cleanup: more 'const' qualifiers

sql/keycaches.cc

@@ -103,7 +103,7 @@ LEX_STRING default_key_cache_base= {C_STRING_WITH_LEN("default")};
 
 KEY_CACHE zero_key_cache; ///< @@nonexistent_cache.param->value_ptr() points here
 
-KEY_CACHE *get_key_cache(LEX_STRING *cache_name)
+KEY_CACHE *get_key_cache(const LEX_STRING *cache_name)
 {
   if (!cache_name || ! cache_name->length)
     cache_name= &default_key_cache_base;

sql/keycaches.h

@@ -40,7 +40,7 @@ extern KEY_CACHE zero_key_cache;
 extern NAMED_ILIST key_caches;
 
 KEY_CACHE *create_key_cache(const char *name, uint length);
-KEY_CACHE *get_key_cache(LEX_STRING *cache_name);
+KEY_CACHE *get_key_cache(const LEX_STRING *cache_name);
 KEY_CACHE *get_or_create_key_cache(const char *name, uint length);
 void free_key_cache(const char *name, KEY_CACHE *key_cache);
 bool process_key_caches(process_key_cache_t func, void *param);

sql/rpl_mi.cc

@@ -1078,7 +1078,7 @@ bool Master_info_index::write_master_name_to_index_file(LEX_STRING *name,
 */
 
 Master_info *
-Master_info_index::get_master_info(LEX_STRING *connection_name,
+Master_info_index::get_master_info(const LEX_STRING *connection_name,
                                    Sql_condition::enum_warning_level warning)
 {
   Master_info *mi;

sql/rpl_mi.h

@@ -209,7 +209,7 @@ class Master_info_index
                                    const char *host, uint port);
   bool add_master_info(Master_info *mi, bool write_to_file);
   bool remove_master_info(LEX_STRING *connection_name);
-  Master_info *get_master_info(LEX_STRING *connection_name,
+  Master_info *get_master_info(const LEX_STRING *connection_name,
                                Sql_condition::enum_warning_level warning);
   bool give_error_if_slave_running();
   bool start_all_slaves(THD *thd);

sql/set_var.cc

@@ -200,12 +200,12 @@ bool sys_var::update(THD *thd, set_var *var)
       (on_update && on_update(this, thd, OPT_SESSION));
 }
 
-uchar *sys_var::session_value_ptr(THD *thd, LEX_STRING *base)
+uchar *sys_var::session_value_ptr(THD *thd, const LEX_STRING *base)
 {
   return session_var_ptr(thd);
 }
 
-uchar *sys_var::global_value_ptr(THD *thd, LEX_STRING *base)
+uchar *sys_var::global_value_ptr(THD *thd, const LEX_STRING *base)
 {
   return global_var_ptr();
 }
@@ -238,7 +238,7 @@ bool sys_var::check(THD *thd, set_var *var)
   return false;
 }
 
-uchar *sys_var::value_ptr(THD *thd, enum_var_type type, LEX_STRING *base)
+uchar *sys_var::value_ptr(THD *thd, enum_var_type type, const LEX_STRING *base)
 {
   if (type == OPT_GLOBAL || scope() == GLOBAL)
   {

sql/set_var.h

@@ -107,7 +107,7 @@ class sys_var
   virtual sys_var_pluginvar *cast_pluginvar() { return 0; }
 
   bool check(THD *thd, set_var *var);
-  uchar *value_ptr(THD *thd, enum_var_type type, LEX_STRING *base);
+  uchar *value_ptr(THD *thd, enum_var_type type, const LEX_STRING *base);
 
   /**
      Update the system variable with the default value from either
@@ -208,8 +208,8 @@ class sys_var
     It must be of show_val_type type (bool for SHOW_BOOL, int for SHOW_INT,
     longlong for SHOW_LONGLONG, etc).
   */
-  virtual uchar *session_value_ptr(THD *thd, LEX_STRING *base);
-  virtual uchar *global_value_ptr(THD *thd, LEX_STRING *base);
+  virtual uchar *session_value_ptr(THD *thd, const LEX_STRING *base);
+  virtual uchar *global_value_ptr(THD *thd, const LEX_STRING *base);
 
   /**
     A pointer to a storage area of the variable, to the raw data.

sql/sql_plugin.cc

@@ -261,10 +261,10 @@ class sys_var_pluginvar: public sys_var, public Sql_alloc
   sys_var_pluginvar *cast_pluginvar() { return this; }
   uchar* real_value_ptr(THD *thd, enum_var_type type);
   TYPELIB* plugin_var_typelib(void);
-  uchar* do_value_ptr(THD *thd, enum_var_type type, LEX_STRING *base);
-  uchar* session_value_ptr(THD *thd, LEX_STRING *base)
+  uchar* do_value_ptr(THD *thd, enum_var_type type, const LEX_STRING *base);
+  uchar* session_value_ptr(THD *thd, const LEX_STRING *base)
   { return do_value_ptr(thd, OPT_SESSION, base); }
-  uchar* global_value_ptr(THD *thd, LEX_STRING *base)
+  uchar* global_value_ptr(THD *thd, const LEX_STRING *base)
   { return do_value_ptr(thd, OPT_GLOBAL, base); }
   bool do_check(THD *thd, set_var *var);
   virtual void session_save_default(THD *thd, set_var *var) {}
@@ -3270,7 +3270,7 @@ TYPELIB* sys_var_pluginvar::plugin_var_typelib(void)
 
 
 uchar* sys_var_pluginvar::do_value_ptr(THD *thd, enum_var_type type,
-                                       LEX_STRING *base)
+                                       const LEX_STRING *base)
 {
   uchar* result;
 

sql/sys_vars.cc

@@ -1477,7 +1477,7 @@ static Sys_var_gtid_binlog_pos Sys_gtid_binlog_pos(
 
 
 uchar *
-Sys_var_gtid_binlog_pos::global_value_ptr(THD *thd, LEX_STRING *base)
+Sys_var_gtid_binlog_pos::global_value_ptr(THD *thd, const LEX_STRING *base)
 {
   char buf[128];
   String str(buf, sizeof(buf), system_charset_info);
@@ -1505,7 +1505,7 @@ static Sys_var_gtid_current_pos Sys_gtid_current_pos(
 
 
 uchar *
-Sys_var_gtid_current_pos::global_value_ptr(THD *thd, LEX_STRING *base)
+Sys_var_gtid_current_pos::global_value_ptr(THD *thd, const LEX_STRING *base)
 {
   String str;
   char *p;
@@ -1590,7 +1590,7 @@ Sys_var_gtid_slave_pos::global_update(THD *thd, set_var *var)
 
 
 uchar *
-Sys_var_gtid_slave_pos::global_value_ptr(THD *thd, LEX_STRING *base)
+Sys_var_gtid_slave_pos::global_value_ptr(THD *thd, const LEX_STRING *base)
 {
   String str;
   char *p;
@@ -1708,7 +1708,7 @@ Sys_var_gtid_binlog_state::global_update(THD *thd, set_var *var)
 
 
 uchar *
-Sys_var_gtid_binlog_state::global_value_ptr(THD *thd, LEX_STRING *base)
+Sys_var_gtid_binlog_state::global_value_ptr(THD *thd, const LEX_STRING *base)
 {
   char buf[512];
   String str(buf, sizeof(buf), system_charset_info);
@@ -1741,7 +1741,7 @@ static Sys_var_last_gtid Sys_last_gtid(
 
 
 uchar *
-Sys_var_last_gtid::session_value_ptr(THD *thd, LEX_STRING *base)
+Sys_var_last_gtid::session_value_ptr(THD *thd, const LEX_STRING *base)
 {
   char buf[10+1+10+1+20+1];
   String str(buf, sizeof(buf), system_charset_info);
@@ -4123,7 +4123,7 @@ bool Sys_var_rpl_filter::set_filter_value(const char *value, Master_info *mi)
   return status;
 }
 
-uchar *Sys_var_rpl_filter::global_value_ptr(THD *thd, LEX_STRING *base)
+uchar *Sys_var_rpl_filter::global_value_ptr(THD *thd, const LEX_STRING *base)
 {
   char buf[256];
   String tmp(buf, sizeof(buf), &my_charset_bin);