Adding upstream version 1:10.5.12.upstream/1%10.5.12upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1506 insertions, 0 deletions

diff --git a/mysys/charset.c b/mysys/charset.c
new file mode 100644
index 00000000..32cfeb56
--- /dev/null
+++ b/mysys/charset.c
@@ -0,0 +1,1506 @@
+/*
+   Copyright (c) 2000, 2011, Oracle and/or its affiliates
+   Copyright (c) 2009, 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 */
+
+#include "mysys_priv.h"
+#include "mysys_err.h"
+#include <m_ctype.h>
+#include <m_string.h>
+#include <my_dir.h>
+#include <hash.h>
+#include <my_xml.h>
+#ifdef HAVE_LANGINFO_H
+#include <langinfo.h>
+#endif
+#ifdef HAVE_LOCALE_H
+#include <locale.h>
+#endif
+
+extern HASH charset_name_hash;
+
+/*
+  The code below implements this functionality:
+  
+    - Initializing charset related structures
+    - Loading dynamic charsets
+    - Searching for a proper CHARSET_INFO 
+      using charset name, collation name or collation ID
+    - Setting server default character set
+*/
+
+static uint
+get_collation_number_internal(const char *name)
+{
+
+  CHARSET_INFO **cs;
+  for (cs= all_charsets;
+       cs < all_charsets + array_elements(all_charsets);
+       cs++)
+  {
+    if ( cs[0] && cs[0]->name && 
+         !my_strcasecmp(&my_charset_latin1, cs[0]->name, name))
+      return cs[0]->number;
+  }  
+  return 0;
+}
+
+
+static my_bool is_multi_byte_ident(CHARSET_INFO *cs, uchar ch)
+{
+  int chlen= my_ci_charlen(cs, &ch, &ch + 1);
+  return MY_CS_IS_TOOSMALL(chlen) ? TRUE : FALSE;
+}
+
+static my_bool init_state_maps(struct charset_info_st *cs)
+{
+  uint i;
+  uchar *state_map;
+  uchar *ident_map;
+
+  if (!(cs->state_map= state_map= (uchar*) my_once_alloc(256*2, MYF(MY_WME))))
+    return 1;
+    
+  cs->ident_map= ident_map= state_map + 256;
+
+  /* Fill state_map with states to get a faster parser */
+  for (i=0; i < 256 ; i++)
+  {
+    if (my_isalpha(cs,i))
+      state_map[i]=(uchar) MY_LEX_IDENT;
+    else if (my_isdigit(cs,i))
+      state_map[i]=(uchar) MY_LEX_NUMBER_IDENT;
+    else if (is_multi_byte_ident(cs, i))
+      state_map[i]=(uchar) MY_LEX_IDENT;
+    else if (my_isspace(cs,i))
+      state_map[i]=(uchar) MY_LEX_SKIP;
+    else
+      state_map[i]=(uchar) MY_LEX_CHAR;
+  }
+  state_map[(uchar)'_']=state_map[(uchar)'$']=(uchar) MY_LEX_IDENT;
+  state_map[(uchar)'\'']=(uchar) MY_LEX_STRING;
+  state_map[(uchar)'.']=(uchar) MY_LEX_REAL_OR_POINT;
+  state_map[(uchar)'>']=state_map[(uchar)'=']=state_map[(uchar)'!']= (uchar) MY_LEX_CMP_OP;
+  state_map[(uchar)'<']= (uchar) MY_LEX_LONG_CMP_OP;
+  state_map[(uchar)'&']=state_map[(uchar)'|']=(uchar) MY_LEX_BOOL;
+  state_map[(uchar)'#']=(uchar) MY_LEX_COMMENT;
+  state_map[(uchar)';']=(uchar) MY_LEX_SEMICOLON;
+  state_map[(uchar)':']=(uchar) MY_LEX_SET_VAR;
+  state_map[0]=(uchar) MY_LEX_EOL;
+  state_map[(uchar)'\\']= (uchar) MY_LEX_ESCAPE;
+  state_map[(uchar)'/']= (uchar) MY_LEX_LONG_COMMENT;
+  state_map[(uchar)'*']= (uchar) MY_LEX_END_LONG_COMMENT;
+  state_map[(uchar)'@']= (uchar) MY_LEX_USER_END;
+  state_map[(uchar) '`']= (uchar) MY_LEX_USER_VARIABLE_DELIMITER;
+  state_map[(uchar)'"']= (uchar) MY_LEX_STRING_OR_DELIMITER;
+  state_map[(uchar)'-']= (uchar) MY_LEX_MINUS_OR_COMMENT;
+  state_map[(uchar)',']= (uchar) MY_LEX_COMMA;
+  state_map[(uchar)'?']= (uchar) MY_LEX_PLACEHOLDER;
+
+  /*
+    Create a second map to make it faster to find identifiers
+  */
+  for (i=0; i < 256 ; i++)
+  {
+    ident_map[i]= (uchar) (state_map[i] == MY_LEX_IDENT ||
+			   state_map[i] == MY_LEX_NUMBER_IDENT);
+  }
+
+  /* Special handling of hex and binary strings */
+  state_map[(uchar)'x']= state_map[(uchar)'X']= (uchar) MY_LEX_IDENT_OR_HEX;
+  state_map[(uchar)'b']= state_map[(uchar)'B']= (uchar) MY_LEX_IDENT_OR_BIN;
+  state_map[(uchar)'n']= state_map[(uchar)'N']= (uchar) MY_LEX_IDENT_OR_NCHAR;
+  return 0;
+}
+
+
+static MY_COLLATION_HANDLER *get_simple_collation_handler_by_flags(uint flags)
+{
+  return flags & MY_CS_BINSORT ?
+           (flags & MY_CS_NOPAD ?
+            &my_collation_8bit_nopad_bin_handler :
+            &my_collation_8bit_bin_handler) :
+           (flags & MY_CS_NOPAD ?
+            &my_collation_8bit_simple_nopad_ci_handler :
+            &my_collation_8bit_simple_ci_handler);
+}
+
+
+static void simple_cs_init_functions(struct charset_info_st *cs)
+{
+  cs->coll= get_simple_collation_handler_by_flags(cs->state);
+  cs->cset= &my_charset_8bit_handler;
+}
+
+
+
+static int cs_copy_data(struct charset_info_st *to, CHARSET_INFO *from)
+{
+  to->number= from->number ? from->number : to->number;
+
+  /* Don't replace csname if already set */
+  if (from->csname && !to->csname)
+    if (!(to->csname= my_once_strdup(from->csname,MYF(MY_WME))))
+      goto err;
+  
+  if (from->name)
+    if (!(to->name= my_once_strdup(from->name,MYF(MY_WME))))
+      goto err;
+  
+  if (from->comment)
+    if (!(to->comment= my_once_strdup(from->comment,MYF(MY_WME))))
+      goto err;
+  
+  if (from->m_ctype)
+  {
+    if (!(to->m_ctype= (uchar*) my_once_memdup((char*) from->m_ctype,
+                                               MY_CS_CTYPE_TABLE_SIZE,
+                                               MYF(MY_WME))))
+      goto err;
+    if (init_state_maps(to))
+      goto err;
+  }
+  if (from->to_lower)
+    if (!(to->to_lower= (uchar*) my_once_memdup((char*) from->to_lower,
+						MY_CS_TO_LOWER_TABLE_SIZE,
+						MYF(MY_WME))))
+      goto err;
+
+  if (from->to_upper)
+    if (!(to->to_upper= (uchar*) my_once_memdup((char*) from->to_upper,
+						MY_CS_TO_UPPER_TABLE_SIZE,
+						MYF(MY_WME))))
+      goto err;
+  if (from->sort_order)
+  {
+    if (!(to->sort_order= (uchar*) my_once_memdup((char*) from->sort_order,
+						  MY_CS_SORT_ORDER_TABLE_SIZE,
+						  MYF(MY_WME))))
+      goto err;
+
+  }
+  if (from->tab_to_uni)
+  {
+    uint sz= MY_CS_TO_UNI_TABLE_SIZE*sizeof(uint16);
+    if (!(to->tab_to_uni= (uint16*)  my_once_memdup((char*)from->tab_to_uni,
+						    sz, MYF(MY_WME))))
+      goto err;
+  }
+  if (from->tailoring)
+    if (!(to->tailoring= my_once_strdup(from->tailoring,MYF(MY_WME))))
+      goto err;
+
+  return 0;
+
+err:
+  return 1;
+}
+
+
+static my_bool simple_8bit_charset_data_is_full(CHARSET_INFO *cs)
+{
+  return cs->m_ctype && cs->to_upper && cs->to_lower && cs->tab_to_uni;
+}
+
+
+/**
+  Inherit missing 8bit charset data from another collation.
+  Arrays pointed by refcs must be in the permanent memory already,
+  e.g. static memory, or allocated by my_once_xxx().
+*/
+static void
+inherit_charset_data(struct charset_info_st *cs, CHARSET_INFO *refcs)
+{
+  if (!cs->to_upper)
+    cs->to_upper= refcs->to_upper;
+  if (!cs->to_lower)
+    cs->to_lower= refcs->to_lower;
+  if (!cs->m_ctype)
+    cs->m_ctype= refcs->m_ctype;
+  if (!cs->tab_to_uni)
+    cs->tab_to_uni= refcs->tab_to_uni;
+}
+
+
+static my_bool simple_8bit_collation_data_is_full(CHARSET_INFO *cs)
+{
+  return cs->sort_order || (cs->state & MY_CS_BINSORT);
+}
+
+
+/**
+  Inherit 8bit simple collation data from another collation.
+  refcs->sort_order must be in the permanent memory already,
+  e.g. static memory, or allocated by my_once_xxx().
+*/
+static void
+inherit_collation_data(struct charset_info_st *cs, CHARSET_INFO *refcs)
+{
+  if (!simple_8bit_collation_data_is_full(cs))
+    cs->sort_order= refcs->sort_order;
+}
+
+
+static my_bool simple_cs_is_full(CHARSET_INFO *cs)
+{
+  return  cs->number && cs->csname && cs->name &&
+          simple_8bit_charset_data_is_full(cs) &&
+          (simple_8bit_collation_data_is_full(cs) || cs->tailoring);
+}
+
+
+#if defined(HAVE_UCA_COLLATIONS) && (defined(HAVE_CHARSET_ucs2) || defined(HAVE_CHARSET_utf8mb3))
+/**
+  Initialize a loaded collation.
+  @param [OUT] to     - The new charset_info_st structure to initialize.
+  @param [IN]  from   - A template collation, to fill the missing data from.
+  @param [IN]  loaded - The collation data loaded from the LDML file.
+                        some data may be missing in "loaded".
+*/
+static void
+copy_uca_collation(struct charset_info_st *to, CHARSET_INFO *from,
+                   CHARSET_INFO *loaded)
+{
+  to->cset= from->cset;
+  to->coll= from->coll;
+  /*
+    Single-level UCA collation have strnxfrm_multiple=8.
+    In case of a multi-level UCA collation we use strnxfrm_multiply=4.
+    That means MY_COLLATION_HANDLER::strnfrmlen() will request the caller
+    to allocate a buffer smaller size for each level, for performance purpose,
+    and to fit longer VARCHARs to @@max_sort_length.
+    This makes filesort produce non-precise order for some rare Unicode
+    characters that produce more than 4 weights (long expansions).
+    UCA requires 2 bytes per weight multiplied by the number of levels.
+    In case of a 2-level collation, each character requires 4*2=8 bytes.
+    Therefore, the longest VARCHAR that fits into the default @@max_sort_length
+    is 1024/8=VARCHAR(128). With strnxfrm_multiply==8, only VARCHAR(64)
+    would fit.
+    Note, the built-in collation utf8_thai_520_w2 also uses strnxfrm_multiply=4,
+    for the same purpose.
+    TODO: we could add a new LDML syntax to choose strxfrm_multiply value.
+  */
+  to->strxfrm_multiply= loaded->levels_for_order > 1 ?
+                        4 : from->strxfrm_multiply;
+  to->min_sort_char= from->min_sort_char;
+  to->max_sort_char= from->max_sort_char;
+  to->mbminlen= from->mbminlen;
+  to->mbmaxlen= from->mbmaxlen;
+  to->caseup_multiply= from->caseup_multiply;
+  to->casedn_multiply= from->casedn_multiply;
+  to->state|= MY_CS_AVAILABLE | MY_CS_LOADED |
+              MY_CS_STRNXFRM  | MY_CS_UNICODE;
+}
+#endif
+
+
+static int add_collation(struct charset_info_st *cs)
+{
+  if (cs->name && (cs->number ||
+                   (cs->number=get_collation_number_internal(cs->name))) &&
+      cs->number < array_elements(all_charsets))
+  {
+    struct charset_info_st *newcs;
+    if (!(newcs= (struct charset_info_st*) all_charsets[cs->number]))
+    {
+      if (!(all_charsets[cs->number]= newcs=
+         (struct charset_info_st*) my_once_alloc(sizeof(CHARSET_INFO),MYF(0))))
+        return MY_XML_ERROR;
+      bzero(newcs,sizeof(CHARSET_INFO));
+    }
+    else
+    {
+      /* Don't allow change of csname */
+      if (newcs->csname && strcmp(newcs->csname, cs->csname))
+      {
+        my_error(EE_DUPLICATE_CHARSET, MYF(ME_WARNING),
+                 cs->number, cs->csname, newcs->csname);
+        /*
+          Continue parsing rest of Index.xml. We got an warning in the log
+          so the user can fix the wrong character set definition.
+        */
+        return MY_XML_OK;
+      }
+    }
+
+    if (cs->primary_number == cs->number)
+      cs->state |= MY_CS_PRIMARY;
+      
+    if (cs->binary_number == cs->number)
+      cs->state |= MY_CS_BINSORT;
+    
+    newcs->state|= cs->state;
+    
+    if (!(newcs->state & MY_CS_COMPILED))
+    {
+      if (cs_copy_data(newcs,cs))
+        return MY_XML_ERROR;
+
+      newcs->caseup_multiply= newcs->casedn_multiply= 1;
+      newcs->levels_for_order= 1;
+      
+      if (!strcmp(cs->csname,"ucs2") )
+      {
+#if defined(HAVE_CHARSET_ucs2) && defined(HAVE_UCA_COLLATIONS)
+        copy_uca_collation(newcs, newcs->state & MY_CS_NOPAD ?
+                                  &my_charset_ucs2_unicode_nopad_ci :
+                                  &my_charset_ucs2_unicode_ci,
+                                  cs);
+        newcs->state|= MY_CS_AVAILABLE | MY_CS_LOADED | MY_CS_NONASCII;
+#endif        
+      }
+      else if (!strcmp(cs->csname, "utf8") || !strcmp(cs->csname, "utf8mb3"))
+      {
+#if defined (HAVE_CHARSET_utf8mb3) && defined(HAVE_UCA_COLLATIONS)
+        copy_uca_collation(newcs, newcs->state & MY_CS_NOPAD ?
+                                  &my_charset_utf8mb3_unicode_nopad_ci :
+                                  &my_charset_utf8mb3_unicode_ci,
+                                  cs);
+        newcs->m_ctype= my_charset_utf8mb3_unicode_ci.m_ctype;
+        if (init_state_maps(newcs))
+          return MY_XML_ERROR;
+#endif
+      }
+      else if (!strcmp(cs->csname, "utf8mb4"))
+      {
+#if defined (HAVE_CHARSET_utf8mb4) && defined(HAVE_UCA_COLLATIONS)
+        copy_uca_collation(newcs, newcs->state & MY_CS_NOPAD ?
+                                  &my_charset_utf8mb4_unicode_nopad_ci :
+                                  &my_charset_utf8mb4_unicode_ci,
+                                  cs);
+        newcs->m_ctype= my_charset_utf8mb4_unicode_ci.m_ctype;
+        newcs->state|= MY_CS_AVAILABLE | MY_CS_LOADED;
+#endif
+      }
+      else if (!strcmp(cs->csname, "utf16"))
+      {
+#if defined (HAVE_CHARSET_utf16) && defined(HAVE_UCA_COLLATIONS)
+        copy_uca_collation(newcs, newcs->state & MY_CS_NOPAD ?
+                                  &my_charset_utf16_unicode_nopad_ci :
+                                  &my_charset_utf16_unicode_ci,
+                                  cs);
+        newcs->state|= MY_CS_AVAILABLE | MY_CS_LOADED | MY_CS_NONASCII;
+#endif
+      }
+      else if (!strcmp(cs->csname, "utf32"))
+      {
+#if defined (HAVE_CHARSET_utf32) && defined(HAVE_UCA_COLLATIONS)
+        copy_uca_collation(newcs, newcs->state & MY_CS_NOPAD ?
+                                  &my_charset_utf32_unicode_nopad_ci :
+                                  &my_charset_utf32_unicode_ci,
+                                  cs);
+        newcs->state|= MY_CS_AVAILABLE | MY_CS_LOADED | MY_CS_NONASCII;
+#endif
+      }
+      else
+      {
+        simple_cs_init_functions(newcs);
+        newcs->mbminlen= 1;
+        newcs->mbmaxlen= 1;
+        newcs->strxfrm_multiply= 1;
+        if (simple_cs_is_full(newcs))
+        {
+          newcs->state |= MY_CS_LOADED;
+        }
+      }
+      add_compiled_extra_collation(newcs);
+    }
+    else
+    {
+      /*
+        We need the below to make get_charset_name()
+        and get_charset_number() working even if a
+        character set has not been really incompiled.
+        The above functions are used for example
+        in error message compiler extra/comp_err.c.
+        If a character set was compiled, this information
+        will get lost and overwritten in add_compiled_collation().
+      */
+      newcs->number= cs->number;
+      if (cs->comment)
+	if (!(newcs->comment= my_once_strdup(cs->comment,MYF(MY_WME))))
+	  return MY_XML_ERROR;
+      if (cs->csname && ! newcs->csname)
+        if (!(newcs->csname= my_once_strdup(cs->csname,MYF(MY_WME))))
+	  return MY_XML_ERROR;
+      if (cs->name)
+	if (!(newcs->name= my_once_strdup(cs->name,MYF(MY_WME))))
+	  return MY_XML_ERROR;
+    }
+    cs->number= 0;
+    cs->primary_number= 0;
+    cs->binary_number= 0;
+    cs->name= NULL;
+    cs->state= 0;
+    cs->sort_order= NULL;
+    cs->tailoring= NULL;
+  }
+  return MY_XML_OK;
+}
+
+
+/**
+  Report character set initialization errors and warnings.
+  Be silent by default: no warnings on the client side.
+*/
+static void
+default_reporter(enum loglevel level  __attribute__ ((unused)),
+                 const char *format  __attribute__ ((unused)),
+                 ...)
+{
+}
+my_error_reporter my_charset_error_reporter= default_reporter;
+
+
+/**
+  Wrappers for memory functions my_malloc (and friends)
+  with C-compatbile API without extra "myf" argument.
+*/
+static void *
+my_once_alloc_c(size_t size)
+{ return my_once_alloc(size, MYF(MY_WME)); }
+
+
+static void *
+my_malloc_c(size_t size)
+{ return my_malloc(key_memory_charset_loader, size, MYF(MY_WME)); }
+
+
+static void *
+my_realloc_c(void *old, size_t size)
+{ return my_realloc(key_memory_charset_loader, old, size, MYF(MY_WME|MY_ALLOW_ZERO_PTR)); }
+
+
+/**
+  Initialize character set loader to use mysys memory management functions.
+  @param loader  Loader to initialize
+*/
+void
+my_charset_loader_init_mysys(MY_CHARSET_LOADER *loader)
+{
+  loader->error[0]= '\0';
+  loader->once_alloc= my_once_alloc_c;
+  loader->malloc= my_malloc_c;
+  loader->realloc= my_realloc_c;
+  loader->free= my_free;
+  loader->reporter= my_charset_error_reporter;
+  loader->add_collation= add_collation;
+}
+
+
+#define MY_MAX_ALLOWED_BUF 1024*1024
+#define MY_CHARSET_INDEX "Index.xml"
+
+const char *charsets_dir= NULL;
+
+
+static my_bool
+my_read_charset_file(MY_CHARSET_LOADER *loader,
+                     const char *filename,
+                     myf myflags)
+{
+  uchar *buf;
+  int  fd;
+  size_t len, tmp_len;
+  MY_STAT stat_info;
+  
+  if (!my_stat(filename, &stat_info, MYF(myflags)) ||
+       ((len= (uint)stat_info.st_size) > MY_MAX_ALLOWED_BUF) ||
+       !(buf= (uchar*) my_malloc(key_memory_charset_loader,len,myflags)))
+    return TRUE;
+  
+  if ((fd= mysql_file_open(key_file_charset, filename, O_RDONLY, myflags)) < 0)
+    goto error;
+  tmp_len= mysql_file_read(fd, buf, len, myflags);
+  mysql_file_close(fd, myflags);
+  if (tmp_len != len)
+    goto error;
+  
+  if (my_parse_charset_xml(loader, (char *) buf, len))
+  {
+    my_printf_error(EE_UNKNOWN_CHARSET, "Error while parsing '%s': %s\n",
+                    MYF(0), filename, loader->error);
+    goto error;
+  }
+  
+  my_free(buf);
+  return FALSE;
+
+error:
+  my_free(buf);
+  return TRUE;
+}
+
+
+char *get_charsets_dir(char *buf)
+{
+  const char *sharedir= SHAREDIR;
+  char *res;
+  DBUG_ENTER("get_charsets_dir");
+
+  if (charsets_dir != NULL)
+    strmake(buf, charsets_dir, FN_REFLEN-1);
+  else
+  {
+    if (test_if_hard_path(sharedir) ||
+	is_prefix(sharedir, DEFAULT_CHARSET_HOME))
+      strxmov(buf, sharedir, "/", CHARSET_DIR, NullS);
+    else
+      strxmov(buf, DEFAULT_CHARSET_HOME, "/", sharedir, "/", CHARSET_DIR,
+	      NullS);
+  }
+  res= convert_dirname(buf,buf,NullS);
+  DBUG_PRINT("info",("charsets dir: '%s'", buf));
+  DBUG_RETURN(res);
+}
+
+CHARSET_INFO *all_charsets[MY_ALL_CHARSETS_SIZE]={NULL};
+CHARSET_INFO *default_charset_info = &my_charset_latin1;
+
+
+/*
+  Add standard character set compiled into the application
+  All related character sets should share same cname
+*/
+
+void add_compiled_collation(struct charset_info_st *cs)
+{
+  DBUG_ASSERT(cs->number < array_elements(all_charsets));
+  all_charsets[cs->number]= cs;
+  cs->state|= MY_CS_AVAILABLE;
+  if ((my_hash_insert(&charset_name_hash, (uchar*) cs)))
+  {
+#ifndef DBUG_OFF
+    CHARSET_INFO *org= (CHARSET_INFO*) my_hash_search(&charset_name_hash,
+                                                      (uchar*) cs->csname,
+                                                      strlen(cs->csname));
+    DBUG_ASSERT(org);
+    DBUG_ASSERT(org->csname == cs->csname);
+#endif
+  }
+}
+
+
+/*
+  Add optional characters sets from ctype-extra.c
+
+  If cname is already in use, replace csname in new object with a pointer to
+  the already used csname to ensure that all csname's points to the same string
+  for the same character set.
+*/
+
+
+void add_compiled_extra_collation(struct charset_info_st *cs)
+{
+  DBUG_ASSERT(cs->number < array_elements(all_charsets));
+  all_charsets[cs->number]= cs;
+  cs->state|= MY_CS_AVAILABLE;
+  if ((my_hash_insert(&charset_name_hash, (uchar*) cs)))
+  {
+    CHARSET_INFO *org= (CHARSET_INFO*) my_hash_search(&charset_name_hash,
+                                                      (uchar*) cs->csname,
+                                                      strlen(cs->csname));
+    cs->csname= org->csname;
+  }
+}
+
+
+
+static my_pthread_once_t charsets_initialized= MY_PTHREAD_ONCE_INIT;
+static my_pthread_once_t charsets_template= MY_PTHREAD_ONCE_INIT;
+
+typedef struct
+{
+  ulonglong use_count;
+} MY_COLLATION_STATISTICS;
+
+
+static MY_COLLATION_STATISTICS my_collation_statistics[MY_ALL_CHARSETS_SIZE];
+
+
+my_bool my_collation_is_known_id(uint id)
+{
+  return id > 0 && id < array_elements(all_charsets) && all_charsets[id] ?
+         TRUE : FALSE;
+}
+
+
+/*
+  Collation use statistics functions do not lock
+  counters to avoid mutex contention. This can lose
+  some counter increments with high thread concurrency.
+  But this should be Ok, as we don't need exact numbers.
+*/
+static inline void my_collation_statistics_inc_use_count(uint id)
+{
+  DBUG_ASSERT(my_collation_is_known_id(id));
+  my_collation_statistics[id].use_count++;
+}
+
+
+ulonglong my_collation_statistics_get_use_count(uint id)
+{
+  DBUG_ASSERT(my_collation_is_known_id(id));
+  return my_collation_statistics[id].use_count;
+}
+
+
+const char *my_collation_get_tailoring(uint id)
+{
+  /* all_charsets[id]->tailoring is never changed after server startup. */
+  DBUG_ASSERT(my_collation_is_known_id(id));
+  return all_charsets[id]->tailoring;
+}
+
+
+HASH charset_name_hash;
+
+static uchar *get_charset_key(const uchar *object,
+                              size_t *size,
+                              my_bool not_used __attribute__((unused)))
+{
+  CHARSET_INFO *cs= (CHARSET_INFO*) object;
+  *size= strlen(cs->csname);
+  return (uchar*) cs->csname;
+}
+
+static void init_available_charsets(void)
+{
+  char fname[FN_REFLEN + sizeof(MY_CHARSET_INDEX)];
+  struct charset_info_st **cs;
+  MY_CHARSET_LOADER loader;
+  DBUG_ENTER("init_available_charsets");
+
+  bzero((char*) &all_charsets,sizeof(all_charsets));
+  bzero((char*) &my_collation_statistics, sizeof(my_collation_statistics));
+
+  my_hash_init2(key_memory_charsets, &charset_name_hash, 16,
+                &my_charset_latin1, 64, 0, 0, get_charset_key,
+                0, 0, HASH_UNIQUE);
+
+  init_compiled_charsets(MYF(0));
+
+  /* Copy compiled charsets */
+  for (cs= (struct charset_info_st**) all_charsets;
+       cs < (struct charset_info_st**) all_charsets +
+            array_elements(all_charsets)-1 ;
+       cs++)
+  {
+    if (*cs)
+    {
+      DBUG_ASSERT(cs[0]->mbmaxlen <= MY_CS_MBMAXLEN);
+      if (cs[0]->m_ctype)
+        if (init_state_maps(*cs))
+          *cs= NULL;
+    }
+  }
+
+  my_charset_loader_init_mysys(&loader);
+  strmov(get_charsets_dir(fname), MY_CHARSET_INDEX);
+  my_read_charset_file(&loader, fname, MYF(0));
+  DBUG_VOID_RETURN;
+}
+
+
+void free_charsets(void)
+{
+  charsets_initialized= charsets_template;
+  my_hash_free(&charset_name_hash);
+}
+
+
+static const char*
+get_collation_name_alias(const char *name, char *buf, size_t bufsize)
+{
+  if (!strncasecmp(name, "utf8mb3_", 8))
+  {
+    my_snprintf(buf, bufsize, "utf8_%s", name + 8);
+    return buf;
+  }
+  return NULL;
+}
+
+
+uint get_collation_number(const char *name)
+{
+  uint id;
+  char alias[64];
+  my_pthread_once(&charsets_initialized, init_available_charsets);
+  if ((id= get_collation_number_internal(name)))
+    return id;
+  if ((name= get_collation_name_alias(name, alias, sizeof(alias))))
+    return get_collation_number_internal(name);
+  return 0;
+}
+
+
+static uint
+get_charset_number_internal(const char *charset_name, uint cs_flags)
+{
+  CHARSET_INFO **cs;
+  
+  for (cs= all_charsets;
+       cs < all_charsets + array_elements(all_charsets);
+       cs++)
+  {
+    if ( cs[0] && cs[0]->csname && (cs[0]->state & cs_flags) &&
+         !my_strcasecmp(&my_charset_latin1, cs[0]->csname, charset_name))
+      return cs[0]->number;
+  }  
+  return 0;
+}
+
+
+static const char*
+get_charset_name_alias(const char *name)
+{
+  if (!my_strcasecmp(&my_charset_latin1, name, "utf8mb3"))
+    return "utf8";
+  return NULL;
+}
+
+
+uint get_charset_number(const char *charset_name, uint cs_flags)
+{
+  uint id;
+  my_pthread_once(&charsets_initialized, init_available_charsets);
+  if ((id= get_charset_number_internal(charset_name, cs_flags)))
+    return id;
+  if ((charset_name= get_charset_name_alias(charset_name)))
+    return get_charset_number_internal(charset_name, cs_flags);
+  return 0;
+}
+                  
+
+const char *get_charset_name(uint charset_number)
+{
+  my_pthread_once(&charsets_initialized, init_available_charsets);
+
+  if (charset_number < array_elements(all_charsets))
+  {
+    CHARSET_INFO *cs= all_charsets[charset_number];
+
+    if (cs && (cs->number == charset_number) && cs->name)
+      return (char*) cs->name;
+  }
+  
+  return "?";   /* this mimics find_type() */
+}
+
+
+static CHARSET_INFO *inheritance_source_by_id(CHARSET_INFO *cs, uint refid)
+{
+  CHARSET_INFO *refcs;
+  return refid && refid != cs->number &&
+         (refcs= all_charsets[refid]) &&
+         (refcs->state & MY_CS_AVAILABLE) ? refcs : NULL;
+}
+
+
+static CHARSET_INFO *find_collation_data_inheritance_source(CHARSET_INFO *cs)
+{
+  const char *beg, *end;
+  if (cs->tailoring &&
+      !strncmp(cs->tailoring, "[import ", 8) &&
+      (end= strchr(cs->tailoring + 8, ']')) &&
+      (beg= cs->tailoring + 8) + MY_CS_NAME_SIZE > end)
+  {
+    char name[MY_CS_NAME_SIZE + 1];
+    memcpy(name, beg, end - beg);
+    name[end - beg]= '\0';
+    return inheritance_source_by_id(cs, get_collation_number(name));
+  }
+  return NULL;
+}
+
+
+static CHARSET_INFO *find_charset_data_inheritance_source(CHARSET_INFO *cs)
+{
+  uint refid= get_charset_number_internal(cs->csname, MY_CS_PRIMARY);
+  return inheritance_source_by_id(cs, refid);
+}
+
+
+static CHARSET_INFO *
+get_internal_charset(MY_CHARSET_LOADER *loader, uint cs_number, myf flags)
+{
+  char  buf[FN_REFLEN];
+  struct charset_info_st *cs;
+
+  DBUG_ASSERT(cs_number < array_elements(all_charsets));
+
+  if ((cs= (struct charset_info_st*) all_charsets[cs_number]))
+  {
+    if (cs->state & MY_CS_READY)  /* if CS is already initialized */
+    {
+      my_collation_statistics_inc_use_count(cs_number);
+      return cs;
+    }
+
+    /*
+      To make things thread safe we are not allowing other threads to interfere
+      while we may changing the cs_info_table
+    */
+    mysql_mutex_lock(&THR_LOCK_charset);
+
+    if (!(cs->state & (MY_CS_COMPILED|MY_CS_LOADED))) /* if CS is not in memory */
+    {
+      MY_CHARSET_LOADER loader;
+      strxmov(get_charsets_dir(buf), cs->csname, ".xml", NullS);
+      my_charset_loader_init_mysys(&loader);
+      my_read_charset_file(&loader, buf, flags);
+    }
+
+    if (cs->state & MY_CS_AVAILABLE)
+    {
+      if (!(cs->state & MY_CS_READY))
+      {
+        if (!simple_8bit_charset_data_is_full(cs))
+        {
+          CHARSET_INFO *refcs= find_charset_data_inheritance_source(cs);
+          if (refcs)
+            inherit_charset_data(cs, refcs);
+        }
+        if (!simple_8bit_collation_data_is_full(cs))
+        {
+          CHARSET_INFO *refcl= find_collation_data_inheritance_source(cs);
+          if (refcl)
+            inherit_collation_data(cs, refcl);
+        }
+
+        if (my_ci_init_charset(cs, loader) ||
+            my_ci_init_collation(cs, loader))
+        {
+          cs= NULL;
+        }
+        else
+          cs->state|= MY_CS_READY;
+      }
+      my_collation_statistics_inc_use_count(cs_number);
+    }
+    else
+      cs= NULL;
+
+    mysql_mutex_unlock(&THR_LOCK_charset);
+  }
+  return cs;
+}
+
+
+CHARSET_INFO *get_charset(uint cs_number, myf flags)
+{
+  CHARSET_INFO *cs= NULL;
+
+  if (cs_number == default_charset_info->number)
+    return default_charset_info;
+
+  my_pthread_once(&charsets_initialized, init_available_charsets);
+
+  if (cs_number < array_elements(all_charsets))
+  {
+    MY_CHARSET_LOADER loader;
+    my_charset_loader_init_mysys(&loader);
+    cs= get_internal_charset(&loader, cs_number, flags);
+  }
+
+  if (!cs && (flags & MY_WME))
+  {
+    char index_file[FN_REFLEN + sizeof(MY_CHARSET_INDEX)], cs_string[23];
+    strmov(get_charsets_dir(index_file),MY_CHARSET_INDEX);
+    cs_string[0]='#';
+    int10_to_str(cs_number, cs_string+1, 10);
+    my_error(EE_UNKNOWN_CHARSET, MYF(ME_BELL), cs_string, index_file);
+  }
+  return cs;
+}
+
+
+/**
+  Find collation by name: extended version of get_charset_by_name()
+  to return error messages to the caller.
+  @param   loader  Character set loader
+  @param   name    Collation name
+  @param   flags   Flags
+  @return          NULL on error, pointer to collation on success
+*/
+
+CHARSET_INFO *
+my_collation_get_by_name(MY_CHARSET_LOADER *loader,
+                         const char *name, myf flags)
+{
+  uint cs_number;
+  CHARSET_INFO *cs;
+  my_pthread_once(&charsets_initialized, init_available_charsets);
+
+  cs_number= get_collation_number(name);
+  my_charset_loader_init_mysys(loader);
+  cs= cs_number ? get_internal_charset(loader, cs_number, flags) : NULL;
+
+  if (!cs && (flags & MY_WME))
+  {
+    char index_file[FN_REFLEN + sizeof(MY_CHARSET_INDEX)];
+    strmov(get_charsets_dir(index_file),MY_CHARSET_INDEX);
+    my_error(EE_UNKNOWN_COLLATION, MYF(ME_BELL), name, index_file);
+  }
+  return cs;
+}
+
+
+CHARSET_INFO *get_charset_by_name(const char *cs_name, myf flags)
+{
+  MY_CHARSET_LOADER loader;
+  my_charset_loader_init_mysys(&loader);
+  return my_collation_get_by_name(&loader, cs_name, flags);
+}
+
+
+/**
+  Find character set by name: extended version of get_charset_by_csname()
+  to return error messages to the caller.
+  @param   loader   Character set loader
+  @param   name     Collation name
+  @param   cs_flags Character set flags (e.g. default or binary collation)
+  @param   flags    Flags
+  @return           NULL on error, pointer to collation on success
+*/
+CHARSET_INFO *
+my_charset_get_by_name(MY_CHARSET_LOADER *loader,
+                       const char *cs_name, uint cs_flags, myf flags)
+{
+  uint cs_number;
+  CHARSET_INFO *cs;
+  DBUG_ENTER("get_charset_by_csname");
+  DBUG_PRINT("enter",("name: '%s'", cs_name));
+
+  my_pthread_once(&charsets_initialized, init_available_charsets);
+
+  cs_number= get_charset_number(cs_name, cs_flags);
+  cs= cs_number ? get_internal_charset(loader, cs_number, flags) : NULL;
+
+  if (!cs && (flags & MY_WME))
+  {
+    char index_file[FN_REFLEN + sizeof(MY_CHARSET_INDEX)];
+    strmov(get_charsets_dir(index_file),MY_CHARSET_INDEX);
+    my_error(EE_UNKNOWN_CHARSET, MYF(ME_BELL), cs_name, index_file);
+  }
+
+  DBUG_RETURN(cs);
+}
+
+
+CHARSET_INFO *
+get_charset_by_csname(const char *cs_name, uint cs_flags, myf flags)
+{
+  MY_CHARSET_LOADER loader;
+  my_charset_loader_init_mysys(&loader);
+  return my_charset_get_by_name(&loader, cs_name, cs_flags, flags);
+}
+
+
+/**
+  Resolve character set by the character set name (utf8, latin1, ...).
+
+  The function tries to resolve character set by the specified name. If
+  there is character set with the given name, it is assigned to the "cs"
+  parameter and FALSE is returned. If there is no such character set,
+  "default_cs" is assigned to the "cs" and TRUE is returned.
+
+  @param[in] cs_name    Character set name.
+  @param[in] default_cs Default character set.
+  @param[out] cs        Variable to store character set.
+
+  @return FALSE if character set was resolved successfully; TRUE if there
+  is no character set with given name.
+*/
+
+my_bool resolve_charset(const char *cs_name,
+                        CHARSET_INFO *default_cs,
+                        CHARSET_INFO **cs)
+{
+  *cs= get_charset_by_csname(cs_name, MY_CS_PRIMARY, MYF(0));
+
+  if (*cs == NULL)
+  {
+    *cs= default_cs;
+    return TRUE;
+  }
+
+  return FALSE;
+}
+
+
+/**
+  Resolve collation by the collation name (utf8_general_ci, ...).
+
+  The function tries to resolve collation by the specified name. If there
+  is collation with the given name, it is assigned to the "cl" parameter
+  and FALSE is returned. If there is no such collation, "default_cl" is
+  assigned to the "cl" and TRUE is returned.
+
+  @param[out] cl        Variable to store collation.
+  @param[in] cl_name    Collation name.
+  @param[in] default_cl Default collation.
+
+  @return FALSE if collation was resolved successfully; TRUE if there is no
+  collation with given name.
+*/
+
+my_bool resolve_collation(const char *cl_name,
+                          CHARSET_INFO *default_cl,
+                          CHARSET_INFO **cl)
+{
+  *cl= get_charset_by_name(cl_name, MYF(0));
+
+  if (*cl == NULL)
+  {
+    *cl= default_cl;
+    return TRUE;
+  }
+
+  return FALSE;
+}
+
+
+/*
+  Escape string with backslashes (\)
+
+  SYNOPSIS
+    escape_string_for_mysql()
+    charset_info        Charset of the strings
+    to                  Buffer for escaped string
+    to_length           Length of destination buffer, or 0
+    from                The string to escape
+    length              The length of the string to escape
+
+  DESCRIPTION
+    This escapes the contents of a string by adding backslashes before special
+    characters, and turning others into specific escape sequences, such as
+    turning newlines into \n and null bytes into \0.
+
+  NOTE
+    To maintain compatibility with the old C API, to_length may be 0 to mean
+    "big enough"
+
+  RETURN VALUES
+    (size_t) -1 The escaped string did not fit in the to buffer
+    #           The length of the escaped string
+*/
+
+size_t escape_string_for_mysql(CHARSET_INFO *charset_info,
+                               char *to, size_t to_length,
+                               const char *from, size_t length)
+{
+  const char *to_start= to;
+  const char *end, *to_end=to_start + (to_length ? to_length-1 : 2*length);
+  my_bool overflow= FALSE;
+  for (end= from + length; from < end; from++)
+  {
+    char escape= 0;
+#ifdef USE_MB
+    int tmp_length= my_ci_charlen(charset_info, (const uchar *) from, (const uchar *) end);
+    if (tmp_length > 1)
+    {
+      if (to + tmp_length > to_end)
+      {
+        overflow= TRUE;
+        break;
+      }
+      while (tmp_length--)
+	*to++= *from++;
+      from--;
+      continue;
+    }
+    /*
+     If the next character appears to begin a multi-byte character, we
+     escape that first byte of that apparent multi-byte character. (The
+     character just looks like a multi-byte character -- if it were actually
+     a multi-byte character, it would have been passed through in the test
+     above.)
+
+     Without this check, we can create a problem by converting an invalid
+     multi-byte character into a valid one. For example, 0xbf27 is not
+     a valid GBK character, but 0xbf5c is. (0x27 = ', 0x5c = \)
+    */
+    if (tmp_length < 1) /* Bad byte sequence */
+      escape= *from;
+    else
+#endif
+    switch (*from) {
+    case 0:				/* Must be escaped for 'mysql' */
+      escape= '0';
+      break;
+    case '\n':				/* Must be escaped for logs */
+      escape= 'n';
+      break;
+    case '\r':
+      escape= 'r';
+      break;
+    case '\\':
+      escape= '\\';
+      break;
+    case '\'':
+      escape= '\'';
+      break;
+    case '"':				/* Better safe than sorry */
+      escape= '"';
+      break;
+    case '\032':			/* This gives problems on Win32 */
+      escape= 'Z';
+      break;
+    }
+    if (escape)
+    {
+      if (to + 2 > to_end)
+      {
+        overflow= TRUE;
+        break;
+      }
+      *to++= '\\';
+      *to++= escape;
+    }
+    else
+    {
+      if (to + 1 > to_end)
+      {
+        overflow= TRUE;
+        break;
+      }
+      *to++= *from;
+    }
+  }
+  *to= 0;
+  return overflow ? (size_t) -1 : (size_t) (to - to_start);
+}
+
+
+#ifdef BACKSLASH_MBTAIL
+static CHARSET_INFO *fs_cset_cache= NULL;
+
+CHARSET_INFO *fs_character_set()
+{
+  if (!fs_cset_cache)
+  {
+    char buf[10]= "cp";
+    GetLocaleInfo(LOCALE_SYSTEM_DEFAULT, LOCALE_IDEFAULTANSICODEPAGE,
+                  buf+2, sizeof(buf)-3);
+    /*
+      We cannot call get_charset_by_name here
+      because fs_character_set() is executed before
+      LOCK_THD_charset mutex initialization, which
+      is used inside get_charset_by_name.
+      As we're now interested in cp932 only,
+      let's just detect it using strcmp().
+    */
+    fs_cset_cache= 
+                #ifdef HAVE_CHARSET_cp932
+                        !strcmp(buf, "cp932") ? &my_charset_cp932_japanese_ci : 
+                #endif
+                        &my_charset_bin;
+  }
+  return fs_cset_cache;
+}
+#endif
+
+/*
+  Escape apostrophes by doubling them up
+
+  SYNOPSIS
+    escape_quotes_for_mysql()
+    charset_info        Charset of the strings
+    to                  Buffer for escaped string
+    to_length           Length of destination buffer, or 0
+    from                The string to escape
+    length              The length of the string to escape
+
+  DESCRIPTION
+    This escapes the contents of a string by doubling up any apostrophes that
+    it contains. This is used when the NO_BACKSLASH_ESCAPES SQL_MODE is in
+    effect on the server.
+
+  NOTE
+    To be consistent with escape_string_for_mysql(), to_length may be 0 to
+    mean "big enough"
+
+  RETURN VALUES
+    ~0          The escaped string did not fit in the to buffer
+    >=0         The length of the escaped string
+*/
+
+size_t escape_quotes_for_mysql(CHARSET_INFO *charset_info,
+                               char *to, size_t to_length,
+                               const char *from, size_t length)
+{
+  const char *to_start= to;
+  const char *end, *to_end=to_start + (to_length ? to_length-1 : 2*length);
+  my_bool overflow= FALSE;
+#ifdef USE_MB
+  my_bool use_mb_flag= my_ci_use_mb(charset_info);
+#endif
+  for (end= from + length; from < end; from++)
+  {
+#ifdef USE_MB
+    int tmp_length;
+    if (use_mb_flag && (tmp_length= my_ismbchar(charset_info, from, end)))
+    {
+      if (to + tmp_length > to_end)
+      {
+        overflow= TRUE;
+        break;
+      }
+      while (tmp_length--)
+	*to++= *from++;
+      from--;
+      continue;
+    }
+    /*
+      We don't have the same issue here with a non-multi-byte character being
+      turned into a multi-byte character by the addition of an escaping
+      character, because we are only escaping the ' character with itself.
+     */
+#endif
+    if (*from == '\'')
+    {
+      if (to + 2 > to_end)
+      {
+        overflow= TRUE;
+        break;
+      }
+      *to++= '\'';
+      *to++= '\'';
+    }
+    else
+    {
+      if (to + 1 > to_end)
+      {
+        overflow= TRUE;
+        break;
+      }
+      *to++= *from;
+    }
+  }
+  *to= 0;
+  return overflow ? (ulong)~0 : (ulong) (to - to_start);
+}
+
+
+typedef enum my_cs_match_type_enum
+{
+  /* MySQL and OS charsets are fully compatible */
+  my_cs_exact,
+  /* MySQL charset is very close to OS charset  */
+  my_cs_approx,
+  /*
+    MySQL knows this charset, but it is not supported as client character set.
+  */
+  my_cs_unsupp
+} my_cs_match_type;
+
+
+typedef struct str2str_st
+{
+  const char* os_name;
+  const char* my_name;
+  my_cs_match_type param;
+} MY_CSET_OS_NAME;
+
+static const MY_CSET_OS_NAME charsets[] =
+{
+#ifdef _WIN32
+  {"cp437",          "cp850",    my_cs_approx},
+  {"cp850",          "cp850",    my_cs_exact},
+  {"cp852",          "cp852",    my_cs_exact},
+  {"cp858",          "cp850",    my_cs_approx},
+  {"cp866",          "cp866",    my_cs_exact},
+  {"cp874",          "tis620",   my_cs_approx},
+  {"cp932",          "cp932",    my_cs_exact},
+  {"cp936",          "gbk",      my_cs_approx},
+  {"cp949",          "euckr",    my_cs_approx},
+  {"cp950",          "big5",     my_cs_exact},
+  {"cp1200",         "utf16le",  my_cs_unsupp},
+  {"cp1201",         "utf16",    my_cs_unsupp},
+  {"cp1250",         "cp1250",   my_cs_exact},
+  {"cp1251",         "cp1251",   my_cs_exact},
+  {"cp1252",         "latin1",   my_cs_exact},
+  {"cp1253",         "greek",    my_cs_exact},
+  {"cp1254",         "latin5",   my_cs_exact},
+  {"cp1255",         "hebrew",   my_cs_approx},
+  {"cp1256",         "cp1256",   my_cs_exact},
+  {"cp1257",         "cp1257",   my_cs_exact},
+  {"cp10000",        "macroman", my_cs_exact},
+  {"cp10001",        "sjis",     my_cs_approx},
+  {"cp10002",        "big5",     my_cs_approx},
+  {"cp10008",        "gb2312",   my_cs_approx},
+  {"cp10021",        "tis620",   my_cs_approx},
+  {"cp10029",        "macce",    my_cs_exact},
+  {"cp12001",        "utf32",    my_cs_unsupp},
+  {"cp20107",        "swe7",     my_cs_exact},
+  {"cp20127",        "latin1",   my_cs_approx},
+  {"cp20866",        "koi8r",    my_cs_exact},
+  {"cp20932",        "ujis",     my_cs_exact},
+  {"cp20936",        "gb2312",   my_cs_approx},
+  {"cp20949",        "euckr",    my_cs_approx},
+  {"cp21866",        "koi8u",    my_cs_exact},
+  {"cp28591",        "latin1",   my_cs_approx},
+  {"cp28592",        "latin2",   my_cs_exact},
+  {"cp28597",        "greek",    my_cs_exact},
+  {"cp28598",        "hebrew",   my_cs_exact},
+  {"cp28599",        "latin5",   my_cs_exact},
+  {"cp28603",        "latin7",   my_cs_exact},
+#ifdef UNCOMMENT_THIS_WHEN_WL_4579_IS_DONE
+  {"cp28605",        "latin9",   my_cs_exact},
+#endif
+  {"cp38598",        "hebrew",   my_cs_exact},
+  {"cp51932",        "ujis",     my_cs_exact},
+  {"cp51936",        "gb2312",   my_cs_exact},
+  {"cp51949",        "euckr",    my_cs_exact},
+  {"cp51950",        "big5",     my_cs_exact},
+#ifdef UNCOMMENT_THIS_WHEN_WL_WL_4024_IS_DONE
+  {"cp54936",        "gb18030",  my_cs_exact},
+#endif
+  {"cp65001",        "utf8",     my_cs_exact},
+
+#else /* not Windows */
+
+  {"646",            "latin1",   my_cs_approx}, /* Default on Solaris */
+  {"ANSI_X3.4-1968", "latin1",   my_cs_approx},
+  {"ansi1251",       "cp1251",   my_cs_exact},
+  {"armscii8",       "armscii8", my_cs_exact},
+  {"armscii-8",      "armscii8", my_cs_exact},
+  {"ASCII",          "latin1",   my_cs_approx},
+  {"Big5",           "big5",     my_cs_exact},
+  {"cp1251",         "cp1251",   my_cs_exact},
+  {"cp1255",         "hebrew",   my_cs_approx},
+  {"CP866",          "cp866",    my_cs_exact},
+  {"eucCN",          "gb2312",   my_cs_exact},
+  {"euc-CN",         "gb2312",   my_cs_exact},
+  {"eucJP",          "ujis",     my_cs_exact},
+  {"euc-JP",         "ujis",     my_cs_exact},
+  {"eucKR",          "euckr",    my_cs_exact},
+  {"euc-KR",         "euckr",    my_cs_exact},
+#ifdef UNCOMMENT_THIS_WHEN_WL_WL_4024_IS_DONE
+  {"gb18030",        "gb18030",  my_cs_exact},
+#endif
+  {"gb2312",         "gb2312",   my_cs_exact},
+  {"gbk",            "gbk",      my_cs_exact},
+  {"georgianps",     "geostd8",  my_cs_exact},
+  {"georgian-ps",    "geostd8",  my_cs_exact},
+  {"IBM-1252",       "cp1252",   my_cs_exact},
+
+  {"iso88591",       "latin1",   my_cs_approx},
+  {"ISO_8859-1",     "latin1",   my_cs_approx},
+  {"ISO8859-1",      "latin1",   my_cs_approx},
+  {"ISO-8859-1",     "latin1",   my_cs_approx},
+
+  {"iso885913",      "latin7",   my_cs_exact},
+  {"ISO_8859-13",    "latin7",   my_cs_exact},
+  {"ISO8859-13",     "latin7",   my_cs_exact},
+  {"ISO-8859-13",    "latin7",   my_cs_exact},
+
+#ifdef UNCOMMENT_THIS_WHEN_WL_4579_IS_DONE
+  {"iso885915",      "latin9",   my_cs_exact},
+  {"ISO_8859-15",    "latin9",   my_cs_exact},
+  {"ISO8859-15",     "latin9",   my_cs_exact},
+  {"ISO-8859-15",    "latin9",   my_cs_exact},
+#endif
+
+  {"iso88592",       "latin2",   my_cs_exact},
+  {"ISO_8859-2",     "latin2",   my_cs_exact},
+  {"ISO8859-2",      "latin2",   my_cs_exact},
+  {"ISO-8859-2",     "latin2",   my_cs_exact},
+
+  {"iso88597",       "greek",    my_cs_exact},
+  {"ISO_8859-7",     "greek",    my_cs_exact},
+  {"ISO8859-7",      "greek",    my_cs_exact},
+  {"ISO-8859-7",     "greek",    my_cs_exact},
+
+  {"iso88598",       "hebrew",   my_cs_exact},
+  {"ISO_8859-8",     "hebrew",   my_cs_exact},
+  {"ISO8859-8",      "hebrew",   my_cs_exact},
+  {"ISO-8859-8",     "hebrew",   my_cs_exact},
+
+  {"iso88599",       "latin5",   my_cs_exact},
+  {"ISO_8859-9",     "latin5",   my_cs_exact},
+  {"ISO8859-9",      "latin5",   my_cs_exact},
+  {"ISO-8859-9",     "latin5",   my_cs_exact},
+
+  {"koi8r",          "koi8r",    my_cs_exact},
+  {"KOI8-R",         "koi8r",    my_cs_exact},
+  {"koi8u",          "koi8u",    my_cs_exact},
+  {"KOI8-U",         "koi8u",    my_cs_exact},
+
+  {"roman8",         "hp8",      my_cs_exact}, /* Default on HP UX */
+
+  {"Shift_JIS",      "sjis",     my_cs_exact},
+  {"SJIS",           "sjis",     my_cs_exact},
+  {"shiftjisx0213",  "sjis",     my_cs_exact},
+
+  {"tis620",         "tis620",   my_cs_exact},
+  {"tis-620",        "tis620",   my_cs_exact},
+
+  {"ujis",           "ujis",     my_cs_exact},
+
+  {"US-ASCII",       "latin1",   my_cs_approx},
+
+  {"utf8",           "utf8",     my_cs_exact},
+  {"utf-8",          "utf8",     my_cs_exact},
+#endif
+  {NULL,             NULL,       0}
+};
+
+
+static const char*
+my_os_charset_to_mysql_charset(const char* csname)
+{
+  const MY_CSET_OS_NAME* csp;
+  for (csp = charsets; csp->os_name; csp++)
+  {
+    if (!strcasecmp(csp->os_name, csname))
+    {
+      switch (csp->param)
+      {
+      case my_cs_exact:
+        return csp->my_name;
+
+      case my_cs_approx:
+        /*
+          Maybe we should print a warning eventually:
+          character set correspondence is not exact.
+        */
+        return csp->my_name;
+
+      default:
+        return NULL;
+      }
+    }
+  }
+  return NULL;
+}
+
+const char* my_default_csname()
+{
+  const char* csname = NULL;
+#ifdef _WIN32
+  char cpbuf[64];
+  int cp = GetConsoleCP();
+  if (cp == 0)
+    cp = GetACP();
+  snprintf(cpbuf, sizeof(cpbuf), "cp%d", (int)cp);
+  csname = my_os_charset_to_mysql_charset(cpbuf);
+#elif defined(HAVE_SETLOCALE) && defined(HAVE_NL_LANGINFO)
+  if (setlocale(LC_CTYPE, "") && (csname = nl_langinfo(CODESET)))
+    csname = my_os_charset_to_mysql_charset(csname);
+#endif
+  return csname ? csname : MYSQL_DEFAULT_CHARSET_NAME;
+}