Bug#32430: 'show innodb status' causes errors

Invalid (old?) table or database name in logs

Post push patch.

Bug was that a non partitioned table file was not
converted to system_charset, (due to table_name_len was not set).

Also missing DBUG_RETURN.

And Innodb adds quotes after calling the function,
so I added one more mode where explain_filename does not
add quotes. But it still appends the [sub]partition name
as a comment.

Also caught a minor quoting bug, the character '`' was
not quoted in the identifier. (so 'a`b' was quoted as `a`b`
and not `a``b`, this is mulitbyte characters aware.)

sql/mysql_priv.h:
  Bug#32430: 'show innodb status' causes errors
  Invalid (old?) table or database name in logs
  
  Added an unquoted mode
sql/share/errmsg.txt:
  Bug#32430: 'show innodb status' causes errors
  Invalid (old?) table or database name in logs
  
  Removed the quoting of identifier, only leaving the translated word.
sql/sql_table.cc:
  Bug#32430: 'show innodb status' causes errors
  Invalid (old?) table or database name in logs
  
  Fixed quoting of '`'
  Added DBUG_RETURN.
  Corrected table_name_len.
  Added unquoted mode.

sql/mysql_priv.h

@@ -2261,7 +2261,8 @@ enum enum_explain_filename_mode
 {
   EXPLAIN_ALL_VERBOSE= 0,
   EXPLAIN_PARTITIONS_VERBOSE,
-  EXPLAIN_PARTITIONS_AS_COMMENT
+  EXPLAIN_PARTITIONS_AS_COMMENT,
+  EXPLAIN_PARTITIONS_AS_COMMENT_NO_QUOTING
 };
 uint explain_filename(const char *from, char *to, uint to_length,
                       enum_explain_filename_mode explain_mode);

sql/share/errmsg.txt

@@ -6184,17 +6184,17 @@ ER_FUNC_INEXISTENT_NAME_COLLISION 42000
 # When updating these, please update EXPLAIN_FILENAME_MAX_EXTRA_LENGTH in
 # mysql_priv.h with the new maximal additional length for explain_filename.
 ER_DATABASE_NAME
-  eng "Database `%s`"
-  swe "Databas `%s`"
+  eng "Database"
+  swe "Databas"
 ER_TABLE_NAME
-  eng "Table `%s`"
-  swe "Tabell `%s`"
+  eng "Table"
+  swe "Tabell"
 ER_PARTITION_NAME
-  eng "Partition `%s`"
-  swe "Partition `%s`"
+  eng "Partition"
+  swe "Partition"
 ER_SUBPARTITION_NAME
-  eng "Subpartition `%s`"
-  swe "Subpartition `%s`"
+  eng "Subpartition"
+  swe "Subpartition"
 ER_TEMPORARY_NAME
   eng "Temporary"
   swe "Temporr"

sql/sql_table.cc

@@ -72,7 +72,7 @@ static void wait_for_kill_signal(THD *thd)
   @brief Helper function for explain_filename
 */
 static char* add_identifier(char *to_p, const char * end_p,
-                           const char* name, uint name_len, int errcode)
+                           const char* name, uint name_len, bool add_quotes)
 {
   uint res;
   uint errors;
@@ -92,18 +92,44 @@ static char* add_identifier(char *to_p, const char * end_p,
   res= strconvert(&my_charset_filename, conv_name, system_charset_info,
                   conv_string, FN_REFLEN, &errors);
   if (!res || errors)
+  {
+    DBUG_PRINT("error", ("strconvert of '%s' failed with %u (errors: %u)", conv_name, res, errors));
     conv_name= name;
+  }
   else
   {
     DBUG_PRINT("info", ("conv '%s' -> '%s'", conv_name, conv_string));
     conv_name= conv_string;
   }
 
-  if (errcode)
-    to_p+= my_snprintf(to_p, end_p - to_p, ER(errcode), conv_name);
+  if (add_quotes && (end_p - to_p > 2))
+  {
+    *(to_p++)= '`';
+    while (*conv_name && (end_p - to_p - 1) > 0)
+    {
+      uint length= my_mbcharlen(system_charset_info, *conv_name);
+      if (!length)
+        length= 1;
+      if (length == 1 && *conv_name == '`')
+      { 
+        if ((end_p - to_p) < 3)
+          break;
+        *(to_p++)= '`';
+        *(to_p++)= *(conv_name++);
+      }
+      else if (length < (end_p - to_p))
+      {
+        to_p= strnmov(to_p, conv_name, length);
+        conv_name+= length;
+      }
       else
-    to_p+= my_snprintf(to_p, end_p - to_p, "`%s`", conv_name);
-  return to_p;
+        break;                               /* string already filled */
+    }
+    to_p= strnmov(to_p, "`", end_p - to_p);
+  }
+  else
+    to_p= strnmov(to_p, conv_name, end_p - to_p);
+  DBUG_RETURN(to_p);
 }
 
 
@@ -135,6 +161,8 @@ static char* add_identifier(char *to_p, const char * end_p,
                             [,[ Temporary| Renamed] Partition `p`
                             [, Subpartition `sp`]] *|
                             (| is really a /, and it is all in one line)
+                            EXPLAIN_PARTITIONS_AS_COMMENT_NO_QUOTING ->
+                            same as above but no quotes are added.
 
    @retval     Length of returned string
 */
@@ -245,28 +273,39 @@ uint explain_filename(const char *from,
         part_name_len-= 5;
     }
   }
+  else
+    table_name_len= strlen(table_name);
   if (db_name)
   {
     if (explain_mode == EXPLAIN_ALL_VERBOSE)
     {
-      to_p= add_identifier(to_p, end_p, db_name, db_name_len,
-                           ER_DATABASE_NAME);
+      to_p= strnmov(to_p, ER(ER_DATABASE_NAME), end_p - to_p);
+      *(to_p++)= ' ';
+      to_p= add_identifier(to_p, end_p, db_name, db_name_len, 1);
       to_p= strnmov(to_p, ", ", end_p - to_p);
     }
     else
     {
-      to_p= add_identifier(to_p, end_p, db_name, db_name_len, 0);
+      to_p= add_identifier(to_p, end_p, db_name, db_name_len,
+                           (explain_mode !=
+                            EXPLAIN_PARTITIONS_AS_COMMENT_NO_QUOTING));
       to_p= strnmov(to_p, ".", end_p - to_p);
     }
   }
   if (explain_mode == EXPLAIN_ALL_VERBOSE)
-    to_p= add_identifier(to_p, end_p, table_name, table_name_len,
-                         ER_TABLE_NAME);
+  {
+    to_p= strnmov(to_p, ER(ER_TABLE_NAME), end_p - to_p);
+    *(to_p++)= ' ';
+    to_p= add_identifier(to_p, end_p, table_name, table_name_len, 1);
+  }
   else
-    to_p= add_identifier(to_p, end_p, table_name, table_name_len, 0);
+    to_p= add_identifier(to_p, end_p, table_name, table_name_len,
+                         (explain_mode !=
+                          EXPLAIN_PARTITIONS_AS_COMMENT_NO_QUOTING));
   if (part_name)
   {
-    if (explain_mode == EXPLAIN_PARTITIONS_AS_COMMENT)
+    if (explain_mode == EXPLAIN_PARTITIONS_AS_COMMENT ||
+        explain_mode == EXPLAIN_PARTITIONS_AS_COMMENT_NO_QUOTING)
       to_p= strnmov(to_p, " /* ", end_p - to_p);
     else if (explain_mode == EXPLAIN_PARTITIONS_VERBOSE)
       to_p= strnmov(to_p, " ", end_p - to_p);
@@ -280,15 +319,22 @@ uint explain_filename(const char *from,
         to_p= strnmov(to_p, ER(ER_RENAMED_NAME), end_p - to_p);
       to_p= strnmov(to_p, " ", end_p - to_p);
     }
+    to_p= strnmov(to_p, ER(ER_PARTITION_NAME), end_p - to_p);
+    *(to_p++)= ' ';
     to_p= add_identifier(to_p, end_p, part_name, part_name_len,
-                         ER_PARTITION_NAME);
+                         (explain_mode !=
+                          EXPLAIN_PARTITIONS_AS_COMMENT_NO_QUOTING));
     if (subpart_name)
     {
       to_p= strnmov(to_p, ", ", end_p - to_p);
+      to_p= strnmov(to_p, ER(ER_SUBPARTITION_NAME), end_p - to_p);
+      *(to_p++)= ' ';
       to_p= add_identifier(to_p, end_p, subpart_name, subpart_name_len,
-                           ER_SUBPARTITION_NAME);
+                           (explain_mode !=
+                            EXPLAIN_PARTITIONS_AS_COMMENT_NO_QUOTING));
     }
-    if (explain_mode == EXPLAIN_PARTITIONS_AS_COMMENT)
+    if (explain_mode == EXPLAIN_PARTITIONS_AS_COMMENT ||
+        explain_mode == EXPLAIN_PARTITIONS_AS_COMMENT_NO_QUOTING)
       to_p= strnmov(to_p, " */", end_p - to_p);
   }
   DBUG_PRINT("exit", ("to '%s'", to));