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

void desallocation(void* ptr) {
  if (ptr != NULL) {
    printf("Desallocation a l'adresse        : %p\n", ptr);
    free(ptr);
  }
  else {
    printf("Attention, tentative de desallocation de NULL");
  }
}

int main(void) {
  size_t taille1 = 3;
  size_t taille2 = 5;
  size_t taille3 = 2;
  int* ptr = (int*) malloc(taille1 * sizeof(int));
  int* tmp;
  if (ptr == NULL) {
    printf("Allocation avortee\n");
    exit(1);
  }
  printf("Allocation reussie a l'adresse   : %p\n", ptr);
  for (int i = 0; i < taille1; i++) {
    ptr[i] = i;
  }
  tmp = (int*) realloc(ptr, taille2 * sizeof(int));
  if (tmp == NULL) {
    printf("Reallocation avortee\n");
    desallocation(ptr);
    ptr = NULL;
    exit(2);
  }
  ptr = tmp;
  printf("Reallocation reussie a l'adresse : %p\n", ptr);
  tmp = (int*) realloc(ptr, taille3 * sizeof(int));
  if (tmp == NULL) {
    printf("Reallocation avortee\n");
    desallocation(ptr);
    ptr = NULL;
    exit(3);
  }
  ptr = tmp;
  printf("Reallocation reussie a l'adresse : %p\n", ptr);
  desallocation(ptr);
  ptr = NULL;
  return 0;
}