double **mat = malloc(sizeof(double *) * row_cnt);
    for (int i=0 ; i < row_cnt ; i++) {
        mat[i] = malloc(sizeof(double) * col_cnt);
    }

    for (int i=0 ; i < row_cnt ; i++) {
        for (int j=0 ; j < col_cnt ; j++) {
            if (!fscanf(inp_mat_file, "%lf", &mat[i][j])) {
                break;
            }
        }
    }