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/*****************************************************************************
Copyright (c) 1994, 2009, Innobase Oy. 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 St, Fifth Floor, Boston, MA 02110-1301 USA
*****************************************************************************/
/**************************************************************//**
@file include/ut0ut.ic
Various utilities
Created 5/30/1994 Heikki Tuuri
*******************************************************************/
/******************************************************//**
Calculates the minimum of two ulints.
@return minimum */
UNIV_INLINE
ulint
ut_min(
/*===*/
ulint n1, /*!< in: first number */
ulint n2) /*!< in: second number */
{
return((n1 <= n2) ? n1 : n2);
}
/******************************************************//**
Calculates the maximum of two ulints.
@return maximum */
UNIV_INLINE
ulint
ut_max(
/*===*/
ulint n1, /*!< in: first number */
ulint n2) /*!< in: second number */
{
return((n1 <= n2) ? n2 : n1);
}
/****************************************************************//**
Calculates minimum of two ulint-pairs. */
UNIV_INLINE
void
ut_pair_min(
/*========*/
ulint* a, /*!< out: more significant part of minimum */
ulint* b, /*!< out: less significant part of minimum */
ulint a1, /*!< in: more significant part of first pair */
ulint b1, /*!< in: less significant part of first pair */
ulint a2, /*!< in: more significant part of second pair */
ulint b2) /*!< in: less significant part of second pair */
{
if (a1 == a2) {
*a = a1;
*b = ut_min(b1, b2);
} else if (a1 < a2) {
*a = a1;
*b = b1;
} else {
*a = a2;
*b = b2;
}
}
/******************************************************//**
Compares two ulints.
@return 1 if a > b, 0 if a == b, -1 if a < b */
UNIV_INLINE
int
ut_ulint_cmp(
/*=========*/
ulint a, /*!< in: ulint */
ulint b) /*!< in: ulint */
{
if (a < b) {
return(-1);
} else if (a == b) {
return(0);
} else {
return(1);
}
}
/*******************************************************//**
Compares two pairs of ulints.
@return -1 if a < b, 0 if a == b, 1 if a > b */
UNIV_INLINE
int
ut_pair_cmp(
/*========*/
ulint a1, /*!< in: more significant part of first pair */
ulint a2, /*!< in: less significant part of first pair */
ulint b1, /*!< in: more significant part of second pair */
ulint b2) /*!< in: less significant part of second pair */
{
if (a1 > b1) {
return(1);
} else if (a1 < b1) {
return(-1);
} else if (a2 > b2) {
return(1);
} else if (a2 < b2) {
return(-1);
} else {
return(0);
}
}
/*************************************************************//**
Calculates fast the 2-logarithm of a number, rounded upward to an
integer.
@return logarithm in the base 2, rounded upward */
UNIV_INLINE
ulint
ut_2_log(
/*=====*/
ulint n) /*!< in: number != 0 */
{
ulint res;
res = 0;
ut_ad(n > 0);
n = n - 1;
for (;;) {
n = n / 2;
if (n == 0) {
break;
}
res++;
}
return(res + 1);
}
/*************************************************************//**
Calculates 2 to power n.
@return 2 to power n */
UNIV_INLINE
ulint
ut_2_exp(
/*=====*/
ulint n) /*!< in: number */
{
return((ulint) 1 << n);
}
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