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 "includes.h" 9 #include <string.h> 10 11 /* 12 * explicit_bzero - don't let the compiler optimize away bzero 13 */ 14 15 #ifndef HAVE_EXPLICIT_BZERO 16 17 #ifdef HAVE_MEMSET_S 18 19 void 20 explicit_bzero(void *p, size_t n) 21 { 22 (void)memset_s(p, n, 0, n); 23 } 24 25 #else /* HAVE_MEMSET_S */ 26 27 /* 28 * Indirect bzero through a volatile pointer to hopefully avoid 29 * dead-store optimisation eliminating the call. 30 */ 31 static void* (* volatile ssh_memset)(void *, int, size_t) = memset; 32 33 void 34 explicit_bzero(void *p, size_t n) 35 { 36 ssh_memset(p, 0, n); 37 } 38 39 #endif /* HAVE_MEMSET_S */ 40 41 #endif /* HAVE_EXPLICIT_BZERO */ 42
