/*

 * Copyright 2011 Steven Gribble

 *

 *  This file is the solution to an exercise problem posed during

 *  one of the UW CSE 333 lectures (333exercises).

 *

 *  333exercises is free software: you can redistribute it and/or modify

 *  it under the terms of the GNU General Public License as published by

 *  the Free Software Foundation, either version 3 of the License, or

 *  (at your option) any later version.

 *

 *  333exercises is distributed in the hope that it will be useful,

 *  but WITHOUT ANY WARRANTY; without even the implied warranty of

 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 *  GNU General Public License for more details.

 *

 *  You should have received a copy of the GNU General Public License

 *  along with 333exercises.  If not, see <http://www.gnu.org/licenses/>.

 */



// Lecture 3 exercise 3



#include <stdio.h>   // needed for printf

#include <stdlib.h>  // needed for malloc, free, EXIT_SUCCESS

#include <assert.h>  // needed for assert



// Write a function that:

//

//  - accepts an (array of ints) and an (array length) as arguments

//

//  - malloc’s an (array of (int *)) of the same length

//

//  - initializes each element of the newly allocated array to point to

//    the corresponding element in the passed-in array

//

//  - returns a pointer to the newly allocated array



int **MakePointerArray(int *intarray, int arraylen) {

  int **parray;

  int   i;



  // do some sanity checking on the arguments

  assert(intarray != NULL);

  assert(arraylen > 0);



  // malloc the array, make sure we had the memory for it

  parray = (int **) malloc(arraylen*sizeof(int *));

  assert(parray != NULL);



  // initialize the array

  for (i = 0; i < arraylen; i++) {

    parray[i] = &(intarray[i]);

  }



  // return the array

  return parray;

}



int main(int argc, char **argv) {

  int **parray = NULL;

  int   intarray[2] = {1, 2};



  parray = MakePointerArray(intarray, 2);

  assert(parray != NULL);

  assert(parray[0] == &(intarray[0]));

  assert(parray[1] == &(intarray[1]));

  free(parray);



  return EXIT_SUCCESS;

}