client ***temp = realloc(&tableau,NEW_SIZE);

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

#define dbgprintf(Fmt, ...) printf("%s:%d: " Fmt "\n", __FILE__, __LINE__, __VA_ARGS__)
typedef struct client
{
  char ip[32];
  char id[128];
} client;

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

  client **test;
  client **temp;
  int i = 0;

  int orig = 2;
  int new = orig * 2;

  dbgprintf ("malloc orig %d", orig);
  test = (client **) malloc (sizeof (client *) * orig);
  for (i = 0; i < orig; i++)
    {
      test[ i ] = (client *) malloc (sizeof (struct client));
    }
  dbgprintf ("Reallocation de %i vers %i :", orig, new);
  int u = 0;
  while (u++ < 5)
    {
      strcpy (test[0]->ip, "TEST");
      dbgprintf ("TEST(0) == %s", test[0]->ip);
      dbgprintf ("realloc test %p u %d orig %d new %i", (void *) test, u, orig, new);
      if ((temp = realloc (test, sizeof (client *) * new)) == NULL)
	{
	  fprintf (stderr, "Erreur avec le realloc : %s\n", strerror (errno));
	  return (-1);
	}
      test = temp;
      dbgprintf ("REALLOC EFFECTUE new %d :: TEST(0) == %s", new,
		 test[0]->ip);
      new = orig * 2;
      dbgprintf("ici new=%d", new);
      for (i = orig; i < new; i++)
	{
	  test[ i ] = (client *) malloc (sizeof (struct client));
	  orig = new;
	}
      strcpy (test[1]->ip, "TEST2");
    }
  dbgprintf ("TEST(1) == %s\n", test[1]->ip);
  dbgprintf ("TEST(0) == %s\n", test[0]->ip);
  i = 0;
  while (*test != NULL)
    {
      dbgprintf ("%i => %s\n", ++i, (*test)->ip);
      test++;
    }
  return (0);
}