mirror of
https://github.com/netsurf-browser/netsurf
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b05bef4a61
Fix bug in url_up_re which caused /xy/../ not to be recognised when xy was 2 characters. Add defines for match part numbers. Simplify part 6(g) of url_join(). svn path=/import/netsurf/; revision=1704
652 lines
15 KiB
C
652 lines
15 KiB
C
/*
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* This file is part of NetSurf, http://netsurf.sourceforge.net/
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* Licensed under the GNU General Public License,
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* http://www.opensource.org/licenses/gpl-license
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* Copyright 2005 James Bursa <bursa@users.sourceforge.net>
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* Copyright 2005 John M Bell <jmb202@ecs.soton.ac.uk>
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*/
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/** \file
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* URL parsing and joining (implementation).
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*/
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#include <assert.h>
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#include <ctype.h>
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#include <stdbool.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/types.h>
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#include <regex.h>
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#include "netsurf/utils/log.h"
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#include "netsurf/utils/url.h"
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#include "netsurf/utils/utils.h"
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regex_t url_re, url_up_re, url_nice_re;
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/**
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* Initialise URL routines.
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*
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* Compiles regular expressions required by the url_ functions.
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*/
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void url_init(void)
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{
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/* regex from RFC 2396 */
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regcomp_wrapper(&url_re, "^[[:space:]]*"
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#define URL_RE_SCHEME 2
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"(([a-zA-Z][-a-zA-Z0-9+.]*):)?"
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#define URL_RE_AUTHORITY 4
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"(//([^/?#[:space:]]*))?"
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#define URL_RE_PATH 5
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"([^?#[:space:]]*)"
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#define URL_RE_QUERY 7
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"(\\?([^#[:space:]]*))?"
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#define URL_RE_FRAGMENT 9
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"(#([^[:space:]]*))?"
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"[[:space:]]*$", REG_EXTENDED);
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regcomp_wrapper(&url_up_re,
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"/([^/]|[.][^./]|[^./][.]|[^./][^./]|[^/][^/][^/]+)?"
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"/[.][.](/|$)",
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REG_EXTENDED);
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regcomp_wrapper(&url_nice_re,
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"^([^.]{0,4}[.])?([^.][^.][.])?([^/?&;.=]*)"
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"(=[^/?&;.]*)?[/?&;.]",
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REG_EXTENDED);
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}
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/**
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* Normalize a URL.
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*
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* \param url an absolute URL
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* \return cleaned up url, allocated on the heap, or 0 on failure
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*
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* If there is no scheme, http:// is added. The scheme and host are
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* lower-cased. Default ports are removed (http only). An empty path is
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* replaced with "/". Characters are unescaped if safe.
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*/
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url_func_result url_normalize(const char *url, char **result)
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{
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char c;
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int m;
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int i;
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size_t len;
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bool http = false;
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regmatch_t match[10];
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*result = NULL;
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if ((m = regexec(&url_re, url, 10, match, 0))) {
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LOG(("url '%s' failed to match regex", url));
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return URL_FUNC_FAILED;
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}
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len = strlen(url);
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if (match[URL_RE_SCHEME].rm_so == -1) {
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/* scheme missing: add http:// and reparse */
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/* LOG(("scheme missing: using http"));*/
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if ((*result = malloc(len + 13)) == NULL) {
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LOG(("malloc failed"));
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return URL_FUNC_NOMEM;
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}
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strcpy(*result, "http://");
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strcpy(*result + sizeof("http://")-1, url);
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if ((m = regexec(&url_re, *result, 10, match, 0))) {
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LOG(("url '%s' failed to match regex", (*result)));
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free(*result);
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return URL_FUNC_FAILED;
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}
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len += sizeof("http://")-1;
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} else {
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if ((*result = malloc(len + 6)) == NULL) {
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LOG(("malloc failed"));
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return URL_FUNC_NOMEM;
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}
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strcpy(*result, url);
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}
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/*for (unsigned int i = 0; i != 10; i++) {
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if (match[i].rm_so == -1)
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continue;
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fprintf(stderr, "%i: '%.*s'\n", i,
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match[i].rm_eo - match[i].rm_so,
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res + match[i].rm_so);
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}*/
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/* see RFC 2616 section 3.2.3 */
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/* make scheme lower-case */
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if (match[URL_RE_SCHEME].rm_so != -1) {
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for (i = match[URL_RE_SCHEME].rm_so;
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i != match[URL_RE_SCHEME].rm_eo; i++)
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(*result)[i] = tolower((*result)[i]);
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if (match[URL_RE_SCHEME].rm_eo == 4
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&& (*result)[0] == 'h'
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&& (*result)[1] == 't'
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&& (*result)[2] == 't'
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&& (*result)[3] == 'p')
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http = true;
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}
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/* make empty path into "/" */
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if (match[URL_RE_PATH].rm_so != -1 &&
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match[URL_RE_PATH].rm_so == match[URL_RE_PATH].rm_eo) {
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memmove((*result) + match[URL_RE_PATH].rm_so + 1,
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(*result) + match[URL_RE_PATH].rm_so,
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len - match[URL_RE_PATH].rm_so + 1);
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(*result)[match[URL_RE_PATH].rm_so] = '/';
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len++;
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}
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/* make host lower-case */
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if (match[URL_RE_AUTHORITY].rm_so != -1) {
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for (i = match[URL_RE_AUTHORITY].rm_so;
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i != match[URL_RE_AUTHORITY].rm_eo; i++) {
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if ((*result)[i] == ':') {
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if (http && (*result)[i + 1] == '8' &&
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(*result)[i + 2] == '0' &&
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i + 3 ==
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match[URL_RE_AUTHORITY].rm_eo) {
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memmove((*result) + i,
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(*result) + i + 3,
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len -
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match[URL_RE_AUTHORITY].
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rm_eo);
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len -= 3;
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(*result)[len] = '\0';
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} else if (i + 1 == match[4].rm_eo) {
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memmove((*result) + i,
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(*result) + i + 1,
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len -
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match[URL_RE_AUTHORITY].
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rm_eo);
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len--;
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(*result)[len] = '\0';
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}
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break;
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}
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(*result)[i] = tolower((*result)[i]);
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}
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}
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/* unescape non-"reserved" escaped characters */
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for (i = 0; (unsigned)i != len; i++) {
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if ((*result)[i] != '%')
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continue;
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c = tolower((*result)[i + 1]);
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if ('0' <= c && c <= '9')
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m = 16 * (c - '0');
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else if ('a' <= c && c <= 'f')
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m = 16 * (c - 'a' + 10);
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else
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continue;
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c = tolower((*result)[i + 2]);
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if ('0' <= c && c <= '9')
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m += c - '0';
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else if ('a' <= c && c <= 'f')
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m += c - 'a' + 10;
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else
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continue;
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if (m <= 0x20 || strchr(";/?:@&=+$," "<>#%\"{}|\\^[]`", m) ||
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m >= 0x7f) {
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i += 2;
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continue;
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}
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(*result)[i] = m;
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memmove((*result) + i + 1, (*result) + i + 3, len - i - 2);
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len -= 2;
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}
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return URL_FUNC_OK;
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}
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/**
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* Resolve a relative URL to absolute form.
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*
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* \param rel relative URL
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* \param base base URL, must be absolute and cleaned as by url_normalize()
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* \return an absolute URL, allocated on the heap, or 0 on failure
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*/
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url_func_result url_join(const char *rel, const char *base, char **result)
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{
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int m;
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int i, j;
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char *buf = 0;
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const char *scheme = 0, *authority = 0, *path = 0, *query = 0,
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*fragment = 0;
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int scheme_len = 0, authority_len = 0, path_len = 0, query_len = 0,
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fragment_len = 0;
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regmatch_t base_match[10];
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regmatch_t rel_match[10];
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regmatch_t up_match[3];
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(*result) = 0;
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/* see RFC 2396 section 5.2 */
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m = regexec(&url_re, base, 10, base_match, 0);
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if (m) {
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LOG(("base url '%s' failed to match regex", base));
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return URL_FUNC_FAILED;
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}
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/*for (unsigned int i = 0; i != 10; i++) {
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if (base_match[i].rm_so == -1)
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continue;
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fprintf(stderr, "%i: '%.*s'\n", i,
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base_match[i].rm_eo - base_match[i].rm_so,
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base + base_match[i].rm_so);
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}*/
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if (base_match[URL_RE_SCHEME].rm_so == -1) {
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LOG(("base url '%s' is not absolute", base));
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return URL_FUNC_FAILED;
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}
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scheme = base + base_match[URL_RE_SCHEME].rm_so;
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scheme_len = base_match[URL_RE_SCHEME].rm_eo -
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base_match[URL_RE_SCHEME].rm_so;
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if (base_match[URL_RE_AUTHORITY].rm_so != -1) {
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authority = base + base_match[URL_RE_AUTHORITY].rm_so;
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authority_len = base_match[URL_RE_AUTHORITY].rm_eo -
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base_match[URL_RE_AUTHORITY].rm_so;
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}
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path = base + base_match[URL_RE_PATH].rm_so;
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path_len = base_match[URL_RE_PATH].rm_eo -
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base_match[URL_RE_PATH].rm_so;
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/* 1) */
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m = regexec(&url_re, rel, 10, rel_match, 0);
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if (m) {
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LOG(("relative url '%s' failed to match regex", rel));
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return URL_FUNC_FAILED;
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}
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/* 2) */
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/* base + "#s" = (current document)#s (see Appendix C.1) */
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if (rel_match[URL_RE_FRAGMENT].rm_so != -1) {
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fragment = rel + rel_match[URL_RE_FRAGMENT].rm_so;
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fragment_len = rel_match[URL_RE_FRAGMENT].rm_eo -
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rel_match[URL_RE_FRAGMENT].rm_so;
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}
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if (rel_match[URL_RE_PATH].rm_so == rel_match[URL_RE_PATH].rm_eo &&
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rel_match[URL_RE_SCHEME].rm_so == -1 &&
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rel_match[URL_RE_AUTHORITY].rm_so == -1 &&
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rel_match[URL_RE_QUERY].rm_so == -1) {
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if (base_match[URL_RE_QUERY].rm_so != -1) {
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/* normally the base query is discarded, but this is a
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* "reference to the current document", so keep it */
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query = base + base_match[URL_RE_QUERY].rm_so;
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query_len = base_match[URL_RE_QUERY].rm_eo -
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base_match[URL_RE_QUERY].rm_so;
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}
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goto step7;
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}
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if (rel_match[URL_RE_QUERY].rm_so != -1) {
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query = rel + rel_match[URL_RE_QUERY].rm_so;
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query_len = rel_match[URL_RE_QUERY].rm_eo -
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rel_match[URL_RE_QUERY].rm_so;
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}
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/* base + "?y" = (base - query)?y
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* e.g http://a/b/c/d;p?q + ?y = http://a/b/c/d;p?y */
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if (rel_match[URL_RE_PATH].rm_so == rel_match[URL_RE_PATH].rm_eo &&
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rel_match[URL_RE_SCHEME].rm_so == -1 &&
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rel_match[URL_RE_AUTHORITY].rm_so == -1 &&
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rel_match[URL_RE_QUERY].rm_so != -1)
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goto step7;
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/* 3) */
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if (rel_match[URL_RE_SCHEME].rm_so != -1) {
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scheme = rel + rel_match[URL_RE_SCHEME].rm_so;
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scheme_len = rel_match[URL_RE_SCHEME].rm_eo -
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rel_match[URL_RE_SCHEME].rm_so;
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authority = 0;
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authority_len = 0;
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if (rel_match[URL_RE_AUTHORITY].rm_so != -1) {
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authority = rel + rel_match[URL_RE_AUTHORITY].rm_so;
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authority_len = rel_match[URL_RE_AUTHORITY].rm_eo -
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rel_match[URL_RE_AUTHORITY].rm_so;
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}
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path = rel + rel_match[URL_RE_PATH].rm_so;
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path_len = rel_match[URL_RE_PATH].rm_eo -
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rel_match[URL_RE_PATH].rm_so;
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goto step7;
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}
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/* 4) */
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if (rel_match[URL_RE_AUTHORITY].rm_so != -1) {
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authority = rel + rel_match[URL_RE_AUTHORITY].rm_so;
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authority_len = rel_match[URL_RE_AUTHORITY].rm_eo -
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rel_match[URL_RE_AUTHORITY].rm_so;
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path = rel + rel_match[URL_RE_PATH].rm_so;
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path_len = rel_match[URL_RE_PATH].rm_eo -
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rel_match[URL_RE_PATH].rm_so;
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goto step7;
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}
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/* 5) */
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if (rel[rel_match[URL_RE_PATH].rm_so] == '/') {
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path = rel + rel_match[URL_RE_PATH].rm_so;
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path_len = rel_match[URL_RE_PATH].rm_eo -
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rel_match[URL_RE_PATH].rm_so;
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goto step7;
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}
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/* 6) */
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buf = malloc(path_len + rel_match[URL_RE_PATH].rm_eo + 10);
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if (!buf) {
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LOG(("malloc failed"));
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return URL_FUNC_NOMEM;
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}
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/* a) */
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strncpy(buf, path, path_len);
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for (; path_len != 0 && buf[path_len - 1] != '/'; path_len--)
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;
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/* b) */
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strncpy(buf + path_len, rel + rel_match[URL_RE_PATH].rm_so,
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rel_match[URL_RE_PATH].rm_eo -
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rel_match[URL_RE_PATH].rm_so);
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path_len += rel_match[URL_RE_PATH].rm_eo - rel_match[URL_RE_PATH].rm_so;
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/* c) */
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buf[path_len] = 0;
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for (i = j = 0; j != path_len; ) {
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if (j && buf[j - 1] == '/' && buf[j] == '.' &&
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buf[j + 1] == '/')
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j += 2;
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else
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buf[i++] = buf[j++];
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}
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path_len = i;
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/* d) */
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if (2 <= path_len && buf[path_len - 2] == '/' &&
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buf[path_len - 1] == '.')
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path_len--;
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/* e) and f) */
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while (1) {
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buf[path_len] = 0;
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m = regexec(&url_up_re, buf, 3, up_match, 0);
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if (m)
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break;
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if (up_match[1].rm_eo + 4 <= path_len) {
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memmove(buf + up_match[1].rm_so,
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buf + up_match[1].rm_eo + 4,
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path_len - up_match[1].rm_eo - 4);
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path_len -= up_match[1].rm_eo - up_match[1].rm_so + 4;
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} else
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path_len -= up_match[1].rm_eo - up_match[1].rm_so + 3;
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}
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/* g) (choose to remove) */
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path = buf;
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while (3 <= path_len && path[1] == '.' && path[2] == '.') {
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path += 3;
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path_len -= 3;
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}
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buf[path - buf + path_len] = 0;
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step7: /* 7) */
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(*result) = malloc(scheme_len + 1 + 2 + authority_len + path_len + 1 +
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1 + query_len + 1 + fragment_len + 1);
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if (!(*result)) {
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LOG(("malloc failed"));
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free(buf);
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return URL_FUNC_NOMEM;
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}
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strncpy((*result), scheme, scheme_len);
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(*result)[scheme_len] = ':';
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i = scheme_len + 1;
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if (authority) {
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(*result)[i++] = '/';
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(*result)[i++] = '/';
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strncpy((*result) + i, authority, authority_len);
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i += authority_len;
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}
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if (path_len) {
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strncpy((*result) + i, path, path_len);
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i += path_len;
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} else {
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(*result)[i++] = '/';
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}
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if (query) {
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(*result)[i++] = '?';
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strncpy((*result) + i, query, query_len);
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i += query_len;
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}
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if (fragment) {
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(*result)[i++] = '#';
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strncpy((*result) + i, fragment, fragment_len);
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i += fragment_len;
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}
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(*result)[i] = 0;
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free(buf);
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return URL_FUNC_OK;
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}
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/**
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* Return the host name from an URL.
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*
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* \param url an absolute URL
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* \returns host name allocated on heap, or 0 on failure
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*/
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url_func_result url_host(const char *url, char **result)
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{
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int m;
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regmatch_t match[10];
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(*result) = 0;
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m = regexec(&url_re, url, 10, match, 0);
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if (m) {
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LOG(("url '%s' failed to match regex", url));
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return URL_FUNC_FAILED;
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}
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if (match[URL_RE_AUTHORITY].rm_so == -1)
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return URL_FUNC_FAILED;
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(*result) = malloc(match[URL_RE_AUTHORITY].rm_eo -
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match[URL_RE_AUTHORITY].rm_so + 1);
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if (!(*result)) {
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LOG(("malloc failed"));
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return URL_FUNC_NOMEM;
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}
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strncpy((*result), url + match[URL_RE_AUTHORITY].rm_so,
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match[URL_RE_AUTHORITY].rm_eo - match[4].rm_so);
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(*result)[match[URL_RE_AUTHORITY].rm_eo -
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|
match[URL_RE_AUTHORITY].rm_so] = 0;
|
|
|
|
return URL_FUNC_OK;
|
|
}
|
|
|
|
/**
|
|
* Return the scheme name from an URL
|
|
*
|
|
* \param url an absolute URL
|
|
* \param result pointer to pointer to buffer to hold scheme name
|
|
* \return URL_FUNC_OK on success
|
|
*/
|
|
url_func_result url_scheme(const char *url, char **result)
|
|
{
|
|
int m;
|
|
regmatch_t match[10];
|
|
|
|
(*result) = 0;
|
|
|
|
m = regexec(&url_re, url, 10, match, 0);
|
|
if (m) {
|
|
LOG(("url '%s' failed to match regex", url));
|
|
return URL_FUNC_FAILED;
|
|
}
|
|
if (match[URL_RE_SCHEME].rm_so == -1)
|
|
return URL_FUNC_FAILED;
|
|
|
|
(*result) = malloc(match[URL_RE_SCHEME].rm_eo -
|
|
match[URL_RE_SCHEME].rm_so + 1);
|
|
if (!(*result)) {
|
|
LOG(("malloc failed"));
|
|
return URL_FUNC_NOMEM;
|
|
}
|
|
|
|
strncpy((*result), url + match[URL_RE_SCHEME].rm_so,
|
|
match[URL_RE_SCHEME].rm_eo -
|
|
match[URL_RE_SCHEME].rm_so);
|
|
(*result)[match[URL_RE_SCHEME].rm_eo - match[URL_RE_SCHEME].rm_so] = 0;
|
|
|
|
return URL_FUNC_OK;
|
|
}
|
|
|
|
/**
|
|
* Attempt to find a nice filename for a URL.
|
|
*
|
|
* \param url an absolute URL
|
|
* \returns filename allocated on heap, or 0 on memory exhaustion
|
|
*/
|
|
|
|
url_func_result url_nice(const char *url, char **result)
|
|
{
|
|
unsigned int i, j, k = 0, so;
|
|
unsigned int len;
|
|
const char *colon;
|
|
char buf[40];
|
|
char *rurl;
|
|
int m;
|
|
regmatch_t match[10];
|
|
|
|
/* just in case */
|
|
(*result) = 0;
|
|
|
|
(*result) = malloc(40);
|
|
if (!(*result))
|
|
return URL_FUNC_NOMEM;
|
|
|
|
len = strlen(url);
|
|
assert(len != 0);
|
|
rurl = malloc(len + 1);
|
|
if (!rurl) {
|
|
free((*result));
|
|
return URL_FUNC_NOMEM;
|
|
}
|
|
|
|
/* reverse url into rurl */
|
|
for (i = 0, j = len - 1; i != len; i++, j--)
|
|
rurl[i] = url[j];
|
|
rurl[len] = 0;
|
|
|
|
/* prepare a fallback: always succeeds */
|
|
colon = strchr(url, ':');
|
|
if (colon)
|
|
url = colon + 1;
|
|
strncpy((*result), url, 15);
|
|
(*result)[15] = 0;
|
|
for (i = 0; (*result)[i]; i++)
|
|
if (!isalnum((*result)[i]))
|
|
(*result)[i] = '_';
|
|
|
|
/* append nice pieces */
|
|
j = 0;
|
|
do {
|
|
m = regexec(&url_nice_re, rurl + j, 10, match, 0);
|
|
if (m)
|
|
break;
|
|
|
|
if (match[3].rm_so != match[3].rm_eo) {
|
|
so = match[3].rm_so;
|
|
i = match[3].rm_eo - so;
|
|
if (15 < i) {
|
|
so = match[3].rm_eo - 15;
|
|
i = 15;
|
|
}
|
|
if (15 < k + i)
|
|
break;
|
|
if (k)
|
|
k++;
|
|
strncpy(buf + k, rurl + j + so, i);
|
|
k += i;
|
|
buf[k] = 160; /* nbsp */
|
|
}
|
|
|
|
j += match[0].rm_eo;
|
|
} while (j != len);
|
|
|
|
if (k == 0) {
|
|
free(rurl);
|
|
return URL_FUNC_OK;
|
|
}
|
|
|
|
/* reverse back */
|
|
for (i = 0, j = k - 1; i != k; i++, j--)
|
|
(*result)[i] = buf[j];
|
|
(*result)[k] = 0;
|
|
|
|
for (i = 0; i != k; i++)
|
|
if ((*result)[i] != (char) 0xa0 && !isalnum((*result)[i]))
|
|
(*result)[i] = '_';
|
|
|
|
free(rurl);
|
|
|
|
return URL_FUNC_OK;
|
|
}
|
|
|
|
|
|
|
|
#ifdef TEST
|
|
|
|
int main(int argc, char *argv[])
|
|
{
|
|
int i;
|
|
url_func_result res;
|
|
char *s;
|
|
url_init();
|
|
for (i = 1; i != argc; i++) {
|
|
/* printf("==> '%s'\n", argv[i]);
|
|
res = url_normalize(argv[i], &s);
|
|
if (res == URL_FUNC_OK) {
|
|
printf("<== '%s'\n", s);
|
|
free(s);
|
|
}*/
|
|
/* printf("==> '%s'\n", argv[i]);
|
|
res = url_host(argv[i], &s);
|
|
if (res == URL_FUNC_OK) {
|
|
printf("<== '%s'\n", s);
|
|
free(s);
|
|
}*/
|
|
if (1 != i) {
|
|
res = url_join(argv[i], argv[1], &s);
|
|
if (res == URL_FUNC_OK) {
|
|
printf("'%s' + '%s' \t= '%s'\n", argv[1],
|
|
argv[i], s);
|
|
free(s);
|
|
}
|
|
}
|
|
/* res = url_nice(argv[i], &s);
|
|
if (res == URL_FUNC_OK) {
|
|
printf("'%s'\n", s);
|
|
free(s);
|
|
}*/
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
void regcomp_wrapper(regex_t *preg, const char *regex, int cflags)
|
|
{
|
|
char errbuf[200];
|
|
int r;
|
|
r = regcomp(preg, regex, cflags);
|
|
if (r) {
|
|
regerror(r, preg, errbuf, sizeof errbuf);
|
|
fprintf(stderr, "Failed to compile regexp '%s'\n", regex);
|
|
fprintf(stderr, "error: %s\n", errbuf);
|
|
exit(1);
|
|
}
|
|
}
|
|
|
|
#endif
|