1 /* OPENBSD ORIGINAL: lib/libc/string/explicit_bzero.c */
2 /* $OpenBSD: explicit_bzero.c,v 1.1 2014/01/22 21:06:45 tedu Exp $ */
3 /*
4 * Public domain.
5 * Written by Ted Unangst
6 */
7
8 #include "atheme.h"
9
10 /*
11 * explicit_bzero - don't let the compiler optimize away bzero
12 */
13
14 #ifndef HAVE_EXPLICIT_BZERO
15
16 #ifdef HAVE_MEMSET_S
17
18 void
explicit_bzero(void * p,size_t n)19 explicit_bzero(void *p, size_t n)
20 {
21 (void)memset_s(p, n, 0, n);
22 }
23
24 #else /* HAVE_MEMSET_S */
25
26 /*
27 * Indirect bzero through a volatile pointer to hopefully avoid
28 * dead-store optimisation eliminating the call.
29 */
30 static void *(* volatile ssh_memset)(void *, int, size_t) = memset;
31
32 void
explicit_bzero(void * p,size_t n)33 explicit_bzero(void *p, size_t n)
34 {
35 ssh_memset(p, 0, n);
36 }
37
38 #endif /* HAVE_MEMSET_S */
39
40 #endif /* HAVE_EXPLICIT_BZERO */
41