change lex_string_eq to return what it says

the function xxx_eq(a,b) returns true if two elements
are equal and false if they are not.

sql/lex_string.h

@@ -21,9 +21,8 @@
 typedef struct st_mysql_const_lex_string LEX_CSTRING;
 
 /* Functions to compare if two lex strings are equal */
-inline bool lex_string_cmp(CHARSET_INFO *charset,
-                           const LEX_CSTRING *a,
-                           const LEX_CSTRING *b)
+static inline bool lex_string_cmp(CHARSET_INFO *charset, const LEX_CSTRING *a,
+                                  const LEX_CSTRING *b)
 {
   return my_strcasecmp(charset, a->str, b->str);
 }
@@ -31,7 +30,7 @@ inline bool lex_string_cmp(CHARSET_INFO *charset,
 /*
   Compare to LEX_CSTRING's and return 0 if equal
 */
-inline bool cmp(const LEX_CSTRING *a, const LEX_CSTRING *b)
+static inline bool cmp(const LEX_CSTRING *a, const LEX_CSTRING *b)
 {
   return (a->length != b->length ||
           memcmp(a->str, b->str, a->length));
@@ -41,12 +40,11 @@ inline bool cmp(const LEX_CSTRING *a, const LEX_CSTRING *b)
   Compare if two LEX_CSTRING are equal. Assumption is that
   character set is ASCII (like for plugin names)
 */
-inline bool lex_string_eq(const LEX_CSTRING *a,
-                          const LEX_CSTRING *b)
+static inline bool lex_string_eq(const LEX_CSTRING *a, const LEX_CSTRING *b)
 {
   if (a->length != b->length)
-    return 1;                                   /* Different */
-  return strcasecmp(a->str, b->str) != 0;
+    return 0;                                   /* Different */
+  return strcasecmp(a->str, b->str) == 0;
 }
 
 #endif /* LEX_STRING_INCLUDED */

sql/sql_acl.cc

@@ -1482,10 +1482,10 @@ static const char *fix_plugin_ptr(const char *name)
 */
 static bool fix_user_plugin_ptr(ACL_USER *user)
 {
-  if (lex_string_eq(&user->plugin, &native_password_plugin_name) == 0)
+  if (lex_string_eq(&user->plugin, &native_password_plugin_name))
     user->plugin= native_password_plugin_name;
   else
-  if (lex_string_eq(&user->plugin, &old_password_plugin_name) == 0)
+  if (lex_string_eq(&user->plugin, &old_password_plugin_name))
     user->plugin= old_password_plugin_name;
   else
     return true;
@@ -1525,10 +1525,10 @@ static bool fix_lex_user(THD *thd, LEX_USER *user)
   DBUG_ASSERT(user->plugin.length || !user->auth.length);
   DBUG_ASSERT(!(user->plugin.length && (user->pwtext.length || user->pwhash.length)));
 
-  if (lex_string_eq(&user->plugin, &native_password_plugin_name) == 0)
+  if (lex_string_eq(&user->plugin, &native_password_plugin_name))
     check_length= SCRAMBLED_PASSWORD_CHAR_LENGTH;
   else
-  if (lex_string_eq(&user->plugin, &old_password_plugin_name) == 0)
+  if (lex_string_eq(&user->plugin, &old_password_plugin_name))
     check_length= SCRAMBLED_PASSWORD_CHAR_LENGTH_323;
   else
   if (user->plugin.length)
@@ -11213,7 +11213,7 @@ applicable_roles_insert(ACL_USER_BASE *grantee, ACL_ROLE *role, void *ptr)
   if (!is_role)
   {
     if (data->user->default_rolename.length &&
-        !lex_string_eq(&data->user->default_rolename, &role->user))
+        lex_string_eq(&data->user->default_rolename, &role->user))
       table->field[3]->store(STRING_WITH_LEN("YES"), cs);
     else
       table->field[3]->store(STRING_WITH_LEN("NO"), cs);
@@ -12825,8 +12825,7 @@ static ulong parse_client_handshake_packet(MPVIO_EXT *mpvio,
     restarted and a server auth plugin will read the data that the client
     has just send. Cache them to return in the next server_mpvio_read_packet().
   */
-  if (lex_string_eq(&mpvio->acl_user->plugin,
-                    plugin_name(mpvio->plugin)) != 0)
+  if (!lex_string_eq(&mpvio->acl_user->plugin, plugin_name(mpvio->plugin)))
   {
     mpvio->cached_client_reply.pkt= passwd;
     mpvio->cached_client_reply.pkt_len= (uint)passwd_len;
@@ -13256,7 +13255,7 @@ bool acl_authenticate(THD *thd, uint com_change_user_pkt_len)
   {
     DBUG_ASSERT(mpvio.acl_user);
     DBUG_ASSERT(command == COM_CHANGE_USER ||
-                lex_string_eq(auth_plugin_name, &mpvio.acl_user->plugin));
+                !lex_string_eq(auth_plugin_name, &mpvio.acl_user->plugin));
     auth_plugin_name= &mpvio.acl_user->plugin;
     res= do_auth_once(thd, auth_plugin_name, &mpvio);
   }

sql/table.cc

@@ -252,21 +252,21 @@ TABLE_CATEGORY get_table_category(const LEX_CSTRING *db,
   if (is_infoschema_db(db))
     return TABLE_CATEGORY_INFORMATION;
 
-  if (lex_string_eq(&PERFORMANCE_SCHEMA_DB_NAME, db) == 0)
+  if (lex_string_eq(&PERFORMANCE_SCHEMA_DB_NAME, db))
     return TABLE_CATEGORY_PERFORMANCE;
 
-  if (lex_string_eq(&MYSQL_SCHEMA_NAME, db) == 0)
+  if (lex_string_eq(&MYSQL_SCHEMA_NAME, db))
   {
     if (is_system_table_name(name->str, name->length))
       return TABLE_CATEGORY_SYSTEM;
 
-    if (lex_string_eq(&GENERAL_LOG_NAME, name) == 0)
+    if (lex_string_eq(&GENERAL_LOG_NAME, name))
       return TABLE_CATEGORY_LOG;
 
-    if (lex_string_eq(&SLOW_LOG_NAME, name) == 0)
+    if (lex_string_eq(&SLOW_LOG_NAME, name))
       return TABLE_CATEGORY_LOG;
 
-    if (lex_string_eq(&TRANSACTION_REG_NAME, name) == 0)
+    if (lex_string_eq(&TRANSACTION_REG_NAME, name))
       return TABLE_CATEGORY_LOG;
   }