从文件读取到 C 中的二维数组，没有固定大小

Question

I have a text file that have content like this

5 6
01111
11110
01000
01111
11010
11111

And i want to made a function read from this file and create 2d array out of the content.

Two Numbers from the first line is the size of array and the size of sub array.

The result of the function should be array like this

{{0,1,1,1,1}, {1,1,1,1,0},{0,1,0,0,0},{0,1,1,1,1},{1,1,0,1,0},{1,1,1,1,1}}

So how would i be able to do that?

Right now i try to made a function like this but it error

int** createArray(FILE *fp)
{
    int xdim;
    int ydim;
    fscanf(fp, "%d %d", &xdim, &ydim);

    int** arr = malloc(ydim * sizeof(*arr));;
    for (int y = 0; y < ydim; y++)
    {
        arr[y] = malloc(xdim * sizeof(**arr));
        fscanf(fp, "%d %d %d %d", arr[y]);
    }
    return arr;
}

Answer 1

Just loop xdim times over arr[y] then and read numbers with fscanf . Note that a space " " in fscanf format specifier ignores all whitespaces - tabs, spaces and newlines - so it can just read it all.

int** arr = malloc(ydim * sizeof(*arr));;
if (arr == NULL) {
     abort();
}

for (int y = 0; y < ydim; y++) {

    arr[y] = malloc(xdim * sizeof(*arr[y]));
    if (arr[y] == NULL) {
        abort();
    }

    for (int i = 0; i < xdim; ++i) {
        char c;
        if (fscanf(fp, " %c", &c) != 1) {
            abort(); // handle error
        }
        arr[i][j] = c - '0';
    }
}

Tested on godbolt .