upload http

JIRA: BOTTLENECK-10

Change-Id: I7598427ff904df438ce77c2819ee48ac75ffa8da
Signed-off-by: hongbotian <hongbo.tianhongbo@huawei.com>

1 files changed, 4670 insertions, 0 deletions

diff --git a/rubbos/app/httpd-2.0.64/modules/mappers/mod_rewrite.c b/rubbos/app/httpd-2.0.64/modules/mappers/mod_rewrite.c
new file mode 100644
index 00000000..dcbac539
--- /dev/null
+++ b/rubbos/app/httpd-2.0.64/modules/mappers/mod_rewrite.c
@@ -0,0 +1,4670 @@
+/* Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/*                       _                            _ _
+**   _ __ ___   ___   __| |    _ __ _____      ___ __(_) |_ ___
+**  | '_ ` _ \ / _ \ / _` |   | '__/ _ \ \ /\ / / '__| | __/ _ \
+**  | | | | | | (_) | (_| |   | | |  __/\ V  V /| |  | | ||  __/
+**  |_| |_| |_|\___/ \__,_|___|_|  \___| \_/\_/ |_|  |_|\__\___|
+**                       |_____|
+**
+**  URL Rewriting Module
+**
+**  This module uses a rule-based rewriting engine (based on a
+**  regular-expression parser) to rewrite requested URLs on the fly.
+**
+**  It supports an unlimited number of additional rule conditions (which can
+**  operate on a lot of variables, even on HTTP headers) for granular
+**  matching and even external database lookups (either via plain text
+**  tables, DBM hash files or even external processes) for advanced URL
+**  substitution.
+**
+**  It operates on the full URLs (including the PATH_INFO part) both in
+**  per-server context (httpd.conf) and per-dir context (.htaccess) and even
+**  can generate QUERY_STRING parts on result.   The rewriting result finally
+**  can lead to internal subprocessing, external request redirection or even
+**  to internal proxy throughput.
+**
+**  This module was originally written in April 1996 and
+**  gifted exclusively to the The Apache Software Foundation in July 1997 by
+**
+**      Ralf S. Engelschall
+**      rse engelschall.com
+**      www.engelschall.com
+*/
+
+#include "apr.h"
+#include "apr_strings.h"
+#include "apr_hash.h"
+#include "apr_user.h"
+#include "apr_lib.h"
+#include "apr_signal.h"
+#include "apr_global_mutex.h"
+
+#define APR_WANT_STRFUNC
+#define APR_WANT_IOVEC
+#include "apr_want.h"
+
+#if APR_HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+#if APR_HAVE_SYS_TYPES_H
+#include <sys/types.h>
+#endif
+
+#include "ap_config.h"
+#include "httpd.h"
+#include "http_config.h"
+#include "http_request.h"
+#include "http_core.h"
+#include "http_log.h"
+#include "http_protocol.h"
+#include "mod_rewrite.h"
+
+/* mod_ssl.h is not safe for inclusion in 2.0, so duplicate the
+ * optional function declarations. */
+APR_DECLARE_OPTIONAL_FN(char *, ssl_var_lookup,
+                        (apr_pool_t *, server_rec *,
+                         conn_rec *, request_rec *,
+                         char *));
+APR_DECLARE_OPTIONAL_FN(int, ssl_is_https, (conn_rec *));
+
+#if !defined(OS2) && !defined(WIN32) && !defined(BEOS)  && !defined(NETWARE)
+#include "unixd.h"
+#define MOD_REWRITE_SET_MUTEX_PERMS /* XXX Apache should define something */
+#endif
+
+/*
+** +-------------------------------------------------------+
+** |                                                       |
+** |             static module configuration
+** |                                                       |
+** +-------------------------------------------------------+
+*/
+
+
+/*
+**  Our interface to the Apache server kernel:
+**
+**  o  Runtime logic of a request is as following:
+**       while(request or subrequest)
+**           foreach(stage #0...#9)
+**               foreach(module) (**)
+**                   try to run hook
+**
+**  o  the order of modules at (**) is the inverted order as
+**     given in the "Configuration" file, i.e. the last module
+**     specified is the first one called for each hook!
+**     The core module is always the last!
+**
+**  o  there are two different types of result checking and
+**     continue processing:
+**     for hook #0,#1,#4,#5,#6,#8:
+**         hook run loop stops on first modules which gives
+**         back a result != DECLINED, i.e. it usually returns OK
+**         which says "OK, module has handled this _stage_" and for #1
+**         this have not to mean "Ok, the filename is now valid".
+**     for hook #2,#3,#7,#9:
+**         all hooks are run, independend of result
+**
+**  o  at the last stage, the core module always
+**       - says "HTTP_BAD_REQUEST" if r->filename does not begin with "/"
+**       - prefix URL with document_root or replaced server_root
+**         with document_root and sets r->filename
+**       - always return a "OK" independed if the file really exists
+**         or not!
+*/
+
+    /* the module (predeclaration) */
+module AP_MODULE_DECLARE_DATA rewrite_module;
+
+    /* rewritemap int: handler function registry */
+static apr_hash_t *mapfunc_hash;
+
+    /* the cache */
+static cache *cachep;
+
+    /* whether proxy module is available or not */
+static int proxy_available;
+
+static const char *lockname;
+static apr_global_mutex_t *rewrite_mapr_lock_acquire = NULL;
+static apr_global_mutex_t *rewrite_log_lock = NULL;
+
+/* Optional functions imported from mod_ssl when loaded: */
+static APR_OPTIONAL_FN_TYPE(ssl_var_lookup) *rewrite_ssl_lookup = NULL;
+static APR_OPTIONAL_FN_TYPE(ssl_is_https) *rewrite_is_https = NULL;
+
+/*
+** +-------------------------------------------------------+
+** |                                                       |
+** |           configuration directive handling
+** |                                                       |
+** +-------------------------------------------------------+
+*/
+
+/*
+**
+**  per-server configuration structure handling
+**
+*/
+
+static void *config_server_create(apr_pool_t *p, server_rec *s)
+{
+    rewrite_server_conf *a;
+
+    a = (rewrite_server_conf *)apr_pcalloc(p, sizeof(rewrite_server_conf));
+
+    a->state           = ENGINE_DISABLED;
+    a->options         = OPTION_NONE;
+    a->rewritelogfile  = NULL;
+    a->rewritelogfp    = NULL;
+    a->rewriteloglevel = 0;
+    a->rewritemaps     = apr_array_make(p, 2, sizeof(rewritemap_entry));
+    a->rewriteconds    = apr_array_make(p, 2, sizeof(rewritecond_entry));
+    a->rewriterules    = apr_array_make(p, 2, sizeof(rewriterule_entry));
+    a->server          = s;
+    a->redirect_limit  = 0; /* unset (use default) */
+
+    return (void *)a;
+}
+
+static void *config_server_merge(apr_pool_t *p, void *basev, void *overridesv)
+{
+    rewrite_server_conf *a, *base, *overrides;
+
+    a         = (rewrite_server_conf *)apr_pcalloc(p,
+                                                   sizeof(rewrite_server_conf));
+    base      = (rewrite_server_conf *)basev;
+    overrides = (rewrite_server_conf *)overridesv;
+
+    a->state   = overrides->state;
+    a->options = overrides->options;
+    a->server  = overrides->server;
+    a->redirect_limit = overrides->redirect_limit
+                          ? overrides->redirect_limit
+                          : base->redirect_limit;
+
+    if (a->options & OPTION_INHERIT) {
+        /*
+         *  local directives override
+         *  and anything else is inherited
+         */
+        a->rewriteloglevel = overrides->rewriteloglevel != 0
+                             ? overrides->rewriteloglevel
+                             : base->rewriteloglevel;
+        a->rewritelogfile  = overrides->rewritelogfile != NULL
+                             ? overrides->rewritelogfile
+                             : base->rewritelogfile;
+        a->rewritelogfp    = overrides->rewritelogfp != NULL
+                             ? overrides->rewritelogfp
+                             : base->rewritelogfp;
+        a->rewritemaps     = apr_array_append(p, overrides->rewritemaps,
+                                              base->rewritemaps);
+        a->rewriteconds    = apr_array_append(p, overrides->rewriteconds,
+                                              base->rewriteconds);
+        a->rewriterules    = apr_array_append(p, overrides->rewriterules,
+                                              base->rewriterules);
+    }
+    else {
+        /*
+         *  local directives override
+         *  and anything else gets defaults
+         */
+        a->rewriteloglevel = overrides->rewriteloglevel;
+        a->rewritelogfile  = overrides->rewritelogfile;
+        a->rewritelogfp    = overrides->rewritelogfp;
+        a->rewritemaps     = overrides->rewritemaps;
+        a->rewriteconds    = overrides->rewriteconds;
+        a->rewriterules    = overrides->rewriterules;
+    }
+
+    return (void *)a;
+}
+
+
+/*
+**
+**  per-directory configuration structure handling
+**
+*/
+
+static void *config_perdir_create(apr_pool_t *p, char *path)
+{
+    rewrite_perdir_conf *a;
+
+    a = (rewrite_perdir_conf *)apr_pcalloc(p, sizeof(rewrite_perdir_conf));
+
+    a->state           = ENGINE_DISABLED;
+    a->options         = OPTION_NONE;
+    a->baseurl         = NULL;
+    a->rewriteconds    = apr_array_make(p, 2, sizeof(rewritecond_entry));
+    a->rewriterules    = apr_array_make(p, 2, sizeof(rewriterule_entry));
+    a->redirect_limit  = 0; /* unset (use server config) */
+
+    if (path == NULL) {
+        a->directory = NULL;
+    }
+    else {
+        /* make sure it has a trailing slash */
+        if (path[strlen(path)-1] == '/') {
+            a->directory = apr_pstrdup(p, path);
+        }
+        else {
+            a->directory = apr_pstrcat(p, path, "/", NULL);
+        }
+    }
+
+    return (void *)a;
+}
+
+static void *config_perdir_merge(apr_pool_t *p, void *basev, void *overridesv)
+{
+    rewrite_perdir_conf *a, *base, *overrides;
+
+    a         = (rewrite_perdir_conf *)apr_pcalloc(p,
+                                                  sizeof(rewrite_perdir_conf));
+    base      = (rewrite_perdir_conf *)basev;
+    overrides = (rewrite_perdir_conf *)overridesv;
+
+    a->state     = overrides->state;
+    a->options   = overrides->options;
+    a->directory = overrides->directory;
+    a->baseurl   = overrides->baseurl;
+    a->redirect_limit = overrides->redirect_limit
+                          ? overrides->redirect_limit
+                          : base->redirect_limit;
+
+    if (a->options & OPTION_INHERIT) {
+        a->rewriteconds = apr_array_append(p, overrides->rewriteconds,
+                                           base->rewriteconds);
+        a->rewriterules = apr_array_append(p, overrides->rewriterules,
+                                           base->rewriterules);
+    }
+    else {
+        a->rewriteconds = overrides->rewriteconds;
+        a->rewriterules = overrides->rewriterules;
+    }
+
+    return (void *)a;
+}
+
+
+/*
+**
+**  the configuration commands
+**
+*/
+
+static const char *cmd_rewriteengine(cmd_parms *cmd,
+                                     void *in_dconf, int flag)
+{
+    rewrite_perdir_conf *dconf = in_dconf;
+    rewrite_server_conf *sconf;
+
+    sconf = ap_get_module_config(cmd->server->module_config, &rewrite_module);
+
+    if (cmd->path == NULL) { /* is server command */
+        sconf->state = (flag ? ENGINE_ENABLED : ENGINE_DISABLED);
+    }
+    else                   /* is per-directory command */ {
+        dconf->state = (flag ? ENGINE_ENABLED : ENGINE_DISABLED);
+    }
+
+    return NULL;
+}
+
+static const char *cmd_rewriteoptions(cmd_parms *cmd,
+                                      void *in_dconf, const char *option)
+{
+    int options = 0, limit = 0;
+    char *w;
+
+    while (*option) {
+        w = ap_getword_conf(cmd->pool, &option);
+
+        if (!strcasecmp(w, "inherit")) {
+            options |= OPTION_INHERIT;
+        }
+        else if (!strncasecmp(w, "MaxRedirects=", 13)) {
+            limit = atoi(&w[13]);
+            if (limit <= 0) {
+                return "RewriteOptions: MaxRedirects takes a number greater "
+                       "than zero.";
+            }
+        }
+        else if (!strcasecmp(w, "MaxRedirects")) { /* be nice */
+            return "RewriteOptions: MaxRedirects has the format MaxRedirects"
+                   "=n.";
+        }
+        else {
+            return apr_pstrcat(cmd->pool, "RewriteOptions: unknown option '",
+                               w, "'", NULL);
+        }
+    }
+
+    /* put it into the appropriate config */
+    if (cmd->path == NULL) { /* is server command */
+        rewrite_server_conf *conf =
+            ap_get_module_config(cmd->server->module_config,
+                                 &rewrite_module);
+
+        conf->options |= options;
+        conf->redirect_limit = limit;
+    }
+    else {                  /* is per-directory command */
+        rewrite_perdir_conf *conf = in_dconf;
+
+        conf->options |= options;
+        conf->redirect_limit = limit;
+    }
+
+    return NULL;
+}
+
+static const char *cmd_rewritelog(cmd_parms *cmd, void *dconf, const char *a1)
+{
+    rewrite_server_conf *sconf;
+
+    sconf = ap_get_module_config(cmd->server->module_config, &rewrite_module);
+
+    sconf->rewritelogfile = a1;
+
+    return NULL;
+}
+
+static const char *cmd_rewriteloglevel(cmd_parms *cmd, void *dconf,
+                                       const char *a1)
+{
+    rewrite_server_conf *sconf;
+
+    sconf = ap_get_module_config(cmd->server->module_config, &rewrite_module);
+
+    sconf->rewriteloglevel = atoi(a1);
+
+    return NULL;
+}
+
+static const char *cmd_rewritemap(cmd_parms *cmd, void *dconf, const char *a1,
+                                  const char *a2)
+{
+    rewrite_server_conf *sconf;
+    rewritemap_entry *newmap;
+    apr_finfo_t st;
+
+    sconf = ap_get_module_config(cmd->server->module_config, &rewrite_module);
+
+    newmap = apr_array_push(sconf->rewritemaps);
+
+    newmap->name = a1;
+    newmap->func = NULL;
+    if (strncmp(a2, "txt:", 4) == 0) {
+        newmap->type      = MAPTYPE_TXT;
+        newmap->datafile  = a2+4;
+        newmap->checkfile = a2+4;
+        newmap->cachename = apr_psprintf(cmd->pool, "%pp:%s",
+                                         (void *)cmd->server, a1);
+    }
+    else if (strncmp(a2, "rnd:", 4) == 0) {
+        newmap->type      = MAPTYPE_RND;
+        newmap->datafile  = a2+4;
+        newmap->checkfile = a2+4;
+        newmap->cachename = apr_psprintf(cmd->pool, "%pp:%s",
+                                         (void *)cmd->server, a1);
+    }
+    else if (strncmp(a2, "dbm", 3) == 0) {
+        const char *ignored_fname;
+        int bad = 0;
+        apr_status_t rv;
+
+        newmap->type = MAPTYPE_DBM;
+        newmap->cachename = apr_psprintf(cmd->pool, "%pp:%s",
+                                         (void *)cmd->server, a1);
+
+        if (a2[3] == ':') {
+            newmap->dbmtype    = "default";
+            newmap->datafile   = a2+4;
+        }
+        else if (a2[3] == '=') {
+            const char *colon = ap_strchr_c(a2 + 4, ':');
+
+            if (colon) {
+                newmap->dbmtype = apr_pstrndup(cmd->pool, a2 + 4,
+                                               colon - (a2 + 3) - 1);
+                newmap->datafile = colon + 1;
+            }
+            else {
+                ++bad;
+            }
+        }
+        else {
+            ++bad;
+        }
+
+        if (bad) {
+            return apr_pstrcat(cmd->pool, "RewriteMap: bad map:",
+                               a2, NULL);
+        }
+
+        rv = apr_dbm_get_usednames_ex(cmd->pool, newmap->dbmtype,
+                                      newmap->datafile, &newmap->checkfile,
+                                      &ignored_fname);
+        if (rv != APR_SUCCESS) {
+            return apr_pstrcat(cmd->pool, "RewriteMap: dbm type ",
+                               newmap->dbmtype, " is invalid", NULL);
+        }
+    }
+    else if (strncmp(a2, "prg:", 4) == 0) {
+        newmap->type      = MAPTYPE_PRG;
+        apr_tokenize_to_argv(a2 + 4, &newmap->argv, cmd->pool);
+        newmap->datafile  = NULL;
+        newmap->checkfile = newmap->argv[0];
+        newmap->cachename = NULL;
+
+    }
+    else if (strncmp(a2, "int:", 4) == 0) {
+        newmap->type      = MAPTYPE_INT;
+        newmap->datafile  = NULL;
+        newmap->checkfile = NULL;
+        newmap->cachename = NULL;
+        newmap->func      = (char *(*)(request_rec *,char *))
+                            apr_hash_get(mapfunc_hash, a2+4, strlen(a2+4));
+        if ((sconf->state == ENGINE_ENABLED) && (newmap->func == NULL)) {
+            return apr_pstrcat(cmd->pool, "RewriteMap: internal map not found:",
+                               a2+4, NULL);
+        }
+    }
+    else {
+        newmap->type      = MAPTYPE_TXT;
+        newmap->datafile  = a2;
+        newmap->checkfile = a2;
+        newmap->cachename = apr_psprintf(cmd->pool, "%pp:%s",
+                                         (void *)cmd->server, a1);
+    }
+    newmap->fpin  = NULL;
+    newmap->fpout = NULL;
+
+    if (newmap->checkfile && (sconf->state == ENGINE_ENABLED)
+        && (apr_stat(&st, newmap->checkfile, APR_FINFO_MIN,
+                     cmd->pool) != APR_SUCCESS)) {
+        return apr_pstrcat(cmd->pool,
+                           "RewriteMap: file for map ", newmap->name,
+                           " not found:", newmap->checkfile, NULL);
+    }
+
+    return NULL;
+}
+
+static const char *cmd_rewritelock(cmd_parms *cmd, void *dconf, const char *a1)
+{
+    const char *error;
+
+    if ((error = ap_check_cmd_context(cmd, GLOBAL_ONLY)) != NULL)
+        return error;
+
+    /* fixup the path, especially for rewritelock_remove() */
+    lockname = ap_server_root_relative(cmd->pool, a1);
+
+    if (!lockname) {
+        return apr_pstrcat(cmd->pool, "Invalid RewriteLock path ", a1);
+    }
+
+    return NULL;
+}
+
+static const char *cmd_rewritebase(cmd_parms *cmd, void *in_dconf,
+                                   const char *a1)
+{
+    rewrite_perdir_conf *dconf = in_dconf;
+
+    if (cmd->path == NULL || dconf == NULL) {
+        return "RewriteBase: only valid in per-directory config files";
+    }
+    if (a1[0] == '\0') {
+        return "RewriteBase: empty URL not allowed";
+    }
+    if (a1[0] != '/') {
+        return "RewriteBase: argument is not a valid URL";
+    }
+
+    dconf->baseurl = a1;
+
+    return NULL;
+}
+
+static const char *cmd_rewritecond(cmd_parms *cmd, void *in_dconf,
+                                   const char *in_str)
+{
+    rewrite_perdir_conf *dconf = in_dconf;
+    char *str = apr_pstrdup(cmd->pool, in_str);
+    rewrite_server_conf *sconf;
+    rewritecond_entry *newcond;
+    regex_t *regexp;
+    char *a1;
+    char *a2;
+    char *a3;
+    char *cp;
+    const char *err;
+    int rc;
+
+    sconf = ap_get_module_config(cmd->server->module_config, &rewrite_module);
+
+    /*  make a new entry in the internal temporary rewrite rule list */
+    if (cmd->path == NULL) {   /* is server command */
+        newcond = apr_array_push(sconf->rewriteconds);
+    }
+    else {                     /* is per-directory command */
+        newcond = apr_array_push(dconf->rewriteconds);
+    }
+
+    /*  parse the argument line ourself */
+    if (parseargline(str, &a1, &a2, &a3)) {
+        return apr_pstrcat(cmd->pool, "RewriteCond: bad argument line '", str,
+                           "'", NULL);
+    }
+
+    /*  arg1: the input string */
+    newcond->input = apr_pstrdup(cmd->pool, a1);
+
+    /* arg3: optional flags field
+       (this have to be first parsed, because we need to
+        know if the regex should be compiled with ICASE!) */
+    newcond->flags = CONDFLAG_NONE;
+    if (a3 != NULL) {
+        if ((err = cmd_rewritecond_parseflagfield(cmd->pool, newcond,
+                                                  a3)) != NULL) {
+            return err;
+        }
+    }
+
+    /*  arg2: the pattern
+        try to compile the regexp to test if is ok */
+    cp = a2;
+    if (cp[0] == '!') {
+        newcond->flags |= CONDFLAG_NOTMATCH;
+        cp++;
+    }
+
+    /* now be careful: Under the POSIX regex library
+       we can compile the pattern for case insensitive matching,
+       under the old V8 library we have to do it self via a hack */
+    if (newcond->flags & CONDFLAG_NOCASE) {
+        rc = ((regexp = ap_pregcomp(cmd->pool, cp, REG_EXTENDED|REG_ICASE))
+              == NULL);
+    }
+    else {
+        rc = ((regexp = ap_pregcomp(cmd->pool, cp, REG_EXTENDED)) == NULL);
+    }
+    if (rc) {
+        return apr_pstrcat(cmd->pool,
+                           "RewriteCond: cannot compile regular expression '",
+                           a2, "'", NULL);
+    }
+
+    newcond->pattern = apr_pstrdup(cmd->pool, cp);
+    newcond->regexp  = regexp;
+
+    return NULL;
+}
+
+static const char *cmd_rewritecond_parseflagfield(apr_pool_t *p,
+                                                  rewritecond_entry *cfg,
+                                                  char *str)
+{
+    char *cp;
+    char *cp1;
+    char *cp2;
+    char *cp3;
+    char *key;
+    char *val;
+    const char *err;
+
+    if (str[0] != '[' || str[strlen(str)-1] != ']') {
+        return "RewriteCond: bad flag delimiters";
+    }
+
+    cp = str+1;
+    str[strlen(str)-1] = ','; /* for simpler parsing */
+    for ( ; *cp != '\0'; ) {
+        /* skip whitespaces */
+        for ( ; (*cp == ' ' || *cp == '\t') && *cp != '\0'; cp++)
+            ;
+        if (*cp == '\0') {
+            break;
+        }
+        cp1 = cp;
+        if ((cp2 = strchr(cp, ',')) != NULL) {
+            cp = cp2+1;
+            for ( ; (*(cp2-1) == ' ' || *(cp2-1) == '\t'); cp2--)
+                ;
+            *cp2 = '\0';
+            if ((cp3 = strchr(cp1, '=')) != NULL) {
+                *cp3 = '\0';
+                key = cp1;
+                val = cp3+1;
+            }
+            else {
+                key = cp1;
+                val = "";
+            }
+            if ((err = cmd_rewritecond_setflag(p, cfg, key, val)) != NULL) {
+                return err;
+            }
+        }
+        else {
+            break;
+        }
+    }
+
+    return NULL;
+}
+
+static const char *cmd_rewritecond_setflag(apr_pool_t *p,
+                                           rewritecond_entry *cfg,
+                                           char *key, char *val)
+{
+    if (   strcasecmp(key, "nocase") == 0
+        || strcasecmp(key, "NC") == 0    ) {
+        cfg->flags |= CONDFLAG_NOCASE;
+    }
+    else if (   strcasecmp(key, "ornext") == 0
+             || strcasecmp(key, "OR") == 0    ) {
+        cfg->flags |= CONDFLAG_ORNEXT;
+    }
+    else {
+        return apr_pstrcat(p, "RewriteCond: unknown flag '", key, "'", NULL);
+    }
+    return NULL;
+}
+
+static const char *cmd_rewriterule(cmd_parms *cmd, void *in_dconf,
+                                   const char *in_str)
+{
+    rewrite_perdir_conf *dconf = in_dconf;
+    char *str = apr_pstrdup(cmd->pool, in_str);
+    rewrite_server_conf *sconf;
+    rewriterule_entry *newrule;
+    regex_t *regexp;
+    char *a1;
+    char *a2;
+    char *a3;
+    char *cp;
+    const char *err;
+    int mode;
+
+    sconf = ap_get_module_config(cmd->server->module_config, &rewrite_module);
+
+    /*  make a new entry in the internal rewrite rule list */
+    if (cmd->path == NULL) {   /* is server command */
+        newrule = apr_array_push(sconf->rewriterules);
+    }
+    else {                     /* is per-directory command */
+        newrule = apr_array_push(dconf->rewriterules);
+    }
+
+    /*  parse the argument line ourself */
+    if (parseargline(str, &a1, &a2, &a3)) {
+        return apr_pstrcat(cmd->pool, "RewriteRule: bad argument line '", str,
+                           "'", NULL);
+    }
+
+    /* arg3: optional flags field */
+    newrule->forced_mimetype     = NULL;
+    newrule->forced_responsecode = HTTP_MOVED_TEMPORARILY;
+    newrule->flags  = RULEFLAG_NONE;
+    newrule->env[0] = NULL;
+    newrule->cookie[0] = NULL;
+    newrule->skip   = 0;
+    if (a3 != NULL) {
+        if ((err = cmd_rewriterule_parseflagfield(cmd->pool, newrule,
+                                                  a3)) != NULL) {
+            return err;
+        }
+    }
+
+    /*  arg1: the pattern
+     *  try to compile the regexp to test if is ok
+     */
+    cp = a1;
+    if (cp[0] == '!') {
+        newrule->flags |= RULEFLAG_NOTMATCH;
+        cp++;
+    }
+    mode = REG_EXTENDED;
+    if (newrule->flags & RULEFLAG_NOCASE) {
+        mode |= REG_ICASE;
+    }
+    if ((regexp = ap_pregcomp(cmd->pool, cp, mode)) == NULL) {
+        return apr_pstrcat(cmd->pool,
+                           "RewriteRule: cannot compile regular expression '",
+                           a1, "'", NULL);
+    }
+    newrule->pattern = apr_pstrdup(cmd->pool, cp);
+    newrule->regexp  = regexp;
+
+    /*  arg2: the output string
+     *  replace the $<N> by \<n> which is needed by the currently
+     *  used Regular Expression library
+     *
+     * TODO: Is this still required for PCRE?  If not, does it *work* with PCRE?
+     */
+    newrule->output = apr_pstrdup(cmd->pool, a2);
+
+    /* now, if the server or per-dir config holds an
+     * array of RewriteCond entries, we take it for us
+     * and clear the array
+     */
+    if (cmd->path == NULL) {  /* is server command */
+        newrule->rewriteconds   = sconf->rewriteconds;
+        sconf->rewriteconds = apr_array_make(cmd->pool, 2,
+                                            sizeof(rewritecond_entry));
+    }
+    else {                    /* is per-directory command */
+        newrule->rewriteconds   = dconf->rewriteconds;
+        dconf->rewriteconds = apr_array_make(cmd->pool, 2,
+                                            sizeof(rewritecond_entry));
+    }
+
+    return NULL;
+}
+
+static const char *cmd_rewriterule_parseflagfield(apr_pool_t *p,
+                                                  rewriterule_entry *cfg,
+                                                  char *str)
+{
+    char *cp;
+    char *cp1;
+    char *cp2;
+    char *cp3;
+    char *key;
+    char *val;
+    const char *err;
+
+    if (str[0] != '[' || str[strlen(str)-1] != ']') {
+        return "RewriteRule: bad flag delimiters";
+    }
+
+    cp = str+1;
+    str[strlen(str)-1] = ','; /* for simpler parsing */
+    for ( ; *cp != '\0'; ) {
+        /* skip whitespaces */
+        for ( ; (*cp == ' ' || *cp == '\t') && *cp != '\0'; cp++)
+            ;
+        if (*cp == '\0') {
+            break;
+        }
+        cp1 = cp;
+        if ((cp2 = strchr(cp, ',')) != NULL) {
+            cp = cp2+1;
+            for ( ; (*(cp2-1) == ' ' || *(cp2-1) == '\t'); cp2--)
+                ;
+            *cp2 = '\0';
+            if ((cp3 = strchr(cp1, '=')) != NULL) {
+                *cp3 = '\0';
+                key = cp1;
+                val = cp3+1;
+            }
+            else {
+                key = cp1;
+                val = "";
+            }
+            if ((err = cmd_rewriterule_setflag(p, cfg, key, val)) != NULL) {
+                return err;
+            }
+        }
+        else {
+            break;
+        }
+    }
+
+    return NULL;
+}
+
+static const char *cmd_rewriterule_setflag(apr_pool_t *p,
+                                           rewriterule_entry *cfg,
+                                           char *key, char *val)
+{
+    int status = 0;
+    int i;
+
+    if (   strcasecmp(key, "redirect") == 0
+        || strcasecmp(key, "R") == 0       ) {
+        cfg->flags |= RULEFLAG_FORCEREDIRECT;
+        if (strlen(val) > 0) {
+            if (strcasecmp(val, "permanent") == 0) {
+                status = HTTP_MOVED_PERMANENTLY;
+            }
+            else if (strcasecmp(val, "temp") == 0) {
+                status = HTTP_MOVED_TEMPORARILY;
+            }
+            else if (strcasecmp(val, "seeother") == 0) {
+                status = HTTP_SEE_OTHER;
+            }
+            else if (apr_isdigit(*val)) {
+                status = atoi(val);
+            }
+            if (!ap_is_HTTP_REDIRECT(status)) {
+                return "RewriteRule: invalid HTTP response code "
+                       "for flag 'R'";
+            }
+            cfg->forced_responsecode = status;
+        }
+    }
+    else if (   strcasecmp(key, "noescape") == 0
+        || strcasecmp(key, "NE") == 0       ) {
+        cfg->flags |= RULEFLAG_NOESCAPE;
+    }
+    else if (   strcasecmp(key, "last") == 0
+             || strcasecmp(key, "L") == 0   ) {
+        cfg->flags |= RULEFLAG_LASTRULE;
+    }
+    else if (   strcasecmp(key, "next") == 0
+             || strcasecmp(key, "N") == 0   ) {
+        cfg->flags |= RULEFLAG_NEWROUND;
+    }
+    else if (   strcasecmp(key, "chain") == 0
+             || strcasecmp(key, "C") == 0    ) {
+        cfg->flags |= RULEFLAG_CHAIN;
+    }
+    else if (   strcasecmp(key, "type") == 0
+             || strcasecmp(key, "T") == 0   ) {
+        cfg->forced_mimetype = apr_pstrdup(p, val);
+        ap_str_tolower(cfg->forced_mimetype);
+    }
+    else if (   strcasecmp(key, "env") == 0
+             || strcasecmp(key, "E") == 0   ) {
+        for (i = 0; (cfg->env[i] != NULL) && (i < MAX_ENV_FLAGS); i++)
+            ;
+        if (i < MAX_ENV_FLAGS) {
+            cfg->env[i] = apr_pstrdup(p, val);
+            cfg->env[i+1] = NULL;
+        }
+        else {
+            return "RewriteRule: too many environment flags 'E'";
+        }
+    }
+    else  if ( strcasecmp(key, "cookie") == 0 || strcasecmp(key, "CO") == 0) {
+        for (i = 0; (cfg->cookie[i] != NULL) && (i < MAX_COOKIE_FLAGS); i++)
+            ;
+        if (i < MAX_COOKIE_FLAGS) {
+            cfg->cookie[i] = apr_pstrdup(p, val);
+            cfg->cookie[i+1] = NULL;
+        }
+        else {
+            return "RewriteRule: too many cookie flags 'CO'";
+        }
+    }
+    else if (   strcasecmp(key, "nosubreq") == 0
+             || strcasecmp(key, "NS") == 0      ) {
+        cfg->flags |= RULEFLAG_IGNOREONSUBREQ;
+    }
+    else if (   strcasecmp(key, "proxy") == 0
+             || strcasecmp(key, "P") == 0      ) {
+        cfg->flags |= RULEFLAG_PROXY;
+    }
+    else if (   strcasecmp(key, "passthrough") == 0
+             || strcasecmp(key, "PT") == 0      ) {
+        cfg->flags |= RULEFLAG_PASSTHROUGH;
+    }
+    else if (   strcasecmp(key, "skip") == 0
+             || strcasecmp(key, "S") == 0   ) {
+        cfg->skip = atoi(val);
+    }
+    else if (   strcasecmp(key, "forbidden") == 0
+             || strcasecmp(key, "F") == 0   ) {
+        cfg->flags |= RULEFLAG_FORBIDDEN;
+    }
+    else if (   strcasecmp(key, "gone") == 0
+             || strcasecmp(key, "G") == 0   ) {
+        cfg->flags |= RULEFLAG_GONE;
+    }
+    else if (   strcasecmp(key, "qsappend") == 0
+             || strcasecmp(key, "QSA") == 0   ) {
+        cfg->flags |= RULEFLAG_QSAPPEND;
+    }
+    else if (   strcasecmp(key, "nocase") == 0
+             || strcasecmp(key, "NC") == 0    ) {
+        cfg->flags |= RULEFLAG_NOCASE;
+    }
+    else {
+        return apr_pstrcat(p, "RewriteRule: unknown flag '", key, "'", NULL);
+    }
+    return NULL;
+}
+
+
+/*
+**
+**  Global Module Initialization
+**
+*/
+
+static int pre_config(apr_pool_t *pconf,
+                      apr_pool_t *plog,
+                      apr_pool_t *ptemp)
+{
+    APR_OPTIONAL_FN_TYPE(ap_register_rewrite_mapfunc) *map_pfn_register;
+
+    /* register int: rewritemap handlers */
+    mapfunc_hash = apr_hash_make(pconf);
+    map_pfn_register = APR_RETRIEVE_OPTIONAL_FN(ap_register_rewrite_mapfunc);
+    if (map_pfn_register) {
+        map_pfn_register("tolower", rewrite_mapfunc_tolower);
+        map_pfn_register("toupper", rewrite_mapfunc_toupper);
+        map_pfn_register("escape", rewrite_mapfunc_escape);
+        map_pfn_register("unescape", rewrite_mapfunc_unescape);
+    }
+    return OK;
+}
+
+static int post_config(apr_pool_t *p,
+                       apr_pool_t *plog,
+                       apr_pool_t *ptemp,
+                       server_rec *s)
+{
+    apr_status_t rv;
+    void *data;
+    int first_time = 0;
+    const char *userdata_key = "rewrite_init_module";
+
+    apr_pool_userdata_get(&data, userdata_key, s->process->pool);
+    if (!data) {
+        first_time = 1;
+        apr_pool_userdata_set((const void *)1, userdata_key,
+                              apr_pool_cleanup_null, s->process->pool);
+    }
+
+    /* check if proxy module is available */
+    proxy_available = (ap_find_linked_module("mod_proxy.c") != NULL);
+
+    /* create the rewriting lockfiles in the parent */
+    if ((rv = apr_global_mutex_create(&rewrite_log_lock, NULL,
+                                      APR_LOCK_DEFAULT, p)) != APR_SUCCESS) {
+        ap_log_error(APLOG_MARK, APLOG_CRIT, rv, s,
+                     "mod_rewrite: could not create rewrite_log_lock");
+        return HTTP_INTERNAL_SERVER_ERROR;
+    }
+
+#ifdef MOD_REWRITE_SET_MUTEX_PERMS
+    rv = unixd_set_global_mutex_perms(rewrite_log_lock);
+    if (rv != APR_SUCCESS) {
+        ap_log_error(APLOG_MARK, APLOG_CRIT, rv, s,
+                     "mod_rewrite: Could not set permissions on "
+                     "rewrite_log_lock; check User and Group directives");
+        return HTTP_INTERNAL_SERVER_ERROR;
+    }
+#endif
+
+    rv = rewritelock_create(s, p);
+    if (rv != APR_SUCCESS) {
+        return HTTP_INTERNAL_SERVER_ERROR;
+    }
+
+    apr_pool_cleanup_register(p, (void *)s, rewritelock_remove,
+                              apr_pool_cleanup_null);
+
+    /* step through the servers and
+     * - open each rewriting logfile
+     * - open the RewriteMap prg:xxx programs
+     */
+    for (; s; s = s->next) {
+        if (!open_rewritelog(s, p)) {
+            return HTTP_INTERNAL_SERVER_ERROR;
+        }
+
+        if (!first_time) {
+            if (run_rewritemap_programs(s, p) != APR_SUCCESS) {
+                return HTTP_INTERNAL_SERVER_ERROR;
+            }
+        }
+    }
+
+    rewrite_ssl_lookup = APR_RETRIEVE_OPTIONAL_FN(ssl_var_lookup);
+    rewrite_is_https = APR_RETRIEVE_OPTIONAL_FN(ssl_is_https);
+
+    return OK;
+}
+
+
+/*
+**
+**  Per-Child Module Initialization
+**  [called after a child process is spawned]
+**
+*/
+
+static void init_child(apr_pool_t *p, server_rec *s)
+{
+    apr_status_t rv;
+
+    if (lockname != NULL && *(lockname) != '\0') {
+        rv = apr_global_mutex_child_init(&rewrite_mapr_lock_acquire,
+                                         lockname, p);
+        if (rv != APR_SUCCESS) {
+            ap_log_error(APLOG_MARK, APLOG_CRIT, rv, s,
+                         "mod_rewrite: could not init rewrite_mapr_lock_acquire"
+                         " in child");
+        }
+    }
+
+    rv = apr_global_mutex_child_init(&rewrite_log_lock, NULL, p);
+    if (rv != APR_SUCCESS) {
+        ap_log_error(APLOG_MARK, APLOG_CRIT, rv, s,
+                     "mod_rewrite: could not init rewrite log lock in child");
+    }
+    
+    /* create the lookup cache */
+    cachep = init_cache(p);
+}
+
+
+/*
+** +-------------------------------------------------------+
+** |                                                       |
+** |                     runtime hooks
+** |                                                       |
+** +-------------------------------------------------------+
+*/
+
+/*
+**
+**  URI-to-filename hook
+**
+**  [used for the rewriting engine triggered by
+**  the per-server 'RewriteRule' directives]
+**
+*/
+
+static int hook_uri2file(request_rec *r)
+{
+    rewrite_server_conf *conf;
+    const char *saved_rulestatus;
+    const char *var;
+    const char *thisserver;
+    char *thisport;
+    const char *thisurl;
+    char buf[512];
+    char docroot[512];
+    const char *ccp;
+    unsigned int port;
+    int rulestatus;
+    int n;
+    int l;
+
+    /*
+     *  retrieve the config structures
+     */
+    conf = ap_get_module_config(r->server->module_config, &rewrite_module);
+
+    /*
+     *  only do something under runtime if the engine is really enabled,
+     *  else return immediately!
+     */
+    if (conf->state == ENGINE_DISABLED) {
+        return DECLINED;
+    }
+
+    /*
+     *  check for the ugly API case of a virtual host section where no
+     *  mod_rewrite directives exists. In this situation we became no chance
+     *  by the API to setup our default per-server config so we have to
+     *  on-the-fly assume we have the default config. But because the default
+     *  config has a disabled rewriting engine we are lucky because can
+     *  just stop operating now.
+     */
+    if (conf->server != r->server) {
+        return DECLINED;
+    }
+
+    /*
+     *  add the SCRIPT_URL variable to the env. this is a bit complicated
+     *  due to the fact that apache uses subrequests and internal redirects
+     */
+
+    if (r->main == NULL) {
+         var = apr_pstrcat(r->pool, "REDIRECT_", ENVVAR_SCRIPT_URL, NULL);
+         var = apr_table_get(r->subprocess_env, var);
+         if (var == NULL) {
+             apr_table_setn(r->subprocess_env, ENVVAR_SCRIPT_URL, r->uri);
+         }
+         else {
+             apr_table_setn(r->subprocess_env, ENVVAR_SCRIPT_URL, var);
+         }
+    }
+    else {
+         var = apr_table_get(r->main->subprocess_env, ENVVAR_SCRIPT_URL);
+         apr_table_setn(r->subprocess_env, ENVVAR_SCRIPT_URL, var);
+    }
+
+    /*
+     *  create the SCRIPT_URI variable for the env
+     */
+
+    /* add the canonical URI of this URL */
+    thisserver = ap_get_server_name(r);
+    port = ap_get_server_port(r);
+    if (ap_is_default_port(port, r)) {
+        thisport = "";
+    }
+    else {
+        apr_snprintf(buf, sizeof(buf), ":%u", port);
+        thisport = buf;
+    }
+    thisurl = apr_table_get(r->subprocess_env, ENVVAR_SCRIPT_URL);
+
+    /* set the variable */
+    var = apr_pstrcat(r->pool, ap_http_method(r), "://", thisserver, thisport,
+                      thisurl, NULL);
+    apr_table_setn(r->subprocess_env, ENVVAR_SCRIPT_URI, var);
+
+    if (!(saved_rulestatus = apr_table_get(r->notes,"mod_rewrite_rewritten"))) {
+        /* if filename was not initially set,
+         * we start with the requested URI
+         */
+        if (r->filename == NULL) {
+            r->filename = apr_pstrdup(r->pool, r->uri);
+            rewritelog(r, 2, "init rewrite engine with requested uri %s",
+                       r->filename);
+        }
+        else {
+            rewritelog(r, 2, "init rewrite engine with passed filename %s."
+                       " Original uri = %s", r->filename, r->uri);
+        }
+
+        /*
+         *  now apply the rules ...
+         */
+        rulestatus = apply_rewrite_list(r, conf->rewriterules, NULL);
+        apr_table_set(r->notes,"mod_rewrite_rewritten",
+                      apr_psprintf(r->pool,"%d",rulestatus));
+    }
+    else {
+        rewritelog(r, 2,
+                   "uri already rewritten. Status %s, Uri %s, r->filename %s",
+                   saved_rulestatus, r->uri, r->filename);
+        rulestatus = atoi(saved_rulestatus);
+    }
+
+    if (rulestatus) {
+        unsigned skip;
+
+        if (strlen(r->filename) > 6 &&
+            strncmp(r->filename, "proxy:", 6) == 0) {
+            /* it should be go on as an internal proxy request */
+
+            /* check if the proxy module is enabled, so
+             * we can actually use it!
+             */
+            if (!proxy_available) {
+                ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
+                              "attempt to make remote request from mod_rewrite "
+                              "without proxy enabled: %s", r->filename);
+                return HTTP_FORBIDDEN;
+            }
+
+            /* make sure the QUERY_STRING and
+             * PATH_INFO parts get incorporated
+             */
+            if (r->path_info != NULL) {
+                r->filename = apr_pstrcat(r->pool, r->filename,
+                                          r->path_info, NULL);
+            }
+            if (r->args != NULL &&
+                r->uri == r->unparsed_uri) {
+                /* see proxy_http:proxy_http_canon() */
+                r->filename = apr_pstrcat(r->pool, r->filename,
+                                          "?", r->args, NULL);
+            }
+
+            /* now make sure the request gets handled by the proxy handler */
+            if (PROXYREQ_NONE == r->proxyreq) {
+                r->proxyreq = PROXYREQ_REVERSE;
+            }
+            r->handler  = "proxy-server";
+
+            rewritelog(r, 1, "go-ahead with proxy request %s [OK]",
+                       r->filename);
+            return OK;
+        }
+        else if ((skip = is_absolute_uri(r->filename)) > 0) {
+            /* it was finally rewritten to a remote URL */
+
+            if (rulestatus != ACTION_NOESCAPE) {
+                rewritelog(r, 1, "escaping %s for redirect", r->filename);
+                r->filename = escape_absolute_uri(r->pool, r->filename, skip);
+            }
+
+            /* append the QUERY_STRING part */
+            if (r->args) {
+                r->filename = apr_pstrcat(r->pool, r->filename, "?",
+                                          (rulestatus == ACTION_NOESCAPE)
+                                            ? r->args
+                                            : ap_escape_uri(r->pool, r->args),
+                                          NULL);
+            }
+
+            /* determine HTTP redirect response code */
+            if (ap_is_HTTP_REDIRECT(r->status)) {
+                n = r->status;
+                r->status = HTTP_OK; /* make Apache kernel happy */
+            }
+            else {
+                n = HTTP_MOVED_TEMPORARILY;
+            }
+
+            /* now do the redirection */
+            apr_table_setn(r->headers_out, "Location", r->filename);
+            rewritelog(r, 1, "redirect to %s [REDIRECT/%d]", r->filename, n);
+            return n;
+        }
+        else if (strlen(r->filename) > 10 &&
+                 strncmp(r->filename, "forbidden:", 10) == 0) {
+            /* This URLs is forced to be forbidden for the requester */
+            return HTTP_FORBIDDEN;
+        }
+        else if (strlen(r->filename) > 5 &&
+                 strncmp(r->filename, "gone:", 5) == 0) {
+            /* This URLs is forced to be gone */
+            return HTTP_GONE;
+        }
+        else if (strlen(r->filename) > 12 &&
+                 strncmp(r->filename, "passthrough:", 12) == 0) {
+            /*
+             * Hack because of underpowered API: passing the current
+             * rewritten filename through to other URL-to-filename handlers
+             * just as it were the requested URL. This is to enable
+             * post-processing by mod_alias, etc.  which always act on
+             * r->uri! The difference here is: We do not try to
+             * add the document root
+             */
+            r->uri = apr_pstrdup(r->pool, r->filename+12);
+            return DECLINED;
+        }
+        else {
+            /* it was finally rewritten to a local path */
+
+            /* expand "/~user" prefix */
+#if APR_HAS_USER
+            r->filename = expand_tildepaths(r, r->filename);
+#endif
+            rewritelog(r, 2, "local path result: %s", r->filename);
+
+            /* the filename must be either an absolute local path or an
+             * absolute local URL.
+             */
+            if (   *r->filename != '/'
+                && !ap_os_is_path_absolute(r->pool, r->filename)) {
+                return HTTP_BAD_REQUEST;
+            }
+
+            /* if there is no valid prefix, we have
+             * to emulate the translator from the core and
+             * prefix the filename with document_root
+             *
+             * NOTICE:
+             * We cannot leave out the prefix_stat because
+             * - when we always prefix with document_root
+             *   then no absolute path can be created, e.g. via
+             *   emulating a ScriptAlias directive, etc.
+             * - when we always NOT prefix with document_root
+             *   then the files under document_root have to
+             *   be references directly and document_root
+             *   gets never used and will be a dummy parameter -
+             *   this is also bad
+             *
+             * BUT:
+             * Under real Unix systems this is no problem,
+             * because we only do stat() on the first directory
+             * and this gets cached by the kernel for along time!
+             */
+            n = prefix_stat(r->filename, r->pool);
+            if (n == 0) {
+                if ((ccp = ap_document_root(r)) != NULL) {
+                    l = apr_cpystrn(docroot, ccp, sizeof(docroot)) - docroot;
+
+                    /* always NOT have a trailing slash */
+                    if (docroot[l-1] == '/') {
+                        docroot[l-1] = '\0';
+                    }
+                    if (r->server->path
+                        && !strncmp(r->filename, r->server->path,
+                                    r->server->pathlen)) {
+                        r->filename = apr_pstrcat(r->pool, docroot,
+                                                  (r->filename +
+                                                   r->server->pathlen), NULL);
+                    }
+                    else {
+                        r->filename = apr_pstrcat(r->pool, docroot,
+                                                  r->filename, NULL);
+                    }
+                    rewritelog(r, 2, "prefixed with document_root to %s",
+                               r->filename);
+                }
+            }
+
+            rewritelog(r, 1, "go-ahead with %s [OK]", r->filename);
+            return OK;
+        }
+    }
+    else {
+        rewritelog(r, 1, "pass through %s", r->filename);
+        return DECLINED;
+    }
+}
+
+
+/*
+**
+**  MIME-type hook
+**
+**  [used to support the forced-MIME-type feature]
+**
+*/
+
+static int hook_mimetype(request_rec *r)
+{
+    const char *t;
+
+    /* now check if we have to force a MIME-type */
+    t = apr_table_get(r->notes, REWRITE_FORCED_MIMETYPE_NOTEVAR);
+    if (t == NULL) {
+        return DECLINED;
+    }
+    else {
+        rewritelog(r, 1, "force filename %s to have MIME-type '%s'",
+                   r->filename, t);
+        ap_set_content_type(r, t);
+        return OK;
+    }
+}
+
+
+/*
+**
+**  Fixup hook
+**
+**  [used for the rewriting engine triggered by
+**  the per-directory 'RewriteRule' directives]
+**
+*/
+
+static int hook_fixup(request_rec *r)
+{
+    rewrite_perdir_conf *dconf;
+    char *cp;
+    char *cp2;
+    const char *ccp;
+    char *prefix;
+    apr_size_t l;
+    int rulestatus;
+    int n;
+    char *ofilename;
+    int is_proxyreq;
+
+    dconf = (rewrite_perdir_conf *)ap_get_module_config(r->per_dir_config,
+                                                        &rewrite_module);
+
+    /* if there is no per-dir config we return immediately */
+    if (dconf == NULL) {
+        return DECLINED;
+    }
+
+    /* we shouldn't do anything in subrequests */
+    if (r->main != NULL) {
+        return DECLINED;
+    }
+
+    /* if there are no real (i.e. no RewriteRule directives!)
+       per-dir config of us, we return also immediately */
+    if (dconf->directory == NULL) {
+        return DECLINED;
+    }
+
+    /*
+     * Proxy request?
+     */
+  	is_proxyreq = (   r->proxyreq && r->filename
+  	               && !strncmp(r->filename, "proxy:", 6));
+
+    /*
+     *  .htaccess file is called before really entering the directory, i.e.:
+     *  URL: http://localhost/foo  and .htaccess is located in foo directory
+     *  Ignore such attempts, since they may lead to undefined behaviour.
+     */
+    if (is_proxyreq) {
+        l = strlen(dconf->directory) - 1;
+        if (r->filename && strlen(r->filename) == l &&
+            (dconf->directory)[l] == '/' &&
+            !strncmp(r->filename, dconf->directory, l)) {
+            return DECLINED;
+        }
+    }
+
+    /*
+     *  only do something under runtime if the engine is really enabled,
+     *  for this directory, else return immediately!
+     */
+    if (dconf->state == ENGINE_DISABLED) {
+        return DECLINED;
+    }
+
+    /*
+     *  Do the Options check after engine check, so
+     *  the user is able to explicitely turn RewriteEngine Off.
+     */
+    if (!(ap_allow_options(r) & (OPT_SYM_LINKS | OPT_SYM_OWNER))) {
+        /* FollowSymLinks is mandatory! */
+        ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
+                     "Options FollowSymLinks or SymLinksIfOwnerMatch is off "
+                     "which implies that RewriteRule directive is forbidden: "
+                     "%s", r->filename);
+        return HTTP_FORBIDDEN;
+    }
+
+    /*
+     *  remember the current filename before rewriting for later check
+     *  to prevent deadlooping because of internal redirects
+     *  on final URL/filename which can be equal to the inital one.
+     *  also, we'll restore original r->filename if we decline this
+     *  request
+     */
+    ofilename = r->filename;
+
+    if (r->filename == NULL) {
+        r->filename = apr_pstrdup(r->pool, r->uri);
+        rewritelog(r, 2, "init rewrite engine with requested uri %s",
+                   r->filename);
+    }
+
+    /*
+     *  now apply the rules ...
+     */
+    rulestatus = apply_rewrite_list(r, dconf->rewriterules, dconf->directory);
+    if (rulestatus) {
+        unsigned skip;
+
+        if (strlen(r->filename) > 6 &&
+            strncmp(r->filename, "proxy:", 6) == 0) {
+            /* it should go on as an internal proxy request */
+
+            /* make sure the QUERY_STRING and
+             * PATH_INFO parts get incorporated
+             * (r->path_info was already appended by the
+             * rewriting engine because of the per-dir context!)
+             */
+            if (r->args != NULL) {
+                r->filename = apr_pstrcat(r->pool, r->filename,
+                                          "?", r->args, NULL);
+            }
+
+            /* now make sure the request gets handled by the proxy handler */
+            if (PROXYREQ_NONE == r->proxyreq) {
+                r->proxyreq = PROXYREQ_REVERSE;
+            }
+            r->handler  = "proxy-server";
+
+            rewritelog(r, 1, "[per-dir %s] go-ahead with proxy request "
+                       "%s [OK]", dconf->directory, r->filename);
+            return OK;
+        }
+        else if ((skip = is_absolute_uri(r->filename)) > 0) {
+            /* it was finally rewritten to a remote URL */
+
+            /* because we are in a per-dir context
+             * first try to replace the directory with its base-URL
+             * if there is a base-URL available
+             */
+            if (dconf->baseurl != NULL) {
+                /* skip 'scheme://' */
+                cp = r->filename + skip;
+
+                if ((cp = ap_strchr(cp, '/')) != NULL && *(++cp)) {
+                    rewritelog(r, 2,
+                               "[per-dir %s] trying to replace "
+                               "prefix %s with %s",
+                               dconf->directory, dconf->directory,
+                               dconf->baseurl);
+
+                    /* I think, that hack needs an explanation:
+                     * well, here is it:
+                     * mod_rewrite was written for unix systems, were
+                     * absolute file-system paths start with a slash.
+                     * URL-paths _also_ start with slashes, so they
+                     * can be easily compared with system paths.
+                     *
+                     * the following assumes, that the actual url-path
+                     * may be prefixed by the current directory path and
+                     * tries to replace the system path with the RewriteBase
+                     * URL.
+                     * That assumption is true if we use a RewriteRule like
+                     *
+                     * RewriteRule ^foo bar [R]
+                     *
+                     * (see apply_rewrite_rule function)
+                     * However on systems that don't have a / as system
+                     * root this will never match, so we skip the / after the
+                     * hostname and compare/substitute only the stuff after it.
+                     *
+                     * (note that cp was already increased to the right value)
+                     */
+                    cp2 = subst_prefix_path(r, cp, (*dconf->directory == '/')
+                                                   ? dconf->directory + 1
+                                                   : dconf->directory,
+                                            dconf->baseurl + 1);
+                    if (strcmp(cp2, cp) != 0) {
+                        *cp = '\0';
+                        r->filename = apr_pstrcat(r->pool, r->filename,
+                                                  cp2, NULL);
+                    }
+                }
+            }
+
+            /* now prepare the redirect... */
+            if (rulestatus != ACTION_NOESCAPE) {
+                rewritelog(r, 1, "[per-dir %s] escaping %s for redirect",
+                           dconf->directory, r->filename);
+                r->filename = escape_absolute_uri(r->pool, r->filename, skip);
+            }
+
+            /* append the QUERY_STRING part */
+            if (r->args) {
+                r->filename = apr_pstrcat(r->pool, r->filename, "?",
+                                          (rulestatus == ACTION_NOESCAPE)
+                                            ? r->args
+                                            : ap_escape_uri(r->pool, r->args),
+                                          NULL);
+            }
+
+            /* determine HTTP redirect response code */
+            if (ap_is_HTTP_REDIRECT(r->status)) {
+                n = r->status;
+                r->status = HTTP_OK; /* make Apache kernel happy */
+            }
+            else {
+                n = HTTP_MOVED_TEMPORARILY;
+            }
+
+            /* now do the redirection */
+            apr_table_setn(r->headers_out, "Location", r->filename);
+            rewritelog(r, 1, "[per-dir %s] redirect to %s [REDIRECT/%d]",
+                       dconf->directory, r->filename, n);
+            return n;
+        }
+        else if (strlen(r->filename) > 10 &&
+                 strncmp(r->filename, "forbidden:", 10) == 0) {
+            /* This URL is forced to be forbidden for the requester */
+            return HTTP_FORBIDDEN;
+        }
+        else if (strlen(r->filename) > 5 &&
+                 strncmp(r->filename, "gone:", 5) == 0) {
+            /* This URL is forced to be gone */
+            return HTTP_GONE;
+        }
+        else {
+            /* it was finally rewritten to a local path */
+
+            /* if someone used the PASSTHROUGH flag in per-dir
+             * context we just ignore it. It is only useful
+             * in per-server context
+             */
+            if (strlen(r->filename) > 12 &&
+                strncmp(r->filename, "passthrough:", 12) == 0) {
+                r->filename = apr_pstrdup(r->pool, r->filename+12);
+            }
+
+            /* the filename must be either an absolute local path or an
+             * absolute local URL.
+             */
+            if (   *r->filename != '/'
+                && !ap_os_is_path_absolute(r->pool, r->filename)) {
+                return HTTP_BAD_REQUEST;
+            }
+
+            /* Check for deadlooping:
+             * At this point we KNOW that at least one rewriting
+             * rule was applied, but when the resulting URL is
+             * the same as the initial URL, we are not allowed to
+             * use the following internal redirection stuff because
+             * this would lead to a deadloop.
+             */
+            if (ofilename != NULL && strcmp(r->filename, ofilename) == 0) {
+                rewritelog(r, 1, "[per-dir %s] initial URL equal rewritten "
+                           "URL: %s [IGNORING REWRITE]",
+                           dconf->directory, r->filename);
+                return OK;
+            }
+
+            /* if there is a valid base-URL then substitute
+             * the per-dir prefix with this base-URL if the
+             * current filename still is inside this per-dir
+             * context. If not then treat the result as a
+             * plain URL
+             */
+            if (dconf->baseurl != NULL) {
+                rewritelog(r, 2,
+                           "[per-dir %s] trying to replace prefix %s with %s",
+                           dconf->directory, dconf->directory, dconf->baseurl);
+                r->filename = subst_prefix_path(r, r->filename,
+                                                dconf->directory,
+                                                dconf->baseurl);
+            }
+            else {
+                /* if no explicit base-URL exists we assume
+                 * that the directory prefix is also a valid URL
+                 * for this webserver and only try to remove the
+                 * document_root if it is prefix
+                 */
+                if ((ccp = ap_document_root(r)) != NULL) {
+                    prefix = apr_pstrdup(r->pool, ccp);
+                    /* always NOT have a trailing slash */
+                    l = strlen(prefix);
+                    if (prefix[l-1] == '/') {
+                        prefix[l-1] = '\0';
+                        l--;
+                    }
+                    if (strncmp(r->filename, prefix, l) == 0) {
+                        rewritelog(r, 2,
+                                   "[per-dir %s] strip document_root "
+                                   "prefix: %s -> %s",
+                                   dconf->directory, r->filename,
+                                   r->filename+l);
+                        r->filename = apr_pstrdup(r->pool, r->filename+l);
+                    }
+                }
+            }
+
+            /* now initiate the internal redirect */
+            rewritelog(r, 1, "[per-dir %s] internal redirect with %s "
+                       "[INTERNAL REDIRECT]", dconf->directory, r->filename);
+            r->filename = apr_pstrcat(r->pool, "redirect:", r->filename, NULL);
+            r->handler = "redirect-handler";
+            return OK;
+        }
+    }
+    else {
+        rewritelog(r, 1, "[per-dir %s] pass through %s",
+                   dconf->directory, r->filename);
+        r->filename = ofilename;
+        return DECLINED;
+    }
+}
+
+
+/*
+**
+**  Content-Handlers
+**
+**  [used for redirect support]
+**
+*/
+
+static int handler_redirect(request_rec *r)
+{
+    if (strcmp(r->handler, "redirect-handler")) {
+        return DECLINED;
+    }
+
+    /* just make sure that we are really meant! */
+    if (strncmp(r->filename, "redirect:", 9) != 0) {
+        return DECLINED;
+    }
+
+    if (is_redirect_limit_exceeded(r)) {
+        ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
+                      "mod_rewrite: maximum number of internal redirects "
+                      "reached. Assuming configuration error. Use "
+                      "'RewriteOptions MaxRedirects' to increase the limit "
+                      "if neccessary.");
+        return HTTP_INTERNAL_SERVER_ERROR;
+    }
+
+    /* now do the internal redirect */
+    ap_internal_redirect(apr_pstrcat(r->pool, r->filename+9,
+                                     r->args ? "?" : NULL, r->args, NULL), r);
+
+    /* and return gracefully */
+    return OK;
+}
+
+/*
+ * check whether redirect limit is reached
+ */
+static int is_redirect_limit_exceeded(request_rec *r)
+{
+    request_rec *top = r;
+    rewrite_request_conf *reqc;
+    rewrite_perdir_conf *dconf;
+
+    /* we store it in the top request */
+    while (top->main) {
+        top = top->main;
+    }
+    while (top->prev) {
+        top = top->prev;
+    }
+
+    /* fetch our config */
+    reqc = (rewrite_request_conf *) ap_get_module_config(top->request_config,
+                                                         &rewrite_module);
+
+    /* no config there? create one. */
+    if (!reqc) {
+        rewrite_server_conf *sconf;
+
+        reqc = apr_palloc(top->pool, sizeof(rewrite_request_conf));
+        sconf = ap_get_module_config(r->server->module_config, &rewrite_module);
+
+        reqc->redirects = 0;
+        reqc->redirect_limit = sconf->redirect_limit
+                                 ? sconf->redirect_limit
+                                 : REWRITE_REDIRECT_LIMIT;
+
+        /* associate it with this request */
+        ap_set_module_config(top->request_config, &rewrite_module, reqc);
+    }
+
+    /* allow to change the limit during redirects. */
+    dconf = (rewrite_perdir_conf *)ap_get_module_config(r->per_dir_config,
+                                                        &rewrite_module);
+
+    /* 0 == unset; take server conf ... */
+    if (dconf->redirect_limit) {
+        reqc->redirect_limit = dconf->redirect_limit;
+    }
+
+    ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
+                  "mod_rewrite's internal redirect status: %d/%d.",
+                  reqc->redirects, reqc->redirect_limit);
+
+    /* and now give the caller a hint */
+    return (reqc->redirects++ >= reqc->redirect_limit);
+}
+
+
+/*
+** +-------------------------------------------------------+
+** |                                                       |
+** |                  the rewriting engine
+** |                                                       |
+** +-------------------------------------------------------+
+*/
+
+/*
+ *  Apply a complete rule set,
+ *  i.e. a list of rewrite rules
+ */
+static int apply_rewrite_list(request_rec *r, apr_array_header_t *rewriterules,
+                              char *perdir)
+{
+    rewriterule_entry *entries;
+    rewriterule_entry *p;
+    int i;
+    int changed;
+    int rc;
+    int s;
+
+    /*
+     *  Iterate over all existing rules
+     */
+    entries = (rewriterule_entry *)rewriterules->elts;
+    changed = 0;
+    loop:
+    for (i = 0; i < rewriterules->nelts; i++) {
+        p = &entries[i];
+
+        /*
+         *  Ignore this rule on subrequests if we are explicitly
+         *  asked to do so or this is a proxy-throughput or a
+         *  forced redirect rule.
+         */
+        if (r->main != NULL &&
+            (p->flags & RULEFLAG_IGNOREONSUBREQ ||
+             p->flags & RULEFLAG_PROXY          ||
+             p->flags & RULEFLAG_FORCEREDIRECT    )) {
+            continue;
+        }
+
+        /*
+         *  Apply the current rule.
+         */
+        rc = apply_rewrite_rule(r, p, perdir);
+        if (rc) {
+            /*
+             *  Indicate a change if this was not a match-only rule.
+             */
+            if (rc != 2) {
+                changed = ((p->flags & RULEFLAG_NOESCAPE)
+                           ? ACTION_NOESCAPE : ACTION_NORMAL);
+            }
+
+            /*
+             *  Pass-Through Feature (`RewriteRule .. .. [PT]'):
+             *  Because the Apache 1.x API is very limited we
+             *  need this hack to pass the rewritten URL to other
+             *  modules like mod_alias, mod_userdir, etc.
+             */
+            if (p->flags & RULEFLAG_PASSTHROUGH) {
+                rewritelog(r, 2, "forcing '%s' to get passed through "
+                           "to next API URI-to-filename handler", r->filename);
+                r->filename = apr_pstrcat(r->pool, "passthrough:",
+                                         r->filename, NULL);
+                changed = ACTION_NORMAL;
+                break;
+            }
+
+            /*
+             *  Rule has the "forbidden" flag set which means that
+             *  we stop processing and indicate this to the caller.
+             */
+            if (p->flags & RULEFLAG_FORBIDDEN) {
+                rewritelog(r, 2, "forcing '%s' to be forbidden", r->filename);
+                r->filename = apr_pstrcat(r->pool, "forbidden:",
+                                         r->filename, NULL);
+                changed = ACTION_NORMAL;
+                break;
+            }
+
+            /*
+             *  Rule has the "gone" flag set which means that
+             *  we stop processing and indicate this to the caller.
+             */
+            if (p->flags & RULEFLAG_GONE) {
+                rewritelog(r, 2, "forcing '%s' to be gone", r->filename);
+                r->filename = apr_pstrcat(r->pool, "gone:", r->filename, NULL);
+                changed = ACTION_NORMAL;
+                break;
+            }
+
+            /*
+             *  Stop processing also on proxy pass-through and
+             *  last-rule and new-round flags.
+             */
+            if (p->flags & RULEFLAG_PROXY) {
+                break;
+            }
+            if (p->flags & RULEFLAG_LASTRULE) {
+                break;
+            }
+
+            /*
+             *  On "new-round" flag we just start from the top of
+             *  the rewriting ruleset again.
+             */
+            if (p->flags & RULEFLAG_NEWROUND) {
+                goto loop;
+            }
+
+            /*
+             *  If we are forced to skip N next rules, do it now.
+             */
+            if (p->skip > 0) {
+                s = p->skip;
+                while (   i < rewriterules->nelts
+                       && s > 0) {
+                    i++;
+                    p = &entries[i];
+                    s--;
+                }
+            }
+        }
+        else {
+            /*
+             *  If current rule is chained with next rule(s),
+             *  skip all this next rule(s)
+             */
+            while (   i < rewriterules->nelts
+                   && p->flags & RULEFLAG_CHAIN) {
+                i++;
+                p = &entries[i];
+            }
+        }
+    }
+    return changed;
+}
+
+/*
+ *  Apply a single(!) rewrite rule
+ */
+static int apply_rewrite_rule(request_rec *r, rewriterule_entry *p,
+                              char *perdir)
+{
+    char *uri;
+    char *output;
+    const char *vary;
+    char newuri[MAX_STRING_LEN];
+    regex_t *regexp;
+    regmatch_t regmatch[AP_MAX_REG_MATCH];
+    backrefinfo *briRR = NULL;
+    backrefinfo *briRC = NULL;
+    int failed;
+    apr_array_header_t *rewriteconds;
+    rewritecond_entry *conds;
+    rewritecond_entry *c;
+    int i;
+    int rc;
+    int is_proxyreq = 0;
+
+    /*
+     *  Initialisation
+     */
+    uri     = r->filename;
+    regexp  = p->regexp;
+    output  = p->output;
+
+    /*
+     *  Add (perhaps splitted away) PATH_INFO postfix to URL to
+     *  make sure we really match against the complete URL.
+     */
+    if (perdir != NULL && r->path_info != NULL && r->path_info[0] != '\0') {
+        rewritelog(r, 3, "[per-dir %s] add path info postfix: %s -> %s%s",
+                   perdir, uri, uri, r->path_info);
+        uri = apr_pstrcat(r->pool, uri, r->path_info, NULL);
+    }
+
+    /*
+     *  On per-directory context (.htaccess) strip the location
+     *  prefix from the URL to make sure patterns apply only to
+     *  the local part.  Additionally indicate this special
+     *  threatment in the logfile.
+     */
+    if (perdir) {
+        /*
+  	     * Proxy request?
+         */
+  	    is_proxyreq = (   r->proxyreq && r->filename
+  	                   && !strncmp(r->filename, "proxy:", 6));
+
+        if (   !is_proxyreq && strlen(uri) >= strlen(perdir)
+            && strncmp(uri, perdir, strlen(perdir)) == 0) {
+            rewritelog(r, 3, "[per-dir %s] strip per-dir prefix: %s -> %s",
+                       perdir, uri, uri+strlen(perdir));
+            uri = uri+strlen(perdir);
+        }
+    }
+
+    /*
+     *  Try to match the URI against the RewriteRule pattern
+     *  and exit immeddiately if it didn't apply.
+     */
+    if (perdir == NULL) {
+        rewritelog(r, 3, "applying pattern '%s' to uri '%s'",
+                   p->pattern, uri);
+    }
+    else {
+        rewritelog(r, 3, "[per-dir %s] applying pattern '%s' to uri '%s'",
+                   perdir, p->pattern, uri);
+    }
+    rc = (ap_regexec(regexp, uri, AP_MAX_REG_MATCH, regmatch, 0) == 0);
+    if (! (( rc && !(p->flags & RULEFLAG_NOTMATCH)) ||
+           (!rc &&  (p->flags & RULEFLAG_NOTMATCH))   ) ) {
+        return 0;
+    }
+
+    /*
+     *  Else create the RewriteRule `regsubinfo' structure which
+     *  holds the substitution information.
+     */
+    briRR = (backrefinfo *)apr_palloc(r->pool, sizeof(backrefinfo));
+    if (!rc && (p->flags & RULEFLAG_NOTMATCH)) {
+        /*  empty info on negative patterns  */
+        briRR->source = "";
+        briRR->nsub   = 0;
+    }
+    else {
+        briRR->source = apr_pstrdup(r->pool, uri);
+        briRR->nsub   = regexp->re_nsub;
+        memcpy((void *)(briRR->regmatch), (void *)(regmatch),
+               sizeof(regmatch));
+    }
+
+    /*
+     *  Initiallally create the RewriteCond backrefinfo with
+     *  empty backrefinfo, i.e. not subst parts
+     *  (this one is adjusted inside apply_rewrite_cond() later!!)
+     */
+    briRC = (backrefinfo *)apr_pcalloc(r->pool, sizeof(backrefinfo));
+    briRC->source = "";
+    briRC->nsub   = 0;
+
+    /*
+     *  Ok, we already know the pattern has matched, but we now
+     *  additionally have to check for all existing preconditions
+     *  (RewriteCond) which have to be also true. We do this at
+     *  this very late stage to avoid unnessesary checks which
+     *  would slow down the rewriting engine!!
+     */
+    rewriteconds = p->rewriteconds;
+    conds = (rewritecond_entry *)rewriteconds->elts;
+    failed = 0;
+    for (i = 0; i < rewriteconds->nelts; i++) {
+        c = &conds[i];
+        rc = apply_rewrite_cond(r, c, perdir, briRR, briRC);
+        if (c->flags & CONDFLAG_ORNEXT) {
+            /*
+             *  The "OR" case
+             */
+            if (rc == 0) {
+                /*  One condition is false, but another can be
+                 *  still true, so we have to continue...
+                 */
+                apr_table_unset(r->notes, VARY_KEY_THIS);
+                continue;
+            }
+            else {
+                /*  One true condition is enough in "or" case, so
+                 *  skip the other conditions which are "ornext"
+                 *  chained
+                 */
+                while (   i < rewriteconds->nelts
+                       && c->flags & CONDFLAG_ORNEXT) {
+                    i++;
+                    c = &conds[i];
+                }
+                continue;
+            }
+        }
+        else {
+            /*
+             *  The "AND" case, i.e. no "or" flag,
+             *  so a single failure means total failure.
+             */
+            if (rc == 0) {
+                failed = 1;
+                break;
+            }
+        }
+        vary = apr_table_get(r->notes, VARY_KEY_THIS);
+        if (vary != NULL) {
+            apr_table_merge(r->notes, VARY_KEY, vary);
+            apr_table_unset(r->notes, VARY_KEY_THIS);
+        }
+    }
+    /*  if any condition fails the complete rule fails  */
+    if (failed) {
+        apr_table_unset(r->notes, VARY_KEY);
+        apr_table_unset(r->notes, VARY_KEY_THIS);
+        return 0;
+    }
+
+    /*
+     * Regardless of what we do next, we've found a match.  Check to see
+     * if any of the request header fields were involved, and add them
+     * to the Vary field of the response.
+     */
+    if ((vary = apr_table_get(r->notes, VARY_KEY)) != NULL) {
+        apr_table_merge(r->headers_out, "Vary", vary);
+        apr_table_unset(r->notes, VARY_KEY);
+    }
+
+    /*
+     *  If this is a pure matching rule (`RewriteRule <pat> -')
+     *  we stop processing and return immediately. The only thing
+     *  we have not to forget are the environment variables and
+     *  cookies:
+     *  (`RewriteRule <pat> - [E=...,CO=...]')
+     */
+    if (strcmp(output, "-") == 0) {
+        do_expand_env(r, p->env, briRR, briRC);
+        do_expand_cookie(r, p->cookie, briRR, briRC);
+        if (p->forced_mimetype != NULL) {
+            if (perdir == NULL) {
+                /* In the per-server context we can force the MIME-type
+                 * the correct way by notifying our MIME-type hook handler
+                 * to do the job when the MIME-type API stage is reached.
+                 */
+                rewritelog(r, 2, "remember %s to have MIME-type '%s'",
+                           r->filename, p->forced_mimetype);
+                apr_table_setn(r->notes, REWRITE_FORCED_MIMETYPE_NOTEVAR,
+                               p->forced_mimetype);
+            }
+            else {
+                /* In per-directory context we operate in the Fixup API hook
+                 * which is after the MIME-type hook, so our MIME-type handler
+                 * has no chance to set r->content_type. And because we are
+                 * in the situation where no substitution takes place no
+                 * sub-request will happen (which could solve the
+                 * restriction). As a workaround we do it ourself now
+                 * immediately although this is not strictly API-conforming.
+                 * But it's the only chance we have...
+                 */
+                rewritelog(r, 1, "[per-dir %s] force %s to have MIME-type "
+                           "'%s'", perdir, r->filename, p->forced_mimetype);
+                ap_set_content_type(r, p->forced_mimetype);
+            }
+        }
+        return 2;
+    }
+
+    /*
+     *  Ok, now we finally know all patterns have matched and
+     *  that there is something to replace, so we create the
+     *  substitution URL string in `newuri'.
+     */
+    do_expand(r, output, newuri, sizeof(newuri), briRR, briRC);
+    if (perdir == NULL) {
+        rewritelog(r, 2, "rewrite %s -> %s", uri, newuri);
+    }
+    else {
+        rewritelog(r, 2, "[per-dir %s] rewrite %s -> %s", perdir, uri, newuri);
+    }
+
+    /*
+     *  Additionally do expansion for the environment variable
+     *  strings (`RewriteRule .. .. [E=<string>]').
+     */
+    do_expand_env(r, p->env, briRR, briRC);
+
+    /*
+     *  Also set cookies for any cookie strings
+     *  (`RewriteRule .. .. [CO=<string>]').
+     */
+    do_expand_cookie(r, p->cookie, briRR, briRC);
+
+    /*
+     *  Now replace API's knowledge of the current URI:
+     *  Replace r->filename with the new URI string and split out
+     *  an on-the-fly generated QUERY_STRING part into r->args
+     */
+    r->filename = apr_pstrdup(r->pool, newuri);
+    splitout_queryargs(r, p->flags & RULEFLAG_QSAPPEND);
+
+    /*
+     *   Add the previously stripped per-directory location
+     *   prefix if the new URI is not a new one for this
+     *   location, i.e. if it's not an absolute URL (!) path nor
+     *   a fully qualified URL scheme.
+     */
+    if (   perdir && !is_proxyreq && *r->filename != '/'
+        && !is_absolute_uri(r->filename)) {
+        rewritelog(r, 3, "[per-dir %s] add per-dir prefix: %s -> %s%s",
+                   perdir, r->filename, perdir, r->filename);
+        r->filename = apr_pstrcat(r->pool, perdir, r->filename, NULL);
+    }
+
+    /*
+     *  If this rule is forced for proxy throughput
+     *  (`RewriteRule ... ... [P]') then emulate mod_proxy's
+     *  URL-to-filename handler to be sure mod_proxy is triggered
+     *  for this URL later in the Apache API. But make sure it is
+     *  a fully-qualified URL. (If not it is qualified with
+     *  ourself).
+     */
+    if (p->flags & RULEFLAG_PROXY) {
+        fully_qualify_uri(r);
+        if (perdir == NULL) {
+            rewritelog(r, 2, "forcing proxy-throughput with %s", r->filename);
+        }
+        else {
+            rewritelog(r, 2, "[per-dir %s] forcing proxy-throughput with %s",
+                       perdir, r->filename);
+        }
+        r->filename = apr_pstrcat(r->pool, "proxy:", r->filename, NULL);
+        return 1;
+    }
+
+    /*
+     *  If this rule is explicitly forced for HTTP redirection
+     *  (`RewriteRule .. .. [R]') then force an external HTTP
+     *  redirect. But make sure it is a fully-qualified URL. (If
+     *  not it is qualified with ourself).
+     */
+    if (p->flags & RULEFLAG_FORCEREDIRECT) {
+        fully_qualify_uri(r);
+        if (perdir == NULL) {
+            rewritelog(r, 2,
+                       "explicitly forcing redirect with %s", r->filename);
+        }
+        else {
+            rewritelog(r, 2,
+                       "[per-dir %s] explicitly forcing redirect with %s",
+                       perdir, r->filename);
+        }
+        r->status = p->forced_responsecode;
+        return 1;
+    }
+
+    /*
+     *  Special Rewriting Feature: Self-Reduction
+     *  We reduce the URL by stripping a possible
+     *  http[s]://<ourhost>[:<port>] prefix, i.e. a prefix which
+     *  corresponds to ourself. This is to simplify rewrite maps
+     *  and to avoid recursion, etc. When this prefix is not a
+     *  coincidence then the user has to use [R] explicitly (see
+     *  above).
+     */
+    reduce_uri(r);
+
+    /*
+     *  If this rule is still implicitly forced for HTTP
+     *  redirection (`RewriteRule .. <scheme>://...') then
+     *  directly force an external HTTP redirect.
+     */
+    if (is_absolute_uri(r->filename)) {
+        if (perdir == NULL) {
+            rewritelog(r, 2,
+                       "implicitly forcing redirect (rc=%d) with %s",
+                       p->forced_responsecode, r->filename);
+        }
+        else {
+            rewritelog(r, 2, "[per-dir %s] implicitly forcing redirect "
+                       "(rc=%d) with %s", perdir, p->forced_responsecode,
+                       r->filename);
+        }
+        r->status = p->forced_responsecode;
+        return 1;
+    }
+
+    /*
+     *  Finally we had to remember if a MIME-type should be
+     *  forced for this URL (`RewriteRule .. .. [T=<type>]')
+     *  Later in the API processing phase this is forced by our
+     *  MIME API-hook function. This time it's no problem even for
+     *  the per-directory context (where the MIME-type hook was
+     *  already processed) because a sub-request happens ;-)
+     */
+    if (p->forced_mimetype != NULL) {
+        apr_table_setn(r->notes, REWRITE_FORCED_MIMETYPE_NOTEVAR,
+                      p->forced_mimetype);
+        if (perdir == NULL) {
+            rewritelog(r, 2, "remember %s to have MIME-type '%s'",
+                       r->filename, p->forced_mimetype);
+        }
+        else {
+            rewritelog(r, 2,
+                       "[per-dir %s] remember %s to have MIME-type '%s'",
+                       perdir, r->filename, p->forced_mimetype);
+        }
+    }
+
+    /*
+     *  Puuhhhhhhhh... WHAT COMPLICATED STUFF ;_)
+     *  But now we're done for this particular rule.
+     */
+    return 1;
+}
+
+static int apply_rewrite_cond(request_rec *r, rewritecond_entry *p,
+                              char *perdir, backrefinfo *briRR,
+                              backrefinfo *briRC)
+{
+    char input[MAX_STRING_LEN];
+    apr_finfo_t sb;
+    request_rec *rsub;
+    regmatch_t regmatch[AP_MAX_REG_MATCH];
+    int rc;
+
+    /*
+     *   Construct the string we match against
+     */
+
+    do_expand(r, p->input, input, sizeof(input), briRR, briRC);
+
+    /*
+     *   Apply the patterns
+     */
+
+    rc = 0;
+    if (strcmp(p->pattern, "-f") == 0) {
+        if (apr_stat(&sb, input, APR_FINFO_MIN, r->pool) == APR_SUCCESS) {
+            if (sb.filetype == APR_REG) {
+                rc = 1;
+            }
+        }
+    }
+    else if (strcmp(p->pattern, "-s") == 0) {
+        if (apr_stat(&sb, input, APR_FINFO_MIN, r->pool) == APR_SUCCESS) {
+            if ((sb.filetype == APR_REG) && sb.size > 0) {
+                rc = 1;
+            }
+        }
+    }
+    else if (strcmp(p->pattern, "-l") == 0) {
+#if !defined(OS2)
+        if (apr_lstat(&sb, input, APR_FINFO_MIN, r->pool) == APR_SUCCESS) {
+            if (sb.filetype == APR_LNK) {
+                rc = 1;
+            }
+        }
+#endif
+    }
+    else if (strcmp(p->pattern, "-d") == 0) {
+        if (apr_stat(&sb, input, APR_FINFO_MIN, r->pool) == APR_SUCCESS) {
+            if (sb.filetype == APR_DIR) {
+                rc = 1;
+            }
+        }
+    }
+    else if (strcmp(p->pattern, "-U") == 0) {
+        /* avoid infinite subrequest recursion */
+        if (strlen(input) > 0 && subreq_ok(r)) {
+
+            /* run a URI-based subrequest */
+            rsub = ap_sub_req_lookup_uri(input, r, NULL);
+
+            /* URI exists for any result up to 3xx, redirects allowed */
+            if (rsub->status < 400)
+                rc = 1;
+
+            /* log it */
+            rewritelog(r, 5, "RewriteCond URI (-U) check: "
+                       "path=%s -> status=%d", input, rsub->status);
+
+            /* cleanup by destroying the subrequest */
+            ap_destroy_sub_req(rsub);
+        }
+    }
+    else if (strcmp(p->pattern, "-F") == 0) {
+        /* avoid infinite subrequest recursion */
+        if (strlen(input) > 0 && subreq_ok(r)) {
+
+            /* process a file-based subrequest:
+             * this differs from -U in that no path translation is done.
+             */
+            rsub = ap_sub_req_lookup_file(input, r, NULL);
+
+            /* file exists for any result up to 2xx, no redirects */
+            if (rsub->status < 300 &&
+                /* double-check that file exists since default result is 200 */
+                apr_stat(&sb, rsub->filename, APR_FINFO_MIN,
+                         r->pool) == APR_SUCCESS) {
+                rc = 1;
+            }
+
+            /* log it */
+            rewritelog(r, 5, "RewriteCond file (-F) check: path=%s "
+                       "-> file=%s status=%d", input, rsub->filename,
+                       rsub->status);
+
+            /* cleanup by destroying the subrequest */
+            ap_destroy_sub_req(rsub);
+        }
+    }
+    else if (strlen(p->pattern) > 1 && *(p->pattern) == '>') {
+        rc = (compare_lexicography(input, p->pattern+1) == 1 ? 1 : 0);
+    }
+    else if (strlen(p->pattern) > 1 && *(p->pattern) == '<') {
+        rc = (compare_lexicography(input, p->pattern+1) == -1 ? 1 : 0);
+    }
+    else if (strlen(p->pattern) > 1 && *(p->pattern) == '=') {
+        if (strcmp(p->pattern+1, "\"\"") == 0) {
+            rc = (*input == '\0');
+        }
+        else {
+            rc = (strcmp(input, p->pattern+1) == 0 ? 1 : 0);
+        }
+    }
+    else {
+        /* it is really a regexp pattern, so apply it */
+        rc = (ap_regexec(p->regexp, input, AP_MAX_REG_MATCH, regmatch,0) == 0);
+
+        /* if it isn't a negated pattern and really matched
+           we update the passed-through regex subst info structure */
+        if (rc && !(p->flags & CONDFLAG_NOTMATCH)) {
+            briRC->source = apr_pstrdup(r->pool, input);
+            briRC->nsub   = p->regexp->re_nsub;
+            memcpy((void *)(briRC->regmatch), (void *)(regmatch),
+                   sizeof(regmatch));
+        }
+    }
+
+    /* if this is a non-matching regexp, just negate the result */
+    if (p->flags & CONDFLAG_NOTMATCH) {
+        rc = !rc;
+    }
+
+    rewritelog(r, 4, "RewriteCond: input='%s' pattern='%s%s' => %s",
+               input, (p->flags & CONDFLAG_NOTMATCH ? "!" : ""),
+               p->pattern, rc ? "matched" : "not-matched");
+
+    /* end just return the result */
+    return rc;
+}
+
+
+/*
+** +-------------------------------------------------------+
+** |                                                       |
+** |              URL transformation functions
+** |                                                       |
+** +-------------------------------------------------------+
+*/
+
+
+/*
+**
+**  perform all the expansions on the input string
+**  leaving the result in the supplied buffer
+**
+*/
+
+static void do_expand(request_rec *r, char *input, char *buffer, int nbuf,
+                      backrefinfo *briRR, backrefinfo *briRC)
+{
+    char *inp, *outp;
+    apr_size_t span, space;
+
+    /*
+     * for security reasons this expansion must be performed in a
+     * single pass, otherwise an attacker can arrange for the result
+     * of an earlier expansion to include expansion specifiers that
+     * are interpreted by a later expansion, producing results that
+     * were not intended by the administrator.
+     */
+
+    inp = input;
+    outp = buffer;
+    space = nbuf - 1; /* room for '\0' */
+
+    for (;;) {
+        span = strcspn(inp, "\\$%");
+        if (span > space) {
+            span = space;
+        }
+        memcpy(outp, inp, span);
+        inp += span;
+        outp += span;
+        space -= span;
+        if (space == 0 || *inp == '\0') {
+            break;
+        }
+        /* now we have a '\', '$', or '%' */
+        if (inp[0] == '\\') {
+            if (inp[1] != '\0') {
+                inp++;
+                goto skip;
+            }
+        }
+        else if (inp[1] == '{') {
+            char *endp;
+            endp = find_closing_bracket(inp+2, '{', '}');
+            if (endp == NULL) {
+                goto skip;
+            }
+            /*
+            * These lookups may be recursive in a very convoluted
+            * fashion -- see the LA-U and LA-F variable expansion
+            * prefixes -- so we copy lookup keys to a separate buffer
+            * rather than adding zero bytes in order to use them in
+            * place.
+            */
+            if (inp[0] == '$') {
+                /* ${...} map lookup expansion */
+                /*
+                * To make rewrite maps useful the lookup key and
+                * default values must be expanded, so we make
+                * recursive calls to do the work. For security
+                * reasons we must never expand a string that includes
+                * verbatim data from the network. The recursion here
+                * isn't a problem because the result of expansion is
+                * only passed to lookup_map() so it cannot be
+                * re-expanded, only re-looked-up. Another way of
+                * looking at it is that the recursion is entirely
+                * driven by the syntax of the nested curly brackets.
+                */
+                char *map, *key, *dflt, *result;
+                char xkey[MAX_STRING_LEN];
+                char xdflt[MAX_STRING_LEN];
+                key = find_char_in_brackets(inp+2, ':', '{', '}');
+                if (key == NULL) {
+                    goto skip;
+                }
+                map  = apr_pstrndup(r->pool, inp+2, key-inp-2);
+                dflt = find_char_in_brackets(key+1, '|', '{', '}');
+                if (dflt == NULL) {
+                    key  = apr_pstrndup(r->pool, key+1, endp-key-1);
+                    dflt = "";
+                }
+                else {
+                    key  = apr_pstrndup(r->pool, key+1, dflt-key-1);
+                    dflt = apr_pstrndup(r->pool, dflt+1, endp-dflt-1);
+                }
+                do_expand(r, key,  xkey,  sizeof(xkey),  briRR, briRC);
+                result = lookup_map(r, map, xkey);
+                if (result) {
+                    span = apr_cpystrn(outp, result, space) - outp;
+                }
+                else {
+                    do_expand(r, dflt, xdflt, sizeof(xdflt), briRR, briRC);
+                    span = apr_cpystrn(outp, xdflt, space) - outp;
+                }
+            }
+            else if (inp[0] == '%') {
+                /* %{...} variable lookup expansion */
+                char *var;
+                var  = apr_pstrndup(r->pool, inp+2, endp-inp-2);
+                span = apr_cpystrn(outp, lookup_variable(r, var), space) - outp;
+            }
+            else {
+                span = 0;
+            }
+            inp = endp+1;
+            outp += span;
+            space -= span;
+            continue;
+        }
+        else if (apr_isdigit(inp[1])) {
+            int n = inp[1] - '0';
+            backrefinfo *bri = NULL;
+            if (inp[0] == '$') {
+                /* $N RewriteRule regexp backref expansion */
+                bri = briRR;
+            }
+            else if (inp[0] == '%') {
+                /* %N RewriteCond regexp backref expansion */
+                bri = briRC;
+            }
+            /* see ap_pregsub() in src/main/util.c */
+            if (bri && n < AP_MAX_REG_MATCH
+                && bri->regmatch[n].rm_eo > bri->regmatch[n].rm_so) {
+                span = bri->regmatch[n].rm_eo - bri->regmatch[n].rm_so;
+                if (span > space) {
+                    span = space;
+                }
+                memcpy(outp, bri->source + bri->regmatch[n].rm_so, span);
+                outp += span;
+                space -= span;
+            }
+            inp += 2;
+            continue;
+        }
+        skip:
+        *outp++ = *inp++;
+        space--;
+    }
+    *outp++ = '\0';
+}
+
+
+/*
+**
+**  perform all the expansions on the environment variables
+**
+*/
+
+static void do_expand_env(request_rec *r, char *env[],
+                          backrefinfo *briRR, backrefinfo *briRC)
+{
+    int i;
+    char buf[MAX_STRING_LEN];
+
+    for (i = 0; env[i] != NULL; i++) {
+        do_expand(r, env[i], buf, sizeof(buf), briRR, briRC);
+        add_env_variable(r, buf);
+    }
+}
+
+static void do_expand_cookie( request_rec *r, char *cookie[],
+                              backrefinfo *briRR, backrefinfo *briRC)
+{
+    int i;
+    char buf[MAX_STRING_LEN];
+
+    for (i = 0; cookie[i] != NULL; i++) {
+        do_expand(r, cookie[i], buf, sizeof(buf), briRR, briRC);
+        add_cookie(r, buf);
+    }
+}
+
+
+/*
+**
+**  split out a QUERY_STRING part from
+**  the current URI string
+**
+*/
+
+static void splitout_queryargs(request_rec *r, int qsappend)
+{
+    char *q;
+    char *olduri;
+
+    /* don't touch, unless it's an http or mailto URL.
+     * See RFC 1738 and RFC 2368.
+     */
+    if (   is_absolute_uri(r->filename)
+        && strncasecmp(r->filename, "http", 4)
+        && strncasecmp(r->filename, "mailto", 6)) {
+        r->args = NULL; /* forget the query that's still flying around */
+        return;
+    }
+
+    q = strchr(r->filename, '?');
+    if (q != NULL) {
+        olduri = apr_pstrdup(r->pool, r->filename);
+        *q++ = '\0';
+        if (qsappend) {
+            r->args = apr_pstrcat(r->pool, q, "&", r->args, NULL);
+        }
+        else {
+            r->args = apr_pstrdup(r->pool, q);
+        }
+        if (strlen(r->args) == 0) {
+            r->args = NULL;
+            rewritelog(r, 3, "split uri=%s -> uri=%s, args=<none>", olduri,
+                       r->filename);
+        }
+        else {
+            if (r->args[strlen(r->args)-1] == '&') {
+                r->args[strlen(r->args)-1] = '\0';
+            }
+            rewritelog(r, 3, "split uri=%s -> uri=%s, args=%s", olduri,
+                       r->filename, r->args);
+        }
+    }
+
+    return;
+}
+
+
+/*
+**
+**  strip 'http[s]://ourhost/' from URI
+**
+*/
+
+static void reduce_uri(request_rec *r)
+{
+    char *cp;
+    unsigned short port;
+    char *portp;
+    char *hostp;
+    char *url;
+    char c;
+    char host[LONG_STRING_LEN];
+    char buf[MAX_STRING_LEN];
+    char *olduri;
+    apr_size_t l;
+
+    cp = (char *)ap_http_method(r);
+    l  = strlen(cp);
+    if (   strlen(r->filename) > l+3
+        && strncasecmp(r->filename, cp, l) == 0
+        && r->filename[l]   == ':'
+        && r->filename[l+1] == '/'
+        && r->filename[l+2] == '/'             ) {
+        /* there was really a rewrite to a remote path */
+
+        olduri = apr_pstrdup(r->pool, r->filename); /* save for logging */
+
+        /* cut the hostname and port out of the URI */
+        apr_cpystrn(buf, r->filename+(l+3), sizeof(buf));
+        hostp = buf;
+        for (cp = hostp; *cp != '\0' && *cp != '/' && *cp != ':'; cp++)
+            ;
+        if (*cp == ':') {
+            /* set host */
+            *cp++ = '\0';
+            apr_cpystrn(host, hostp, sizeof(host));
+            /* set port */
+            portp = cp;
+            for (; *cp != '\0' && *cp != '/'; cp++)
+                ;
+            c = *cp;
+            *cp = '\0';
+            port = atoi(portp);
+            *cp = c;
+            /* set remaining url */
+            url = cp;
+        }
+        else if (*cp == '/') {
+            /* set host */
+            *cp = '\0';
+            apr_cpystrn(host, hostp, sizeof(host));
+            *cp = '/';
+            /* set port */
+            port = ap_default_port(r);
+            /* set remaining url */
+            url = cp;
+        }
+        else {
+            /* set host */
+            apr_cpystrn(host, hostp, sizeof(host));
+            /* set port */
+            port = ap_default_port(r);
+            /* set remaining url */
+            url = "/";
+        }
+
+        /* now check whether we could reduce it to a local path... */
+        if (ap_matches_request_vhost(r, host, port)) {
+            /* this is our host, so only the URL remains */
+            r->filename = apr_pstrdup(r->pool, url);
+            rewritelog(r, 3, "reduce %s -> %s", olduri, r->filename);
+        }
+    }
+    return;
+}
+
+
+/*
+**
+**  add 'http[s]://ourhost[:ourport]/' to URI
+**  if URI is still not fully qualified
+**
+*/
+
+static void fully_qualify_uri(request_rec *r)
+{
+    char buf[32];
+    const char *thisserver;
+    char *thisport;
+    int port;
+
+    if (!is_absolute_uri(r->filename)) {
+
+        thisserver = ap_get_server_name(r);
+        port = ap_get_server_port(r);
+        if (ap_is_default_port(port,r)) {
+            thisport = "";
+        }
+        else {
+            apr_snprintf(buf, sizeof(buf), ":%u", port);
+            thisport = buf;
+        }
+
+        if (r->filename[0] == '/') {
+            r->filename = apr_psprintf(r->pool, "%s://%s%s%s",
+                                       ap_http_method(r), thisserver,
+                                       thisport, r->filename);
+        }
+        else {
+            r->filename = apr_psprintf(r->pool, "%s://%s%s/%s",
+                                       ap_http_method(r), thisserver,
+                                       thisport, r->filename);
+        }
+    }
+    return;
+}
+
+
+/* return number of chars of the scheme (incl. '://')
+ * if the URI is absolute (includes a scheme etc.)
+ * otherwise 0.
+ *
+ * NOTE: If you add new schemes here, please have a
+ *       look at escape_absolute_uri and splitout_queryargs.
+ *       Not every scheme takes query strings and some schemes
+ *       may be handled in a special way.
+ *
+ * XXX: we should consider a scheme registry, perhaps with
+ *      appropriate escape callbacks to allow other modules
+ *      to extend mod_rewrite at runtime.
+ */
+static unsigned is_absolute_uri(char *uri)
+{
+    /* fast exit */
+    if (*uri == '/' || strlen(uri) <= 5) {
+        return 0;
+    }
+
+    switch (*uri++) {
+    case 'f':
+    case 'F':
+        if (!strncasecmp(uri, "tp://", 5)) {        /* ftp://    */
+            return 6;
+        }
+        break;
+
+    case 'g':
+    case 'G':
+        if (!strncasecmp(uri, "opher://", 8)) {     /* gopher:// */
+            return 9;
+        }
+        break;
+
+    case 'h':
+    case 'H':
+        if (!strncasecmp(uri, "ttp://", 6)) {       /* http://   */
+            return 7;
+        }
+        else if (!strncasecmp(uri, "ttps://", 7)) { /* https://  */
+            return 8;
+        }
+        break;
+
+    case 'l':
+    case 'L':
+        if (!strncasecmp(uri, "dap://", 6)) {       /* ldap://   */
+            return 7;
+        }
+        break;
+
+    case 'm':
+    case 'M':
+        if (!strncasecmp(uri, "ailto:", 6)) {       /* mailto:   */
+            return 7;
+        }
+        break;
+
+    case 'n':
+    case 'N':
+        if (!strncasecmp(uri, "ews:", 4)) {         /* news:     */
+            return 5;
+        }
+        else if (!strncasecmp(uri, "ntp://", 6)) {  /* nntp://   */
+            return 7;
+        }
+        break;
+    }
+
+    return 0;
+}
+
+
+/* escape absolute uri, which may or may not be path oriented.
+ * So let's handle them differently.
+ */
+static char *escape_absolute_uri(apr_pool_t *p, char *uri, unsigned scheme)
+{
+    char *cp;
+
+    /* be safe.
+     * NULL should indicate elsewhere, that something's wrong
+     */
+    if (!scheme || strlen(uri) < scheme) {
+        return NULL;
+    }
+
+    cp = uri + scheme;
+
+    /* scheme with authority part? */
+    if (cp[-1] == '/') {
+        /* skip host part */
+        while (*cp && *cp != '/') {
+            ++cp;
+        }
+
+        /* nothing after the hostpart. ready! */
+        if (!*cp || !*++cp) {
+            return apr_pstrdup(p, uri);
+        }
+
+        /* remember the hostname stuff */
+        scheme = cp - uri;
+
+        /* special thing for ldap.
+         * The parts are separated by question marks. From RFC 2255:
+         *     ldapurl = scheme "://" [hostport] ["/"
+         *               [dn ["?" [attributes] ["?" [scope]
+         *               ["?" [filter] ["?" extensions]]]]]]
+         */
+        if (!strncasecmp(uri, "ldap", 4)) {
+            char *token[5];
+            int c = 0;
+
+            token[0] = cp = apr_pstrdup(p, cp);
+            while (*cp && c < 4) {
+                if (*cp == '?') {
+                    token[++c] = cp + 1;
+                    *cp = '\0';
+                }
+                ++cp;
+            }
+
+            return apr_pstrcat(p, apr_pstrndup(p, uri, scheme),
+                                          ap_escape_uri(p, token[0]),
+                               (c >= 1) ? "?" : NULL,
+                               (c >= 1) ? ap_escape_uri(p, token[1]) : NULL,
+                               (c >= 2) ? "?" : NULL,
+                               (c >= 2) ? ap_escape_uri(p, token[2]) : NULL,
+                               (c >= 3) ? "?" : NULL,
+                               (c >= 3) ? ap_escape_uri(p, token[3]) : NULL,
+                               (c >= 4) ? "?" : NULL,
+                               (c >= 4) ? ap_escape_uri(p, token[4]) : NULL,
+                               NULL);
+        }
+    }
+
+    /* Nothing special here. Apply normal escaping. */
+    return apr_pstrcat(p, apr_pstrndup(p, uri, scheme),
+                       ap_escape_uri(p, cp), NULL);
+}
+
+
+/*
+**
+**  Expand tilde-paths (/~user) through Unix /etc/passwd
+**  database information (or other OS-specific database)
+**
+*/
+#if APR_HAS_USER
+static char *expand_tildepaths(request_rec *r, char *uri)
+{
+    char user[LONG_STRING_LEN];
+    char *newuri;
+    int i, j;
+    char *homedir;
+
+    newuri = uri;
+    if (uri != NULL && strlen(uri) > 2 && uri[0] == '/' && uri[1] == '~') {
+        /* cut out the username */
+        for (j = 0, i = 2; j < sizeof(user)-1
+               && uri[i] != '\0'
+               && uri[i] != '/'  ; ) {
+            user[j++] = uri[i++];
+        }
+        user[j] = '\0';
+
+        /* lookup username in systems passwd file */
+        if (apr_get_home_directory(&homedir, user, r->pool) == APR_SUCCESS) {
+            /* ok, user was found, so expand the ~user string */
+            if (uri[i] != '\0') {
+                /* ~user/anything...  has to be expanded */
+                if (homedir[strlen(homedir)-1] == '/') {
+                    homedir[strlen(homedir)-1] = '\0';
+                }
+                newuri = apr_pstrcat(r->pool, homedir, uri+i, NULL);
+            }
+            else {
+                /* only ~user has to be expanded */
+                newuri = homedir;
+            }
+        }
+    }
+    return newuri;
+}
+#endif  /* if APR_HAS_USER */
+
+
+
+/*
+** +-------------------------------------------------------+
+** |                                                       |
+** |              DBM hashfile support
+** |                                                       |
+** +-------------------------------------------------------+
+*/
+
+
+static char *lookup_map(request_rec *r, char *name, char *key)
+{
+    rewrite_server_conf *conf;
+    apr_array_header_t *rewritemaps;
+    rewritemap_entry *entries;
+    rewritemap_entry *s;
+    char *value;
+    apr_finfo_t st;
+    apr_status_t rv;
+    int i;
+
+    /* get map configuration */
+    conf = ap_get_module_config(r->server->module_config, &rewrite_module);
+    rewritemaps = conf->rewritemaps;
+
+    entries = (rewritemap_entry *)rewritemaps->elts;
+    for (i = 0; i < rewritemaps->nelts; i++) {
+        s = &entries[i];
+        if (strcmp(s->name, name) == 0) {
+            if (s->type == MAPTYPE_TXT) {
+                if ((rv = apr_stat(&st, s->checkfile,
+                                   APR_FINFO_MIN, r->pool)) != APR_SUCCESS) {
+                    ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r,
+                                  "mod_rewrite: can't access text RewriteMap "
+                                  "file %s", s->checkfile);
+                    rewritelog(r, 1, "can't open RewriteMap file, "
+                               "see error log");
+                    return NULL;
+                }
+                value = get_cache_string(cachep, s->cachename, CACHEMODE_TS,
+                                         st.mtime, key);
+                if (value == NULL) {
+                    rewritelog(r, 6, "cache lookup FAILED, forcing new "
+                               "map lookup");
+                    if ((value =
+                         lookup_map_txtfile(r, s->datafile, key)) != NULL) {
+                        rewritelog(r, 5, "map lookup OK: map=%s key=%s[txt] "
+                                   "-> val=%s", s->name, key, value);
+                        set_cache_string(cachep, s->cachename, CACHEMODE_TS,
+                                         st.mtime, key, value);
+                        return value;
+                    }
+                    else {
+                        rewritelog(r, 5, "map lookup FAILED: map=%s[txt] "
+                                   "key=%s", s->name, key);
+                        set_cache_string(cachep, s->cachename, CACHEMODE_TS,
+                                         st.mtime, key, "");
+                        return NULL;
+                    }
+                }
+                else {
+                    rewritelog(r, 5, "cache lookup OK: map=%s[txt] key=%s "
+                               "-> val=%s", s->name, key, value);
+                    return value[0] != '\0' ? value : NULL;
+                }
+            }
+            else if (s->type == MAPTYPE_DBM) {
+                if ((rv = apr_stat(&st, s->checkfile,
+                                   APR_FINFO_MIN, r->pool)) != APR_SUCCESS) {
+                    ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r,
+                                  "mod_rewrite: can't access DBM RewriteMap "
+                                  "file %s", s->checkfile);
+                    rewritelog(r, 1, "can't open DBM RewriteMap file, "
+                               "see error log");
+                    return NULL;
+                }
+                value = get_cache_string(cachep, s->cachename, CACHEMODE_TS,
+                                         st.mtime, key);
+                if (value == NULL) {
+                    rewritelog(r, 6,
+                               "cache lookup FAILED, forcing new map lookup");
+                    if ((value =
+                         lookup_map_dbmfile(r, s->datafile, s->dbmtype, key)) != NULL) {
+                        rewritelog(r, 5, "map lookup OK: map=%s[dbm] key=%s "
+                                   "-> val=%s", s->name, key, value);
+                        set_cache_string(cachep, s->cachename, CACHEMODE_TS,
+                                         st.mtime, key, value);
+                        return value;
+                    }
+                    else {
+                        rewritelog(r, 5, "map lookup FAILED: map=%s[dbm] "
+                                   "key=%s", s->name, key);
+                        set_cache_string(cachep, s->cachename, CACHEMODE_TS,
+                                         st.mtime, key, "");
+                        return NULL;
+                    }
+                }
+                else {
+                    rewritelog(r, 5, "cache lookup OK: map=%s[dbm] key=%s "
+                               "-> val=%s", s->name, key, value);
+                    return value[0] != '\0' ? value : NULL;
+                }
+            }
+            else if (s->type == MAPTYPE_PRG) {
+                if ((value =
+                     lookup_map_program(r, s->fpin, s->fpout, key)) != NULL) {
+                    rewritelog(r, 5, "map lookup OK: map=%s key=%s -> val=%s",
+                               s->name, key, value);
+                    return value;
+                }
+                else {
+                    rewritelog(r, 5, "map lookup FAILED: map=%s key=%s",
+                               s->name, key);
+                }
+            }
+            else if (s->type == MAPTYPE_INT) {
+                if ((value = s->func(r, key)) != NULL) {
+                    rewritelog(r, 5, "map lookup OK: map=%s key=%s -> val=%s",
+                               s->name, key, value);
+                    return value;
+                }
+                else {
+                    rewritelog(r, 5, "map lookup FAILED: map=%s key=%s",
+                               s->name, key);
+                }
+            }
+            else if (s->type == MAPTYPE_RND) {
+                if ((rv = apr_stat(&st, s->checkfile,
+                                   APR_FINFO_MIN, r->pool)) != APR_SUCCESS) {
+                    ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r,
+                                  "mod_rewrite: can't access text RewriteMap "
+                                  "file %s", s->checkfile);
+                    rewritelog(r, 1, "can't open RewriteMap file, "
+                               "see error log");
+                    return NULL;
+                }
+                value = get_cache_string(cachep, s->cachename, CACHEMODE_TS,
+                                         st.mtime, key);
+                if (value == NULL) {
+                    rewritelog(r, 6, "cache lookup FAILED, forcing new "
+                               "map lookup");
+                    if ((value =
+                         lookup_map_txtfile(r, s->datafile, key)) != NULL) {
+                        rewritelog(r, 5, "map lookup OK: map=%s key=%s[txt] "
+                                   "-> val=%s", s->name, key, value);
+                        set_cache_string(cachep, s->cachename, CACHEMODE_TS,
+                                         st.mtime, key, value);
+                    }
+                    else {
+                        rewritelog(r, 5, "map lookup FAILED: map=%s[txt] "
+                                   "key=%s", s->name, key);
+                        set_cache_string(cachep, s->cachename, CACHEMODE_TS,
+                                         st.mtime, key, "");
+                        return NULL;
+                    }
+                }
+                else {
+                    rewritelog(r, 5, "cache lookup OK: map=%s[txt] key=%s "
+                               "-> val=%s", s->name, key, value);
+                }
+                if (value[0] != '\0') {
+                   value = select_random_value_part(r, value);
+                   rewritelog(r, 5, "randomly choosen the subvalue `%s'",
+                              value);
+                }
+                else {
+                    value = NULL;
+                }
+                return value;
+            }
+        }
+    }
+    return NULL;
+}
+
+static char *lookup_map_txtfile(request_rec *r, const char *file, char *key)
+{
+    apr_file_t *fp = NULL;
+    apr_status_t rc;
+    char line[1024];
+    char *value = NULL;
+    char *cpT;
+    apr_size_t skip;
+    char *curkey;
+    char *curval;
+
+    rc = apr_file_open(&fp, file, APR_READ|APR_BUFFERED, APR_OS_DEFAULT, r->pool);
+    if (rc != APR_SUCCESS) {
+       return NULL;
+    }
+
+    while (apr_file_gets(line, sizeof(line), fp) == APR_SUCCESS) {
+        if (line[0] == '#') {
+            continue; /* ignore comments */
+        }
+        cpT = line;
+        curkey = cpT;
+        skip = strcspn(cpT," \t\r\n");
+        if (skip == 0) {
+            continue; /* ignore lines that start with a space, tab, CR, or LF */
+        }
+        cpT += skip;
+        *cpT = '\0';
+        if (strcmp(curkey, key) != 0) {
+            continue; /* key does not match... */
+        }
+
+        /* found a matching key; now extract and return the value */
+        ++cpT;
+        skip = strspn(cpT, " \t\r\n");
+        cpT += skip;
+        curval = cpT;
+        skip = strcspn(cpT, " \t\r\n");
+        if (skip == 0) {
+            continue; /* no value... */
+        }
+        cpT += skip;
+        *cpT = '\0';
+        value = apr_pstrdup(r->pool, curval);
+        break;
+    }
+    apr_file_close(fp);
+    return value;
+}
+
+static char *lookup_map_dbmfile(request_rec *r, const char *file,
+                                const char *dbmtype, char *key)
+{
+    apr_dbm_t *dbmfp = NULL;
+    apr_datum_t dbmkey;
+    apr_datum_t dbmval;
+    char *value;
+
+    if (apr_dbm_open_ex(&dbmfp, dbmtype, file, APR_DBM_READONLY, APR_OS_DEFAULT, 
+                        r->pool) != APR_SUCCESS) {
+        return NULL;
+    }
+
+    dbmkey.dptr  = key;
+    dbmkey.dsize = strlen(key);
+
+    if (apr_dbm_fetch(dbmfp, dbmkey, &dbmval) == APR_SUCCESS && dbmval.dptr) {
+        value = apr_pstrmemdup(r->pool, dbmval.dptr, dbmval.dsize);
+    }
+    else {
+        value = NULL;
+    }
+
+    apr_dbm_close(dbmfp);
+
+    return value;
+}
+
+static char *lookup_map_program(request_rec *r, apr_file_t *fpin,
+                                apr_file_t *fpout, char *key)
+{
+    char buf[LONG_STRING_LEN];
+    char c;
+    int i;
+    apr_size_t nbytes;
+    apr_status_t rv;
+
+#ifndef NO_WRITEV
+    struct iovec iova[2];
+    apr_size_t niov;
+#endif
+
+    /* when `RewriteEngine off' was used in the per-server
+     * context then the rewritemap-programs were not spawned.
+     * In this case using such a map (usually in per-dir context)
+     * is useless because it is not available.
+     *
+     * newlines in the key leave bytes in the pipe and cause
+     * bad things to happen (next map lookup will use the chars
+     * after the \n instead of the new key etc etc - in other words,
+     * the Rewritemap falls out of sync with the requests).
+     */
+    if (fpin == NULL || fpout == NULL || ap_strchr(key, '\n')) {
+        return NULL;
+    }
+ 
+    /* take the lock */
+
+    if (rewrite_mapr_lock_acquire) {
+        rv = apr_global_mutex_lock(rewrite_mapr_lock_acquire);
+        if (rv != APR_SUCCESS) {
+            ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r,
+                          "apr_global_mutex_lock(rewrite_mapr_lock_acquire) "
+                          "failed");
+            return NULL; /* Maybe this should be fatal? */
+        }
+    }
+
+    /* write out the request key */
+#ifdef NO_WRITEV
+    nbytes = strlen(key);
+    apr_file_write(fpin, key, &nbytes);
+    nbytes = 1;
+    apr_file_write(fpin, "\n", &nbytes);
+#else
+    iova[0].iov_base = key;
+    iova[0].iov_len = strlen(key);
+    iova[1].iov_base = "\n";
+    iova[1].iov_len = 1;
+
+    niov = 2;
+    apr_file_writev(fpin, iova, niov, &nbytes);
+#endif
+
+    /* read in the response value */
+    i = 0;
+    nbytes = 1;
+    apr_file_read(fpout, &c, &nbytes);
+    while (nbytes == 1 && (i < LONG_STRING_LEN-1)) {
+        if (c == '\n') {
+            break;
+        }
+        buf[i++] = c;
+
+        apr_file_read(fpout, &c, &nbytes);
+    }
+    buf[i] = '\0';
+
+    /* give the lock back */
+    if (rewrite_mapr_lock_acquire) {
+        rv = apr_global_mutex_unlock(rewrite_mapr_lock_acquire);
+        if (rv != APR_SUCCESS) {
+            ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r,
+                          "apr_global_mutex_unlock(rewrite_mapr_lock_acquire) "
+                          "failed");
+            return NULL; /* Maybe this should be fatal? */
+        }
+    }
+
+    if (strcasecmp(buf, "NULL") == 0) {
+        return NULL;
+    }
+    else {
+        return apr_pstrdup(r->pool, buf);
+    }
+}
+
+static void ap_register_rewrite_mapfunc(char *name, rewrite_mapfunc_t *func)
+{
+    apr_hash_set(mapfunc_hash, name, strlen(name), (const void *)func);
+}
+
+static char *rewrite_mapfunc_toupper(request_rec *r, char *key)
+{
+    char *value, *cp;
+
+    for (cp = value = apr_pstrdup(r->pool, key); cp != NULL && *cp != '\0';
+         cp++) {
+        *cp = apr_toupper(*cp);
+    }
+    return value;
+}
+
+static char *rewrite_mapfunc_tolower(request_rec *r, char *key)
+{
+    char *value, *cp;
+
+    for (cp = value = apr_pstrdup(r->pool, key); cp != NULL && *cp != '\0';
+         cp++) {
+        *cp = apr_tolower(*cp);
+    }
+    return value;
+}
+
+static char *rewrite_mapfunc_escape(request_rec *r, char *key)
+{
+    char *value;
+
+    value = ap_escape_uri(r->pool, key);
+    return value;
+}
+
+static char *rewrite_mapfunc_unescape(request_rec *r, char *key)
+{
+    char *value;
+
+    value = apr_pstrdup(r->pool, key);
+    ap_unescape_url(value);
+    return value;
+}
+
+static int rewrite_rand_init_done = 0;
+
+static void rewrite_rand_init(void)
+{
+    if (!rewrite_rand_init_done) {
+        srand((unsigned)(getpid()));
+        rewrite_rand_init_done = 1;
+    }
+    return;
+}
+
+static int rewrite_rand(int l, int h)
+{
+    rewrite_rand_init();
+
+    /* Get [0,1) and then scale to the appropriate range. Note that using
+     * a floating point value ensures that we use all bits of the rand()
+     * result. Doing an integer modulus would only use the lower-order bits
+     * which may not be as uniformly random.
+     */
+    return (int)(((double)(rand() % RAND_MAX) / RAND_MAX) * (h - l + 1) + l);
+}
+
+static char *select_random_value_part(request_rec *r, char *value)
+{
+    char *buf;
+    int n, i, k;
+
+    /*  count number of distinct values  */
+    for (n = 1, i = 0; value[i] != '\0'; i++) {
+        if (value[i] == '|') {
+            n++;
+        }
+    }
+
+    /*  when only one value we have no option to choose  */
+    if (n == 1) {
+        return value;
+    }
+
+    /*  else randomly select one  */
+    k = rewrite_rand(1, n);
+
+    /*  and grep it out  */
+    for (n = 1, i = 0; value[i] != '\0'; i++) {
+        if (n == k) {
+            break;
+        }
+        if (value[i] == '|') {
+            n++;
+        }
+    }
+    buf = apr_pstrdup(r->pool, &value[i]);
+    for (i = 0; buf[i] != '\0' && buf[i] != '|'; i++)
+        ;
+    buf[i] = '\0';
+    return buf;
+}
+
+
+/*
+** +-------------------------------------------------------+
+** |                                                       |
+** |              rewriting logfile support
+** |                                                       |
+** +-------------------------------------------------------+
+*/
+
+
+static int open_rewritelog(server_rec *s, apr_pool_t *p)
+{
+    rewrite_server_conf *conf;
+    const char *fname;
+    apr_status_t rc;
+    piped_log *pl;
+    int rewritelog_flags = ( APR_WRITE | APR_APPEND | APR_CREATE );
+    apr_fileperms_t rewritelog_mode = ( APR_UREAD | APR_UWRITE |
+                                        APR_GREAD | APR_WREAD );
+
+    conf = ap_get_module_config(s->module_config, &rewrite_module);
+
+    /* - no logfile configured
+     * - logfilename empty
+     * - virtual log shared w/ main server
+     */
+    if (!conf->rewritelogfile || !*conf->rewritelogfile || conf->rewritelogfp) {
+        return 1;
+    }
+
+    if (*conf->rewritelogfile == '|') {
+        if ((pl = ap_open_piped_log(p, conf->rewritelogfile+1)) == NULL) {
+            ap_log_error(APLOG_MARK, APLOG_ERR, 0, s,
+                         "mod_rewrite: could not open reliable pipe "
+                         "to RewriteLog filter %s", conf->rewritelogfile+1);
+            return 0;
+        }
+        conf->rewritelogfp = ap_piped_log_write_fd(pl);
+    }
+    else if (*conf->rewritelogfile != '\0') {
+        fname = ap_server_root_relative(p, conf->rewritelogfile);
+        if (!fname) {
+            ap_log_error(APLOG_MARK, APLOG_ERR, APR_EBADPATH, s,
+                         "mod_rewrite: Invalid RewriteLog "
+                         "path %s", conf->rewritelogfile);
+            return 0;
+        }
+        if ((rc = apr_file_open(&conf->rewritelogfp, fname,
+                                rewritelog_flags, rewritelog_mode, p))
+                != APR_SUCCESS) {
+            ap_log_error(APLOG_MARK, APLOG_ERR, rc, s,
+                         "mod_rewrite: could not open RewriteLog "
+                         "file %s", fname);
+            return 0;
+        }
+    }
+
+    return 1;
+}
+
+static void rewritelog(request_rec *r, int level, const char *text, ...)
+{
+    rewrite_server_conf *conf;
+    conn_rec *conn;
+    char *str1;
+    char str2[512];
+    char str3[1024];
+    const char *type;
+    char redir[20]; /* enough for "/redir#%d" if int is 32 bit */
+    va_list ap;
+    int i;
+    apr_size_t nbytes;
+    request_rec *req;
+    char *ruser;
+    const char *rhost;
+    apr_status_t rv;
+
+    va_start(ap, text);
+    conf = ap_get_module_config(r->server->module_config, &rewrite_module);
+    conn = r->connection;
+
+    if (conf->rewritelogfp == NULL) {
+        return;
+    }
+    if (conf->rewritelogfile == NULL) {
+        return;
+    }
+    if (*(conf->rewritelogfile) == '\0') {
+        return;
+    }
+
+    if (level > conf->rewriteloglevel) {
+        return;
+    }
+
+    if (r->user == NULL) {
+        ruser = "-";
+    }
+    else if (strlen(r->user) != 0) {
+        ruser = r->user;
+    }
+    else {
+        ruser = "\"\"";
+    }
+
+    rhost = ap_get_remote_host(conn, r->per_dir_config,
+                               REMOTE_NOLOOKUP, NULL);
+    if (rhost == NULL) {
+        rhost = "UNKNOWN-HOST";
+    }
+
+    str1 = apr_pstrcat(r->pool, rhost, " ",
+                      (conn->remote_logname != NULL ?
+                      conn->remote_logname : "-"), " ",
+                      ruser, NULL);
+    apr_vsnprintf(str2, sizeof(str2), text, ap);
+
+    if (r->main == NULL) {
+        type = "initial";
+    }
+    else {
+        type = "subreq";
+    }
+
+    for (i = 0, req = r; req->prev != NULL; req = req->prev) {
+        i++;
+    }
+    if (i == 0) {
+        redir[0] = '\0';
+    }
+    else {
+        apr_snprintf(redir, sizeof(redir), "/redir#%d", i);
+    }
+
+    apr_snprintf(str3, sizeof(str3),
+                "%s %s [%s/sid#%lx][rid#%lx/%s%s] (%d) %s" APR_EOL_STR, str1,
+                current_logtime(r), ap_get_server_name(r),
+                (unsigned long)(r->server), (unsigned long)r,
+                type, redir, level, str2);
+
+    rv = apr_global_mutex_lock(rewrite_log_lock);
+    if (rv != APR_SUCCESS) {
+        ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r,
+                      "apr_global_mutex_lock(rewrite_log_lock) failed");
+        /* XXX: Maybe this should be fatal? */
+    }
+    nbytes = strlen(str3);
+    apr_file_write(conf->rewritelogfp, str3, &nbytes);
+    rv = apr_global_mutex_unlock(rewrite_log_lock);
+    if (rv != APR_SUCCESS) {
+        ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r,
+                      "apr_global_mutex_unlock(rewrite_log_lock) failed");
+        /* XXX: Maybe this should be fatal? */
+    }
+
+    va_end(ap);
+    return;
+}
+
+static char *current_logtime(request_rec *r)
+{
+    apr_time_exp_t t;
+    char tstr[80];
+    apr_size_t len;
+
+    apr_time_exp_lt(&t, apr_time_now());
+
+    apr_strftime(tstr, &len, 80, "[%d/%b/%Y:%H:%M:%S ", &t);
+    apr_snprintf(tstr + strlen(tstr), 80-strlen(tstr), "%c%.2d%.2d]",
+                 t.tm_gmtoff < 0 ? '-' : '+',
+                 t.tm_gmtoff / (60*60), t.tm_gmtoff % (60*60));
+    return apr_pstrdup(r->pool, tstr);
+}
+
+
+
+
+/*
+** +-------------------------------------------------------+
+** |                                                       |
+** |              rewriting lockfile support
+** |                                                       |
+** +-------------------------------------------------------+
+*/
+
+#define REWRITELOCK_MODE ( APR_UREAD | APR_UWRITE | APR_GREAD | APR_WREAD )
+
+static apr_status_t rewritelock_create(server_rec *s, apr_pool_t *p)
+{
+    apr_status_t rc;
+
+    /* only operate if a lockfile is used */
+    if (lockname == NULL || *(lockname) == '\0') {
+        return APR_SUCCESS;
+    }
+
+    /* create the lockfile */
+    rc = apr_global_mutex_create(&rewrite_mapr_lock_acquire, lockname,
+                                 APR_LOCK_DEFAULT, p);
+    if (rc != APR_SUCCESS) {
+        ap_log_error(APLOG_MARK, APLOG_CRIT, rc, s,
+                     "mod_rewrite: Parent could not create RewriteLock "
+                     "file %s", lockname);
+        return rc;
+    }
+
+#ifdef MOD_REWRITE_SET_MUTEX_PERMS
+    rc = unixd_set_global_mutex_perms(rewrite_mapr_lock_acquire);
+    if (rc != APR_SUCCESS) {
+        ap_log_error(APLOG_MARK, APLOG_CRIT, rc, s,
+                     "mod_rewrite: Parent could not set permissions "
+                     "on RewriteLock; check User and Group directives");
+        return rc;
+    }
+#endif
+
+    return APR_SUCCESS;
+}
+
+static apr_status_t rewritelock_remove(void *data)
+{
+    /* only operate if a lockfile is used */
+    if (lockname == NULL || *(lockname) == '\0') {
+        return APR_SUCCESS;
+    }
+
+    /* destroy the rewritelock */
+    apr_global_mutex_destroy (rewrite_mapr_lock_acquire);
+    rewrite_mapr_lock_acquire = NULL;
+    lockname = NULL;
+    return(0);
+}
+
+
+/*
+** +-------------------------------------------------------+
+** |                                                       |
+** |                  program map support
+** |                                                       |
+** +-------------------------------------------------------+
+*/
+
+static apr_status_t run_rewritemap_programs(server_rec *s, apr_pool_t *p)
+{
+    rewrite_server_conf *conf;
+    apr_array_header_t *rewritemaps;
+    rewritemap_entry *entries;
+    int i;
+    apr_status_t rc;
+
+    conf = ap_get_module_config(s->module_config, &rewrite_module);
+
+    /*  If the engine isn't turned on,
+     *  don't even try to do anything.
+     */
+    if (conf->state == ENGINE_DISABLED) {
+        return APR_SUCCESS;
+    }
+
+    rewritemaps = conf->rewritemaps;
+    entries = (rewritemap_entry *)rewritemaps->elts;
+    for (i = 0; i < rewritemaps->nelts; i++) {
+        apr_file_t *fpin = NULL;
+        apr_file_t *fpout = NULL;
+        rewritemap_entry *map = &entries[i];
+
+        if (map->type != MAPTYPE_PRG) {
+            continue;
+        }
+        if (map->argv[0] == NULL
+            || *(map->argv[0]) == '\0'
+            || map->fpin  != NULL
+            || map->fpout != NULL        ) {
+            continue;
+        }
+        rc = rewritemap_program_child(p, map->argv[0], map->argv,
+                                      &fpout, &fpin);
+        if (rc != APR_SUCCESS || fpin == NULL || fpout == NULL) {
+            ap_log_error(APLOG_MARK, APLOG_ERR, rc, s,
+                         "mod_rewrite: could not startup RewriteMap "
+                         "program %s", map->datafile);
+            return rc;
+        }
+        map->fpin  = fpin;
+        map->fpout = fpout;
+    }
+    return APR_SUCCESS;
+}
+
+/* child process code */
+static apr_status_t rewritemap_program_child(apr_pool_t *p,
+                                             const char *progname, char **argv,
+                                             apr_file_t **fpout,
+                                             apr_file_t **fpin)
+{
+    apr_status_t rc;
+    apr_procattr_t *procattr;
+    apr_proc_t *procnew;
+
+    if (((rc = apr_procattr_create(&procattr, p)) != APR_SUCCESS) ||
+        ((rc = apr_procattr_io_set(procattr, APR_FULL_BLOCK, APR_FULL_BLOCK,
+                                   APR_NO_PIPE)) != APR_SUCCESS) ||
+        ((rc = apr_procattr_dir_set(procattr,
+                                   ap_make_dirstr_parent(p, argv[0])))
+         != APR_SUCCESS) ||
+        ((rc = apr_procattr_cmdtype_set(procattr, APR_PROGRAM))
+         != APR_SUCCESS)) {
+        /* Something bad happened, give up and go away. */
+    }
+    else {
+        procnew = apr_pcalloc(p, sizeof(*procnew));
+        rc = apr_proc_create(procnew, argv[0], (const char **)argv, NULL,
+                             procattr, p);
+
+        if (rc == APR_SUCCESS) {
+            apr_pool_note_subprocess(p, procnew, APR_KILL_AFTER_TIMEOUT);
+
+            if (fpin) {
+                (*fpin) = procnew->in;
+            }
+
+            if (fpout) {
+                (*fpout) = procnew->out;
+            }
+        }
+    }
+
+    return (rc);
+}
+
+
+
+
+/*
+** +-------------------------------------------------------+
+** |                                                       |
+** |             environment variable support
+** |                                                       |
+** +-------------------------------------------------------+
+*/
+
+
+static char *lookup_variable(request_rec *r, char *var)
+{
+    const char *result;
+    char resultbuf[LONG_STRING_LEN];
+    apr_time_exp_t tm;
+    request_rec *rsub;
+
+    result = NULL;
+
+    /* HTTP headers */
+    if (strcasecmp(var, "HTTP_USER_AGENT") == 0) {
+        result = lookup_header(r, "User-Agent");
+    }
+    else if (strcasecmp(var, "HTTP_REFERER") == 0) {
+        result = lookup_header(r, "Referer");
+    }
+    else if (strcasecmp(var, "HTTP_COOKIE") == 0) {
+        result = lookup_header(r, "Cookie");
+    }
+    else if (strcasecmp(var, "HTTP_FORWARDED") == 0) {
+        result = lookup_header(r, "Forwarded");
+    }
+    else if (strcasecmp(var, "HTTP_HOST") == 0) {
+        result = lookup_header(r, "Host");
+    }
+    else if (strcasecmp(var, "HTTP_PROXY_CONNECTION") == 0) {
+        result = lookup_header(r, "Proxy-Connection");
+    }
+    else if (strcasecmp(var, "HTTP_ACCEPT") == 0) {
+        result = lookup_header(r, "Accept");
+    }
+    /* all other headers from which we are still not know about */
+    else if (strlen(var) > 5 && strncasecmp(var, "HTTP:", 5) == 0) {
+        result = lookup_header(r, var+5);
+    }
+
+    /* connection stuff */
+    else if (strcasecmp(var, "REMOTE_ADDR") == 0) {
+        result = r->connection->remote_ip;
+    }
+    else if (strcasecmp(var, "REMOTE_PORT") == 0) {
+        return apr_itoa(r->pool, r->connection->remote_addr->port);
+    }
+    else if (strcasecmp(var, "REMOTE_HOST") == 0) {
+        result = (char *)ap_get_remote_host(r->connection,
+                                            r->per_dir_config, REMOTE_NAME, NULL);
+    }
+    else if (strcasecmp(var, "REMOTE_USER") == 0) {
+        result = r->user;
+    }
+    else if (strcasecmp(var, "REMOTE_IDENT") == 0) {
+        result = (char *)ap_get_remote_logname(r);
+    }
+
+    /* request stuff */
+    else if (strcasecmp(var, "THE_REQUEST") == 0) { /* non-standard */
+        result = r->the_request;
+    }
+    else if (strcasecmp(var, "REQUEST_METHOD") == 0) {
+        result = r->method;
+    }
+    else if (strcasecmp(var, "REQUEST_URI") == 0) { /* non-standard */
+        result = r->uri;
+    }
+    else if (strcasecmp(var, "SCRIPT_FILENAME") == 0 ||
+             strcasecmp(var, "REQUEST_FILENAME") == 0  ) {
+        result = r->filename;
+    }
+    else if (strcasecmp(var, "PATH_INFO") == 0) {
+        result = r->path_info;
+    }
+    else if (strcasecmp(var, "QUERY_STRING") == 0) {
+        result = r->args;
+    }
+    else if (strcasecmp(var, "AUTH_TYPE") == 0) {
+        result = r->ap_auth_type;
+    }
+    else if (strcasecmp(var, "IS_SUBREQ") == 0) { /* non-standard */
+        result = (r->main != NULL ? "true" : "false");
+    }
+
+    /* internal server stuff */
+    else if (strcasecmp(var, "DOCUMENT_ROOT") == 0) {
+        result = ap_document_root(r);
+    }
+    else if (strcasecmp(var, "SERVER_ADMIN") == 0) {
+        result = r->server->server_admin;
+    }
+    else if (strcasecmp(var, "SERVER_NAME") == 0) {
+        result = ap_get_server_name(r);
+    }
+    else if (strcasecmp(var, "SERVER_ADDR") == 0) { /* non-standard */
+        result = r->connection->local_ip;
+    }
+    else if (strcasecmp(var, "SERVER_PORT") == 0) {
+        apr_snprintf(resultbuf, sizeof(resultbuf), "%u", ap_get_server_port(r));
+        result = resultbuf;
+    }
+    else if (strcasecmp(var, "SERVER_PROTOCOL") == 0) {
+        result = r->protocol;
+    }
+    else if (strcasecmp(var, "SERVER_SOFTWARE") == 0) {
+        result = ap_get_server_version();
+    }
+    else if (strcasecmp(var, "API_VERSION") == 0) { /* non-standard */
+        apr_snprintf(resultbuf, sizeof(resultbuf), "%d:%d",
+                     MODULE_MAGIC_NUMBER_MAJOR, MODULE_MAGIC_NUMBER_MINOR);
+        result = resultbuf;
+    }
+
+/* XXX: wow this has gotta be slow if you actually use it for a lot, recalculates exploded time for each variable */
+    /* underlaying Unix system stuff */
+    else if (strcasecmp(var, "TIME_YEAR") == 0) {
+        apr_time_exp_lt(&tm, apr_time_now());
+        apr_snprintf(resultbuf, sizeof(resultbuf), "%04d", tm.tm_year + 1900);
+        result = resultbuf;
+    }
+#define MKTIMESTR(format, tmfield) \
+    apr_time_exp_lt(&tm, apr_time_now()); \
+    apr_snprintf(resultbuf, sizeof(resultbuf), format, tm.tmfield); \
+    result = resultbuf;
+    else if (strcasecmp(var, "TIME_MON") == 0) {
+        MKTIMESTR("%02d", tm_mon+1)
+    }
+    else if (strcasecmp(var, "TIME_DAY") == 0) {
+        MKTIMESTR("%02d", tm_mday)
+    }
+    else if (strcasecmp(var, "TIME_HOUR") == 0) {
+        MKTIMESTR("%02d", tm_hour)
+    }
+    else if (strcasecmp(var, "TIME_MIN") == 0) {
+        MKTIMESTR("%02d", tm_min)
+    }
+    else if (strcasecmp(var, "TIME_SEC") == 0) {
+        MKTIMESTR("%02d", tm_sec)
+    }
+    else if (strcasecmp(var, "TIME_WDAY") == 0) {
+        MKTIMESTR("%d", tm_wday)
+    }
+    else if (strcasecmp(var, "TIME") == 0) {
+        apr_time_exp_lt(&tm, apr_time_now());
+        apr_snprintf(resultbuf, sizeof(resultbuf),
+                     "%04d%02d%02d%02d%02d%02d", tm.tm_year + 1900,
+                     tm.tm_mon+1, tm.tm_mday,
+                     tm.tm_hour, tm.tm_min, tm.tm_sec);
+        result = resultbuf;
+        rewritelog(r, 1, "RESULT='%s'", result);
+    }
+
+    /* all other env-variables from the parent Apache process */
+    else if (strlen(var) > 4 && strncasecmp(var, "ENV:", 4) == 0) {
+        /* first try the internal Apache notes structure */
+        result = apr_table_get(r->notes, var+4);
+        /* second try the internal Apache env structure  */
+        if (result == NULL) {
+            result = apr_table_get(r->subprocess_env, var+4);
+        }
+        /* third try the external OS env */
+        if (result == NULL) {
+            result = getenv(var+4);
+        }
+    }
+    else if (strlen(var) > 4 && !strncasecmp(var, "SSL:", 4) 
+             && rewrite_ssl_lookup) {
+        result = rewrite_ssl_lookup(r->pool, r->server, r->connection, r, 
+                                    var + 4);
+    }
+
+#define LOOKAHEAD(subrecfunc) \
+        if ( \
+          /* filename is safe to use */ \
+          r->filename != NULL \
+              /* - and we're either not in a subrequest */ \
+              && ( r->main == NULL \
+                  /* - or in a subrequest where paths are non-NULL... */ \
+                    || ( r->main->uri != NULL && r->uri != NULL \
+                        /*   ...and sub and main paths differ */ \
+                        && strcmp(r->main->uri, r->uri) != 0))) { \
+            /* process a file-based subrequest */ \
+            rsub = subrecfunc(r->filename, r, NULL); \
+            /* now recursively lookup the variable in the sub_req */ \
+            result = lookup_variable(rsub, var+5); \
+            /* copy it up to our scope before we destroy sub_req's apr_pool_t */ \
+            result = apr_pstrdup(r->pool, result); \
+            /* cleanup by destroying the subrequest */ \
+            ap_destroy_sub_req(rsub); \
+            /* log it */ \
+            rewritelog(r, 5, "lookahead: path=%s var=%s -> val=%s", \
+                       r->filename, var+5, result); \
+            /* return ourself to prevent re-pstrdup */ \
+            return (char *)result; \
+        }
+
+    /* look-ahead for parameter through URI-based sub-request */
+    else if (strlen(var) > 5 && strncasecmp(var, "LA-U:", 5) == 0) {
+        LOOKAHEAD(ap_sub_req_lookup_uri)
+    }
+    /* look-ahead for parameter through file-based sub-request */
+    else if (strlen(var) > 5 && strncasecmp(var, "LA-F:", 5) == 0) {
+        LOOKAHEAD(ap_sub_req_lookup_file)
+    }
+
+    /* file stuff */
+    else if (strcasecmp(var, "SCRIPT_USER") == 0) {
+        result = "<unknown>";
+        if (r->finfo.valid & APR_FINFO_USER) {
+            apr_get_username((char **)&result, r->finfo.user, r->pool);
+        }
+    }
+    else if (strcasecmp(var, "SCRIPT_GROUP") == 0) {
+        result = "<unknown>";
+        if (r->finfo.valid & APR_FINFO_GROUP) {
+            apr_group_name_get((char **)&result, r->finfo.group, r->pool);
+        }
+    } else if (strcasecmp(var, "HTTPS") == 0) {
+        int flag = rewrite_is_https && rewrite_is_https(r->connection);
+        result = flag ? "on" : "off";
+    }
+
+    if (result == NULL) {
+        return apr_pstrdup(r->pool, "");
+    }
+    else {
+        return apr_pstrdup(r->pool, result);
+    }
+}
+
+static char *lookup_header(request_rec *r, const char *name)
+{
+    const apr_array_header_t *hdrs_arr;
+    const apr_table_entry_t *hdrs;
+    int i;
+
+    hdrs_arr = apr_table_elts(r->headers_in);
+    hdrs = (const apr_table_entry_t *)hdrs_arr->elts;
+    for (i = 0; i < hdrs_arr->nelts; ++i) {
+        if (hdrs[i].key == NULL) {
+            continue;
+        }
+        if (strcasecmp(hdrs[i].key, name) == 0) {
+            apr_table_merge(r->notes, VARY_KEY_THIS, name);
+            return hdrs[i].val;
+        }
+    }
+    return NULL;
+}
+
+
+
+
+/*
+** +-------------------------------------------------------+
+** |                                                       |
+** |                    caching support
+** |                                                       |
+** +-------------------------------------------------------+
+*/
+
+
+static cache *init_cache(apr_pool_t *p)
+{
+    cache *c;
+
+    c = (cache *)apr_palloc(p, sizeof(cache));
+    if (apr_pool_create(&c->pool, p) != APR_SUCCESS) {
+        return NULL;
+    }
+    c->lists = apr_array_make(c->pool, 2, sizeof(cachelist));
+#if APR_HAS_THREADS
+    (void)apr_thread_mutex_create(&(c->lock), APR_THREAD_MUTEX_DEFAULT, p);
+#endif
+    return c;
+}
+
+static void set_cache_string(cache *c, const char *res, int mode, apr_time_t t,
+                             char *key, char *value)
+{
+    cacheentry ce;
+
+    ce.time  = t;
+    ce.key   = key;
+    ce.value = value;
+    store_cache_string(c, res, &ce);
+    return;
+}
+
+static char *get_cache_string(cache *c, const char *res, int mode,
+                              apr_time_t t, char *key)
+{
+    cacheentry *ce;
+
+    ce = retrieve_cache_string(c, res, key);
+    if (ce == NULL) {
+        return NULL;
+    }
+    if (mode & CACHEMODE_TS) {
+        if (t != ce->time) {
+            return NULL;
+        }
+    }
+    else if (mode & CACHEMODE_TTL) {
+        if (t > ce->time) {
+            return NULL;
+        }
+    }
+    return ce->value;
+}
+
+static int cache_tlb_hash(char *key)
+{
+    unsigned long n;
+    char *p;
+
+    n = 0;
+    for (p = key; *p != '\0'; p++) {
+        n = ((n << 5) + n) ^ (unsigned long)(*p++);
+    }
+
+    return n % CACHE_TLB_ROWS;
+}
+
+static cacheentry *cache_tlb_lookup(cachetlbentry *tlb, cacheentry *elt,
+                                    char *key)
+{
+    int ix = cache_tlb_hash(key);
+    int i;
+    int j;
+
+    for (i=0; i < CACHE_TLB_COLS; ++i) {
+        j = tlb[ix].t[i];
+        if (j < 0)
+            return NULL;
+        if (strcmp(elt[j].key, key) == 0)
+            return &elt[j];
+    }
+    return NULL;
+}
+
+static void cache_tlb_replace(cachetlbentry *tlb, cacheentry *elt,
+                              cacheentry *e)
+{
+    int ix = cache_tlb_hash(e->key);
+    int i;
+
+    tlb = &tlb[ix];
+
+    for (i=1; i < CACHE_TLB_COLS; ++i)
+        tlb->t[i] = tlb->t[i-1];
+
+    tlb->t[0] = e - elt;
+}
+
+static void store_cache_string(cache *c, const char *res, cacheentry *ce)
+{
+    int i;
+    int j;
+    cachelist *l;
+    cacheentry *e;
+    cachetlbentry *t;
+    int found_list;
+
+#if APR_HAS_THREADS
+    apr_thread_mutex_lock(c->lock);
+#endif
+
+    found_list = 0;
+    /* first try to edit an existing entry */
+    for (i = 0; i < c->lists->nelts; i++) {
+        l = &(((cachelist *)c->lists->elts)[i]);
+        if (strcmp(l->resource, res) == 0) {
+            found_list = 1;
+
+            e = cache_tlb_lookup((cachetlbentry *)l->tlb->elts,
+                                 (cacheentry *)l->entries->elts, ce->key);
+            if (e != NULL) {
+                e->time  = ce->time;
+                e->value = apr_pstrdup(c->pool, ce->value);
+#if APR_HAS_THREADS
+                apr_thread_mutex_unlock(c->lock);
+#endif
+                return;
+            }
+
+            for (j = 0; j < l->entries->nelts; j++) {
+                e = &(((cacheentry *)l->entries->elts)[j]);
+                if (strcmp(e->key, ce->key) == 0) {
+                    e->time  = ce->time;
+                    e->value = apr_pstrdup(c->pool, ce->value);
+                    cache_tlb_replace((cachetlbentry *)l->tlb->elts,
+                                      (cacheentry *)l->entries->elts, e);
+#if APR_HAS_THREADS
+                    apr_thread_mutex_unlock(c->lock);
+#endif
+                    return;
+                }
+            }
+        }
+    }
+
+    /* create a needed new list */
+    if (!found_list) {
+        l = apr_array_push(c->lists);
+        l->resource = apr_pstrdup(c->pool, res);
+        l->entries  = apr_array_make(c->pool, 2, sizeof(cacheentry));
+        l->tlb      = apr_array_make(c->pool, CACHE_TLB_ROWS,
+                                    sizeof(cachetlbentry));
+        for (i=0; i<CACHE_TLB_ROWS; ++i) {
+            t = &((cachetlbentry *)l->tlb->elts)[i];
+                for (j=0; j<CACHE_TLB_COLS; ++j)
+                    t->t[j] = -1;
+        }
+    }
+
+    /* create the new entry */
+    for (i = 0; i < c->lists->nelts; i++) {
+        l = &(((cachelist *)c->lists->elts)[i]);
+        if (strcmp(l->resource, res) == 0) {
+            e = apr_array_push(l->entries);
+            e->time  = ce->time;
+            e->key   = apr_pstrdup(c->pool, ce->key);
+            e->value = apr_pstrdup(c->pool, ce->value);
+            cache_tlb_replace((cachetlbentry *)l->tlb->elts,
+                              (cacheentry *)l->entries->elts, e);
+#if APR_HAS_THREADS
+            apr_thread_mutex_unlock(c->lock);
+#endif
+            return;
+        }
+    }
+
+    /* not reached, but when it is no problem... */
+#if APR_HAS_THREADS
+    apr_thread_mutex_unlock(c->lock);
+#endif
+    return;
+}
+
+static cacheentry *retrieve_cache_string(cache *c, const char *res, char *key)
+{
+    int i;
+    int j;
+    cachelist *l;
+    cacheentry *e;
+
+#if APR_HAS_THREADS
+    apr_thread_mutex_lock(c->lock);
+#endif
+
+    for (i = 0; i < c->lists->nelts; i++) {
+        l = &(((cachelist *)c->lists->elts)[i]);
+        if (strcmp(l->resource, res) == 0) {
+
+            e = cache_tlb_lookup((cachetlbentry *)l->tlb->elts,
+                                 (cacheentry *)l->entries->elts, key);
+            if (e != NULL) {
+#if APR_HAS_THREADS
+                apr_thread_mutex_unlock(c->lock);
+#endif
+                return e;
+            }
+
+            for (j = 0; j < l->entries->nelts; j++) {
+                e = &(((cacheentry *)l->entries->elts)[j]);
+                if (strcmp(e->key, key) == 0) {
+#if APR_HAS_THREADS
+                    apr_thread_mutex_unlock(c->lock);
+#endif
+                    return e;
+                }
+            }
+        }
+    }
+#if APR_HAS_THREADS
+    apr_thread_mutex_unlock(c->lock);
+#endif
+    return NULL;
+}
+
+
+
+
+/*
+** +-------------------------------------------------------+
+** |                                                       |
+** |                    misc functions
+** |                                                       |
+** +-------------------------------------------------------+
+*/
+
+/*
+ * substitute the prefix path 'match' in 'input' with 'subst'
+ * (think of RewriteBase which substitutes the physical path with
+ *  the virtual path)
+ */
+
+static char *subst_prefix_path(request_rec *r, char *input, char *match,
+                               const char *subst)
+{
+    apr_size_t len = strlen(match);
+
+    if (len && match[len - 1] == '/') {
+        --len;
+    }
+
+    if (!strncmp(input, match, len) && input[len++] == '/') {
+        apr_size_t slen, outlen;
+        char *output;
+
+        rewritelog(r, 5, "strip matching prefix: %s -> %s", input, input+len);
+
+        slen = strlen(subst);
+        if (slen && subst[slen - 1] != '/') {
+            ++slen;
+        }
+
+        outlen = strlen(input) + slen - len;
+        output = apr_palloc(r->pool, outlen + 1); /* don't forget the \0 */
+
+        memcpy(output, subst, slen);
+        if (slen && !output[slen-1]) {
+            output[slen-1] = '/';
+        }
+        memcpy(output+slen, input+len, outlen - slen);
+        output[outlen] = '\0';
+
+        rewritelog(r, 4, "add subst prefix: %s -> %s", input+len, output);
+
+        return output;
+    }
+
+    /* prefix didn't match */
+    return input;
+}
+
+
+/*
+**
+**  own command line parser which don't have the '\\' problem
+**
+*/
+
+static int parseargline(char *str, char **a1, char **a2, char **a3)
+{
+    char *cp;
+    int isquoted;
+
+#define SKIP_WHITESPACE(cp) \
+    for ( ; *cp == ' ' || *cp == '\t'; ) { \
+        cp++; \
+    };
+
+#define CHECK_QUOTATION(cp,isquoted) \
+    isquoted = 0; \
+    if (*cp == '"') { \
+        isquoted = 1; \
+        cp++; \
+    }
+
+#define DETERMINE_NEXTSTRING(cp,isquoted) \
+    for ( ; *cp != '\0'; cp++) { \
+        if (   (isquoted    && (*cp     == ' ' || *cp     == '\t')) \
+            || (*cp == '\\' && (*(cp+1) == ' ' || *(cp+1) == '\t'))) { \
+            cp++; \
+            continue; \
+        } \
+        if (   (!isquoted && (*cp == ' ' || *cp == '\t')) \
+            || (isquoted  && *cp == '"')                  ) { \
+            break; \
+        } \
+    }
+
+    cp = str;
+    SKIP_WHITESPACE(cp);
+
+    /*  determine first argument */
+    CHECK_QUOTATION(cp, isquoted);
+    *a1 = cp;
+    DETERMINE_NEXTSTRING(cp, isquoted);
+    if (*cp == '\0') {
+        return 1;
+    }
+    *cp++ = '\0';
+
+    SKIP_WHITESPACE(cp);
+
+    /*  determine second argument */
+    CHECK_QUOTATION(cp, isquoted);
+    *a2 = cp;
+    DETERMINE_NEXTSTRING(cp, isquoted);
+    if (*cp == '\0') {
+        *cp++ = '\0';
+        *a3 = NULL;
+        return 0;
+    }
+    *cp++ = '\0';
+
+    SKIP_WHITESPACE(cp);
+
+    /* again check if there are only two arguments */
+    if (*cp == '\0') {
+        *cp++ = '\0';
+        *a3 = NULL;
+        return 0;
+    }
+
+    /*  determine second argument */
+    CHECK_QUOTATION(cp, isquoted);
+    *a3 = cp;
+    DETERMINE_NEXTSTRING(cp, isquoted);
+    *cp++ = '\0';
+
+    return 0;
+}
+
+
+static void add_env_variable(request_rec *r, char *s)
+{
+    char var[MAX_STRING_LEN];
+    char val[MAX_STRING_LEN];
+    char *cp;
+    int n;
+
+    if ((cp = strchr(s, ':')) != NULL) {
+        n = ((cp-s) > MAX_STRING_LEN-1 ? MAX_STRING_LEN-1 : (cp-s));
+        memcpy(var, s, n);
+        var[n] = '\0';
+        apr_cpystrn(val, cp+1, sizeof(val));
+        apr_table_set(r->subprocess_env, var, val);
+        rewritelog(r, 5, "setting env variable '%s' to '%s'", var, val);
+    }
+}
+
+static void add_cookie(request_rec *r, char *s)
+{
+    char *var;
+    char *val;
+    char *domain;
+    char *expires;
+    char *path;
+
+    char *tok_cntx;
+    char *cookie;
+
+    if (s) {
+        var = apr_strtok(s, ":", &tok_cntx);
+        val = apr_strtok(NULL, ":", &tok_cntx);
+        domain = apr_strtok(NULL, ":", &tok_cntx);
+        /** the line below won't hit the token ever **/
+        expires = apr_strtok(NULL, ":", &tok_cntx);
+        if (expires) {
+            path = apr_strtok(NULL,":", &tok_cntx);
+        }
+        else {
+            path = NULL;
+        }
+
+        if (var && val && domain) {
+            /* FIX: use cached time similar to how logging does it */
+            request_rec *rmain = r;
+            char *notename;
+            void *data;
+            while (rmain->main) {
+                rmain = rmain->main;
+            }
+
+            notename = apr_pstrcat(rmain->pool, var, "_rewrite", NULL);
+            apr_pool_userdata_get(&data, notename, rmain->pool);
+            if (data == NULL) {
+                cookie = apr_pstrcat(rmain->pool,
+                                     var, "=", val,
+                                     "; path=", (path)? path : "/",
+                                     "; domain=", domain,
+                                     (expires)? "; expires=" : NULL,
+                                     (expires)?
+                                     ap_ht_time(r->pool,
+                                                r->request_time +
+                                                apr_time_from_sec((60 *
+                                                               atol(expires))),
+                                                "%a, %d-%b-%Y %T GMT", 1)
+                                              : NULL,
+                                     NULL);
+                /*
+                 * XXX: should we add it to err_headers_out as well ?
+                 * if we do we need to be careful that only ONE gets sent out
+                 */
+                apr_table_add(rmain->err_headers_out, "Set-Cookie", cookie);
+                apr_pool_userdata_set("set", notename, NULL, rmain->pool);
+                rewritelog(rmain, 5, "setting cookie '%s'", cookie);
+            }
+            else {
+                rewritelog(rmain, 5, "skipping already set cookie '%s'", var);
+            }
+        }
+    }
+}
+
+
+/*
+**
+**  check that a subrequest won't cause infinite recursion
+**
+*/
+
+static int subreq_ok(request_rec *r)
+{
+    /*
+     * either not in a subrequest, or in a subrequest
+     * and URIs aren't NULL and sub/main URIs differ
+     */
+    return (r->main == NULL
+            || (r->main->uri != NULL
+                && r->uri != NULL
+                && strcmp(r->main->uri, r->uri) != 0));
+}
+
+
+/*
+**
+**  stat() for only the prefix of a path
+**
+*/
+
+static int prefix_stat(const char *path, apr_pool_t *pool)
+{
+    const char *curpath = path;
+    const char *root;
+    const char *slash;
+    char *statpath;
+    apr_status_t rv;
+
+    rv = apr_filepath_root(&root, &curpath, APR_FILEPATH_TRUENAME, pool);
+
+    if (rv != APR_SUCCESS) {
+        return 0;
+    }
+
+    /* let's recognize slashes only, the mod_rewrite semantics are opaque
+     * enough.
+     */
+    if ((slash = ap_strchr_c(curpath, '/')) != NULL) {
+        rv = apr_filepath_merge(&statpath, root,
+                                apr_pstrndup(pool, curpath,
+                                             (apr_size_t)(slash - curpath)),
+                                APR_FILEPATH_NOTABOVEROOT |
+                                APR_FILEPATH_NOTRELATIVE, pool);
+    }
+    else {
+        rv = apr_filepath_merge(&statpath, root, curpath,
+                                APR_FILEPATH_NOTABOVEROOT |
+                                APR_FILEPATH_NOTRELATIVE, pool);
+    }
+
+    if (rv == APR_SUCCESS) {
+        apr_finfo_t sb;
+        
+        if (apr_stat(&sb, statpath, APR_FINFO_MIN, pool) == APR_SUCCESS) {
+            return 1;
+        }
+    }
+
+    return 0;
+}
+
+
+/*
+**
+**  Lexicographic Compare
+**
+*/
+
+static int compare_lexicography(char *cpNum1, char *cpNum2)
+{
+    int i;
+    int n1, n2;
+
+    n1 = strlen(cpNum1);
+    n2 = strlen(cpNum2);
+    if (n1 > n2) {
+        return 1;
+    }
+    if (n1 < n2) {
+        return -1;
+    }
+    for (i = 0; i < n1; i++) {
+        if (cpNum1[i] > cpNum2[i]) {
+            return 1;
+        }
+        if (cpNum1[i] < cpNum2[i]) {
+            return -1;
+        }
+    }
+    return 0;
+}
+
+/*
+**
+**  Bracketed expression handling
+**  s points after the opening bracket
+**
+*/
+
+static char *find_closing_bracket(char *s, int left, int right)
+{
+    int depth;
+
+    for (depth = 1; *s; ++s) {
+        if (*s == right && --depth == 0) {
+            return s;
+        }
+        else if (*s == left) {
+            ++depth;
+        }
+    }
+    return NULL;
+}
+
+static char *find_char_in_brackets(char *s, int c, int left, int right)
+{
+    int depth;
+
+    for (depth = 1; *s; ++s) {
+        if (*s == c && depth == 1) {
+            return s;
+        }
+        else if (*s == right && --depth == 0) {
+            return NULL;
+        }
+        else if (*s == left) {
+            ++depth;
+        }
+    }
+    return NULL;
+}
+
+/*
+**
+** Module paraphernalia
+**
+*/
+
+    /* the apr_table_t of commands we provide */
+static const command_rec command_table[] = {
+    AP_INIT_FLAG(    "RewriteEngine",   cmd_rewriteengine,  NULL, OR_FILEINFO,
+                     "On or Off to enable or disable (default) the whole "
+                     "rewriting engine"),
+    AP_INIT_ITERATE( "RewriteOptions",  cmd_rewriteoptions,  NULL, OR_FILEINFO,
+                     "List of option strings to set"),
+    AP_INIT_TAKE1(   "RewriteBase",     cmd_rewritebase,     NULL, OR_FILEINFO,
+                     "the base URL of the per-directory context"),
+    AP_INIT_RAW_ARGS("RewriteCond",     cmd_rewritecond,     NULL, OR_FILEINFO,
+                     "an input string and a to be applied regexp-pattern"),
+    AP_INIT_RAW_ARGS("RewriteRule",     cmd_rewriterule,     NULL, OR_FILEINFO,
+                     "an URL-applied regexp-pattern and a substitution URL"),
+    AP_INIT_TAKE2(   "RewriteMap",      cmd_rewritemap,      NULL, RSRC_CONF,
+                     "a mapname and a filename"),
+    AP_INIT_TAKE1(   "RewriteLock",     cmd_rewritelock,     NULL, RSRC_CONF,
+                     "the filename of a lockfile used for inter-process "
+                     "synchronization"),
+    AP_INIT_TAKE1(   "RewriteLog",      cmd_rewritelog,      NULL, RSRC_CONF,
+                     "the filename of the rewriting logfile"),
+    AP_INIT_TAKE1(   "RewriteLogLevel", cmd_rewriteloglevel, NULL, RSRC_CONF,
+                     "the level of the rewriting logfile verbosity "
+                     "(0=none, 1=std, .., 9=max)"),
+    { NULL }
+};
+
+static void register_hooks(apr_pool_t *p)
+{
+    /* fixup after mod_proxy, so that the proxied url will not
+     * escaped accidentally by mod_proxy's fixup.
+     */
+    static const char * const aszPre[]={ "mod_proxy.c", NULL };
+
+    /* check type before mod_mime, so that [T=foo/bar] will not be
+     * overridden by AddType definitions.
+     */
+    static const char * const ct_aszSucc[]={ "mod_mime.c", NULL };
+
+    APR_REGISTER_OPTIONAL_FN(ap_register_rewrite_mapfunc);
+
+    ap_hook_handler(handler_redirect, NULL, NULL, APR_HOOK_MIDDLE);
+    ap_hook_pre_config(pre_config, NULL, NULL, APR_HOOK_MIDDLE);
+    ap_hook_post_config(post_config, NULL, NULL, APR_HOOK_MIDDLE);
+    ap_hook_child_init(init_child, NULL, NULL, APR_HOOK_MIDDLE);
+
+    ap_hook_fixups(hook_fixup, aszPre, NULL, APR_HOOK_FIRST);
+    ap_hook_translate_name(hook_uri2file, NULL, NULL, APR_HOOK_FIRST);
+    ap_hook_type_checker(hook_mimetype, NULL, ct_aszSucc, APR_HOOK_MIDDLE);
+}
+
+    /* the main config structure */
+module AP_MODULE_DECLARE_DATA rewrite_module = {
+   STANDARD20_MODULE_STUFF,
+   config_perdir_create,        /* create per-dir    config structures */
+   config_perdir_merge,         /* merge  per-dir    config structures */
+   config_server_create,        /* create per-server config structures */
+   config_server_merge,         /* merge  per-server config structures */
+   command_table,               /* table of config file commands       */
+   register_hooks               /* register hooks                      */
+};
+
+/*EOF*/