuBoard[y][x] == MISS) {
return 0;
}
}
return 1;
}
/* Checks if the hit just played sunk a ship and prints sunk ship if so..
*
* @param (int player) (PLAYER or CPU depending on which map file)
* @param (int ship) (ship number that was hit)
* @param (int width) (width of the board)
* @param (int height) (height of the board)
*/
void check_sunk(int player, int ship, int width, int height)
{
if (player == PLAYER) {
for (int i = 1; i < (height + 1); i++) {
for (int j = 1; j < (width + 1); j++) {
if (cpuBoard[i][j] == ship) {
// another position exists with that ship in it
return;
}
}
}
// no other positions exists with that ship on it
printf("Ship sunk\n");
} else if (player == CPU) {
for (int i = 1; i < (height + 1); i++) {
for (int j = 1; j < (width + 1); j++) {
if (playerBoard[i][j] == ship) {
return;
}
}
}
printf("Ship sunk\n");
}
}
/* Checks if the move just played was a hit or miss and updates the board
* character accordingly.
*
* @param (int player) (PLAYER or CPU depending on which map file)
* @param (int x) (x coordinate of the boards position)
* @param (int y) (y coordinate of the boards position)
* @param (int width) (width of the board)
* @param (int height) (height of the board)
*
* @return (int) (0 if miss, 1 if hit)
*/
int check_hit(int player, int x, int y, int width, int height)
{
if (player == CPU) {
if (!(playerBoard[y][x] == HIT || playerBoard[y][x] == MISS ||
playerBoard[y][x] == NONE)) {
// position is a ship
printf("Hit\n");
playerBoard[y][x] = HIT;
player_chars(playerBoard[y][x]);
return 1;
} else {
//position is not a ship
printf("Miss\n");
playerBoard[y][x] = MISS;
player_chars(playerBoard[y][x]);
}
} else if (player == PLAYER) {
if (!(cpuBoard[y][x] == HIT || cpuBoard[y][x] == MISS ||
cpuBoard[y][x] == NONE)) {
printf("Hit\n");
cpuBoard[y][x] = HIT;
cpu_chars(cpuBoard[y][x]);
return 1;
} else {
printf("Miss\n");
cpuBoard[y][x] = MISS;
cpu_chars(cpuBoard[y][x]);
}
}
return 0;
}
/* Reads the players move from stdin and if it is not a bad guess
* will then check for hit or miss and check for sunk ship.
*
* @param (int width) (width of the board)
* @param (int height) (height of the board)
*/
void get_player_move(int width, int height)
{
char c;
int y;
char* move;
printf("(Your move)>");
move = read_line(stdin);
if (strlen(move) == 0) {
error_exit(E_PLAYER_GIVES_UP);
}
if (!(check_bad_move(trim_whitespace(move)))) {
printf("Bad guess\n");
get_player_move(width, height);
} else {
// is a valid input
sscanf(trim_whitespace(move), "%c%i", &c, &y);
int x = c - 64;
if (!(check_bad_guess(x, y, width, height))) {
printf("Bad guess\n");
get_player_move(width, height);
} else if (!check_repeat(PLAYER, x, y)) {
printf("Repeated guess\n");
get_player_move(width, height);
} else {
// not a bad or repeated guess
int ship = cpuBoard[y][x];
check_hit(PLAYER, x, y, width, height);
check_sunk(PLAYER, ship, width, height);
}
}
}
/* Reads the cpus move from the turns file and if it is not a bad guess
* will then check for hit or miss and check for sunk ship.
*
* @param (FILE* turns) (filename of the cpu turns file)
* @param (int width) (width of the board)
* @param (int height) (height of the board)
*/
void get_cpu_move(FILE* turns, int width, int height)
{
char c;
int y;
char* move;
printf("(CPU move)>");
move = read_line(turns);
if (strlen(move) == 0) {
error_exit(E_CPU_GIVES_UP);
}
printf("%s\n", move);
if (!(check_bad_move(trim_whitespace(move)))) {
printf("Bad guess\n");
get_cpu_move(turns, width, height);
} else {
// is a valid input
sscanf(trim_whitespace(move), "%c%i", &c, &y);
int x = c - 64;
if (!(check_bad_guess(x, y, width, height))) {
printf("Bad guess\n");
get_cpu_move(turns, width, height);
} else if (!check_repeat(CPU, x, y)) {
printf("Repeated guess\n");
get_cpu_move(turns, width, height);
} else {
// not a bad or repeated guess
int ship = playerBoard[y][x];
check_hit(CPU, x, y, width, height);
check_sunk(CPU, ship, width, height);
}
}
}
/* Checks if any of the ships overlap another by checking each position on
* the boards status.
*
* @param (int player) (PLAYER or CPU depending on which map file)
* @param (int shipNum) (ship number)
* @param (int x) (x coordinate of the boards position)
* @param (int y) (y coordinate of the boards position)
*/
void check_overlap(int player, int shipNum, int x, int y){
if (player == PLAYER) {
if (playerBoard[y][x] == HIT || playerBoard[y][x] == MISS ||
playerBoard[y][x] == NONE) {
return;
}
error_exit(E_PLAYER_SHIP_OVERLAP);
} else if (player == CPU) {
if (cpuBoard[y][x] == HIT || cpuBoard[y][x] == MISS ||
cpuBoard[y][x] == NONE) {
return;
}
error_exit(E_CPU_SHIP_OVERLAP);
}
}
/* Loops through each ship placing its corresponding number on the board.
*
* @param (int player) (PLAYER or CPU depending on which map file)
* @param (int sizes[]) (array of ship sizes)
* @param (int shipNum) (ship number)
* @param (int x) (x coordinate of the boards position)
* @param (int y) (y coordinate of the boards position)
* @param (char dir) (direction ship is to be placed in)
* @param (int width) (width of the board)
* @param (int height) (height of the board)
*/
void ship_directions(int player, int sizes[], int shipNum, int x, int y,
char dir, int width, int height)
{
for (int i = 0; i < sizes[shipNum - 1]; i++) {
check_overlap(player, shipNum, x, y);
(player == PLAYER) ? player_chars(playerBoard[y][x] = shipNum)
: cpu_chars(cpuBoard[y][x] = shipNum);
switch (dir) {
case 'N':
y--;
break;
case 'E':
x++;
break;
case 'S':
y++;
break;
case 'W':
x--;
break;
default:
(player == PLAYER) ? error_exit(E_PLAYER_MAP) :
error_exit(E_CPU_MAP);
break;
}
if (x < 0 || x > width + 1 || y < 0 || y > height + 1) {
(player == PLAYER) ? error_exit(E_PLAYER_MAP_OOB) :
error_exit(E_CPU_MAP_OOB);
}
}
}
/* Reads the map files line by line to get the ship location and direction,
* checks if the position is bad and checks if the number of ships aligns wi
* th that in the rules file.
*
* @param (FILE* file) (filename of the map file)
* @param (int player) (PLAYER or CPU depending on which map file)
* @param (int sizes[]) (array of ship sizes)
* @param (int num) (number of ships each player has)
* @param (int width) (width of the board)
* @param (int height) (height of the board)
*/
void read_map(FILE* file, int player, int sizes[], int num, int width,
int height)
{
char* line;
char c, dir;
int x, y, shipNum = 0;
char* buffer[10];
while (line = trim_whitespace(read_line(file)), strlen(line) != 0) {
int i = 0;
char* token = strtok(line, " ");
while (token != NULL) {
buffer[i++] = token;
token = strtok(NULL, " ");
}
if (i > 2) {
(player == PLAYER) ? error_exit(E_PLAYER_MAP) :
error_exit(E_CPU_MAP);
} else {
char* move = trim_whitespace(buffer[0]);
char* direction = trim_whitespace(buffer[1]);
if (!(check_bad_move(move))) {
(player = PLAYER) ? error_exit(E_PLAYER_MAP) :
error_exit(E_CPU_MAP);
} else {
// is a valid move
sscanf(move, "%c%i", &c, &y);
x = c - 64;
if (check_bad_guess(x, y, width, height)) {
// isnt out of bounds
if (strlen(trim_whitespace(direction)) == 1) {
// is a valid direction
sscanf(direction, "%c", &dir);
shipNum++;
ship_directions(player, sizes, shipNum, x, y, dir,
width, height);
}
}
}
}
}
if (shipNum != num) {
(player == PLAYER) ? error_exit(E_PLAYER_MAP) :
error_exit(E_CPU_MAP);
}
}
/* Displays the cpu board after each player and cpu move with updated
* statues.
*
* @param (int width) (width of the board)
* @param (int height) (height of the board)
*/
void display_cpu_board(int width, int height)
{
printf(" ");
for (char c = 65; c <= (width + 64); c++) {
printf("%c", c);
}
printf("\n");
for (int i = 1; i < (height + 1); i++) {
if (i < 10) {
printf(" %i ", i);
} else {
printf("%i ", i);
}
for (int j = 1; j < (width + 1); j++) {
printf("%c", cpu_chars(cpuBoard[i][j]));
}
printf("\n");
}
}
/* Displays the player board after each player and cpu move with updated
* statues.
*
* @param (int width) (width of the board)
* @param (int height) (height of the board)
*/
void display_player_board(int width, int height)
{
printf("===\n ");
for (char c = 65; c <= (width + 64); c++) {
printf("%c", c);
}
printf("\n");
for (int i = 1; i < (height + 1); i++) {
if (i < 10) {
printf(" %i ", i);
} else {
printf("%i ", i);
}
for (int j = 1; j < (width + 1); j++) {
printf("%c", player_chars(playerBoard[i][j]));
}
printf("\n");
}
}
/* Checks if cpu has won the game by sinking all the cpu ships.
*
* @param (int width) (width of the board)
* @param (int height) (height of the board)
*
* @return (int) (1 if cpu has won, 0 otherwise)
*/
int check_cpu_win(int width, int height)
{
for (int i = 1; i < (height + 1); i++) {
for (int j = 1; j < (width + 1); j++) {
if (!(playerBoard[i][j] == HIT || playerBoard[i][j] == MISS ||
playerBoard[i][j] == NONE)) {
return 0;
}
}
}
return 1;
}
/* Checks if player has won the game by sinking all the cpu ships.
*
* @param (int width) (width of the board)
* @param (int height) (height of the board)
*
* @return (int) (1 if player has won, 0 otherwise)
*/
int check_player_win(int width, int height)
{
for (int i = 1; i < (height + 1); i++) {
for (int j = 1; j < (width + 1); j++) {
if (!(cpuBoard[i][j] == HIT || cpuBoard[i][j] == MISS ||
cpuBoard[i][j] == NONE)) {
return 0;
}
}
}
return 1;
}
/* Checks if either player has won the game and returns 0 if not.
*
* @param (int width) (width of the board)
* @param (int height) (height of the board)
*
* @return (int) (0 if game is still going, 1 if otherwise)
*/
int check_win(int width, int height)
{
if (check_player_win(width, height)) {
printf("Game over - you win\n");
return 1;
} else if (check_cpu_win(width, height)) {
printf("Game over - you lose\n");
return 1;
}
return 0;
}
/* Takes in filenames and opens them, initialises gameplay and loops until
* the game has been won or an error occurs.
*
* @param (int argc) (number of arguments)
* @param (char* argv[]) (array of argument strings)
*
* @return (int) (0 if game exits normally)
*/
int main(int argc, char* argv[])
{
if (argc < 5) {
error_exit(E_NOT_ENOUGH_PARAMETERS);
}
int boardWidth, boardHeight, numShips;
int shipSizes[numShips];
FILE* rulesFile = fopen(argv[1], "r");
FILE* playerMapFile = fopen(argv[2], "r");
FILE* cpuMapFile = fopen(argv[3], "r");
FILE* turnsFile = fopen(argv[4], "r");
check_null_files(rulesFile, playerMapFile, cpuMapFile, turnsFile);
sscanf(read_line(rulesFile), "%i %i", &boardWidth, &boardHeight);
sscanf(read_line(rulesFile), "%i ", &numShips);
for (int i = 0; i < numShips; i++) {
sscanf(read_line(rulesFile), "%i", &shipSizes[i]);
}
if ((boardWidth < 0) || (boardHeight < 0) || (boardWidth > MAX) ||
(boardHeight > MAX) || (numShips > 15)) {
error_exit(E_RULES);
}
initialise_cpu_board(boardWidth, boardHeight);
initialise_player_board(boardWidth, boardHeight);
read_map(playerMapFile, PLAYER, shipSizes, numShips, boardWidth,
boardHeight);
read_map(cpuMapFile, CPU, shipSizes, numShips, boardWidth,
boardHeight);
while (!check_win(boardWidth, boardHeight)) {
display_cpu_board(boardWidth, boardHeight);
display_player_board(boardWidth, boardHeight);
get_player_move(boardWidth, boardHeight);
if (check_win(boardWidth, boardHeight)) {
break;
}
get_cpu_move(turnsFile, boardWidth, boardHeight);
if (check_win(boardWidth, boardHeight)) {
return 0;
}
}
close_files(rulesFile, playerMapFile, cpuMapFile, turnsFile);
return 0;
}