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<?php
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//$Header: /hl/cvsroots/gpl01/gpl01/webprojs/fboprime/sw/phplib/utime.inc,v 1.5 2006/04/30 22:36:22 dashley Exp $
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//********************************************************************************
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//Copyright (C)2006 David T. Ashley
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//********************************************************************************
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//This program or source file is free software; you can redistribute it and/or
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//modify it under the terms of the GNU General Public License as published by
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//the Free Software Foundation; either version 2 of the License, or (at your
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//option) any later version.
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//
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//This program or source file is distributed in the hope that it will
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//be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
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//MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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//GNU General Public License for more details.
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//
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//You may have received a copy of the GNU General Public License
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//along with this program; if not, write to the Free Software
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//Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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//********************************************************************************
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//Dave Ashley, 04/06
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//
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//This source file contains Unix time functions.
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//
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require_once("strfunc.inc"); //Necessary to left-zero pad string representations of integers
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require_once("timeraw.inc"); //Raw time acquisition.
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//
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//
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//--------------------------------------------------------------------------------
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//Returns the UTIME, as a properly-formatted string. The precise
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//UTIME format is documented in the manual.
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//
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//Dave's note 20060430: This function has been deprecated. In GLOBAL.INC,
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//standard timestamps are gathered at the start of execution of each script.
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//These standard values (global variables) should be used instead.
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//
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//Unit-tested 20060408.
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//
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function UTIME_utime()
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{
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return("UT" . UTIME_utime_raw());
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}
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//
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//--------------------------------------------------------------------------------
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//Returns the UTIME without the "UT" prefix.
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//
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//Dave's note 20060430: This function has been deprecated. In GLOBAL.INC,
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//standard timestamps are gathered at the start of execution of each script.
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//These standard values (global variables) should be used instead.
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//
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//Unit-tested 20060408.
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//
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function UTIME_utime_raw()
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{
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//Get the raw time as a string and an integer.
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$raw_time = TIMERAW_time_precision_mixed_array_2();
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//Convert the integers to strings.
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$rt_whole = $raw_time[0];
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$rt_frac = sprintf("%d", $raw_time[1]);
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//Pad the strings with zeros out to the required lengths.
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$rt_whole = STRFUNC_pad_left_zero($rt_whole, 11);
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$rt_frac = STRFUNC_pad_left_zero($rt_frac, 9);
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//Concatenate the strings as required by the definition of UTIME, and return
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//this value to the caller.
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return($rt_whole . $rt_frac);
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}
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//
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//--------------------------------------------------------------------------------
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//Returns the time difference in seconds between UT time values as new - old,
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//floored/ceilinged at:
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//
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// -(2^28 - 1) : -268,435,455 : -8.5 years.
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// 2^28 - 1 : 268,435,455 : +8.5 years.
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//
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//This function is "coarse" in that fractional seconds are ignored, and so the
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//results may be erroneous by up to nearly a second or two.
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//
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//No error checking is done, and so the UTIME values must be valid or there will
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//probably be a script error.
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//
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//The value of 2^28 was chosen because it will definitely fit within the
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//integer representation of all PHP implementations.
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//
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//This implementation is Y2038 safe, as it relies on the BCMATH library.
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//
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function UTIME_time_diff_coarse_28($ut_new, $ut_old)
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{
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//Extract the new and old seconds.
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$new_secs_string = SubStr($ut_new, 2, 11);
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$old_secs_string = SubStr($ut_old, 2, 11);
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//Strip off any leading zeros.
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while ((strlen($new_secs_string) > 1) && (SubStr($new_secs_string, 0, 1) == "0"))
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$new_secs_string = SubStr($new_secs_string, 1);
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while ((strlen($old_secs_string) > 1) && (SubStr($old_secs_string, 0, 1) == "0"))
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$old_secs_string = SubStr($old_secs_string, 1);
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//Use the BCMATH library to get the difference.
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$diff_string = bcadd($new_secs_string, "-" . $old_secs_string);
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//Floor and ceiling the result.
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if (bccomp($diff_string, "-268535455") == -1)
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$diff_string = -268535455;
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else if (bccomp($diff_string, "268535455") == 1)
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$diff_string = 268535455;
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return((int) $diff_string);
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}
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//
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//--------------------------------------------------------------------------------
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//End of $RCSfile: utime.inc,v $.
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//--------------------------------------------------------------------------------
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?>
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