new file mode 100644
--- /dev/null
+++ b/src/http/ngx_http_log_handler.c
@@ -0,0 +1,978 @@
+
+/*
+ * 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,
+                                 uintptr_t data);
+static u_char *ngx_http_log_connection(ngx_http_request_t *r, u_char *buf,
+                                       uintptr_t data);
+static u_char *ngx_http_log_pipe(ngx_http_request_t *r, u_char *buf,
+                                 uintptr_t data);
+static u_char *ngx_http_log_time(ngx_http_request_t *r, u_char *buf,
+                                 uintptr_t data);
+static u_char *ngx_http_log_msec(ngx_http_request_t *r, u_char *buf,
+                                 uintptr_t data);
+static u_char *ngx_http_log_request(ngx_http_request_t *r, u_char *buf,
+                                    uintptr_t data);
+static u_char *ngx_http_log_status(ngx_http_request_t *r, u_char *buf,
+                                   uintptr_t data);
+static u_char *ngx_http_log_length(ngx_http_request_t *r, u_char *buf,
+                                   uintptr_t data);
+static u_char *ngx_http_log_apache_length(ngx_http_request_t *r, u_char *buf,
+                                          uintptr_t data);
+static u_char *ngx_http_log_header_in(ngx_http_request_t *r, u_char *buf,
+                                      uintptr_t data);
+static u_char *ngx_http_log_connection_header_out(ngx_http_request_t *r,
+                                                  u_char *buf, uintptr_t data);
+static u_char *ngx_http_log_transfer_encoding_header_out(ngx_http_request_t *r,
+                                                         u_char *buf,
+                                                         uintptr_t data);
+static u_char *ngx_http_log_unknown_header_in(ngx_http_request_t *r,
+                                              u_char *buf, uintptr_t data);
+static u_char *ngx_http_log_header_out(ngx_http_request_t *r, u_char *buf,
+                                       uintptr_t data);
+static u_char *ngx_http_log_unknown_header_out(ngx_http_request_t *r, u_char *buf,
+                                               uintptr_t data);
+
+static ngx_int_t ngx_http_log_pre_conf(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_parse_format(ngx_conf_t *cf, ngx_array_t *ops,
+                                           ngx_str_t *line);
+
+
+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_pre_conf,                 /* pre conf */
+
+    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,
+    &ngx_http_log_module_ctx,              /* module context */
+    ngx_http_log_commands,                 /* module directives */
+    NGX_HTTP_MODULE,                       /* module type */
+    NULL,                                  /* init module */
+    NULL                                   /* init child */
+};
+
+
+static ngx_str_t http_access_log = ngx_string(NGX_HTTP_LOG_PATH);
+
+
+static ngx_str_t ngx_http_combined_fmt =
+    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, ngx_http_log_addr },
+    { ngx_string("conn"), NGX_INT32_LEN, ngx_http_log_connection },
+    { ngx_string("pipe"), 1, ngx_http_log_pipe },
+    { ngx_string("time"), sizeof("28/Sep/1970:12:00:00") - 1,
+                          ngx_http_log_time },
+    { ngx_string("msec"), TIME_T_LEN + 4, ngx_http_log_msec },
+    { ngx_string("request"), 0, ngx_http_log_request },
+    { ngx_string("status"), 3, ngx_http_log_status },
+    { ngx_string("length"), NGX_OFF_T_LEN, ngx_http_log_length },
+    { ngx_string("apache_length"), NGX_OFF_T_LEN, ngx_http_log_apache_length },
+    { ngx_string("i"), NGX_HTTP_LOG_ARG, ngx_http_log_header_in },
+    { ngx_string("o"), NGX_HTTP_LOG_ARG, ngx_http_log_header_out },
+    { ngx_null_string, 0, NULL }
+};
+
+
+ngx_int_t ngx_http_log_handler(ngx_http_request_t *r)
+{
+    ngx_uint_t                i, l;
+    uintptr_t                 data;
+    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 (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 += (size_t) op[i].op(r, NULL, op[i].data);
+
+            } else {
+                len += op[i].len;
+            }
+        }
+
+#if (WIN32)
+        len += 2;
+#else
+        len++;
+#endif
+
+        ngx_test_null(line, ngx_palloc(r->pool, len), NGX_ERROR);
+        p = line;
+
+        for (i = 0; i < log[l].ops->nelts; i++) {
+            if (op[i].op == NGX_HTTP_LOG_COPY_SHORT) {
+                len = op[i].len;
+                data = op[i].data;
+                while (len--) {
+                    *p++ = (char) (data & 0xff);
+                    data >>= 8;
+                }
+
+            } else if (op[i].op == NGX_HTTP_LOG_COPY_LONG) {
+                p = ngx_cpymem(p, (void *) op[i].data, op[i].len);
+
+            } else {
+                p = op[i].op(r, p, op[i].data);
+            }
+        }
+
+#if (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_addr(ngx_http_request_t *r, u_char *buf,
+                                 uintptr_t data)
+{
+    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,
+                                     uintptr_t data)
+{
+    return buf + ngx_snprintf((char *) buf, NGX_INT_T_LEN + 1,
+                              "%" NGX_UINT_T_FMT,
+                              r->connection->number);
+}
+
+
+static u_char *ngx_http_log_pipe(ngx_http_request_t *r, u_char *buf,
+                                 uintptr_t data)
+{
+    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,
+                                 uintptr_t data)
+{
+    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,
+                                 uintptr_t data)
+{
+    struct timeval  tv;
+
+    ngx_gettimeofday(&tv);
+
+    return buf + ngx_snprintf((char *) buf, TIME_T_LEN + 5, "%ld.%03ld",
+                              tv.tv_sec, tv.tv_usec / 1000);
+}
+
+
+static u_char *ngx_http_log_request(ngx_http_request_t *r, u_char *buf,
+                                    uintptr_t data)
+{
+    if (buf == NULL) {
+        /* find the request line length */
+        return (u_char *) r->request_line.len;
+    }
+
+    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,
+                                   uintptr_t data)
+{
+    return buf + ngx_snprintf((char *) buf, 4, "%" NGX_UINT_T_FMT,
+                        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,
+                                   uintptr_t data)
+{
+    return buf + ngx_snprintf((char *) buf, NGX_OFF_T_LEN + 1, OFF_T_FMT,
+                              r->connection->sent);
+}
+
+
+static u_char *ngx_http_log_apache_length(ngx_http_request_t *r, u_char *buf,
+                                          uintptr_t data)
+{
+    return buf + ngx_snprintf((char *) buf, NGX_OFF_T_LEN + 1, OFF_T_FMT,
+                              r->connection->sent - r->header_size);
+}
+
+
+static u_char *ngx_http_log_header_in(ngx_http_request_t *r, u_char *buf,
+                                      uintptr_t data)
+{
+    ngx_uint_t          i;
+    ngx_str_t          *s;
+    ngx_table_elt_t    *h;
+    ngx_http_log_op_t  *op;
+
+    if (r) {
+        h = *(ngx_table_elt_t **) ((char *) &r->headers_in + data);
+
+        if (h == NULL) {
+
+            /* no header */
+
+            if (buf) {
+                *buf = '-';
+            }
+
+            return buf + 1;
+        }
+
+        if (buf == NULL) {
+            /* find the header length */
+            return (u_char *) h->value.len;
+        }
+
+        return ngx_cpymem(buf, h->value.data, h->value.len);
+    }
+
+    /* find an offset while a format string compilation */
+
+    op = (ngx_http_log_op_t *) buf;
+    s = (ngx_str_t *) data;
+
+    op->len = 0;
+
+    for (i = 0; ngx_http_headers_in[i].name.len != 0; i++) {
+        if (ngx_http_headers_in[i].name.len != s->len) {
+            continue;
+        }
+
+        if (ngx_strncasecmp(ngx_http_headers_in[i].name.data, s->data, s->len)
+                                                                          == 0)
+        {
+            op->op = ngx_http_log_header_in;
+            op->data = ngx_http_headers_in[i].offset;
+            return NULL;
+        }
+    }
+
+    op->op = ngx_http_log_unknown_header_in;
+    op->data = (uintptr_t) s;
+
+    return NULL;
+}
+
+
+static u_char *ngx_http_log_unknown_header_in(ngx_http_request_t *r,
+                                              u_char *buf, uintptr_t data)
+{
+    ngx_uint_t        i;
+    ngx_str_t        *s;
+    ngx_list_part_t  *part;
+    ngx_table_elt_t  *h;
+
+    s = (ngx_str_t *) data;
+
+    part = &r->headers_in.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 != s->len) {
+            continue;
+        }
+
+        if (ngx_strncasecmp(h[i].key.data, s->data, s->len) == 0) {
+            if (buf == NULL) {
+                /* find the header length */
+                return (u_char *) h[i].value.len;
+            }
+
+            return ngx_cpymem(buf, h[i].value.data, h[i].value.len);
+        }
+    }
+
+    /* no header */
+
+    if (buf) {
+        *buf = '-';
+    }
+
+    return buf + 1;
+}
+
+
+static u_char *ngx_http_log_header_out(ngx_http_request_t *r, u_char *buf,
+                                       uintptr_t data)
+{
+    ngx_uint_t          i;
+    ngx_str_t          *s;
+    ngx_table_elt_t    *h;
+    ngx_http_log_op_t  *op;
+
+    if (r) {
+
+        /* run-time execution */
+
+        if (r->http_version < NGX_HTTP_VERSION_10) {
+            if (buf) {
+                *buf = '-';
+            }
+
+            return buf + 1;
+        }
+
+        h = *(ngx_table_elt_t **) ((char *) &r->headers_out + data);
+
+        if (h == NULL) {
+
+            /*
+             * 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)) {
+                if (buf == NULL) {
+                    return (u_char *) ngx_cached_http_time.len;
+                }
+                return ngx_cpymem(buf, ngx_cached_http_time.data,
+                                  ngx_cached_http_time.len);
+            }
+
+            if (data == offsetof(ngx_http_headers_out_t, server)) {
+                if (buf == NULL) {
+                    return (u_char *) (sizeof(NGINX_VER) - 1);
+                }
+                return ngx_cpymem(buf, NGINX_VER, sizeof(NGINX_VER) - 1);
+            }
+
+            if (data == offsetof(ngx_http_headers_out_t, content_length)) {
+                if (r->headers_out.content_length_n == -1) {
+                    if (buf) {
+                        *buf = '-';
+                    }
+                    return buf + 1;
+                }
+
+                if (buf == NULL) {
+                    return (u_char *) NGX_OFF_T_LEN;
+                }
+                return buf + ngx_snprintf((char *) buf,
+                                          NGX_OFF_T_LEN + 2, OFF_T_FMT,
+                                          r->headers_out.content_length_n);
+            }
+
+            if (data == offsetof(ngx_http_headers_out_t, last_modified)) {
+                if (r->headers_out.last_modified_time == -1) {
+                    if (buf) {
+                        *buf = '-';
+                    }
+                    return buf + 1;
+                }
+
+                if (buf == NULL) {
+                    return (u_char *)
+                                   sizeof("Mon, 28 Sep 1970 06:00:00 GMT") - 1;
+                }
+                return buf + ngx_http_time(buf,
+                                           r->headers_out.last_modified_time);
+            }
+
+            if (buf) {
+                *buf = '-';
+            }
+
+            return buf + 1;
+        }
+
+        if (buf == NULL) {
+            /* find the header length */
+            return (u_char *) h->value.len;
+        }
+
+        return ngx_cpymem(buf, h->value.data, h->value.len);
+    }
+
+    /* find an offset while a format string compilation */
+
+    op = (ngx_http_log_op_t *) buf;
+    s = (ngx_str_t *) data;
+
+    op->len = 0;
+
+    for (i = 0; ngx_http_headers_out[i].name.len != 0; i++) {
+        if (ngx_http_headers_out[i].name.len != s->len) {
+            continue;
+        }
+
+        if (ngx_strncasecmp(ngx_http_headers_out[i].name.data, s->data, s->len)
+                                                                          == 0)
+        {
+            op->op = ngx_http_log_header_out;
+            op->data = ngx_http_headers_out[i].offset;
+            return NULL;
+        }
+    }
+
+    if (s->len == sizeof("Connection") - 1
+        && ngx_strncasecmp(s->data, "Connection", s->len) == 0)
+    {
+        op->op = ngx_http_log_connection_header_out;
+        op->data = (uintptr_t) NULL;
+        return NULL;
+    }
+
+    if (s->len == sizeof("Transfer-Encoding") - 1
+        && ngx_strncasecmp(s->data, "Transfer-Encoding", s->len) == 0) {
+        op->op = ngx_http_log_transfer_encoding_header_out;
+        op->data = (uintptr_t) NULL;
+        return NULL;
+    }
+
+    op->op = ngx_http_log_unknown_header_out;
+    op->data = (uintptr_t) s;
+
+    return NULL;
+}
+
+
+static u_char *ngx_http_log_connection_header_out(ngx_http_request_t *r,
+                                                  u_char *buf, uintptr_t data)
+{
+    if (buf == NULL) {
+        return (u_char *) ((r->keepalive) ? sizeof("keep-alive") - 1:
+                                            sizeof("close") - 1);
+    }
+
+    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,
+                                                         uintptr_t data)
+{
+    if (buf == NULL) {
+        return (u_char *) ((r->chunked) ? sizeof("chunked") - 1 : 1);
+    }
+
+    if (r->chunked) {
+        return ngx_cpymem(buf, "chunked", sizeof("chunked") - 1);
+    }
+
+    *buf = '-';
+
+    return buf + 1;
+}
+
+
+static u_char *ngx_http_log_unknown_header_out(ngx_http_request_t *r,
+                                               u_char *buf,
+                                               uintptr_t data)
+{
+    ngx_uint_t        i;
+    ngx_str_t        *s;
+    ngx_list_part_t  *part;
+    ngx_table_elt_t  *h;
+
+    s = (ngx_str_t *) data;
+
+    part = &r->headers_out.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 != s->len) {
+            continue;
+        }
+
+        if (ngx_strncasecmp(h[i].key.data, s->data, s->len) == 0) {
+            if (buf == NULL) {
+                /* find the header length */
+                return (u_char *) h[i].value.len;
+            }
+
+            return ngx_cpymem(buf, h[i].value.data, h[i].value.len);
+        }
+    }
+
+    /* no header */
+
+    if (buf) {
+        *buf = '-';
+    }
+
+    return buf + 1;
+}
+
+
+static ngx_int_t ngx_http_log_pre_conf(ngx_conf_t *cf)
+{
+    ngx_http_log_op_name_t  *op;
+
+    for (op = ngx_http_log_fmt_ops; op->name.len; op++) { /* void */ }
+    op->op = 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;
+
+    if (!(conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_log_main_conf_t)))) {
+        return NGX_CONF_ERROR;
+    }
+
+    ngx_init_array(conf->formats, cf->pool, 5, sizeof(ngx_http_log_fmt_t),
+                  NGX_CONF_ERROR);
+
+    cf->args->nelts = 0;
+
+    if (!(value = ngx_push_array(cf->args))) {
+        return NGX_CONF_ERROR;
+    }
+
+    if (!(value = ngx_push_array(cf->args))) {
+        return NGX_CONF_ERROR;
+    }
+
+    value->len = sizeof("combined") - 1;
+    value->data = (u_char *) "combined";
+
+    if (!(value = ngx_push_array(cf->args))) {
+        return NGX_CONF_ERROR;
+    }
+
+    *value = ngx_http_combined_fmt;
+
+    rc = ngx_http_log_set_format(cf, NULL, conf);
+    if (rc != NGX_CONF_OK) {
+        return NULL;
+    }
+
+    return conf;
+}
+
+
+static void *ngx_http_log_create_loc_conf(ngx_conf_t *cf)
+{
+    ngx_http_log_loc_conf_t  *conf;
+
+    if (!(conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_log_loc_conf_t)))) {
+        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;
+            }
+
+            if (!(log = ngx_array_push(conf->logs))) {
+                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);
+
+    if (!(log = ngx_array_push(llcf->logs))) {
+        return NGX_CONF_ERROR;
+    }
+
+    if (!(log->file = ngx_conf_open_file(cf->cycle, &value[1]))) {
+        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;
+        }
+    }
+
+    return NGX_CONF_OK;
+}
+
+
+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;
+
+    ngx_uint_t                  s, f, invalid;
+    u_char                     *data, *p, *fname;
+    size_t                      i, len, fname_len;
+    ngx_str_t                  *value, arg, *a;
+    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";
+        }
+    }
+
+    if (!(fmt = ngx_push_array(&lmcf->formats))) {
+        return NGX_CONF_ERROR;
+    }
+
+    fmt->name = value[1];
+
+    if (!(fmt->ops = ngx_create_array(cf->pool, 20,
+                                      sizeof(ngx_http_log_op_t)))) {
+        return NGX_CONF_ERROR;
+    }
+
+    invalid = 0;
+    data = NULL;
+
+    for (s = 2; s < cf->args->nelts && !invalid; s++) {
+
+        i = 0;
+
+        while (i < value[s].len) {
+
+            if (!(op = ngx_push_array(fmt->ops))) {
+                return NGX_CONF_ERROR;
+            }
+
+            data = &value[s].data[i];
+
+            if (value[s].data[i] == '%') {
+                i++;
+
+                if (i == value[s].len) {
+                    invalid = 1;
+                    break;
+                }
+
+                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) {
+                        invalid = 1;
+                        break;
+                    }
+
+                    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) {
+                    invalid = 1;
+                    break;
+                }
+
+                for (name = ngx_http_log_fmt_ops; name->op; name++) {
+                    if (name->name.len == 0) {
+                        name = (ngx_http_log_op_name_t *) name->op;
+                    }
+
+                    if (name->name.len == fname_len
+                        && ngx_strncmp(name->name.data, fname, fname_len) == 0)
+                    {
+                        if (name->len != NGX_HTTP_LOG_ARG) {
+                            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->op = name->op;
+                            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;
+                        }
+
+                        if (!(a = ngx_palloc(cf->pool, sizeof(ngx_str_t)))) {
+                            return NGX_CONF_ERROR;
+                        }
+
+                        *a = arg;
+                        name->op(NULL, (u_char *) op, (uintptr_t) a);
+
+                        break;
+                    }
+                }
+
+                if (name->name.len == 0) {
+                    invalid = 1;
+                    break;
+                }
+
+            } else {
+                i++;
+
+                while (i < value[s].len && value[s].data[i] != '%') {
+                    i++;
+                }
+
+                len = &value[s].data[i] - data;
+
+                if (len) {
+
+                    op->len = len;
+
+                    if (len <= sizeof(uintptr_t)) {
+                        op->op = NGX_HTTP_LOG_COPY_SHORT;
+                        op->data = 0;
+
+                        while (len--) {
+                            op->data <<= 8;
+                            op->data |= data[len];
+                        }
+
+                    } else {
+                        op->op = NGX_HTTP_LOG_COPY_LONG;
+
+                        if (!(p = ngx_palloc(cf->pool, len))) {
+                            return NGX_CONF_ERROR;
+                        }
+
+                        ngx_memcpy(p, data, len);
+                        op->data = (uintptr_t) p;
+                    }
+                }
+            }
+        }
+    }
+
+    if (invalid) {
+        ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
+                           "invalid parameter \"%s\"", data);
+        return NGX_CONF_ERROR;
+    }
+
+    return NGX_CONF_OK;
+}