TP_13/exo2/lib/coordinates.c

   1 /*
   2  * =====================================================================================
   3  *
   4  *       Filename:  coordinates.c
   5  *
   6  *    Description:  Data definition and functions to manipulate elements in the grid
   7  *
   8  *        Version:  1.0
   9  *        Created:  16/03/2017 19:05:02
  10  *       Revision:  none
  11  *       Compiler:  gcc
  12  *
  13  *         Author:  Jerome Benoit (fraggle), jerome.benoit@piment-noir.org
  14  *   Organization:  Piment Noir
  15  *
  16  * =====================================================================================
  17  */
  18
  19 #include "coordinates.h"
  20
  21 void init_coordinates(coordinates_t* coordinates_array) {
  22     for (unsigned i = 0; i < MAX_COORDINATES; i++) {
  23         coordinates_array[i] = set_coordinates(0, 0, 0);
  24     }
  25 }
  26
  27 coordinates_t set_coordinates(int y, int x, unsigned type) {
  28     coordinates_t new_coordinates;
  29
  30     new_coordinates.y = y;
  31     new_coordinates.x = x;
  32     new_coordinates.type = type;
  33     return new_coordinates;
  34 }
  35
  36 unsigned add_coordinates(coordinates_t new_coordinates, coordinates_t* coordinates_array) {
  37     /* valid coordinates are in the [1-3] range */
  38     if (new_coordinates.y < 1 || new_coordinates.y > 3 || new_coordinates.x < 1 || new_coordinates.x > 3) {
  39         return 3; /* error value for invalid coordinates */
  40     }
  41     for (unsigned i = 0; i < MAX_COORDINATES; i++) {
  42         /* check if already entered */
  43         if (new_coordinates.y == (coordinates_array + i)->y && new_coordinates.x == (coordinates_array + i)->x) {
  44             return 2; /* error value for duplicates */
  45         } else if ((coordinates_array + i)->y == 0 && (coordinates_array + i)->x == 0) {
  46             coordinates_array[i] = new_coordinates;
  47             return 0; /* error value when everything if fine */
  48         }
  49     }
  50     return 1; /* error value for full array */
  51 }