fixed bug #2592 mysqldump doesn't quote "tricky" names correctly

mysql-test/r/mysqldump.result:
  added test for 
  bug #2592 mysqldump doesn't quote "tricky" names correctly
  please note, output's still looking wrong because of bug #2593
  it will be fixed when fix for bug #2593 will be pushed
mysql-test/t/mysqldump.test:
  added test for bug 
  #2592 mysqldump doesn't quote "tricky" names correctly
sql/sql_lex.cc:
  fixed processing of multibyte quoted variables

client/mysqldump.c

@@ -649,7 +649,7 @@ static char *quote_name(const char *name, char *buff, my_bool force)
   while (*name)
   {
     if (*name == QUOTE_CHAR)
-      *to= QUOTE_CHAR;
+      *to++= QUOTE_CHAR;
     *to++= *name++;
   }
   to[0]=QUOTE_CHAR;
@@ -1647,7 +1647,7 @@ static int dump_all_tables_in_db(char *database)
   if (opt_xml)
     fputs("</database>\n", md_result_file);
   if (lock_tables)
-    mysql_query(sock,"UNLOCK_TABLES");
+    mysql_query(sock,"UNLOCK TABLES");
   return 0;
 } /* dump_all_tables_in_db */
 

mysql-test/r/mysqldump.result

@@ -123,3 +123,21 @@ UNLOCK TABLES;
 /*!40101 SET CHARACTER_SET_CLIENT=@OLD_CHARACTER_SET_CLIENT */;
 
 DROP TABLE t1;
+create table ```a` (i int);
+DROP TABLE IF EXISTS ```a`;
+CREATE TABLE ``a` (
+  `i` int(11) default NULL
+) ENGINE=MyISAM DEFAULT CHARSET=latin1;
+
+
+/*!40000 ALTER TABLE ```a` DISABLE KEYS */;
+LOCK TABLES ```a` WRITE;
+UNLOCK TABLES;
+/*!40000 ALTER TABLE ```a` ENABLE KEYS */;
+
+/*!40101 SET SQL_MODE=@OLD_SQL_MODE */;
+/*!40014 SET FOREIGN_KEY_CHECKS=@OLD_FOREIGN_KEY_CHECKS */;
+/*!40014 SET UNIQUE_CHECKS=@OLD_UNIQUE_CHECKS */;
+/*!40101 SET CHARACTER_SET_CLIENT=@OLD_CHARACTER_SET_CLIENT */;
+
+drop table ```a`;

mysql-test/t/mysqldump.test

@@ -53,3 +53,11 @@ CREATE TABLE t1 (a  VARCHAR(255)) DEFAULT CHARSET koi8r;
 INSERT INTO t1  VALUES (_koi8r x'C1C2C3C4C5');
 --exec $MYSQL_DUMP  --skip-comments test t1
 DROP TABLE t1;
+
+#
+# Bug #2592
+#
+
+create table ```a` (i int);
+--exec $MYSQL_DUMP  --skip-comments test
+drop table ```a`;
\ No newline at end of file

sql/sql_lex.cc

@@ -667,13 +667,24 @@ int yylex(void *arg, void *yythd)
 
     case MY_LEX_USER_VARIABLE_DELIMITER:
     {
-      char delim= c;				// Used char
+      uint double_quotes= 0;
+      char quote_char= c;                       // Used char
       lex->tok_start=lex->ptr;			// Skip first `
 #ifdef USE_MB
       if (use_mb(cs))
       {
-	while ((c=yyGet()) && c != delim && c != (uchar) NAMES_SEP_CHAR)
+	while ((c= yyGet()))
 	{
+	  if (c == quote_char)
+	  {
+	    if (yyPeek() != quote_char)
+	      break;
+	    c= yyGet();
+	    double_quotes++;
+	    continue;
+	  }
+	  if (c == (uchar) NAMES_SEP_CHAR)
+	    break;
           if (my_mbcharlen(cs, c) > 1)
           {
             int l;
@@ -684,13 +695,10 @@ int yylex(void *arg, void *yythd)
             lex->ptr += l-1;
           }
         }
-	yylval->lex_str=get_token(lex,yyLength());
       }
       else
 #endif
       {
-	uint double_quotes= 0;
-	char quote_char= c;
 	while ((c=yyGet()))
 	{
 	  if (c == quote_char)
@@ -704,13 +712,13 @@ int yylex(void *arg, void *yythd)
 	  if (c == (uchar) NAMES_SEP_CHAR)
 	    break;
 	}
-	if (double_quotes)
-	  yylval->lex_str=get_quoted_token(lex,yyLength() - double_quotes,
-					   quote_char);
-	else
-	  yylval->lex_str=get_token(lex,yyLength());
       }
-      if (c == delim)
+      if (double_quotes)
+	yylval->lex_str=get_quoted_token(lex,yyLength() - double_quotes,
+					 quote_char);
+      else
+	yylval->lex_str=get_token(lex,yyLength());
+      if (c == quote_char)
 	yySkip();			// Skip end `
       lex->next_state= MY_LEX_START;
       return(IDENT_QUOTED);