Compaq C 6.2 for VMS will complain when we want to convert

non-function pointers to function pointers and vice versa.
The current solution is to have unions that describe the
conversion we want to do, and gives us the ability to extract
the type of data we want.

The current solution is a quick fix, and can probably be made
in a more general or elegant way.

crypto/bio/bss_conn.c

@@ -98,6 +98,12 @@ typedef struct bio_connect_st
 	int (*info_callback)();
 	} BIO_CONNECT;
 
+union int_fn_to_char_u
+	{
+	char *char_p;
+	int (*fn_p)();
+	};
+
 static int conn_write(BIO *h,char *buf,int num);
 static int conn_read(BIO *h,char *buf,int size);
 static int conn_puts(BIO *h,char *str);
@@ -564,16 +570,26 @@ static long conn_ctrl(BIO *b, int cmd, long num, char *ptr)
 	case BIO_CTRL_FLUSH:
 		break;
 	case BIO_CTRL_DUP:
+		{
+		union int_fn_to_char_u tmp_cb;
+		
 		dbio=(BIO *)ptr;
 		if (data->param_port)
 			BIO_set_conn_port(dbio,data->param_port);
 		if (data->param_hostname)
 			BIO_set_conn_hostname(dbio,data->param_hostname);
 		BIO_set_nbio(dbio,data->nbio);
-		(void)BIO_set_info_callback(dbio,data->info_callback);
+		tmp_cb.fn_p=data->info_callback;
+		(void)BIO_set_info_callback(dbio,tmp_cb.char_p);
+		}
 		break;
 	case BIO_CTRL_SET_CALLBACK:
-		data->info_callback=(int (*)())ptr;
+		{
+		union int_fn_to_char_u tmp_cb;
+		
+		tmp_cb.char_p=ptr;
+		data->info_callback=tmp_cb.fn_p;
+		}
 		break;
 	case BIO_CTRL_GET_CALLBACK:
 		{

crypto/mem_dbg.c

@@ -661,21 +661,31 @@ void CRYPTO_mem_leaks(BIO *b)
 #endif
 	}
 
+union void_fn_to_char_u
+	{
+	char *char_p;
+	void (*fn_p)();
+	};
+
 static void (*mem_cb)()=NULL;
 
 static void cb_leak(MEM *m, char *cb)
 	{
-	void (*mem_callback)()=(void (*)())cb;
-	mem_callback(m->order,m->file,m->line,m->num,m->addr);
+	union void_fn_to_char_u mem_callback;
+
+	mem_callback.char_p=cb;
+	mem_callback.fn_p(m->order,m->file,m->line,m->num,m->addr);
 	}
 
 void CRYPTO_mem_leaks_cb(void (*cb)())
 	{
+	union void_fn_to_char_u mem_cb;
+
 	if (mh == NULL) return;
 	CRYPTO_w_lock(CRYPTO_LOCK_MALLOC2);
-	mem_cb=cb;
-	lh_doall_arg(mh,(void (*)())cb_leak,(char *)mem_cb);
-	mem_cb=NULL;
+	mem_cb.fn_p=cb;
+	lh_doall_arg(mh,(void (*)())cb_leak,mem_cb.char_p);
+	mem_cb.char_p=NULL;
 	CRYPTO_w_unlock(CRYPTO_LOCK_MALLOC2);
 	}
 

crypto/objects/o_names.c

@@ -5,6 +5,36 @@
 #include <openssl/lhash.h>
 #include <openssl/objects.h>
 
+union cmp_fn_to_char_u
+	{
+	char *char_p;
+	int (*fn_p)(const char *, const char *);
+	};
+
+union hash_fn_to_char_u
+	{
+	char *char_p;
+	unsigned long (*fn_p)(const char *);
+	};
+
+union int_fn_to_char_u
+	{
+	char *char_p;
+	int (*fn_p)();
+	};
+
+union ulong_fn_to_char_u
+	{
+	char *char_p;
+	unsigned long (*fn_p)();
+	};
+
+union void_fn_to_char_u
+	{
+	char *char_p;
+	void (*fn_p)();
+	};
+
 /* I use the ex_data stuff to manage the identifiers for the obj_name_types
  * that applications may define.  I only really use the free function field.
  */
@@ -31,6 +61,17 @@ int OBJ_NAME_new_index(unsigned long (*hash_func)(), int (*cmp_func)(),
 	{
 	int ret;
 	int i;
+	union ulong_fn_to_char_u tmp_hash_func;
+	union int_fn_to_char_u tmp_cmp_func;
+	union void_fn_to_char_u tmp_free_func;
+	union cmp_fn_to_char_u tmp_strcmp;
+	union hash_fn_to_char_u tmp_lh_strhash;
+
+	tmp_hash_func.fn_p = hash_func;
+	tmp_cmp_func.fn_p = cmp_func;
+	tmp_free_func.fn_p = free_func;
+	tmp_strcmp.fn_p = (int (*)(const char *, const char *))strcmp;
+	tmp_lh_strhash.fn_p = lh_strhash;
 
 	if (names_free == NULL)
 		{
@@ -50,32 +91,32 @@ int OBJ_NAME_new_index(unsigned long (*hash_func)(), int (*cmp_func)(),
 	for (i=sk_num(names_free); i<names_type_num; i++)
 		{
 		MemCheck_off();
-		sk_push(names_hash,(char *)strcmp);
-		sk_push(names_cmp,(char *)lh_strhash);
+		sk_push(names_hash,tmp_strcmp.char_p);
+		sk_push(names_cmp,tmp_lh_strhash.char_p);
 		sk_push(names_free,NULL);
 		MemCheck_on();
 		}
 	if (hash_func != NULL)
-		sk_set(names_hash,ret,(char *)hash_func);
+		sk_set(names_hash,ret,tmp_hash_func.char_p);
 	if (cmp_func != NULL)
-		sk_set(names_cmp,ret,(char *)cmp_func);
+		sk_set(names_cmp,ret,tmp_cmp_func.char_p);
 	if (free_func != NULL)
-		sk_set(names_free,ret,(char *)free_func);
+		sk_set(names_free,ret,tmp_free_func.char_p);
 	return(ret);
 	}
 
 static int obj_name_cmp(OBJ_NAME *a, OBJ_NAME *b)
 	{
 	int ret;
-	int (*cmp)();
+	union int_fn_to_char_u cmp;
 
 	ret=a->type-b->type;
 	if (ret == 0)
 		{
 		if ((names_cmp != NULL) && (sk_num(names_cmp) > a->type))
 			{
-			cmp=(int (*)())sk_value(names_cmp,a->type);
-			ret=cmp(a->name,b->name);
+			cmp.char_p=sk_value(names_cmp,a->type);
+			ret=cmp.fn_p(a->name,b->name);
 			}
 		else
 			ret=strcmp(a->name,b->name);
@@ -86,12 +127,12 @@ static int obj_name_cmp(OBJ_NAME *a, OBJ_NAME *b)
 static unsigned long obj_name_hash(OBJ_NAME *a)
 	{
 	unsigned long ret;
-	unsigned long (*hash)();
+	union ulong_fn_to_char_u hash;
 
 	if ((names_hash != NULL) && (sk_num(names_hash) > a->type))
 		{
-		hash=(unsigned long (*)())sk_value(names_hash,a->type);
-		ret=hash(a->name);
+		hash.char_p=sk_value(names_hash,a->type);
+		ret=hash.fn_p(a->name);
 		}
 	else
 		{
@@ -133,7 +174,7 @@ const char *OBJ_NAME_get(const char *name, int type)
 
 int OBJ_NAME_add(const char *name, int type, const char *data)
 	{
-	void (*f)();
+	union void_fn_to_char_u f;
 	OBJ_NAME *onp,*ret;
 	int alias;
 
@@ -160,8 +201,8 @@ int OBJ_NAME_add(const char *name, int type, const char *data)
 		/* free things */
 		if ((names_free != NULL) && (sk_num(names_free) > ret->type))
 			{
-			f=(void (*)())sk_value(names_free,ret->type);
-			f(ret->name,ret->type,ret->data);
+			f.char_p=sk_value(names_free,ret->type);
+			f.fn_p(ret->name,ret->type,ret->data);
 			}
 		Free((char *)ret);
 		}
@@ -179,7 +220,7 @@ int OBJ_NAME_add(const char *name, int type, const char *data)
 int OBJ_NAME_remove(const char *name, int type)
 	{
 	OBJ_NAME on,*ret;
-	void (*f)();
+	union void_fn_to_char_u f;
 
 	if (names_lh == NULL) return(0);
 
@@ -192,8 +233,8 @@ int OBJ_NAME_remove(const char *name, int type)
 		/* free things */
 		if ((names_free != NULL) && (sk_num(names_free) > type))
 			{
-			f=(void (*)())sk_value(names_free,type);
-			f(ret->name,ret->type,ret->data);
+			f.char_p=sk_value(names_free,type);
+			f.fn_p(ret->name,ret->type,ret->data);
 			}
 		Free((char *)ret);
 		return(1);

ssl/bio_ssl.c

@@ -94,6 +94,12 @@ static BIO_METHOD methods_sslp=
 	ssl_free,
 	};
 
+union void_fn_to_char_u
+	{
+	char *char_p;
+	void (*fn_p)();
+	};
+
 BIO_METHOD *BIO_f_ssl(void)
 	{
 	return(&methods_sslp);
@@ -444,7 +450,12 @@ static long ssl_ctrl(BIO *b, int cmd, long num, char *ptr)
 		ret=BIO_ctrl(ssl->rbio,cmd,num,ptr);
 		break;
 	case BIO_CTRL_SET_CALLBACK:
-		SSL_set_info_callback(ssl,(void (*)())ptr);
+		{
+		union void_fn_to_char_u tmp_cb;
+
+		tmp_cb.char_p = ptr;
+		SSL_set_info_callback(ssl,tmp_cb.fn_p);
+		}
 		break;
 	case BIO_CTRL_GET_CALLBACK:
 		{

ssl/s3_lib.c

@@ -462,6 +462,18 @@ static SSL_METHOD SSLv3_data= {
 	&SSLv3_enc_data,
 	};
 
+union rsa_fn_to_char_u
+	{
+	char *char_p;
+	RSA *(*fn_p)(SSL *, int, int);
+	};
+
+union dh_fn_to_char_u
+	{
+	char *char_p;
+	DH *(*fn_p)(SSL *, int, int);
+	};
+
 static long ssl3_default_timeout(void)
 	{
 	/* 2 hours, the 24 hours mentioned in the SSLv3 spec
@@ -638,7 +650,12 @@ long ssl3_ctrl(SSL *s, int cmd, long larg, char *parg)
 		}
 		break;
 	case SSL_CTRL_SET_TMP_RSA_CB:
-		s->cert->rsa_tmp_cb = (RSA *(*)(SSL *, int, int))parg;
+		{
+		union rsa_fn_to_char_u rsa_tmp_cb;
+
+		rsa_tmp_cb.char_p = parg;
+		s->cert->rsa_tmp_cb = rsa_tmp_cb.fn_p;
+		}
 		break;
 #endif
 #ifndef NO_DH
@@ -665,7 +682,12 @@ long ssl3_ctrl(SSL *s, int cmd, long larg, char *parg)
 		}
 		break;
 	case SSL_CTRL_SET_TMP_DH_CB:
-		s->cert->dh_tmp_cb = (DH *(*)(SSL *, int, int))parg;
+		{
+		union dh_fn_to_char_u dh_tmp_cb;
+
+		dh_tmp_cb.char_p = parg;
+		s->cert->dh_tmp_cb = dh_tmp_cb.fn_p;
+		}
 		break;
 #endif
 	default:
@@ -721,7 +743,12 @@ long ssl3_ctx_ctrl(SSL_CTX *ctx, int cmd, long larg, char *parg)
 		}
 		/* break; */
 	case SSL_CTRL_SET_TMP_RSA_CB:
-		cert->rsa_tmp_cb=(RSA *(*)(SSL *, int, int))parg;
+		{
+		union rsa_fn_to_char_u rsa_tmp_cb;
+
+		rsa_tmp_cb.char_p = parg;
+		cert->rsa_tmp_cb = rsa_tmp_cb.fn_p;
+		}
 		break;
 #endif
 #ifndef NO_DH
@@ -748,7 +775,12 @@ long ssl3_ctx_ctrl(SSL_CTX *ctx, int cmd, long larg, char *parg)
 		}
 		/*break; */
 	case SSL_CTRL_SET_TMP_DH_CB:
-		cert->dh_tmp_cb=(DH *(*)(SSL *, int, int))parg;
+		{
+		union dh_fn_to_char_u dh_tmp_cb;
+
+		dh_tmp_cb.char_p = parg;
+		cert->dh_tmp_cb = dh_tmp_cb.fn_p;
+		}
 		break;
 #endif
 	/* A Thawte special :-) */

ssl/ssl_lib.c

@@ -81,6 +81,18 @@ OPENSSL_GLOBAL SSL3_ENC_METHOD ssl3_undef_enc_method={
 	(int (*)(SSL *, EVP_MD_CTX *, EVP_MD_CTX *, const char*, int, unsigned char *))ssl_undefined_function
 	};
 
+union rsa_fn_to_char_u
+	{
+	char *char_p;
+	RSA *(*fn_p)(SSL *, int, int);
+	};
+
+union dh_fn_to_char_u
+	{
+	char *char_p;
+	DH *(*fn_p)(SSL *, int, int);
+	};
+
 int SSL_clear(SSL *s)
 	{
 	int state;
@@ -1975,13 +1987,23 @@ int SSL_want(SSL *s)
 void SSL_CTX_set_tmp_rsa_callback(SSL_CTX *ctx,RSA *(*cb)(SSL *ssl,
 							  int is_export,
 							  int keylength))
-    { SSL_CTX_ctrl(ctx,SSL_CTRL_SET_TMP_RSA_CB,0,(char *)cb); }
+    {
+    union rsa_fn_to_char_u rsa_tmp_cb;
+
+    rsa_tmp_cb.fn_p = cb;
+    SSL_CTX_ctrl(ctx,SSL_CTRL_SET_TMP_RSA_CB,0,rsa_tmp_cb.char_p);
+    }
 #endif
 
 #ifndef NO_RSA
 void SSL_set_tmp_rsa_callback(SSL *ssl,RSA *(*cb)(SSL *ssl,int is_export,
 							  int keylength))
-    { SSL_ctrl(ssl,SSL_CTRL_SET_TMP_RSA_CB,0,(char *)cb); }
+    {
+    union rsa_fn_to_char_u rsa_tmp_cb;
+
+    rsa_tmp_cb.fn_p = cb;
+    SSL_ctrl(ssl,SSL_CTRL_SET_TMP_RSA_CB,0,rsa_tmp_cb.char_p);
+    }
 #endif
 
 #ifdef DOXYGEN
@@ -2008,11 +2030,21 @@ RSA *cb(SSL *ssl,int is_export,int keylength)
 #ifndef NO_DH
 void SSL_CTX_set_tmp_dh_callback(SSL_CTX *ctx,DH *(*dh)(SSL *ssl,int is_export,
 							int keylength))
-    { SSL_CTX_ctrl(ctx,SSL_CTRL_SET_TMP_DH_CB,0,(char *)dh); }
+    {
+    union dh_fn_to_char_u dh_tmp_cb;
+
+    dh_tmp_cb.fn_p = dh;
+    SSL_CTX_ctrl(ctx,SSL_CTRL_SET_TMP_DH_CB,0,dh_tmp_cb.char_p);
+    }
 
 void SSL_set_tmp_dh_callback(SSL *ssl,DH *(*dh)(SSL *ssl,int is_export,
 							int keylength))
-    { SSL_ctrl(ssl,SSL_CTRL_SET_TMP_DH_CB,0,(char *)dh); }
+    {
+    union dh_fn_to_char_u dh_tmp_cb;
+
+    dh_tmp_cb.fn_p = dh;
+    SSL_ctrl(ssl,SSL_CTRL_SET_TMP_DH_CB,0,dh_tmp_cb.char_p);
+    }
 #endif
 
 #if defined(_WINDLL) && defined(WIN16)