new file mode 100644
--- /dev/null
+++ b/src/http/modules/ngx_http_log_module.c
@@ -0,0 +1,1263 @@
+
+/*
+ * Copyright (C) Igor Sysoev
+ */
+
+
+#include <ngx_config.h>
+#include <ngx_core.h>
+#include <ngx_http.h>
+#include <nginx.h>
+
+
+static u_char *ngx_http_log_addr(ngx_http_request_t *r, u_char *buf,
+    ngx_http_log_op_t *op);
+static u_char *ngx_http_log_connection(ngx_http_request_t *r, u_char *buf,
+    ngx_http_log_op_t *op);
+static u_char *ngx_http_log_pipe(ngx_http_request_t *r, u_char *buf,
+    ngx_http_log_op_t *op);
+static u_char *ngx_http_log_time(ngx_http_request_t *r, u_char *buf,
+    ngx_http_log_op_t *op);
+static u_char *ngx_http_log_msec(ngx_http_request_t *r, u_char *buf,
+    ngx_http_log_op_t *op);
+static u_char *ngx_http_log_request_time(ngx_http_request_t *r, u_char *buf,
+    ngx_http_log_op_t *op);
+static u_char *ngx_http_log_status(ngx_http_request_t *r, u_char *buf,
+    ngx_http_log_op_t *op);
+static u_char *ngx_http_log_length(ngx_http_request_t *r, u_char *buf,
+    ngx_http_log_op_t *op);
+static u_char *ngx_http_log_apache_length(ngx_http_request_t *r, u_char *buf,
+    ngx_http_log_op_t *op);
+static u_char *ngx_http_log_request_length(ngx_http_request_t *r, u_char *buf,
+    ngx_http_log_op_t *op);
+
+static size_t ngx_http_log_request_getlen(ngx_http_request_t *r,
+    uintptr_t data);
+static u_char *ngx_http_log_request(ngx_http_request_t *r, u_char *buf,
+    ngx_http_log_op_t *op);
+
+static ngx_int_t ngx_http_log_header_in_compile(ngx_conf_t *cf,
+    ngx_http_log_op_t *op, ngx_str_t *value);
+static size_t ngx_http_log_header_in_getlen(ngx_http_request_t *r,
+    uintptr_t data);
+static u_char *ngx_http_log_header_in(ngx_http_request_t *r, u_char *buf,
+    ngx_http_log_op_t *op);
+static size_t ngx_http_log_unknown_header_in_getlen(ngx_http_request_t *r,
+    uintptr_t data);
+static u_char *ngx_http_log_unknown_header_in(ngx_http_request_t *r,
+    u_char *buf, ngx_http_log_op_t *op);
+
+static ngx_int_t ngx_http_log_header_out_compile(ngx_conf_t *cf,
+    ngx_http_log_op_t *op, ngx_str_t *value);
+static size_t ngx_http_log_header_out_getlen(ngx_http_request_t *r,
+    uintptr_t data);
+static u_char *ngx_http_log_header_out(ngx_http_request_t *r, u_char *buf,
+    ngx_http_log_op_t *op);
+static size_t ngx_http_log_unknown_header_out_getlen(ngx_http_request_t *r,
+    uintptr_t data);
+static u_char *ngx_http_log_unknown_header_out(ngx_http_request_t *r,
+    u_char *buf, ngx_http_log_op_t *op);
+
+static u_char *ngx_http_log_connection_header_out(ngx_http_request_t *r,
+    u_char *buf, ngx_http_log_op_t *op);
+static u_char *ngx_http_log_transfer_encoding_header_out(ngx_http_request_t *r,
+    u_char *buf, ngx_http_log_op_t *op);
+
+static ngx_table_elt_t *ngx_http_log_unknown_header(ngx_list_t *headers,
+    ngx_str_t *value);
+
+static ngx_int_t ngx_http_log_variable_compile(ngx_conf_t *cf,
+    ngx_http_log_op_t *op, ngx_str_t *value);
+static size_t ngx_http_log_variable_getlen(ngx_http_request_t *r,
+    uintptr_t data);
+static u_char *ngx_http_log_variable(ngx_http_request_t *r, u_char *buf,
+    ngx_http_log_op_t *op);
+
+
+static ngx_int_t ngx_http_log_set_formats(ngx_conf_t *cf);
+static void *ngx_http_log_create_main_conf(ngx_conf_t *cf);
+static void *ngx_http_log_create_loc_conf(ngx_conf_t *cf);
+static char *ngx_http_log_merge_loc_conf(ngx_conf_t *cf, void *parent,
+    void *child);
+static char *ngx_http_log_set_log(ngx_conf_t *cf, ngx_command_t *cmd,
+    void *conf);
+static char *ngx_http_log_set_format(ngx_conf_t *cf, ngx_command_t *cmd,
+    void *conf);
+static ngx_int_t ngx_http_log_init(ngx_cycle_t *cycle);
+
+
+static ngx_command_t  ngx_http_log_commands[] = {
+
+    { ngx_string("log_format"),
+      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_2MORE,
+      ngx_http_log_set_format,
+      NGX_HTTP_MAIN_CONF_OFFSET,
+      0,
+      NULL },
+
+    { ngx_string("access_log"),
+      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE12,
+      ngx_http_log_set_log,
+      NGX_HTTP_LOC_CONF_OFFSET,
+      0,
+      NULL },
+
+      ngx_null_command
+};
+
+
+ngx_http_module_t  ngx_http_log_module_ctx = {
+    ngx_http_log_set_formats,              /* preconfiguration */
+    NULL,                                  /* postconfiguration */
+
+    ngx_http_log_create_main_conf,         /* create main configuration */
+    NULL,                                  /* init main configuration */
+
+    NULL,                                  /* create server configuration */
+    NULL,                                  /* merge server configuration */
+
+    ngx_http_log_create_loc_conf,          /* create location configration */
+    ngx_http_log_merge_loc_conf            /* merge location configration */
+};
+
+
+ngx_module_t  ngx_http_log_module = {
+    NGX_MODULE_V1,
+    &ngx_http_log_module_ctx,              /* module context */
+    ngx_http_log_commands,                 /* module directives */
+    NGX_HTTP_MODULE,                       /* module type */
+    NULL,                                  /* init master */
+    ngx_http_log_init,                     /* init module */
+    NULL,                                  /* init process */
+    NULL,                                  /* init thread */
+    NULL,                                  /* exit thread */
+    NULL,                                  /* exit process */
+    NULL,                                  /* exit master */
+    NGX_MODULE_V1_PADDING
+};
+
+
+static ngx_str_t http_access_log = ngx_string(NGX_HTTP_LOG_PATH);
+
+
+static ngx_str_t ngx_http_combined_fmt =
+#if 0
+    ngx_string("$remote_addr - $remote_user [%time] "
+               "\"$request\" %status %apache_length "
+               "\"$http_referer\" \"$http_user_agent\"");
+#endif
+    ngx_string("%addr - - [%time] "
+               "\"%request\" %status %apache_length "
+               "\"%{referer}i\" \"%{user-agent}i\"");
+
+
+ngx_http_log_op_name_t ngx_http_log_fmt_ops[] = {
+    { ngx_string("addr"), INET_ADDRSTRLEN - 1, NULL, NULL, ngx_http_log_addr },
+    { ngx_string("conn"), NGX_ATOMIC_T_LEN, NULL, NULL,
+                          ngx_http_log_connection },
+    { ngx_string("pipe"), 1, NULL, NULL, ngx_http_log_pipe },
+    { ngx_string("time"), sizeof("28/Sep/1970:12:00:00 +0600") - 1,
+                          NULL, NULL, ngx_http_log_time },
+    { ngx_string("msec"), NGX_TIME_T_LEN + 4, NULL, NULL, ngx_http_log_msec },
+    { ngx_string("request_time"), NGX_TIME_T_LEN, NULL, NULL,
+                          ngx_http_log_request_time },
+    { ngx_string("status"), 3, NULL, NULL, ngx_http_log_status },
+    { ngx_string("length"), NGX_OFF_T_LEN, NULL, NULL, ngx_http_log_length },
+    { ngx_string("apache_length"), NGX_OFF_T_LEN,
+                          NULL, NULL, ngx_http_log_apache_length },
+    { ngx_string("request_length"), NGX_SIZE_T_LEN,
+                          NULL, NULL, ngx_http_log_request_length },
+
+    { ngx_string("request"), 0, NULL,
+                          ngx_http_log_request_getlen,
+                          ngx_http_log_request },
+
+    { ngx_string("i"), 0, ngx_http_log_header_in_compile, NULL,
+                          ngx_http_log_header_in },
+    { ngx_string("o"), 0, ngx_http_log_header_out_compile, NULL,
+                          ngx_http_log_header_out },
+    { ngx_string("v"), 0, ngx_http_log_variable_compile, NULL,
+                          ngx_http_log_variable },
+
+    { ngx_null_string, 0, NULL, NULL, NULL }
+};
+
+
+ngx_int_t
+ngx_http_log_handler(ngx_http_request_t *r)
+{
+    ngx_uint_t                i, l;
+    u_char                   *line, *p;
+    size_t                    len;
+    ngx_http_log_t           *log;
+    ngx_http_log_op_t        *op;
+    ngx_http_log_loc_conf_t  *lcf;
+#if (NGX_WIN32)
+    u_long                    written;
+#endif
+
+    ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
+                   "http log handler");
+
+    lcf = ngx_http_get_module_loc_conf(r, ngx_http_log_module);
+
+    if (lcf->off) {
+        return NGX_OK;
+    }
+
+    log = lcf->logs->elts;
+    for (l = 0; l < lcf->logs->nelts; l++) {
+
+        len = 0;
+        op = log[l].ops->elts;
+        for (i = 0; i < log[l].ops->nelts; i++) {
+            if (op[i].len == 0) {
+                len += op[i].getlen(r, op[i].data);
+
+            } else {
+                len += op[i].len;
+            }
+        }
+
+#if (NGX_WIN32)
+        len += 2;
+#else
+        len++;
+#endif
+
+        line = ngx_palloc(r->pool, len);
+        if (line == NULL) {
+            return NGX_ERROR;
+        }
+
+        p = line;
+
+        for (i = 0; i < log[l].ops->nelts; i++) {
+            p = op[i].run(r, p, &op[i]);
+        }
+
+#if (NGX_WIN32)
+        *p++ = CR; *p++ = LF;
+        WriteFile(log[l].file->fd, line, p - line, &written, NULL);
+#else
+        *p++ = LF;
+        write(log[l].file->fd, line, p - line);
+#endif
+    }
+
+    return NGX_OK;
+}
+
+
+static u_char *
+ngx_http_log_copy_short(ngx_http_request_t *r, u_char *buf,
+    ngx_http_log_op_t *op)
+{
+    size_t     len;
+    uintptr_t  data;
+
+    len = op->len;
+    data = op->data;
+
+    while (len--) {
+        *buf++ = (u_char) (data & 0xff);
+        data >>= 8;
+    }
+
+    return buf;
+}
+
+
+static u_char *
+ngx_http_log_copy_long(ngx_http_request_t *r, u_char *buf,
+    ngx_http_log_op_t *op)
+{
+    return ngx_cpymem(buf, (u_char *) op->data, op->len);
+}
+
+
+static u_char *
+ngx_http_log_addr(ngx_http_request_t *r, u_char *buf, ngx_http_log_op_t *op)
+{
+    return ngx_cpymem(buf, r->connection->addr_text.data,
+                      r->connection->addr_text.len);
+}
+
+
+static u_char *
+ngx_http_log_connection(ngx_http_request_t *r, u_char *buf,
+    ngx_http_log_op_t *op)
+{
+    return ngx_sprintf(buf, "%ui", r->connection->number);
+}
+
+
+static u_char *
+ngx_http_log_pipe(ngx_http_request_t *r, u_char *buf, ngx_http_log_op_t *op)
+{
+    if (r->pipeline) {
+        *buf = 'p';
+    } else {
+        *buf = '.';
+    }
+
+    return buf + 1;
+}
+
+
+static u_char *
+ngx_http_log_time(ngx_http_request_t *r, u_char *buf, ngx_http_log_op_t *op)
+{
+    return ngx_cpymem(buf, ngx_cached_http_log_time.data,
+                      ngx_cached_http_log_time.len);
+}
+
+
+static u_char *
+ngx_http_log_msec(ngx_http_request_t *r, u_char *buf, ngx_http_log_op_t *op)
+{
+    ngx_time_t  *tp;
+
+    tp = ngx_timeofday();
+
+    return ngx_sprintf(buf, "%T.%03M", tp->sec, tp->msec);
+}
+
+
+static u_char *
+ngx_http_log_request_time(ngx_http_request_t *r, u_char *buf,
+    ngx_http_log_op_t *op)
+{
+    time_t  elapsed;
+
+    elapsed = ngx_time() - r->start_time;
+
+    return ngx_sprintf(buf, "%T", elapsed);
+}
+
+
+static size_t
+ngx_http_log_request_getlen(ngx_http_request_t *r, uintptr_t data)
+{
+    return r->request_line.len;
+}
+
+
+static u_char *
+ngx_http_log_request(ngx_http_request_t *r, u_char *buf, ngx_http_log_op_t *op)
+{
+    return ngx_cpymem(buf, r->request_line.data, r->request_line.len);
+}
+
+
+static u_char *
+ngx_http_log_status(ngx_http_request_t *r, u_char *buf, ngx_http_log_op_t *op)
+{
+    return ngx_sprintf(buf, "%ui",
+                       r->err_status ? r->err_status : r->headers_out.status);
+}
+
+
+static u_char *
+ngx_http_log_length(ngx_http_request_t *r, u_char *buf, ngx_http_log_op_t *op)
+{
+    return ngx_sprintf(buf, "%O", r->connection->sent);
+}
+
+
+static u_char *
+ngx_http_log_apache_length(ngx_http_request_t *r, u_char *buf,
+    ngx_http_log_op_t *op)
+{
+    off_t  length;
+
+    length = r->connection->sent - r->header_size;
+
+    if (length > 0) {
+        return ngx_sprintf(buf, "%O", length);
+    }
+
+    *buf = '0';
+
+    return buf + 1;
+}
+
+
+static u_char *
+ngx_http_log_request_length(ngx_http_request_t *r, u_char *buf,
+    ngx_http_log_op_t *op)
+{
+    return ngx_sprintf(buf, "%z", r->request_length);
+}
+
+
+static ngx_int_t
+ngx_http_log_header_in_compile(ngx_conf_t *cf, ngx_http_log_op_t *op,
+    ngx_str_t *value)
+{
+    ngx_uint_t  i;
+
+    op->len = 0;
+
+    for (i = 0; ngx_http_headers_in[i].name.len != 0; i++) {
+
+        if (ngx_http_headers_in[i].name.len != value->len) {
+            continue;
+        }
+
+        /* STUB: "Cookie" speacial handling */
+        if (ngx_http_headers_in[i].offset == 0) {
+            continue;
+        }
+
+        if (ngx_strncasecmp(ngx_http_headers_in[i].name.data, value->data,
+                            value->len) == 0)
+        {
+            op->getlen = ngx_http_log_header_in_getlen;
+            op->run = ngx_http_log_header_in;
+            op->data = ngx_http_headers_in[i].offset;
+
+            return NGX_OK;
+        }
+    }
+
+    op->getlen = ngx_http_log_unknown_header_in_getlen;
+    op->run = ngx_http_log_unknown_header_in;
+    op->data = (uintptr_t) value;
+
+    return NGX_OK;
+}
+
+
+static size_t
+ngx_http_log_header_in_getlen(ngx_http_request_t *r, uintptr_t data)
+{
+    ngx_table_elt_t  *h;
+
+    h = *(ngx_table_elt_t **) ((char *) &r->headers_in + data);
+
+    if (h) {
+        return h->value.len;
+    }
+
+    return 1;
+}
+
+
+static u_char *
+ngx_http_log_header_in(ngx_http_request_t *r, u_char *buf,
+    ngx_http_log_op_t *op)
+{
+    ngx_table_elt_t  *h;
+
+    h = *(ngx_table_elt_t **) ((char *) &r->headers_in + op->data);
+
+    if (h) {
+        return ngx_cpymem(buf, h->value.data, h->value.len);
+    }
+
+    *buf = '-';
+
+    return buf + 1;
+}
+
+
+static size_t
+ngx_http_log_unknown_header_in_getlen(ngx_http_request_t *r, uintptr_t data)
+{
+    ngx_table_elt_t  *h;
+
+    h = ngx_http_log_unknown_header(&r->headers_in.headers, (ngx_str_t *) data);
+
+    if (h) {
+        return h->value.len;
+    }
+
+    return 1;
+}
+
+
+static u_char *
+ngx_http_log_unknown_header_in(ngx_http_request_t *r, u_char *buf,
+    ngx_http_log_op_t *op)
+{
+    ngx_table_elt_t  *h;
+
+    h = ngx_http_log_unknown_header(&r->headers_in.headers,
+                                    (ngx_str_t *) op->data);
+
+    if (h) {
+        return ngx_cpymem(buf, h->value.data, h->value.len);
+    }
+
+    *buf = '-';
+
+    return buf + 1;
+}
+
+
+static ngx_int_t
+ngx_http_log_header_out_compile(ngx_conf_t *cf, ngx_http_log_op_t *op,
+    ngx_str_t *value)
+{
+    ngx_uint_t  i;
+
+    op->len = 0;
+
+    for (i = 0; ngx_http_headers_out[i].name.len != 0; i++) {
+
+        if (ngx_http_headers_out[i].name.len != value->len) {
+            continue;
+        }
+
+        if (ngx_strncasecmp(ngx_http_headers_out[i].name.data, value->data,
+                            value->len) == 0)
+        {
+            op->getlen = ngx_http_log_header_out_getlen;
+            op->run = ngx_http_log_header_out;
+            op->data = ngx_http_headers_out[i].offset;
+
+            return NGX_OK;
+        }
+    }
+
+    if (value->len == sizeof("Connection") - 1
+        && ngx_strncasecmp(value->data, "Connection", value->len) == 0)
+    {
+        op->len = sizeof("keep-alive") - 1;
+        op->getlen = NULL;
+        op->run = ngx_http_log_connection_header_out;
+        op->data = 0;
+        return NGX_OK;
+    }
+
+    if (value->len == sizeof("Transfer-Encoding") - 1
+        && ngx_strncasecmp(value->data, "Transfer-Encoding", value->len) == 0)
+    {
+        op->len = sizeof("chunked") - 1;
+        op->getlen = NULL;
+        op->run = ngx_http_log_transfer_encoding_header_out;
+        op->data = 0;
+        return NGX_OK;
+    }
+
+    op->getlen = ngx_http_log_unknown_header_out_getlen;
+    op->run = ngx_http_log_unknown_header_out;
+    op->data = (uintptr_t) value;
+
+    return NGX_OK;
+}
+
+
+static size_t
+ngx_http_log_header_out_getlen(ngx_http_request_t *r, uintptr_t data)
+{
+    ngx_table_elt_t  *h;
+
+    h = *(ngx_table_elt_t **) ((char *) &r->headers_out + data);
+
+    if (h) {
+        return h->value.len;
+    }
+
+    /*
+     * No header pointer was found.
+     * However, some headers: "Date", "Server", "Content-Length",
+     * and "Last-Modified" have a special handling in the header filter,
+     * but we do not set up their pointers in the filter,
+     * because they are too seldom needed to be logged.
+     */
+
+    if (data == offsetof(ngx_http_headers_out_t, date)) {
+        return ngx_cached_http_time.len;
+    }
+
+    if (data == offsetof(ngx_http_headers_out_t, server)) {
+        return (sizeof(NGINX_VER) - 1);
+    }
+
+    if (data == offsetof(ngx_http_headers_out_t, content_length)) {
+        if (r->headers_out.content_length_n == -1) {
+            return 1;
+        }
+
+        return NGX_OFF_T_LEN;
+    }
+
+    if (data == offsetof(ngx_http_headers_out_t, last_modified)) {
+        if (r->headers_out.last_modified_time == -1) {
+            return 1;
+        }
+
+        return sizeof("Mon, 28 Sep 1970 06:00:00 GMT") - 1;
+    }
+
+    return 1;
+}
+
+
+static u_char *
+ngx_http_log_header_out(ngx_http_request_t *r, u_char *buf,
+    ngx_http_log_op_t *op)
+{
+    ngx_table_elt_t  *h;
+
+    h = *(ngx_table_elt_t **) ((char *) &r->headers_out + op->data);
+
+    if (h) {
+        return ngx_cpymem(buf, h->value.data, h->value.len);
+    }
+
+    /*
+     * No header pointer was found.
+     * However, some headers: "Date", "Server", "Content-Length",
+     * and "Last-Modified" have a special handling in the header filter,
+     * but we do not set up their pointers in the filter,
+     * because they are too seldom needed to be logged.
+     */
+
+    if (op->data == offsetof(ngx_http_headers_out_t, date)) {
+        return ngx_cpymem(buf, ngx_cached_http_time.data,
+                          ngx_cached_http_time.len);
+    }
+
+    if (op->data == offsetof(ngx_http_headers_out_t, server)) {
+        return ngx_cpymem(buf, NGINX_VER, sizeof(NGINX_VER) - 1);
+    }
+
+    if (op->data == offsetof(ngx_http_headers_out_t, content_length)) {
+        if (r->headers_out.content_length_n == -1) {
+            *buf = '-';
+
+            return buf + 1;
+        }
+
+        return ngx_sprintf(buf, "%O", r->headers_out.content_length_n);
+    }
+
+    if (op->data == offsetof(ngx_http_headers_out_t, last_modified)) {
+        if (r->headers_out.last_modified_time == -1) {
+            *buf = '-';
+
+            return buf + 1;
+        }
+
+        return ngx_http_time(buf, r->headers_out.last_modified_time);
+    }
+
+    *buf = '-';
+
+    return buf + 1;
+}
+
+
+static size_t
+ngx_http_log_unknown_header_out_getlen(ngx_http_request_t *r, uintptr_t data)
+{
+    ngx_table_elt_t  *h;
+
+    h = ngx_http_log_unknown_header(&r->headers_out.headers,
+                                    (ngx_str_t *) data);
+
+    if (h) {
+        return h->value.len;
+    }
+
+    return 1;
+}
+
+
+static u_char *
+ngx_http_log_unknown_header_out(ngx_http_request_t *r, u_char *buf,
+    ngx_http_log_op_t *op)
+{
+    ngx_table_elt_t  *h;
+
+    h = ngx_http_log_unknown_header(&r->headers_out.headers,
+                                    (ngx_str_t *) op->data);
+
+    if (h) {
+        return ngx_cpymem(buf, h->value.data, h->value.len);
+    }
+
+    *buf = '-';
+
+    return buf + 1;
+}
+
+
+static ngx_table_elt_t *
+ngx_http_log_unknown_header(ngx_list_t *headers, ngx_str_t *value)
+{
+    ngx_uint_t        i;
+    ngx_list_part_t  *part;
+    ngx_table_elt_t  *h;
+
+    part = &headers->part;
+    h = part->elts;
+
+    for (i = 0; /* void */; i++) {
+
+        if (i >= part->nelts) {
+            if (part->next == NULL) {
+                break;
+            }
+
+            part = part->next;
+            h = part->elts;
+            i = 0;
+        }
+
+        if (h[i].key.len != value->len) {
+            continue;
+        }
+
+        if (ngx_strncasecmp(h[i].key.data, value->data, value->len) == 0) {
+            return &h[i];
+        }
+    }
+
+    return NULL;
+}
+
+
+static u_char *
+ngx_http_log_connection_header_out(ngx_http_request_t *r, u_char *buf,
+    ngx_http_log_op_t *op)
+{
+    if (r->keepalive) {
+        return ngx_cpymem(buf, "keep-alive", sizeof("keep-alive") - 1);
+
+    } else {
+        return ngx_cpymem(buf, "close", sizeof("close") - 1);
+    }
+}
+
+
+static u_char *
+ngx_http_log_transfer_encoding_header_out(ngx_http_request_t *r, u_char *buf,
+    ngx_http_log_op_t *op)
+{
+    if (r->chunked) {
+        return ngx_cpymem(buf, "chunked", sizeof("chunked") - 1);
+    }
+
+    *buf = '-';
+
+    return buf + 1;
+}
+
+
+static ngx_int_t 
+ngx_http_log_variable_compile(ngx_conf_t *cf, ngx_http_log_op_t *op,
+    ngx_str_t *value)
+{
+    ngx_int_t  index;
+
+    index = ngx_http_get_variable_index(cf, value);
+    if (index == NGX_ERROR) {
+        return NGX_ERROR;
+    }
+
+    op->len = 0;
+    op->getlen = ngx_http_log_variable_getlen;
+    op->run = ngx_http_log_variable;
+    op->data = index;
+
+    return NGX_OK;
+}
+
+
+static size_t
+ngx_http_log_variable_getlen(ngx_http_request_t *r, uintptr_t data)
+{
+    ngx_http_variable_value_t  *value;
+
+    value = ngx_http_get_indexed_variable(r, data);
+
+    if (value == NULL
+        || value == NGX_HTTP_VAR_NOT_FOUND
+        || value->text.len == 0)
+    {
+        return 1;
+    }
+
+    return value->text.len;
+}
+
+
+static u_char *
+ngx_http_log_variable(ngx_http_request_t *r, u_char *buf, ngx_http_log_op_t *op)
+{
+    ngx_http_variable_value_t  *value;
+
+    value = ngx_http_get_indexed_variable(r, op->data);
+
+    if (value == NULL
+        || value == NGX_HTTP_VAR_NOT_FOUND
+        || value->text.len == 0)
+    {
+        *buf = '-';
+        return buf + 1;
+    }
+
+    return ngx_cpymem(buf, value->text.data, value->text.len);
+}
+
+
+static ngx_int_t
+ngx_http_log_set_formats(ngx_conf_t *cf)
+{
+    ngx_http_log_op_name_t  *op;
+
+    for (op = ngx_http_log_fmt_ops; op->name.len; op++) { /* void */ }
+    op->run = NULL;
+
+    return NGX_OK;
+}
+
+
+static void *
+ngx_http_log_create_main_conf(ngx_conf_t *cf)
+{
+    ngx_http_log_main_conf_t  *conf;
+
+    char       *rc;
+    ngx_str_t  *value;
+
+    conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_log_main_conf_t));
+    if (conf == NULL) {
+        return NGX_CONF_ERROR;
+    }
+
+    if (ngx_array_init(&conf->formats, cf->pool, 4, sizeof(ngx_http_log_fmt_t))
+        == NGX_ERROR)
+    {
+        return NGX_CONF_ERROR;
+    }
+
+    cf->args->nelts = 0;
+
+    value = ngx_array_push(cf->args);
+    if (value == NULL) {
+        return NGX_CONF_ERROR;
+    }
+
+    value->len = 0;
+    value->data = NULL;
+
+    value = ngx_array_push(cf->args);
+    if (value == NULL) {
+        return NGX_CONF_ERROR;
+    }
+
+    value->len = sizeof("combined") - 1;
+    value->data = (u_char *) "combined";
+
+    value = ngx_array_push(cf->args);
+    if (value == NULL) {
+        return NGX_CONF_ERROR;
+    }
+
+    *value = ngx_http_combined_fmt;
+
+    rc = ngx_http_log_set_format(cf, NULL, conf);
+    if (rc != NGX_CONF_OK) {
+        return NGX_CONF_ERROR;
+    }
+
+    return conf;
+}
+
+
+static void *
+ngx_http_log_create_loc_conf(ngx_conf_t *cf)
+{
+    ngx_http_log_loc_conf_t  *conf;
+
+    conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_log_loc_conf_t));
+    if (conf == NULL) {
+        return NGX_CONF_ERROR;
+    }
+
+    return conf;
+}
+
+
+static char *
+ngx_http_log_merge_loc_conf(ngx_conf_t *cf, void *parent, void *child)
+{
+    ngx_http_log_loc_conf_t *prev = parent;
+    ngx_http_log_loc_conf_t *conf = child;
+
+    ngx_http_log_t            *log;
+    ngx_http_log_fmt_t        *fmt;
+    ngx_http_log_main_conf_t  *lmcf;
+
+    if (conf->logs == NULL) {
+
+        if (conf->off) {
+            return NGX_CONF_OK;
+        }
+
+        if (prev->logs) {
+            conf->logs = prev->logs;
+
+        } else {
+
+            if (prev->off) {
+                conf->off = prev->off;
+                return NGX_CONF_OK;
+            }
+
+            conf->logs = ngx_array_create(cf->pool, 2, sizeof(ngx_http_log_t));
+            if (conf->logs == NULL) {
+                return NGX_CONF_ERROR;
+            }
+
+            log = ngx_array_push(conf->logs);
+            if (log == NULL) {
+                return NGX_CONF_ERROR;
+            }
+
+            log->file = ngx_conf_open_file(cf->cycle, &http_access_log);
+            if (log->file == NULL) {
+                return NGX_CONF_ERROR;
+            }
+
+            lmcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_log_module);
+            fmt = lmcf->formats.elts;
+
+            /* the default "combined" format */
+            log->ops = fmt[0].ops;
+        }
+    }
+
+    return NGX_CONF_OK;
+}
+
+
+static char *
+ngx_http_log_set_log(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
+{
+    ngx_http_log_loc_conf_t *llcf = conf;
+
+    ngx_uint_t                 i;
+    ngx_str_t                 *value, name;
+    ngx_http_log_t            *log;
+    ngx_http_log_fmt_t        *fmt;
+    ngx_http_log_main_conf_t  *lmcf;
+
+    value = cf->args->elts;
+
+    if (ngx_strcmp(value[1].data, "off") == 0) {
+        llcf->off = 1;
+        return NGX_CONF_OK;
+    }
+
+    if (llcf->logs == NULL) {
+        llcf->logs = ngx_array_create(cf->pool, 2, sizeof(ngx_http_log_t));
+        if (llcf->logs == NULL) {
+            return NGX_CONF_ERROR;
+        }
+    }
+
+    lmcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_log_module);
+
+    log = ngx_array_push(llcf->logs);
+    if (log == NULL) {
+        return NGX_CONF_ERROR;
+    }
+
+    log->file = ngx_conf_open_file(cf->cycle, &value[1]);
+    if (log->file == NULL) {
+        return NGX_CONF_ERROR;
+    }
+
+    if (cf->args->nelts == 3) {
+        name = value[2];
+    } else {
+        name.len = sizeof("combined") - 1;
+        name.data = (u_char *) "combined";
+    }
+
+    fmt = lmcf->formats.elts;
+    for (i = 0; i < lmcf->formats.nelts; i++) {
+        if (fmt[i].name.len == name.len
+            && ngx_strcasecmp(fmt[i].name.data, name.data) == 0)
+        {
+            log->ops = fmt[i].ops;
+            return NGX_CONF_OK;
+        }
+    }
+
+    ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
+                       "unknown log format \"%V\"", &name);
+
+    return NGX_CONF_ERROR;
+}
+
+
+static char *
+ngx_http_log_set_format(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
+{
+    ngx_http_log_main_conf_t *lmcf = conf;
+
+    u_char                     *data, *p, *fname, ch;
+    size_t                      i, len, fname_len;
+    ngx_str_t                  *value, var, arg, *a;
+    ngx_uint_t                  s, f, bracket;
+    ngx_http_log_op_t          *op;
+    ngx_http_log_fmt_t         *fmt;
+    ngx_http_log_op_name_t     *name;
+
+    value = cf->args->elts;
+
+    fmt = lmcf->formats.elts;
+    for (f = 0; f < lmcf->formats.nelts; f++) {
+        if (fmt[f].name.len == value[1].len
+            && ngx_strcmp(fmt->name.data, value[1].data) == 0)
+        {
+            return "duplicate \"log_format\" name";
+        }
+    }
+
+    fmt = ngx_array_push(&lmcf->formats);
+    if (fmt == NULL) {
+        return NGX_CONF_ERROR;
+    }
+
+    fmt->name = value[1];
+
+    fmt->ops = ngx_array_create(cf->pool, 20, sizeof(ngx_http_log_op_t));
+    if (fmt->ops == NULL) {
+        return NGX_CONF_ERROR;
+    }
+
+    arg.data = NULL;
+
+    for (s = 2; s < cf->args->nelts; s++) {
+
+        i = 0;
+
+        while (i < value[s].len) {
+
+            op = ngx_array_push(fmt->ops);
+            if (op == NULL) {
+                return NGX_CONF_ERROR;
+            }
+
+            data = &value[s].data[i];
+
+            if (value[s].data[i] == '%') {
+                i++;
+
+                if (i == value[s].len) {
+                    goto invalid;
+                }
+
+                if (value[s].data[i] == '{') {
+                    i++;
+
+                    arg.data = &value[s].data[i];
+
+                    while (i < value[s].len && value[s].data[i] != '}') {
+                        i++;
+                    }
+
+                    arg.len = &value[s].data[i] - arg.data;
+
+                    if (i == value[s].len || arg.len == 0) {
+                        goto invalid;
+                    }
+
+                    i++;
+
+                } else {
+                    arg.len = 0;
+                }
+
+                fname = &value[s].data[i];
+
+                while (i < value[s].len
+                       && ((value[s].data[i] >= 'a' && value[s].data[i] <= 'z')
+                           || value[s].data[i] == '_'))
+                {
+                    i++;
+                }
+
+                fname_len = &value[s].data[i] - fname;
+
+                if (fname_len == 0) {
+                    goto invalid;
+                }
+
+                for (name = ngx_http_log_fmt_ops; name->run; name++) {
+                    if (name->name.len == 0) {
+                        name = (ngx_http_log_op_name_t *) name->run;
+                    }
+
+                    if (name->name.len == fname_len
+                        && ngx_strncmp(name->name.data, fname, fname_len) == 0)
+                    {
+                        if (name->compile == NULL) {
+                            if (arg.len) {
+                                fname[fname_len] = '\0';
+                                ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
+                                               "\"%s\" must not have argument",
+                                               data);
+                                return NGX_CONF_ERROR;
+                            }
+
+                            op->len = name->len;
+                            op->getlen = name->getlen;
+                            op->run = name->run;
+                            op->data = 0;
+
+                            break;
+                        }
+
+                        if (arg.len == 0) {
+                            fname[fname_len] = '\0';
+                            ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
+                                               "\"%s\" requires argument", 
+                                               data);
+                            return NGX_CONF_ERROR;
+                        }
+
+                        a = ngx_palloc(cf->pool, sizeof(ngx_str_t));
+                        if (a == NULL) {
+                            return NGX_CONF_ERROR;
+                        }
+
+                        *a = arg;
+                        if (name->compile(cf, op, a) == NGX_ERROR) {
+                            return NGX_CONF_ERROR;
+                        }
+
+                        break;
+                    }
+                }
+
+                if (name->name.len == 0) {
+                    goto invalid;
+                }
+
+            } else if (value[s].data[i] == '$') {
+
+                if (++i == value[s].len) {
+                    goto invalid;
+                }
+
+                if (value[s].data[i] == '{') {
+                    bracket = 1;
+
+                    if (++i == value[s].len) {
+                        goto invalid;
+                    }
+
+                    var.data = &value[s].data[i];
+
+                } else {
+                    bracket = 0;
+                    var.data = &value[s].data[i];
+                }
+
+                for (var.len = 0; i < value[s].len; i++, var.len++) {
+                    ch = value[s].data[i];
+
+                    if (ch == '}' && bracket) {
+                        i++;
+                        bracket = 0;
+                        break;
+                    }
+
+                    if ((ch >= 'A' && ch <= 'Z')
+                        || (ch >= 'a' && ch <= 'z')
+                        || (ch >= '0' && ch <= '9')
+                        || ch == '_')
+                    {
+                        continue;
+                    }
+
+                    break;
+                }
+
+                if (bracket) {
+                    ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
+                                       "the closing bracket in \"%V\" "
+                                       "variable is missing", &var);
+                    return NGX_CONF_ERROR;
+                }
+
+                if (var.len == 0) {
+                    goto invalid;
+                }
+
+                if (ngx_http_log_variable_compile(cf, op, &var) != NGX_OK) {
+                    return NGX_CONF_ERROR;
+                }
+
+            } else {
+                i++;
+
+                while (i < value[s].len
+                       && value[s].data[i] != '$'
+                       && value[s].data[i] != '%')
+                {
+                    i++;
+                }
+
+                len = &value[s].data[i] - data;
+
+                if (len) {
+
+                    op->len = len;
+                    op->getlen = NULL;
+
+                    if (len <= sizeof(uintptr_t)) {
+                        op->run = ngx_http_log_copy_short;
+                        op->data = 0;
+
+                        while (len--) {
+                            op->data <<= 8;
+                            op->data |= data[len];
+                        }
+
+                    } else {
+                        op->run = ngx_http_log_copy_long;
+
+                        p = ngx_palloc(cf->pool, len);
+                        if (p == NULL) {
+                            return NGX_CONF_ERROR;
+                        }
+
+                        ngx_memcpy(p, data, len);
+                        op->data = (uintptr_t) p;
+                    }
+                }
+            }
+        }
+    }
+
+    return NGX_CONF_OK;
+
+invalid:
+
+    ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "invalid parameter \"%s\"", data);
+
+    return NGX_CONF_ERROR;
+}
+
+
+static ngx_int_t
+ngx_http_log_init(ngx_cycle_t *cycle)
+{
+    ngx_http_core_main_conf_t  *cmcf;
+
+    cmcf = ngx_http_cycle_get_module_main_conf(cycle, ngx_http_core_module);
+
+    cmcf->log_handler = ngx_http_log_handler;
+
+    return NGX_OK;
+}