Merge mysql.com:/home/mydev/mysql-4.1

into mysql.com:/home/mydev/mysql-4.1-4100

include/my_global.h

@@ -530,7 +530,11 @@ typedef SOCKET_SIZE_TYPE size_socket;
 #define FN_LEN		256	/* Max file name len */
 #define FN_HEADLEN	253	/* Max length of filepart of file name */
 #define FN_EXTLEN	20	/* Max length of extension (part of FN_LEN) */
+#ifdef PATH_MAX
+#define FN_REFLEN       PATH_MAX/* Max length of full path-name */
+#else
 #define FN_REFLEN	512	/* Max length of full path-name */
+#endif
 #define FN_EXTCHAR	'.'
 #define FN_HOMELIB	'~'	/* ~/ is used as abbrev for home dir */
 #define FN_CURLIB	'.'	/* ./ is used as abbrev for current dir */

sql/item_timefunc.cc

@@ -2115,7 +2115,6 @@ String *Item_char_typecast::val_str(String *str)
   String *res;
   uint32 length;
 
-#if 0
   if (!charset_conversion)
   {
     if (!(res= args[0]->val_str(str)))
@@ -2125,7 +2124,6 @@ String *Item_char_typecast::val_str(String *str)
     }
   }
   else
-#endif
   {
     // Convert character set if differ
     uint dummy_errors;
@@ -2163,7 +2161,16 @@ String *Item_char_typecast::val_str(String *str)
 void Item_char_typecast::fix_length_and_dec()
 {
   uint32 char_length;
-  charset_conversion= !my_charset_same(args[0]->collation.collation, cast_cs) &&
+  /* 
+     We always force character set conversion if cast_cs
+     is a multi-byte character set. It garantees that the
+     result of CAST is a well-formed string.
+     For single-byte character sets we allow just to copy
+     from the argument. A single-byte character sets string
+     is always well-formed. 
+  */
+  charset_conversion= (cast_cs->mbmaxlen > 1) ||
+                      !my_charset_same(args[0]->collation.collation, cast_cs) &&
                       args[0]->collation.collation != &my_charset_bin &&
                       cast_cs != &my_charset_bin;
   collation.set(cast_cs, DERIVATION_IMPLICIT);

sql/mysql_priv.h

@@ -852,7 +852,7 @@ extern Gt_creator gt_creator;
 extern Lt_creator lt_creator;
 extern Ge_creator ge_creator;
 extern Le_creator le_creator;
-extern char language[LIBLEN],reg_ext[FN_EXTLEN];
+extern char language[FN_REFLEN], reg_ext[FN_EXTLEN];
 extern char glob_hostname[FN_REFLEN], mysql_home[FN_REFLEN];
 extern char pidfile_name[FN_REFLEN], system_time_zone[30], *opt_init_file;
 extern char log_error_file[FN_REFLEN];

sql/mysqld.cc

@@ -340,7 +340,7 @@ char *default_tz_name;
 char log_error_file[FN_REFLEN], glob_hostname[FN_REFLEN];
 char* log_error_file_ptr= log_error_file;
 char mysql_real_data_home[FN_REFLEN],
-     language[LIBLEN],reg_ext[FN_EXTLEN], mysql_charsets_dir[FN_REFLEN],
+     language[FN_REFLEN], reg_ext[FN_EXTLEN], mysql_charsets_dir[FN_REFLEN],
      *mysqld_user,*mysqld_chroot, *opt_init_file,
      *opt_init_connect, *opt_init_slave,
      def_ft_boolean_syntax[sizeof(ft_boolean_syntax)];