如何使用指向指针的指针指向指向此链接列表的指针的项目

Question

Good Day, I am working on a filler game where: two players gain points by placing on a board, one after the other, the game piece obtained by the game master (in the form of an executable Ruby program). The game ends when the game piece cannot be placed anymore.

Below is the code used to read my player number and starting piece:

***void init_player(t_player *player)***
{
    char    *line;

    get_next_line(0, &line);
    if ((!(ft_strncmp(line, "$$$ exec p", 10))))
    {
        if (line[10] == '1')
        {
            player->id = '1';
            player->my_shape = 'O';
            player->current_shape = 'o';
        }
        else
        {
            player->id = '2';
            player->my_shape = 'X';
            player->current_shape = 'x';
        }
        ft_strdel(&line);
        return ;
    }
    return ;
}
int     main(void)
{
    t_player    *me;
    me = (t_player *)malloc(sizeof(*me));

    init_player(me);
    ft_putchar(me->my_shape);
    ft_putchar('\n');
    return (0);
}

Now I need help in reading the map size by creating a pointer to pointer of size n + 1 and n being 15 in this please see map below. Or I can try another approach you guys can advise. Thank you Check Map below

$$$ exec p1 : [players/abanlin.filler]
***Plateau 15 17:***
    01234567890123456
000 .................
001 .................
002 .................
003 .................
004 .................
005 .................
006 .................
007 .................
008 ..O..............
009 .................
010 .................
011 .................
012 ..............X..
013 .................
014 .................
Piece 1 2:
**

Answer 1

Guess you want to access items in a 2D array.

In C, there is nothing different between 2D and 1D arrays, they are both memory sequence, just with few difference in the way you look at them.

eg

#include <stdlib.h>
#include <assert.h>

typedef struct {
  // Here mem can be used like a width * height 2D array
  // You can change 'char' here to whatever type you want
  char *mem;
  size_t width;
  size_t height;
} MyMap;

MyMap *create_map(size_t width, size_t height) {
  assert(width > 0 && height > 0);
  // As the size of 'char' is 1 byte, mem should take
  // (width * height * 1) bytes from memory. If you changed
  // type of mem, the size should be 'width * height * sizeof(NewType)'
  MyMap *self = (MyMap *)malloc(sizeof(MyMap) + width * height);
  assert(self);
  self->mem = (char *)(self + 1);
  self->width = width;
  self->height = height;
  return self;
}

void delete_map(MyMap **self){
  if (self && *self) {
    free(*self);
    *self = NULL;
  }
}

/**
 * @param x must be between 0 and width
 * @param y must be between 0 and height
 */
void set_map(MyMap *self, size_t x, size_t y, char value) {
  assert(self);
  assert(x < self->width && y < self->height);
  size_t index = self->width * y + x;
  self->mem[index] = value;
}

int main () {
  const size_t height = 15;
  const size_t width = height + 1;
  MyMap *map = create_map(width, height);
  set_map(map, 0, 0, 'X');
  delete_map(&map);
  return 0;
}

Answer 2

You can read map like below,

#include <stdio.h>
#include <stdlib.h>
#define ROW 5
#define COL 5

int main() {
    int i,j;
    char **board;
    if((board = (char **)calloc(sizeof(char *) , ROW)) == NULL){
        printf("calloc failed at memory allocation for dptr\n");
    }
    printf("Enter board of size %d x %d", ROW, COL);
    for(i = 0; i < ROW; i++){
        if((board[i] = (char *)calloc(sizeof(char) , COL)) == NULL){
            printf("calloc failed at memory allocation for ptr %d\n", i);
        }
        for(j = 0; j < COL; j++){
            if(scanf("%c",&board[i][j]) < 1){
                printf("scanf failed!");
            }
        }
    }
//printing board
    for(i = 0; i < ROW; i++){
        for(j = 0; j < COL; j++){
            printf("%c ",board[i][j]);
        }
        printf("\n");
    }
    for(i = 0; i < ROW; i++){
        free(board[i]);
    }
    free(board);
    return 0;
}

Note: You can take the size of the board form user too, instead defining ROW and COL.