1 /* 2 * testuhr.c 3 * 4 * Autor: H.Drachenfels 5 * Erstellt am: 25.7.2018 6 */

7

8 #include "testuhr.h"

9 #include "uhr_impl.h"

10 #include <stdlib.h>

11

12 struct testuhr

13 {

14 uhr interface; // muss am Anfang stehen

15 unsigned stunde;

16 unsigned minute;

17 };

18

19 static void destruct(uhr * const u);

20 static void ablesen(const uhr * const u, unsigned *s, unsigned *m);

21

22 uhr *new_testuhr()

23 {

24 struct testuhr *this_p = (struct testuhr*) malloc(sizeof (struct testuhr));

25 if (!this_p) return NULL;

26

27 this_p->interface.destruct = destruct;

28 this_p->interface.ablesen = ablesen;

29

30 this_p->stunde = 0;

31 this_p->minute = 0;

32

33 return &this_p->interface;

34 }

35

36 void testuhr_stellen(uhr * const u, unsigned s, unsigned m)

37 {

38 struct testuhr * const this_p = (struct testuhr *) u; // Downcast

39 this_p->stunde = (s + m / 60) % 24;

40 this_p->minute = m % 60;

41 }

42

43 static void destruct(uhr * const u)

44 {

45 free(u);

46 }

47

48 static void ablesen(const uhr * const u, unsigned *s, unsigned *m)

49 {

50 const struct testuhr * const this_p = (const struct testuhr *) u; // Downcast

51 *s = this_p->stunde;

52 if (m) *m = this_p->minute;

53 }

54