Move the registration of callback functions to special functions

designed for that.  This removes the potential error to mix data and
function pointers.

Please note that I'm a little unsure how incorrect calls to the old
ctrl functions should be handled, in som cases.  I currently return 0
and that's it, but it may be more correct to generate a genuine error
in those cases.

1 files changed, 17 insertions, 0 deletions

diff --git a/crypto/evp/bio_md.c b/crypto/evp/bio_md.c
index 317167f9c4..aef928dd8f 100644
--- a/crypto/evp/bio_md.c
+++ b/crypto/evp/bio_md.c
@@ -72,6 +72,8 @@ static int md_gets(BIO *h,char *str,int size);
 static long md_ctrl(BIO *h,int cmd,long arg1,char *arg2);
 static int md_new(BIO *h);
 static int md_free(BIO *data);
+static long md_callback_ctrl(BIO *h,int cmd,void (*fp)());
+
 static BIO_METHOD methods_md=
 	{
 	BIO_TYPE_MD,"message digest",
@@ -82,6 +84,7 @@ static BIO_METHOD methods_md=
 	md_ctrl,
 	md_new,
 	md_free,
+	md_callback_ctrl,
 	};
 
 BIO_METHOD *BIO_f_md(void)
@@ -220,6 +223,20 @@ static long md_ctrl(BIO *b, int cmd, long num, char *ptr)
 	return(ret);
 	}
 
+static long md_callback_ctrl(BIO *b, int cmd, void (*fp)())
+	{
+	long ret=1;
+
+	if (b->next_bio == NULL) return(0);
+	switch (cmd)
+		{
+	default:
+		ret=BIO_callback_ctrl(b->next_bio,cmd,fp);
+		break;
+		}
+	return(ret);
+	}
+
 static int md_gets(BIO *bp, char *buf, int size)
 	{
 	EVP_MD_CTX *ctx;