/******************************************************
Data types

(c) 1996 Innobase Oy

Created 1/16/1996 Heikki Tuuri
*******************************************************/

#include "data0type.h"

#ifdef UNIV_NONINL
#include "data0type.ic"
#endif

/* 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		= 99999999;
ulint	data_mysql_latin1_swedish_charset_coll	= 99999999;

dtype_t		dtype_binary_val = {DATA_BINARY, 0, 0, 0};
dtype_t* 	dtype_binary 	= &dtype_binary_val;

/*************************************************************************
Checks if a data main type is a string type. Also a BLOB is considered a
string type. */

ibool
dtype_is_string_type(
/*=================*/
			/* out: TRUE if string type */
	ulint	mtype)	/* in: InnoDB main data type code: DATA_CHAR, ... */
{
 	if (mtype <= DATA_BLOB
	    || mtype == DATA_MYSQL
	    || mtype == DATA_VARMYSQL) {

		return(TRUE);
	}

	return(FALSE);
}

/*************************************************************************
Checks if a type is a binary string type. Note that for tables created with
< 4.0.14, we do not know if a DATA_BLOB column is a BLOB or a TEXT column. For
those DATA_BLOB columns this function currently returns FALSE. */

ibool
dtype_is_binary_string_type(
/*========================*/
			/* out: TRUE if binary string type */
	ulint	mtype,	/* in: main data type */
	ulint	prtype)	/* in: precise type */
{
        if ((mtype == DATA_FIXBINARY)
	    || (mtype == DATA_BINARY)
	    || (mtype == DATA_BLOB && (prtype & DATA_BINARY_TYPE))) {

		return(TRUE);
	}

	return(FALSE);
}

/*************************************************************************
Checks if a type is a non-binary string type. That is, dtype_is_string_type is
TRUE and dtype_is_binary_string_type is FALSE. Note that for tables created
with < 4.0.14, we do not know if a DATA_BLOB column is a BLOB or a TEXT column.
For those DATA_BLOB columns this function currently returns TRUE. */

ibool
dtype_is_non_binary_string_type(
/*============================*/
			/* out: TRUE if non-binary string type */
	ulint	mtype,	/* in: main data type */
	ulint	prtype)	/* in: precise type */
{
	if (dtype_is_string_type(mtype) == TRUE
	    && dtype_is_binary_string_type(mtype, prtype) == FALSE) {
		
		return(TRUE);
	}

	return(FALSE);
}

/*************************************************************************
Forms a precise type from the < 4.1.2 format precise type plus the
charset-collation code. */

ulint
dtype_form_prtype(
/*==============*/
	ulint	old_prtype,	/* in: the MySQL type code and the flags
				DATA_BINARY_TYPE etc. */
	ulint	charset_coll)	/* in: MySQL charset-collation code */
{
	ut_a(old_prtype < 256 * 256);
	ut_a(charset_coll < 256);

	return(old_prtype + (charset_coll << 16));
}

/*************************************************************************
Validates a data type structure. */

ibool
dtype_validate(
/*===========*/
				/* out: TRUE if ok */
	dtype_t*	type)	/* in: type struct to validate */
{
	ut_a(type);
	ut_a((type->mtype >= DATA_VARCHAR) && (type->mtype <= DATA_MYSQL));
	
	if (type->mtype == DATA_SYS) {
		ut_a(type->prtype <= DATA_MIX_ID);
	}

	return(TRUE);
}

/*************************************************************************
Prints a data type structure. */

void
dtype_print(
/*========*/
	dtype_t*	type)	/* in: type */
{
	ulint	mtype;
	ulint	prtype;
	ulint	len;
	
	ut_a(type);

	mtype = type->mtype;
	prtype = type->prtype;
	if (mtype == DATA_VARCHAR) {
		fputs("DATA_VARCHAR", stderr);
	} else if (mtype == DATA_CHAR) {
		fputs("DATA_CHAR", stderr);
	} else if (mtype == DATA_BINARY) {
		fputs("DATA_BINARY", stderr);
	} else if (mtype == DATA_INT) {
		fputs("DATA_INT", stderr);
	} else if (mtype == DATA_MYSQL) {
		fputs("DATA_MYSQL", stderr);
	} else if (mtype == DATA_SYS) {
		fputs("DATA_SYS", stderr);
	} else {
		fprintf(stderr, "type %lu", (ulong) mtype);
	}

	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_MIX_ID) {
			fputs("DATA_MIX_ID", stderr);
		} else if (prtype == DATA_ENGLISH) {
			fputs("DATA_ENGLISH", stderr);
		} else {
			fprintf(stderr, "prtype %lu", (ulong) mtype);
		}
	}

	fprintf(stderr, " len %lu prec %lu", (ulong) len, (ulong) type->prec);
}