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https://github.com/moparisthebest/wget
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[svn] Committed my patch from <sxs7l6ozghz.fsf@florida.arsdigita.de>.
This commit is contained in:
hniksic
parent
0dd418242a
commit
f6715dd08d
@ -1,3 +1,9 @@
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2000-11-01 Hrvoje Niksic <hniksic@arsdigita.com>
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* url.c (construct): Rewritten for clarity. Avoids the
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unnecessary copying and stack-allocation the old version
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performed.
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2000-10-31 Hrvoje Niksic <hniksic@arsdigita.com>
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* ftp.c (getftp): Ditto.
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181
src/url.c
181
src/url.c
@ -622,10 +622,10 @@ process_ftp_type (char *path)
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return '\0';
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}
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/* Return the URL as fine-formed string, with a proper protocol, port
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number, directory and optional user/password. If HIDE is non-zero,
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password will be hidden. The forbidden characters in the URL will
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be cleansed. */
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/* Return the URL as fine-formed string, with a proper protocol,
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optional port number, directory and optional user/password. If
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HIDE is non-zero, password will be hidden. The forbidden
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characters in the URL will be cleansed. */
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char *
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str_url (const struct urlinfo *u, int hide)
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{
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@ -659,7 +659,7 @@ str_url (const struct urlinfo *u, int hide)
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{
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char *tmp = (char *)xmalloc (strlen (dir) + 3);
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/*sprintf (tmp, "%%2F%s", dir + 1);*/
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*tmp = '%';
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tmp[0] = '%';
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tmp[1] = '2';
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tmp[2] = 'F';
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strcpy (tmp + 3, dir + 1);
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@ -1266,25 +1266,28 @@ url_filename (const struct urlinfo *u)
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return name;
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}
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/* Like strlen(), except if `?' is present in the URL and its protocol
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is HTTP, act as if `?' is the end of the string. Needed for the
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correct implementation of `construct' below, at least until we code
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up proper parsing of URLs. */
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/* Like strlen(), but allow the URL to be ended with '?'. */
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static int
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urllen_http_hack (const char *url)
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urlpath_length (const char *url)
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{
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if ((!strncmp (url, "http://", 7)
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|| !strncmp (url, "https://", 7)))
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{
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const char *q = strchr (url, '?');
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if (q)
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return q - url;
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}
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const char *q = strchr (url, '?');
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if (q)
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return q - url;
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return strlen (url);
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}
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static const char *
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find_last_char (const char *b, const char *e, char c)
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{
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for (; e > b; e--)
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if (*e == c)
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return e;
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return NULL;
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}
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/* Construct an absolute URL, given a (possibly) relative one. This
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is more tricky than it might seem, but it works. */
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gets tricky if you want to cover all the "reasonable" cases, but
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I'm satisfied with the result. */
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static char *
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construct (const char *url, const char *sub, int subsize, int no_proto)
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{
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@ -1292,62 +1295,116 @@ construct (const char *url, const char *sub, int subsize, int no_proto)
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if (no_proto)
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{
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int i;
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const char *end = url + urlpath_length (url);
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if (*sub != '/')
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{
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for (i = urllen_http_hack (url); i && url[i] != '/'; i--);
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if (!i || (url[i] == url[i - 1]))
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/* SUB is a relative URL: we need to replace everything
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after last slash (possibly empty) with SUB.
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So, if URL is "whatever/foo/bar", and SUB is "qux/xyzzy",
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our result should be "whatever/foo/qux/xyzzy". */
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int need_explicit_slash = 0;
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int span;
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const char *start_insert;
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const char *last_slash = find_last_char (url, end, '/'); /* the last slash. */
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if (!last_slash)
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{
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int l = urllen_http_hack (url);
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char *t = (char *)alloca (l + 2);
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memcpy (t, url, l);
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t[l] = '/';
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t[l + 1] = '\0';
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url = t;
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i = l;
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/* No slash found at all. Append SUB to what we have,
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but we'll need a slash as a separator.
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Example: if url == "foo" and sub == "qux/xyzzy", then
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we cannot just append sub to url, because we'd get
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"fooqux/xyzzy", whereas what we want is
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"foo/qux/xyzzy".
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To make sure the / gets inserted, we set
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need_explicit_slash to 1. We also set start_insert
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to end + 1, so that the length calculations work out
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correctly for one more (slash) character. Accessing
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that character is fine, since it will be the
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delimiter, '\0' or '?'. */
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/* example: "foo?..." */
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/* ^ ('?' gets changed to '/') */
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start_insert = end + 1;
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need_explicit_slash = 1;
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}
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constr = (char *)xmalloc (i + 1 + subsize + 1);
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strncpy (constr, url, i + 1);
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constr[i + 1] = '\0';
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strncat (constr, sub, subsize);
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else
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{
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/* example: "whatever/foo/bar" */
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/* ^ */
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start_insert = last_slash + 1;
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}
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span = start_insert - url;
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constr = (char *)xmalloc (span + subsize + 1);
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if (span)
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memcpy (constr, url, span);
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if (need_explicit_slash)
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constr[span - 1] = '/';
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if (subsize)
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memcpy (constr + span, sub, subsize);
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constr[span + subsize] = '\0';
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}
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else /* *sub == `/' */
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{
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int fl;
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/* SUB is an absolute path: we need to replace everything
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after (and including) the FIRST slash with SUB.
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i = 0;
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do
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{
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for (; url[i] && url[i] != '/'; i++);
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if (!url[i])
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break;
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fl = (url[i] == url[i + 1] && url[i + 1] == '/');
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if (fl)
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i += 2;
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}
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while (fl);
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if (!url[i])
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{
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int l = urllen_http_hack (url);
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char *t = (char *)alloca (l + 2);
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strcpy (t, url);
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t[l] = '/';
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t[l + 1] = '\0';
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url = t;
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}
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constr = (char *)xmalloc (i + 1 + subsize + 1);
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strncpy (constr, url, i);
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constr[i] = '\0';
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strncat (constr + i, sub, subsize);
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constr[i + subsize] = '\0';
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} /* *sub == `/' */
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So, if URL is "http://host/whatever/foo/bar", and SUB is
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"/qux/xyzzy", our result should be
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"http://host/qux/xyzzy". */
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int span;
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const char *slash, *start_insert;
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const char *pos = url;
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int seen_slash_slash = 0;
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/* We're looking for the first slash, but want to ignore
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double slash. */
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again:
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slash = memchr (pos, '/', end - pos);
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if (slash && !seen_slash_slash)
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if (*(slash + 1) == '/')
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{
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pos = slash + 2;
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seen_slash_slash = 1;
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goto again;
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}
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/* At this point, SLASH is the location of the first / after
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"//", or the first slash altogether. START_INSERT is the
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pointer to the location where SUB will be inserted. When
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examining the last two examples, keep in mind that SUB
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begins with '/'. */
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if (!slash && !seen_slash_slash)
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/* example: "foo" */
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/* ^ */
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start_insert = url;
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else if (!slash && seen_slash_slash)
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/* example: "http://foo" */
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/* ^ */
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start_insert = end;
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else if (slash && !seen_slash_slash)
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/* example: "foo/bar" */
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/* ^ */
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start_insert = url;
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else if (slash && seen_slash_slash)
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/* example: "http://something/" */
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/* ^ */
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start_insert = slash;
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span = start_insert - url;
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constr = (char *)xmalloc (span + subsize + 1);
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if (span)
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memcpy (constr, url, span);
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if (subsize)
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memcpy (constr + span, sub, subsize);
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constr[span + subsize] = '\0';
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}
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}
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else /* !no_proto */
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{
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constr = (char *)xmalloc (subsize + 1);
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strncpy (constr, sub, subsize);
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constr[subsize] = '\0';
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constr = strdupdelim (sub, sub + subsize);
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}
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return constr;
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}
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