/[dtapublic]/projs/dtats/trunk/shared_source/c_tclxtens_7_5/credits.c
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to_be_filed/sf_code/esrgpcpj/shared/tclxtens/credits.c revision 29 by dashley, Sat Oct 8 07:08:47 2016 UTC projs/dtats/trunk/shared_source/c_tclxtens_7_5/credits.c revision 98 by dashley, Sun Dec 18 00:57:31 2016 UTC
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1  /* $Header: /cvsroot/esrg/sfesrg/esrgpcpj/shared/tclxtens/credits.c,v 1.5 2001/08/16 12:20:09 dtashley Exp $ */  //$Header$
2    //-------------------------------------------------------------------------------------------------
3  //--------------------------------------------------------------------------------  //This file is part of "David T. Ashley's Shared Source Code", a set of shared components
4  //Copyright 2001 David T. Ashley  //integrated into many of David T. Ashley's projects.
5  //-------------------------------------------------------------------------------------------------  //-------------------------------------------------------------------------------------------------
6  //This source code and any program in which it is compiled/used is provided under the GNU GENERAL  //This source code and any program in which it is compiled/used is provided under the MIT License,
7  //PUBLIC LICENSE, Version 3, full license text below.  //reproduced below.
8  //-------------------------------------------------------------------------------------------------  //-------------------------------------------------------------------------------------------------
9  //                    GNU GENERAL PUBLIC LICENSE  //Permission is hereby granted, free of charge, to any person obtaining a copy of
10  //                       Version 3, 29 June 2007  //this software and associated documentation files(the "Software"), to deal in the
11  //  //Software without restriction, including without limitation the rights to use,
12  // Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>  //copy, modify, merge, publish, distribute, sublicense, and / or sell copies of the
13  // Everyone is permitted to copy and distribute verbatim copies  //Software, and to permit persons to whom the Software is furnished to do so,
14  // of this license document, but changing it is not allowed.  //subject to the following conditions :
15  //  //
16  //                            Preamble  //The above copyright notice and this permission notice shall be included in all
17  //  //copies or substantial portions of the Software.
18  //  The GNU General Public License is a free, copyleft license for  //
19  //software and other kinds of works.  //THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
20  //  //IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
21  //  The licenses for most software and other practical works are designed  //FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.IN NO EVENT SHALL THE
22  //to take away your freedom to share and change the works.  By contrast,  //AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
23  //the GNU General Public License is intended to guarantee your freedom to  //LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
24  //share and change all versions of a program--to make sure it remains free  //OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
25  //software for all its users.  We, the Free Software Foundation, use the  //SOFTWARE.
26  //GNU General Public License for most of our software; it applies also to  //-------------------------------------------------------------------------------------------------
27  //any other work released this way by its authors.  You can apply it to  #define MODULE_CREDITS
28  //your programs, too.  
29  //  #include "tcl.h"
30  //  When we speak of free software, we are referring to freedom, not  #include "tcldecls.h"
31  //price.  Our General Public Licenses are designed to make sure that you  
32  //have the freedom to distribute copies of free software (and charge for  #include <string.h>
33  //them if you wish), that you receive source code or can get it if you  
34  //want it, that you can change the software or use pieces of it in new  #include "build_config.h"
35  //free programs, and that you know you can do these things.  #include "credits.h"
36  //  
37  //  To protect your rights, we need to prevent others from denying you  
38  //these rights or asking you to surrender the rights.  Therefore, you have  //The array below is an array of string pointers which give information about who
39  //certain responsibilities if you distribute copies of the software, or if  //is responsible for what and so forth.  Each atomic group (by atomic I mean the
40  //you modify it: responsibilities to respect the freedom of others.  //the minimum unit to be printed) is separated by a NULL pointer.
41  //  static char *credits_array[] =
42  //  For example, if you distribute copies of such a program, whether     {
43  //gratis or for a fee, you must pass on to the recipients the same     "******************************************************************************",
44  //freedoms that you received.  You must make sure that they, too, receive     "* This product is an open-source statically-linked version of Tcl/Tk 8.3.1,  *",
45  //or can get the source code.  And you must show them these terms so they     "* originally from Scriptics.  This product and its source code can be        *",
46  //know their rights.     "* downloaded at no cost from http://ijutools.sourceforge.net.  We are        *",
47  //     "* especially grateful to SourceForge for providing version control and       *",
48  //  Developers that use the GNU GPL protect your rights with two steps:     "* hosting services to the open-source community, and for technical support   *",
49  //(1) assert copyright on the software, and (2) offer you this License     "* on many occasions.  Without SourceForge, this project would not have been  *",
50  //giving you legal permission to copy, distribute and/or modify it.     "* possible.  This product is licensed under the GNU Public License (GPL).    *",
51  //     "******************************************************************************",
52  //  For the developers' and authors' protection, the GPL clearly explains     NULL,
53  //that there is no warranty for this free software.  For both users' and     "Tcl/Tk 8.3.1",
54  //authors' sake, the GPL requires that modified versions be marked as     "   Interwoven (formerly Ajuba Solutions, formerly Scriptics), with special",
55  //changed, so that their problems will not be attributed erroneously to     "   thanks to Jeff Hobbs, Jan Nijtmans, Dave Graveaux, D. Richard Hipp (for",
56  //authors of previous versions.     "   \"mktclapp\"), Dan Kuchler, John Ousterhout, and everyone at comp.lang.tcl.",
57  //     NULL,
58  //  Some devices are designed to deny users access to install or run     "arbint",
59  //modified versions of the software inside them, although the manufacturer     "   Implemented by Dave Ashley.  Special thanks to the co-authors on the",
60  //can do so.  This is fundamentally incompatible with the aim of     "   original rational approximation paper (Joe DeVoe, Karl Perttunen, Cory",
61  //protecting users' freedom to change the software.  The systematic     "   Pratt, and Anatoly Zhigljavsky).  Special thanks to GNU for the GNU MP",
62  //pattern of such abuse occurs in the area of products for individuals to     "   library (GMP), which was used as a model to implement large integer",
63  //use, which is precisely where it is most unacceptable.  Therefore, we     "   arithmetic.",
64  //have designed this version of the GPL to prohibit the practice for those     NULL,
65  //products.  If such problems arise substantially in other domains, we     "credits",
66  //stand ready to extend this provision to those domains in future versions     "   Dave Ashley.",
67  //of the GPL, as needed to protect the freedom of users.     NULL,
68  //     "crc32",
69  //  Finally, every program is threatened constantly by software patents.     "   Ideas for implementation and critical subroutines from Richard A.",
70  //States should not allow patents to restrict development and use of     "   Ellingson.  Implemented by Dave Ashley.",
71  //software on general-purpose computers, but in those that do, we wish to     NULL,
72  //avoid the special danger that patents applied to a free program could     "vcinfo",
73  //make it effectively proprietary.  To prevent this, the GPL assures that     "   Dave Ashley.",
74  //patents cannot be used to render the program non-free.     NULL,
75  //     "******************************************************************************",
76  //  The precise terms and conditions for copying, distribution and     NULL,
77  //modification follow.     "David T. Ashley, DTASHLEY@AOL.COM, DAVEASHLEY@DAVEASHLEY.COM",
78  //     NULL,
79  //                       TERMS AND CONDITIONS     "Joseph P. Devoe, JDEVOE@VISTEON.COM",
80  //     NULL,
81  //  0. Definitions.     "Richard A. Ellingson, RELLING@MAXINET.COM",
82  //     NULL,
83  //  "This License" refers to version 3 of the GNU General Public License.     "D. Richard Hipp, DRH@ACM.ORG",
84  //     NULL,
85  //  "Copyright" also means copyright-like laws that apply to other kinds of     "Karl Perttunen, KPERTTUN@VISTEON.COM",
86  //works, such as semiconductor masks.     NULL,
87  //     "Cory Pratt, CORY_PRATT@3COM.COM",
88  //  "The Program" refers to any copyrightable work licensed under this     NULL,
89  //License.  Each licensee is addressed as "you".  "Licensees" and     "Anatoly Zhigljavsky, ZHIGLJAVSKYAA@CARDIFF.AC.UK",
90  //"recipients" may be individuals or organizations.     NULL,
91  //     "******************************************************************************",
92  //  To "modify" a work means to copy from or adapt all or part of the work     };
93  //in a fashion requiring copyright permission, other than the making of an  
94  //exact copy.  The resulting work is called a "modified version" of the  
95  //earlier work or a work "based on" the earlier work.  //Crude function to convert character to upper case.
96  //  static char credits_to_upper(char arg)
97  //  A "covered work" means either the unmodified Program or a work based     {
98  //on the Program.     if ((arg >= 'a') && (arg <= 'z'))
99  //        {
100  //  To "propagate" a work means to do anything with it that, without        return(arg - ('a'-'A'));
101  //permission, would make you directly or secondarily liable for        }
102  //infringement under applicable copyright law, except executing it on a     else
103  //computer or modifying a private copy.  Propagation includes copying,        {
104  //distribution (with or without modification), making available to the        return(arg);
105  //public, and in some countries other activities as well.        }
106  //     }
107  //  To "convey" a work means any kind of propagation that enables other  
108  //parties to make or receive copies.  Mere interaction with a user through  
109  //a computer network, with no transfer of a copy, is not conveying.  //Comparison function used to determine if one string exists within
110  //  //another.  The C++ library didn't have quite the function needed,
111  //  An interactive user interface displays "Appropriate Legal Notices"  //so will write a crude and inefficient version.  Will return true
112  //to the extent that it includes a convenient and prominently visible  //if contained, false otherwise.
113  //feature that (1) displays an appropriate copyright notice, and (2)  //
114  //tells the user that there is no warranty for the work (except to the  static int credits_string_contained(const char *container, const char *containee)
115  //extent that warranties are provided), that licensees may convey the     {
116  //work under this License, and how to view a copy of this License.  If     size_t   i, j, container_len, containee_len;
117  //the interface presents a list of user commands or options, such as a     unsigned matches;
118  //menu, a prominent item in the list meets this criterion.  
119  //     container_len = strlen(container);
120  //  1. Source Code.     containee_len = strlen(containee);
121  //  
122  //  The "source code" for a work means the preferred form of the work     for (i=0; i<container_len; i++)
123  //for making modifications to it.  "Object code" means any non-source        {
124  //form of a work.        if ((container_len - i) < containee_len)
125  //           {
126  //  A "Standard Interface" means an interface that either is an official           return 0;
127  //standard defined by a recognized standards body, or, in the case of             //Not enough room to contain a match, no sense to check.
128  //interfaces specified for a particular programming language, one that           }
129  //is widely used among developers working in that language.        
130  //        matches = 0;
131  //  The "System Libraries" of an executable work include anything, other  
132  //than the work as a whole, that (a) is included in the normal form of        for (j = 0; j < containee_len; j++)
133  //packaging a Major Component, but which is not part of that Major           {
134  //Component, and (b) serves only to enable use of the work with that           if (credits_to_upper(container[i+j]) != credits_to_upper(containee[j]))
135  //Major Component, or to implement a Standard Interface for which an              {
136  //implementation is available to the public in source code form.  A              matches = 0;
137  //"Major Component", in this context, means a major essential component              break;
138  //(kernel, window system, and so on) of the specific operating system              }
139  //(if any) on which the executable work runs, or a compiler used to           else
140  //produce the work, or an object code interpreter used to run it.              {
141  //              if (j==(containee_len - 1))
142  //  The "Corresponding Source" for a work in object code form means all                 {
143  //the source code needed to generate, install, and (for an executable                 matches = 1;
144  //work) run the object code and to modify the work, including scripts to                 break;
145  //control those activities.  However, it does not include the work's                 }
146  //System Libraries, or general-purpose tools or generally available free              }
147  //programs which are used unmodified in performing those activities but           }
148  //which are not part of the work.  For example, Corresponding Source  
149  //includes interface definition files associated with source files for        if (matches)
150  //the work, and the source code for shared libraries and dynamically           {
151  //linked subprograms that the work is specifically designed to require,           return 1;
152  //such as by intimate data communication or control flow between those           }
153  //subprograms and other parts of the work.        }
154  //  
155  //  The Corresponding Source need not include anything that users     return 0;
156  //can regenerate automatically from other parts of the Corresponding     }
157  //Source.  
158  //  
159  //  The Corresponding Source for a work in source code form is that  //Procedure called when the "credits" command is encountered in a Tcl script.
160  //same work.  //
161  //  int CreditsCmd(ClientData dummy,
162  //  2. Basic Permissions.                 Tcl_Interp *interp,
163  //                 int objc,
164  //  All rights granted under this License are granted for the term of                 Tcl_Obj *objv[])
165  //copyright on the Program, and are irrevocable provided the stated     {
166  //conditions are met.  This License explicitly affirms your unlimited   Tcl_Obj *rv;
167  //permission to run the unmodified Program.  The output from running a        //Value that will be returned.
168  //covered work is covered by this License only if the output, given its     unsigned idx, cur;
169  //content, constitutes a covered work.  This License acknowledges your        //Iteration variable.
170  //rights of fair use or other equivalent, as provided by copyright law.     unsigned something_found;
171  //        //Set TRUE if at least one match is located so that something from the
172  //  You may make, run and propagate covered works that you do not        //credits array is displayed.
173  //convey, without conditions so long as your license otherwise remains     unsigned return_string_populated;
174  //in force.  You may convey covered works to others for the sole purpose        //TRUE if return string has something in it already.
175  //of having them make modifications exclusively for you, or provide you     unsigned mark_all_true;
176  //with facilities for running those works, provided that you comply with        //Set TRUE if should return everything.
177  //the terms of this License in conveying all material for which you do     unsigned display_this_group;
178  //not control copyright.  Those thus making or running the covered works        //Set TRUE if should display the group we are iterating through.
179  //for you must do so exclusively on your behalf, under your direction     char *sptr;
180  //and control, on terms that prohibit them from making any copies of        //Pointer to the Tcl-build obj string representation.
181  //your copyrighted material outside their relationship with you.        //This belongs to Tcl and may not be modified.
182  //  
183  //  Conveying under any other circumstances is permitted solely under     /* Check to be sure if any arguments.  If more than one argument,
184  //the conditions stated below.  Sublicensing is not allowed; section 10     ** should gen error.
185  //makes it unnecessary.     */
186  //     if (objc > 2)
187  //  3. Protecting Users' Legal Rights From Anti-Circumvention Law.        {
188  //        Tcl_WrongNumArgs(interp,
189  //  No covered work shall be deemed part of an effective technological                         1,
190  //measure under any applicable law fulfilling obligations under article                         objv,
191  //11 of the WIPO copyright treaty adopted on 20 December 1996, or                         "?searchstring?");
192  //similar laws prohibiting or restricting circumvention of such  
193  //measures.        return TCL_ERROR;
194  //        }
195  //  When you convey a covered work, you waive any legal power to forbid     else if ((objc == 1) || (objc == 2))
196  //circumvention of technological measures to the extent such circumvention        {
197  //is effected by exercising rights under this License with respect to        //If we have only one argument on the command-line, return everything,
198  //the covered work, and you disclaim any intention to limit operation or        //otherwise search.
199  //modification of the work as a means of enforcing, against the work's        mark_all_true = (objc == 1);
200  //users, your or third parties' legal rights to forbid circumvention of  
201  //technological measures.        //Start off having found nothing.
202  //        something_found = 0;
203  //  4. Conveying Verbatim Copies.        
204  //        //Return string is not yet populated.
205  //  You may convey verbatim copies of the Program's source code as you        return_string_populated = 0;
206  //receive it, in any medium, provided that you conspicuously and  
207  //appropriately publish on each copy an appropriate copyright notice;        //Initialize the credits to an empty string.  This will be added to.
208  //keep intact all notices stating that this License and any        rv = Tcl_NewStringObj("", -1);
209  //non-permissive terms added in accord with section 7 apply to the code;  
210  //keep intact all notices of the absence of any warranty; and give all        //Loop through the list, either trying to match against
211  //recipients a copy of this License along with the Program.        //the searchstring or adding unconditionally.
212  //        for (idx = 0; idx < (sizeof(credits_array)/sizeof(credits_array[0])); idx++)
213  //  You may charge any price or no price for each copy that you convey,           {
214  //and you may offer support or warranty protection for a fee.           //We just can't do a lot if we are resting on a NULL pointer.
215  //           if (credits_array[idx])
216  //  5. Conveying Modified Source Versions.              {
217  //              //We are resting on a pointer which is necessarily the start
218  //  You may convey a work based on the Program, or the modifications to              //of an array of strings that should be displayed
219  //produce it from the Program, in the form of source code under the              //atomically.  If we had that second argument on the
220  //terms of section 4, provided that you also meet all of these conditions:              //command line, must search the array for a match.
221  //              if (mark_all_true)
222  //    a) The work must carry prominent notices stating that you modified                 {
223  //    it, and giving a relevant date.                 display_this_group = 1;
224  //                 something_found = 1;
225  //    b) The work must carry prominent notices stating that it is                 }
226  //    released under this License and any conditions added under section              else
227  //    7.  This requirement modifies the requirement in section 4 to                 {
228  //    "keep intact all notices".                 //We need to work a bit harder to figure out whether to display
229  //                 //this group of strings.
230  //    c) You must license the entire work, as a whole, under this                 //
231  //    License to anyone who comes into possession of a copy.  This                 //Get the internal pointer.
232  //    License will therefore apply, along with any applicable section 7                 sptr = Tcl_GetString(objv[1]);
233  //    additional terms, to the whole of the work, and all its parts,  
234  //    regardless of how they are packaged.  This License gives no                 //Loop through the embedded strings to see what to do.  If find a
235  //    permission to license the work in any other way, but it does not                 //match, can break immediately.
236  //    invalidate such permission if you have separately received it.                 display_this_group = 0;
237  //                 cur = idx;
238  //    d) If the work has interactive user interfaces, each must display                 while (credits_array[cur] && (cur < (sizeof(credits_array)/sizeof(credits_array[0]))))
239  //    Appropriate Legal Notices; however, if the Program has interactive                    {
240  //    interfaces that do not display Appropriate Legal Notices, your                    if (credits_string_contained(credits_array[cur], sptr))
241  //    work need not make them do so.                       {
242  //                       display_this_group = 1;
243  //  A compilation of a covered work with other separate and independent                       something_found = 1;
244  //works, which are not by their nature extensions of the covered work,                       break;
245  //and which are not combined with it such as to form a larger program,                       }
246  //in or on a volume of a storage or distribution medium, is called an                    cur++;
247  //"aggregate" if the compilation and its resulting copyright are not                    }
248  //used to limit the access or legal rights of the compilation's users                 }
249  //beyond what the individual works permit.  Inclusion of a covered work  
250  //in an aggregate does not cause this License to apply to the other  
251  //parts of the aggregate.              //We need to append a newline here if this ain't our first time
252  //              //tacking something into the return string.
253  //  6. Conveying Non-Source Forms.              if (display_this_group)
254  //                 {
255  //  You may convey a covered work in object code form under the terms                 if (return_string_populated)
256  //of sections 4 and 5, provided that you also convey the                    {
257  //machine-readable Corresponding Source under the terms of this License,                    Tcl_AppendToObj(rv, "\n", -1);
258  //in one of these ways:                    }
259  //                 else
260  //    a) Convey the object code in, or embodied in, a physical product                    {
261  //    (including a physical distribution medium), accompanied by the                    return_string_populated = 1;
262  //    Corresponding Source fixed on a durable physical medium                    }
263  //    customarily used for software interchange.                 }
264  //  
265  //    b) Convey the object code in, or embodied in, a physical product  
266  //    (including a physical distribution medium), accompanied by a              //Stage the material of interest in the return object.  This also advances
267  //    written offer, valid for at least three years and valid for as              //the array index.
268  //    long as you offer spare parts or customer support for that product              while (credits_array[idx] && (idx < (sizeof(credits_array)/sizeof(credits_array[0]))))
269  //    model, to give anyone who possesses the object code either (1) a                 {
270  //    copy of the Corresponding Source for all the software in the                 if (display_this_group)
271  //    product that is covered by this License, on a durable physical                    {
272  //    medium customarily used for software interchange, for a price no                    //Add the line of interest.
273  //    more than your reasonable cost of physically performing this                    Tcl_AppendToObj(rv, credits_array[idx], -1);
274  //    conveying of source, or (2) access to copy the  
275  //    Corresponding Source from a network server at no charge.                    //If not the very last string of the array or the last of a
276  //                    //group, append newline.
277  //    c) Convey individual copies of the object code with a copy of the                    if (idx != ((sizeof(credits_array)/sizeof(credits_array[0]))-1))
278  //    written offer to provide the Corresponding Source.  This                       {
279  //    alternative is allowed only occasionally and noncommercially, and                       if (credits_array[idx+1])
280  //    only if you received the object code with such an offer, in accord                          {
281  //    with subsection 6b.                          Tcl_AppendToObj(rv, "\n", -1);
282  //                          }
283  //    d) Convey the object code by offering access from a designated                       }
284  //    place (gratis or for a charge), and offer equivalent access to the                    }
285  //    Corresponding Source in the same way through the same place at no  
286  //    further charge.  You need not require recipients to copy the                 idx++;
287  //    Corresponding Source along with the object code.  If the place to                 }
288  //    copy the object code is a network server, the Corresponding Source              }
289  //    may be on a different server (operated by you or a third party)           }
290  //    that supports equivalent copying facilities, provided you maintain        }
291  //    clear directions next to the object code saying where to find the     else
292  //    Corresponding Source.  Regardless of what server hosts the        {
293  //    Corresponding Source, you remain obligated to ensure that it is        //Should never get here.  If do, no harm, as will do
294  //    available for as long as needed to satisfy these requirements.        //nothing and "credits" will not work--that is a bug
295  //        //that will definitely get looked at.
296  //    e) Convey the object code using peer-to-peer transmission, provided        }
297  //    you inform other peers where the object code and Corresponding  
298  //    Source of the work are being offered to the general public at no     //Return the right result to the caller.  If nothing was found, must say so.
299  //    charge under subsection 6d.     if (!something_found)
300  //        {
301  //  A separable portion of the object code, whose source code is excluded        Tcl_AppendToObj(rv, "No matches.", -1);
302  //from the Corresponding Source as a System Library, need not be        }
303  //included in conveying the object code work.     Tcl_SetObjResult(interp, rv);
304  //     return(TCL_OK);
305  //  A "User Product" is either (1) a "consumer product", which means any     }
306  //tangible personal property which is normally used for personal, family,  
307  //or household purposes, or (2) anything designed or sold for incorporation  
308  //into a dwelling.  In determining whether a product is a consumer product,  //Performs initial registration to the hash table.
309  //doubtful cases shall be resolved in favor of coverage.  For a particular  //
310  //product received by a particular user, "normally used" refers to a  void CreditsInit(Tcl_Interp *interp)
311  //typical or common use of that class of product, regardless of the status     {
312  //of the particular user or of the way in which the particular user     //Register a command named "credits".
313  //actually uses, or expects or is expected to use, the product.  A product     Tcl_CreateObjCommand(interp,
314  //is a consumer product regardless of whether the product has substantial                          "credits",
315  //commercial, industrial or non-consumer uses, unless such uses represent                          (Tcl_ObjCmdProc *)CreditsCmd,
316  //the only significant mode of use of the product.                          NULL,
317  //                          NULL);
318  //  "Installation Information" for a User Product means any methods,     }
319  //procedures, authorization keys, or other information required to install  
320  //and execute modified versions of a covered work in that User Product from  
321  //a modified version of its Corresponding Source.  The information must  const char *CreditsCversion(void)
322  //suffice to ensure that the continued functioning of the modified object     {  
323  //code is in no case prevented or interfered with solely because     return ("$Header$");
324  //modification has been made.     }
325  //  
326  //  If you convey an object code work under this section in, or with, or  
327  //specifically for use in, a User Product, and the conveying occurs as  const char *CreditsHversion(void)
328  //part of a transaction in which the right of possession and use of the     {  
329  //User Product is transferred to the recipient in perpetuity or for a     return (CREDITS_H_VERSION);
330  //fixed term (regardless of how the transaction is characterized), the     }
331  //Corresponding Source conveyed under this section must be accompanied  
332  //by the Installation Information.  But this requirement does not apply  /* End of credits.c */
 //if neither you nor any third party retains the ability to install  
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 //-------------------------------------------------------------------------------------------------  
 //--------------------------------------------------------------------------------  
 /* IJS_SM_FILE_PUBLIC */  
   
 #define MODULE_CREDITS  
   
 #include "tcl.h"  
 #include "tcldecls.h"  
   
 #include <string.h>  
   
 #include "build_config.h"  
 #include "credits.h"  
   
   
 //The array below is an array of string pointers which give information about who  
 //is responsible for what and so forth.  Each atomic group (by atomic I mean the  
 //the minimum unit to be printed) is separated by a NULL pointer.  
 static char *credits_array[] =  
    {  
    "******************************************************************************",  
    "* This product is an open-source statically-linked version of Tcl/Tk 8.3.1,  *",  
    "* originally from Scriptics.  This product and its source code can be        *",  
    "* downloaded at no cost from http://ijutools.sourceforge.net.  We are        *",  
    "* especially grateful to SourceForge for providing version control and       *",  
    "* hosting services to the open-source community, and for technical support   *",  
    "* on many occasions.  Without SourceForge, this project would not have been  *",  
    "* possible.  This product is licensed under the GNU Public License (GPL).    *",  
    "******************************************************************************",  
    NULL,  
    "Tcl/Tk 8.3.1",  
    "   Interwoven (formerly Ajuba Solutions, formerly Scriptics), with special",  
    "   thanks to Jeff Hobbs, Jan Nijtmans, Dave Graveaux, D. Richard Hipp (for",  
    "   \"mktclapp\"), Dan Kuchler, John Ousterhout, and everyone at comp.lang.tcl.",  
    NULL,  
    "arbint",  
    "   Implemented by Dave Ashley.  Special thanks to the co-authors on the",  
    "   original rational approximation paper (Joe DeVoe, Karl Perttunen, Cory",  
    "   Pratt, and Anatoly Zhigljavsky).  Special thanks to GNU for the GNU MP",  
    "   library (GMP), which was used as a model to implement large integer",  
    "   arithmetic.",  
    NULL,  
    "credits",  
    "   Dave Ashley.",  
    NULL,  
    "crc32",  
    "   Ideas for implementation and critical subroutines from Richard A.",  
    "   Ellingson.  Implemented by Dave Ashley.",  
    NULL,  
    "vcinfo",  
    "   Dave Ashley.",  
    NULL,  
    "******************************************************************************",  
    NULL,  
    "David T. Ashley, DTASHLEY@AOL.COM, DAVEASHLEY@DAVEASHLEY.COM",  
    NULL,  
    "Joseph P. Devoe, JDEVOE@VISTEON.COM",  
    NULL,  
    "Richard A. Ellingson, RELLING@MAXINET.COM",  
    NULL,  
    "D. Richard Hipp, DRH@ACM.ORG",  
    NULL,  
    "Karl Perttunen, KPERTTUN@VISTEON.COM",  
    NULL,  
    "Cory Pratt, CORY_PRATT@3COM.COM",  
    NULL,  
    "Anatoly Zhigljavsky, ZHIGLJAVSKYAA@CARDIFF.AC.UK",  
    NULL,  
    "******************************************************************************",  
    };  
   
   
 //Crude function to convert character to upper case.  
 static char credits_to_upper(char arg)  
    {  
    if ((arg >= 'a') && (arg <= 'z'))  
       {  
       return(arg - ('a'-'A'));  
       }  
    else  
       {  
       return(arg);  
       }  
    }  
   
   
 //Comparison function used to determine if one string exists within  
 //another.  The C++ library didn't have quite the function needed,  
 //so will write a crude and inefficient version.  Will return true  
 //if contained, false otherwise.  
 //  
 static int credits_string_contained(const char *container, const char *containee)  
    {  
    size_t   i, j, container_len, containee_len;  
    unsigned matches;  
   
    container_len = strlen(container);  
    containee_len = strlen(containee);  
   
    for (i=0; i<container_len; i++)  
       {  
       if ((container_len - i) < containee_len)  
          {  
          return 0;  
            //Not enough room to contain a match, no sense to check.  
          }  
         
       matches = 0;  
   
       for (j = 0; j < containee_len; j++)  
          {  
          if (credits_to_upper(container[i+j]) != credits_to_upper(containee[j]))  
             {  
             matches = 0;  
             break;  
             }  
          else  
             {  
             if (j==(containee_len - 1))  
                {  
                matches = 1;  
                break;  
                }  
             }  
          }  
   
       if (matches)  
          {  
          return 1;  
          }  
       }  
   
    return 0;  
    }  
   
   
 //Procedure called when the "credits" command is encountered in a Tcl script.  
 //  
 int CreditsCmd(ClientData dummy,  
                Tcl_Interp *interp,  
                int objc,  
                Tcl_Obj *objv[])  
    {  
  Tcl_Obj *rv;  
       //Value that will be returned.  
    unsigned idx, cur;  
       //Iteration variable.  
    unsigned something_found;  
       //Set TRUE if at least one match is located so that something from the  
       //credits array is displayed.  
    unsigned return_string_populated;  
       //TRUE if return string has something in it already.  
    unsigned mark_all_true;  
       //Set TRUE if should return everything.  
    unsigned display_this_group;  
       //Set TRUE if should display the group we are iterating through.  
    char *sptr;  
       //Pointer to the Tcl-build obj string representation.  
       //This belongs to Tcl and may not be modified.  
   
    /* Check to be sure if any arguments.  If more than one argument,  
    ** should gen error.  
    */  
    if (objc > 2)  
       {  
       Tcl_WrongNumArgs(interp,  
                        1,  
                        objv,  
                        "?searchstring?");  
   
       return TCL_ERROR;  
       }  
    else if ((objc == 1) || (objc == 2))  
       {  
       //If we have only one argument on the command-line, return everything,  
       //otherwise search.  
       mark_all_true = (objc == 1);  
   
       //Start off having found nothing.  
       something_found = 0;  
         
       //Return string is not yet populated.  
       return_string_populated = 0;  
   
       //Initialize the credits to an empty string.  This will be added to.  
       rv = Tcl_NewStringObj("", -1);  
   
       //Loop through the list, either trying to match against  
       //the searchstring or adding unconditionally.  
       for (idx = 0; idx < (sizeof(credits_array)/sizeof(credits_array[0])); idx++)  
          {  
          //We just can't do a lot if we are resting on a NULL pointer.  
          if (credits_array[idx])  
             {  
             //We are resting on a pointer which is necessarily the start  
             //of an array of strings that should be displayed  
             //atomically.  If we had that second argument on the  
             //command line, must search the array for a match.  
             if (mark_all_true)  
                {  
                display_this_group = 1;  
                something_found = 1;  
                }  
             else  
                {  
                //We need to work a bit harder to figure out whether to display  
                //this group of strings.  
                //  
                //Get the internal pointer.  
                sptr = Tcl_GetString(objv[1]);  
   
                //Loop through the embedded strings to see what to do.  If find a  
                //match, can break immediately.  
                display_this_group = 0;  
                cur = idx;  
                while (credits_array[cur] && (cur < (sizeof(credits_array)/sizeof(credits_array[0]))))  
                   {  
                   if (credits_string_contained(credits_array[cur], sptr))  
                      {  
                      display_this_group = 1;  
                      something_found = 1;  
                      break;  
                      }  
                   cur++;  
                   }  
                }  
   
   
             //We need to append a newline here if this ain't our first time  
             //tacking something into the return string.  
             if (display_this_group)  
                {  
                if (return_string_populated)  
                   {  
                   Tcl_AppendToObj(rv, "\n", -1);  
                   }  
                else  
                   {  
                   return_string_populated = 1;  
                   }  
                }  
   
   
             //Stage the material of interest in the return object.  This also advances  
             //the array index.  
             while (credits_array[idx] && (idx < (sizeof(credits_array)/sizeof(credits_array[0]))))  
                {  
                if (display_this_group)  
                   {  
                   //Add the line of interest.  
                   Tcl_AppendToObj(rv, credits_array[idx], -1);  
   
                   //If not the very last string of the array or the last of a  
                   //group, append newline.  
                   if (idx != ((sizeof(credits_array)/sizeof(credits_array[0]))-1))  
                      {  
                      if (credits_array[idx+1])  
                         {  
                         Tcl_AppendToObj(rv, "\n", -1);  
                         }  
                      }  
                   }  
   
                idx++;  
                }  
             }  
          }  
       }  
    else  
       {  
       //Should never get here.  If do, no harm, as will do  
       //nothing and "credits" will not work--that is a bug  
       //that will definitely get looked at.  
       }  
   
    //Return the right result to the caller.  If nothing was found, must say so.  
    if (!something_found)  
       {  
       Tcl_AppendToObj(rv, "No matches.", -1);  
       }  
    Tcl_SetObjResult(interp, rv);  
    return(TCL_OK);  
    }  
   
   
 //Performs initial registration to the hash table.  
 //  
 void CreditsInit(Tcl_Interp *interp)  
    {  
    //Register a command named "credits".  
    Tcl_CreateObjCommand(interp,  
                         "credits",  
                         (Tcl_ObjCmdProc *)CreditsCmd,  
                         NULL,  
                         NULL);  
    }  
   
   
 const char *CreditsCversion(void)  
    {    
    return ("$Revision: 1.5 $ $Modtime: 1/01/01 11:45p $ $Author: dtashley $");  
    }  
   
   
 const char *CreditsHversion(void)  
    {    
    return (CREDITS_H_VERSION);  
    }  
   
   
 /*  
  * $Log: credits.c,v $  
  * Revision 1.5  2001/08/16 12:20:09  dtashley  
  * Version number changes.  
  *  
  * Revision 1.4  2001/06/20 20:42:28  dtashley  
  * Final changes before release of v1.04.  
  *  
  * Revision 1.3  2001/06/20 03:32:56  dtashley  
  * Modifications for version 1.04.  
  *  
  * Revision 1.2  2001/06/20 02:41:52  dtashley  
  * Conversion from binary mode, changes in opening tool announcement.  
  *  
  * $History: credits.c $  
  *  
  * *****************  Version 1  *****************  
  * User: Dtashley     Date: 1/01/01    Time: 11:45p  
  * Created in $/IjuScripter, IjuConsole/Source/Tcl-Tk Extensions  
  * Initial check-in.  
  */  
   
 /* End of CREDITS.C */  
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