1 /* Conversion of links to local files.
2 Copyright (C) 2003, 2004, 2005, 2006, 2007,
3 2008 Free Software Foundation, Inc.
5 This file is part of GNU Wget.
7 GNU Wget is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
12 GNU Wget is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with Wget. If not, see <http://www.gnu.org/licenses/>.
20 Additional permission under GNU GPL version 3 section 7
22 If you modify this program, or any covered work, by linking or
23 combining it with the OpenSSL project's OpenSSL library (or a
24 modified version of that library), containing parts covered by the
25 terms of the OpenSSL or SSLeay licenses, the Free Software Foundation
26 grants you additional permission to convey the resulting work.
27 Corresponding Source for a non-source form of such a combination
28 shall include the source code for the parts of OpenSSL used as well
29 as that of the covered work. */
38 #endif /* HAVE_UNISTD_H */
49 static struct hash_table *dl_file_url_map;
50 struct hash_table *dl_url_file_map;
52 /* Set of HTML files downloaded in this Wget run, used for link
53 conversion after Wget is done. */
54 struct hash_table *downloaded_html_set;
56 static void convert_links (const char *, struct urlpos *);
58 /* This function is called when the retrieval is done to convert the
59 links that have been downloaded. It has to be called at the end of
60 the retrieval, because only then does Wget know conclusively which
61 URLs have been downloaded, and which not, so it can tell which
62 direction to convert to.
64 The "direction" means that the URLs to the files that have been
65 downloaded get converted to the relative URL which will point to
66 that file. And the other URLs get converted to the remote URL on
69 All the downloaded HTMLs are kept in downloaded_html_files, and
70 downloaded URLs in urls_downloaded. All the information is
71 extracted from these two lists. */
74 convert_all_links (void)
80 struct ptimer *timer = ptimer_new ();
86 if (downloaded_html_set)
87 cnt = hash_table_count (downloaded_html_set);
90 file_array = alloca_array (char *, cnt);
91 string_set_to_array (downloaded_html_set, file_array);
93 for (i = 0; i < cnt; i++)
95 struct urlpos *urls, *cur_url;
97 char *file = file_array[i];
99 /* Determine the URL of the HTML file. get_urls_html will need
101 url = hash_table_get (dl_file_url_map, file);
104 DEBUGP (("Apparently %s has been removed.\n", file));
108 DEBUGP (("Scanning %s (from %s)\n", file, url));
110 /* Parse the HTML file... */
111 urls = get_urls_html (file, url, NULL);
113 /* We don't respect meta_disallow_follow here because, even if
114 the file is not followed, we might still want to convert the
115 links that have been followed from other files. */
117 for (cur_url = urls; cur_url; cur_url = cur_url->next)
120 struct url *u = cur_url->url;
122 if (cur_url->link_base_p)
124 /* Base references have been resolved by our parser, so
125 we turn the base URL into an empty string. (Perhaps
126 we should remove the tag entirely?) */
127 cur_url->convert = CO_NULLIFY_BASE;
131 /* We decide the direction of conversion according to whether
132 a URL was downloaded. Downloaded URLs will be converted
133 ABS2REL, whereas non-downloaded will be converted REL2ABS. */
134 local_name = hash_table_get (dl_url_file_map, u->url);
136 /* Decide on the conversion type. */
139 /* We've downloaded this URL. Convert it to relative
140 form. We do this even if the URL already is in
141 relative form, because our directory structure may
142 not be identical to that on the server (think `-nd',
143 `--cut-dirs', etc.) */
144 cur_url->convert = CO_CONVERT_TO_RELATIVE;
145 cur_url->local_name = xstrdup (local_name);
146 DEBUGP (("will convert url %s to local %s\n", u->url, local_name));
150 /* We haven't downloaded this URL. If it's not already
151 complete (including a full host name), convert it to
152 that form, so it can be reached while browsing this
154 if (!cur_url->link_complete_p)
155 cur_url->convert = CO_CONVERT_TO_COMPLETE;
156 cur_url->local_name = NULL;
157 DEBUGP (("will convert url %s to complete\n", u->url));
161 /* Convert the links in the file. */
162 convert_links (file, urls);
169 secs = ptimer_measure (timer);
170 logprintf (LOG_VERBOSE, _("Converted %d files in %s seconds.\n"),
171 file_count, print_decimal (secs));
173 ptimer_destroy (timer);
176 static void write_backup_file (const char *, downloaded_file_t);
177 static const char *replace_attr (const char *, int, FILE *, const char *);
178 static const char *replace_attr_refresh_hack (const char *, int, FILE *,
180 static char *local_quote_string (const char *);
181 static char *construct_relative (const char *, const char *);
183 /* Change the links in one HTML file. LINKS is a list of links in the
184 document, along with their positions and the desired direction of
187 convert_links (const char *file, struct urlpos *links)
189 struct file_memory *fm;
192 downloaded_file_t downloaded_file_return;
195 int to_url_count = 0, to_file_count = 0;
197 logprintf (LOG_VERBOSE, _("Converting %s... "), file);
200 /* First we do a "dry run": go through the list L and see whether
201 any URL needs to be converted in the first place. If not, just
202 leave the file alone. */
205 for (dry = links; dry; dry = dry->next)
206 if (dry->convert != CO_NOCONVERT)
210 logputs (LOG_VERBOSE, _("nothing to do.\n"));
215 fm = read_file (file);
218 logprintf (LOG_NOTQUIET, _("Cannot convert links in %s: %s\n"),
219 file, strerror (errno));
223 downloaded_file_return = downloaded_file (CHECK_FOR_FILE, file);
224 if (opt.backup_converted && downloaded_file_return)
225 write_backup_file (file, downloaded_file_return);
227 /* Before opening the file for writing, unlink the file. This is
228 important if the data in FM is mmaped. In such case, nulling the
229 file, which is what fopen() below does, would make us read all
230 zeroes from the mmaped region. */
231 if (unlink (file) < 0 && errno != ENOENT)
233 logprintf (LOG_NOTQUIET, _("Unable to delete `%s': %s\n"),
234 file, strerror (errno));
238 /* Now open the file for writing. */
239 fp = fopen (file, "wb");
242 logprintf (LOG_NOTQUIET, _("Cannot convert links in %s: %s\n"),
243 file, strerror (errno));
248 /* Here we loop through all the URLs in file, replacing those of
249 them that are downloaded with relative references. */
251 for (link = links; link; link = link->next)
253 char *url_start = fm->content + link->pos;
255 if (link->pos >= fm->length)
257 DEBUGP (("Something strange is going on. Please investigate."));
260 /* If the URL is not to be converted, skip it. */
261 if (link->convert == CO_NOCONVERT)
263 DEBUGP (("Skipping %s at position %d.\n", link->url->url, link->pos));
267 /* Echo the file contents, up to the offending URL's opening
268 quote, to the outfile. */
269 fwrite (p, 1, url_start - p, fp);
272 switch (link->convert)
274 case CO_CONVERT_TO_RELATIVE:
275 /* Convert absolute URL to relative. */
277 char *newname = construct_relative (file, link->local_name);
278 char *quoted_newname = local_quote_string (newname);
280 if (!link->link_refresh_p)
281 p = replace_attr (p, link->size, fp, quoted_newname);
283 p = replace_attr_refresh_hack (p, link->size, fp, quoted_newname,
284 link->refresh_timeout);
286 DEBUGP (("TO_RELATIVE: %s to %s at position %d in %s.\n",
287 link->url->url, newname, link->pos, file));
289 xfree (quoted_newname);
293 case CO_CONVERT_TO_COMPLETE:
294 /* Convert the link to absolute URL. */
296 char *newlink = link->url->url;
297 char *quoted_newlink = html_quote_string (newlink);
299 if (!link->link_refresh_p)
300 p = replace_attr (p, link->size, fp, quoted_newlink);
302 p = replace_attr_refresh_hack (p, link->size, fp, quoted_newlink,
303 link->refresh_timeout);
305 DEBUGP (("TO_COMPLETE: <something> to %s at position %d in %s.\n",
306 newlink, link->pos, file));
307 xfree (quoted_newlink);
311 case CO_NULLIFY_BASE:
312 /* Change the base href to "". */
313 p = replace_attr (p, link->size, fp, "");
321 /* Output the rest of the file. */
322 if (p - fm->content < fm->length)
323 fwrite (p, 1, fm->length - (p - fm->content), fp);
327 logprintf (LOG_VERBOSE, "%d-%d\n", to_file_count, to_url_count);
330 /* Construct and return a link that points from BASEFILE to LINKFILE.
331 Both files should be local file names, BASEFILE of the referrering
332 file, and LINKFILE of the referred file.
336 cr("foo", "bar") -> "bar"
337 cr("A/foo", "A/bar") -> "bar"
338 cr("A/foo", "A/B/bar") -> "B/bar"
339 cr("A/X/foo", "A/Y/bar") -> "../Y/bar"
340 cr("X/", "Y/bar") -> "../Y/bar" (trailing slash does matter in BASE)
342 Both files should be absolute or relative, otherwise strange
343 results might ensue. The function makes no special efforts to
344 handle "." and ".." in links, so make sure they're not there
345 (e.g. using path_simplify). */
348 construct_relative (const char *basefile, const char *linkfile)
355 /* First, skip the initial directory components common to both
358 for (b = basefile, l = linkfile; *b == *l && *b != '\0'; ++b, ++l)
361 start = (b - basefile) + 1;
366 /* With common directories out of the way, the situation we have is
368 b - b1/b2/[...]/bfile
369 l - l1/l2/[...]/lfile
371 The link we're constructing needs to be:
372 lnk - ../../l1/l2/[...]/lfile
374 Where the number of ".."'s equals the number of bN directory
377 /* Count the directory components in B. */
379 for (b = basefile; *b; b++)
385 /* Construct LINK as explained above. */
386 link = xmalloc (3 * basedirs + strlen (linkfile) + 1);
387 for (i = 0; i < basedirs; i++)
388 memcpy (link + 3 * i, "../", 3);
389 strcpy (link + 3 * i, linkfile);
393 /* Used by write_backup_file to remember which files have been
395 static struct hash_table *converted_files;
398 write_backup_file (const char *file, downloaded_file_t downloaded_file_return)
400 /* Rather than just writing over the original .html file with the
401 converted version, save the former to *.orig. Note we only do
402 this for files we've _successfully_ downloaded, so we don't
403 clobber .orig files sitting around from previous invocations.
404 On VMS, use "_orig" instead of ".orig". See "wget.h". */
406 /* Construct the backup filename as the original name plus ".orig". */
407 size_t filename_len = strlen (file);
408 char* filename_plus_orig_suffix;
410 if (downloaded_file_return == FILE_DOWNLOADED_AND_HTML_EXTENSION_ADDED)
412 /* Just write "orig" over "html". We need to do it this way
413 because when we're checking to see if we've downloaded the
414 file before (to see if we can skip downloading it), we don't
415 know if it's a text/html file. Therefore we don't know yet
416 at that stage that -E is going to cause us to tack on
417 ".html", so we need to compare vs. the original URL plus
418 ".orig", not the original URL plus ".html.orig". */
419 filename_plus_orig_suffix = alloca (filename_len + 1);
420 strcpy (filename_plus_orig_suffix, file);
421 strcpy ((filename_plus_orig_suffix + filename_len) - 4, "orig");
423 else /* downloaded_file_return == FILE_DOWNLOADED_NORMALLY */
425 /* Append ".orig" to the name. */
426 filename_plus_orig_suffix = alloca (filename_len + sizeof ("ORIG_SFX"));
427 strcpy (filename_plus_orig_suffix, file);
428 strcpy (filename_plus_orig_suffix + filename_len, "ORIG_SFX");
431 if (!converted_files)
432 converted_files = make_string_hash_table (0);
434 /* We can get called twice on the same URL thanks to the
435 convert_all_links() call in main(). If we write the .orig file
436 each time in such a case, it'll end up containing the first-pass
437 conversion, not the original file. So, see if we've already been
438 called on this file. */
439 if (!string_set_contains (converted_files, file))
441 /* Rename <file> to <file>.orig before former gets written over. */
442 if (rename (file, filename_plus_orig_suffix) != 0)
443 logprintf (LOG_NOTQUIET, _("Cannot back up %s as %s: %s\n"),
444 file, filename_plus_orig_suffix, strerror (errno));
446 /* Remember that we've already written a .orig backup for this file.
447 Note that we never free this memory since we need it till the
448 convert_all_links() call, which is one of the last things the
449 program does before terminating. BTW, I'm not sure if it would be
450 safe to just set 'converted_file_ptr->string' to 'file' below,
451 rather than making a copy of the string... Another note is that I
452 thought I could just add a field to the urlpos structure saying
453 that we'd written a .orig file for this URL, but that didn't work,
454 so I had to make this separate list.
455 -- Dan Harkless <wget@harkless.org>
457 This [adding a field to the urlpos structure] didn't work
458 because convert_file() is called from convert_all_links at
459 the end of the retrieval with a freshly built new urlpos
461 -- Hrvoje Niksic <hniksic@xemacs.org>
463 string_set_add (converted_files, file);
467 static bool find_fragment (const char *, int, const char **, const char **);
469 /* Replace an attribute's original text with NEW_TEXT. */
472 replace_attr (const char *p, int size, FILE *fp, const char *new_text)
474 bool quote_flag = false;
475 char quote_char = '\"'; /* use "..." for quoting, unless the
476 original value is quoted, in which
477 case reuse its quoting char. */
478 const char *frag_beg, *frag_end;
480 /* Structure of our string is:
482 <--- size ---> (with quotes)
485 <--- size --> (no quotes) */
487 if (*p == '\"' || *p == '\'')
492 size -= 2; /* disregard opening and closing quote */
494 putc (quote_char, fp);
495 fputs (new_text, fp);
497 /* Look for fragment identifier, if any. */
498 if (find_fragment (p, size, &frag_beg, &frag_end))
499 fwrite (frag_beg, 1, frag_end - frag_beg, fp);
503 putc (quote_char, fp);
508 /* The same as REPLACE_ATTR, but used when replacing
509 <meta http-equiv=refresh content="new_text"> because we need to
510 append "timeout_value; URL=" before the next_text. */
513 replace_attr_refresh_hack (const char *p, int size, FILE *fp,
514 const char *new_text, int timeout)
517 char *new_with_timeout = (char *)alloca (numdigit (timeout)
521 sprintf (new_with_timeout, "%d; URL=%s", timeout, new_text);
523 return replace_attr (p, size, fp, new_with_timeout);
526 /* Find the first occurrence of '#' in [BEG, BEG+SIZE) that is not
527 preceded by '&'. If the character is not found, return zero. If
528 the character is found, return true and set BP and EP to point to
529 the beginning and end of the region.
531 This is used for finding the fragment indentifiers in URLs. */
534 find_fragment (const char *beg, int size, const char **bp, const char **ep)
536 const char *end = beg + size;
537 bool saw_amp = false;
538 for (; beg < end; beg++)
560 /* Quote FILE for use as local reference to an HTML file.
562 We quote ? as %3F to avoid passing part of the file name as the
563 parameter when browsing the converted file through HTTP. However,
564 it is safe to do this only when `--html-extension' is turned on.
565 This is because converting "index.html?foo=bar" to
566 "index.html%3Ffoo=bar" would break local browsing, as the latter
567 isn't even recognized as an HTML file! However, converting
568 "index.html?foo=bar.html" to "index.html%3Ffoo=bar.html" should be
569 safe for both local and HTTP-served browsing.
571 We always quote "#" as "%23" and "%" as "%25" because those
572 characters have special meanings in URLs. */
575 local_quote_string (const char *file)
580 char *any = strpbrk (file, "?#%");
582 return html_quote_string (file);
584 /* Allocate space assuming the worst-case scenario, each character
585 having to be quoted. */
586 to = newname = (char *)alloca (3 * strlen (file) + 1);
587 for (from = file; *from; from++)
601 if (opt.html_extension)
614 return html_quote_string (newname);
617 /* Book-keeping code for dl_file_url_map, dl_url_file_map,
618 downloaded_html_list, and downloaded_html_set. Other code calls
619 these functions to let us know that a file has been downloaded. */
621 #define ENSURE_TABLES_EXIST do { \
622 if (!dl_file_url_map) \
623 dl_file_url_map = make_string_hash_table (0); \
624 if (!dl_url_file_map) \
625 dl_url_file_map = make_string_hash_table (0); \
628 /* Return true if S1 and S2 are the same, except for "/index.html".
629 The three cases in which it returns one are (substitute any
630 substring for "foo"):
632 m("foo/index.html", "foo/") ==> 1
633 m("foo/", "foo/index.html") ==> 1
634 m("foo", "foo/index.html") ==> 1
635 m("foo", "foo/" ==> 1
636 m("foo", "foo") ==> 1 */
639 match_except_index (const char *s1, const char *s2)
644 /* Skip common substring. */
645 for (i = 0; *s1 && *s2 && *s1 == *s2; s1++, s2++, i++)
648 /* Strings differ at the very beginning -- bail out. We need to
649 check this explicitly to avoid `lng - 1' reading outside the
654 /* Both strings hit EOF -- strings are equal. */
657 /* Strings are randomly different, e.g. "/foo/bar" and "/foo/qux". */
660 /* S1 is the longer one. */
663 /* S2 is the longer one. */
667 /* foo/index.html */ /* or */ /* foo/index.html */
671 /* The right-hand case. */
674 if (*lng == '/' && *(lng + 1) == '\0')
679 return 0 == strcmp (lng, "/index.html");
683 dissociate_urls_from_file_mapper (void *key, void *value, void *arg)
685 char *mapping_url = (char *)key;
686 char *mapping_file = (char *)value;
687 char *file = (char *)arg;
689 if (0 == strcmp (mapping_file, file))
691 hash_table_remove (dl_url_file_map, mapping_url);
693 xfree (mapping_file);
696 /* Continue mapping. */
700 /* Remove all associations from various URLs to FILE from dl_url_file_map. */
703 dissociate_urls_from_file (const char *file)
705 /* Can't use hash_table_iter_* because the table mutates while mapping. */
706 hash_table_for_each (dl_url_file_map, dissociate_urls_from_file_mapper,
710 /* Register that URL has been successfully downloaded to FILE. This
711 is used by the link conversion code to convert references to URLs
712 to references to local files. It is also being used to check if a
713 URL has already been downloaded. */
716 register_download (const char *url, const char *file)
718 char *old_file, *old_url;
722 /* With some forms of retrieval, it is possible, although not likely
723 or particularly desirable. If both are downloaded, the second
724 download will override the first one. When that happens,
725 dissociate the old file name from the URL. */
727 if (hash_table_get_pair (dl_file_url_map, file, &old_file, &old_url))
729 if (0 == strcmp (url, old_url))
730 /* We have somehow managed to download the same URL twice.
734 if (match_except_index (url, old_url)
735 && !hash_table_contains (dl_url_file_map, url))
736 /* The two URLs differ only in the "index.html" ending. For
737 example, one is "http://www.server.com/", and the other is
738 "http://www.server.com/index.html". Don't remove the old
739 one, just add the new one as a non-canonical entry. */
742 hash_table_remove (dl_file_url_map, file);
746 /* Remove all the URLs that point to this file. Yes, there can
747 be more than one such URL, because we store redirections as
748 multiple entries in dl_url_file_map. For example, if URL1
749 redirects to URL2 which gets downloaded to FILE, we map both
750 URL1 and URL2 to FILE in dl_url_file_map. (dl_file_url_map
751 only points to URL2.) When another URL gets loaded to FILE,
752 we want both URL1 and URL2 dissociated from it.
754 This is a relatively expensive operation because it performs
755 a linear search of the whole hash table, but it should be
756 called very rarely, only when two URLs resolve to the same
757 file name, *and* the "<file>.1" extensions are turned off.
758 In other words, almost never. */
759 dissociate_urls_from_file (file);
762 hash_table_put (dl_file_url_map, xstrdup (file), xstrdup (url));
765 /* A URL->FILE mapping is not possible without a FILE->URL mapping.
766 If the latter were present, it should have been removed by the
767 above `if'. So we could write:
769 assert (!hash_table_contains (dl_url_file_map, url));
771 The above is correct when running in recursive mode where the
772 same URL always resolves to the same file. But if you do
777 then the first URL will resolve to "FILE", and the other to
778 "FILE.1". In that case, FILE.1 will not be found in
779 dl_file_url_map, but URL will still point to FILE in
781 if (hash_table_get_pair (dl_url_file_map, url, &old_url, &old_file))
783 hash_table_remove (dl_url_file_map, url);
788 hash_table_put (dl_url_file_map, xstrdup (url), xstrdup (file));
791 /* Register that FROM has been redirected to TO. This assumes that TO
792 is successfully downloaded and already registered using
793 register_download() above. */
796 register_redirection (const char *from, const char *to)
802 file = hash_table_get (dl_url_file_map, to);
803 assert (file != NULL);
804 if (!hash_table_contains (dl_url_file_map, from))
805 hash_table_put (dl_url_file_map, xstrdup (from), xstrdup (file));
808 /* Register that the file has been deleted. */
811 register_delete_file (const char *file)
813 char *old_url, *old_file;
817 if (!hash_table_get_pair (dl_file_url_map, file, &old_file, &old_url))
820 hash_table_remove (dl_file_url_map, file);
823 dissociate_urls_from_file (file);
826 /* Register that FILE is an HTML file that has been downloaded. */
829 register_html (const char *url, const char *file)
831 if (!downloaded_html_set)
832 downloaded_html_set = make_string_hash_table (0);
833 string_set_add (downloaded_html_set, file);
836 static void downloaded_files_free (void);
838 /* Cleanup the data structures associated with this file. */
841 convert_cleanup (void)
845 free_keys_and_values (dl_file_url_map);
846 hash_table_destroy (dl_file_url_map);
847 dl_file_url_map = NULL;
851 free_keys_and_values (dl_url_file_map);
852 hash_table_destroy (dl_url_file_map);
853 dl_url_file_map = NULL;
855 if (downloaded_html_set)
856 string_set_free (downloaded_html_set);
857 downloaded_files_free ();
859 string_set_free (converted_files);
862 /* Book-keeping code for downloaded files that enables extension
865 /* This table should really be merged with dl_file_url_map and
866 downloaded_html_files. This was originally a list, but I changed
867 it to a hash table beause it was actually taking a lot of time to
868 find things in it. */
870 static struct hash_table *downloaded_files_hash;
872 /* We're storing "modes" of type downloaded_file_t in the hash table.
873 However, our hash tables only accept pointers for keys and values.
874 So when we need a pointer, we use the address of a
875 downloaded_file_t variable of static storage. */
877 static downloaded_file_t *
878 downloaded_mode_to_ptr (downloaded_file_t mode)
880 static downloaded_file_t
881 v1 = FILE_NOT_ALREADY_DOWNLOADED,
882 v2 = FILE_DOWNLOADED_NORMALLY,
883 v3 = FILE_DOWNLOADED_AND_HTML_EXTENSION_ADDED,
888 case FILE_NOT_ALREADY_DOWNLOADED:
890 case FILE_DOWNLOADED_NORMALLY:
892 case FILE_DOWNLOADED_AND_HTML_EXTENSION_ADDED:
900 /* Remembers which files have been downloaded. In the standard case,
901 should be called with mode == FILE_DOWNLOADED_NORMALLY for each
902 file we actually download successfully (i.e. not for ones we have
903 failures on or that we skip due to -N).
905 When we've downloaded a file and tacked on a ".html" extension due
906 to -E, call this function with
907 FILE_DOWNLOADED_AND_HTML_EXTENSION_ADDED rather than
908 FILE_DOWNLOADED_NORMALLY.
910 If you just want to check if a file has been previously added
911 without adding it, call with mode == CHECK_FOR_FILE. Please be
912 sure to call this function with local filenames, not remote
916 downloaded_file (downloaded_file_t mode, const char *file)
918 downloaded_file_t *ptr;
920 if (mode == CHECK_FOR_FILE)
922 if (!downloaded_files_hash)
923 return FILE_NOT_ALREADY_DOWNLOADED;
924 ptr = hash_table_get (downloaded_files_hash, file);
926 return FILE_NOT_ALREADY_DOWNLOADED;
930 if (!downloaded_files_hash)
931 downloaded_files_hash = make_string_hash_table (0);
933 ptr = hash_table_get (downloaded_files_hash, file);
937 ptr = downloaded_mode_to_ptr (mode);
938 hash_table_put (downloaded_files_hash, xstrdup (file), ptr);
940 return FILE_NOT_ALREADY_DOWNLOADED;
944 downloaded_files_free (void)
946 if (downloaded_files_hash)
948 hash_table_iterator iter;
949 for (hash_table_iterate (downloaded_files_hash, &iter);
950 hash_table_iter_next (&iter);
953 hash_table_destroy (downloaded_files_hash);
954 downloaded_files_hash = NULL;
958 /* The function returns the pointer to the malloc-ed quoted version of
959 string s. It will recognize and quote numeric and special graphic
960 entities, as per RFC1866:
968 No other entities are recognized or replaced. */
970 html_quote_string (const char *s)
976 /* Pass through the string, and count the new size. */
977 for (i = 0; *s; s++, i++)
981 else if (*s == '<' || *s == '>')
982 i += 3; /* `lt;' and `gt;' */
984 i += 5; /* `quot;' */
988 res = xmalloc (i + 1);
990 for (p = res; *s; s++)
1003 *p++ = (*s == '<' ? 'l' : 'g');