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/*****************************************************************************
Copyright (c) 1996, 2015, Oracle and/or its affiliates. All Rights Reserved.
Copyright (c) 2017, 2019, MariaDB Corporation.
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
*****************************************************************************/
/**************************************************//**
@file data/data0type.cc
Data types
Created 1/16/1996 Heikki Tuuri
*******************************************************/
#include "dict0mem.h"
#include "my_sys.h"
/** The DB_TRX_ID,DB_ROLL_PTR values for "no history is available" */
const byte reset_trx_id[DATA_TRX_ID_LEN + DATA_ROLL_PTR_LEN] = {
0, 0, 0, 0, 0, 0,
0x80, 0, 0, 0, 0, 0, 0
};
/* At the database startup we store the default-charset collation number of
this MySQL installation to this global variable. If we have < 4.1.2 format
column definitions, or records in the insert buffer, we use this
charset-collation code for them. */
ulint data_mysql_default_charset_coll;
/*********************************************************************//**
Determine how many bytes the first n characters of the given string occupy.
If the string is shorter than n characters, returns the number of bytes
the characters in the string occupy.
@return length of the prefix, in bytes */
ulint
dtype_get_at_most_n_mbchars(
/*========================*/
ulint prtype, /*!< in: precise type */
ulint mbminlen, /*!< in: minimum length of
a multi-byte character, in bytes */
ulint mbmaxlen, /*!< in: maximum length of
a multi-byte character, in bytes */
ulint prefix_len, /*!< in: length of the requested
prefix, in characters, multiplied by
dtype_get_mbmaxlen(dtype) */
ulint data_len, /*!< in: length of str (in bytes) */
const char* str) /*!< in: the string whose prefix
length is being determined */
{
ut_a(len_is_stored(data_len));
ut_ad(!mbmaxlen || !(prefix_len % mbmaxlen));
if (mbminlen != mbmaxlen) {
ut_a(!(prefix_len % mbmaxlen));
return(innobase_get_at_most_n_mbchars(
dtype_get_charset_coll(prtype),
prefix_len, data_len, str));
}
if (prefix_len < data_len) {
return(prefix_len);
}
return(data_len);
}
/*********************************************************************//**
Validates a data type structure.
@return TRUE if ok */
ibool
dtype_validate(
/*===========*/
const dtype_t* type) /*!< in: type struct to validate */
{
ut_a(type);
ut_a(type->mtype >= DATA_VARCHAR);
ut_a(type->mtype <= DATA_MTYPE_MAX);
if (type->mtype == DATA_SYS) {
ut_a((type->prtype & DATA_MYSQL_TYPE_MASK) < DATA_N_SYS_COLS);
}
ut_a(dtype_get_mbminlen(type) <= dtype_get_mbmaxlen(type));
return(TRUE);
}
#ifdef UNIV_DEBUG
/** Print a data type structure.
@param[in] type data type */
void
dtype_print(const dtype_t* type)
{
ulint mtype;
ulint prtype;
ulint len;
ut_a(type);
mtype = type->mtype;
prtype = type->prtype;
switch (mtype) {
case DATA_VARCHAR:
fputs("DATA_VARCHAR", stderr);
break;
case DATA_CHAR:
fputs("DATA_CHAR", stderr);
break;
case DATA_BINARY:
fputs("DATA_BINARY", stderr);
break;
case DATA_FIXBINARY:
fputs("DATA_FIXBINARY", stderr);
break;
case DATA_BLOB:
fputs("DATA_BLOB", stderr);
break;
case DATA_GEOMETRY:
fputs("DATA_GEOMETRY", stderr);
break;
case DATA_INT:
fputs("DATA_INT", stderr);
break;
case DATA_MYSQL:
fputs("DATA_MYSQL", stderr);
break;
case DATA_SYS:
fputs("DATA_SYS", stderr);
break;
case DATA_FLOAT:
fputs("DATA_FLOAT", stderr);
break;
case DATA_DOUBLE:
fputs("DATA_DOUBLE", stderr);
break;
case DATA_DECIMAL:
fputs("DATA_DECIMAL", stderr);
break;
case DATA_VARMYSQL:
fputs("DATA_VARMYSQL", stderr);
break;
default:
fprintf(stderr, "type %lu", (ulong) mtype);
break;
}
len = type->len;
if ((type->mtype == DATA_SYS)
|| (type->mtype == DATA_VARCHAR)
|| (type->mtype == DATA_CHAR)) {
putc(' ', stderr);
if (prtype == DATA_ROW_ID) {
fputs("DATA_ROW_ID", stderr);
len = DATA_ROW_ID_LEN;
} else if (prtype == DATA_ROLL_PTR) {
fputs("DATA_ROLL_PTR", stderr);
len = DATA_ROLL_PTR_LEN;
} else if (prtype == DATA_TRX_ID) {
fputs("DATA_TRX_ID", stderr);
len = DATA_TRX_ID_LEN;
} else if (prtype == DATA_ENGLISH) {
fputs("DATA_ENGLISH", stderr);
} else {
fprintf(stderr, "prtype %lu", (ulong) prtype);
}
} else {
if (prtype & DATA_UNSIGNED) {
fputs(" DATA_UNSIGNED", stderr);
}
if (prtype & DATA_BINARY_TYPE) {
fputs(" DATA_BINARY_TYPE", stderr);
}
if (prtype & DATA_NOT_NULL) {
fputs(" DATA_NOT_NULL", stderr);
}
}
fprintf(stderr, " len %lu", (ulong) len);
}
#endif /* UNIV_DEBUG */
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