New function my_charset_same()

BitKeeper/etc/logging_ok:
  Logging to logging@openlogging.org accepted

BitKeeper/etc/logging_ok

@@ -65,6 +65,7 @@ monty@work.mysql.com
 mwagner@cash.mwagner.org
 mwagner@evoq.mwagner.org
 mwagner@work.mysql.com
+mysql@home.(none)
 nick@mysql.com
 nick@nick.leippe.com
 papa@gbichot.local

include/m_ctype.h

@@ -199,6 +199,7 @@ extern CHARSET_INFO my_charset_latin1_de;
 extern CHARSET_INFO my_charset_sjis;
 extern CHARSET_INFO my_charset_tis620;
 extern CHARSET_INFO my_charset_ucs2;
+extern CHARSET_INFO my_charset_ucse;
 extern CHARSET_INFO my_charset_ujis;
 extern CHARSET_INFO my_charset_utf8;
 extern CHARSET_INFO my_charset_win1250ch;

include/my_sys.h

@@ -215,6 +215,7 @@ extern CHARSET_INFO *get_charset_by_csname(const char *cs_name,
 extern void free_charsets(void);
 extern char *list_charsets(myf want_flags); /* my_free() this string... */
 extern char *get_charsets_dir(char *buf);
+extern my_bool my_charset_same(CHARSET_INFO *cs1, CHARSET_INFO *cs2);
 
 
 /* statistics */

mysys/charset.c

@@ -33,6 +33,10 @@
     - Setting server default character set
 */
 
+my_bool my_charset_same(CHARSET_INFO *cs1, CHARSET_INFO *cs2)
+{
+  return ((cs1 == cs2) || !strcmp(cs1->csname,cs2->csname));
+}
 
 static void set_max_sort_char(CHARSET_INFO *cs)
 {

sql/item_func.cc

@@ -136,7 +136,7 @@ Item_func::fix_fields(THD *thd, TABLE_LIST *tables, Item **ref)
 	}
 	else if ((*arg)->coercibility < coercibility)
 	{
-	  if (strcmp(charset()->csname,(*arg)->charset()->csname))
+	  if (!my_charset_same(charset(),(*arg)->charset()))
 	  {
 	    set_charset(&my_charset_bin);
 	    coercibility= COER_NOCOLL;

sql/item_strfunc.cc

@@ -2216,7 +2216,7 @@ bool Item_func_set_collation::fix_fields(THD *thd,struct st_table_list *tables,
     return 1;
   }
   
-  if (strcmp(args[0]->charset()->csname,set_collation->csname))
+  if (!my_charset_same(args[0]->charset(),set_collation))
   {
     my_error(ER_COLLATION_CHARSET_MISMATCH, MYF(0), 
       set_collation->name,args[0]->charset()->csname);

sql/sql_yacc.yy

@@ -1284,7 +1284,7 @@ attribute:
 	| COMMENT_SYM text_literal { Lex->comment= $2; }
 	| COLLATE_SYM collation_name 
 	  { 
-	    if (Lex->charset && strcmp(Lex->charset->csname,$2->csname))
+	    if (Lex->charset && !my_charset_same(Lex->charset,$2))
 	    {
 	      net_printf(YYTHD,ER_COLLATION_CHARSET_MISMATCH,
 			 $2->name,Lex->charset->csname);
@@ -4250,7 +4250,7 @@ option_value:
 	  CHARSET_INFO *cs= $2 ? $2 : thd->db_charset;
 	  CHARSET_INFO *cl= $3 ? $3 : cs;
 
-	  if ((cl != cs) && strcmp(cs->csname,cl->csname))
+	  if (!my_charset_same(cs,cl))
 	  {
 	      net_printf(YYTHD,ER_COLLATION_CHARSET_MISMATCH, 
 		         cl->name,cs->csname);
@@ -4279,7 +4279,7 @@ option_value:
 	      YYABORT;
 	    }
 	  }
-	  else if ((cl != cs) && strcmp(cs->csname,cl->csname))
+	  else if (!my_charset_same(cs,cl))
 	  {
 	      net_printf(YYTHD,ER_COLLATION_CHARSET_MISMATCH, 
 		         cl->name,cs->csname);