2 Copyright (C) 1995, 1996, 1997, 2000, 2001, 2003, 2003
3 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 2 of the License, or (at
10 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, write to the Free Software
19 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21 In addition, as a special exception, the Free Software Foundation
22 gives permission to link the code of its release of Wget with the
23 OpenSSL project's "OpenSSL" library (or with modified versions of it
24 that use the same license as the "OpenSSL" library), and distribute
25 the linked executables. You must obey the GNU General Public License
26 in all respects for all of the code used other than "OpenSSL". If you
27 modify this file, you may extend this exception to your version of the
28 file, but you are not obligated to do so. If you do not wish to do
29 so, delete this exception statement from your version. */
40 #include <sys/types.h>
62 /* Supported schemes: */
63 static struct scheme_data supported_schemes[] =
65 { "http://", DEFAULT_HTTP_PORT, 1 },
67 { "https://", DEFAULT_HTTPS_PORT, 1 },
69 { "ftp://", DEFAULT_FTP_PORT, 1 },
75 /* Forward declarations: */
77 static int path_simplify PARAMS ((char *));
79 /* Support for encoding and decoding of URL strings. We determine
80 whether a character is unsafe through static table lookup. This
81 code assumes ASCII character set and 8-bit chars. */
84 /* rfc1738 reserved chars, preserved from encoding. */
87 /* rfc1738 unsafe chars, plus some more. */
91 #define urlchr_test(c, mask) (urlchr_table[(unsigned char)(c)] & (mask))
92 #define URL_RESERVED_CHAR(c) urlchr_test(c, urlchr_reserved)
93 #define URL_UNSAFE_CHAR(c) urlchr_test(c, urlchr_unsafe)
95 /* Shorthands for the table: */
96 #define R urlchr_reserved
97 #define U urlchr_unsafe
100 const static unsigned char urlchr_table[256] =
102 U, U, U, U, U, U, U, U, /* NUL SOH STX ETX EOT ENQ ACK BEL */
103 U, U, U, U, U, U, U, U, /* BS HT LF VT FF CR SO SI */
104 U, U, U, U, U, U, U, U, /* DLE DC1 DC2 DC3 DC4 NAK SYN ETB */
105 U, U, U, U, U, U, U, U, /* CAN EM SUB ESC FS GS RS US */
106 U, 0, U, RU, 0, U, R, 0, /* SP ! " # $ % & ' */
107 0, 0, 0, R, 0, 0, 0, R, /* ( ) * + , - . / */
108 0, 0, 0, 0, 0, 0, 0, 0, /* 0 1 2 3 4 5 6 7 */
109 0, 0, RU, R, U, R, U, R, /* 8 9 : ; < = > ? */
110 RU, 0, 0, 0, 0, 0, 0, 0, /* @ A B C D E F G */
111 0, 0, 0, 0, 0, 0, 0, 0, /* H I J K L M N O */
112 0, 0, 0, 0, 0, 0, 0, 0, /* P Q R S T U V W */
113 0, 0, 0, RU, U, RU, U, 0, /* X Y Z [ \ ] ^ _ */
114 U, 0, 0, 0, 0, 0, 0, 0, /* ` a b c d e f g */
115 0, 0, 0, 0, 0, 0, 0, 0, /* h i j k l m n o */
116 0, 0, 0, 0, 0, 0, 0, 0, /* p q r s t u v w */
117 0, 0, 0, U, U, U, U, U, /* x y z { | } ~ DEL */
119 U, U, U, U, U, U, U, U, U, U, U, U, U, U, U, U,
120 U, U, U, U, U, U, U, U, U, U, U, U, U, U, U, U,
121 U, U, U, U, U, U, U, U, U, U, U, U, U, U, U, U,
122 U, U, U, U, U, U, U, U, U, U, U, U, U, U, U, U,
124 U, U, U, U, U, U, U, U, U, U, U, U, U, U, U, U,
125 U, U, U, U, U, U, U, U, U, U, U, U, U, U, U, U,
126 U, U, U, U, U, U, U, U, U, U, U, U, U, U, U, U,
127 U, U, U, U, U, U, U, U, U, U, U, U, U, U, U, U,
133 /* URL-unescape the string S.
135 This is done by transforming the sequences "%HH" to the character
136 represented by the hexadecimal digits HH. If % is not followed by
137 two hexadecimal digits, it is inserted literally.
139 The transformation is done in place. If you need the original
140 string intact, make a copy before calling this function. */
143 url_unescape (char *s)
145 char *t = s; /* t - tortoise */
146 char *h = s; /* h - hare */
157 /* Do nothing if '%' is not followed by two hex digits. */
158 if (!h[1] || !h[2] || !(ISXDIGIT (h[1]) && ISXDIGIT (h[2])))
160 *t = X2DIGITS_TO_NUM (h[1], h[2]);
167 /* The core of url_escape_* functions. Escapes the characters that
168 match the provided mask in urlchr_table.
170 If ALLOW_PASSTHROUGH is non-zero, a string with no unsafe chars
171 will be returned unchanged. If ALLOW_PASSTHROUGH is zero, a
172 freshly allocated string will be returned in all cases. */
175 url_escape_1 (const char *s, unsigned char mask, int allow_passthrough)
182 for (p1 = s; *p1; p1++)
183 if (urlchr_test (*p1, mask))
184 addition += 2; /* Two more characters (hex digits) */
187 return allow_passthrough ? (char *)s : xstrdup (s);
189 newlen = (p1 - s) + addition;
190 newstr = (char *)xmalloc (newlen + 1);
196 /* Quote the characters that match the test mask. */
197 if (urlchr_test (*p1, mask))
199 unsigned char c = *p1++;
201 *p2++ = XNUM_TO_DIGIT (c >> 4);
202 *p2++ = XNUM_TO_DIGIT (c & 0xf);
207 assert (p2 - newstr == newlen);
213 /* URL-escape the unsafe characters (see urlchr_table) in a given
214 string, returning a freshly allocated string. */
217 url_escape (const char *s)
219 return url_escape_1 (s, urlchr_unsafe, 0);
222 /* URL-escape the unsafe characters (see urlchr_table) in a given
223 string. If no characters are unsafe, S is returned. */
226 url_escape_allow_passthrough (const char *s)
228 return url_escape_1 (s, urlchr_unsafe, 1);
231 enum copy_method { CM_DECODE, CM_ENCODE, CM_PASSTHROUGH };
233 /* Decide whether to encode, decode, or pass through the char at P.
234 This used to be a macro, but it got a little too convoluted. */
235 static inline enum copy_method
236 decide_copy_method (const char *p)
240 if (ISXDIGIT (*(p + 1)) && ISXDIGIT (*(p + 2)))
242 /* %xx sequence: decode it, unless it would decode to an
243 unsafe or a reserved char; in that case, leave it as
245 char preempt = X2DIGITS_TO_NUM (*(p + 1), *(p + 2));
246 if (URL_UNSAFE_CHAR (preempt) || URL_RESERVED_CHAR (preempt))
247 return CM_PASSTHROUGH;
252 /* Garbled %.. sequence: encode `%'. */
255 else if (URL_UNSAFE_CHAR (*p) && !URL_RESERVED_CHAR (*p))
258 return CM_PASSTHROUGH;
261 /* Translate a %-escaped (but possibly non-conformant) input string S
262 into a %-escaped (and conformant) output string. If no characters
263 are encoded or decoded, return the same string S; otherwise, return
264 a freshly allocated string with the new contents.
266 After a URL has been run through this function, the protocols that
267 use `%' as the quote character can use the resulting string as-is,
268 while those that don't call url_unescape() to get to the intended
269 data. This function is also stable: after an input string is
270 transformed the first time, all further transformations of the
271 result yield the same result string.
273 Let's discuss why this function is needed.
275 Imagine Wget is to retrieve `http://abc.xyz/abc def'. Since a raw
276 space character would mess up the HTTP request, it needs to be
279 GET /abc%20def HTTP/1.0
281 It appears that the unsafe chars need to be quoted, for example
282 with url_escape. But what if we're requested to download
283 `abc%20def'? url_escape transforms "%" to "%25", which would leave
284 us with `abc%2520def'. This is incorrect -- since %-escapes are
285 part of URL syntax, "%20" is the correct way to denote a literal
286 space on the Wget command line. This leaves us in the conclusion
287 that in that case Wget should not call url_escape, but leave the
290 And what if the requested URI is `abc%20 def'? If we call
291 url_escape, we end up with `/abc%2520%20def', which is almost
292 certainly not intended. If we don't call url_escape, we are left
293 with the embedded space and cannot complete the request. What the
294 user meant was for Wget to request `/abc%20%20def', and this is
295 where reencode_escapes kicks in.
297 Wget used to solve this by first decoding %-quotes, and then
298 encoding all the "unsafe" characters found in the resulting string.
299 This was wrong because it didn't preserve certain URL special
300 (reserved) characters. For instance, URI containing "a%2B+b" (0x2b
301 == '+') would get translated to "a%2B%2Bb" or "a++b" depending on
302 whether we considered `+' reserved (it is). One of these results
303 is inevitable because by the second step we would lose information
304 on whether the `+' was originally encoded or not. Both results
305 were wrong because in CGI parameters + means space, while %2B means
306 literal plus. reencode_escapes correctly translates the above to
307 "a%2B+b", i.e. returns the original string.
309 This function uses an algorithm proposed by Anon Sricharoenchai:
311 1. Encode all URL_UNSAFE and the "%" that are not followed by 2
314 2. Decode all "%XX" except URL_UNSAFE, URL_RESERVED (";/?:@=&") and
317 ...except that this code conflates the two steps, and decides
318 whether to encode, decode, or pass through each character in turn.
319 The function still uses two passes, but their logic is the same --
320 the first pass exists merely for the sake of allocation. Another
321 small difference is that we include `+' to URL_RESERVED.
325 "http://abc.xyz/%20%3F%%36%31%25aa% a?a=%61+a%2Ba&b=b%26c%3Dc"
327 "http://abc.xyz/%20%3F%2561%25aa%25%20a?a=a+a%2Ba&b=b%26c%3Dc"
331 "foo bar" -> "foo%20bar"
332 "foo%20bar" -> "foo%20bar"
333 "foo %20bar" -> "foo%20%20bar"
334 "foo%%20bar" -> "foo%25%20bar" (0x25 == '%')
335 "foo%25%20bar" -> "foo%25%20bar"
336 "foo%2%20bar" -> "foo%252%20bar"
337 "foo+bar" -> "foo+bar" (plus is reserved!)
338 "foo%2b+bar" -> "foo%2b+bar" */
341 reencode_escapes (const char *s)
347 int encode_count = 0;
348 int decode_count = 0;
350 /* First, pass through the string to see if there's anything to do,
351 and to calculate the new length. */
352 for (p1 = s; *p1; p1++)
354 switch (decide_copy_method (p1))
367 if (!encode_count && !decode_count)
368 /* The string is good as it is. */
369 return (char *)s; /* C const model sucks. */
372 /* Each encoding adds two characters (hex digits), while each
373 decoding removes two characters. */
374 newlen = oldlen + 2 * (encode_count - decode_count);
375 newstr = xmalloc (newlen + 1);
382 switch (decide_copy_method (p1))
386 unsigned char c = *p1++;
388 *p2++ = XNUM_TO_DIGIT (c >> 4);
389 *p2++ = XNUM_TO_DIGIT (c & 0xf);
393 *p2++ = X2DIGITS_TO_NUM (p1[1], p1[2]);
394 p1 += 3; /* skip %xx */
401 assert (p2 - newstr == newlen);
405 /* Returns the scheme type if the scheme is supported, or
406 SCHEME_INVALID if not. */
409 url_scheme (const char *url)
413 for (i = 0; supported_schemes[i].leading_string; i++)
414 if (0 == strncasecmp (url, supported_schemes[i].leading_string,
415 strlen (supported_schemes[i].leading_string)))
417 if (supported_schemes[i].enabled)
418 return (enum url_scheme) i;
420 return SCHEME_INVALID;
423 return SCHEME_INVALID;
426 #define SCHEME_CHAR(ch) (ISALNUM (ch) || (ch) == '-' || (ch) == '+')
428 /* Return 1 if the URL begins with any "scheme", 0 otherwise. As
429 currently implemented, it returns true if URL begins with
433 url_has_scheme (const char *url)
437 /* The first char must be a scheme char. */
438 if (!*p || !SCHEME_CHAR (*p))
441 /* Followed by 0 or more scheme chars. */
442 while (*p && SCHEME_CHAR (*p))
444 /* Terminated by ':'. */
449 scheme_default_port (enum url_scheme scheme)
451 return supported_schemes[scheme].default_port;
455 scheme_disable (enum url_scheme scheme)
457 supported_schemes[scheme].enabled = 0;
460 /* Skip the username and password, if present here. The function
461 should *not* be called with the complete URL, but with the part
462 right after the scheme.
464 If no username and password are found, return 0. */
467 url_skip_credentials (const char *url)
469 /* Look for '@' that comes before terminators, such as '/', '?',
471 const char *p = (const char *)strpbrk (url, "@/?#;");
477 /* Parse credentials contained in [BEG, END). The region is expected
478 to have come from a URL and is unescaped. */
481 parse_credentials (const char *beg, const char *end, char **user, char **passwd)
487 return 0; /* empty user name */
489 colon = memchr (beg, ':', end - beg);
491 return 0; /* again empty user name */
495 *passwd = strdupdelim (colon + 1, end);
497 url_unescape (*passwd);
504 *user = strdupdelim (beg, userend);
505 url_unescape (*user);
509 /* Used by main.c: detect URLs written using the "shorthand" URL forms
510 popularized by Netscape and NcFTP. HTTP shorthands look like this:
512 www.foo.com[:port]/dir/file -> http://www.foo.com[:port]/dir/file
513 www.foo.com[:port] -> http://www.foo.com[:port]
515 FTP shorthands look like this:
517 foo.bar.com:dir/file -> ftp://foo.bar.com/dir/file
518 foo.bar.com:/absdir/file -> ftp://foo.bar.com//absdir/file
520 If the URL needs not or cannot be rewritten, return NULL. */
523 rewrite_shorthand_url (const char *url)
527 if (url_has_scheme (url))
530 /* Look for a ':' or '/'. The former signifies NcFTP syntax, the
532 for (p = url; *p && *p != ':' && *p != '/'; p++)
542 /* If the characters after the colon and before the next slash
543 or end of string are all digits, it's HTTP. */
545 for (pp = p + 1; ISDIGIT (*pp); pp++)
547 if (digits > 0 && (*pp == '/' || *pp == '\0'))
550 /* Prepend "ftp://" to the entire URL... */
551 res = xmalloc (6 + strlen (url) + 1);
552 sprintf (res, "ftp://%s", url);
553 /* ...and replace ':' with '/'. */
554 res[6 + (p - url)] = '/';
561 /* Just prepend "http://" to what we have. */
562 res = xmalloc (7 + strlen (url) + 1);
563 sprintf (res, "http://%s", url);
568 static void split_path PARAMS ((const char *, char **, char **));
570 /* Like strpbrk, with the exception that it returns the pointer to the
571 terminating zero (end-of-string aka "eos") if no matching character
574 Although I normally balk at Gcc-specific optimizations, it probably
575 makes sense here: glibc has optimizations that detect strpbrk being
576 called with literal string as ACCEPT and inline the search. That
577 optimization is defeated if strpbrk is hidden within the call to
578 another function. (And no, making strpbrk_or_eos inline doesn't
579 help because the check for literal accept is in the
584 #define strpbrk_or_eos(s, accept) ({ \
585 char *SOE_p = strpbrk (s, accept); \
587 SOE_p = (char *)s + strlen (s); \
591 #else /* not __GNUC__ */
594 strpbrk_or_eos (const char *s, const char *accept)
596 char *p = strpbrk (s, accept);
598 p = (char *)s + strlen (s);
603 /* Turn STR into lowercase; return non-zero if a character was
607 lowercase_str (char *str)
614 *str = TOLOWER (*str);
619 static char *parse_errors[] = {
620 #define PE_NO_ERROR 0
622 #define PE_UNSUPPORTED_SCHEME 1
623 "Unsupported scheme",
624 #define PE_EMPTY_HOST 2
626 #define PE_BAD_PORT_NUMBER 3
628 #define PE_INVALID_USER_NAME 4
630 #define PE_UNTERMINATED_IPV6_ADDRESS 5
631 "Unterminated IPv6 numeric address",
632 #define PE_IPV6_NOT_SUPPORTED 6
633 "IPv6 addresses not supported",
634 #define PE_INVALID_IPV6_ADDRESS 7
635 "Invalid IPv6 numeric address"
638 #define SETERR(p, v) do { \
644 /* The following two functions were adapted from glibc. */
647 is_valid_ipv4_address (const char *str, const char *end)
649 int saw_digit, octets;
659 if (ch >= '0' && ch <= '9') {
660 val = val * 10 + (ch - '0');
664 if (saw_digit == 0) {
669 } else if (ch == '.' && saw_digit == 1) {
683 static const int NS_INADDRSZ = 4;
684 static const int NS_IN6ADDRSZ = 16;
685 static const int NS_INT16SZ = 2;
688 is_valid_ipv6_address (const char *str, const char *end)
690 static const char xdigits[] = "0123456789abcdef";
703 /* Leading :: requires some special handling. */
707 if (str == end || *str != ':')
719 /* if ch is a number, add it to val. */
720 pch = strchr(xdigits, ch);
723 val |= (pch - xdigits);
730 /* if ch is a colon ... */
733 if (saw_xdigit == 0) {
738 } else if (str == end) {
741 if (tp > NS_IN6ADDRSZ - NS_INT16SZ)
749 /* if ch is a dot ... */
750 if (ch == '.' && (tp <= NS_IN6ADDRSZ - NS_INADDRSZ) &&
751 is_valid_ipv4_address(curtok, end) == 1) {
760 if (saw_xdigit == 1) {
761 if (tp > NS_IN6ADDRSZ - NS_INT16SZ)
766 if (colonp != NULL) {
767 if (tp == NS_IN6ADDRSZ)
772 if (tp != NS_IN6ADDRSZ)
781 Return a new struct url if successful, NULL on error. In case of
782 error, and if ERROR is not NULL, also set *ERROR to the appropriate
785 url_parse (const char *url, int *error)
789 int path_modified, host_modified;
791 enum url_scheme scheme;
793 const char *uname_b, *uname_e;
794 const char *host_b, *host_e;
795 const char *path_b, *path_e;
796 const char *params_b, *params_e;
797 const char *query_b, *query_e;
798 const char *fragment_b, *fragment_e;
801 char *user = NULL, *passwd = NULL;
805 scheme = url_scheme (url);
806 if (scheme == SCHEME_INVALID)
808 SETERR (error, PE_UNSUPPORTED_SCHEME);
812 url_encoded = reencode_escapes (url);
815 p += strlen (supported_schemes[scheme].leading_string);
817 p += url_skip_credentials (p);
820 /* scheme://user:pass@host[:port]... */
823 /* We attempt to break down the URL into the components path,
824 params, query, and fragment. They are ordered like this:
826 scheme://host[:port][/path][;params][?query][#fragment] */
828 params_b = params_e = NULL;
829 query_b = query_e = NULL;
830 fragment_b = fragment_e = NULL;
836 /* Handle IPv6 address inside square brackets. Ideally we'd
837 just look for the terminating ']', but rfc2732 mandates
838 rejecting invalid IPv6 addresses. */
840 /* The address begins after '['. */
842 host_e = strchr (host_b, ']');
846 SETERR (error, PE_UNTERMINATED_IPV6_ADDRESS);
851 /* Check if the IPv6 address is valid. */
852 if (!is_valid_ipv6_address(host_b, host_e))
854 SETERR (error, PE_INVALID_IPV6_ADDRESS);
858 /* Continue parsing after the closing ']'. */
861 SETERR (error, PE_IPV6_NOT_SUPPORTED);
867 p = strpbrk_or_eos (p, ":/;?#");
871 if (host_b == host_e)
873 SETERR (error, PE_EMPTY_HOST);
877 port = scheme_default_port (scheme);
880 const char *port_b, *port_e, *pp;
882 /* scheme://host:port/tralala */
886 p = strpbrk_or_eos (p, "/;?#");
889 if (port_b == port_e)
891 /* http://host:/whatever */
893 SETERR (error, PE_BAD_PORT_NUMBER);
897 for (port = 0, pp = port_b; pp < port_e; pp++)
901 /* http://host:12randomgarbage/blah */
903 SETERR (error, PE_BAD_PORT_NUMBER);
907 port = 10 * port + (*pp - '0');
915 p = strpbrk_or_eos (p, ";?#");
920 /* Path is not allowed not to exist. */
928 p = strpbrk_or_eos (p, "?#");
935 p = strpbrk_or_eos (p, "#");
938 /* Hack that allows users to use '?' (a wildcard character) in
939 FTP URLs without it being interpreted as a query string
941 if (scheme == SCHEME_FTP)
943 query_b = query_e = NULL;
956 if (uname_b != uname_e)
958 /* http://user:pass@host */
960 /* uname_b uname_e */
961 if (!parse_credentials (uname_b, uname_e - 1, &user, &passwd))
963 SETERR (error, PE_INVALID_USER_NAME);
968 u = (struct url *)xmalloc (sizeof (struct url));
969 memset (u, 0, sizeof (*u));
972 u->host = strdupdelim (host_b, host_e);
977 u->path = strdupdelim (path_b, path_e);
978 path_modified = path_simplify (u->path);
979 split_path (u->path, &u->dir, &u->file);
981 host_modified = lowercase_str (u->host);
984 u->params = strdupdelim (params_b, params_e);
986 u->query = strdupdelim (query_b, query_e);
988 u->fragment = strdupdelim (fragment_b, fragment_e);
990 if (path_modified || u->fragment || host_modified || path_b == path_e)
992 /* If we suspect that a transformation has rendered what
993 url_string might return different from URL_ENCODED, rebuild
994 u->url using url_string. */
995 u->url = url_string (u, 0);
997 if (url_encoded != url)
998 xfree ((char *) url_encoded);
1002 if (url_encoded == url)
1003 u->url = xstrdup (url);
1005 u->url = url_encoded;
1013 url_error (int error_code)
1015 assert (error_code >= 0 && error_code < countof (parse_errors));
1016 return parse_errors[error_code];
1019 /* Split PATH into DIR and FILE. PATH comes from the URL and is
1020 expected to be URL-escaped.
1022 The path is split into directory (the part up to the last slash)
1023 and file (the part after the last slash), which are subsequently
1024 unescaped. Examples:
1027 "foo/bar/baz" "foo/bar" "baz"
1028 "foo/bar/" "foo/bar" ""
1030 "foo/bar/baz%2fqux" "foo/bar" "baz/qux" (!)
1032 DIR and FILE are freshly allocated. */
1035 split_path (const char *path, char **dir, char **file)
1037 char *last_slash = strrchr (path, '/');
1040 *dir = xstrdup ("");
1041 *file = xstrdup (path);
1045 *dir = strdupdelim (path, last_slash);
1046 *file = xstrdup (last_slash + 1);
1048 url_unescape (*dir);
1049 url_unescape (*file);
1052 /* Note: URL's "full path" is the path with the query string and
1053 params appended. The "fragment" (#foo) is intentionally ignored,
1054 but that might be changed. For example, if the original URL was
1055 "http://host:port/foo/bar/baz;bullshit?querystring#uselessfragment",
1056 the full path will be "/foo/bar/baz;bullshit?querystring". */
1058 /* Return the length of the full path, without the terminating
1062 full_path_length (const struct url *url)
1066 #define FROB(el) if (url->el) len += 1 + strlen (url->el)
1077 /* Write out the full path. */
1080 full_path_write (const struct url *url, char *where)
1082 #define FROB(el, chr) do { \
1083 char *f_el = url->el; \
1085 int l = strlen (f_el); \
1087 memcpy (where, f_el, l); \
1099 /* Public function for getting the "full path". E.g. if u->path is
1100 "foo/bar" and u->query is "param=value", full_path will be
1101 "/foo/bar?param=value". */
1104 url_full_path (const struct url *url)
1106 int length = full_path_length (url);
1107 char *full_path = (char *)xmalloc(length + 1);
1109 full_path_write (url, full_path);
1110 full_path[length] = '\0';
1115 /* Escape unsafe and reserved characters, except for the slash
1119 url_escape_dir (const char *dir)
1121 char *newdir = url_escape_1 (dir, urlchr_unsafe | urlchr_reserved, 1);
1126 /* Unescape slashes in NEWDIR. */
1128 h = newdir; /* hare */
1129 t = newdir; /* tortoise */
1131 for (; *h; h++, t++)
1133 /* url_escape_1 having converted '/' to "%2F" exactly. */
1134 if (*h == '%' && h[1] == '2' && h[2] == 'F')
1147 /* Sync u->path and u->url with u->dir and u->file. Called after
1148 u->file or u->dir have been changed, typically by the FTP code. */
1151 sync_path (struct url *u)
1153 char *newpath, *efile, *edir;
1157 /* u->dir and u->file are not escaped. URL-escape them before
1158 reassembling them into u->path. That way, if they contain
1159 separators like '?' or even if u->file contains slashes, the
1160 path will be correctly assembled. (u->file can contain slashes
1161 if the URL specifies it with %2f, or if an FTP server returns
1163 edir = url_escape_dir (u->dir);
1164 efile = url_escape_1 (u->file, urlchr_unsafe | urlchr_reserved, 1);
1167 newpath = xstrdup (efile);
1170 int dirlen = strlen (edir);
1171 int filelen = strlen (efile);
1173 /* Copy "DIR/FILE" to newpath. */
1174 char *p = newpath = xmalloc (dirlen + 1 + filelen + 1);
1175 memcpy (p, edir, dirlen);
1178 memcpy (p, efile, filelen);
1187 if (efile != u->file)
1190 /* Regenerate u->url as well. */
1192 u->url = url_string (u, 0);
1195 /* Mutators. Code in ftp.c insists on changing u->dir and u->file.
1196 This way we can sync u->path and u->url when they get changed. */
1199 url_set_dir (struct url *url, const char *newdir)
1202 url->dir = xstrdup (newdir);
1207 url_set_file (struct url *url, const char *newfile)
1210 url->file = xstrdup (newfile);
1215 url_free (struct url *url)
1221 FREE_MAYBE (url->params);
1222 FREE_MAYBE (url->query);
1223 FREE_MAYBE (url->fragment);
1224 FREE_MAYBE (url->user);
1225 FREE_MAYBE (url->passwd);
1233 /* Create all the necessary directories for PATH (a file). Calls
1234 mkdirhier() internally. */
1236 mkalldirs (const char *path)
1243 p = path + strlen (path);
1244 for (; *p != '/' && p != path; p--)
1247 /* Don't create if it's just a file. */
1248 if ((p == path) && (*p != '/'))
1250 t = strdupdelim (path, p);
1252 /* Check whether the directory exists. */
1253 if ((stat (t, &st) == 0))
1255 if (S_ISDIR (st.st_mode))
1262 /* If the dir exists as a file name, remove it first. This
1263 is *only* for Wget to work with buggy old CERN http
1264 servers. Here is the scenario: When Wget tries to
1265 retrieve a directory without a slash, e.g.
1266 http://foo/bar (bar being a directory), CERN server will
1267 not redirect it too http://foo/bar/ -- it will generate a
1268 directory listing containing links to bar/file1,
1269 bar/file2, etc. Wget will lose because it saves this
1270 HTML listing to a file `bar', so it cannot create the
1271 directory. To work around this, if the file of the same
1272 name exists, we just remove it and create the directory
1274 DEBUGP (("Removing %s because of directory danger!\n", t));
1278 res = make_directory (t);
1280 logprintf (LOG_NOTQUIET, "%s: %s", t, strerror (errno));
1285 /* Functions for constructing the file name out of URL components. */
1287 /* A growable string structure, used by url_file_name and friends.
1288 This should perhaps be moved to utils.c.
1290 The idea is to have a convenient and efficient way to construct a
1291 string by having various functions append data to it. Instead of
1292 passing the obligatory BASEVAR, SIZEVAR and TAILPOS to all the
1293 functions in questions, we pass the pointer to this struct. */
1301 /* Ensure that the string can accept APPEND_COUNT more characters past
1302 the current TAIL position. If necessary, this will grow the string
1303 and update its allocated size. If the string is already large
1304 enough to take TAIL+APPEND_COUNT characters, this does nothing. */
1305 #define GROW(g, append_size) do { \
1306 struct growable *G_ = g; \
1307 DO_REALLOC (G_->base, G_->size, G_->tail + append_size, char); \
1310 /* Return the tail position of the string. */
1311 #define TAIL(r) ((r)->base + (r)->tail)
1313 /* Move the tail position by APPEND_COUNT characters. */
1314 #define TAIL_INCR(r, append_count) ((r)->tail += append_count)
1316 /* Append the string STR to DEST. NOTICE: the string in DEST is not
1320 append_string (const char *str, struct growable *dest)
1322 int l = strlen (str);
1324 memcpy (TAIL (dest), str, l);
1325 TAIL_INCR (dest, l);
1328 /* Append CH to DEST. For example, append_char (0, DEST)
1329 zero-terminates DEST. */
1332 append_char (char ch, struct growable *dest)
1336 TAIL_INCR (dest, 1);
1340 filechr_not_unix = 1, /* unusable on Unix, / and \0 */
1341 filechr_not_windows = 2, /* unusable on Windows, one of \|/<>?:*" */
1342 filechr_control = 4, /* a control character, e.g. 0-31 */
1345 #define FILE_CHAR_TEST(c, mask) (filechr_table[(unsigned char)(c)] & (mask))
1347 /* Shorthands for the table: */
1348 #define U filechr_not_unix
1349 #define W filechr_not_windows
1350 #define C filechr_control
1355 /* Table of characters unsafe under various conditions (see above).
1357 Arguably we could also claim `%' to be unsafe, since we use it as
1358 the escape character. If we ever want to be able to reliably
1359 translate file name back to URL, this would become important
1360 crucial. Right now, it's better to be minimal in escaping. */
1362 const static unsigned char filechr_table[256] =
1364 UWC, C, C, C, C, C, C, C, /* NUL SOH STX ETX EOT ENQ ACK BEL */
1365 C, C, C, C, C, C, C, C, /* BS HT LF VT FF CR SO SI */
1366 C, C, C, C, C, C, C, C, /* DLE DC1 DC2 DC3 DC4 NAK SYN ETB */
1367 C, C, C, C, C, C, C, C, /* CAN EM SUB ESC FS GS RS US */
1368 0, 0, W, 0, 0, 0, 0, 0, /* SP ! " # $ % & ' */
1369 0, 0, W, 0, 0, 0, 0, UW, /* ( ) * + , - . / */
1370 0, 0, 0, 0, 0, 0, 0, 0, /* 0 1 2 3 4 5 6 7 */
1371 0, 0, W, 0, W, 0, W, W, /* 8 9 : ; < = > ? */
1372 0, 0, 0, 0, 0, 0, 0, 0, /* @ A B C D E F G */
1373 0, 0, 0, 0, 0, 0, 0, 0, /* H I J K L M N O */
1374 0, 0, 0, 0, 0, 0, 0, 0, /* P Q R S T U V W */
1375 0, 0, 0, 0, W, 0, 0, 0, /* X Y Z [ \ ] ^ _ */
1376 0, 0, 0, 0, 0, 0, 0, 0, /* ` a b c d e f g */
1377 0, 0, 0, 0, 0, 0, 0, 0, /* h i j k l m n o */
1378 0, 0, 0, 0, 0, 0, 0, 0, /* p q r s t u v w */
1379 0, 0, 0, 0, 0, 0, 0, 0, /* x y z { | } ~ DEL */
1381 C, C, C, C, C, C, C, C, C, C, C, C, C, C, C, C, /* 128-143 */
1382 C, C, C, C, C, C, C, C, C, C, C, C, C, C, C, C, /* 144-159 */
1383 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1384 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1386 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1387 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1388 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1389 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1397 /* FN_PORT_SEP is the separator between host and port in file names
1398 for non-standard port numbers. On Unix this is normally ':', as in
1399 "www.xemacs.org:4001/index.html". Under Windows, we set it to +
1400 because Windows can't handle ':' in file names. */
1401 #define FN_PORT_SEP (opt.restrict_files_os != restrict_windows ? ':' : '+')
1403 /* FN_QUERY_SEP is the separator between the file name and the URL
1404 query, normally '?'. Since Windows cannot handle '?' as part of
1405 file name, we use '@' instead there. */
1406 #define FN_QUERY_SEP (opt.restrict_files_os != restrict_windows ? '?' : '@')
1408 /* Quote path element, characters in [b, e), as file name, and append
1409 the quoted string to DEST. Each character is quoted as per
1410 file_unsafe_char and the corresponding table. */
1413 append_uri_pathel (const char *b, const char *e, struct growable *dest)
1422 if (opt.restrict_files_os == restrict_unix)
1423 mask = filechr_not_unix;
1425 mask = filechr_not_windows;
1426 if (opt.restrict_files_ctrl)
1427 mask |= filechr_control;
1429 /* Copy [b, e) to PATHEL and URL-unescape it. */
1430 BOUNDED_TO_ALLOCA (b, e, pathel);
1431 url_unescape (pathel);
1432 pathlen = strlen (pathel);
1434 /* Go through PATHEL and check how many characters we'll need to
1435 add for file quoting. */
1437 for (p = pathel; *p; p++)
1438 if (FILE_CHAR_TEST (*p, mask))
1441 /* p - pathel is the string length. Each quoted char means two
1442 additional characters in the string, hence 2*quoted. */
1443 outlen = (p - pathel) + (2 * quoted);
1444 GROW (dest, outlen);
1448 /* If there's nothing to quote, we don't need to go through the
1449 string the second time. */
1450 memcpy (TAIL (dest), pathel, outlen);
1454 char *q = TAIL (dest);
1455 for (p = pathel; *p; p++)
1457 if (!FILE_CHAR_TEST (*p, mask))
1461 unsigned char ch = *p;
1463 *q++ = XNUM_TO_DIGIT (ch >> 4);
1464 *q++ = XNUM_TO_DIGIT (ch & 0xf);
1467 assert (q - TAIL (dest) == outlen);
1469 TAIL_INCR (dest, outlen);
1472 /* Append to DEST the directory structure that corresponds the
1473 directory part of URL's path. For example, if the URL is
1474 http://server/dir1/dir2/file, this appends "/dir1/dir2".
1476 Each path element ("dir1" and "dir2" in the above example) is
1477 examined, url-unescaped, and re-escaped as file name element.
1479 Additionally, it cuts as many directories from the path as
1480 specified by opt.cut_dirs. For example, if opt.cut_dirs is 1, it
1481 will produce "bar" for the above example. For 2 or more, it will
1484 Each component of the path is quoted for use as file name. */
1487 append_dir_structure (const struct url *u, struct growable *dest)
1489 char *pathel, *next;
1490 int cut = opt.cut_dirs;
1492 /* Go through the path components, de-URL-quote them, and quote them
1493 (if necessary) as file names. */
1496 for (; (next = strchr (pathel, '/')) != NULL; pathel = next + 1)
1501 /* Ignore empty pathels. path_simplify should remove
1502 occurrences of "//" from the path, but it has special cases
1503 for starting / which generates an empty pathel here. */
1507 append_char ('/', dest);
1508 append_uri_pathel (pathel, next, dest);
1512 /* Return a unique file name that matches the given URL as good as
1513 possible. Does not create directories on the file system. */
1516 url_file_name (const struct url *u)
1518 struct growable fnres;
1520 char *u_file, *u_query;
1521 char *fname, *unique;
1527 /* Start with the directory prefix, if specified. */
1529 append_string (opt.dir_prefix, &fnres);
1531 /* If "dirstruct" is turned on (typically the case with -r), add
1532 the host and port (unless those have been turned off) and
1533 directory structure. */
1536 if (opt.add_hostdir)
1539 append_char ('/', &fnres);
1540 append_string (u->host, &fnres);
1541 if (u->port != scheme_default_port (u->scheme))
1544 number_to_string (portstr, u->port);
1545 append_char (FN_PORT_SEP, &fnres);
1546 append_string (portstr, &fnres);
1550 append_dir_structure (u, &fnres);
1553 /* Add the file name. */
1555 append_char ('/', &fnres);
1556 u_file = *u->file ? u->file : "index.html";
1557 append_uri_pathel (u_file, u_file + strlen (u_file), &fnres);
1559 /* Append "?query" to the file name. */
1560 u_query = u->query && *u->query ? u->query : NULL;
1563 append_char (FN_QUERY_SEP, &fnres);
1564 append_uri_pathel (u_query, u_query + strlen (u_query), &fnres);
1567 /* Zero-terminate the file name. */
1568 append_char ('\0', &fnres);
1572 /* Check the cases in which the unique extensions are not used:
1573 1) Clobbering is turned off (-nc).
1574 2) Retrieval with regetting.
1575 3) Timestamping is used.
1576 4) Hierarchy is built.
1578 The exception is the case when file does exist and is a
1579 directory (see `mkalldirs' for explanation). */
1581 if ((opt.noclobber || opt.always_rest || opt.timestamping || opt.dirstruct)
1582 && !(file_exists_p (fname) && !file_non_directory_p (fname)))
1585 unique = unique_name (fname, 1);
1586 if (unique != fname)
1591 /* Return the length of URL's path. Path is considered to be
1592 terminated by one of '?', ';', '#', or by the end of the
1595 path_length (const char *url)
1597 const char *q = strpbrk_or_eos (url, "?;#");
1601 /* Find the last occurrence of character C in the range [b, e), or
1602 NULL, if none are present. This is equivalent to strrchr(b, c),
1603 except that it accepts an END argument instead of requiring the
1604 string to be zero-terminated. Why is there no memrchr()? */
1606 find_last_char (const char *b, const char *e, char c)
1614 /* Resolve "." and ".." elements of PATH by destructively modifying
1615 PATH and return non-zero if PATH has been modified, zero otherwise.
1617 The algorithm is in spirit similar to the one described in rfc1808,
1618 although implemented differently, in one pass. To recap, path
1619 elements containing only "." are removed, and ".." is taken to mean
1620 "back up one element". Single leading and trailing slashes are
1623 This function does not handle URL escapes explicitly. If you're
1624 passing paths from URLs, make sure to unquote "%2e" and "%2E" to
1625 ".", so that this function can find the dots. (Wget's URL parser
1626 calls reencode_escapes, which see.)
1628 For example, "a/b/c/./../d/.." will yield "a/b/". More exhaustive
1629 test examples are provided below. If you change anything in this
1630 function, run test_path_simplify to make sure you haven't broken a
1634 path_simplify (char *path)
1638 /* Preserve the leading '/'. */
1642 h = path; /* hare */
1643 t = path; /* tortoise */
1644 end = path + strlen (path);
1648 /* Hare should be at the beginning of a path element. */
1650 if (h[0] == '.' && (h[1] == '/' || h[1] == '\0'))
1655 else if (h[0] == '.' && h[1] == '.' && (h[2] == '/' || h[2] == '\0'))
1657 /* Handle "../" by retreating the tortoise by one path
1658 element -- but not past beggining of PATH. */
1661 /* Move backwards until B hits the beginning of the
1662 previous path element or the beginning of path. */
1663 for (--t; t > path && t[-1] != '/'; t--)
1670 /* Ignore empty path elements. Supporting them well is hard
1671 (where do you save "http://x.com///y.html"?), and they
1672 don't bring any practical gain. Plus, they break our
1673 filesystem-influenced assumptions: allowing them would
1674 make "x/y//../z" simplify to "x/y/z", whereas most people
1675 would expect "x/z". */
1680 /* A regular path element. If H hasn't advanced past T,
1681 simply skip to the next path element. Otherwise, copy
1682 the path element until the next slash. */
1685 /* Skip the path element, including the slash. */
1686 while (h < end && *h != '/')
1693 /* Copy the path element, including the final slash. */
1694 while (h < end && *h != '/')
1708 /* Merge BASE with LINK and return the resulting URI.
1710 Either of the URIs may be absolute or relative, complete with the
1711 host name, or path only. This tries to reasonably handle all
1712 foreseeable cases. It only employs minimal URL parsing, without
1713 knowledge of the specifics of schemes.
1715 Perhaps this function should call path_simplify so that the callers
1716 don't have to call url_parse unconditionally. */
1719 uri_merge (const char *base, const char *link)
1725 if (url_has_scheme (link))
1726 return xstrdup (link);
1728 /* We may not examine BASE past END. */
1729 end = base + path_length (base);
1730 linklength = strlen (link);
1734 /* Empty LINK points back to BASE, query string and all. */
1735 return xstrdup (base);
1737 else if (*link == '?')
1739 /* LINK points to the same location, but changes the query
1740 string. Examples: */
1741 /* uri_merge("path", "?new") -> "path?new" */
1742 /* uri_merge("path?foo", "?new") -> "path?new" */
1743 /* uri_merge("path?foo#bar", "?new") -> "path?new" */
1744 /* uri_merge("path#foo", "?new") -> "path?new" */
1745 int baselength = end - base;
1746 merge = xmalloc (baselength + linklength + 1);
1747 memcpy (merge, base, baselength);
1748 memcpy (merge + baselength, link, linklength);
1749 merge[baselength + linklength] = '\0';
1751 else if (*link == '#')
1753 /* uri_merge("path", "#new") -> "path#new" */
1754 /* uri_merge("path#foo", "#new") -> "path#new" */
1755 /* uri_merge("path?foo", "#new") -> "path?foo#new" */
1756 /* uri_merge("path?foo#bar", "#new") -> "path?foo#new" */
1758 const char *end1 = strchr (base, '#');
1760 end1 = base + strlen (base);
1761 baselength = end1 - base;
1762 merge = xmalloc (baselength + linklength + 1);
1763 memcpy (merge, base, baselength);
1764 memcpy (merge + baselength, link, linklength);
1765 merge[baselength + linklength] = '\0';
1767 else if (*link == '/' && *(link + 1) == '/')
1769 /* LINK begins with "//" and so is a net path: we need to
1770 replace everything after (and including) the double slash
1773 /* uri_merge("foo", "//new/bar") -> "//new/bar" */
1774 /* uri_merge("//old/foo", "//new/bar") -> "//new/bar" */
1775 /* uri_merge("http://old/foo", "//new/bar") -> "http://new/bar" */
1779 const char *start_insert;
1781 /* Look for first slash. */
1782 slash = memchr (base, '/', end - base);
1783 /* If found slash and it is a double slash, then replace
1784 from this point, else default to replacing from the
1786 if (slash && *(slash + 1) == '/')
1787 start_insert = slash;
1789 start_insert = base;
1791 span = start_insert - base;
1792 merge = (char *)xmalloc (span + linklength + 1);
1794 memcpy (merge, base, span);
1795 memcpy (merge + span, link, linklength);
1796 merge[span + linklength] = '\0';
1798 else if (*link == '/')
1800 /* LINK is an absolute path: we need to replace everything
1801 after (and including) the FIRST slash with LINK.
1803 So, if BASE is "http://host/whatever/foo/bar", and LINK is
1804 "/qux/xyzzy", our result should be
1805 "http://host/qux/xyzzy". */
1808 const char *start_insert = NULL; /* for gcc to shut up. */
1809 const char *pos = base;
1810 int seen_slash_slash = 0;
1811 /* We're looking for the first slash, but want to ignore
1814 slash = memchr (pos, '/', end - pos);
1815 if (slash && !seen_slash_slash)
1816 if (*(slash + 1) == '/')
1819 seen_slash_slash = 1;
1823 /* At this point, SLASH is the location of the first / after
1824 "//", or the first slash altogether. START_INSERT is the
1825 pointer to the location where LINK will be inserted. When
1826 examining the last two examples, keep in mind that LINK
1829 if (!slash && !seen_slash_slash)
1830 /* example: "foo" */
1832 start_insert = base;
1833 else if (!slash && seen_slash_slash)
1834 /* example: "http://foo" */
1837 else if (slash && !seen_slash_slash)
1838 /* example: "foo/bar" */
1840 start_insert = base;
1841 else if (slash && seen_slash_slash)
1842 /* example: "http://something/" */
1844 start_insert = slash;
1846 span = start_insert - base;
1847 merge = (char *)xmalloc (span + linklength + 1);
1849 memcpy (merge, base, span);
1850 memcpy (merge + span, link, linklength);
1851 merge[span + linklength] = '\0';
1855 /* LINK is a relative URL: we need to replace everything
1856 after last slash (possibly empty) with LINK.
1858 So, if BASE is "whatever/foo/bar", and LINK is "qux/xyzzy",
1859 our result should be "whatever/foo/qux/xyzzy". */
1860 int need_explicit_slash = 0;
1862 const char *start_insert;
1863 const char *last_slash = find_last_char (base, end, '/');
1866 /* No slash found at all. Append LINK to what we have,
1867 but we'll need a slash as a separator.
1869 Example: if base == "foo" and link == "qux/xyzzy", then
1870 we cannot just append link to base, because we'd get
1871 "fooqux/xyzzy", whereas what we want is
1874 To make sure the / gets inserted, we set
1875 need_explicit_slash to 1. We also set start_insert
1876 to end + 1, so that the length calculations work out
1877 correctly for one more (slash) character. Accessing
1878 that character is fine, since it will be the
1879 delimiter, '\0' or '?'. */
1880 /* example: "foo?..." */
1881 /* ^ ('?' gets changed to '/') */
1882 start_insert = end + 1;
1883 need_explicit_slash = 1;
1885 else if (last_slash && last_slash >= base + 2
1886 && last_slash[-2] == ':' && last_slash[-1] == '/')
1888 /* example: http://host" */
1890 start_insert = end + 1;
1891 need_explicit_slash = 1;
1895 /* example: "whatever/foo/bar" */
1897 start_insert = last_slash + 1;
1900 span = start_insert - base;
1901 merge = (char *)xmalloc (span + linklength + 1);
1903 memcpy (merge, base, span);
1904 if (need_explicit_slash)
1905 merge[span - 1] = '/';
1906 memcpy (merge + span, link, linklength);
1907 merge[span + linklength] = '\0';
1913 #define APPEND(p, s) do { \
1914 int len = strlen (s); \
1915 memcpy (p, s, len); \
1919 /* Use this instead of password when the actual password is supposed
1920 to be hidden. We intentionally use a generic string without giving
1921 away the number of characters in the password, like previous
1923 #define HIDDEN_PASSWORD "*password*"
1925 /* Recreate the URL string from the data in URL.
1927 If HIDE is non-zero (as it is when we're calling this on a URL we
1928 plan to print, but not when calling it to canonicalize a URL for
1929 use within the program), password will be hidden. Unsafe
1930 characters in the URL will be quoted. */
1933 url_string (const struct url *url, int hide_password)
1937 char *quoted_user = NULL, *quoted_passwd = NULL;
1939 int scheme_port = supported_schemes[url->scheme].default_port;
1940 char *scheme_str = supported_schemes[url->scheme].leading_string;
1941 int fplen = full_path_length (url);
1943 int brackets_around_host = 0;
1945 assert (scheme_str != NULL);
1947 /* Make sure the user name and password are quoted. */
1950 quoted_user = url_escape_allow_passthrough (url->user);
1954 quoted_passwd = HIDDEN_PASSWORD;
1956 quoted_passwd = url_escape_allow_passthrough (url->passwd);
1960 if (strchr (url->host, ':'))
1961 brackets_around_host = 1;
1963 size = (strlen (scheme_str)
1964 + strlen (url->host)
1965 + (brackets_around_host ? 2 : 0)
1968 if (url->port != scheme_port)
1969 size += 1 + numdigit (url->port);
1972 size += 1 + strlen (quoted_user);
1974 size += 1 + strlen (quoted_passwd);
1977 p = result = xmalloc (size);
1979 APPEND (p, scheme_str);
1982 APPEND (p, quoted_user);
1986 APPEND (p, quoted_passwd);
1991 if (brackets_around_host)
1993 APPEND (p, url->host);
1994 if (brackets_around_host)
1996 if (url->port != scheme_port)
1999 p = number_to_string (p, url->port);
2002 full_path_write (url, p);
2006 assert (p - result == size);
2008 if (quoted_user && quoted_user != url->user)
2009 xfree (quoted_user);
2010 if (quoted_passwd && !hide_password
2011 && quoted_passwd != url->passwd)
2012 xfree (quoted_passwd);
2017 /* Return non-zero if scheme a is similar to scheme b.
2019 Schemes are similar if they are equal. If SSL is supported, schemes
2020 are also similar if one is http (SCHEME_HTTP) and the other is https
2023 schemes_are_similar_p (enum url_scheme a, enum url_scheme b)
2028 if ((a == SCHEME_HTTP && b == SCHEME_HTTPS)
2029 || (a == SCHEME_HTTPS && b == SCHEME_HTTP))
2036 /* Debugging and testing support for path_simplify. */
2038 /* Debug: run path_simplify on PATH and return the result in a new
2039 string. Useful for calling from the debugger. */
2043 char *copy = xstrdup (path);
2044 path_simplify (copy);
2049 run_test (char *test, char *expected_result, int expected_change)
2051 char *test_copy = xstrdup (test);
2052 int modified = path_simplify (test_copy);
2054 if (0 != strcmp (test_copy, expected_result))
2056 printf ("Failed path_simplify(\"%s\"): expected \"%s\", got \"%s\".\n",
2057 test, expected_result, test_copy);
2059 if (modified != expected_change)
2061 if (expected_change == 1)
2062 printf ("Expected no modification with path_simplify(\"%s\").\n",
2065 printf ("Expected modification with path_simplify(\"%s\").\n",
2072 test_path_simplify (void)
2075 char *test, *result;
2081 { "foo", "foo", 0 },
2082 { "foo/bar", "foo/bar", 0 },
2083 { "foo///bar", "foo/bar", 1 },
2084 { "foo/.", "foo/", 1 },
2085 { "foo/./", "foo/", 1 },
2086 { "foo./", "foo./", 0 },
2087 { "foo/../bar", "bar", 1 },
2088 { "foo/../bar/", "bar/", 1 },
2089 { "foo/bar/..", "foo/", 1 },
2090 { "foo/bar/../x", "foo/x", 1 },
2091 { "foo/bar/../x/", "foo/x/", 1 },
2092 { "foo/..", "", 1 },
2093 { "foo/../..", "", 1 },
2094 { "a/b/../../c", "c", 1 },
2095 { "./a/../b", "b", 1 }
2099 for (i = 0; i < countof (tests); i++)
2101 char *test = tests[i].test;
2102 char *expected_result = tests[i].result;
2103 int expected_change = tests[i].should_modify;
2104 run_test (test, expected_result, expected_change);
2107 /* Now run all the tests with a leading slash before the test case,
2108 to prove that the slash is being preserved. */
2109 for (i = 0; i < countof (tests); i++)
2111 char *test, *expected_result;
2112 int expected_change = tests[i].should_modify;
2114 test = xmalloc (1 + strlen (tests[i].test) + 1);
2115 sprintf (test, "/%s", tests[i].test);
2117 expected_result = xmalloc (1 + strlen (tests[i].result) + 1);
2118 sprintf (expected_result, "/%s", tests[i].result);
2120 run_test (test, expected_result, expected_change);
2123 xfree (expected_result);