libs/bsd: add explicit_bzero(3)

Signed-off-by: Augustin Cavalier <[email protected]>

headers/compatibility/bsd/string.h

@@ -17,6 +17,7 @@ extern "C" {
 #endif
 
 char* strsep(char** string, const char* delimiters);
+void explicit_bzero(void *buf, size_t len);
 
 #ifdef __cplusplus
 }

src/libs/bsd/Jamfile

@@ -13,6 +13,7 @@ for architectureObject in [ MultiArchSubDirSetup ] {
 		SharedLibrary [ MultiArchDefaultGristFiles libbsd.so ] :
 			daemon.c
 			err.c
+			explicit_bzero.c
 			fgetln.c
 			getpass.c
 			issetugid.c

src/libs/bsd/explicit_bzero.c

@@ -0,0 +1,22 @@
+/*	$OpenBSD: explicit_bzero.c,v 1.3 2014/06/21 02:34:26 matthew Exp $ */
+/*
+ * Public domain.
+ * Written by Matthew Dempsky.
+ */
+
+#include <string.h>
+
+__attribute__((weak)) void
+__explicit_bzero_hook(void *buf, size_t len);
+
+__attribute__((weak)) void
+__explicit_bzero_hook(void *buf, size_t len)
+{
+}
+
+void
+explicit_bzero(void *buf, size_t len)
+{
+	memset(buf, 0, len);
+	__explicit_bzero_hook(buf, len);
+}