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1 <?php
2 //$Header: /home/dashley/cvsrep/e3ft_gpl01/e3ft_gpl01/webprojs/pamc/gen_a/sw/phplib/unique_id/sguid.inc,v 1.2 2007/06/24 19:40:01 dashley Exp $
3 //--------------------------------------------------------------------------------
4 //sguid.inc -- Server globally-unique identifiers.
5 //Copyright (C) 2007 David T. Ashley
6 //-------------------------------------------------------------------------------------------------
7 //This source code and any program in which it is compiled/used is provided under the GNU GENERAL
8 //PUBLIC LICENSE, Version 3, full license text below.
9 //-------------------------------------------------------------------------------------------------
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570 //combination as such.
571 //
572 // 14. Revised Versions of this License.
573 //
574 // The Free Software Foundation may publish revised and/or new versions of
575 //the GNU General Public License from time to time. Such new versions will
576 //be similar in spirit to the present version, but may differ in detail to
577 //address new problems or concerns.
578 //
579 // Each version is given a distinguishing version number. If the
580 //Program specifies that a certain numbered version of the GNU General
581 //Public License "or any later version" applies to it, you have the
582 //option of following the terms and conditions either of that numbered
583 //version or of any later version published by the Free Software
584 //Foundation. If the Program does not specify a version number of the
585 //GNU General Public License, you may choose any version ever published
586 //by the Free Software Foundation.
587 //
588 // If the Program specifies that a proxy can decide which future
589 //versions of the GNU General Public License can be used, that proxy's
590 //public statement of acceptance of a version permanently authorizes you
591 //to choose that version for the Program.
592 //
593 // Later license versions may give you additional or different
594 //permissions. However, no additional obligations are imposed on any
595 //author or copyright holder as a result of your choosing to follow a
596 //later version.
597 //
598 // 15. Disclaimer of Warranty.
599 //
608 //
609 // 16. Limitation of Liability.
610 //
620 //
621 // 17. Interpretation of Sections 15 and 16.
622 //
623 // If the disclaimer of warranty and limitation of liability provided
624 //above cannot be given local legal effect according to their terms,
625 //reviewing courts shall apply local law that most closely approximates
626 //an absolute waiver of all civil liability in connection with the
627 //Program, unless a warranty or assumption of liability accompanies a
628 //copy of the Program in return for a fee.
629 //
631 //
632 // How to Apply These Terms to Your New Programs
633 //
634 // If you develop a new program, and you want it to be of the greatest
635 //possible use to the public, the best way to achieve this is to make it
636 //free software which everyone can redistribute and change under these terms.
637 //
638 // To do so, attach the following notices to the program. It is safest
639 //to attach them to the start of each source file to most effectively
640 //state the exclusion of warranty; and each file should have at least
641 //the "copyright" line and a pointer to where the full notice is found.
642 //
643 // <one line to give the program's name and a brief idea of what it does.>
644 // Copyright (C) <year> <name of author>
645 //
646 // This program is free software: you can redistribute it and/or modify
647 // it under the terms of the GNU General Public License as published by
648 // the Free Software Foundation, either version 3 of the License, or
649 // (at your option) any later version.
650 //
651 // This program is distributed in the hope that it will be useful,
652 // but WITHOUT ANY WARRANTY; without even the implied warranty of
654 // GNU General Public License for more details.
655 //
656 // You should have received a copy of the GNU General Public License
657 // along with this program. If not, see <http://www.gnu.org/licenses/>.
658 //
659 //Also add information on how to contact you by electronic and paper mail.
660 //
661 // If the program does terminal interaction, make it output a short
662 //notice like this when it starts in an interactive mode:
663 //
664 // <program> Copyright (C) <year> <name of author>
665 // This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
666 // This is free software, and you are welcome to redistribute it
667 // under certain conditions; type `show c' for details.
668 //
669 //The hypothetical commands `show w' and `show c' should show the appropriate
670 //parts of the General Public License. Of course, your program's commands
671 //might be different; for a GUI interface, you would use an "about box".
672 //
673 // You should also get your employer (if you work as a programmer) or school,
674 //if any, to sign a "copyright disclaimer" for the program, if necessary.
675 //For more information on this, and how to apply and follow the GNU GPL, see
676 //<http://www.gnu.org/licenses/>.
677 //
678 // The GNU General Public License does not permit incorporating your program
679 //into proprietary programs. If your program is a subroutine library, you
680 //may consider it more useful to permit linking proprietary applications with
681 //the library. If this is what you want to do, use the GNU Lesser General
682 //Public License instead of this License. But first, please read
683 //<http://www.gnu.org/philosophy/why-not-lgpl.html>.
684 //-------------------------------------------------------------------------------------------------//--------------------------------------------------------------------------------
685 //This program is free software; you can redistribute it and/or
686 //modify it under the terms of the GNU General Public License
687 //as published by the Free Software Foundation; either version 2
688 //of the License, or (at your option) any later version.
689 //
690 //This program is distributed in the hope that it will be useful,
691 //but WITHOUT ANY WARRANTY; without even the implied warranty of
693 //GNU General Public License for more details.
694 //
695 //You should have received a copy of the GNU General Public License
696 //along with this program; if not, write to the Free Software
697 //Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
698 //--------------------------------------------------------------------------------
699 //Author contact information:
700 // David T. Ashley
701 // P.O. Box 918
702 // Marshall, Michigan, 49068
703 // dta@e3ft.com
704 //--------------------------------------------------------------------------------
705 require_once("string/strfunc_charset.inc");
706 require_once("time/timeraw.inc");
707 require_once("time/autime.inc");
708 //--------------------------------------------------------------------------------
709 //Returns an SGUID. Leap seconds situations are avoided.
710 //
711 //Unit-tested 20070624.
712 //
713 function SGUID_sguid()
714 {
715 //Get the reference timestamp.
716 $reftime = TIMERAW_time_precision_mixed_array_2_noleap();
718 //Get the PID. This may also chew up some time and hopefully let the
719 //server time change.
720 $pid = getmypid();
722 //Add the number of seconds between Jan 1, 1900 and Jan 1, 1970. This
723 //time is based from beginning of the century, whereas Unix time is
724 //based from the Unix epoch (Jan 1, 1970).
725 $reftime[0] = bcadd($reftime[0], "2208988800");
727 //Form the SGUID proper. Hopefully this will also chew up more time.
728 $reftime_whole = $reftime[0];
729 $reftime_frac = sprintf("%d", $reftime[1]);
730 $pid_string = sprintf("%d", $pid );
731 $rv = STRFUNC_pad_left_zero($reftime_whole, 10)
732 . STRFUNC_pad_left_zero($reftime_frac, 9)
733 . STRFUNC_pad_left_zero($pid_string, 10);
735 //Spin-lock until the time has changed. With any luck, the statements
736 //above have done that for us. It is hard to judge without some data
737 //whether microsleep would make things more efficient ... let's just leave
738 //it as a pure spin-lock.
739 do
740 {
741 $comptime = TIMERAW_time_precision_mixed_array_2_noleap();
742 }
743 while (($reftime[1] == $comptime[1]) && ($reftime[0] == $comptime[0]));
745 //Return the value to the caller.
746 return($rv);
747 }
748 //
749 //
750 //--------------------------------------------------------------------------------
751 //Returns the length of a SGUID (in characters).
752 //
753 //Unit-tested 20070624.
754 //
755 function SGUID_sguid_len()
756 {
757 return(29);
758 }
759 //
760 //
761 //--------------------------------------------------------------------------------
762 //Returns 1 if the SGUID is syntactically valid or 0 otherwise.
763 //
764 //Unit-tested 20070624.
765 //
766 function SGUID_is_syntactically_valid($sguid_to_check)
767 {
768 //Must be a string data type.
769 if (! is_string($sguid_to_check))
770 return(0);
772 //Must be of appropriate length.
773 if (strlen($sguid_to_check) != 29)
774 return(0);
776 //The string must be digits only.
777 if (! STRFUNC_is_pure_digits($sguid_to_check))
778 return(0);
780 //If we're here, nothing obvious wrong with it.
781 return(1);
782 }
783 //--------------------------------------------------------------------------------
784 //End of $RCSfile: sguid.inc,v $.
785 //--------------------------------------------------------------------------------
786 ?>

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