Simple dynamic memory allocation bug.
- by M4design
I'm sure you (pros) can identify the bug's' in my code, I also would appreciate any other comments on my code.
BTW, the code crashes after I run it.
#include <stdlib.h>
#include <stdio.h>
#include <stdbool.h>
typedef struct
{
int x;
int y;
} Location;
typedef struct
{
bool walkable;
unsigned char walked; // number of times walked upon
} Cell;
typedef struct
{
char name[40]; // Name of maze
Cell **grid; // 2D array of cells
int rows; // Number of rows
int cols; // Number of columns
Location entrance;
} Maze;
Maze *maz_new()
{
int i = 0;
Maze *mazPtr = (Maze *)malloc(sizeof (Maze));
if(!mazPtr)
{
puts("The memory couldn't be initilised, Press ENTER to exit");
getchar();
exit(-1);
}
else
{
// allocating memory for the grid
mazPtr->grid = (Cell **) malloc((sizeof (Cell)) * (mazPtr->rows));
for(i = 0; i < mazPtr->rows; i++)
mazPtr->grid[i] = (Cell *) malloc((sizeof (Cell)) * (mazPtr->cols));
}
return mazPtr;
}
void maz_delete(Maze *maz)
{
int i = 0;
if (maz != NULL)
{
for(i = 0; i < maz->rows; i++)
free(maz->grid[i]);
free(maz->grid);
}
}
int main()
{
Maze *ptr = maz_new();
maz_delete(ptr);
getchar();
return 0;
}
Thanks in advance.
