summaryrefslogtreecommitdiffstats
path: root/modules/mappers/mod_imagemap.c
blob: 187a500a5d2256f8f4901d51c70cf137729cb8d4 (plain)
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
/* Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/*
 * This imagemap module started as a port of the original imagemap.c
 * written by Rob McCool (11/13/93 robm@ncsa.uiuc.edu).
 * This version includes the mapping algorithms found in version 1.3
 * of imagemap.c.
 *
 * Contributors to this code include:
 *
 * Kevin Hughes, kevinh@pulua.hcc.hawaii.edu
 *
 * Eric Haines, erich@eye.com
 * "macmartinized" polygon code copyright 1992 by Eric Haines, erich@eye.com
 *
 * Randy Terbush, randy@zyzzyva.com
 * port to Apache module format, "base_uri" and support for relative URLs
 *
 * James H. Cloos, Jr., cloos@jhcloos.com
 * Added point datatype, using code in NCSA's version 1.8 imagemap.c
 * program, as distributed with version 1.4.1 of their server.
 * The point code is originally added by Craig Milo Rogers, Rogers@ISI.Edu
 *
 * Nathan Kurz, nate@tripod.com
 * Rewrite/reorganization.  New handling of default, base and relative URLs.
 * New Configuration directives:
 *    ImapMenu {none, formatted, semiformatted, unformatted}
 *    ImapDefault {error, nocontent, referer, menu, URL}
 *    ImapBase {map, referer, URL}
 * Support for creating non-graphical menu added.  (backwards compatible):
 *    Old:  directive URL [x,y ...]
 *    New:  directive URL "Menu text" [x,y ...]
 *     or:  directive URL x,y ... "Menu text"
 * Map format and menu concept courtesy Joshua Bell, jsbell@acs.ucalgary.ca.
 *
 * Mark Cox, mark@ukweb.com, Allow relative URLs even when no base specified
 */

#include "apr.h"
#include "apr_strings.h"
#include "apr_lib.h"

#define APR_WANT_STDIO          /* for sscanf() */
#define APR_WANT_STRFUNC
#include "apr_want.h"

#include "ap_config.h"
#include "httpd.h"
#include "http_config.h"
#include "http_request.h"
#include "http_core.h"
#include "http_protocol.h"
#include "http_main.h"
#include "http_log.h"
#include "util_script.h"
#include "mod_core.h"


#define IMAP_MAGIC_TYPE "application/x-httpd-imap"
#define MAXVERTS 100
#define X 0
#define Y 1

#define IMAP_MENU_DEFAULT "formatted"
#define IMAP_DEFAULT_DEFAULT "nocontent"
#define IMAP_BASE_DEFAULT "map"

module AP_MODULE_DECLARE_DATA imagemap_module;

typedef struct {
    char *imap_menu;
    char *imap_default;
    char *imap_base;
} imap_conf_rec;

static void *create_imap_dir_config(apr_pool_t *p, char *dummy)
{
    imap_conf_rec *icr =
    (imap_conf_rec *) apr_palloc(p, sizeof(imap_conf_rec));

    icr->imap_menu = NULL;
    icr->imap_default = NULL;
    icr->imap_base = NULL;

    return icr;
}

static void *merge_imap_dir_configs(apr_pool_t *p, void *basev, void *addv)
{
    imap_conf_rec *new = (imap_conf_rec *) apr_palloc(p, sizeof(imap_conf_rec));
    imap_conf_rec *base = (imap_conf_rec *) basev;
    imap_conf_rec *add = (imap_conf_rec *) addv;

    new->imap_menu = add->imap_menu ? add->imap_menu : base->imap_menu;
    new->imap_default = add->imap_default ? add->imap_default
                                          : base->imap_default;
    new->imap_base = add->imap_base ? add->imap_base : base->imap_base;

    return new;
}


static const command_rec imap_cmds[] =
{
    AP_INIT_TAKE1("ImapMenu", ap_set_string_slot,
                  (void *)APR_OFFSETOF(imap_conf_rec, imap_menu), OR_INDEXES,
                  "the type of menu generated: none, formatted, semiformatted, "
                  "unformatted"),
    AP_INIT_TAKE1("ImapDefault", ap_set_string_slot,
                  (void *)APR_OFFSETOF(imap_conf_rec, imap_default), OR_INDEXES,
                  "the action taken if no match: error, nocontent, referer, "
                  "menu, URL"),
    AP_INIT_TAKE1("ImapBase", ap_set_string_slot,
                  (void *)APR_OFFSETOF(imap_conf_rec, imap_base), OR_INDEXES,
                  "the base for all URL's: map, referer, URL (or start of)"),
    {NULL}
};

static int pointinrect(const double point[2], double coords[MAXVERTS][2])
{
    double max[2], min[2];
    if (coords[0][X] > coords[1][X]) {
        max[0] = coords[0][X];
        min[0] = coords[1][X];
    }
    else {
        max[0] = coords[1][X];
        min[0] = coords[0][X];
    }

    if (coords[0][Y] > coords[1][Y]) {
        max[1] = coords[0][Y];
        min[1] = coords[1][Y];
    }
    else {
        max[1] = coords[1][Y];
        min[1] = coords[0][Y];
    }

    return ((point[X] >= min[0] && point[X] <= max[0]) &&
            (point[Y] >= min[1] && point[Y] <= max[1]));
}

static int pointincircle(const double point[2], double coords[MAXVERTS][2])
{
    double radius1, radius2;

    radius1 = ((coords[0][Y] - coords[1][Y]) * (coords[0][Y] - coords[1][Y]))
        + ((coords[0][X] - coords[1][X]) * (coords[0][X] - coords[1][X]));

    radius2 = ((coords[0][Y] - point[Y]) * (coords[0][Y] - point[Y]))
        + ((coords[0][X] - point[X]) * (coords[0][X] - point[X]));

    return (radius2 <= radius1);
}

#define fmin(a,b) (((a)>(b))?(b):(a))
#define fmax(a,b) (((a)>(b))?(a):(b))

static int pointinpoly(const double point[2], double pgon[MAXVERTS][2])
{
    int i, numverts, crossings = 0;
    double x = point[X], y = point[Y];

    for (numverts = 0; numverts < MAXVERTS && pgon[numverts][X] != -1;
        numverts++) {
        /* just counting the vertexes */
    }

    for (i = 0; i < numverts; i++) {
        double x1=pgon[i][X];
        double y1=pgon[i][Y];
        double x2=pgon[(i + 1) % numverts][X];
        double y2=pgon[(i + 1) % numverts][Y];
        double d=(y - y1) * (x2 - x1) - (x - x1) * (y2 - y1);

        if ((y1 >= y) != (y2 >= y)) {
            crossings +=y2 - y1 >= 0 ? d >= 0 : d <= 0;
        }
        if (!d && fmin(x1,x2) <= x && x <= fmax(x1,x2)
            && fmin(y1,y2) <= y && y <= fmax(y1,y2)) {
            return 1;
        }
    }
    return crossings & 0x01;
}


static int is_closer(const double point[2], double coords[MAXVERTS][2],
                     double *closest)
{
    double dist_squared = ((point[X] - coords[0][X])
                           * (point[X] - coords[0][X]))
                          + ((point[Y] - coords[0][Y])
                             * (point[Y] - coords[0][Y]));

    if (point[X] < 0 || point[Y] < 0) {
        return (0);          /* don't mess around with negative coordinates */
    }

    if (*closest < 0 || dist_squared < *closest) {
        *closest = dist_squared;
        return (1);          /* if this is the first point or is the closest yet
                                set 'closest' equal to this distance^2 */
    }

    return (0);              /* if it's not the first or closest */

}

static double get_x_coord(const char *args)
{
    char *endptr;               /* we want it non-null */
    double x_coord = -1;        /* -1 is returned if no coordinate is given */

    if (args == NULL) {
        return (-1);            /* in case we aren't passed anything */
    }

    while (*args && !apr_isdigit(*args) && *args != ',') {
        args++;                 /* jump to the first digit, but not past
                                   a comma or end */
    }

    x_coord = strtod(args, &endptr);

    if (endptr > args) {        /* if a conversion was made */
        return (x_coord);
    }

    return (-1);                /* else if no conversion was made,
                                   or if no args was given */
}

static double get_y_coord(const char *args)
{
    char *endptr;               /* we want it non-null */
    const char *start_of_y = NULL;
    double y_coord = -1;        /* -1 is returned on error */

    if (args == NULL) {
        return (-1);            /* in case we aren't passed anything */
    }

    start_of_y = ap_strchr_c(args, ',');     /* the comma */

    if (start_of_y) {

        start_of_y++;           /* start looking at the character after
                                   the comma */

        while (*start_of_y && !apr_isdigit(*start_of_y)) {
            start_of_y++;       /* jump to the first digit, but not
                                   past the end */
        }

        y_coord = strtod(start_of_y, &endptr);

        if (endptr > start_of_y) {
            return (y_coord);
        }
    }

    return (-1);                /* if no conversion was made, or
                                   no comma was found in args */
}


/* See if string has a "quoted part", and if so set *quoted_part to
 * the first character of the quoted part, then hammer a \0 onto the
 * trailing quote, and set *string to point at the first character
 * past the second quote.
 *
 * Otherwise set *quoted_part to NULL, and leave *string alone.
 */
static void read_quoted(char **string, char **quoted_part)
{
    char *strp = *string;

    /* assume there's no quoted part */
    *quoted_part = NULL;

    while (apr_isspace(*strp)) {
        strp++;                 /* go along string until non-whitespace */
    }

    if (*strp == '"') {         /* if that character is a double quote */
        strp++;                 /* step over it */
        *quoted_part = strp;    /* note where the quoted part begins */

        while (*strp && *strp != '"') {
            ++strp;             /* skip the quoted portion */
        }

        *strp = '\0';           /* end the string with a NUL */

        strp++;                 /* step over the last double quote */
        *string = strp;
    }
}

/*
 * returns the mapped URL or NULL.
 */
static const char *imap_url(request_rec *r, const char *base, const char *value)
{
/* translates a value into a URL. */
    int slen, clen;
    char *string_pos = NULL;
    const char *string_pos_const = NULL;
    char *directory = NULL;
    const char *referer = NULL;
    char *my_base;

    if (!strcasecmp(value, "map") || !strcasecmp(value, "menu")) {
        return ap_construct_url(r->pool, r->uri, r);
    }

    if (!strcasecmp(value, "nocontent") || !strcasecmp(value, "error")) {
        return apr_pstrdup(r->pool, value);      /* these are handled elsewhere,
                                                so just copy them */
    }

    if (!strcasecmp(value, "referer")) {
        referer = apr_table_get(r->headers_in, "Referer");
        if (referer && *referer) {
            return referer;
        }
        else {
            /* XXX:  This used to do *value = '\0'; ... which is totally bogus
             * because it hammers the passed in value, which can be a string
             * constant, or part of a config, or whatever.  Total garbage.
             * This works around that without changing the rest of this
             * code much
             */
            value = "";      /* if 'referer' but no referring page,
                                null the value */
        }
    }

    string_pos_const = value;
    while (apr_isalpha(*string_pos_const)) {
        string_pos_const++;           /* go along the URL from the map
                                         until a non-letter */
    }
    if (*string_pos_const == ':') {
        /* if letters and then a colon (like http:) */
        /* it's an absolute URL, so use it! */
        return apr_pstrdup(r->pool, value);
    }

    if (!base || !*base) {
        if (value && *value) {
            return apr_pstrdup(r->pool, value); /* no base: use what is given */
        }
        /* no base, no value: pick a simple default */
        return ap_construct_url(r->pool, "/", r);
    }

    /* must be a relative URL to be combined with base */
    if (ap_strchr_c(base, '/') == NULL && (!strncmp(value, "../", 3)
        || !strcmp(value, ".."))) {
        ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(00677)
                    "invalid base directive in map file: %s", r->uri);
        return NULL;
    }
    my_base = apr_pstrdup(r->pool, base);
    string_pos = my_base;
    while (*string_pos) {
        if (*string_pos == '/' && *(string_pos + 1) == '/') {
            string_pos += 2;    /* if there are two slashes, jump over them */
            continue;
        }
        if (*string_pos == '/') {       /* the first single slash */
            if (value[0] == '/') {
                *string_pos = '\0';
            }                   /* if the URL from the map starts from root,
                                   end the base URL string at the first single
                                   slash */
            else {
                directory = string_pos;         /* save the start of
                                                   the directory portion */

                string_pos = strrchr(string_pos, '/');  /* now reuse
                                                           string_pos */
                string_pos++;   /* step over that last slash */
                *string_pos = '\0';
            }                   /* but if the map url is relative, leave the
                                   slash on the base (if there is one) */
            break;
        }
        string_pos++;           /* until we get to the end of my_base without
                                   finding a slash by itself */
    }

    while (!strncmp(value, "../", 3) || !strcmp(value, "..")) {

        if (directory && (slen = strlen(directory))) {

            /* for each '..',  knock a directory off the end
               by ending the string right at the last slash.
               But only consider the directory portion: don't eat
               into the server name.  And only try if a directory
               portion was found */

            clen = slen - 1;

            while ((slen - clen) == 1) {

                if ((string_pos = strrchr(directory, '/'))) {
                    *string_pos = '\0';
                }
                clen = strlen(directory);
                if (clen == 0) {
                    break;
                }
            }

            value += 2;         /* jump over the '..' that we found in the
                                   value */
        }
        else if (directory) {
            ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(00678)
                        "invalid directory name in map file: %s", r->uri);
            return NULL;
        }

        if (!strncmp(value, "/../", 4) || !strcmp(value, "/..")) {
            value++;            /* step over the '/' if there are more '..'
                                   to do.  This way, we leave the starting
                                   '/' on value after the last '..', but get
                                   rid of it otherwise */
        }

    }                           /* by this point, value does not start
                                   with '..' */

    if (value && *value) {
        return apr_pstrcat(r->pool, my_base, value, NULL);
    }
    return my_base;
}

static int imap_reply(request_rec *r, const char *redirect)
{
    if (!strcasecmp(redirect, "error")) {
        /* they actually requested an error! */
        return HTTP_INTERNAL_SERVER_ERROR;
    }
    if (!strcasecmp(redirect, "nocontent")) {
        /* tell the client to keep the page it has */
        return HTTP_NO_CONTENT;
    }
    if (redirect && *redirect) {
        /* must be a URL, so redirect to it */
        apr_table_setn(r->headers_out, "Location", redirect);
        return HTTP_MOVED_TEMPORARILY;
    }
    return HTTP_INTERNAL_SERVER_ERROR;
}

static void menu_header(request_rec *r, char *menu)
{
    ap_set_content_type(r, "text/html; charset=ISO-8859-1");

    ap_rvputs(r, DOCTYPE_HTML_3_2, "<html><head>\n<title>Menu for ",
              ap_escape_html(r->pool, r->uri),
              "</title>\n</head><body>\n", NULL);

    if (!strcasecmp(menu, "formatted")) {
        ap_rvputs(r, "<h1>Menu for ",
                  ap_escape_html(r->pool, r->uri),
                  "</h1>\n<hr />\n\n", NULL);
    }
}

static void menu_blank(request_rec *r, char *menu)
{
    if (!strcasecmp(menu, "formatted")) {
        ap_rputs("\n", r);
    }
    else if (!strcasecmp(menu, "semiformatted")) {
        ap_rputs("<br />\n", r);
    }
    else if (!strcasecmp(menu, "unformatted")) {
        ap_rputs("\n", r);
    }
}

static void menu_comment(request_rec *r, char *menu, char *comment)
{
    /* comments are ignored in the 'formatted' form */
    if (!strcasecmp(menu, "formatted")) {
        ap_rputs("\n", r);         /* print just a newline if 'formatted' */
    }
    else if (!strcasecmp(menu, "semiformatted") && *comment) {
        ap_rvputs(r, comment, "\n", NULL);
    }
    else if (!strcasecmp(menu, "unformatted") && *comment) {
        ap_rvputs(r, comment, "\n", NULL);
    }
}

static void menu_default(request_rec *r, const char *menu, const char *href, const char *text)
{
    char *ehref, *etext;
    if (!strcasecmp(href, "error") || !strcasecmp(href, "nocontent")) {
        return;                 /* don't print such lines, these aren't
                                   really href's */
    }

    ehref = ap_escape_uri(r->pool, href);
    etext = ap_escape_html(r->pool, text);

    if (!strcasecmp(menu, "formatted")) {
        ap_rvputs(r, "<pre>(Default) <a href=\"", ehref, "\">", etext,
                     "</a></pre>\n", NULL);
    }
    else if (!strcasecmp(menu, "semiformatted")) {
        ap_rvputs(r, "<pre>(Default) <a href=\"", ehref, "\">", etext,
               "</a></pre>\n", NULL);
    }
    else if (!strcasecmp(menu, "unformatted")) {
        ap_rvputs(r, "<a href=\"", ehref, "\">", etext, "</a>", NULL);
    }
}

static void menu_directive(request_rec *r, const char *menu, const char *href, const char *text)
{
    char *ehref, *etext;
    if (!strcasecmp(href, "error") || !strcasecmp(href, "nocontent")) {
        return;                 /* don't print such lines, as this isn't
                                   really an href */
    }

    ehref = ap_escape_uri(r->pool, href);
    etext = ap_escape_html(r->pool, text);

    if (!strcasecmp(menu, "formatted")) {
        ap_rvputs(r, "<pre>          <a href=\"", ehref, "\">", etext,
               "</a></pre>\n", NULL);
    }
    else if (!strcasecmp(menu, "semiformatted")) {
        ap_rvputs(r, "<pre>          <a href=\"", ehref, "\">", etext,
               "</a></pre>\n", NULL);
    }
    else if (!strcasecmp(menu, "unformatted")) {
        ap_rvputs(r, "<a href=\"", ehref, "\">", etext, "</a>", NULL);
    }
}

static void menu_footer(request_rec *r)
{
    ap_rputs("\n\n</body>\n</html>\n", r);         /* finish the menu */
}

static int imap_handler_internal(request_rec *r)
{
    char input[MAX_STRING_LEN];
    char *directive;
    char *value;
    char *href_text;
    const char *base;
    const char *redirect;
    const char *mapdflt;
    char *closest = NULL;
    double closest_yet = -1;
    apr_status_t status;

    double testpoint[2];
    double pointarray[MAXVERTS + 1][2];
    int vertex;

    char *string_pos;
    int showmenu = 0;

    imap_conf_rec *icr;

    char *imap_menu;
    char *imap_default;
    char *imap_base;

    ap_configfile_t *imap;

    icr = ap_get_module_config(r->per_dir_config, &imagemap_module);

    imap_menu = icr->imap_menu ? icr->imap_menu : IMAP_MENU_DEFAULT;
    imap_default = icr->imap_default
      ?  icr->imap_default : IMAP_DEFAULT_DEFAULT;
    imap_base = icr->imap_base ? icr->imap_base : IMAP_BASE_DEFAULT;

    status = ap_pcfg_openfile(&imap, r->pool, r->filename);

    if (status != APR_SUCCESS) {
        return HTTP_NOT_FOUND;
    }

    base = imap_url(r, NULL, imap_base);         /* set base according
                                                    to default */
    if (!base) {
        return HTTP_INTERNAL_SERVER_ERROR;
    }
    mapdflt = imap_url(r, NULL, imap_default);   /* and default to
                                                    global default */
    if (!mapdflt) {
        return HTTP_INTERNAL_SERVER_ERROR;
    }

    testpoint[X] = get_x_coord(r->args);
    testpoint[Y] = get_y_coord(r->args);

    if ((testpoint[X] == -1 || testpoint[Y] == -1) ||
        (testpoint[X] == 0 && testpoint[Y] == 0)) {
        /* if either is -1 or if both are zero (new Lynx) */
        /* we don't have valid coordinates */
        testpoint[X] = -1;
        testpoint[Y] = -1;
        if (strncasecmp(imap_menu, "none", 2)) {
            showmenu = 1;       /* show the menu _unless_ ImapMenu is
                                   'none' or 'no' */
        }
    }

    if (showmenu) {             /* send start of imagemap menu if
                                   we're going to */
        menu_header(r, imap_menu);
    }

    while (!ap_cfg_getline(input, sizeof(input), imap)) {
        if (!input[0]) {
            if (showmenu) {
                menu_blank(r, imap_menu);
            }
            continue;
        }

        if (input[0] == '#') {
            if (showmenu) {
                menu_comment(r, imap_menu, input + 1);
            }
            continue;
        }                       /* blank lines and comments are ignored
                                   if we aren't printing a menu */

        /* find the first two space delimited fields, recall that
         * ap_cfg_getline has removed leading/trailing whitespace.
         *
         * note that we're tokenizing as we go... if we were to use the
         * ap_getword() class of functions we would end up allocating extra
         * memory for every line of the map file
         */
        string_pos = input;
        if (!*string_pos) {   /* need at least two fields */
            goto need_2_fields;
        }

        directive = string_pos;
        while (*string_pos && !apr_isspace(*string_pos)) {   /* past directive */
            ++string_pos;
        }
        if (!*string_pos) {   /* need at least two fields */
            goto need_2_fields;
        }
        *string_pos++ = '\0';

        if (!*string_pos) {   /* need at least two fields */
            goto need_2_fields;
        }
        while (apr_isspace(*string_pos)) { /* past whitespace */
            ++string_pos;
        }

        value = string_pos;
        while (*string_pos && !apr_isspace(*string_pos)) {   /* past value */
            ++string_pos;
        }
        if (apr_isspace(*string_pos)) {
            *string_pos++ = '\0';
        }
        else {
            /* end of input, don't advance past it */
            *string_pos = '\0';
        }

        if (!strncasecmp(directive, "base", 4)) {       /* base, base_uri */
            base = imap_url(r, NULL, value);
            if (!base) {
                goto menu_bail;
            }
            continue;           /* base is never printed to a menu */
        }

        read_quoted(&string_pos, &href_text);

        if (!strcasecmp(directive, "default")) {        /* default */
            mapdflt = imap_url(r, NULL, value);
            if (!mapdflt) {
                goto menu_bail;
            }
            if (showmenu) {     /* print the default if there's a menu */
                redirect = imap_url(r, base, mapdflt);
                if (!redirect) {
                    goto menu_bail;
                }
                menu_default(r, imap_menu, redirect,
                             href_text ? href_text : mapdflt);
            }
            continue;
        }

        vertex = 0;
        while (vertex < MAXVERTS &&
               sscanf(string_pos, "%lf%*[, ]%lf",
                      &pointarray[vertex][X], &pointarray[vertex][Y]) == 2) {
            /* Now skip what we just read... we can't use ANSIism %n */
            while (apr_isspace(*string_pos)) {      /* past whitespace */
                string_pos++;
            }
            while (apr_isdigit(*string_pos)) {      /* and the 1st number */
                string_pos++;
            }
            string_pos++;       /* skip the ',' */
            while (apr_isspace(*string_pos)) {      /* past any more whitespace */
                string_pos++;
            }
            while (apr_isdigit(*string_pos)) {      /* 2nd number */
                string_pos++;
            }
            vertex++;
        }                       /* so long as there are more vertices to
                                   read, and we have room, read them in.
                                   We start where we left off of the last
                                   sscanf, not at the beginning. */

        pointarray[vertex][X] = -1;     /* signals the end of vertices */

        if (showmenu) {
            if (!href_text) {
                read_quoted(&string_pos, &href_text);     /* href text could
                                                             be here instead */
            }
            redirect = imap_url(r, base, value);
            if (!redirect) {
                goto menu_bail;
            }
            menu_directive(r, imap_menu, redirect,
                           href_text ? href_text : value);
            continue;
        }
        /* note that we don't make it past here if we are making a menu */

        if (testpoint[X] == -1 || pointarray[0][X] == -1) {
            continue;           /* don't try the following tests if testpoints
                                   are invalid, or if there are no
                                   coordinates */
        }

        if (!strcasecmp(directive, "poly")) {   /* poly */

            if (pointinpoly(testpoint, pointarray)) {
                ap_cfg_closefile(imap);
                redirect = imap_url(r, base, value);
                if (!redirect) {
                    return HTTP_INTERNAL_SERVER_ERROR;
                }
                return (imap_reply(r, redirect));
            }
            continue;
        }

        if (!strcasecmp(directive, "circle")) {         /* circle */

            if (pointincircle(testpoint, pointarray)) {
                ap_cfg_closefile(imap);
                redirect = imap_url(r, base, value);
                if (!redirect) {
                    return HTTP_INTERNAL_SERVER_ERROR;
                }
                return (imap_reply(r, redirect));
            }
            continue;
        }

        if (!strcasecmp(directive, "rect")) {   /* rect */

            if (pointinrect(testpoint, pointarray)) {
                ap_cfg_closefile(imap);
                redirect = imap_url(r, base, value);
                if (!redirect) {
                    return HTTP_INTERNAL_SERVER_ERROR;
                }
                return (imap_reply(r, redirect));
            }
            continue;
        }

        if (!strcasecmp(directive, "point")) {  /* point */

            if (is_closer(testpoint, pointarray, &closest_yet)) {
                closest = apr_pstrdup(r->pool, value);
            }

            continue;
        }                       /* move on to next line whether it's
                                   closest or not */

    }                           /* nothing matched, so we get another line! */

    ap_cfg_closefile(imap);        /* we are done with the map file; close it */

    if (showmenu) {
        menu_footer(r);         /* finish the menu and we are done */
        return OK;
    }

    if (closest) {             /* if a 'point' directive has been seen */
        redirect = imap_url(r, base, closest);
        if (!redirect) {
            return HTTP_INTERNAL_SERVER_ERROR;
        }
        return (imap_reply(r, redirect));
    }

    if (mapdflt) {             /* a default should be defined, even if
                                  only 'nocontent' */
        redirect = imap_url(r, base, mapdflt);
        if (!redirect) {
            return HTTP_INTERNAL_SERVER_ERROR;
        }
        return (imap_reply(r, redirect));
    }

    return HTTP_INTERNAL_SERVER_ERROR;        /* If we make it this far,
                                                 we failed. They lose! */

need_2_fields:
    ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(00679)
                "map file %s, line %d syntax error: requires at "
                "least two fields", r->uri, imap->line_number);
    /* fall through */
menu_bail:
    ap_cfg_closefile(imap);
    if (showmenu) {
        /* There's not much else we can do ... we've already sent the headers
         * to the client.
         */
        ap_rputs("\n\n[an internal server error occured]\n", r);
        menu_footer(r);
        return OK;
    }
    return HTTP_INTERNAL_SERVER_ERROR;
}

static int imap_handler(request_rec *r)
{
    /* Optimization: skip the allocation of large local variables on the
     * stack (in imap_handler_internal()) on requests that aren't using
     * imagemaps
     */
    if (r->method_number != M_GET || (strcmp(r->handler,IMAP_MAGIC_TYPE)
                                      && strcmp(r->handler, "imap-file"))) {
        return DECLINED;
    }
    else {
        return imap_handler_internal(r);
    }
}

static void register_hooks(apr_pool_t *p)
{
    ap_hook_handler(imap_handler,NULL,NULL,APR_HOOK_MIDDLE);
}

AP_DECLARE_MODULE(imagemap) =
{
    STANDARD20_MODULE_STUFF,
    create_imap_dir_config,     /* dir config creater */
    merge_imap_dir_configs,     /* dir merger --- default is to override */
    NULL,                       /* server config */
    NULL,                       /* merge server config */
    imap_cmds,                  /* command apr_table_t */
    register_hooks              /* register hooks */
};