From 385d81380cb8aa062b9d7e2c678419623c7db484 Mon Sep 17 00:00:00 2001
From: Geoff Thorpe <geoff@openssl.org>
Date: Fri, 1 Dec 2000 20:31:52 +0000
Subject: [PATCH] First step in tidying up the LHASH code. The callback
 prototypes (and casts) used in the lhash code are about as horrible and evil
 as they can be. For starters, the callback prototypes contain empty parameter
 lists. Yuck.

This first change defines clearer prototypes - including "typedef"'d
function pointer types to use as "hash" and "compare" callbacks, as well as
the callbacks passed to the lh_doall and lh_doall_arg iteration functions.
Now at least more explicit (and clear) casting is required in all of the
dependant code - and that should be included in this commit.

The next step will be to hunt down and obliterate some of the function
pointer casting being used when it's not necessary - a particularly evil
variant exists in the implementation of lh_doall.
---
 apps/ca.c                | 10 ++++++----
 apps/openssl.c           |  4 +++-
 crypto/conf/cnf_save.c   |  2 +-
 crypto/conf/conf_api.c   |  9 ++++++---
 crypto/conf/conf_def.c   |  2 +-
 crypto/err/err.c         |  6 ++++--
 crypto/lhash/lhash.c     | 23 +++++++++++++++--------
 crypto/lhash/lhash.h     | 15 ++++++++++-----
 crypto/mem_dbg.c         | 11 +++++++----
 crypto/objects/o_names.c |  7 ++++---
 crypto/objects/obj_dat.c |  8 ++++----
 crypto/txt_db/txt_db.c   |  2 +-
 crypto/txt_db/txt_db.h   |  2 +-
 ssl/ssl_lib.c            |  3 ++-
 ssl/ssl_sess.c           |  2 +-
 15 files changed, 66 insertions(+), 40 deletions(-)

diff --git a/apps/ca.c b/apps/ca.c
index 8184f2efca..2e00555880 100644
--- a/apps/ca.c
+++ b/apps/ca.c
@@ -753,15 +753,17 @@ bad:
 		BIO_printf(bio_err,"generating index\n");
 		}
 	
-	if (!TXT_DB_create_index(db,DB_serial,NULL,index_serial_hash,
-		index_serial_cmp))
+	if (!TXT_DB_create_index(db, DB_serial, NULL,
+			(LHASH_HASH_FN_TYPE)index_serial_hash,
+			(LHASH_COMP_FN_TYPE)index_serial_cmp))
 		{
 		BIO_printf(bio_err,"error creating serial number index:(%ld,%ld,%ld)\n",db->error,db->arg1,db->arg2);
 		goto err;
 		}
 
-	if (!TXT_DB_create_index(db,DB_name,index_name_qual,index_name_hash,
-		index_name_cmp))
+	if (!TXT_DB_create_index(db, DB_name, index_name_qual,
+			(LHASH_HASH_FN_TYPE)index_name_hash,
+			(LHASH_COMP_FN_TYPE)index_name_cmp))
 		{
 		BIO_printf(bio_err,"error creating name index:(%ld,%ld,%ld)\n",
 			db->error,db->arg1,db->arg2);
diff --git a/apps/openssl.c b/apps/openssl.c
index cbb77b0c0a..40bcb76341 100644
--- a/apps/openssl.c
+++ b/apps/openssl.c
@@ -351,7 +351,9 @@ static LHASH *prog_init(void)
 	    ;
 	qsort(functions,i,sizeof *functions,SortFnByName);
 
-	if ((ret=lh_new(hash,cmp)) == NULL) return(NULL);
+	if ((ret=lh_new((LHASH_HASH_FN_TYPE)hash,
+			(LHASH_COMP_FN_TYPE)cmp)) == NULL)
+		return(NULL);
 
 	for (f=functions; f->name != NULL; f++)
 		lh_insert(ret,f);
diff --git a/crypto/conf/cnf_save.c b/crypto/conf/cnf_save.c
index e907cc2242..efbb61373e 100644
--- a/crypto/conf/cnf_save.c
+++ b/crypto/conf/cnf_save.c
@@ -73,7 +73,7 @@ main()
 		exit(1);
 		}
 
-	lh_doall(conf,print_conf);
+	lh_doall(conf,(LHASH_DOALL_FN_TYPE)print_conf);
 	}
 
 
diff --git a/crypto/conf/conf_api.c b/crypto/conf/conf_api.c
index 7abeeced07..4d30c6835c 100644
--- a/crypto/conf/conf_api.c
+++ b/crypto/conf/conf_api.c
@@ -181,7 +181,8 @@ int _CONF_new_data(CONF *conf)
 		return 0;
 		}
 	if (conf->data == NULL)
-		if ((conf->data = lh_new(hash,cmp_conf)) == NULL)
+		if ((conf->data = lh_new((LHASH_HASH_FN_TYPE)hash,
+					(LHASH_COMP_FN_TYPE)cmp_conf)) == NULL)
 			{
 			return 0;
 			}
@@ -194,12 +195,14 @@ void _CONF_free_data(CONF *conf)
 
 	conf->data->down_load=0; /* evil thing to make sure the 'OPENSSL_free()'
 				  * works as expected */
-	lh_doall_arg(conf->data,(void (*)())value_free_hash,conf->data);
+	lh_doall_arg(conf->data, (LHASH_DOALL_ARG_FN_TYPE)value_free_hash,
+			conf->data);
 
 	/* We now have only 'section' entries in the hash table.
 	 * Due to problems with */
 
-	lh_doall_arg(conf->data,(void (*)())value_free_stack,conf->data);
+	lh_doall_arg(conf->data, (LHASH_DOALL_ARG_FN_TYPE)value_free_stack,
+			conf->data);
 	lh_free(conf->data);
 	}
 
diff --git a/crypto/conf/conf_def.c b/crypto/conf/conf_def.c
index 6825d96455..1d30f6f771 100644
--- a/crypto/conf/conf_def.c
+++ b/crypto/conf/conf_def.c
@@ -712,7 +712,7 @@ static void dump_value(CONF_VALUE *a, BIO *out)
 
 static int def_dump(CONF *conf, BIO *out)
 	{
-	lh_doall_arg(conf->data, (void (*)())dump_value, out);
+	lh_doall_arg(conf->data, (LHASH_DOALL_ARG_FN_TYPE)dump_value, out);
 	return 1;
 	}
 
diff --git a/crypto/err/err.c b/crypto/err/err.c
index 99272e437c..34f4adaeb2 100644
--- a/crypto/err/err.c
+++ b/crypto/err/err.c
@@ -316,7 +316,8 @@ void ERR_load_strings(int lib, ERR_STRING_DATA *str)
 	if (error_hash == NULL)
 		{
 		CRYPTO_w_lock(CRYPTO_LOCK_ERR_HASH);
-		error_hash=lh_new(err_hash,err_cmp);
+		error_hash=lh_new((LHASH_HASH_FN_TYPE)err_hash,
+				(LHASH_COMP_FN_TYPE)err_cmp);
 		if (error_hash == NULL)
 			{
 			CRYPTO_w_unlock(CRYPTO_LOCK_ERR_HASH);
@@ -706,7 +707,8 @@ ERR_STATE *ERR_get_state(void)
 		/* no entry yet in thread_hash for current thread -
 		 * thus, it may have changed since we last looked at it */
 		if (thread_hash == NULL)
-			thread_hash = lh_new(pid_hash, pid_cmp);
+			thread_hash = lh_new((LHASH_HASH_FN_TYPE)pid_hash,
+					(LHASH_COMP_FN_TYPE)pid_cmp);
 		if (thread_hash == NULL)
 			thread_state_exists = 0; /* allocation error */
 		else
diff --git a/crypto/lhash/lhash.c b/crypto/lhash/lhash.c
index cdcc3b6e4d..60699f45cc 100644
--- a/crypto/lhash/lhash.c
+++ b/crypto/lhash/lhash.c
@@ -111,7 +111,7 @@ static void expand(LHASH *lh);
 static void contract(LHASH *lh);
 static LHASH_NODE **getrn(LHASH *lh, void *data, unsigned long *rhash);
 
-LHASH *lh_new(unsigned long (*h)(), int (*c)())
+LHASH *lh_new(LHASH_HASH_FN_TYPE h, LHASH_COMP_FN_TYPE c)
 	{
 	LHASH *ret;
 	int i;
@@ -122,8 +122,8 @@ LHASH *lh_new(unsigned long (*h)(), int (*c)())
 		goto err1;
 	for (i=0; i<MIN_NODES; i++)
 		ret->b[i]=NULL;
-	ret->comp=((c == NULL)?(int (*)())strcmp:c);
-	ret->hash=((h == NULL)?(unsigned long (*)())lh_strhash:h);
+	ret->comp=((c == NULL)?(LHASH_COMP_FN_TYPE)strcmp:c);
+	ret->hash=((h == NULL)?(LHASH_HASH_FN_TYPE)lh_strhash:h);
 	ret->num_nodes=MIN_NODES/2;
 	ret->num_alloc_nodes=MIN_NODES;
 	ret->p=0;
@@ -267,12 +267,19 @@ void *lh_retrieve(LHASH *lh, void *data)
 	return(ret);
 	}
 
-void lh_doall(LHASH *lh, void (*func)())
+void lh_doall(LHASH *lh, LHASH_DOALL_FN_TYPE func)
 	{
-	lh_doall_arg(lh,func,NULL);
+	/* Yikes that's bad - we're accepting a function that accepts 2
+	 * parameters (albeit we have to waive type-safety here) and then
+	 * forcibly calling that callback with *3* parameters leaving the 3rd
+	 * NULL. Obviously this "works" otherwise it wouldn't have survived so
+	 * long, but is it "good"??
+	 * FIXME: Use an internal function from this and the "_arg" version that
+	 * doesn't assume the ability to mutate function prototypes so badly. */
+	lh_doall_arg(lh, (LHASH_DOALL_ARG_FN_TYPE)func, NULL);
 	}
 
-void lh_doall_arg(LHASH *lh, void (*func)(), void *arg)
+void lh_doall_arg(LHASH *lh, LHASH_DOALL_ARG_FN_TYPE func, void *arg)
 	{
 	int i;
 	LHASH_NODE *a,*n;
@@ -312,7 +319,7 @@ static void expand(LHASH *lh)
 #ifndef NO_HASH_COMP
 		hash=np->hash;
 #else
-		hash=(*(lh->hash))(np->data);
+		hash=lh->hash(np->data);
 		lh->num_hash_calls++;
 #endif
 		if ((hash%nni) != p)
@@ -415,7 +422,7 @@ static LHASH_NODE **getrn(LHASH *lh, void *data, unsigned long *rhash)
 			}
 #endif
 		lh->num_comp_calls++;
-		if ((*cf)(n1->data,data) == 0)
+		if(cf(n1->data,data) == 0)
 			break;
 		ret= &(n1->next);
 		}
diff --git a/crypto/lhash/lhash.h b/crypto/lhash/lhash.h
index 28e8f1ef0a..0c1e2d2338 100644
--- a/crypto/lhash/lhash.h
+++ b/crypto/lhash/lhash.h
@@ -84,11 +84,16 @@ typedef struct lhash_node_st
 #endif
 	} LHASH_NODE;
 
+typedef int (*LHASH_COMP_FN_TYPE)(void *, void *);
+typedef unsigned long (*LHASH_HASH_FN_TYPE)(void *);
+typedef void (*LHASH_DOALL_FN_TYPE)(void *);
+typedef void (*LHASH_DOALL_ARG_FN_TYPE)(void *, void *);
+
 typedef struct lhash_st
 	{
 	LHASH_NODE **b;
-	int (*comp)();
-	unsigned long (*hash)();
+	LHASH_COMP_FN_TYPE comp;
+	LHASH_HASH_FN_TYPE hash;
 	unsigned int num_nodes;
 	unsigned int num_alloc_nodes;
 	unsigned int p;
@@ -120,13 +125,13 @@ typedef struct lhash_st
  * in lh_insert(). */
 #define lh_error(lh)	((lh)->error)
 
-LHASH *lh_new(unsigned long (*h)(/* void *a */), int (*c)(/* void *a,void *b */));
+LHASH *lh_new(LHASH_HASH_FN_TYPE h, LHASH_COMP_FN_TYPE c);
 void lh_free(LHASH *lh);
 void *lh_insert(LHASH *lh, void *data);
 void *lh_delete(LHASH *lh, void *data);
 void *lh_retrieve(LHASH *lh, void *data);
-    void lh_doall(LHASH *lh, void (*func)(/*void *b*/));
-void lh_doall_arg(LHASH *lh, void (*func)(/*void *a,void *b*/),void *arg);
+void lh_doall(LHASH *lh, LHASH_DOALL_FN_TYPE func);
+void lh_doall_arg(LHASH *lh, LHASH_DOALL_ARG_FN_TYPE func, void *arg);
 unsigned long lh_strhash(const char *c);
 unsigned long lh_num_items(const LHASH *lh);
 
diff --git a/crypto/mem_dbg.c b/crypto/mem_dbg.c
index 61329b098d..eb45516bdb 100644
--- a/crypto/mem_dbg.c
+++ b/crypto/mem_dbg.c
@@ -302,7 +302,8 @@ int CRYPTO_push_info_(const char *info, const char *file, int line)
 			}
 		if (amih == NULL)
 			{
-			if ((amih=lh_new(app_info_hash,app_info_cmp)) == NULL)
+			if ((amih=lh_new((LHASH_HASH_FN_TYPE)app_info_hash,
+					(LHASH_COMP_FN_TYPE)app_info_cmp)) == NULL)
 				{
 				OPENSSL_free(ami);
 				ret=0;
@@ -394,7 +395,8 @@ void CRYPTO_dbg_malloc(void *addr, int num, const char *file, int line,
 				}
 			if (mh == NULL)
 				{
-				if ((mh=lh_new(mem_hash,mem_cmp)) == NULL)
+				if ((mh=lh_new((LHASH_HASH_FN_TYPE)mem_hash,
+					(LHASH_COMP_FN_TYPE)mem_cmp)) == NULL)
 					{
 					OPENSSL_free(addr);
 					OPENSSL_free(m);
@@ -647,7 +649,8 @@ void CRYPTO_mem_leaks(BIO *b)
 	ml.chunks=0;
 	MemCheck_off(); /* obtains CRYPTO_LOCK_MALLOC2 */
 	if (mh != NULL)
-		lh_doall_arg(mh,(void (*)())print_leak,(char *)&ml);
+		lh_doall_arg(mh, (LHASH_DOALL_ARG_FN_TYPE)print_leak,
+				(char *)&ml);
 	if (ml.chunks != 0)
 		{
 		sprintf(buf,"%ld bytes leaked in %d chunks\n",
@@ -725,6 +728,6 @@ void CRYPTO_mem_leaks_cb(void (*cb)(unsigned long, const char *, int, int, void
 	{
 	if (mh == NULL) return;
 	CRYPTO_w_lock(CRYPTO_LOCK_MALLOC2);
-	lh_doall_arg(mh,(void (*)())cb_leak,(void *)&cb);
+	lh_doall_arg(mh, (LHASH_DOALL_ARG_FN_TYPE)cb_leak,(void *)&cb);
 	CRYPTO_w_unlock(CRYPTO_LOCK_MALLOC2);
 	}
diff --git a/crypto/objects/o_names.c b/crypto/objects/o_names.c
index 288f008149..db37ccf47c 100644
--- a/crypto/objects/o_names.c
+++ b/crypto/objects/o_names.c
@@ -31,7 +31,8 @@ int OBJ_NAME_init(void)
 	{
 	if (names_lh != NULL) return(1);
 	MemCheck_off();
-	names_lh=lh_new(obj_name_hash,obj_name_cmp);
+	names_lh=lh_new((LHASH_HASH_FN_TYPE)obj_name_hash,
+			(LHASH_COMP_FN_TYPE)obj_name_cmp);
 	MemCheck_on();
 	return(names_lh != NULL);
 	}
@@ -245,7 +246,7 @@ void OBJ_NAME_do_all(int type,void (*fn)(const OBJ_NAME *,void *arg),void *arg)
 	d.fn=fn;
 	d.arg=arg;
 
-	lh_doall_arg(names_lh,do_all_fn,&d);
+	lh_doall_arg(names_lh,(LHASH_DOALL_ARG_FN_TYPE)do_all_fn,&d);
 	}
 
 struct doall_sorted
@@ -320,7 +321,7 @@ void OBJ_NAME_cleanup(int type)
 	down_load=names_lh->down_load;
 	names_lh->down_load=0;
 
-	lh_doall(names_lh,names_lh_free);
+	lh_doall(names_lh,(LHASH_DOALL_FN_TYPE)names_lh_free);
 	if (type < 0)
 		{
 		lh_free(names_lh);
diff --git a/crypto/objects/obj_dat.c b/crypto/objects/obj_dat.c
index 4b1bb9583a..e5c7ab7b66 100644
--- a/crypto/objects/obj_dat.c
+++ b/crypto/objects/obj_dat.c
@@ -177,7 +177,7 @@ static int add_cmp(ADDED_OBJ *ca, ADDED_OBJ *cb)
 static int init_added(void)
 	{
 	if (added != NULL) return(1);
-	added=lh_new(add_hash,add_cmp);
+	added=lh_new((LHASH_HASH_FN_TYPE)add_hash,(LHASH_COMP_FN_TYPE)add_cmp);
 	return(added != NULL);
 	}
 
@@ -203,9 +203,9 @@ void OBJ_cleanup(void)
 	{
 	if (added == NULL) return;
 	added->down_load=0;
-	lh_doall(added,cleanup1); /* zero counters */
-	lh_doall(added,cleanup2); /* set counters */
-	lh_doall(added,cleanup3); /* free objects */
+	lh_doall(added,(LHASH_DOALL_FN_TYPE)cleanup1); /* zero counters */
+	lh_doall(added,(LHASH_DOALL_FN_TYPE)cleanup2); /* set counters */
+	lh_doall(added,(LHASH_DOALL_FN_TYPE)cleanup3); /* free objects */
 	lh_free(added);
 	added=NULL;
 	}
diff --git a/crypto/txt_db/txt_db.c b/crypto/txt_db/txt_db.c
index 3b04fe280c..eb13f6040a 100644
--- a/crypto/txt_db/txt_db.c
+++ b/crypto/txt_db/txt_db.c
@@ -211,7 +211,7 @@ char **TXT_DB_get_by_index(TXT_DB *db, int idx, char **value)
 	}
 
 int TXT_DB_create_index(TXT_DB *db, int field, int (*qual)(),
-	     unsigned long (*hash)(), int (*cmp)())
+		LHASH_HASH_FN_TYPE hash, LHASH_COMP_FN_TYPE cmp)
 	{
 	LHASH *idx;
 	char *r;
diff --git a/crypto/txt_db/txt_db.h b/crypto/txt_db/txt_db.h
index 342533d40d..e530af6605 100644
--- a/crypto/txt_db/txt_db.h
+++ b/crypto/txt_db/txt_db.h
@@ -96,7 +96,7 @@ TXT_DB *TXT_DB_read(char *in, int num);
 long TXT_DB_write(char *out, TXT_DB *db);
 #endif
 int TXT_DB_create_index(TXT_DB *db,int field,int (*qual)(),
-	 unsigned long (*hash)(),int (*cmp)());
+		LHASH_HASH_FN_TYPE hash, LHASH_COMP_FN_TYPE cmp);
 void TXT_DB_free(TXT_DB *db);
 char **TXT_DB_get_by_index(TXT_DB *db, int idx, char **value);
 int TXT_DB_insert(TXT_DB *db,char **value);
diff --git a/ssl/ssl_lib.c b/ssl/ssl_lib.c
index 866cd182d4..28a1c67cd7 100644
--- a/ssl/ssl_lib.c
+++ b/ssl/ssl_lib.c
@@ -1164,7 +1164,8 @@ SSL_CTX *SSL_CTX_new(SSL_METHOD *meth)
 	ret->default_passwd_callback_userdata=NULL;
 	ret->client_cert_cb=NULL;
 
-	ret->sessions=lh_new(SSL_SESSION_hash,SSL_SESSION_cmp);
+	ret->sessions=lh_new((LHASH_HASH_FN_TYPE)SSL_SESSION_hash,
+			(LHASH_COMP_FN_TYPE)SSL_SESSION_cmp);
 	if (ret->sessions == NULL) goto err;
 	ret->cert_store=X509_STORE_new();
 	if (ret->cert_store == NULL) goto err;
diff --git a/ssl/ssl_sess.c b/ssl/ssl_sess.c
index 7064262def..830f1d9b0f 100644
--- a/ssl/ssl_sess.c
+++ b/ssl/ssl_sess.c
@@ -606,7 +606,7 @@ void SSL_CTX_flush_sessions(SSL_CTX *s, long t)
 	CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX);
 	i=tp.cache->down_load;
 	tp.cache->down_load=0;
-	lh_doall_arg(tp.cache,(void (*)())timeout,&tp);
+	lh_doall_arg(tp.cache, (LHASH_DOALL_ARG_FN_TYPE)timeout, &tp);
 	tp.cache->down_load=i;
 	CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX);
 	}
-- 
2.25.1