#include <stdio.h>
#include <stdlib.h>

#include "misc.h"

/*****************************************************************************/
/* generate a random num from min to max inclusive on both ends */

int rand_num( int min, int max )
{
     /* prevent /0 errors and strange numbers */
     if( min > max )
     {
          fprintf(stderr, "for rand_num(%d, %d), max must be > min.\n", min, max);
          return max;
     }
     else if( min == max )
          return max;

return rand()%(max-min+1)+min;
}

/*****************************************************************************/

void * create_array( int length, int size )
{
     void *array;

     if( length == 0 || size == 0 )
     {
          fprintf(stderr, "can't create an array of 0 length. [%d](%d)\n", length, size);
          return NULL;
     }

     array = malloc(length*size);
     if( array == NULL )
     {
          fprintf(stderr, "fatal error: can't malloc space for array.\n");
          exit(EXIT_FAILURE);
     }

return array;
}

void delete_array( void *array )
{
     free(array);
return;
}

/*****************************************************************************/

void ** create_grid( int r, int c, int size )
{
     void **grid;
     int i;

     if( r == 0 || c == 0 || size == 0 )
     {
          fprintf(stderr, "can't create grid with 0 dimenson/size [%d][%d](%d).\n", r, c, size);
          return NULL;
     }

     grid = (void **) malloc( r * sizeof(void*) );
     if( grid == NULL )
     {
          fprintf(stderr, "fatal error: can't malloc space for grid rows.\n");
          exit(EXIT_FAILURE);
     }

     for( i = 0; i < r; i++ )
          grid[i] = (void *) create_array(c,size);

return grid;
}

void delete_grid( void **grid, int r )
{
     int i;

     if( r == 0 )
          fprintf(stderr, "can't free grid with 0 rows.\n");

     for( i = 0; i < r; i++ )
          delete_array(grid[i]);

     free(grid);
return;
}