FM / private

/usr/include/mysql/server/private

Name	Size	Mode	Actions
atomic/	-	0755	rm
data/	-	0755	rm
providers/	-	0755	rm
aligned.h	1136	0644	edit dl rm
aria_backup.h	1787	0644	edit dl rm
assume_aligned.h	2350	0644	edit dl rm
authors.h	10141	0644	edit dl rm
backup.h	1703	0644	edit dl rm
bounded_queue.h	6093	0644	edit dl rm
client_settings.h	1935	0644	edit dl rm
compat56.h	2280	0644	edit dl rm
config.h	14543	0644	edit dl rm
contributors.h	4878	0644	edit dl rm
create_options.h	4193	0644	edit dl rm
create_tmp_table.h	2808	0644	edit dl rm
cset_narrowing.h	3968	0644	edit dl rm
custom_conf.h	1082	0644	edit dl rm
datadict.h	1700	0644	edit dl rm
ddl_log.h	12807	0644	edit dl rm
debug.h	1234	0644	edit dl rm
debug_sync.h	2046	0644	edit dl rm
derived_handler.h	2379	0644	edit dl rm
derror.h	980	0644	edit dl rm
des_key_file.h	1236	0644	edit dl rm
discover.h	1570	0644	edit dl rm
dur_prop.h	1082	0644	edit dl rm
embedded_priv.h	1733	0644	edit dl rm
events.h	4704	0644	edit dl rm
event_data_objects.h	4187	0644	edit dl rm
event_db_repository.h	3648	0644	edit dl rm
event_parse_data.h	2899	0644	edit dl rm
event_queue.h	3438	0644	edit dl rm
event_scheduler.h	3290	0644	edit dl rm
field.h	222336	0644	edit dl rm
field_comp.h	1174	0644	edit dl rm
filesort.h	7283	0644	edit dl rm
filesort_utils.h	8195	0644	edit dl rm
ft_global.h	3113	0644	edit dl rm
gcalc_slicescan.h	17272	0644	edit dl rm
gcalc_tools.h	11900	0644	edit dl rm
grant.h	2758	0644	edit dl rm
group_by_handler.h	3534	0644	edit dl rm
gstream.h	2437	0644	edit dl rm
handler.h	199730	0644	edit dl rm
handle_connections_win.h	884	0644	edit dl rm
hash.h	4452	0644	edit dl rm
hash_filo.h	5688	0644	edit dl rm
ha_handler_stats.h	2335	0644	edit dl rm
ha_partition.h	64696	0644	edit dl rm
ha_sequence.h	6245	0644	edit dl rm
heap.h	9480	0644	edit dl rm
hostname.h	5419	0644	edit dl rm
ilist.h	7237	0644	edit dl rm
init.h	852	0644	edit dl rm
innodb_priv.h	1319	0644	edit dl rm
item.h	283188	0644	edit dl rm
item_cmpfunc.h	135071	0644	edit dl rm
item_create.h	11508	0644	edit dl rm
item_func.h	138638	0644	edit dl rm
item_geofunc.h	39612	0644	edit dl rm
item_jsonfunc.h	25264	0644	edit dl rm
item_row.h	5229	0644	edit dl rm
item_strfunc.h	74995	0644	edit dl rm
item_subselect.h	59028	0644	edit dl rm
item_sum.h	72695	0644	edit dl rm
item_timefunc.h	65896	0644	edit dl rm
item_vers.h	4413	0644	edit dl rm
item_windowfunc.h	34556	0644	edit dl rm
item_xmlfunc.h	4650	0644	edit dl rm
json_table.h	9667	0644	edit dl rm
key.h	2132	0644	edit dl rm
keycaches.h	1995	0644	edit dl rm
lex.h	29840	0644	edit dl rm
lex_charset.h	24313	0644	edit dl rm
lex_hash.h	143108	0644	edit dl rm
lex_ident.h	2122	0644	edit dl rm
lex_string.h	4077	0644	edit dl rm
lex_symbol.h	1323	0644	edit dl rm
lex_token.h	42641	0644	edit dl rm
lf.h	6462	0644	edit dl rm
lock.h	2220	0644	edit dl rm
log.h	46370	0644	edit dl rm
log_event.h	189106	0644	edit dl rm
log_event_data_type.h	1890	0644	edit dl rm
log_event_old.h	19830	0644	edit dl rm
log_slow.h	2442	0644	edit dl rm
maria.h	5872	0644	edit dl rm
mariadb.h	1277	0644	edit dl rm
mdl.h	38503	0644	edit dl rm
mem_root_array.h	7106	0644	edit dl rm
message.h	1195	0644	edit dl rm
multi_range_read.h	23179	0644	edit dl rm
myisam.h	17506	0644	edit dl rm
myisamchk.h	4734	0644	edit dl rm
myisammrg.h	4897	0644	edit dl rm
myisampack.h	14929	0644	edit dl rm
mysqld.h	41063	0644	edit dl rm
mysqld_default_groups.h	204	0644	edit dl rm
mysqld_suffix.h	1201	0644	edit dl rm
mysys_err.h	3022	0644	edit dl rm
my_alarm.h	2429	0644	edit dl rm
my_apc.h	4747	0644	edit dl rm
my_atomic.h	7281	0644	edit dl rm
my_atomic_wrapper.h	3051	0644	edit dl rm
my_base.h	27656	0644	edit dl rm
my_bit.h	6196	0644	edit dl rm
my_bitmap.h	5502	0644	edit dl rm
my_check_opt.h	2618	0644	edit dl rm
my_compare.h	11194	0644	edit dl rm
my_counter.h	1721	0644	edit dl rm
my_cpu.h	4855	0644	edit dl rm
my_crypt.h	904	0644	edit dl rm
my_decimal.h	14489	0644	edit dl rm
my_default.h	1880	0644	edit dl rm
my_handler_errors.h	4882	0644	edit dl rm
my_json_writer.h	18573	0644	edit dl rm
my_libwrap.h	1183	0644	edit dl rm
my_md5.h	1486	0644	edit dl rm
my_minidump.h	848	0644	edit dl rm
my_nosys.h	1438	0644	edit dl rm
my_rdtsc.h	10119	0644	edit dl rm
my_rnd.h	1014	0644	edit dl rm
my_service_manager.h	2087	0644	edit dl rm
my_stacktrace.h	3215	0644	edit dl rm
my_stack_alloc.h	6493	0644	edit dl rm
my_time.h	10414	0644	edit dl rm
my_tree.h	3991	0644	edit dl rm
my_uctype.h	69528	0644	edit dl rm
my_user.h	1126	0644	edit dl rm
my_virtual_mem.h	1127	0644	edit dl rm
opt_histogram_json.h	4638	0644	edit dl rm
opt_range.h	65903	0644	edit dl rm
opt_subselect.h	14545	0644	edit dl rm
opt_trace.h	8494	0644	edit dl rm
opt_trace_context.h	3291	0644	edit dl rm
parse_file.h	4387	0644	edit dl rm
partition_element.h	5428	0644	edit dl rm
partition_info.h	19864	0644	edit dl rm
password.h	1170	0644	edit dl rm
pfs_file_provider.h	3153	0644	edit dl rm
pfs_idle_provider.h	1385	0644	edit dl rm
pfs_memory_provider.h	1626	0644	edit dl rm
pfs_metadata_provider.h	1898	0644	edit dl rm
pfs_socket_provider.h	2258	0644	edit dl rm
pfs_stage_provider.h	1556	0644	edit dl rm
pfs_statement_provider.h	4347	0644	edit dl rm
pfs_table_provider.h	2625	0644	edit dl rm
pfs_thread_provider.h	5560	0644	edit dl rm
pfs_transaction_provider.h	2846	0644	edit dl rm
privilege.h	28889	0644	edit dl rm
probes_mysql.h	973	0644	edit dl rm
probes_mysql_nodtrace.h	6087	0644	edit dl rm
procedure.h	6819	0644	edit dl rm
protocol.h	12537	0644	edit dl rm
proxy_protocol.h	548	0644	edit dl rm
queues.h	3477	0644	edit dl rm
records.h	3147	0644	edit dl rm
replication.h	16130	0644	edit dl rm
repl_failsafe.h	1585	0644	edit dl rm
rijndael.h	1711	0644	edit dl rm
rowid_filter.h	15474	0644	edit dl rm
rpl_constants.h	3357	0644	edit dl rm
rpl_filter.h	4774	0644	edit dl rm
rpl_gtid.h	29939	0644	edit dl rm
rpl_injector.h	9621	0644	edit dl rm
rpl_mi.h	16638	0644	edit dl rm
rpl_parallel.h	18228	0644	edit dl rm
rpl_record.h	1585	0644	edit dl rm
rpl_record_old.h	1407	0644	edit dl rm
rpl_reporting.h	3713	0644	edit dl rm
rpl_rli.h	36070	0644	edit dl rm
rpl_tblmap.h	3177	0644	edit dl rm
rpl_utility.h	9630	0644	edit dl rm
scheduler.h	3199	0644	edit dl rm
scope.h	4393	0644	edit dl rm
select_handler.h	2228	0644	edit dl rm
semisync.h	2287	0644	edit dl rm
semisync_master.h	25766	0644	edit dl rm
semisync_master_ack_receiver.h	8709	0644	edit dl rm
semisync_slave.h	3736	0644	edit dl rm
service_versions.h	2285	0644	edit dl rm
session_tracker.h	14275	0644	edit dl rm
set_var.h	16551	0644	edit dl rm
slave.h	12275	0644	edit dl rm
socketpair.h	842	0644	edit dl rm
source_revision.h	67	0644	edit dl rm
sp.h	22588	0644	edit dl rm
span.h	3931	0644	edit dl rm
spatial.h	22698	0644	edit dl rm
sp_cache.h	2037	0644	edit dl rm
sp_head.h	64917	0644	edit dl rm
sp_pcontext.h	24893	0644	edit dl rm
sp_rcontext.h	14441	0644	edit dl rm
sql_acl.h	14167	0644	edit dl rm
sql_admin.h	2915	0644	edit dl rm
sql_alloc.h	1732	0644	edit dl rm
sql_alter.h	15395	0644	edit dl rm
sql_analyse.h	11125	0644	edit dl rm
sql_analyze_stmt.h	12683	0644	edit dl rm
sql_array.h	6858	0644	edit dl rm
sql_audit.h	14162	0644	edit dl rm
sql_base.h	26041	0644	edit dl rm
sql_basic_types.h	9523	0644	edit dl rm
sql_binlog.h	895	0644	edit dl rm
sql_bitmap.h	7842	0644	edit dl rm
sql_bootstrap.h	1812	0644	edit dl rm
sql_cache.h	21676	0644	edit dl rm
sql_callback.h	1542	0644	edit dl rm
sql_class.h	271120	0644	edit dl rm
sql_cmd.h	5962	0644	edit dl rm
sql_command.h	4800	0644	edit dl rm
sql_connect.h	4087	0644	edit dl rm
sql_const.h	11415	0644	edit dl rm
sql_crypt.h	1437	0644	edit dl rm
sql_cte.h	16494	0644	edit dl rm
sql_cursor.h	4239	0644	edit dl rm
sql_db.h	2438	0644	edit dl rm
sql_debug.h	5646	0644	edit dl rm
sql_delete.h	1343	0644	edit dl rm
sql_derived.h	1289	0644	edit dl rm
sql_digest.h	3819	0644	edit dl rm
sql_digest_stream.h	1567	0644	edit dl rm
sql_do.h	954	0644	edit dl rm
sql_error.h	39843	0644	edit dl rm
sql_explain.h	30319	0644	edit dl rm
sql_expression_cache.h	4359	0644	edit dl rm
sql_get_diagnostics.h	7883	0644	edit dl rm
sql_handler.h	2910	0644	edit dl rm
sql_help.h	995	0644	edit dl rm
sql_hset.h	3401	0644	edit dl rm
sql_insert.h	5173	0644	edit dl rm
sql_i_s.h	8487	0644	edit dl rm
sql_join_cache.h	48659	0644	edit dl rm
sql_lex.h	174693	0644	edit dl rm
sql_lifo_buffer.h	9676	0644	edit dl rm
sql_limit.h	3187	0644	edit dl rm
sql_list.h	22391	0644	edit dl rm
sql_load.h	1276	0644	edit dl rm
sql_locale.h	2701	0644	edit dl rm
sql_manager.h	960	0644	edit dl rm
sql_mode.h	6735	0644	edit dl rm
sql_parse.h	8970	0644	edit dl rm
sql_partition.h	12674	0644	edit dl rm
sql_partition_admin.h	5940	0644	edit dl rm
sql_plist.h	7711	0644	edit dl rm
sql_plugin.h	7577	0644	edit dl rm
sql_plugin_compat.h	2237	0644	edit dl rm
sql_prepare.h	11409	0644	edit dl rm
sql_priv.h	18474	0644	edit dl rm
sql_profile.h	7816	0644	edit dl rm
sql_reload.h	1036	0644	edit dl rm
sql_rename.h	982	0644	edit dl rm
sql_repl.h	3045	0644	edit dl rm
sql_schema.h	3303	0644	edit dl rm
sql_select.h	89743	0644	edit dl rm
sql_sequence.h	5177	0644	edit dl rm
sql_servers.h	1777	0644	edit dl rm
sql_show.h	9830	0644	edit dl rm
sql_signal.h	3362	0644	edit dl rm
sql_sort.h	21964	0644	edit dl rm
sql_statistics.h	16494	0644	edit dl rm
sql_string.h	39009	0644	edit dl rm
sql_table.h	9752	0644	edit dl rm
sql_test.h	1589	0644	edit dl rm
sql_time.h	8374	0644	edit dl rm
sql_trigger.h	12332	0644	edit dl rm
sql_truncate.h	2079	0644	edit dl rm
sql_tvc.h	2418	0644	edit dl rm
sql_type.h	296072	0644	edit dl rm
sql_type_fixedbin.h	65578	0644	edit dl rm
sql_type_fixedbin_storage.h	5467	0644	edit dl rm
sql_type_geom.h	19039	0644	edit dl rm
sql_type_int.h	10001	0644	edit dl rm
sql_type_json.h	6155	0644	edit dl rm
sql_type_real.h	1257	0644	edit dl rm
sql_type_string.h	1629	0644	edit dl rm
sql_udf.h	4850	0644	edit dl rm
sql_union.h	1068	0644	edit dl rm
sql_update.h	1923	0644	edit dl rm
sql_view.h	2470	0644	edit dl rm
sql_window.h	6814	0644	edit dl rm
ssl_compat.h	3380	0644	edit dl rm
strfunc.h	2275	0644	edit dl rm
structs.h	29530	0644	edit dl rm
sys_vars_shared.h	2729	0644	edit dl rm
table.h	118414	0644	edit dl rm
table_cache.h	4232	0644	edit dl rm
threadpool.h	4810	0644	edit dl rm
threadpool_generic.h	3969	0644	edit dl rm
threadpool_winsockets.h	2290	0644	edit dl rm
thread_cache.h	5905	0644	edit dl rm
thr_alarm.h	2932	0644	edit dl rm
thr_lock.h	7350	0644	edit dl rm
thr_malloc.h	1202	0644	edit dl rm
thr_timer.h	1563	0644	edit dl rm
transaction.h	1466	0644	edit dl rm
tzfile.h	5014	0644	edit dl rm
tztime.h	3397	0644	edit dl rm
t_ctype.h	5639	0644	edit dl rm
uniques.h	4217	0644	edit dl rm
unireg.h	7722	0644	edit dl rm
vers_string.h	2543	0644	edit dl rm
violite.h	10086	0644	edit dl rm
waiting_threads.h	4532	0644	edit dl rm
welcome_copyright_notice.h	1218	0644	edit dl rm
winservice.h	6019	0644	edit dl rm
win_tzname_data.h	6506	0644	edit dl rm
wqueue.h	1565	0644	edit dl rm
wsrep.h	3308	0644	edit dl rm
wsrep_allowlist_service.h	1035	0644	edit dl rm
wsrep_applier.h	2703	0644	edit dl rm
wsrep_binlog.h	3551	0644	edit dl rm
wsrep_client_service.h	2560	0644	edit dl rm
wsrep_client_state.h	1566	0644	edit dl rm
wsrep_condition_variable.h	1484	0644	edit dl rm
wsrep_high_priority_service.h	4912	0644	edit dl rm
wsrep_mutex.h	1239	0644	edit dl rm
wsrep_mysqld.h	21524	0644	edit dl rm
wsrep_mysqld_c.h	1227	0644	edit dl rm
wsrep_on.h	1718	0644	edit dl rm
wsrep_priv.h	1634	0644	edit dl rm
wsrep_schema.h	5608	0644	edit dl rm
wsrep_server_service.h	3631	0644	edit dl rm
wsrep_server_state.h	2529	0644	edit dl rm
wsrep_sst.h	3951	0644	edit dl rm
wsrep_status.h	1816	0644	edit dl rm
wsrep_storage_service.h	1809	0644	edit dl rm
wsrep_thd.h	11487	0644	edit dl rm
wsrep_trans_observer.h	18174	0644	edit dl rm
wsrep_types.h	1110	0644	edit dl rm
wsrep_utils.h	9807	0644	edit dl rm
wsrep_var.h	4491	0644	edit dl rm
wsrep_xid.h	1549	0644	edit dl rm
xa.h	1845	0644	edit dl rm

Edit: /usr/include/mysql/server/private/sql_string.h (39009B)

#ifndef SQL_STRING_INCLUDED
#define SQL_STRING_INCLUDED

/*
   Copyright (c) 2000, 2013, Oracle and/or its affiliates.
   Copyright (c) 2008, 2020, MariaDB Corporation.

This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; version 2 of the License.

This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335  USA */

/* This file is originally from the mysql distribution. Coded by monty */

#ifdef USE_PRAGMA_INTERFACE
#pragma interface			/* gcc class implementation */
#endif

#include "m_ctype.h"                            /* my_charset_bin */
#include <my_sys.h>              /* alloc_root, my_free, my_realloc */
#include "m_string.h"                           /* TRASH */
#include "sql_list.h"

class String;
#ifdef MYSQL_SERVER
extern PSI_memory_key key_memory_String_value;
#define STRING_PSI_MEMORY_KEY key_memory_String_value
#else
#define STRING_PSI_MEMORY_KEY PSI_NOT_INSTRUMENTED
#endif

typedef struct st_io_cache IO_CACHE;
typedef struct st_mem_root MEM_ROOT;
#define ASSERT_LENGTH(A) DBUG_ASSERT(str_length + (uint32) (A) <= Alloced_length)

#include "pack.h"
class Binary_string;
int sortcmp(const Binary_string *s, const Binary_string *t, CHARSET_INFO *cs);
int stringcmp(const Binary_string *s, const Binary_string *t);
String *copy_if_not_alloced(String *a,String *b,uint32 arg_length);
inline uint32 copy_and_convert(char *to, size_t to_length, CHARSET_INFO *to_cs,
                               const char *from, size_t from_length,
                               CHARSET_INFO *from_cs, uint *errors)
{
  return my_convert(to, (uint)to_length, to_cs, from, (uint)from_length,
                    from_cs, errors);
}

class String_copy_status: protected MY_STRCOPY_STATUS
{
public:
  const char *source_end_pos() const
  { return m_source_end_pos; }
  const char *well_formed_error_pos() const
  { return m_well_formed_error_pos; }
};

class Well_formed_prefix_status: public String_copy_status
{
public:
  Well_formed_prefix_status(CHARSET_INFO *cs,
                            const char *str, const char *end, size_t nchars)
  { cs->well_formed_char_length(str, end, nchars, this); }
};

class Well_formed_prefix: public Well_formed_prefix_status
{
  const char *m_str; // The beginning of the string
public:
  Well_formed_prefix(CHARSET_INFO *cs, const char *str, const char *end,
                     size_t nchars)
   :Well_formed_prefix_status(cs, str, end, nchars), m_str(str)
  { }
  Well_formed_prefix(CHARSET_INFO *cs, const char *str, size_t length,
                     size_t nchars)
   :Well_formed_prefix_status(cs, str, str + length, nchars), m_str(str)
  { }
  Well_formed_prefix(CHARSET_INFO *cs, const char *str, size_t length)
   :Well_formed_prefix_status(cs, str, str + length, length), m_str(str)
  { }
  Well_formed_prefix(CHARSET_INFO *cs, LEX_CSTRING str, size_t nchars)
   :Well_formed_prefix_status(cs, str.str, str.str + str.length, nchars),
    m_str(str.str)
  { }
  size_t length() const { return m_source_end_pos - m_str; }
};

class String_copier: public String_copy_status,
                     protected MY_STRCONV_STATUS
{
public:
  const char *cannot_convert_error_pos() const
  { return m_cannot_convert_error_pos; }
  const char *most_important_error_pos() const
  {
    return well_formed_error_pos() ? well_formed_error_pos() :
                                     cannot_convert_error_pos();
  }
  /*
    Convert a string between character sets.
    "dstcs" and "srccs" cannot be &my_charset_bin.
  */
  size_t convert_fix(CHARSET_INFO *dstcs, char *dst, size_t dst_length,
                     CHARSET_INFO *srccs, const char *src, size_t src_length,
                     size_t nchars)
  {
    return my_convert_fix(dstcs, dst, dst_length,
                          srccs, src, src_length, nchars, this, this);
  }
  /*
     Copy a string. Fix bad bytes/characters to '?'.
  */
  uint well_formed_copy(CHARSET_INFO *to_cs, char *to, size_t to_length,
                        CHARSET_INFO *from_cs, const char *from,
                        size_t from_length, size_t nchars);
  // Same as above, but without the "nchars" limit.
  uint well_formed_copy(CHARSET_INFO *to_cs, char *to, size_t to_length,
                        CHARSET_INFO *from_cs, const char *from,
                        size_t from_length)
  {
    return well_formed_copy(to_cs, to, to_length,
                            from_cs, from, from_length,
                            from_length /* No limit on "nchars"*/);
  }
};

size_t my_copy_with_hex_escaping(CHARSET_INFO *cs,
                                 char *dst, size_t dstlen,
                                 const char *src, size_t srclen);
uint convert_to_printable(char *to, size_t to_len,
                          const char *from, size_t from_len,
                          CHARSET_INFO *from_cs, size_t nbytes= 0);
size_t convert_to_printable_required_length(uint len);

class Charset
{
  CHARSET_INFO *m_charset;
public:
  Charset() :m_charset(&my_charset_bin) { }
  Charset(CHARSET_INFO *cs) :m_charset(cs) { }

CHARSET_INFO *charset() const { return m_charset; }
  bool use_mb() const { return m_charset->use_mb(); }
  uint mbminlen() const { return m_charset->mbminlen; }
  uint mbmaxlen() const { return m_charset->mbmaxlen; }
  bool is_good_for_ft() const
  {
    // Binary and UCS2/UTF16/UTF32 are not supported
    return m_charset != &my_charset_bin && m_charset->mbminlen == 1;
  }

size_t numchars(const char *str, const char *end) const
  {
    return m_charset->numchars(str, end);
  }
  size_t lengthsp(const char *str, size_t length) const
  {
    return m_charset->lengthsp(str, length);
  }
  size_t charpos(const char *str, const char *end, size_t pos) const
  {
    return m_charset->charpos(str, end, pos);
  }
  void set_charset(CHARSET_INFO *charset_arg)
  {
    m_charset= charset_arg;
  }
  void set_charset(const Charset &other)
  {
    m_charset= other.m_charset;
  }
  void swap(Charset &other)
  {
    swap_variables(CHARSET_INFO*, m_charset, other.m_charset);
  }
  bool same_encoding(const Charset &other) const
  {
    return my_charset_same(m_charset, other.m_charset);
  }
  /*
    Collation name without the character set name.
    For example, in case of "latin1_swedish_ci",
    this method returns "_swedish_ci".
  */
  LEX_CSTRING collation_specific_name() const;
  bool encoding_allows_reinterpret_as(CHARSET_INFO *cs) const;
  bool eq_collation_specific_names(CHARSET_INFO *cs) const;
  bool can_have_collate_clause() const
  {
    return m_charset != &my_charset_bin;
  }

/*
    The MariaDB version when the last collation change happened,
    e.g. due to a bug fix. See functions below.
  */
  static ulong latest_mariadb_version_with_collation_change()
  {
    return 110002;
  }

/*
    Check if the collation with the given ID changed its order
    since the given MariaDB version.
  */
  static bool collation_changed_order(ulong mysql_version, uint cs_number)
  {
    if ((mysql_version < 50048 &&
           (cs_number == 11 || /* ascii_general_ci - bug #29499, bug #27562 */
            cs_number == 41 || /* latin7_general_ci - bug #29461 */
            cs_number == 42 || /* latin7_general_cs - bug #29461 */
            cs_number == 20 || /* latin7_estonian_cs - bug #29461 */
            cs_number == 21 || /* latin2_hungarian_ci - bug #29461 */
            cs_number == 22 || /* koi8u_general_ci - bug #29461 */
            cs_number == 23 || /* cp1251_ukrainian_ci - bug #29461 */
            cs_number == 26)) || /* cp1250_general_ci - bug #29461 */
           (mysql_version < 50124 &&
           (cs_number == 33 || /* utf8mb3_general_ci - bug #27877 */
            cs_number == 35))) /* ucs2_general_ci - bug #27877 */
        return true;

if (cs_number == 159 && /* ucs2_general_mysql500_ci - MDEV-30746 */
        ((mysql_version >= 100400 && mysql_version < 100429) ||
         (mysql_version >= 100500 && mysql_version < 100520) ||
         (mysql_version >= 100600 && mysql_version < 100613) ||
         (mysql_version >= 100700 && mysql_version < 100708) ||
         (mysql_version >= 100800 && mysql_version < 100808) ||
         (mysql_version >= 100900 && mysql_version < 100906) ||
         (mysql_version >= 101000 && mysql_version < 101004) ||
         (mysql_version >= 101100 && mysql_version < 101103) ||
         (mysql_version >= 110000 && mysql_version < 110002)))
      return true;
    return false;
  }

/**
     Check if a collation has changed ID since the given version.
     Return the new ID.

@param mysql_version
     @param cs_number     - collation ID

@retval the new collation ID (or cs_number, if no change)
  */

static uint upgrade_collation_id(ulong mysql_version, uint cs_number)
  {
    if (mysql_version >= 50300 && mysql_version <= 50399)
    {
      switch (cs_number) {
      case 149: return MY_PAGE2_COLLATION_ID_UCS2;   // ucs2_crotian_ci
      case 213: return MY_PAGE2_COLLATION_ID_UTF8;   // utf8_crotian_ci
      }
    }
    if ((mysql_version >= 50500 && mysql_version <= 50599) ||
        (mysql_version >= 100000 && mysql_version <= 100005))
    {
      switch (cs_number) {
      case 149: return MY_PAGE2_COLLATION_ID_UCS2;   // ucs2_crotian_ci
      case 213: return MY_PAGE2_COLLATION_ID_UTF8;   // utf8_crotian_ci
      case 214: return MY_PAGE2_COLLATION_ID_UTF32;  // utf32_croatian_ci
      case 215: return MY_PAGE2_COLLATION_ID_UTF16;  // utf16_croatian_ci
      case 245: return MY_PAGE2_COLLATION_ID_UTF8MB4;// utf8mb4_croatian_ci
      }
    }
    return cs_number;
  }

};

/**
   Storage for strings with both length and allocated length.
   Automatically grows on demand.
*/

class Binary_string: public Sql_alloc
{
protected:
  char *Ptr;
  uint32 str_length, Alloced_length, extra_alloc;
  bool alloced, thread_specific;
  void init_private_data()
  {
    Ptr= 0;
    Alloced_length= extra_alloc= str_length= 0;
    alloced= thread_specific= false;
  }
  inline void free_buffer()
  {
    if (alloced)
    {
      alloced=0;
      my_free(Ptr);
    }
  }
public:
  Binary_string()
  {
    init_private_data();
  }
  explicit Binary_string(size_t length_arg)
  {
    init_private_data();
    (void) real_alloc(length_arg);
  }
  /*
    NOTE: If one intend to use the c_ptr() method, the following two
    contructors need the size of memory for STR to be at least LEN+1 (to make
    room for zero termination).
  */
  Binary_string(const char *str, size_t len)
  {
    Ptr= (char*) str;
    str_length= (uint32) len;
    Alloced_length= 0;                          /* Memory cannot be written to */
    extra_alloc= 0;
    alloced= thread_specific= 0;
  }
  Binary_string(char *str, size_t len)
  {
    Ptr= str;
    str_length= Alloced_length= (uint32) len;
    extra_alloc= 0;
    alloced= thread_specific= 0;
  }
  explicit Binary_string(const Binary_string &str)
  {
    Ptr= str.Ptr;
    str_length= str.str_length;
    Alloced_length= str.Alloced_length;
    extra_alloc= 0;
    alloced= thread_specific= 0;
  }

~Binary_string()
  {
    free();
  }

inline uint32 length() const { return str_length;}
  inline char& operator [] (size_t i) const { return Ptr[i]; }
  inline void length(size_t len) { str_length=(uint32)len ; }
  inline bool is_empty() const { return (str_length == 0); }
  inline const char *ptr() const { return Ptr; }
  inline const char *end() const { return Ptr + str_length; }
  bool has_8bit_bytes() const
  {
    for (const char *c= ptr(), *c_end= end(); c < c_end; c++)
    {
      if (!my_isascii(*c))
        return true;
    }
    return false;
  }

bool bin_eq(const Binary_string *other) const
  {
    return length() == other->length() &&
           !memcmp(ptr(), other->ptr(), length());
  }

// Returns offset to substring or -1
  int strstr(const Binary_string &search, uint32 offset=0) const;
  int strstr(const char *search, uint32 search_length, uint32 offset=0) const;
  // Returns offset to substring or -1
  int strrstr(const Binary_string &search, uint32 offset=0) const;

/*
    The following append operations do not extend the strings and in production
    mode do NOT check that alloced memory!
    q_*** methods writes values of parameters itself
    qs_*** methods writes string representation of value
  */
  void q_append(const char c)
  {
    ASSERT_LENGTH(1);
    Ptr[str_length++] = c;
  }
  void q_append2b(const uint32 n)
  {
    ASSERT_LENGTH(2);
    int2store(Ptr + str_length, n);
    str_length += 2;
  }
  void q_append(const uint32 n)
  {
    ASSERT_LENGTH(4);
    int4store(Ptr + str_length, n);
    str_length += 4;
  }
  void q_append(double d)
  {
    ASSERT_LENGTH(8);
    float8store(Ptr + str_length, d);
    str_length += 8;
  }
  void q_append(double *d)
  {
    ASSERT_LENGTH(8);
    float8store(Ptr + str_length, *d);
    str_length += 8;
  }
  /*
    Append a wide character.
    The caller must have allocated at least cs->mbmaxlen bytes.
  */
  int q_append_wc(my_wc_t wc, CHARSET_INFO *cs)
  {
    int mblen;
    if ((mblen= cs->cset->wc_mb(cs, wc,
                                (uchar *) end(),
                                (uchar *) end() + cs->mbmaxlen)) > 0)
      str_length+= (uint32) mblen;
    return mblen;
  }
  void q_append(const char *data, size_t data_len)
  {
    ASSERT_LENGTH(data_len);
    if (data_len)
      memcpy(Ptr + str_length, data, data_len);
    DBUG_ASSERT(str_length <= UINT_MAX32 - data_len);
    str_length += (uint)data_len;
  }
  void q_append(const LEX_CSTRING *ls)
  {
    DBUG_ASSERT(ls->length < UINT_MAX32 &&
                ((ls->length == 0 && !ls->str) ||
                 ls->length == strlen(ls->str)));
    q_append(ls->str, (uint32) ls->length);
  }

void write_at_position(uint32 position, uint32 value)
  {
    DBUG_ASSERT(str_length >= position + 4);
    int4store(Ptr + position,value);
  }

void qs_append(const LEX_CSTRING *ls)
  {
    DBUG_ASSERT(ls->length < UINT_MAX32 &&
                ((ls->length == 0 && !ls->str) ||
                 ls->length == strlen(ls->str)));
    qs_append(ls->str, (uint32)ls->length);
  }
  void qs_append(const char *str, size_t len);
  void qs_append_hex(const char *str, uint32 len);
  void qs_append_hex_uint32(uint32 num);
  void qs_append(double d);
  void qs_append(const double *d);
  inline void qs_append(const char c)
  {
    ASSERT_LENGTH(1);
    Ptr[str_length]= c;
    str_length++;
  }
  void qs_append(int i);
  void qs_append(uint i)
  {
    qs_append((ulonglong)i);
  }
  void qs_append(ulong i)
  {
    qs_append((ulonglong)i);
  }
  void qs_append(ulonglong i);
  void qs_append(longlong i, int radix)
  {
    ASSERT_LENGTH(22);
    char *buff= Ptr + str_length;
    char *end= ll2str(i, buff, radix, 0);
    str_length+= (uint32) (end-buff);
  }

/* Mark variable thread specific it it's not allocated already */
  inline void set_thread_specific()
  {
    if (!alloced)
      thread_specific= 1;
  }
  bool is_alloced() const { return alloced; }
  inline uint32 alloced_length() const { return Alloced_length;}
  inline uint32 extra_allocation() const { return extra_alloc;}
  inline void extra_allocation(size_t len) { extra_alloc= (uint32)len; }
  inline void mark_as_const() { Alloced_length= 0;}

inline bool uses_buffer_owned_by(const Binary_string *s) const
  {
    return (s->alloced && Ptr >= s->Ptr && Ptr < s->Ptr + s->Alloced_length);
  }

/* Swap two string objects. Efficient way to exchange data without memcpy. */
  void swap(Binary_string &s)
  {
    swap_variables(char *, Ptr, s.Ptr);
    swap_variables(uint32, str_length, s.str_length);
    swap_variables(uint32, Alloced_length, s.Alloced_length);
    swap_variables(bool, alloced, s.alloced);
  }

/**
     Points the internal buffer to the supplied one. The old buffer is freed.
     @param str Pointer to the new buffer.
     @param arg_length Length of the new buffer in characters, excluding any
            null character.
     @note The new buffer will not be null terminated.
  */
  void set_alloced(char *str, size_t length, size_t alloced_length)
  {
    free_buffer();
    Ptr= str;
    str_length= (uint32) length;
    DBUG_ASSERT(alloced_length < UINT_MAX32);
    Alloced_length= (uint32) alloced_length;
  }
  inline void set(char *str, size_t arg_length)
  {
    set_alloced(str, arg_length, arg_length);
  }
  inline void set(const char *str, size_t length)
  {
    free_buffer();
    Ptr= (char*) str;
    str_length= (uint32) length;
    Alloced_length= 0;
  }

void set(Binary_string &str, size_t offset, size_t length)
  {
    DBUG_ASSERT(&str != this);
    free_buffer();
    Ptr= str.Ptr + offset;
    str_length= (uint32) length;
    Alloced_length= 0;
    if (str.Alloced_length)
      Alloced_length= (uint32) (str.Alloced_length - offset);
  }
  LEX_CSTRING to_lex_cstring() const
  {
    LEX_CSTRING tmp= {Ptr, str_length};
    return tmp;
  }
  inline LEX_CSTRING *get_value(LEX_CSTRING *res) const
  {
    res->str=    Ptr;
    res->length= str_length;
    return res;
  }

/* Take over handling of buffer from some other object */
  void reset(char *ptr_arg, size_t length_arg, size_t alloced_length_arg)
  {
    set_alloced(ptr_arg, length_arg, alloced_length_arg);
    alloced= ptr_arg != 0;
  }

/* Forget about the buffer, let some other object handle it */
  char *release()
  {
    char *old= Ptr;
    init_private_data();
    return old;
  }

/*
    This is used to set a new buffer for String.
    However if the String already has an allocated buffer, it will
    keep that one.
    It's not to be used to set the value or length of the string.
  */
  inline void set_buffer_if_not_allocated(char *str, size_t arg_length)
  {
    if (!alloced)
    {
      /*
        Following should really set str_length= 0, but some code may
        depend on that the String length is same as buffer length.
      */
      Ptr= str;
      str_length= Alloced_length= (uint32) arg_length;
    }
    /* One should set str_length before using it */
    MEM_UNDEFINED(&str_length, sizeof(str_length));
  }

inline Binary_string& operator=(const Binary_string &s)
  {
    if (&s != this)
    {
      /*
        It is forbidden to do assignments like
        some_string = substring_of_that_string
      */
      DBUG_ASSERT(!s.uses_buffer_owned_by(this));
      set_alloced((char *) s.Ptr, s.str_length, s.Alloced_length);
    }
    return *this;
  }

bool set_hex(ulonglong num);
  bool set_hex(const char *str, uint32 len);
  bool set_fcvt(double num, uint decimals);

bool copy();                                  // Alloc string if not alloced
  bool copy(const Binary_string &s);            // Allocate new string
  bool copy(const char *s, size_t arg_length);	// Allocate new string
  bool copy_or_move(const char *s,size_t arg_length);

/**
    Convert a string to a printable format.
    All non-convertable and control characters are replaced to 5-character
    sequences '\hhhh'.
  */
  bool copy_printable_hhhh(CHARSET_INFO *to_cs,
                           CHARSET_INFO *from_cs,
                           const char *from, size_t from_length);

bool append_ulonglong(ulonglong val);
  bool append_longlong(longlong val);

bool append(const char *s, size_t size)
  {
    if (!size)
      return false;
    if (realloc_with_extra_if_needed(str_length + size))
      return true;
    q_append(s, size);
    return false;
  }
  bool append(const LEX_CSTRING &s)
  {
    return append(s.str, s.length);
  }
  bool append(const Binary_string &s)
  {
    return append(s.ptr(), s.length());
  }
  bool append(IO_CACHE* file, uint32 arg_length);

inline bool append_char(char chr)
  {
    if (str_length < Alloced_length)
    {
      Ptr[str_length++]= chr;
    }
    else
    {
      if (unlikely(realloc_with_extra(str_length + 1)))
	return true;
      Ptr[str_length++]= chr;
    }
    return false;
  }
  bool append_hex(const char *src, uint32 srclen)
  {
    for (const char *src_end= src + srclen ; src != src_end ; src++)
    {
      if (unlikely(append_char(_dig_vec_lower[((uchar) *src) >> 4])) ||
          unlikely(append_char(_dig_vec_lower[((uchar) *src) & 0x0F])))
        return true;
    }
    return false;
  }
  bool append_hex_uint32(uint32 num)
  {
    if (reserve(8))
      return true;
    qs_append_hex_uint32(num);
    return false;
  }
  bool append_with_step(const char *s, uint32 arg_length, uint32 step_alloc)
  {
    uint32 new_length= arg_length + str_length;
    if (new_length > Alloced_length &&
        unlikely(realloc(new_length + step_alloc)))
      return true;
    q_append(s, arg_length);
    return false;
  }

inline char *c_ptr()
  {
    if (unlikely(!Ptr))
      return (char*) "";
    /*
      Here we assume that any buffer used to initalize String has
      an end \0 or have at least an accessable character at end.
      This is to handle the case of String("Hello",5) and
      String("hello",5) efficiently.

We have two options here. To test for !Alloced_length or !alloced.
      Using "Alloced_length" is slightly safer so that we do not read
      from potentially unintialized memory (normally not dangerous but
      may give warnings in valgrind), but "alloced" is safer as there
      are less change to get memory loss from code that is using
      String((char*), length) or String.set((char*), length) and does
      not free things properly (and there is several places in the code
      where this happens and it is hard to find out if any of these will call
      c_ptr().
    */
    if (unlikely(!alloced && !Ptr[str_length]))
      return Ptr;
    if (str_length < Alloced_length)
    {
      Ptr[str_length]=0;
      return Ptr;
    }
    (void) realloc(str_length);               /* This will add end \0 */
    return Ptr;
  }
  /*
    One should use c_ptr() instead for most cases. This will be deleted soon,
    kept for compatiblity.
  */
  inline char *c_ptr_quick()
  {
    return c_ptr_safe();
  }
  /*
    This is to be used only in the case when one cannot use c_ptr().
    The cases are:
    - When one initializes String with an external buffer and length and
      buffer[length] could be uninitalized when c_ptr() is called.
    - When valgrind gives warnings about uninitialized memory with c_ptr().
  */
  inline char *c_ptr_safe()
  {
    if (Ptr && str_length < Alloced_length)
      Ptr[str_length]=0;
    else
      (void) realloc(str_length);
    return Ptr;
  }

inline void free()
  {
    free_buffer();
    /*
      We have to clear the values as some Strings, like in Field, are
      reused after free(). Because of this we cannot use MEM_UNDEFINED() here.
    */
    Ptr= 0;
    str_length= 0;
    Alloced_length= extra_alloc= 0;
  }

inline bool alloc(size_t arg_length)
  {
    /*
      Allocate if we need more space or if we don't have done any
      allocation yet (we don't want to have Ptr to be NULL for empty strings).

Note that if arg_length == Alloced_length then we don't allocate.
      This ensures we don't do any extra allocations in protocol and String:int,
      but the string will not be automatically null terminated if c_ptr() is not
      called.
    */
    if (arg_length <= Alloced_length && Alloced_length)
      return 0;
    return real_alloc(arg_length);
  }
  bool real_alloc(size_t arg_length);  // Empties old string
  bool realloc_raw(size_t arg_length);
  bool realloc(size_t arg_length)
  {
    if (realloc_raw(arg_length+1))
      return TRUE;
    Ptr[arg_length]= 0; // This make other funcs shorter
    return FALSE;
  }
  bool realloc_with_extra(size_t arg_length)
  {
    if (extra_alloc < 4096)
      extra_alloc= extra_alloc*2+128;
    if (realloc_raw(arg_length + extra_alloc))
      return TRUE;
    Ptr[arg_length]=0;        // This make other funcs shorter
    return FALSE;
  }
  bool realloc_with_extra_if_needed(size_t arg_length)
  {
    if (arg_length < Alloced_length)
    {
      Ptr[arg_length]=0; // behave as if realloc was called.
      return 0;
    }
    return realloc_with_extra(arg_length);
  }
  // Shrink the buffer, but only if it is allocated on the heap.
  void shrink(size_t arg_length);

void move(Binary_string &s)
  {
    set_alloced(s.Ptr, s.str_length, s.Alloced_length);
    extra_alloc= s.extra_alloc;
    alloced= s.alloced;
    thread_specific= s.thread_specific;
    s.alloced= 0;
  }
  bool fill(size_t max_length,char fill);
  /*
    Replace substring with string
    If wrong parameter or not enough memory, do nothing
  */
  bool replace(uint32 offset,uint32 arg_length, const char *to, uint32 length);
  bool replace(uint32 offset,uint32 arg_length, const Binary_string &to)
  {
    return replace(offset,arg_length,to.ptr(),to.length());
  }

int reserve(size_t space_needed)
  {
    DBUG_ASSERT((ulonglong) str_length + space_needed < UINT_MAX32);
    return realloc(str_length + space_needed);
  }
  int reserve(size_t space_needed, size_t grow_by);

inline char *prep_append(uint32 arg_length, uint32 step_alloc)
  {
    uint32 new_length= arg_length + str_length;
    if (new_length > Alloced_length)
    {
      if (unlikely(realloc(new_length + step_alloc)))
        return 0;
    }
    uint32 old_length= str_length;
    str_length+= arg_length;
    return Ptr + old_length;                  // Area to use
  }

void q_net_store_length(ulonglong length)
  {
    DBUG_ASSERT(Alloced_length >= (str_length + net_length_size(length)));
    char *pos= (char *) net_store_length((uchar *)(Ptr + str_length), length);
    str_length= uint32(pos - Ptr);
  }
  void q_net_store_data(const uchar *from, size_t length)
  {
    DBUG_ASSERT(length < UINT_MAX32);
    DBUG_ASSERT(Alloced_length >= (str_length + length +
                                   net_length_size(length)));
    q_net_store_length(length);
    q_append((const char *)from, (uint32) length);
  }
};

class String: public Charset, public Binary_string
{
public:
  String() = default;
  String(size_t length_arg) :Binary_string(length_arg)
  { }
  /*
    NOTE: If one intend to use the c_ptr() method, the following two
    contructors need the size of memory for STR to be at least LEN+1 (to make
    room for zero termination).
  */
  String(const char *str, size_t len, CHARSET_INFO *cs)
   :Charset(cs), Binary_string(str, len)
  { }
  String(char *str, size_t len, CHARSET_INFO *cs)
   :Charset(cs), Binary_string(str, len)
  { }
  String(const String &str) = default;
  String(String &&str) noexcept
   :Charset(std::move(str)), Binary_string(std::move(str)){}

void set(String &str,size_t offset,size_t arg_length)
  {
    Binary_string::set(str, offset, arg_length);
    set_charset(str);
  }
  inline void set(char *str,size_t arg_length, CHARSET_INFO *cs)
  {
    Binary_string::set(str, arg_length);
    set_charset(cs);
  }
  inline void set(const char *str,size_t arg_length, CHARSET_INFO *cs)
  {
    Binary_string::set(str, arg_length);
    set_charset(cs);
  }
  bool set_ascii(const char *str, size_t arg_length);
  inline void set_buffer_if_not_allocated(char *str,size_t arg_length,
                                          CHARSET_INFO *cs)
  {
    Binary_string::set_buffer_if_not_allocated(str, arg_length);
    set_charset(cs);
  }
  bool set_int(longlong num, bool unsigned_flag, CHARSET_INFO *cs);
  bool set(int num, CHARSET_INFO *cs) { return set_int(num, false, cs); }
  bool set(uint num, CHARSET_INFO *cs) { return set_int(num, true, cs); }
  bool set(long num, CHARSET_INFO *cs) { return set_int(num, false, cs); }
  bool set(ulong num, CHARSET_INFO *cs) { return set_int(num, true, cs); }
  bool set(longlong num, CHARSET_INFO *cs) { return set_int(num, false, cs); }
  bool set(ulonglong num, CHARSET_INFO *cs) { return set_int((longlong)num, true, cs); }
  bool set_real(double num,uint decimals, CHARSET_INFO *cs);
  bool set_fcvt(double num, uint decimals)
  {
    set_charset(&my_charset_latin1);
    return Binary_string::set_fcvt(num, decimals);
  }

bool set_hex(ulonglong num)
  {
    set_charset(&my_charset_latin1);
    return Binary_string::set_hex(num);
  }
  bool set_hex(const char *str, uint32 len)
  {
    set_charset(&my_charset_latin1);
    return Binary_string::set_hex(str, len);
  }

/* Take over handling of buffer from some other object */
  void reset(char *ptr_arg, size_t length_arg, size_t alloced_length_arg,
             CHARSET_INFO *cs)
  {
    Binary_string::reset(ptr_arg, length_arg, alloced_length_arg);
    set_charset(cs);
  }

inline String& operator = (const String &s)
  {
    if (&s != this)
    {
      set_charset(s);
      Binary_string::operator=(s);
    }
    return *this;
  }

bool copy()
  {
    return Binary_string::copy();
  }
  bool copy(const String &s)
  {
    set_charset(s);
    return Binary_string::copy(s);
  }
  bool copy(const char *s, size_t arg_length, CHARSET_INFO *cs)
  {
    set_charset(cs);
    return Binary_string::copy(s, arg_length);
  }
  bool copy_or_move(const char *s, size_t arg_length, CHARSET_INFO *cs)
  {
    set_charset(cs);
    return Binary_string::copy_or_move(s, arg_length);
  }
  static bool needs_conversion(size_t arg_length,
  			       CHARSET_INFO *cs_from, CHARSET_INFO *cs_to,
			       uint32 *offset);
  static bool needs_conversion_on_storage(size_t arg_length,
                                          CHARSET_INFO *cs_from,
                                          CHARSET_INFO *cs_to);
  bool copy_aligned(const char *s, size_t arg_length, size_t offset,
		    CHARSET_INFO *cs);
  bool set_or_copy_aligned(const char *s, size_t arg_length, CHARSET_INFO *cs);
  bool can_be_safely_converted_to(CHARSET_INFO *tocs) const
  {
    if (charset() == &my_charset_bin)
      return Well_formed_prefix(tocs, ptr(), length()).length() == length();
    String try_val;
    uint try_conv_error= 0;
    try_val.copy(ptr(), length(), charset(), tocs, &try_conv_error);
    return try_conv_error == 0;
  }
  bool copy(const char*s, size_t arg_length, CHARSET_INFO *csfrom,
	    CHARSET_INFO *csto, uint *errors);
  bool copy(const String *str, CHARSET_INFO *tocs, uint *errors)
  {
    return copy(str->ptr(), str->length(), str->charset(), tocs, errors);
  }
  bool copy(CHARSET_INFO *tocs,
            CHARSET_INFO *fromcs, const char *src, size_t src_length,
            size_t nchars, String_copier *copier)
  {
    if (unlikely(alloc(tocs->mbmaxlen * src_length)))
      return true;
    str_length= copier->well_formed_copy(tocs, Ptr, alloced_length(),
                                         fromcs, src, (uint) src_length,
                                         (uint) nchars);
    set_charset(tocs);
    return false;
  }
  // Append without character set conversion
  bool append(const String &s)
  {
    return Binary_string::append(s);
  }
  inline bool append(char chr)
  {
    return append(&chr, 1);
  }
  bool append_hex(const char *src, uint32 srclen)
  {
    return Binary_string::append_hex(src, srclen);
  }
  bool append_hex(const uchar *src, uint32 srclen)
  {
    return Binary_string::append_hex((const char*)src, srclen);
  }
  bool append_introducer_and_hex(const String *str)
  {
    return
      append('_')   ||
      append(str->charset()->cs_name) ||
      append(STRING_WITH_LEN(" 0x")) ||
      append_hex(str->ptr(), (uint32) str->length());
  }
  bool append(IO_CACHE* file, uint32 arg_length)
  {
    return Binary_string::append(file, arg_length);
  }
  inline bool append(const char *s, uint32 arg_length, uint32 step_alloc)
  {
    return append_with_step(s, arg_length, step_alloc);
  }

// Append with optional character set conversion from ASCII (e.g. to UCS2)
  bool append(const LEX_STRING *ls)
  {
    DBUG_ASSERT(ls->length < UINT_MAX32 &&
                ((ls->length == 0 && !ls->str) ||
                 ls->length == strlen(ls->str)));
    return append(ls->str, (uint32) ls->length);
  }
  bool append(const LEX_CSTRING *ls)
  {
    DBUG_ASSERT(ls->length < UINT_MAX32 &&
                ((ls->length == 0 && !ls->str) ||
                 ls->length == strlen(ls->str)));
    return append(ls->str, (uint32) ls->length);
  }
  bool append(const LEX_CSTRING &ls)
  {
    return append(&ls);
  }
  bool append_name_value(const LEX_CSTRING &name,
                         const LEX_CSTRING &value,
                         uchar quot= '\0')
  {
    return
      append(name) ||
      append('=') ||
      (quot && append(quot)) ||
      append(value) ||
      (quot && append(quot));
  }
  bool append(const char *s, size_t size);
  bool append_parenthesized(long nr, int radix= 10);

// Append with optional character set conversion from cs to charset()
  bool append(const char *s, size_t arg_length, CHARSET_INFO *cs);
  bool append(const LEX_CSTRING &s, CHARSET_INFO *cs)
  {
    return append(s.str, s.length, cs);
  }

// Append a wide character
  bool append_wc(my_wc_t wc)
  {
    if (reserve(mbmaxlen()))
      return true;
    int mblen= q_append_wc(wc, charset());
    if (mblen > 0)
      return false;
    else if (mblen == MY_CS_ILUNI && wc != '?')
      return q_append_wc('?', charset()) <= 0;
    return true;
  }

// Append a number with zero prefilling
  bool append_zerofill(uint num, uint width)
  {
    static const char zeros[15]= "00000000000000";
    char intbuff[15];
    uint length= (uint) (int10_to_str(num, intbuff, 10) - intbuff);
    if (length < width &&
        append(zeros, width - length, &my_charset_latin1))
      return true;
    return append(intbuff, length, &my_charset_latin1);
  }

/*
    Append a bitmask in an uint32 with a translation into a
    C-style human readable representation, e.g.:
      0x05 -> "(flag04|flag01)"

@param flags  - the flags to translate
    @param names  - an array of flag names
    @param count  - the number of available elements in "names"
  */
  bool append_flag32_names(uint32 flags, LEX_CSTRING names[], size_t count)
  {
    bool added= false;
    if (flags && append('('))
      return true;
    for (ulong i= 0; i <= 31; i++)
    {
      ulong bit= 31 - i;
      if (flags & (1 << bit))
      {
        if (added && append('|'))
          return true;
        if (bit < count ? append(names[bit]) : append('?'))
          return true;
        added= true;
      }
    }
    if (flags && append(')'))
      return true;
    return false;
  }

inline void chop()
  {
    if (str_length)
    {
      str_length--;
      str_length= well_formed_length();
    }
  }

void strip_sp();
  friend String *copy_if_not_alloced(String *a,String *b,uint32 arg_length);
  friend class Field;
  uint32 numchars() const
  {
    return (uint32) Charset::numchars(ptr(), end());
  }
  int charpos(longlong i, uint32 offset=0)
  {
    if (i <= 0)
      return (int) i;
    return (int) Charset::charpos(ptr() + offset, end(), (size_t) i);
  }
  size_t lengthsp() const
  {
    return Charset::lengthsp(Ptr, str_length);
  }

void print(String *to) const;
  void print_with_conversion(String *to, CHARSET_INFO *cs) const;
  void print(String *to, CHARSET_INFO *cs) const
  {
    if (my_charset_same(charset(), cs))
      print(to);
    else
      print_with_conversion(to, cs);
  }

static my_wc_t escaped_wc_for_single_quote(my_wc_t ch)
  {
    switch (ch)
    {
    case '\\':   return '\\';
    case '\0':   return '0';
    case '\'':   return '\'';
    case '\n':   return 'n';
    case '\r':   return 'r';
    case '\032': return 'Z';
    }
    return 0;
  }

// Append for single quote using mb_wc/wc_mb Unicode conversion
  bool append_for_single_quote_using_mb_wc(const char *str, size_t length,
                                           CHARSET_INFO *cs);

// Append for single quote with optional mb_wc/wc_mb conversion
  bool append_for_single_quote_opt_convert(const char *str,
                                           size_t length,
                                           CHARSET_INFO *cs)
  {
    return charset() == &my_charset_bin || cs == &my_charset_bin  ||
           my_charset_same(charset(), cs) ?
           append_for_single_quote(str, length) :
           append_for_single_quote_using_mb_wc(str, length, cs);
  }

bool append_for_single_quote_opt_convert(const String &str)
  {
    return append_for_single_quote_opt_convert(str.ptr(),
                                               str.length(),
                                               str.charset());
  }

bool append_for_single_quote(const char *st, size_t len);
  bool append_for_single_quote(const String *s)
  {
    return append_for_single_quote(s->ptr(), s->length());
  }

void swap(String &s)
  {
    Charset::swap(s);
    Binary_string::swap(s);
  }

uint well_formed_length() const
  {
    return (uint) Well_formed_prefix(charset(), ptr(), length()).length();
  }
  bool is_ascii() const
  {
    if (length() == 0)
      return TRUE;
    if (charset()->mbminlen > 1)
      return FALSE;
    return !has_8bit_bytes();
  }
  bool eq(const String *other, CHARSET_INFO *cs) const
  {
    return !sortcmp(this, other, cs);
  }
private:
  bool append_semi_hex(const char *s, uint len, CHARSET_INFO *cs);
};

// The following class is a backport from MySQL 5.6:
/**
  String class wrapper with a preallocated buffer of size buff_sz

This class allows to replace sequences of:
     char buff[12345];
     String str(buff, sizeof(buff));
     str.length(0);
  with a simple equivalent declaration:
     StringBuffer<12345> str;
*/

template<size_t buff_sz>
class StringBuffer : public String
{
  char buff[buff_sz];

public:
  StringBuffer() : String(buff, buff_sz, &my_charset_bin) { length(0); }
  explicit StringBuffer(CHARSET_INFO *cs) : String(buff, buff_sz, cs)
  {
    length(0);
  }
  void set_buffer_if_not_allocated(CHARSET_INFO *cs)
  {
    if (!is_alloced())
    {
      Ptr= buff;
      Alloced_length= (uint32) buff_sz;
    }
    str_length= 0;                          /* Safety, not required */
    /* One should set str_length before using it */
    MEM_UNDEFINED(&str_length, sizeof(str_length));
    set_charset(cs);
  }
};

template<size_t buff_sz>
class BinaryStringBuffer : public Binary_string
{
  char buff[buff_sz];
public:
  BinaryStringBuffer() : Binary_string(buff, buff_sz) { length(0); }
};

static inline bool check_if_only_end_space(CHARSET_INFO *cs,
                                           const char *str,
                                           const char *end)
{
  return str + cs->scan(str, end, MY_SEQ_SPACES) == end;
}

int append_query_string(CHARSET_INFO *csinfo, String *to,
                        const char *str, size_t len, bool no_backslash);

#endif /* SQL_STRING_INCLUDED */

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