Fix for bug #30654: mysqlcheck fails during upgrade of tables whose

names include backticks or blank

Problem: mysqlcheck doesn't escape backtick characters in the table names.

Fix: escape them.

client/mysqlcheck.c

@@ -186,6 +186,7 @@ static void dbDisconnect(char *host);
 static void DBerror(MYSQL *mysql, const char *when);
 static void safe_exit(int error);
 static void print_result();
+static uint fixed_name_length(const char *name);
 static char *fix_table_name(char *dest, char *src);
 int what_to_do = 0;
 
@@ -409,14 +410,14 @@ static int process_selected_tables(char *db, char **table_names, int tables)
   {
     /* 
       We need table list in form `a`, `b`, `c`
-      that's why we need 4 more chars added to to each table name
+      that's why we need 2 more chars added to to each table name
       space is for more readable output in logs and in case of error
     */	  
     char *table_names_comma_sep, *end;
     int i, tot_length = 0;
 
     for (i = 0; i < tables; i++)
-      tot_length += strlen(*(table_names + i)) + 4;
+      tot_length+= fixed_name_length(*(table_names + i)) + 2;
 
     if (!(table_names_comma_sep = (char *)
 	  my_malloc((sizeof(char) * tot_length) + 4, MYF(MY_WME))))
@@ -434,23 +435,46 @@ static int process_selected_tables(char *db, char **table_names, int tables)
   }
   else
     for (; tables > 0; tables--, table_names++)
-      handle_request_for_tables(*table_names, strlen(*table_names));
+      handle_request_for_tables(*table_names, fixed_name_length(*table_names));
   return 0;
 } /* process_selected_tables */
 
 
-static char *fix_table_name(char *dest, char *src)
+static uint fixed_name_length(const char *name)
 {
-  char *db_sep;
+  const char *p;
+  uint extra_length= 2;  /* count the first/last backticks */
+  
+  for (p= name; *p; p++)
+  {
+    if (*p == '`')
+      extra_length++;
+    else if (*p == '.')
+      extra_length+= 2;
+  }
+  return (p - name) + extra_length;
+}
+
 
+static char *fix_table_name(char *dest, char *src)
+{
   *dest++= '`';
-  if ((db_sep= strchr(src, '.')))
+  for (; *src; src++)
   {
-    dest= strmake(dest, src, (uint) (db_sep - src));
-    dest= strmov(dest, "`.`");
-    src= db_sep + 1;
+    switch (*src) {
+    case '.':            /* add backticks around '.' */
+      *dest++= '`';
+      *dest++= '.';
+      *dest++= '`';
+      break;
+    case '`':            /* escape backtick character */
+      *dest++= '`';
+      /* fall through */
+    default:
+      *dest++= *src;
+    }
   }
-  dest= strxmov(dest, src, "`", NullS);
+  *dest++= '`';
   return dest;
 }
 
@@ -471,7 +495,7 @@ static int process_all_tables_in_db(char *database)
   {
     /*
       We need table list in form `a`, `b`, `c`
-      that's why we need 4 more chars added to to each table name
+      that's why we need 2 more chars added to to each table name
       space is for more readable output in logs and in case of error
      */
 
@@ -479,7 +503,7 @@ static int process_all_tables_in_db(char *database)
     uint tot_length = 0;
 
     while ((row = mysql_fetch_row(res)))
-      tot_length += strlen(row[0]) + 4;
+      tot_length+= fixed_name_length(row[0]) + 2;
     mysql_data_seek(res, 0);
 
     if (!(tables=(char *) my_malloc(sizeof(char)*tot_length+4, MYF(MY_WME))))
@@ -507,7 +531,7 @@ static int process_all_tables_in_db(char *database)
       /* Skip tables with an engine of NULL (probably a view). */
       if (row[1])
       {
-        handle_request_for_tables(row[0], strlen(row[0]));
+        handle_request_for_tables(row[0], fixed_name_length(row[0]));
       }
   }
   mysql_free_result(res);
@@ -741,7 +765,7 @@ int main(int argc, char **argv)
     for (i = 0; i < tables4repair.elements ; i++)
     {
       char *name= (char*) dynamic_array_ptr(&tables4repair, i);
-      handle_request_for_tables(name, strlen(name));
+      handle_request_for_tables(name, fixed_name_length(name));
     }
   }
  end:

mysql-test/r/mysqlcheck.result

-DROP TABLE IF EXISTS t1;
+DROP TABLE IF EXISTS t1, `t``1`, `t 1`;
 drop view if exists v1;
 drop database if exists client_test_db;
 mysql.columns_priv                                 OK
@@ -41,4 +41,9 @@ test.t1                                            OK
 test.t1                                            OK
 drop view v1;
 drop table t1;
+create table `t``1`(a int);
+create table `t 1`(a int);
+test.t 1                                           OK
+test.t`1                                           OK
+drop table `t``1`, `t 1`;
 End of 5.0 tests

mysql-test/t/mysqlcheck.test

@@ -2,7 +2,7 @@
 #
 
 --disable_warnings
-DROP TABLE IF EXISTS t1;
+DROP TABLE IF EXISTS t1, `t``1`, `t 1`;
 drop view if exists v1;
 drop database if exists client_test_db;
 --enable_warnings
@@ -31,4 +31,13 @@ create view v1 as select * from t1;
 drop view v1;
 drop table t1;
 
+#
+# Bug #30654: mysqlcheck fails during upgrade of tables whose names include backticks
+#
+create table `t``1`(a int);
+create table `t 1`(a int);
+--replace_result 'Table is already up to date' OK
+--exec $MYSQL_CHECK --databases test
+drop table `t``1`, `t 1`;
+
 --echo End of 5.0 tests