about summary refs log tree commit diff stats
path: root/WWW/Library/Implementation/HTAnchor.c
blob: a141213c74985519dcf631b93cadc34b7dcbeaf7 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
/*	Hypertext "Anchor" Object				HTAnchor.c
**	==========================
**
** An anchor represents a region of a hypertext document which is linked to
** another anchor in the same or a different document.
**
** History
**
**	   Nov 1990  Written in Objective-C for the NeXT browser (TBL)
**	24-Oct-1991 (JFG), written in C, browser-independent
**	21-Nov-1991 (JFG), first complete version
**
**	(c) Copyright CERN 1991 - See Copyright.html
*/

#define HASH_SIZE 101		/* Arbitrary prime. Memory/speed tradeoff */

#include <HTUtils.h>
#include <HTAnchor.h>
#include <HTParse.h>
#include <UCAux.h>
#include <UCMap.h>

#include <LYCharSets.h>
#include <LYLeaks.h>

#ifdef NOT_DEFINED
/*
 *	This is the hashing function used to determine which list in the
 *		adult_table a parent anchor should be put in.  This is a
 *		much simpler function than the original used.
 */
#define HASH_FUNCTION(cp_address) ((unsigned short int)strlen(cp_address) *\
	(unsigned short int)TOUPPER(*cp_address) % HASH_SIZE)
#endif /* NOT_DEFINED */
/*
 *	This is the original function.	We'll use it again. - FM
 */
PRIVATE int HASH_FUNCTION ARGS1(
	CONST char *,	cp_address)
{
    int hash;
    CONST unsigned char *p;

    for (p = (CONST unsigned char *)cp_address, hash = 0; *p; p++)
	hash = (int) (hash * 3 + (*(CONST unsigned char *)p)) % HASH_SIZE;

    return(hash);
}

typedef struct _HyperDoc Hyperdoc;
#ifdef VMS
struct _HyperDoc {
	int junk;	/* VMS cannot handle pointers to undefined structs */
};
#endif /* VMS */

PRIVATE HTList **adult_table = 0;  /* Point to table of lists of all parents */

/*				Creation Methods
**				================
**
**	Do not use "new" by itself outside this module. In order to enforce
**	consistency, we insist that you furnish more information about the
**	anchor you are creating : use newWithParent or newWithAddress.
*/
PRIVATE HTParentAnchor * HTParentAnchor_new NOARGS
{
    HTParentAnchor *newAnchor =
       (HTParentAnchor *)calloc(1, sizeof(HTParentAnchor));  /* zero-filled */
    if (newAnchor == NULL)
	outofmem(__FILE__, "HTParentAnchor_new");
    newAnchor->parent = newAnchor;
    newAnchor->bookmark = NULL; 	/* Bookmark filename. - FM */
    newAnchor->isISMAPScript = FALSE;	/* Lynx appends ?0,0 if TRUE. - FM */
    newAnchor->isHEAD = FALSE;		/* HEAD request if TRUE. - FM */
    newAnchor->safe = FALSE;		/* Safe. - FM */
    newAnchor->FileCache = NULL;	/* Path to a disk-cached copy. - FM */
    newAnchor->SugFname = NULL; 	/* Suggested filename. - FM */
    newAnchor->RevTitle = NULL; 	/* TITLE for a LINK with REV. - FM */
    newAnchor->cache_control = NULL;	/* Cache-Control. - FM */
    newAnchor->no_cache = FALSE;	/* no-cache? - FM */
    newAnchor->content_type = NULL;	/* Content-Type. - FM */
    newAnchor->content_language = NULL; /* Content-Language. - FM */
    newAnchor->content_encoding = NULL; /* Compression algorithm. - FM */
    newAnchor->content_base = NULL;	/* Content-Base. - FM */
    newAnchor->content_disposition = NULL; /* Content-Disposition. - FM */
    newAnchor->content_location = NULL; /* Content-Location. - FM */
    newAnchor->content_md5 = NULL;	/* Content-MD5. - FM */
    newAnchor->content_length = 0;	/* Content-Length. - FM */
    newAnchor->date = NULL;		/* Date. - FM */
    newAnchor->expires = NULL;		/* Expires. - FM */
    newAnchor->last_modified = NULL;	/* Last-Modified. - FM */
    newAnchor->server = NULL;		/* Server. - FM */
    return(newAnchor);
}

PRIVATE HTChildAnchor * HTChildAnchor_new NOARGS
{
    return (HTChildAnchor *)calloc(1, sizeof(HTChildAnchor)); /* zero-filled */
}


#ifdef CASE_INSENSITIVE_ANCHORS
/*	Case insensitive string comparison
**	----------------------------------
** On entry,
**	s	Points to one string, null terminated
**	t	points to the other.
** On exit,
**	returns YES if the strings are equivalent ignoring case
**		NO if they differ in more than	their case.
*/
PRIVATE BOOL HTEquivalent ARGS2(
	CONST char *,	s,
	CONST char *,	t)
{
    if (s && t) {  /* Make sure they point to something */
	for (; *s && *t; s++, t++) {
	    if (TOUPPER(*s) != TOUPPER(*t)) {
		return(NO);
	    }
	}
	return( TOUPPER(*s) == TOUPPER(*t));
    } else {
	return(s == t); 	/* Two NULLs are equivalent, aren't they ? */
    }
}

#else

/*	Case sensitive string comparison
**	----------------------------------
** On entry,
**	s	Points to one string, null terminated
**	t	points to the other.
** On exit,
**	returns YES if the strings are identical or both NULL
**		NO if they differ.
*/
PRIVATE BOOL HTIdentical ARGS2(
	CONST char *,	s,
	CONST char *,	t)
{
    if (s && t) {  /* Make sure they point to something */
	for (; *s && *t; s++, t++) {
	    if (*s != *t) {
		return(NO);
	    }
	}
	return(*s == *t);
    } else {
	return(s == t); 	/* Two NULLs are identical, aren't they ? */
    }
}
#endif /* CASE_INSENSITIVE_ANCHORS */


/*	Create new or find old sub-anchor
**	---------------------------------
**
**	Me one is for a new anchor being edited into an existing
**	document. The parent anchor must already exist.
*/
PUBLIC HTChildAnchor * HTAnchor_findChild ARGS2(
	HTParentAnchor *,	parent,
	CONST char *,		tag)
{
    HTChildAnchor *child;
    HTList *kids;

    if (!parent) {
	CTRACE(tfp, "HTAnchor_findChild called with NULL parent.\n");
	return(NULL);
    }
    if ((kids = parent->children) != 0) {
	/*
	**  Parent has children.  Search them.
	*/
	if (tag && *tag) {		/* TBL */
	    while (NULL != (child=(HTChildAnchor *)HTList_nextObject(kids))) {
#ifdef CASE_INSENSITIVE_ANCHORS
		if (HTEquivalent(child->tag, tag)) /* Case insensitive */
#else
		if (HTIdentical(child->tag, tag)) /* Case sensitive - FM */
#endif /* CASE_INSENSITIVE_ANCHORS */
		{
		    CTRACE(tfp, "Child anchor %p of parent %p with name `%s' already exists.\n",
				(void *)child, (void *)parent, tag);
		    return(child);
		}
	    }
	}  /*  end if tag is void */
    } else {  /* parent doesn't have any children yet : create family */
	parent->children = HTList_new();
    }

    child = HTChildAnchor_new();
    if (child == NULL)
	outofmem(__FILE__, "HTChildAnchor_new");
    CTRACE(tfp, "new Anchor %p named `%s' is child of %p\n",
		(void *)child,
		tag ? tag : (CONST char *)"",
		(void *)parent); /* int for apollo */
    HTList_addObject (parent->children, child);
    child->parent = parent;
    StrAllocCopy(child->tag, tag);
    return(child);
}


/*	Create or find a child anchor with a possible link
**	--------------------------------------------------
**
**	Create new anchor with a given parent and possibly
**	a name, and possibly a link to a _relatively_ named anchor.
**	(Code originally in ParseHTML.h)
*/
PUBLIC HTChildAnchor * HTAnchor_findChildAndLink ARGS4(
	HTParentAnchor *,	parent, /* May not be 0   */
	CONST char *,		tag,	/* May be "" or 0 */
	CONST char *,		href,	/* May be "" or 0 */
	HTLinkType *,		ltype)	/* May be 0	  */
{
    HTChildAnchor * child = HTAnchor_findChild(parent, tag);

    CTRACE(tfp,"Entered HTAnchor_findChildAndLink\n");

    if (href && *href) {
	char *relative_to = HTAnchor_address((HTAnchor *)parent);
	DocAddress parsed_doc;
	HTAnchor * dest;

	parsed_doc.address = HTParse(href, relative_to, PARSE_ALL);
#ifndef DONT_TRACK_INTERNAL_LINKS
	if (ltype && parent->post_data && ltype == LINK_INTERNAL) {
	    /* for internal links, find a destination with the same
	       post data if the source of the link has post data. - kw */
	    parsed_doc.post_data = parent->post_data;
	    parsed_doc.post_content_type = parent->post_content_type;
	} else
#endif
	{
	    parsed_doc.post_data = NULL;
	    parsed_doc.post_content_type = NULL;
	}
	parsed_doc.bookmark = NULL;
	parsed_doc.isHEAD = FALSE;
	parsed_doc.safe = FALSE;
	dest = HTAnchor_findAddress(&parsed_doc);

#define DUPLICATE_ANCHOR_NAME_WORKAROUND

#ifdef DUPLICATE_ANCHOR_NAME_WORKAROUND
	if (tag && *tag) {
	    HTAnchor *testdest1;
	    int nlinks;
	    testdest1 = child->mainLink.dest;
	    if (testdest1) {
		nlinks = 1 + HTList_count(child->links);
		CTRACE(tfp,
		       "*** Duplicate ChildAnchor %p named `%s' with %d links",
		       child, tag, nlinks);
		if (dest == testdest1 && ltype == child->mainLink.type) {
		    CTRACE(tfp,", same dest %p and type, keeping it\n",
			   testdest1);
		} else {
		    CTRACE(tfp,", different dest %p, creating unnamed child\n",
			   testdest1);
		    child = HTAnchor_findChild(parent, 0);
		}
	    }
	}
#endif
	HTAnchor_link((HTAnchor *)child, dest, ltype);
	FREE(parsed_doc.address);
	FREE(relative_to);
    }
    return(child);
}

/*
**  Function for freeing the adult hash table. - FM
*/
PRIVATE void free_adult_table NOARGS
{
    int i_counter;
    HTList * HTAp_freeme;
    HTParentAnchor * parent;
    /*
     *	Loop through all lists.
     */
    for (i_counter = 0; i_counter < HASH_SIZE; i_counter++) {
	/*
	**  Loop through the list.
	*/
	while (adult_table[i_counter] != NULL) {
	    /*
	    **	Free off items - FM
	    */
	    HTAp_freeme = adult_table[i_counter];
	    adult_table[i_counter] = HTAp_freeme->next;
	    if (HTAp_freeme->object) {
		parent = (HTParentAnchor *)HTAp_freeme->object;
		HTAnchor_delete(parent);
	    }
	    FREE(HTAp_freeme);
	}
    }
    FREE(adult_table);
}

/*	Create new or find old named anchor
**	-----------------------------------
**
**	Me one is for a reference which is found in a document, and might
**	not be already loaded.
**	Note: You are not guaranteed a new anchor -- you might get an old one,
**	like with fonts.
*/
PUBLIC HTAnchor * HTAnchor_findAddress ARGS1(
	CONST DocAddress *,	newdoc)
{
    /* Anchor tag specified ? */
    char *tag = HTParse(newdoc->address, "", PARSE_ANCHOR);

    CTRACE(tfp,"Entered HTAnchor_findAddress\n");

    /*
    **	If the address represents a sub-anchor, we recursively load its
    **	parent, then we create a child anchor within that document.
    */
    if (*tag) {
	DocAddress parsed_doc;
	HTParentAnchor * foundParent;
	HTChildAnchor * foundAnchor;

	parsed_doc.address = HTParse(newdoc->address, "",
		PARSE_ACCESS | PARSE_HOST | PARSE_PATH | PARSE_PUNCTUATION);
	parsed_doc.post_data = newdoc->post_data;
	parsed_doc.post_content_type = newdoc->post_content_type;
	parsed_doc.bookmark = newdoc->bookmark;
	parsed_doc.isHEAD = newdoc->isHEAD;
	parsed_doc.safe = newdoc->safe;

	foundParent = (HTParentAnchor *)HTAnchor_findAddress(&parsed_doc);
	foundAnchor = HTAnchor_findChild (foundParent, tag);
	FREE(parsed_doc.address);
	FREE(tag);
	return (HTAnchor *)foundAnchor;
    } else {
	/*
	**  If the address has no anchor tag,
	**  check whether we have this node.
	*/
	int hash;
	HTList * adults;
	HTList *grownups;
	HTParentAnchor * foundAnchor;

	FREE(tag);

	/*
	**  Select list from hash table,
	*/
	hash = HASH_FUNCTION(newdoc->address);
	if (!adult_table) {
	    adult_table = (HTList **)calloc(HASH_SIZE, sizeof(HTList *));
	    atexit(free_adult_table);
	}
	if (!adult_table[hash])
	    adult_table[hash] = HTList_new();
	adults = adult_table[hash];

	/*
	**  Search list for anchor.
	*/
	grownups = adults;
	while (NULL != (foundAnchor =
			(HTParentAnchor *)HTList_nextObject(grownups))) {
#ifdef CASE_INSENSITIVE_ANCHORS
	    if (HTEquivalent(foundAnchor->address, newdoc->address) &&
		HTEquivalent(foundAnchor->post_data, newdoc->post_data) &&
		foundAnchor->isHEAD == newdoc->isHEAD)
#else
	    if (HTIdentical(foundAnchor->address, newdoc->address) &&
		HTIdentical(foundAnchor->post_data, newdoc->post_data) &&
		foundAnchor->isHEAD == newdoc->isHEAD)
#endif /* CASE_INSENSITIVE_ANCHORS */
	    {
		CTRACE(tfp, "Anchor %p with address `%s' already exists.\n",
			    (void *)foundAnchor, newdoc->address);
		 return (HTAnchor *)foundAnchor;
	     }
	}

	/*
	**  Node not found: create new anchor.
	*/
	foundAnchor = HTParentAnchor_new();
	CTRACE(tfp, "New anchor %p has hash %d and address `%s'\n",
		    (void *)foundAnchor, hash, newdoc->address);
	StrAllocCopy(foundAnchor->address, newdoc->address);
	if (newdoc->post_data)
	    StrAllocCopy(foundAnchor->post_data, newdoc->post_data);
	if (newdoc->post_content_type)
	    StrAllocCopy(foundAnchor->post_content_type,
			 newdoc->post_content_type);
	if (newdoc->bookmark)
	    StrAllocCopy(foundAnchor->bookmark, newdoc->bookmark);
	foundAnchor->isHEAD = newdoc->isHEAD;
	foundAnchor->safe = newdoc->safe;
	HTList_addObject (adults, foundAnchor);
	return (HTAnchor *)foundAnchor;
    }
}


/*	Delete an anchor and possibly related things (auto garbage collection)
**	--------------------------------------------
**
**	The anchor is only deleted if the corresponding document is not loaded.
**	All outgoing links from parent and children are deleted, and this anchor
**	is removed from the sources list of all its targets.
**	We also try to delete the targets whose documents are not loaded.
**	If this anchor's source list is empty, we delete it and its children.
*/
PRIVATE void deleteLinks ARGS1(
	HTAnchor *,	me)
{
    /*
     *	Memory leaks fixed.
     *	05-27-94 Lynx 2-3-1 Garrett Arch Blythe
     */

    /*
     *	Anchor is NULL, do nothing.
     */
    if (!me) {
	return;
    }

    /*
     *	Unregister me with our mainLink destination anchor's parent.
     */
    if (me->mainLink.dest) {
	HTParentAnchor *parent = me->mainLink.dest->parent;

	/*
	 *  Remove me from the parent's sources so that the
	 *  parent knows one less anchor is it's dest.
	 */
	if (!HTList_isEmpty(parent->sources)) {
	    /*
	     *	Really should only need to deregister once.
	     */
	    HTList_removeObject(parent->sources, (void *)me);
	}

	/*
	 *  Test here to avoid calling overhead.
	 *  If the parent has no loaded document, then we should
	 *  tell it to attempt to delete itself.
	 *  Don't do this jass if the anchor passed in is the same
	 *  as the anchor to delete.
	 *  Also, don't do this if the destination parent is our
	 *  parent.
	 */
	if (!parent->document &&
	    parent != (HTParentAnchor *)me &&
	    me->parent != parent) {
	    HTAnchor_delete(parent);
	}

	/*
	 *  At this point, we haven't a mainLink.  Set it to be
	 *  so.
	 *  Leave the HTAtom pointed to by type up to other code to
	 *  handle (reusable, near static).
	 */
	me->mainLink.dest = NULL;
	me->mainLink.type = NULL;
    }

    /*
     *	Check for extra destinations in our links list.
     */
    if (!HTList_isEmpty(me->links)) {
	HTLink *target;
	HTParentAnchor *parent;

	/*
	 *  Take out our extra non mainLinks one by one, calling
	 *  their parents to know that they are no longer
	 *  the destination of me's anchor.
	 */
	while ((target = (HTLink *)HTList_removeLastObject(me->links)) != 0) {
	    parent = target->dest->parent;
	    if (!HTList_isEmpty(parent->sources)) {
		/*
		 *  Only need to tell destination parent
		 *  anchor once.
		 */
		HTList_removeObject(parent->sources, (void *)me);
	    }

	    /*
	     *	Avoid calling overhead.
	     *	If the parent hasn't a loaded document, then
	     *	   we will attempt to have the parent
	     *	   delete itself.
	     *	Don't call twice if this is the same anchor
	     *	   that we are trying to delete.
	     *	Also, don't do this if we are trying to delete
	     *	   our parent.
	     */
	    if (!parent->document &&
		(HTParentAnchor *)me != parent &&
		me->parent != parent) {
		HTAnchor_delete(parent);
	    }
	    /*
	     *	The link structure has to be deleted, too!
	     *	That was missing, but this code probably never
	     *	got exercised by Lynx.	- KW
	     */
	    FREE(target);
	}

	/*
	 *  At this point, me no longer has any destination in
	 *  the links list.  Get rid of it.
	 */
	if (me->links) {
	    HTList_delete(me->links);
	    me->links = NULL;
	}
    }

    /*
     *	Catch in case links list exists but nothing in it.
     */
    if (me->links) {
	HTList_delete(me->links);
	me->links = NULL;
    }
}

PUBLIC BOOL HTAnchor_delete ARGS1(
	HTParentAnchor *,	me)
{
    /*
     *	Memory leaks fixed.
     * 05-27-94 Lynx 2-3-1 Garrett Arch Blythe
     */
    HTList *cur;
    HTChildAnchor *child;

    /*
     *	Do nothing if nothing to do.
     */
    if (!me) {
	return(NO);
    }

    /*
     *	Don't delete if document is loaded or being loaded.
     */
    if (me->document || me->underway) {
	return(NO);
    }

    /*
     *	Recursively try to delete destination anchors of this parent.
     *	In any event, this will tell all destination anchors that we
     *	no longer consider them a destination.
     */
    deleteLinks((HTAnchor *)me);

    /*
     *	There are still incoming links to this one (we are the
     *	destination of another anchor).
     *	Don't actually delete this anchor, but children are OK to
     *	delete their links.
     */
    if (!HTList_isEmpty(me->sources)) {
	/*
	 *  Delete all outgoing links from children, do not
	 *  delete the children, though.
	 */
	if (!HTList_isEmpty(me->children)) {
	    cur = me->children;
	    while ((child = (HTChildAnchor *)HTList_nextObject(cur)) != 0) {
		if (child != NULL) {
		    deleteLinks((HTAnchor *)child);
		}
	    }
	}

	/*
	 *  Can't delete parent, still have sources.
	 */
	return(NO);
    }

    /*
     *	No more incoming links : kill everything
     *	First, recursively delete children and their links.
     */
    if (!HTList_isEmpty(me->children)) {
	while ((child = (HTChildAnchor *)HTList_removeLastObject(
							me->children)) != 0) {
	    if (child) {
		deleteLinks((HTAnchor *)child);
		if (child->tag) {
		    FREE(child->tag);
		}
		FREE(child);
	    }
	}
    }

    /*
     *	Delete our empty list of children.
     */
    if (me->children) {
	HTList_delete(me->children);
	me->children = NULL;
    }

    /*
     * Delete our empty list of sources.
     */
    if (me->sources) {
	HTList_delete(me->sources);
	me->sources = NULL;
    }

    /*
     *	Delete the methods list.
     */
    if (me->methods) {
	/*
	 *  Leave what the methods point to up in memory for
	 *  other code (near static stuff).
	 */
	HTList_delete(me->methods);
	me->methods = NULL;
    }

    /*
     *	Free up all allocated members.
     */
    FREE(me->charset);
    FREE(me->isIndexAction);
    FREE(me->isIndexPrompt);
    FREE(me->title);
    FREE(me->physical);
    FREE(me->post_data);
    FREE(me->post_content_type);
    FREE(me->bookmark);
    FREE(me->owner);
    FREE(me->RevTitle);
    if (me->FileCache) {
	FILE *fd;
	if ((fd = fopen(me->FileCache, "r")) != NULL) {
	    fclose(fd);
	    remove(me->FileCache);
	}
	FREE(me->FileCache);
    }
    FREE(me->SugFname);
    FREE(me->cache_control);
    FREE(me->content_type);
    FREE(me->content_language);
    FREE(me->content_encoding);
    FREE(me->content_base);
    FREE(me->content_disposition);
    FREE(me->content_location);
    FREE(me->content_md5);
    FREE(me->date);
    FREE(me->expires);
    FREE(me->last_modified);
    FREE(me->server);
#ifdef USE_HASH
    FREE(me->style);
#endif

    /*
     *	Remove ourselves from the hash table's list.
     */
    if (adult_table) {
	unsigned short int usi_hash = HASH_FUNCTION(me->address);

	if (adult_table[usi_hash])  {
	    HTList_removeObject(adult_table[usi_hash], (void *)me);
	}
    }

    /*
     *	Original code wanted a way to clean out the HTFormat if no
     *	longer needed (ref count?).  I'll leave it alone since
     *	those HTAtom objects are a little harder to know where
     *	they are being referenced all at one time. (near static)
     */

    /*
     *	Free the address.
     */
    FREE(me->address);

    FREE (me->UCStages);
    ImageMapList_free(me->imaps);


    /*
     *	Finally, kill the parent anchor passed in.
     */
    FREE(me);

    return(YES);
}


/*		Move an anchor to the head of the list of its siblings
**		------------------------------------------------------
**
**	This is to ensure that an anchor which might have already existed
**	is put in the correct order as we load the document.
*/
PUBLIC void HTAnchor_makeLastChild ARGS1(
	HTChildAnchor *,	me)
{
    if (me->parent != (HTParentAnchor *)me) {  /* Make sure it's a child */
	HTList * siblings = me->parent->children;
	HTList_removeObject (siblings, me);
	HTList_addObject (siblings, me);
    }
}

/*	Data access functions
**	---------------------
*/
PUBLIC HTParentAnchor * HTAnchor_parent ARGS1(
	HTAnchor *,	me)
{
    return( me ? me->parent : NULL);
}

PUBLIC void HTAnchor_setDocument ARGS2(
	HTParentAnchor *,	me,
	HyperDoc *,		doc)
{
    if (me)
	me->document = doc;
}

PUBLIC HyperDoc * HTAnchor_document ARGS1(
	HTParentAnchor *,	me)
{
    return( me ? me->document : NULL);
}


/*  We don't want code to change an address after anchor creation... yet ?
PUBLIC void HTAnchor_setAddress ARGS2(
	HTAnchor *,	me,
	char *, 	addr)
{
    if (me)
	StrAllocCopy (me->parent->address, addr);
}
*/

PUBLIC char * HTAnchor_address ARGS1(
	HTAnchor *,	me)
{
    char *addr = NULL;

    if (me) {
	if (((HTParentAnchor *)me == me->parent) ||
	    !((HTChildAnchor *)me)->tag) {  /* it's an adult or no tag */
	    StrAllocCopy(addr, me->parent->address);
	} else {  /* it's a named child */
	    addr = malloc(2 +
			  strlen(me->parent->address) +
			  strlen(((HTChildAnchor *)me)->tag));
	    if (addr == NULL)
		outofmem(__FILE__, "HTAnchor_address");
	    sprintf(addr, "%s#%s",
			   me->parent->address, ((HTChildAnchor *)me)->tag);
	}
    }
    return(addr);
}

PUBLIC void HTAnchor_setFormat ARGS2(
	HTParentAnchor *,	me,
	HTFormat,		form)
{
    if (me)
	me->format = form;
}

PUBLIC HTFormat HTAnchor_format ARGS1(
	HTParentAnchor *,	me)
{
    return( me ? me->format : NULL);
}

PUBLIC void HTAnchor_setIndex ARGS2(
	HTParentAnchor *,	me,
	char *, 		address)
{
    if (me) {
	me->isIndex = YES;
	StrAllocCopy(me->isIndexAction, address);
    }
}

PUBLIC void HTAnchor_setPrompt ARGS2(
	HTParentAnchor *,	me,
	char *, 		prompt)
{
    if (me) {
	StrAllocCopy(me->isIndexPrompt, prompt);
    }
}

PUBLIC BOOL HTAnchor_isIndex ARGS1(
	HTParentAnchor *,	me)
{
    return( me ? me->isIndex : NO);
}

/*	Whether Anchor has been designated as an ISMAP link
**	(normally by presence of an ISMAP attribute on A or IMG) - KW
*/
PUBLIC BOOL HTAnchor_isISMAPScript ARGS1(
	HTAnchor *,	me)
{
    return( me ? me->parent->isISMAPScript : NO);
}

PUBLIC BOOL HTAnchor_hasChildren ARGS1(
	HTParentAnchor *,	me)
{
    return( me ? ! HTList_isEmpty(me->children) : NO);
}

#if defined(USE_HASH)
/*	Style handling.
*/
PUBLIC CONST char * HTAnchor_style ARGS1(
	HTParentAnchor *,	me)
{
	return( me ? me->style : NULL);
}

PUBLIC void HTAnchor_setStyle ARGS2(
	HTParentAnchor *,	me,
	CONST char *,		style)
{
    if (me) {
	StrAllocCopy(me->style, style);
    }
}
#endif


/*	Title handling.
*/
PUBLIC CONST char * HTAnchor_title ARGS1(
	HTParentAnchor *,	me)
{
    return( me ? me->title : NULL);
}

PUBLIC void HTAnchor_setTitle ARGS2(
	HTParentAnchor *,	me,
	CONST char *,		title)
{
    int i;

    if (me) {
	StrAllocCopy(me->title, title);
	for (i = 0; me->title[i]; i++) {
	    if ((unsigned char)me->title[i] == 1 ||
		(unsigned char)me->title[i] == 2) {
		me->title[i] = ' ';
	    }
	}
    }
}

PUBLIC void HTAnchor_appendTitle ARGS2(
	HTParentAnchor *,	me,
	CONST char *,		title)
{
    int i;

    if (me) {
	StrAllocCat(me->title, title);
	for (i = 0; me->title[i]; i++) {
	    if ((unsigned char)me->title[i] == 1 ||
		(unsigned char)me->title[i] == 2) {
		me->title[i] = ' ';
	    }
	}
    }
}

/*	Bookmark handling.
*/
PUBLIC CONST char * HTAnchor_bookmark ARGS1(
	HTParentAnchor *,	me)
{
    return( me ? me->bookmark : NULL);
}

PUBLIC void HTAnchor_setBookmark ARGS2(
	HTParentAnchor *,	me,
	CONST char *,		bookmark)
{
    if (me)
	StrAllocCopy(me->bookmark, bookmark);
}

/*	Owner handling.
*/
PUBLIC CONST char * HTAnchor_owner ARGS1(
	HTParentAnchor *,	me)
{
    return( me ? me->owner : NULL);
}

PUBLIC void HTAnchor_setOwner ARGS2(
	HTParentAnchor *,	me,
	CONST char *,		owner)
{
    if (me) {
	StrAllocCopy(me->owner, owner);
    }
}

/*	TITLE handling in LINKs with REV="made" or REV="owner". - FM
*/
PUBLIC CONST char * HTAnchor_RevTitle ARGS1(
	HTParentAnchor *,	me)
{
    return( me ? me->RevTitle : NULL);
}

PUBLIC void HTAnchor_setRevTitle ARGS2(
	HTParentAnchor *,	me,
	CONST char *,		title)
{
    int i;

    if (me) {
	StrAllocCopy(me->RevTitle, title);
	for (i = 0; me->RevTitle[i]; i++) {
	    if ((unsigned char)me->RevTitle[i] == 1 ||
		(unsigned char)me->RevTitle[i] == 2) {
		me->RevTitle[i] = ' ';
	    }
	}
    }
}

/*	Suggested filename handling. - FM
**	(will be loaded if we had a Content-Disposition
**	 header or META element with filename=name.suffix)
*/
PUBLIC CONST char * HTAnchor_SugFname ARGS1(
	HTParentAnchor *,	me)
{
    return( me ? me->SugFname : NULL);
}

/*	Content-Encoding handling. - FM
**	(will be loaded if we had a Content-Encoding
**	 header.)
*/
PUBLIC CONST char * HTAnchor_content_encoding ARGS1(
	HTParentAnchor *,	me)
{
    return( me ? me->content_encoding : NULL);
}

/*	Content-Type handling. - FM
*/
PUBLIC CONST char * HTAnchor_content_type ARGS1(
	HTParentAnchor *,	me)
{
    return( me ? me->content_type : NULL);
}

/*	Last-Modified header handling. - FM
*/
PUBLIC CONST char * HTAnchor_last_modified ARGS1(
	HTParentAnchor *,	me)
{
    return( me ? me->last_modified : NULL);
}

/*	Date header handling. - FM
*/
PUBLIC CONST char * HTAnchor_date ARGS1(
	HTParentAnchor *,	me)
{
    return( me ? me->date : NULL);
}

/*	Server header handling. - FM
*/
PUBLIC CONST char * HTAnchor_server ARGS1(
	HTParentAnchor *,	me)
{
    return( me ? me->server : NULL);
}

/*	Safe header handling. - FM
*/
PUBLIC BOOL HTAnchor_safe ARGS1(
	HTParentAnchor *,	me)
{
    return( me ? me->safe : FALSE);
}

/*	Content-Base header handling. - FM
*/
PUBLIC CONST char * HTAnchor_content_base ARGS1(
	HTParentAnchor *,	me)
{
    return( me ? me->content_base : NULL);
}

/*	Content-Location header handling. - FM
*/
PUBLIC CONST char * HTAnchor_content_location ARGS1(
	HTParentAnchor *,	me)
{
    return( me ? me->content_location : NULL);
}

/*	Link me Anchor to another given one
**	-------------------------------------
*/
PUBLIC BOOL HTAnchor_link ARGS3(
	HTAnchor *,	source,
	HTAnchor *,	destination,
	HTLinkType *,	type)
{
    if (!(source && destination))
	return(NO);  /* Can't link to/from non-existing anchor */
    CTRACE(tfp, "Linking anchor %p to anchor %p\n", source, destination);
    if (!source->mainLink.dest) {
	source->mainLink.dest = destination;
	source->mainLink.type = type;
    } else {
	HTLink * newLink = (HTLink *)calloc (1, sizeof (HTLink));
	if (newLink == NULL)
	    outofmem(__FILE__, "HTAnchor_link");
	newLink->dest = destination;
	newLink->type = type;
	if (!source->links)
	    source->links = HTList_new();
	HTList_addObject (source->links, newLink);
    }
    if (!destination->parent->sources)
	destination->parent->sources = HTList_new();
    HTList_addObject (destination->parent->sources, source);
    return(YES);  /* Success */
}


/*	Manipulation of links
**	---------------------
*/
PUBLIC HTAnchor * HTAnchor_followMainLink ARGS1(
	HTAnchor *,	me)
{
    return( me->mainLink.dest);
}

PUBLIC HTAnchor * HTAnchor_followTypedLink ARGS2(
	HTAnchor *,	me,
	HTLinkType *,	type)
{
    if (me->mainLink.type == type)
	return( me->mainLink.dest);
    if (me->links) {
	HTList *links = me->links;
	HTLink *the_link;
	while (NULL != (the_link=(HTLink *)HTList_nextObject(links))) {
	    if (the_link->type == type) {
		return( the_link->dest);
	    }
	}
    }
    return(NULL);  /* No link of me type */
}


/*	Make main link
*/
PUBLIC BOOL HTAnchor_makeMainLink ARGS2(
	HTAnchor *,	me,
	HTLink *,	movingLink)
{
    /* Check that everything's OK */
    if (!(me && HTList_removeObject (me->links, movingLink))) {
	return(NO);  /* link not found or NULL anchor */
    } else {
	/* First push current main link onto top of links list */
	HTLink *newLink = (HTLink *)calloc (1, sizeof (HTLink));
	if (newLink == NULL)
	    outofmem(__FILE__, "HTAnchor_makeMainLink");
	memcpy((void *)newLink,
	       (CONST char *)&me->mainLink, sizeof (HTLink));
	HTList_addObject (me->links, newLink);

	/* Now make movingLink the new main link, and free it */
	memcpy((void *)&me->mainLink,
	       (CONST void *)movingLink, sizeof (HTLink));
	FREE(movingLink);
	return(YES);
    }
}


/*	Methods List
**	------------
*/
PUBLIC HTList * HTAnchor_methods ARGS1(
	HTParentAnchor *,	me)
{
    if (!me->methods) {
	me->methods = HTList_new();
    }
    return( me->methods);
}

/*	Protocol
**	--------
*/
PUBLIC void * HTAnchor_protocol ARGS1(
	HTParentAnchor *,	me)
{
    return( me->protocol);
}

PUBLIC void HTAnchor_setProtocol ARGS2(
	HTParentAnchor *,	me,
	void*,			protocol)
{
    me->protocol = protocol;
}

/*	Physical Address
**	----------------
*/
PUBLIC char * HTAnchor_physical ARGS1(
	HTParentAnchor *,	me)
{
    return( me->physical);
}

PUBLIC void HTAnchor_setPhysical ARGS2(
	HTParentAnchor *,	me,
	char *, 		physical)
{
    if (me) {
	StrAllocCopy(me->physical, physical);
    }
}

/*
**  We store charset info in the HTParentAnchor object, for several
**  "stages".  (See UCDefs.h)
**  A stream method is supposed to know what stage in the model it is.
**
**  General model	MIME	 ->  parser  ->  structured  ->  HText
**  e.g., text/html
**	from HTTP:	HTMIME.c ->  SGML.c  ->  HTML.c      ->  GridText.c
**     text/plain
**	from file:	HTFile.c ->  HTPlain.c		     ->  GridText.c
**
**  The lock/set_by is used to lock e.g. a charset set by an explicit
**  HTTP MIME header against overriding by a HTML META tag - the MIME
**  header has higher priority.  Defaults (from -assume_.. options etc.)
**  will not override charset explicitly given by server.
**
**  Some advantages of keeping this in the HTAnchor:
**  - Global variables are bad.
**  - Can remember a charset given by META tag when toggling to SOURCE view.
**  - Can remember a charset given by <A CHARSET=...> href in another doc.
**
**  We don't modify the HTParentAnchor's charset element
**  here, that one will only be set when explicitly given.
*/
PUBLIC LYUCcharset * HTAnchor_getUCInfoStage ARGS2(
	HTParentAnchor *,	me,
	int,			which_stage)
{
    if (me && !me->UCStages) {
	int i;
	int chndl = UCLYhndl_for_unspec;  /* always >= 0 */
	UCAnchorInfo * stages = (UCAnchorInfo*)calloc(1,
						      sizeof(UCAnchorInfo));
	if (stages == NULL)
	    outofmem(__FILE__, "HTAnchor_getUCInfoStage");
	for (i = 0; i < UCT_STAGEMAX; i++) {
	    stages->s[i].C.MIMEname = "";
	    stages->s[i].LYhndl = -1;
	}
	if (me->charset) {
	    chndl = UCGetLYhndl_byMIME(me->charset);
	    if (chndl < 0)
		chndl = UCLYhndl_for_unrec;
	    if (chndl < 0)
		/*
		**  UCLYhndl_for_unrec not defined :-(
		**  fallback to UCLYhndl_for_unspec which always valid.
		*/
		chndl = UCLYhndl_for_unspec;  /* always >= 0 */
	}
	memcpy(&stages->s[UCT_STAGE_MIME].C, &LYCharSet_UC[chndl],
	       sizeof(LYUCcharset));
	stages->s[UCT_STAGE_MIME].lock = UCT_SETBY_DEFAULT;
	stages->s[UCT_STAGE_MIME].LYhndl = chndl;
	me->UCStages = stages;
    }
    if (me) {
	return( &me->UCStages->s[which_stage].C);
    }
    return(NULL);
}

PUBLIC int HTAnchor_getUCLYhndl ARGS2(
	HTParentAnchor *,	me,
	int,			which_stage)
{
    if (me) {
	if (!me->UCStages) {
	    /*
	     *	This will allocate and initialize, if not yet done.
	     */
	    (void) HTAnchor_getUCInfoStage(me, which_stage);
	}
	if (me->UCStages->s[which_stage].lock > UCT_SETBY_NONE) {
	    return( me->UCStages->s[which_stage].LYhndl);
	}
    }
    return( -1);
}

PUBLIC LYUCcharset * HTAnchor_setUCInfoStage ARGS4(
	HTParentAnchor *,	me,
	int,			LYhndl,
	int,			which_stage,
	int,			set_by)
{
    if (me) {
	/*
	 *  This will allocate and initialize, if not yet done.
	 */
	LYUCcharset * p = HTAnchor_getUCInfoStage(me, which_stage);
	/*
	 *  Can we override?
	 */
	if (set_by >= me->UCStages->s[which_stage].lock) {
	    me->UCStages->s[which_stage].lock = set_by;
	    me->UCStages->s[which_stage].LYhndl = LYhndl;
	    if (LYhndl >= 0) {
		memcpy(p, &LYCharSet_UC[LYhndl], sizeof(LYUCcharset));
	    }
	    else {
		p->UChndl = -1;
	    }
	    return(p);
	}
    }
    return(NULL);
}

PUBLIC LYUCcharset * HTAnchor_resetUCInfoStage ARGS4(
	HTParentAnchor *,	me,
	int,			LYhndl,
	int,			which_stage,
	int,			set_by)
{
    if (!me || !me->UCStages)
	return(NULL);
    me->UCStages->s[which_stage].lock = set_by;
    me->UCStages->s[which_stage].LYhndl = LYhndl;
    return( &me->UCStages->s[which_stage].C);
}

/*
**  A set_by of (-1) means use the lock value from the from_stage.
*/
PUBLIC LYUCcharset * HTAnchor_copyUCInfoStage ARGS4(
	HTParentAnchor *,	me,
	int,			to_stage,
	int,			from_stage,
	int,			set_by)
{
    if (me) {
	/*
	 *  This will allocate and initialize, if not yet done.
	 */
	LYUCcharset * p_from = HTAnchor_getUCInfoStage(me, from_stage);
	LYUCcharset * p_to = HTAnchor_getUCInfoStage(me, to_stage);
	/*
	 *  Can we override?
	 */
	if (set_by == -1)
	    set_by = me->UCStages->s[from_stage].lock;
	if (set_by == UCT_SETBY_NONE)
	    set_by = UCT_SETBY_DEFAULT;
	if (set_by >= me->UCStages->s[to_stage].lock) {
	    me->UCStages->s[to_stage].lock = set_by;
	    me->UCStages->s[to_stage].LYhndl =
		me->UCStages->s[from_stage].LYhndl;
	    if (p_to != p_from)
		memcpy(p_to, p_from, sizeof(LYUCcharset));
	    return(p_to);
	}
    }
    return(NULL);
}