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1 dashley 25 /* $Header: /cvsroot/esrg/sfesrg/esrgpcpj/shared/tclxtens/credits.c,v 1.5 2001/08/16 12:20:09 dtashley Exp $ */
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4     //Copyright 2001 David T. Ashley
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683     //-------------------------------------------------------------------------------------------------
684     //--------------------------------------------------------------------------------
685     /* IJS_SM_FILE_PUBLIC */
686    
687     #define MODULE_CREDITS
688    
689     #include "tcl.h"
690     #include "tcldecls.h"
691    
692     #include <string.h>
693    
694     #include "build_config.h"
695     #include "credits.h"
696    
697    
698     //The array below is an array of string pointers which give information about who
699     //is responsible for what and so forth. Each atomic group (by atomic I mean the
700     //the minimum unit to be printed) is separated by a NULL pointer.
701     static char *credits_array[] =
702     {
703     "******************************************************************************",
704     "* This product is an open-source statically-linked version of Tcl/Tk 8.3.1, *",
705     "* originally from Scriptics. This product and its source code can be *",
706     "* downloaded at no cost from http://ijutools.sourceforge.net. We are *",
707     "* especially grateful to SourceForge for providing version control and *",
708     "* hosting services to the open-source community, and for technical support *",
709     "* on many occasions. Without SourceForge, this project would not have been *",
710     "* possible. This product is licensed under the GNU Public License (GPL). *",
711     "******************************************************************************",
712     NULL,
713     "Tcl/Tk 8.3.1",
714     " Interwoven (formerly Ajuba Solutions, formerly Scriptics), with special",
715     " thanks to Jeff Hobbs, Jan Nijtmans, Dave Graveaux, D. Richard Hipp (for",
716     " \"mktclapp\"), Dan Kuchler, John Ousterhout, and everyone at comp.lang.tcl.",
717     NULL,
718     "arbint",
719     " Implemented by Dave Ashley. Special thanks to the co-authors on the",
720     " original rational approximation paper (Joe DeVoe, Karl Perttunen, Cory",
721     " Pratt, and Anatoly Zhigljavsky). Special thanks to GNU for the GNU MP",
722     " library (GMP), which was used as a model to implement large integer",
723     " arithmetic.",
724     NULL,
725     "credits",
726     " Dave Ashley.",
727     NULL,
728     "crc32",
729     " Ideas for implementation and critical subroutines from Richard A.",
730     " Ellingson. Implemented by Dave Ashley.",
731     NULL,
732     "vcinfo",
733     " Dave Ashley.",
734     NULL,
735     "******************************************************************************",
736     NULL,
737     "David T. Ashley, DTASHLEY@AOL.COM, DAVEASHLEY@DAVEASHLEY.COM",
738     NULL,
739     "Joseph P. Devoe, JDEVOE@VISTEON.COM",
740     NULL,
741     "Richard A. Ellingson, RELLING@MAXINET.COM",
742     NULL,
743     "D. Richard Hipp, DRH@ACM.ORG",
744     NULL,
745     "Karl Perttunen, KPERTTUN@VISTEON.COM",
746     NULL,
747     "Cory Pratt, CORY_PRATT@3COM.COM",
748     NULL,
749     "Anatoly Zhigljavsky, ZHIGLJAVSKYAA@CARDIFF.AC.UK",
750     NULL,
751     "******************************************************************************",
752     };
753    
754    
755     //Crude function to convert character to upper case.
756     static char credits_to_upper(char arg)
757     {
758     if ((arg >= 'a') && (arg <= 'z'))
759     {
760     return(arg - ('a'-'A'));
761     }
762     else
763     {
764     return(arg);
765     }
766     }
767    
768    
769     //Comparison function used to determine if one string exists within
770     //another. The C++ library didn't have quite the function needed,
771     //so will write a crude and inefficient version. Will return true
772     //if contained, false otherwise.
773     //
774     static int credits_string_contained(const char *container, const char *containee)
775     {
776     size_t i, j, container_len, containee_len;
777     unsigned matches;
778    
779     container_len = strlen(container);
780     containee_len = strlen(containee);
781    
782     for (i=0; i<container_len; i++)
783     {
784     if ((container_len - i) < containee_len)
785     {
786     return 0;
787     //Not enough room to contain a match, no sense to check.
788     }
789    
790     matches = 0;
791    
792     for (j = 0; j < containee_len; j++)
793     {
794     if (credits_to_upper(container[i+j]) != credits_to_upper(containee[j]))
795     {
796     matches = 0;
797     break;
798     }
799     else
800     {
801     if (j==(containee_len - 1))
802     {
803     matches = 1;
804     break;
805     }
806     }
807     }
808    
809     if (matches)
810     {
811     return 1;
812     }
813     }
814    
815     return 0;
816     }
817    
818    
819     //Procedure called when the "credits" command is encountered in a Tcl script.
820     //
821     int CreditsCmd(ClientData dummy,
822     Tcl_Interp *interp,
823     int objc,
824     Tcl_Obj *objv[])
825     {
826     Tcl_Obj *rv;
827     //Value that will be returned.
828     unsigned idx, cur;
829     //Iteration variable.
830     unsigned something_found;
831     //Set TRUE if at least one match is located so that something from the
832     //credits array is displayed.
833     unsigned return_string_populated;
834     //TRUE if return string has something in it already.
835     unsigned mark_all_true;
836     //Set TRUE if should return everything.
837     unsigned display_this_group;
838     //Set TRUE if should display the group we are iterating through.
839     char *sptr;
840     //Pointer to the Tcl-build obj string representation.
841     //This belongs to Tcl and may not be modified.
842    
843     /* Check to be sure if any arguments. If more than one argument,
844     ** should gen error.
845     */
846     if (objc > 2)
847     {
848     Tcl_WrongNumArgs(interp,
849     1,
850     objv,
851     "?searchstring?");
852    
853     return TCL_ERROR;
854     }
855     else if ((objc == 1) || (objc == 2))
856     {
857     //If we have only one argument on the command-line, return everything,
858     //otherwise search.
859     mark_all_true = (objc == 1);
860    
861     //Start off having found nothing.
862     something_found = 0;
863    
864     //Return string is not yet populated.
865     return_string_populated = 0;
866    
867     //Initialize the credits to an empty string. This will be added to.
868     rv = Tcl_NewStringObj("", -1);
869    
870     //Loop through the list, either trying to match against
871     //the searchstring or adding unconditionally.
872     for (idx = 0; idx < (sizeof(credits_array)/sizeof(credits_array[0])); idx++)
873     {
874     //We just can't do a lot if we are resting on a NULL pointer.
875     if (credits_array[idx])
876     {
877     //We are resting on a pointer which is necessarily the start
878     //of an array of strings that should be displayed
879     //atomically. If we had that second argument on the
880     //command line, must search the array for a match.
881     if (mark_all_true)
882     {
883     display_this_group = 1;
884     something_found = 1;
885     }
886     else
887     {
888     //We need to work a bit harder to figure out whether to display
889     //this group of strings.
890     //
891     //Get the internal pointer.
892     sptr = Tcl_GetString(objv[1]);
893    
894     //Loop through the embedded strings to see what to do. If find a
895     //match, can break immediately.
896     display_this_group = 0;
897     cur = idx;
898     while (credits_array[cur] && (cur < (sizeof(credits_array)/sizeof(credits_array[0]))))
899     {
900     if (credits_string_contained(credits_array[cur], sptr))
901     {
902     display_this_group = 1;
903     something_found = 1;
904     break;
905     }
906     cur++;
907     }
908     }
909    
910    
911     //We need to append a newline here if this ain't our first time
912     //tacking something into the return string.
913     if (display_this_group)
914     {
915     if (return_string_populated)
916     {
917     Tcl_AppendToObj(rv, "\n", -1);
918     }
919     else
920     {
921     return_string_populated = 1;
922     }
923     }
924    
925    
926     //Stage the material of interest in the return object. This also advances
927     //the array index.
928     while (credits_array[idx] && (idx < (sizeof(credits_array)/sizeof(credits_array[0]))))
929     {
930     if (display_this_group)
931     {
932     //Add the line of interest.
933     Tcl_AppendToObj(rv, credits_array[idx], -1);
934    
935     //If not the very last string of the array or the last of a
936     //group, append newline.
937     if (idx != ((sizeof(credits_array)/sizeof(credits_array[0]))-1))
938     {
939     if (credits_array[idx+1])
940     {
941     Tcl_AppendToObj(rv, "\n", -1);
942     }
943     }
944     }
945    
946     idx++;
947     }
948     }
949     }
950     }
951     else
952     {
953     //Should never get here. If do, no harm, as will do
954     //nothing and "credits" will not work--that is a bug
955     //that will definitely get looked at.
956     }
957    
958     //Return the right result to the caller. If nothing was found, must say so.
959     if (!something_found)
960     {
961     Tcl_AppendToObj(rv, "No matches.", -1);
962     }
963     Tcl_SetObjResult(interp, rv);
964     return(TCL_OK);
965     }
966    
967    
968     //Performs initial registration to the hash table.
969     //
970     void CreditsInit(Tcl_Interp *interp)
971     {
972     //Register a command named "credits".
973     Tcl_CreateObjCommand(interp,
974     "credits",
975     (Tcl_ObjCmdProc *)CreditsCmd,
976     NULL,
977     NULL);
978     }
979    
980    
981     const char *CreditsCversion(void)
982     {
983     return ("$Revision: 1.5 $ $Modtime: 1/01/01 11:45p $ $Author: dtashley $");
984     }
985    
986    
987     const char *CreditsHversion(void)
988     {
989     return (CREDITS_H_VERSION);
990     }
991    
992    
993     /*
994     * $Log: credits.c,v $
995     * Revision 1.5 2001/08/16 12:20:09 dtashley
996     * Version number changes.
997     *
998     * Revision 1.4 2001/06/20 20:42:28 dtashley
999     * Final changes before release of v1.04.
1000     *
1001     * Revision 1.3 2001/06/20 03:32:56 dtashley
1002     * Modifications for version 1.04.
1003     *
1004     * Revision 1.2 2001/06/20 02:41:52 dtashley
1005     * Conversion from binary mode, changes in opening tool announcement.
1006     *
1007     * $History: credits.c $
1008     *
1009     * ***************** Version 1 *****************
1010     * User: Dtashley Date: 1/01/01 Time: 11:45p
1011     * Created in $/IjuScripter, IjuConsole/Source/Tcl-Tk Extensions
1012     * Initial check-in.
1013     */
1014    
1015     /* End of CREDITS.C */

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