text: /* OPENBSD ORIGINAL: lib/libc/string/explicit_bzero.c */
  /*
   * Public domain.
   * Written by Ted Unangst
   */
  
  #include <string.h>
  
  /*
   * explicit_bzero - don't let the compiler optimize away bzero
   */
  
  #if HAVE_MEMSET_S
  
  void
  explicit_bzero(void *p, size_t n)
  {
  	if (n == 0)
  		return;
  	(void)memset_s(p, n, 0, n);
  }
  
  #else /* HAVE_MEMSET_S */
  
  #include <strings.h>
  
  /*
   * Indirect memset through a volatile pointer to hopefully avoid
   * dead-store optimisation eliminating the call.
   */
  static void (* volatile ssh_memset)(void *, int, size_t) = memset;
  
  void
  explicit_bzero(void *p, size_t n)
  {
  	if (n == 0)
  		return;
  	/*
  	 * clang -fsanitize=memory needs to intercept memset-like functions
  	 * to correctly detect memory initialisation. Make sure one is called
  	 * directly since our indirection trick above sucessfully confuses it.
  	 */
  #if defined(__has_feature)
  # if __has_feature(memory_sanitizer)
  	memset(p, 0, n);
  # endif
  #endif
  
  	ssh_memset(p, 0, n);
  }
  
  #endif /* HAVE_MEMSET_S */
  