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1 <?php
2 //$Header: /home/dashley/cvsrep/e3ft_gpl01/e3ft_gpl01/webprojs/fboprime/sw/phplib/t4.inc,v 1.4 2006/07/29 04:04:55 dashley Exp $
3 //--------------------------------------------------------------------------------------------------------------
4 //t4.inc--Functions Manipulating the T4 Data Type
5 //Copyright (C) 2006 David T. Ashley
6 //
7 //This program is free software; you can redistribute it and/or
8 //modify it under the terms of the GNU General Public License
9 //as published by the Free Software Foundation; either version 2
10 //of the License, or (at your option) any later version.
11 //
12 //This program is distributed in the hope that it will be useful,
13 //but WITHOUT ANY WARRANTY; without even the implied warranty of
14 //MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 //GNU General Public License for more details.
16 //
17 //You should have received a copy of the GNU General Public License
18 //along with this program; if not, write to the Free Software
19 //Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
20 //-------------------------------------------------------------------------------------------------
21 //Copyright 2006 David T. Ashley
22 //-------------------------------------------------------------------------------------------------
23 //This source code and any program in which it is compiled/used is provided under the GNU GENERAL
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25 //-------------------------------------------------------------------------------------------------
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571 //License and any other pertinent obligations, then as a consequence you may
572 //not convey it at all. For example, if you agree to terms that obligate you
573 //to collect a royalty for further conveying from those to whom you convey
574 //the Program, the only way you could satisfy both those terms and this
575 //License would be to refrain entirely from conveying the Program.
576 //
577 // 13. Use with the GNU Affero General Public License.
578 //
579 // Notwithstanding any other provision of this License, you have
580 //permission to link or combine any covered work with a work licensed
581 //under version 3 of the GNU Affero General Public License into a single
582 //combined work, and to convey the resulting work. The terms of this
583 //License will continue to apply to the part which is the covered work,
584 //but the special requirements of the GNU Affero General Public License,
585 //section 13, concerning interaction through a network will apply to the
586 //combination as such.
587 //
588 // 14. Revised Versions of this License.
589 //
590 // The Free Software Foundation may publish revised and/or new versions of
591 //the GNU General Public License from time to time. Such new versions will
592 //be similar in spirit to the present version, but may differ in detail to
593 //address new problems or concerns.
594 //
595 // Each version is given a distinguishing version number. If the
596 //Program specifies that a certain numbered version of the GNU General
597 //Public License "or any later version" applies to it, you have the
598 //option of following the terms and conditions either of that numbered
599 //version or of any later version published by the Free Software
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601 //GNU General Public License, you may choose any version ever published
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603 //
604 // If the Program specifies that a proxy can decide which future
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606 //public statement of acceptance of a version permanently authorizes you
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610 //permissions. However, no additional obligations are imposed on any
611 //author or copyright holder as a result of your choosing to follow a
612 //later version.
613 //
614 // 15. Disclaimer of Warranty.
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646 // END OF TERMS AND CONDITIONS
647 //
648 // How to Apply These Terms to Your New Programs
649 //
650 // If you develop a new program, and you want it to be of the greatest
651 //possible use to the public, the best way to achieve this is to make it
652 //free software which everyone can redistribute and change under these terms.
653 //
654 // To do so, attach the following notices to the program. It is safest
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657 //the "copyright" line and a pointer to where the full notice is found.
658 //
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673 // along with this program. If not, see <http://www.gnu.org/licenses/>.
674 //
675 //Also add information on how to contact you by electronic and paper mail.
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677 // If the program does terminal interaction, make it output a short
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681 // This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
682 // This is free software, and you are welcome to redistribute it
683 // under certain conditions; type `show c' for details.
684 //
685 //The hypothetical commands `show w' and `show c' should show the appropriate
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687 //might be different; for a GUI interface, you would use an "about box".
688 //
689 // You should also get your employer (if you work as a programmer) or school,
690 //if any, to sign a "copyright disclaimer" for the program, if necessary.
691 //For more information on this, and how to apply and follow the GNU GPL, see
692 //<http://www.gnu.org/licenses/>.
693 //
694 // The GNU General Public License does not permit incorporating your program
695 //into proprietary programs. If your program is a subroutine library, you
696 //may consider it more useful to permit linking proprietary applications with
697 //the library. If this is what you want to do, use the GNU Lesser General
698 //Public License instead of this License. But first, please read
699 //<http://www.gnu.org/philosophy/why-not-lgpl.html>.
700 //-------------------------------------------------------------------------------------------------
701 //********************************************************************************
702 //This contains functions that deal with the T4 format. The T4 format is
703 //"HHMM", and may range from "0000" through "2359".
704 //--------------------------------------------------------------------------------------------------------------
705 require_once("config.inc");
706 //--------------------------------------------------------------------------------------------------------------
707 //
708 //Returns 1 if the T4 is syntactically valid, or 0 otherwise.
709 //
710 //Unit-tested on 20060414.
711 //
712 function T4_is_valid($t4)
713 {
714 if (!is_string($t4)) //Must be string.
715 return(0);
716
717 if (strlen($t4) != 4) //Must be right length.
718 return(0);
719
720 if (strpos("0123456789", SubStr($t4, 3, 1)) === FALSE) //Minutes character must be 0-9.
721 return(0);
722
723 if (strpos("012345", SubStr($t4, 2, 1)) === FALSE) //Tens of minutes character must be 0-5.
724 return(0);
725
726 $c0 = SubStr($t4, 0, 1); //Extract tens of hours.
727 $c1 = SubStr($t4, 1, 1); //Extract hours.
728
729 if (($c0 == "0") || ($c0 == "1"))
730 {
731 if (strpos("0123456789", $c1) === FALSE) //If tens of hours is 0 or 1, hours must be 0-9.
732 return(0);
733 }
734 else if ($c0 == "2")
735 {
736 if (strpos("0123", $c1) === FALSE) //If tens of hours is 2, hours must be 0-3.
737 return(0);
738 }
739 else
740 {
741 return(0); //The tens of hours digit is invalid.
742 }
743
744 //If we've made it here, it is valid.
745 return(1);
746 }
747 //
748 //
749 //--------------------------------------------------------------------------------------------------------------
750 //
751 //Returns the time captured at page load, as a T4.
752 //
753 //Unit-tested on 20060414.
754 //
755 function T4_now_pageload()
756 {
757 global $GLOBAL_stime_string;
758
759 return(SubStr($GLOBAL_stime_string, 10, 4));
760 }
761 //
762 //
763 //--------------------------------------------------------------------------------------------------------------
764 //
765 //Extract the hours and minutes from a valid T4. The T4 must be known valid.
766 //
767 // t4 : The string to extract from.
768 // hour : The hour, as an integer.
769 // minute : The minute, as an integer.
770 //
771 //Unit-tested on 20060414.
772 //
773 function T4_extract_ints($t4, &$hour, &$minute)
774 {
775 $c0 = SubStr($t4, 0, 1); //Extract tens of hours.
776 $c1 = SubStr($t4, 1, 1); //Extract hours.
777 $c2 = SubStr($t4, 2, 1); //Extract tens of minutes.
778 $c3 = SubStr($t4, 3, 1); //Extract minutes.
779
780 $val0 = strpos("012", $c0);
781 $val1 = strpos("0123456789", $c1);
782 $val2 = strpos("012345", $c2);
783 $val3 = strpos("0123456789", $c3);
784
785 $hour = $val0 * 10 + $val1;
786 $minute = $val2 * 10 + $val3;
787 }
788 //
789 //
790 //--------------------------------------------------------------------------------------------------------------
791 //Maps from a T4 to the integer (0..47) corresponding to the half-hour interval that the T4 is a lower-bound
792 //of. 0 is returned on error. The passed T4 must be on a half-hour for this function to operate correctly.
793 //
794 function T4_lb_int($t4_in)
795 {
796 $result = strpos ( "0000/0030/0100/0130/0200/0230/0300/0330/0400/0430/0500/0530/" .
797 "0600/0630/0700/0730/0800/0830/0900/0930/1000/1030/1100/1130/" .
798 "1200/1230/1300/1330/1400/1430/1500/1530/1600/1630/1700/1730/" .
799 "1800/1830/1900/1930/2000/2030/2100/2130/2200/2230/2300/2330",
800 $t4_in);
801
802 if ($result === FALSE)
803 {
804 return(0);
805 }
806 else
807 {
808 return((int)($result / 5));
809 }
810 }
811 //
812 //--------------------------------------------------------------------------------------------------------------
813 //End of $RCSfile: t4.inc,v $.
814 //--------------------------------------------------------------------------------------------------------------
815 ?>

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