summaryrefslogtreecommitdiff
path: root/snake.c
diff options
context:
space:
mode:
Diffstat (limited to 'snake.c')
-rw-r--r--snake.c57
1 files changed, 35 insertions, 22 deletions
diff --git a/snake.c b/snake.c
index 33e9487..ba73317 100644
--- a/snake.c
+++ b/snake.c
@@ -33,8 +33,18 @@ void interrupt_handler(int sig) {
}
int main(int argc, char **argv) {
+ int i;
+ struct winsize win;
+ int width;
+ int height;
+ int smallestAxis;
+ volatile int *lastInput;
+ int *cancellationToken;
+ threadArg_t threadArg;
+ pthread_t listenerID;
+
/* parsing arguments */
- for (int i = 1; i < argc; i ++) {
+ for (i = 1; i < argc; i ++) {
if (strcmp("--version", argv[i]) == 0) {
printf("snake3, version 1.0\n");
printf("Copyright 2023 Kai Stevenson\n");
@@ -51,12 +61,11 @@ int main(int argc, char **argv) {
}
/* get terminal size */
- struct winsize win;
ioctl(fileno(stdout), TIOCGWINSZ, &win);
- int width = (int)(win.ws_col);
- int height = (int)(win.ws_row);
+ width = (int)(win.ws_col);
+ height = (int)(win.ws_row);
/* multiplied by 2 to account for the fact that the board is twice as wide as high */
- int smallestAxis = width / 2 < height ? width / 2 : height;
+ smallestAxis = width / 2 < height ? width / 2 : height;
boardSize = smallestAxis < boardSize ? smallestAxis : boardSize;
/* hide cursor */
printf("\033[?25l");
@@ -75,17 +84,20 @@ int main(int argc, char **argv) {
/* clear the screen so as to prevent artifacting */
printf("\033[2J");
/* prepare the pointers which will be used to communicate with the input getting thread */
- volatile int* lastInput = calloc(1, sizeof(int));
- int* cancellationToken = calloc(1, sizeof(int));
+ lastInput = calloc(1, sizeof(int));
+ cancellationToken = calloc(1, sizeof(int));
/* and the wrapper struct */
- threadArg_t threadArg;
threadArg.returnV = (void*)lastInput;
threadArg.cancellationToken = cancellationToken;
/* create listener thread */
- pthread_t listenerID;
pthread_create(&listenerID, NULL, get_dir_loop, &threadArg);
/* main game logic loop */
while(1) {
+ struct timespec time;
+ int ateFood = 0;
+ int died = 0;
+ vector_t dir;
+ vectorp_t newSnakePositions;
/* handle ctrl-c interrupt */
if (INT_CTRL_C) {
/* unhide cursor */
@@ -103,12 +115,11 @@ int main(int argc, char **argv) {
draw_board();
/* handle player input;
* wait for the specified interval */
- struct timespec time;
time.tv_sec = 0;
time.tv_nsec = updateInterval;
nanosleep(&time, NULL);
/* read the most recent value emitted by the listener */
- vector_t dir = parse_dir(*(char*)lastInput);
+ dir = parse_dir(*(char*)lastInput);
/* if the player inputted a valid direction, use it. otherwise, use his last valid input */
if((dir.mx != 0 || dir.my != 0) && !(dir.mx == 1 && lastMoveDir.mx == -1) && !(dir.mx == -1 && lastMoveDir.mx == 1) && !(dir.my == 1 && lastMoveDir.my == -1) && !(dir.my == -1 && lastMoveDir.my == 1)) {
lastMoveDir = dir;
@@ -116,7 +127,6 @@ int main(int argc, char **argv) {
else {
}
/* check if snake landed on the food */
- int ateFood = 0;
if((snakePositions.vectors[0].mx + lastMoveDir.mx == foodPos.mx) && (snakePositions.vectors[0].my + lastMoveDir.my == foodPos.my)) {
ateFood = 1;
SCORE = SCORE + 1;
@@ -125,10 +135,10 @@ int main(int argc, char **argv) {
}
/* move the food */
while(1) {
+ int overlap = 0;
foodPos = init_vector(1 + (rand() % (boardSize - 2)), 1 + (rand() % (boardSize - 2)));
/* if food overlaps snake, try again */
- int overlap = 0;
- for(int i = 0; i < snakePositions.length; i++) {
+ for(i = 0; i < snakePositions.length; i++) {
if((snakePositions.vectors[i].mx == foodPos.mx) && (snakePositions.vectors[i].my == foodPos.my)) {
overlap = 1;
}
@@ -139,12 +149,11 @@ int main(int argc, char **argv) {
}
}
/* move the snake */
- vectorp_t newSnakePositions = move_snake(lastMoveDir, ateFood);
+ newSnakePositions = move_snake(lastMoveDir, ateFood);
free(snakePositions.vectors);
snakePositions = newSnakePositions;
/* check if snake landed on self */
- int died = 0;
- for(int i = 1; i < snakePositions.length; i++) {
+ for(i = 1; i < snakePositions.length; i++) {
if(snakePositions.vectors[0].mx == snakePositions.vectors[i].mx && snakePositions.vectors[0].my == snakePositions.vectors[i].my) {
/* game over */
died = 1;
@@ -188,28 +197,32 @@ vector_t parse_dir(char cDir) {
}
}
vectorp_t move_snake(vector_t dir, int lengthen) {
+ int i;
int newLength = snakePositions.length + (lengthen ? 1 : 0);
vector_t* newSnakePositions = malloc((newLength * sizeof(vector_t)));
/* wrap around edges */
int nhx = snakePositions.vectors[0].mx + dir.mx;
- nhx = nhx < 0 ? boardSize - 1 : nhx >= boardSize ? 0 : nhx;
int nhy = snakePositions.vectors[0].my + dir.my;
+ nhx = nhx < 0 ? boardSize - 1 : nhx >= boardSize ? 0 : nhx;
nhy = nhy < 0 ? boardSize - 1 : nhy >= boardSize ? 0 : nhy;
newSnakePositions[0] = init_vector(nhx, nhy);
- for(int i = 1; i < newLength; i++) {
+ for(i = 1; i < newLength; i++) {
newSnakePositions[i] = snakePositions.vectors[i - 1];
}
return init_vectorp(newSnakePositions, newLength);
}
void draw_board() {
+ int r;
+ int c;
+ int i;
/* move the cursor to the top left corner of the screen */
printf("\033[0;0H");
/* iterate through and write the board */
- for(int r = 0; r < boardSize; r++) {
- for(int c = 0; c < boardSize; c++) {
+ for(r = 0; r < boardSize; r++) {
+ for(c = 0; c < boardSize; c++) {
/* determine the contents of the board position */
int type = 0;
- for(int i = 0; i < snakePositions.length; i++) {
+ for(i = 0; i < snakePositions.length; i++) {
if(snakePositions.vectors[i].mx == c && snakePositions.vectors[i].my == r) {
type = i ? 2 : 1;
break;
generated by cgit v1.3.1 (git 2.54.0) at 2026-10-22 02:08:14 +0000