From a142ebcf43b7032ad29a383cba9407e7540b2d4a Mon Sep 17 00:00:00 2001
From: "C. McEnroe" <june@causal.agency>
Date: Thu, 30 Jul 2020 13:36:17 -0400
Subject: [PATCH] Define explicit_bzero using memset_s on macOS

---
 chat.h    | 3 ---
 configure | 6 ++++++
 2 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/chat.h b/chat.h
index 1dfe119..fd8f81a 100644
--- a/chat.h
+++ b/chat.h
@@ -295,6 +295,3 @@ int getopt_config(
 	int argc, char *const *argv,
 	const char *optstring, const struct option *longopts, int *longindex
 );
-
-// Defined in libcrypto if missing from libc:
-void explicit_bzero(void *b, size_t len);
diff --git a/configure b/configure
index b11679d..8282dc7 100755
--- a/configure
+++ b/configure
@@ -45,6 +45,12 @@ case "$(uname)" in
 		config libcrypto libtls ncursesw
 		defvar OPENSSL_BIN openssl exec_prefix /bin/openssl
 		;;
+	(Darwin)
+		cflags -D__STDC_WANT_LIB_EXT1__=1
+		cflags "-D'explicit_bzero(b,l)=memset_s((b),(l),0,(l))'"
+		config libcrypto libtls ncursesw
+		defvar OPENSSL_BIN openssl exec_prefix /bin/openssl
+		;;
 	(*)
 		config libcrypto libtls ncursesw
 		defvar OPENSSL_BIN openssl exec_prefix /bin/openssl