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/* memset_s.c */
void *memset_s(void \*v, int c, size_t n) {
  volatile char *p = v;
  while (n--)
    *p++ = c;

  return v;
}

/* getPassword.c */
extern void *memset_s(void *v, int c, size_t n);

void getPassword() {
  char pwd[64];
  if (retrievePassword(pwd, sizeof(pwd))) {
     /*checking of password, secure operations, etc \*/
  }
  pwd = memset_s(pwd, 0, sizeof(pwd));
}