explicit_bzero.c: fix comments

* missing/explicit_bzero.c: fix comments.  Microsoft Visual Studio
  does not provide memset_s() in 12.0 at least.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@52845 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 8 insertions, 7 deletions

diff --git a/missing/explicit_bzero.c b/missing/explicit_bzero.c
index bf493c18ac..db66eeeb9d 100644
--- a/missing/explicit_bzero.c
+++ b/missing/explicit_bzero.c
@@ -5,17 +5,18 @@
 #include <windows.h>
 #endif
 
-/* Similar to bzero(), but have a guarantee not to be eliminated from compiler
+/* Similar to bzero(), but has a guarantee not to be eliminated from compiler
    optimization. */
 
 /* OS support note:
- * BSD have explicit_bzero().
- * Windows, OS-X have memset_s().
+ * BSDs have explicit_bzero().
+ * OS-X has memset_s().
+ * Windows has SecureZeroMemory() since XP.
  * Linux has none. *Sigh*
  */
 
 /*
- * Following URL explain why memset_s is added to the standard.
+ * Following URL explains why memset_s is added to the standard.
  * http://www.open-std.org/jtc1/sc22/wg14/www/docs/n1381.pdf
  */
 
@@ -40,7 +41,7 @@ explicit_bzero(void *b, size_t len)
 
  #elif defined HAVE_FUNC_WEAK
 
-/* A weak function never be optimization away. Even if nobody use it. */
+/* A weak function never be optimized away. Even if nobody uses it. */
 WEAK(void ruby_explicit_bzero_hook_unused(void *buf, size_t len));
 void
 ruby_explicit_bzero_hook_unused(void *buf, size_t len)
@@ -64,8 +65,8 @@ explicit_bzero(void *b, size_t len)
 {
     /*
      * volatile is not enough if compiler have a LTO (link time
-     * optimization). At least, the standard provide no guarantee.
-     * However, gcc and major other compiler never optimization a volatile
+     * optimization). At least, the standard provides no guarantee.
+     * However, gcc and major other compiler never optimize a volatile
      * variable away. So, using volatile is practically ok.
      */
     volatile char* p = (volatile char*)b;