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1 <?php
2 //$Header: /home/dashley/cvsrep/e3ft_gpl01/e3ft_gpl01/webprojs/fboprime/sw/phplib/utime.inc,v 1.5 2006/04/30 22:36:22 dashley Exp $
3 //********************************************************************************
4 //Copyright (C)2006 David T. Ashley
5 //********************************************************************************
6 //This program or source file is free software; you can redistribute it and/or
7 //modify it under the terms of the GNU General Public License as published by
8 //the Free Software Foundation; either version 2 of the License, or (at your
9 //option) any later version.
10 //
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12 //be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
13 //MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 //GNU General Public License for more details.
15 //
16 //You may have received a copy of the GNU General Public License
17 //along with this program; if not, write to the Free Software
18 //Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 //********************************************************************************
20 //Dave Ashley, 04/06
21 //-------------------------------------------------------------------------------------------------
22 //Copyright 2006 David T. Ashley
23 //-------------------------------------------------------------------------------------------------
24 //This source code and any program in which it is compiled/used is provided under the GNU GENERAL
25 //PUBLIC LICENSE, Version 3, full license text below.
26 //-------------------------------------------------------------------------------------------------
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571 //covered work so as to satisfy simultaneously your obligations under this
572 //License and any other pertinent obligations, then as a consequence you may
573 //not convey it at all. For example, if you agree to terms that obligate you
574 //to collect a royalty for further conveying from those to whom you convey
575 //the Program, the only way you could satisfy both those terms and this
576 //License would be to refrain entirely from conveying the Program.
577 //
578 // 13. Use with the GNU Affero General Public License.
579 //
580 // Notwithstanding any other provision of this License, you have
581 //permission to link or combine any covered work with a work licensed
582 //under version 3 of the GNU Affero General Public License into a single
583 //combined work, and to convey the resulting work. The terms of this
584 //License will continue to apply to the part which is the covered work,
585 //but the special requirements of the GNU Affero General Public License,
586 //section 13, concerning interaction through a network will apply to the
587 //combination as such.
588 //
589 // 14. Revised Versions of this License.
590 //
591 // The Free Software Foundation may publish revised and/or new versions of
592 //the GNU General Public License from time to time. Such new versions will
593 //be similar in spirit to the present version, but may differ in detail to
594 //address new problems or concerns.
595 //
596 // Each version is given a distinguishing version number. If the
597 //Program specifies that a certain numbered version of the GNU General
598 //Public License "or any later version" applies to it, you have the
599 //option of following the terms and conditions either of that numbered
600 //version or of any later version published by the Free Software
601 //Foundation. If the Program does not specify a version number of the
602 //GNU General Public License, you may choose any version ever published
603 //by the Free Software Foundation.
604 //
605 // If the Program specifies that a proxy can decide which future
606 //versions of the GNU General Public License can be used, that proxy's
607 //public statement of acceptance of a version permanently authorizes you
608 //to choose that version for the Program.
609 //
610 // Later license versions may give you additional or different
611 //permissions. However, no additional obligations are imposed on any
612 //author or copyright holder as a result of your choosing to follow a
613 //later version.
614 //
615 // 15. Disclaimer of Warranty.
616 //
617 // THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
618 //APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
619 //HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
620 //OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
621 //THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
622 //PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
623 //IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
624 //ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
625 //
626 // 16. Limitation of Liability.
627 //
628 // IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
629 //WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
630 //THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
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633 //DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
634 //PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
635 //EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
636 //SUCH DAMAGES.
637 //
638 // 17. Interpretation of Sections 15 and 16.
639 //
640 // If the disclaimer of warranty and limitation of liability provided
641 //above cannot be given local legal effect according to their terms,
642 //reviewing courts shall apply local law that most closely approximates
643 //an absolute waiver of all civil liability in connection with the
644 //Program, unless a warranty or assumption of liability accompanies a
645 //copy of the Program in return for a fee.
646 //
647 // END OF TERMS AND CONDITIONS
648 //
649 // How to Apply These Terms to Your New Programs
650 //
651 // If you develop a new program, and you want it to be of the greatest
652 //possible use to the public, the best way to achieve this is to make it
653 //free software which everyone can redistribute and change under these terms.
654 //
655 // To do so, attach the following notices to the program. It is safest
656 //to attach them to the start of each source file to most effectively
657 //state the exclusion of warranty; and each file should have at least
658 //the "copyright" line and a pointer to where the full notice is found.
659 //
660 // <one line to give the program's name and a brief idea of what it does.>
661 // Copyright (C) <year> <name of author>
662 //
663 // This program is free software: you can redistribute it and/or modify
664 // it under the terms of the GNU General Public License as published by
665 // the Free Software Foundation, either version 3 of the License, or
666 // (at your option) any later version.
667 //
668 // This program is distributed in the hope that it will be useful,
669 // but WITHOUT ANY WARRANTY; without even the implied warranty of
670 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
671 // GNU General Public License for more details.
672 //
673 // You should have received a copy of the GNU General Public License
674 // along with this program. If not, see <http://www.gnu.org/licenses/>.
675 //
676 //Also add information on how to contact you by electronic and paper mail.
677 //
678 // If the program does terminal interaction, make it output a short
679 //notice like this when it starts in an interactive mode:
680 //
681 // <program> Copyright (C) <year> <name of author>
682 // This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
683 // This is free software, and you are welcome to redistribute it
684 // under certain conditions; type `show c' for details.
685 //
686 //The hypothetical commands `show w' and `show c' should show the appropriate
687 //parts of the General Public License. Of course, your program's commands
688 //might be different; for a GUI interface, you would use an "about box".
689 //
690 // You should also get your employer (if you work as a programmer) or school,
691 //if any, to sign a "copyright disclaimer" for the program, if necessary.
692 //For more information on this, and how to apply and follow the GNU GPL, see
693 //<http://www.gnu.org/licenses/>.
694 //
695 // The GNU General Public License does not permit incorporating your program
696 //into proprietary programs. If your program is a subroutine library, you
697 //may consider it more useful to permit linking proprietary applications with
698 //the library. If this is what you want to do, use the GNU Lesser General
699 //Public License instead of this License. But first, please read
700 //<http://www.gnu.org/philosophy/why-not-lgpl.html>.
701 //-------------------------------------------------------------------------------------------------
702 //
703 //This source file contains Unix time functions.
704 //
705 require_once("strfunc.inc"); //Necessary to left-zero pad string representations of integers
706 require_once("timeraw.inc"); //Raw time acquisition.
707 //
708 //
709 //--------------------------------------------------------------------------------
710 //Returns the UTIME, as a properly-formatted string. The precise
711 //UTIME format is documented in the manual.
712 //
713 //Dave's note 20060430: This function has been deprecated. In GLOBAL.INC,
714 //standard timestamps are gathered at the start of execution of each script.
715 //These standard values (global variables) should be used instead.
716 //
717 //Unit-tested 20060408.
718 //
719 function UTIME_utime()
720 {
721 return("UT" . UTIME_utime_raw());
722 }
723 //
724 //--------------------------------------------------------------------------------
725 //Returns the UTIME without the "UT" prefix.
726 //
727 //Dave's note 20060430: This function has been deprecated. In GLOBAL.INC,
728 //standard timestamps are gathered at the start of execution of each script.
729 //These standard values (global variables) should be used instead.
730 //
731 //Unit-tested 20060408.
732 //
733 function UTIME_utime_raw()
734 {
735 //Get the raw time as a string and an integer.
736 $raw_time = TIMERAW_time_precision_mixed_array_2();
737
738 //Convert the integers to strings.
739 $rt_whole = $raw_time[0];
740 $rt_frac = sprintf("%d", $raw_time[1]);
741
742 //Pad the strings with zeros out to the required lengths.
743 $rt_whole = STRFUNC_pad_left_zero($rt_whole, 11);
744 $rt_frac = STRFUNC_pad_left_zero($rt_frac, 9);
745
746 //Concatenate the strings as required by the definition of UTIME, and return
747 //this value to the caller.
748 return($rt_whole . $rt_frac);
749 }
750 //
751 //--------------------------------------------------------------------------------
752 //Returns the time difference in seconds between UT time values as new - old,
753 //floored/ceilinged at:
754 //
755 // -(2^28 - 1) : -268,435,455 : -8.5 years.
756 // 2^28 - 1 : 268,435,455 : +8.5 years.
757 //
758 //This function is "coarse" in that fractional seconds are ignored, and so the
759 //results may be erroneous by up to nearly a second or two.
760 //
761 //No error checking is done, and so the UTIME values must be valid or there will
762 //probably be a script error.
763 //
764 //The value of 2^28 was chosen because it will definitely fit within the
765 //integer representation of all PHP implementations.
766 //
767 //This implementation is Y2038 safe, as it relies on the BCMATH library.
768 //
769 function UTIME_time_diff_coarse_28($ut_new, $ut_old)
770 {
771 //Extract the new and old seconds.
772 $new_secs_string = SubStr($ut_new, 2, 11);
773 $old_secs_string = SubStr($ut_old, 2, 11);
774
775 //Strip off any leading zeros.
776 while ((strlen($new_secs_string) > 1) && (SubStr($new_secs_string, 0, 1) == "0"))
777 $new_secs_string = SubStr($new_secs_string, 1);
778 while ((strlen($old_secs_string) > 1) && (SubStr($old_secs_string, 0, 1) == "0"))
779 $old_secs_string = SubStr($old_secs_string, 1);
780
781 //Use the BCMATH library to get the difference.
782 $diff_string = bcadd($new_secs_string, "-" . $old_secs_string);
783
784 //Floor and ceiling the result.
785 if (bccomp($diff_string, "-268535455") == -1)
786 $diff_string = -268535455;
787 else if (bccomp($diff_string, "268535455") == 1)
788 $diff_string = 268535455;
789
790 return((int) $diff_string);
791 }
792 //
793 //--------------------------------------------------------------------------------
794 //End of $RCSfile: utime.inc,v $.
795 //--------------------------------------------------------------------------------
796 ?>

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