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mariadb/sql/sql_error.cc
Oleksandr Byelkin a7d880f0b0 MDEV-21916: COM_STMT_BULK_EXECUTE with RETURNING insert wrong values 
The problem is that array binding uses net buffer to read parameters for each
execution while each execiting with RETURNING write in the same buffer.

Solution is to allocate new net buffer to avoid changing buffer we are reading
from.
2021-07-15 16:28:13 +02:00

1012 lines
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/* Copyright (c) 1995, 2011, Oracle and/or its affiliates. All rights reserved.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA */
/**********************************************************************
This file contains the implementation of error and warnings related
- Whenever an error or warning occurred, it pushes it to a warning list
that the user can retrieve with SHOW WARNINGS or SHOW ERRORS.
- For each statement, we return the number of warnings generated from this
command. Note that this can be different from @@warning_count as
we reset the warning list only for questions that uses a table.
This is done to allow on to do:
INSERT ...;
SELECT @@warning_count;
SHOW WARNINGS;
(If we would reset after each command, we could not retrieve the number
of warnings)
- When client requests the information using SHOW command, then
server processes from this list and returns back in the form of
resultset.
Supported syntaxes:
SHOW [COUNT(*)] ERRORS [LIMIT [offset,] rows]
SHOW [COUNT(*)] WARNINGS [LIMIT [offset,] rows]
SELECT @@warning_count, @@error_count;
***********************************************************************/
#include "mariadb.h"
#include "sql_priv.h"
#include "unireg.h"
#include "sql_error.h"
#include "sp_rcontext.h"
/*
Design notes about Sql_condition::m_message_text.
The member Sql_condition::m_message_text contains the text associated with
an error, warning or note (which are all SQL 'conditions')
Producer of Sql_condition::m_message_text:
----------------------------------------
(#1) the server implementation itself, when invoking functions like
my_error() or push_warning()
(#2) user code in stored programs, when using the SIGNAL statement.
(#3) user code in stored programs, when using the RESIGNAL statement.
When invoking my_error(), the error number and message is typically
provided like this:
- my_error(ER_WRONG_DB_NAME, MYF(0), ...);
- my_message(ER_SLAVE_IGNORED_TABLE, ER(ER_SLAVE_IGNORED_TABLE), MYF(0));
In both cases, the message is retrieved from ER(ER_XXX), which in turn
is read from the resource file errmsg.sys at server startup.
The strings stored in the errmsg.sys file are expressed in the character set
that corresponds to the server --language start option
(see error_message_charset_info).
When executing:
- a SIGNAL statement,
- a RESIGNAL statement,
the message text is provided by the user logic, and is expressed in UTF8.
Storage of Sql_condition::m_message_text:
---------------------------------------
(#4) The class Sql_condition is used to hold the message text member.
This class represents a single SQL condition.
(#5) The class Warning_info represents a SQL condition area, and contains
a collection of SQL conditions in the Warning_info::m_warn_list
Consumer of Sql_condition::m_message_text:
----------------------------------------
(#6) The statements SHOW WARNINGS and SHOW ERRORS display the content of
the warning list.
(#7) The GET DIAGNOSTICS statement (planned, not implemented yet) will
also read the content of:
- the top level statement condition area (when executed in a query),
- a sub statement (when executed in a stored program)
and return the data stored in a Sql_condition.
(#8) The RESIGNAL statement reads the Sql_condition caught by an exception
handler, to raise a new or modified condition (in #3).
The big picture
---------------
--------------
| ^
V |
my_error(#1) SIGNAL(#2) RESIGNAL(#3) |
|(#A) |(#B) |(#C) |
| | | |
----------------------------|---------------------------- |
| |
V |
Sql_condition(#4) |
| |
| |
V |
Warning_info(#5) |
| |
----------------------------------------------------- |
| | | |
| | | |
| | | |
V V V |
SHOW WARNINGS(#6) GET DIAGNOSTICS(#7) RESIGNAL(#8) |
| | | | |
| -------- | V |
| | | --------------
V | |
Connectors | |
| | |
-------------------------
|
V
Client application
Current implementation status
-----------------------------
(#1) (my_error) produces data in the 'error_message_charset_info' CHARSET
(#2) and (#3) (SIGNAL, RESIGNAL) produces data internally in UTF8
(#6) (SHOW WARNINGS) produces data in the 'error_message_charset_info' CHARSET
(#7) (GET DIAGNOSTICS) is not implemented.
(#8) (RESIGNAL) produces data internally in UTF8 (see #3)
As a result, the design choice for (#4) and (#5) is to store data in
the 'error_message_charset_info' CHARSET, to minimize impact on the code base.
This is implemented by using 'String Sql_condition::m_message_text'.
The UTF8 -> error_message_charset_info conversion is implemented in
Sql_cmd_common_signal::eval_signal_informations() (for path #B and #C).
Future work
-----------
- Change (#1) (my_error) to generate errors in UTF8.
See WL#751 (Recoding of error messages)
- Change (#4 and #5) to store message text in UTF8 natively.
In practice, this means changing the type of the message text to
'<UTF8 String 128 class> Sql_condition::m_message_text', and is a direct
consequence of WL#751.
- Implement (#9) (GET DIAGNOSTICS).
See WL#2111 (Stored Procedures: Implement GET DIAGNOSTICS)
*/
static void copy_string(MEM_ROOT *mem_root, String* dst, const String* src)
{
size_t len= src->length();
if (len)
{
char* copy= (char*) alloc_root(mem_root, len + 1);
if (copy)
{
memcpy(copy, src->ptr(), len);
copy[len]= '\0';
dst->set(copy, len, src->charset());
}
}
else
dst->length(0);
}
void
Sql_condition::copy_opt_attributes(const Sql_condition *cond)
{
DBUG_ASSERT(this != cond);
copy_string(m_mem_root, & m_class_origin, & cond->m_class_origin);
copy_string(m_mem_root, & m_subclass_origin, & cond->m_subclass_origin);
copy_string(m_mem_root, & m_constraint_catalog, & cond->m_constraint_catalog);
copy_string(m_mem_root, & m_constraint_schema, & cond->m_constraint_schema);
copy_string(m_mem_root, & m_constraint_name, & cond->m_constraint_name);
copy_string(m_mem_root, & m_catalog_name, & cond->m_catalog_name);
copy_string(m_mem_root, & m_schema_name, & cond->m_schema_name);
copy_string(m_mem_root, & m_table_name, & cond->m_table_name);
copy_string(m_mem_root, & m_column_name, & cond->m_column_name);
copy_string(m_mem_root, & m_cursor_name, & cond->m_cursor_name);
}
void
Sql_condition::set_builtin_message_text(const char* str)
{
/*
See the comments
"Design notes about Sql_condition::m_message_text."
*/
const char* copy;
copy= strdup_root(m_mem_root, str);
m_message_text.set(copy, strlen(copy), error_message_charset_info);
DBUG_ASSERT(! m_message_text.is_alloced());
}
const char*
Sql_condition::get_message_text() const
{
return m_message_text.ptr();
}
int
Sql_condition::get_message_octet_length() const
{
return m_message_text.length();
}
void Sql_state_errno_level::assign_defaults(const Sql_state_errno *from)
{
DBUG_ASSERT(from);
int sqlerrno= from->get_sql_errno();
/*
SIGNAL is restricted in sql_yacc.yy to only signal SQLSTATE conditions.
*/
DBUG_ASSERT(from->has_sql_state());
set_sqlstate(from);
/* SQLSTATE class "00": illegal, rejected in the parser. */
DBUG_ASSERT(m_sqlstate[0] != '0' || get_sqlstate()[1] != '0');
if (Sql_state::is_warning()) /* SQLSTATE class "01": warning. */
{
m_level= Sql_condition::WARN_LEVEL_WARN;
m_sql_errno= sqlerrno ? sqlerrno : ER_SIGNAL_WARN;
}
else if (Sql_state::is_not_found()) /* SQLSTATE class "02": not found. */
{
m_level= Sql_condition::WARN_LEVEL_ERROR;
m_sql_errno= sqlerrno ? sqlerrno : ER_SIGNAL_NOT_FOUND;
}
else /* other SQLSTATE classes : error. */
{
m_level= Sql_condition::WARN_LEVEL_ERROR;
m_sql_errno= sqlerrno ? sqlerrno : ER_SIGNAL_EXCEPTION;
}
}
void Sql_condition::assign_defaults(THD *thd, const Sql_state_errno *from)
{
if (from)
Sql_state_errno_level::assign_defaults(from);
if (!get_message_text())
set_builtin_message_text(ER(get_sql_errno()));
}
Diagnostics_area::Diagnostics_area(bool initialize)
: is_bulk_execution(0), m_main_wi(0, false, initialize)
{
push_warning_info(&m_main_wi);
reset_diagnostics_area();
}
Diagnostics_area::Diagnostics_area(ulonglong warning_info_id,
bool allow_unlimited_warnings,
bool initialize)
: is_bulk_execution(0),
m_main_wi(warning_info_id, allow_unlimited_warnings, initialize)
{
push_warning_info(&m_main_wi);
reset_diagnostics_area();
}
/**
Clear this diagnostics area.
Normally called at the end of a statement.
*/
void
Diagnostics_area::reset_diagnostics_area()
{
DBUG_ENTER("reset_diagnostics_area");
m_skip_flush= FALSE;
#ifdef DBUG_OFF
m_can_overwrite_status= FALSE;
/** Don't take chances in production */
m_message[0]= '\0';
Sql_state_errno::clear();
Sql_user_condition_identity::clear();
m_affected_rows= 0;
m_last_insert_id= 0;
m_statement_warn_count= 0;
#endif
get_warning_info()->clear_error_condition();
set_is_sent(false);
/** Tiny reset in debug mode to see garbage right away */
m_status= DA_EMPTY;
DBUG_VOID_RETURN;
}
/**
Set OK status -- ends commands that do not return a
result set, e.g. INSERT/UPDATE/DELETE.
*/
void
Diagnostics_area::set_ok_status(ulonglong affected_rows,
ulonglong last_insert_id,
const char *message)
{
DBUG_ENTER("set_ok_status");
DBUG_ASSERT(!is_set() || (m_status == DA_OK_BULK && is_bulk_op()));
/*
In production, refuse to overwrite an error or a custom response
with an OK packet.
*/
if (unlikely(is_error() || is_disabled()))
return;
/*
When running a bulk operation, m_status will be DA_OK for the first
operation and set to DA_OK_BULK for all following operations.
*/
if (m_status == DA_OK_BULK)
{
m_statement_warn_count+= current_statement_warn_count();
m_affected_rows+= affected_rows;
}
else
{
m_statement_warn_count= current_statement_warn_count();
m_affected_rows= affected_rows;
m_status= (is_bulk_op() ? DA_OK_BULK : DA_OK);
}
m_last_insert_id= last_insert_id;
if (message)
strmake_buf(m_message, message);
else
m_message[0]= '\0';
DBUG_VOID_RETURN;
}
/**
Set EOF status.
*/
void
Diagnostics_area::set_eof_status(THD *thd)
{
DBUG_ENTER("set_eof_status");
/* Only allowed to report eof if has not yet reported an error */
DBUG_ASSERT(!is_set() || (m_status == DA_EOF_BULK && is_bulk_op()));
/*
In production, refuse to overwrite an error or a custom response
with an EOF packet.
*/
if (unlikely(is_error() || is_disabled()))
return;
/*
If inside a stored procedure, do not return the total
number of warnings, since they are not available to the client
anyway.
*/
if (m_status == DA_EOF_BULK)
{
if (!thd->spcont)
m_statement_warn_count+= current_statement_warn_count();
}
else
{
if (thd->spcont)
{
m_statement_warn_count= 0;
m_affected_rows= 0;
}
else
m_statement_warn_count= current_statement_warn_count();
m_status= (is_bulk_op() ? DA_EOF_BULK : DA_EOF);
}
DBUG_VOID_RETURN;
}
/**
Set ERROR status in the Diagnostics Area. This function should be used to
report fatal errors (such as out-of-memory errors) when no further
processing is possible.
@param sql_errno SQL-condition error number
*/
void
Diagnostics_area::set_error_status(uint sql_errno)
{
set_error_status(sql_errno,
ER(sql_errno),
mysql_errno_to_sqlstate(sql_errno),
Sql_user_condition_identity(),
NULL);
}
/**
Set ERROR status in the Diagnostics Area.
@note error_condition may be NULL. It happens if a) OOM error is being
reported; or b) when Warning_info is full.
@param sql_errno SQL-condition error number
@param message SQL-condition message
@param sqlstate SQL-condition state
@param ucid User defined condition identity
@param error_condition SQL-condition object representing the error state
@note Note, that error_condition may be NULL. It happens if a) OOM error is
being reported; or b) when Warning_info is full.
*/
void
Diagnostics_area::set_error_status(uint sql_errno,
const char *message,
const char *sqlstate,
const Sql_user_condition_identity &ucid,
const Sql_condition *error_condition)
{
DBUG_ENTER("set_error_status");
DBUG_PRINT("enter", ("error: %d", sql_errno));
/*
Only allowed to report error if has not yet reported a success
The only exception is when we flush the message to the client,
an error can happen during the flush.
*/
DBUG_ASSERT(! is_set() || m_can_overwrite_status);
// message must be set properly by the caller.
DBUG_ASSERT(message);
// sqlstate must be set properly by the caller.
DBUG_ASSERT(sqlstate);
#ifdef DBUG_OFF
/*
In production, refuse to overwrite a custom response with an
ERROR packet.
*/
if (is_disabled())
return;
#endif
Sql_state_errno::set(sql_errno, sqlstate);
Sql_user_condition_identity::set(ucid);
strmake_buf(m_message, message);
get_warning_info()->set_error_condition(error_condition);
m_status= DA_ERROR;
DBUG_VOID_RETURN;
}
/**
Mark the diagnostics area as 'DISABLED'.
This is used in rare cases when the COM_ command at hand sends a response
in a custom format. One example is the query cache, another is
COM_STMT_PREPARE.
*/
void
Diagnostics_area::disable_status()
{
DBUG_ENTER("disable_status");
DBUG_ASSERT(! is_set());
m_status= DA_DISABLED;
DBUG_VOID_RETURN;
}
Warning_info::Warning_info(ulonglong warn_id_arg,
bool allow_unlimited_warnings, bool initialize)
:m_current_statement_warn_count(0),
m_current_row_for_warning(1),
m_warn_id(warn_id_arg),
m_error_condition(NULL),
m_allow_unlimited_warnings(allow_unlimited_warnings),
initialized(0),
m_read_only(FALSE)
{
m_warn_list.empty();
memset(m_warn_count, 0, sizeof(m_warn_count));
if (initialize)
init();
}
void Warning_info::init()
{
/* Initialize sub structures */
DBUG_ASSERT(initialized == 0);
init_sql_alloc(PSI_INSTRUMENT_ME, &m_warn_root, WARN_ALLOC_BLOCK_SIZE,
WARN_ALLOC_PREALLOC_SIZE, MYF(MY_THREAD_SPECIFIC));
initialized= 1;
}
void Warning_info::free_memory()
{
if (initialized)
free_root(&m_warn_root,MYF(0));
}
Warning_info::~Warning_info()
{
free_memory();
}
bool Warning_info::has_sql_condition(const char *message_str, size_t message_length) const
{
Diagnostics_area::Sql_condition_iterator it(m_warn_list);
const Sql_condition *err;
while ((err= it++))
{
if (strncmp(message_str, err->get_message_text(), message_length) == 0)
return true;
}
return false;
}
void Warning_info::clear(ulonglong new_id)
{
id(new_id);
m_warn_list.empty();
m_marked_sql_conditions.empty();
free_memory();
memset(m_warn_count, 0, sizeof(m_warn_count));
m_current_statement_warn_count= 0;
m_current_row_for_warning= 1; /* Start counting from the first row */
clear_error_condition();
}
void Warning_info::append_warning_info(THD *thd, const Warning_info *source)
{
const Sql_condition *err;
Diagnostics_area::Sql_condition_iterator it(source->m_warn_list);
const Sql_condition *src_error_condition = source->get_error_condition();
while ((err= it++))
{
// Do not use ::push_warning() to avoid invocation of THD-internal-handlers.
Sql_condition *new_error= Warning_info::push_warning(thd, err);
if (src_error_condition && src_error_condition == err)
set_error_condition(new_error);
if (source->is_marked_for_removal(err))
mark_condition_for_removal(new_error);
}
}
/**
Copy Sql_conditions that are not WARN_LEVEL_ERROR from the source
Warning_info to the current Warning_info.
@param thd Thread context.
@param sp_wi Stored-program Warning_info
@param thd Thread context.
@param src_wi Warning_info to copy from.
*/
void Diagnostics_area::copy_non_errors_from_wi(THD *thd,
const Warning_info *src_wi)
{
Sql_condition_iterator it(src_wi->m_warn_list);
const Sql_condition *cond;
Warning_info *wi= get_warning_info();
while ((cond= it++))
{
if (cond->get_level() == Sql_condition::WARN_LEVEL_ERROR)
continue;
Sql_condition *new_condition= wi->push_warning(thd, cond);
if (src_wi->is_marked_for_removal(cond))
wi->mark_condition_for_removal(new_condition);
}
}
void Warning_info::mark_sql_conditions_for_removal()
{
Sql_condition_list::Iterator it(m_warn_list);
Sql_condition *cond;
while ((cond= it++))
mark_condition_for_removal(cond);
}
void Warning_info::remove_marked_sql_conditions()
{
List_iterator_fast<Sql_condition> it(m_marked_sql_conditions);
Sql_condition *cond;
while ((cond= it++))
{
m_warn_list.remove(cond);
m_warn_count[cond->get_level()]--;
m_current_statement_warn_count--;
if (cond == m_error_condition)
m_error_condition= NULL;
}
m_marked_sql_conditions.empty();
}
bool Warning_info::is_marked_for_removal(const Sql_condition *cond) const
{
List_iterator_fast<Sql_condition> it(
const_cast<List<Sql_condition>&> (m_marked_sql_conditions));
Sql_condition *c;
while ((c= it++))
{
if (c == cond)
return true;
}
return false;
}
void Warning_info::reserve_space(THD *thd, uint count)
{
while (m_warn_list.elements() &&
(m_warn_list.elements() + count) > thd->variables.max_error_count)
m_warn_list.remove(m_warn_list.front());
}
Sql_condition *Warning_info::push_warning(THD *thd,
const Sql_condition_identity *value,
const char *msg)
{
Sql_condition *cond= NULL;
if (! m_read_only)
{
if (m_allow_unlimited_warnings ||
m_warn_list.elements() < thd->variables.max_error_count)
{
cond= new (& m_warn_root) Sql_condition(& m_warn_root, *value, msg);
if (cond)
m_warn_list.push_back(cond);
}
m_warn_count[(uint) value->get_level()]++;
}
m_current_statement_warn_count++;
return cond;
}
Sql_condition *Warning_info::push_warning(THD *thd,
const Sql_condition *sql_condition)
{
Sql_condition *new_condition= push_warning(thd, sql_condition,
sql_condition->get_message_text());
if (new_condition)
new_condition->copy_opt_attributes(sql_condition);
return new_condition;
}
/*
Push the warning to error list if there is still room in the list
SYNOPSIS
push_warning()
thd Thread handle
level Severity of warning (note, warning)
code Error number
msg Clear error message
*/
void push_warning(THD *thd, Sql_condition::enum_warning_level level,
uint code, const char *msg)
{
DBUG_ENTER("push_warning");
DBUG_PRINT("enter", ("code: %d, msg: %s", code, msg));
/*
Calling push_warning/push_warning_printf with a level of
WARN_LEVEL_ERROR *is* a bug. Either use my_printf_error(),
my_error(), or WARN_LEVEL_WARN.
*/
DBUG_ASSERT(level != Sql_condition::WARN_LEVEL_ERROR);
if (level == Sql_condition::WARN_LEVEL_ERROR)
level= Sql_condition::WARN_LEVEL_WARN;
(void) thd->raise_condition(code, NULL, level, msg);
/* Make sure we also count warnings pushed after calling set_ok_status(). */
thd->get_stmt_da()->increment_warning();
DBUG_VOID_RETURN;
}
/*
Push the warning to error list if there is still room in the list
SYNOPSIS
push_warning_printf()
thd Thread handle
level Severity of warning (note, warning)
code Error number
msg Clear error message
*/
void push_warning_printf(THD *thd, Sql_condition::enum_warning_level level,
uint code, const char *format, ...)
{
va_list args;
char warning[MYSQL_ERRMSG_SIZE];
DBUG_ENTER("push_warning_printf");
DBUG_PRINT("enter",("warning: %u", code));
DBUG_ASSERT(code != 0);
DBUG_ASSERT(format != NULL);
va_start(args,format);
my_vsnprintf_ex(&my_charset_utf8mb3_general_ci, warning,
sizeof(warning), format, args);
va_end(args);
push_warning(thd, level, code, warning);
DBUG_VOID_RETURN;
}
/*
Send all notes, errors or warnings to the client in a result set
SYNOPSIS
mysqld_show_warnings()
thd Thread handler
levels_to_show Bitmap for which levels to show
DESCRIPTION
Takes into account the current LIMIT
RETURN VALUES
FALSE ok
TRUE Error sending data to client
*/
const LEX_CSTRING warning_level_names[]=
{
{ STRING_WITH_LEN("Note") },
{ STRING_WITH_LEN("Warning") },
{ STRING_WITH_LEN("Error") },
{ STRING_WITH_LEN("?") }
};
bool mysqld_show_warnings(THD *thd, ulong levels_to_show)
{
List<Item> field_list;
MEM_ROOT *mem_root= thd->mem_root;
const Sql_condition *err;
SELECT_LEX *sel= thd->lex->first_select_lex();
SELECT_LEX_UNIT *unit= &thd->lex->unit;
ha_rows idx;
Protocol *protocol=thd->protocol;
DBUG_ENTER("mysqld_show_warnings");
DBUG_ASSERT(thd->get_stmt_da()->is_warning_info_read_only());
field_list.push_back(new (mem_root)
Item_empty_string(thd, "Level", 7),
mem_root);
field_list.push_back(new (mem_root)
Item_return_int(thd, "Code", 4, MYSQL_TYPE_LONG),
mem_root);
field_list.push_back(new (mem_root)
Item_empty_string(thd, "Message", MYSQL_ERRMSG_SIZE),
mem_root);
if (protocol->send_result_set_metadata(&field_list,
Protocol::SEND_NUM_ROWS |
Protocol::SEND_EOF))
DBUG_RETURN(TRUE);
unit->set_limit(sel);
Diagnostics_area::Sql_condition_iterator it=
thd->get_stmt_da()->sql_conditions();
for (idx= 0; (err= it++) ; idx++)
{
/* Skip levels that the user is not interested in */
if (!(levels_to_show & ((ulong) 1 << err->get_level())))
continue;
if (unit->lim.check_offset(idx))
continue; // using limit offset,count
if (idx >= unit->lim.get_select_limit())
break;
protocol->prepare_for_resend();
protocol->store(warning_level_names[err->get_level()].str,
warning_level_names[err->get_level()].length,
system_charset_info);
protocol->store((uint32) err->get_sql_errno());
protocol->store_warning(err->get_message_text(),
err->get_message_octet_length());
if (protocol->write())
DBUG_RETURN(TRUE);
}
my_eof(thd);
thd->get_stmt_da()->set_warning_info_read_only(FALSE);
DBUG_RETURN(FALSE);
}
/**
This replaces U+0000 to '\0000', so the result error message string:
- is a good null-terminated string
- presents the entire data
For example:
SELECT CAST(_latin1 0x610062 AS SIGNED);
returns a warning:
Truncated incorrect INTEGER value: 'a\0000b'
Notice, the 0x00 byte is replaced to a 5-byte long string '\0000',
while 'a' and 'b' are printed as is.
*/
extern "C" int my_wc_mb_utf8_null_terminated(CHARSET_INFO *cs,
my_wc_t wc, uchar *r, uchar *e)
{
return wc == '\0' ?
cs->wc_to_printable(wc, r, e) :
my_charset_utf8mb3_handler.wc_mb(cs, wc, r, e);
}
/**
Convert value for dispatch to error message(see WL#751).
@param to buffer for converted string
@param to_length size of the buffer
@param from string which should be converted
@param from_length string length
@param from_cs charset from convert
@retval
result string
*/
char *err_conv(char *buff, uint to_length, const char *from,
uint from_length, CHARSET_INFO *from_cs)
{
char *to= buff;
const char *from_start= from;
size_t res;
DBUG_ASSERT(to_length > 0);
to_length--;
if (from_cs == &my_charset_bin)
{
uchar char_code;
res= 0;
while (1)
{
if ((uint)(from - from_start) >= from_length ||
res >= to_length)
{
*to= 0;
break;
}
char_code= ((uchar) *from);
if (char_code >= 0x20 && char_code <= 0x7E)
{
*to++= char_code;
from++;
res++;
}
else
{
if (res + 4 >= to_length)
{
*to= 0;
break;
}
res+= my_snprintf(to, 5, "\\x%02X", (uint) char_code);
to+=4;
from++;
}
}
}
else
{
uint errors;
res= my_convert_using_func(to, to_length, system_charset_info,
my_wc_mb_utf8_null_terminated,
from, from_length, from_cs,
from_cs->cset->mb_wc,
&errors);
to[res]= 0;
}
return buff;
}
/**
Convert string for dispatch to client(see WL#751).
@param to buffer to convert
@param to_length buffer length
@param to_cs chraset to convert
@param from string from convert
@param from_length string length
@param from_cs charset from convert
@param errors count of errors during convertion
@retval
length of converted string
*/
size_t convert_error_message(char *to, size_t to_length, CHARSET_INFO *to_cs,
const char *from, size_t from_length,
CHARSET_INFO *from_cs, uint *errors)
{
DBUG_ASSERT(to_length > 0);
/* Make room for the null terminator. */
to_length--;
if (!to_cs || to_cs == &my_charset_bin)
to_cs= system_charset_info;
uint32 cnv_length= my_convert_using_func(to, to_length,
to_cs,
to_cs->cset->wc_to_printable,
from, from_length,
from_cs, from_cs->cset->mb_wc,
errors);
DBUG_ASSERT(to_length >= cnv_length);
to[cnv_length]= '\0';
return cnv_length;
}
/**
Sanity check for SQLSTATEs. The function does not check if it's really an
existing SQL-state (there are just too many), it just checks string length and
looks for bad characters.
@param sqlstate the condition SQLSTATE.
@retval true if it's ok.
@retval false if it's bad.
*/
bool is_sqlstate_valid(const LEX_CSTRING *sqlstate)
{
if (sqlstate->length != 5)
return false;
for (int i= 0 ; i < 5 ; ++i)
{
char c = sqlstate->str[i];
if ((c < '0' || '9' < c) &&
(c < 'A' || 'Z' < c))
return false;
}
return true;
}
void convert_error_to_warning(THD *thd)
{
DBUG_ASSERT(thd->is_error());
push_warning(thd, Sql_condition::WARN_LEVEL_WARN,
thd->get_stmt_da()->sql_errno(),
thd->get_stmt_da()->message());
thd->clear_error();
}
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