scanf, comment ne pas ignorer les espaces ?

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

#define LENGTH 65
#define str(x) # x
#define xstr(x) str(x)

int main(void)
{
  int rc;
  char buff[LENGTH + 1] = "";

  printf("Enter a string with spaces: ");
  fflush(stdout);
  rc = scanf("%" xstr(LENGTH) "[^\n]%*[^\n]", buff);
  if (!feof(stdin))
    getchar();

  while (rc)
  {
    printf("Your string is: \n%s\n", buff);
    printf("Hit Enter key to end, or enter "
	   "a string with spaces: ");
    fflush(stdout);
    rc = scanf("%" xstr(LENGTH) "[^\n]%*[^\n]", buff);
    if (!feof(stdin))
    {
      getchar();
    }
  }
  return 0;
}

#include <stdio.h>

int main(void)
{
  char buff[256] = {0};

  /* Exemple 1: moins complets, mais solide */
  printf("Enter a string with spaces: ");
  scanf("%255[^\n]%*[^\n]", buff);
  printf("String = %s\n", buff);

  /* Exemple 2: version la plus basique, ne gère aucun type d'erreur */
  printf("Enter a string with spaces: ");
  scanf("%[^\n]", buff);
  printf("String = %s\n", buff);

  return 0;
}