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 #ifndef WIN32
 #define DEBUG_PRINTF(...) /*printf(__VA_ARGS__)*/
 #endif
 /**
  * \defgroup uip The uIP TCP/IP stack
  * @{
+ *
  * uIP is an implementation of the TCP/IP protocol stack intended for
  * small 8-bit and 16-bit microcontrollers.
+ *
  * uIP provides the necessary protocols for Internet communication,
  * with a very small code footprint and RAM requirements - the uIP
  * code size is on the order of a few kilobytes and RAM usage is on
  * the order of a few hundred bytes.
  */
 /**
  * \file
  * The uIP TCP/IP stack code.
  * \author Adam Dunkels <adam@dunkels.com>
  */
 /*
  * Copyright (c) 2001-2003, Adam Dunkels.
  * All rights reserved.
+ *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
  *    documentation and/or other materials provided with the distribution.
  * 3. The name of the author may not be used to endorse or promote
  *    products derived from this software without specific prior
  *    written permission.
+ *
  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
  * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
  * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
  * This file is part of the uIP TCP/IP stack.
+ *
  * $Id: uip.c,v 1.1 2008/05/07 06:59:32 sven-ola Exp $
+ *
  */
 /*
  * uIP is a small implementation of the IP, UDP and TCP protocols (as
  * well as some basic ICMP stuff). The implementation couples the IP,
  * UDP, TCP and the application layers very tightly. To keep the size
  * of the compiled code down, this code frequently uses the goto
  * statement. While it would be possible to break the uip_process()
  * function into many smaller functions, this would increase the code
  * size because of the overhead of parameter passing and the fact that
  * the optimier would not be as efficient.
+ *
  * The principle is that we have a small buffer, called the uip_buf,
  * in which the device driver puts an incoming packet. The TCP/IP
  * stack parses the headers in the packet, and calls the
  * application. If the remote host has sent data to the application,
  * this data is present in the uip_buf and the application read the
  * data from there. It is up to the application to put this data into
  * a byte stream if needed. The application will not be fed with data
  * that is out of sequence.
+ *
  * If the application whishes to send data to the peer, it should put
  * its data into the uip_buf. The uip_appdata pointer points to the
  * first available byte. The TCP/IP stack will calculate the
  * checksums, and fill in the necessary header fields and finally send
  * the packet back to the peer.
 */
 #include "uip.h"
 #include "uipopt.h"
 #include "uip_arch.h"
 #if UIP_CONF_IPV6
 #include "uip-neighbor.h"
 #endif /* UIP_CONF_IPV6 */
 #include <string.h>
 /*---------------------------------------------------------------------------*/
 /* Variable definitions. */
 /* The IP address of this host. If it is defined to be fixed (by
    setting UIP_FIXEDADDR to 1 in uipopt.h), the address is set
    here. Otherwise, the address */
 #if UIP_FIXEDADDR > 0
 const uip_ipaddr_t uip_hostaddr =
   {UIP_HTONS((UIP_IPADDR0 << 8) | UIP_IPADDR1),
    UIP_HTONS((UIP_IPADDR2 << 8) | UIP_IPADDR3)};
 const uip_ipaddr_t uip_draddr =
   {UIP_HTONS((UIP_DRIPADDR0 << 8) | UIP_DRIPADDR1),
    UIP_HTONS((UIP_DRIPADDR2 << 8) | UIP_DRIPADDR3)};
 const uip_ipaddr_t uip_netmask =
   {UIP_HTONS((UIP_NETMASK0 << 8) | UIP_NETMASK1),
    UIP_HTONS((UIP_NETMASK2 << 8) | UIP_NETMASK3)};
 #else
 uip_ipaddr_t uip_hostaddr, uip_draddr, uip_netmask;
 #endif /* UIP_FIXEDADDR */
 static const uip_ipaddr_t all_ones_addr =
 #if UIP_CONF_IPV6
   {0xffff,0xffff,0xffff,0xffff,0xffff,0xffff,0xffff,0xffff};
 #else /* UIP_CONF_IPV6 */
   {0xffff,0xffff};
 #endif /* UIP_CONF_IPV6 */
 static const uip_ipaddr_t all_zeroes_addr =
 #if UIP_CONF_IPV6
   {0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000};
 #else /* UIP_CONF_IPV6 */
   {0x0000,0x0000};
 #endif /* UIP_CONF_IPV6 */
 #if UIP_FIXEDETHADDR
 const struct uip_eth_addr uip_ethaddr = {{UIP_ETHADDR0,
                                           UIP_ETHADDR1,
                                           UIP_ETHADDR2,
                                           UIP_ETHADDR3,
                                           UIP_ETHADDR4,
                                           UIP_ETHADDR5}};
 #else
 struct uip_eth_addr uip_ethaddr = {{0,0,0,0,0,0}};
 #endif
 #ifndef UIP_CONF_EXTERNAL_BUFFER
 u8_t uip_buf[UIP_BUFSIZE + 2];   /* The packet buffer that contains
                                     incoming packets. */
 #endif /* UIP_CONF_EXTERNAL_BUFFER */
 void *uip_appdata;               /* The uip_appdata pointer points to
                                     application data. */
 void *uip_sappdata;              /* The uip_appdata pointer points to
                                     the application data which is to
                                     be sent. */
 #if UIP_URGDATA > 0
 void *uip_urgdata;               /* The uip_urgdata pointer points to
                                        urgent data (out-of-band data), if
                                        present. */
 u16_t uip_urglen, uip_surglen;
 #endif /* UIP_URGDATA > 0 */
 u16_t uip_len, uip_slen;
                              /* The uip_len is either 8 or 16 bits,
                                 depending on the maximum packet
                                 size. */
 u8_t uip_flags;     /* The uip_flags variable is used for
                                 communication between the TCP/IP stack
                                 and the application program. */
 struct uip_conn *uip_conn;   /* uip_conn always points to the current
                                 connection. */
 struct uip_conn uip_conns[UIP_CONNS];
                              /* The uip_conns array holds all TCP
                                 connections. */
 u16_t uip_listenports[UIP_LISTENPORTS];
                              /* The uip_listenports list all currently
                                 listning ports. */
 #if UIP_UDP
 struct uip_udp_conn *uip_udp_conn;
 struct uip_udp_conn uip_udp_conns[UIP_UDP_CONNS];
 #endif /* UIP_UDP */
 static u16_t ipid;           /* Ths ipid variable is an increasing
                                 number that is used for the IP ID
                                 field. */
 void uip_setipid(u16_t id) { ipid = id; }
 static u8_t iss[4];          /* The iss variable is used for the TCP
                                 initial sequence number. */
 #if UIP_ACTIVE_OPEN
 static u16_t lastport;       /* Keeps track of the last port used for
                                 a new connection. */
 #endif /* UIP_ACTIVE_OPEN */
 /* Temporary variables. */
 u8_t uip_acc32[4];
 static u8_t c, opt;
 static u16_t tmp16;
 /* Structures and definitions. */
 #define TCP_FIN 0x01
 #define TCP_SYN 0x02
 #define TCP_RST 0x04
 #define TCP_PSH 0x08
 #define TCP_ACK 0x10
 #define TCP_URG 0x20
 #define TCP_CTL 0x3f
 #define TCP_OPT_END     0   /* End of TCP options list */
 #define TCP_OPT_NOOP    1   /* "No-operation" TCP option */
 #define TCP_OPT_MSS     2   /* Maximum segment size TCP option */
 #define TCP_OPT_MSS_LEN 4   /* Length of TCP MSS option. */
 #define ICMP_ECHO_REPLY 0
 #define ICMP_ECHO       8
 #define ICMP6_ECHO_REPLY             129
 #define ICMP6_ECHO                   128
 #define ICMP6_NEIGHBOR_SOLICITATION  135
 #define ICMP6_NEIGHBOR_ADVERTISEMENT 136
 #define ICMP6_FLAG_S (1 << 6)
 #define ICMP6_OPTION_SOURCE_LINK_ADDRESS 1
 #define ICMP6_OPTION_TARGET_LINK_ADDRESS 2
 /* Macros. */
 #define BUF ((struct uip_tcpip_hdr *)&uip_buf[UIP_LLH_LEN])
 #define FBUF ((struct uip_tcpip_hdr *)&uip_reassbuf[0])
 #define ICMPBUF ((struct uip_icmpip_hdr *)&uip_buf[UIP_LLH_LEN])
 #define UDPBUF ((struct uip_udpip_hdr *)&uip_buf[UIP_LLH_LEN])
 #if UIP_STATISTICS == 1
 struct uip_stats uip_stat;
 #define UIP_STAT(s) s
 #else
 #define UIP_STAT(s)
 #endif /* UIP_STATISTICS == 1 */
 #if UIP_LOGGING == 1
 #include <stdio.h>
 void uip_log(const char *msg);
 #define UIP_LOG(m) uip_log(m)
 #else
 #define UIP_LOG(m)
 #endif /* UIP_LOGGING == 1 */
 #if ! UIP_ARCH_ADD32
 void
 uip_add32(u8_t *op32, u16_t op16)
+{
   uip_acc32[3] = op32[3] + (op16 & 0xff);
   uip_acc32[2] = op32[2] + (op16 >> 8);
   uip_acc32[1] = op32[1];
   uip_acc32[0] = op32[0];
   if(uip_acc32[2] < (op16 >> 8)) {
     ++uip_acc32[1];
     if(uip_acc32[1] == 0) {
       ++uip_acc32[0];
+    }
+  }
   if(uip_acc32[3] < (op16 & 0xff)) {
     ++uip_acc32[2];
     if(uip_acc32[2] == 0) {
       ++uip_acc32[1];
       if(uip_acc32[1] == 0) {
         ++uip_acc32[0];
+      }
+    }
+  }
+}
 #endif /* UIP_ARCH_ADD32 */
 #if ! UIP_ARCH_CHKSUM
 /*---------------------------------------------------------------------------*/
 static u16_t
 chksum(u16_t sum, const u8_t *data, u16_t len)
+{
   u16_t t;
   const u8_t *dataptr;
   const u8_t *last_byte;
   dataptr = data;
   last_byte = data + len - 1;
   while(dataptr < last_byte) {        /* At least two more bytes */
     t = (dataptr[0] << 8) + dataptr[1];
     sum += t;
     if(sum < t) {
       sum++;                /* carry */
+    }
     dataptr += 2;
+  }
   if(dataptr == last_byte) {
     t = (dataptr[0] << 8) + 0;
     sum += t;
     if(sum < t) {
       sum++;                /* carry */
+    }
+  }
   /* Return sum in host byte order. */
   return sum;
+}
 /*---------------------------------------------------------------------------*/
 u16_t
 uip_chksum(u16_t *data, u16_t len)
+{
   return myhtons(chksum(0, (u8_t *)data, len));
+}
 /*---------------------------------------------------------------------------*/
 #ifndef UIP_ARCH_IPCHKSUM
 u16_t
 uip_ipchksum(void)
+{
   u16_t sum;
   sum = chksum(0, &uip_buf[UIP_LLH_LEN], UIP_IPH_LEN);
 #ifndef WIN32
   DEBUG_PRINTF("uip_ipchksum: sum 0x%04x\n", sum);
 #endif
   return (sum == 0) ? 0xffff : myhtons(sum);
+}
 #endif
 /*---------------------------------------------------------------------------*/
 static u16_t
 upper_layer_chksum(u8_t proto)
+{
   u16_t upper_layer_len;
   u16_t sum;
 #if UIP_CONF_IPV6
   upper_layer_len = (((u16_t)(BUF->len[0]) << 8) + BUF->len[1]);
 #else /* UIP_CONF_IPV6 */
   upper_layer_len = (((u16_t)(BUF->len[0]) << 8) + BUF->len[1]) - UIP_IPH_LEN;
 #endif /* UIP_CONF_IPV6 */
   /* First sum pseudoheader. */
   /* IP protocol and length fields. This addition cannot carry. */
   sum = upper_layer_len + proto;
   /* Sum IP source and destination addresses. */
   sum = chksum(sum, (u8_t *)&BUF->srcipaddr[0], 2 * sizeof(uip_ipaddr_t));
   /* Sum TCP header and data. */
   sum = chksum(sum, &uip_buf[UIP_IPH_LEN + UIP_LLH_LEN],
                upper_layer_len);
   return (sum == 0) ? 0xffff : myhtons(sum);
+}
 /*---------------------------------------------------------------------------*/
 #if UIP_CONF_IPV6
 u16_t
 uip_icmp6chksum(void)
+{
   return upper_layer_chksum(UIP_PROTO_ICMP6);
+}
 #endif /* UIP_CONF_IPV6 */
 /*---------------------------------------------------------------------------*/
 u16_t
 uip_tcpchksum(void)
+{
   return upper_layer_chksum(UIP_PROTO_TCP);
+}
 /*---------------------------------------------------------------------------*/
 #if UIP_UDP_CHECKSUMS
 u16_t
 uip_udpchksum(void)
+{
   return upper_layer_chksum(UIP_PROTO_UDP);
+}
 #endif /* UIP_UDP_CHECKSUMS */
 #endif /* UIP_ARCH_CHKSUM */
 /*---------------------------------------------------------------------------*/
 void
 uip_init(void)
+{
   for(c = 0; c < UIP_LISTENPORTS; ++c) {
     uip_listenports[c] = 0;
+  }
   for(c = 0; c < UIP_CONNS; ++c) {
     uip_conns[c].tcpstateflags = UIP_CLOSED;
+  }
 #if UIP_ACTIVE_OPEN
   lastport = 1024;
 #endif /* UIP_ACTIVE_OPEN */
 #if UIP_UDP
   for(c = 0; c < UIP_UDP_CONNS; ++c) {
     uip_udp_conns[c].lport = 0;
+  }
 #endif /* UIP_UDP */
   /* IPv4 initialization. */
 #if UIP_FIXEDADDR == 0
   /*  uip_hostaddr[0] = uip_hostaddr[1] = 0;*/
 #endif /* UIP_FIXEDADDR */
+}
 /*---------------------------------------------------------------------------*/
 #if UIP_ACTIVE_OPEN
 struct uip_conn *
 uip_connect(uip_ipaddr_t *ripaddr, u16_t rport)
+{
   register struct uip_conn *conn, *cconn;
   /* Find an unused local port. */
  again:
   ++lastport;
   if(lastport >= 32000) {
     lastport = 4096;
+  }
   /* Check if this port is already in use, and if so try to find
      another one. */
   for(c = 0; c < UIP_CONNS; ++c) {
     conn = &uip_conns[c];
     if(conn->tcpstateflags != UIP_CLOSED &&
        conn->lport == myhtons(lastport)) {
       goto again;
+    }
+  }
   conn = 0;
   for(c = 0; c < UIP_CONNS; ++c) {
     cconn = &uip_conns[c];
     if(cconn->tcpstateflags == UIP_CLOSED) {
       conn = cconn;
       break;
+    }
     if(cconn->tcpstateflags == UIP_TIME_WAIT) {
       if(conn == 0 ||
          cconn->timer > conn->timer) {
         conn = cconn;
+      }
+    }
+  }
   if(conn == 0) {
     return 0;
+  }
   conn->tcpstateflags = UIP_SYN_SENT;
   conn->snd_nxt[0] = iss[0];
   conn->snd_nxt[1] = iss[1];
   conn->snd_nxt[2] = iss[2];
   conn->snd_nxt[3] = iss[3];
   conn->initialmss = conn->mss = UIP_TCP_MSS;
   conn->len = 1;   /* TCP length of the SYN is one. */
   conn->nrtx = 0;
   conn->timer = 1; /* Send the SYN next time around. */
   conn->rto = UIP_RTO;
   conn->sa = 0;
   conn->sv = 16;   /* Initial value of the RTT variance. */
   conn->lport = myhtons(lastport);
   conn->rport = rport;
   uip_ipaddr_copy(&conn->ripaddr, ripaddr);
   return conn;
+}
 #endif /* UIP_ACTIVE_OPEN */
 /*---------------------------------------------------------------------------*/
 #if UIP_UDP
 struct uip_udp_conn *
 uip_udp_new(uip_ipaddr_t *ripaddr, u16_t rport)
+{
   register struct uip_udp_conn *conn;
   /* Find an unused local port. */
  again:
   ++lastport;
   if(lastport >= 32000) {
     lastport = 4096;
+  }
   for(c = 0; c < UIP_UDP_CONNS; ++c) {
     if(uip_udp_conns[c].lport == myhtons(lastport)) {
       goto again;
+    }
+  }
   conn = 0;
   for(c = 0; c < UIP_UDP_CONNS; ++c) {
     if(uip_udp_conns[c].lport == 0) {
       conn = &uip_udp_conns[c];
       break;
+    }
+  }
   if(conn == 0) {
     return 0;
+  }
   conn->lport = UIP_HTONS(lastport);
   conn->rport = rport;
   if(ripaddr == NULL) {
     memset(conn->ripaddr, 0, sizeof(uip_ipaddr_t));
   } else {
     uip_ipaddr_copy(&conn->ripaddr, ripaddr);
+  }
   conn->ttl = UIP_TTL;
   return conn;
+}
 #endif /* UIP_UDP */
 /*---------------------------------------------------------------------------*/
 void
 uip_unlisten(u16_t port)
+{
   for(c = 0; c < UIP_LISTENPORTS; ++c) {
     if(uip_listenports[c] == port) {
       uip_listenports[c] = 0;
       return;
+    }
+  }
+}
 /*---------------------------------------------------------------------------*/
 void
 uip_listen(u16_t port)
+{
   for(c = 0; c < UIP_LISTENPORTS; ++c) {
     if(uip_listenports[c] == 0) {
       uip_listenports[c] = port;
       return;
+    }
+  }
+}
 /*---------------------------------------------------------------------------*/
 /* XXX: IP fragment reassembly: not well-tested. */
 #if UIP_REASSEMBLY && !UIP_CONF_IPV6
 #define UIP_REASS_BUFSIZE (UIP_BUFSIZE - UIP_LLH_LEN)
 static u8_t uip_reassbuf[UIP_REASS_BUFSIZE];
 static u8_t uip_reassbitmap[UIP_REASS_BUFSIZE / (8 * 8)];
 static const u8_t bitmap_bits[8] = {0xff, 0x7f, 0x3f, 0x1f,
 x0f, 0x07, 0x03, 0x01};
 static u16_t uip_reasslen;
 static u8_t uip_reassflags;
 #define UIP_REASS_FLAG_LASTFRAG 0x01
 static u8_t uip_reasstmr;
 #define IP_MF   0x20
 static u8_t
 uip_reass(void)
+{
   u16_t offset, len;
   u16_t i;
   /* If ip_reasstmr is zero, no packet is present in the buffer, so we
      write the IP header of the fragment into the reassembly
      buffer. The timer is updated with the maximum age. */
   if(uip_reasstmr == 0) {
     memcpy(uip_reassbuf, &BUF->vhl, UIP_IPH_LEN);
     uip_reasstmr = UIP_REASS_MAXAGE;
     uip_reassflags = 0;
     /* Clear the bitmap. */
     memset(uip_reassbitmap, 0, sizeof(uip_reassbitmap));
+  }
   /* Check if the incoming fragment matches the one currently present
      in the reasembly buffer. If so, we proceed with copying the
      fragment into the buffer. */
   if(BUF->srcipaddr[0] == FBUF->srcipaddr[0] &&
      BUF->srcipaddr[1] == FBUF->srcipaddr[1] &&
      BUF->destipaddr[0] == FBUF->destipaddr[0] &&
      BUF->destipaddr[1] == FBUF->destipaddr[1] &&
      BUF->ipid[0] == FBUF->ipid[0] &&
      BUF->ipid[1] == FBUF->ipid[1]) {
     len = (BUF->len[0] << 8) + BUF->len[1] - (BUF->vhl & 0x0f) * 4;
     offset = (((BUF->ipoffset[0] & 0x3f) << 8) + BUF->ipoffset[1]) * 8;
     /* If the offset or the offset + fragment length overflows the
        reassembly buffer, we discard the entire packet. */
     if(offset > UIP_REASS_BUFSIZE ||
        offset + len > UIP_REASS_BUFSIZE) {
       uip_reasstmr = 0;
       goto nullreturn;
+    }
     /* Copy the fragment into the reassembly buffer, at the right
        offset. */
     memcpy(&uip_reassbuf[UIP_IPH_LEN + offset],
            (char *)BUF + (int)((BUF->vhl & 0x0f) * 4),
            len);
     /* Update the bitmap. */
     if(offset / (8 * 8) == (offset + len) / (8 * 8)) {
       /* If the two endpoints are in the same byte, we only update
          that byte. */
       uip_reassbitmap[offset / (8 * 8)] |=
              bitmap_bits[(offset / 8 ) & 7] &
              ~bitmap_bits[((offset + len) / 8 ) & 7];
     } else {
       /* If the two endpoints are in different bytes, we update the
          bytes in the endpoints and fill the stuff inbetween with
 xff. */
       uip_reassbitmap[offset / (8 * 8)] |=
         bitmap_bits[(offset / 8 ) & 7];
       for(i = 1 + offset / (8 * 8); i < (offset + len) / (8 * 8); ++i) {
         uip_reassbitmap[i] = 0xff;
+      }
       uip_reassbitmap[(offset + len) / (8 * 8)] |=
         ~bitmap_bits[((offset + len) / 8 ) & 7];
+    }
     /* If this fragment has the More Fragments flag set to zero, we
        know that this is the last fragment, so we can calculate the
        size of the entire packet. We also set the
        IP_REASS_FLAG_LASTFRAG flag to indicate that we have received
        the final fragment. */
     if((BUF->ipoffset[0] & IP_MF) == 0) {
       uip_reassflags |= UIP_REASS_FLAG_LASTFRAG;
       uip_reasslen = offset + len;
+    }
     /* Finally, we check if we have a full packet in the buffer. We do
        this by checking if we have the last fragment and if all bits
        in the bitmap are set. */
     if(uip_reassflags & UIP_REASS_FLAG_LASTFRAG) {
       /* Check all bytes up to and including all but the last byte in
          the bitmap. */
       for(i = 0; i < uip_reasslen / (8 * 8) - 1; ++i) {
         if(uip_reassbitmap[i] != 0xff) {
           goto nullreturn;
+        }
+      }
       /* Check the last byte in the bitmap. It should contain just the
          right amount of bits. */
       if(uip_reassbitmap[uip_reasslen / (8 * 8)] !=
          (u8_t)~bitmap_bits[uip_reasslen / 8 & 7]) {
         goto nullreturn;
+      }
       /* If we have come this far, we have a full packet in the
          buffer, so we allocate a pbuf and copy the packet into it. We
          also reset the timer. */
       uip_reasstmr = 0;
       memcpy(BUF, FBUF, uip_reasslen);
       /* Pretend to be a "normal" (i.e., not fragmented) IP packet
          from now on. */
       BUF->ipoffset[0] = BUF->ipoffset[1] = 0;
       BUF->len[0] = uip_reasslen >> 8;
       BUF->len[1] = uip_reasslen & 0xff;
       BUF->ipchksum = 0;
       BUF->ipchksum = ~(uip_ipchksum());
       return uip_reasslen;
+    }
+  }
  nullreturn:
   return 0;
+}
 #endif /* UIP_REASSEMBLY */
 /*---------------------------------------------------------------------------*/
 static void
 uip_add_rcv_nxt(u16_t n)
+{
   uip_add32(uip_conn->rcv_nxt, n);
   uip_conn->rcv_nxt[0] = uip_acc32[0];
   uip_conn->rcv_nxt[1] = uip_acc32[1];
   uip_conn->rcv_nxt[2] = uip_acc32[2];
   uip_conn->rcv_nxt[3] = uip_acc32[3];
+}
 /*---------------------------------------------------------------------------*/
 void
 uip_process(u8_t flag)
+{
   register struct uip_conn *uip_connr = uip_conn;
 #if UIP_UDP
   if(flag == UIP_UDP_SEND_CONN) {
     goto udp_send;
+  }
 #endif /* UIP_UDP */
   uip_sappdata = uip_appdata = &uip_buf[UIP_IPTCPH_LEN + UIP_LLH_LEN];
   /* Check if we were invoked because of a poll request for a
      particular connection. */
   if(flag == UIP_POLL_REQUEST) {
     if((uip_connr->tcpstateflags & UIP_TS_MASK) == UIP_ESTABLISHED &&
        !uip_outstanding(uip_connr)) {
         uip_flags = UIP_POLL;
         UIP_APPCALL();
         goto appsend;
+    }
     goto drop;
     /* Check if we were invoked because of the perodic timer fireing. */
   } else if(flag == UIP_TIMER) {
 #if UIP_REASSEMBLY
     if(uip_reasstmr != 0) {
       --uip_reasstmr;
+    }
 #endif /* UIP_REASSEMBLY */
     /* Increase the initial sequence number. */
     if(++iss[3] == 0) {
       if(++iss[2] == 0) {
         if(++iss[1] == 0) {
           ++iss[0];
+        }
+      }
+    }
     /* Reset the length variables. */
     uip_len = 0;
     uip_slen = 0;
     /* Check if the connection is in a state in which we simply wait
        for the connection to time out. If so, we increase the
        connection's timer and remove the connection if it times
        out. */
     if(uip_connr->tcpstateflags == UIP_TIME_WAIT ||
        uip_connr->tcpstateflags == UIP_FIN_WAIT_2) {
       ++(uip_connr->timer);
       if(uip_connr->timer == UIP_TIME_WAIT_TIMEOUT) {
         uip_connr->tcpstateflags = UIP_CLOSED;
+      }
     } else if(uip_connr->tcpstateflags != UIP_CLOSED) {
       /* If the connection has outstanding data, we increase the
          connection's timer and see if it has reached the RTO value
          in which case we retransmit. */
       if(uip_outstanding(uip_connr)) {
         if(uip_connr->timer-- == 0) {
           if(uip_connr->nrtx == UIP_MAXRTX ||
              ((uip_connr->tcpstateflags == UIP_SYN_SENT ||
                uip_connr->tcpstateflags == UIP_SYN_RCVD) &&
               uip_connr->nrtx == UIP_MAXSYNRTX)) {
             uip_connr->tcpstateflags = UIP_CLOSED;
             /* We call UIP_APPCALL() with uip_flags set to
                UIP_TIMEDOUT to inform the application that the
                connection has timed out. */
             uip_flags = UIP_TIMEDOUT;
             UIP_APPCALL();
             /* We also send a reset packet to the remote host. */
             BUF->flags = TCP_RST | TCP_ACK;
             goto tcp_send_nodata;
+          }
           /* Exponential backoff. */
           uip_connr->timer = UIP_RTO << (uip_connr->nrtx > 4?
 :
                                          uip_connr->nrtx);
           ++(uip_connr->nrtx);
           /* Ok, so we need to retransmit. We do this differently
              depending on which state we are in. In ESTABLISHED, we
              call upon the application so that it may prepare the
              data for the retransmit. In SYN_RCVD, we resend the
              SYNACK that we sent earlier and in LAST_ACK we have to
              retransmit our FINACK. */
           UIP_STAT(++uip_stat.tcp.rexmit);
           switch(uip_connr->tcpstateflags & UIP_TS_MASK) {
           case UIP_SYN_RCVD:
             /* In the SYN_RCVD state, we should retransmit our
                SYNACK. */
             goto tcp_send_synack;
 #if UIP_ACTIVE_OPEN
           case UIP_SYN_SENT:
             /* In the SYN_SENT state, we retransmit out SYN. */
             BUF->flags = 0;
             goto tcp_send_syn;
 #endif /* UIP_ACTIVE_OPEN */
           case UIP_ESTABLISHED:
             /* In the ESTABLISHED state, we call upon the application
                to do the actual retransmit after which we jump into
                the code for sending out the packet (the apprexmit
                label). */
             uip_flags = UIP_REXMIT;
             UIP_APPCALL();
             goto apprexmit;
           case UIP_FIN_WAIT_1:
           case UIP_CLOSING:
           case UIP_LAST_ACK:
             /* In all these states we should retransmit a FINACK. */
             goto tcp_send_finack;
+          }
+        }
       } else if((uip_connr->tcpstateflags & UIP_TS_MASK) == UIP_ESTABLISHED) {
         /* If there was no need for a retransmission, we poll the
            application for new data. */
         uip_flags = UIP_POLL;
         UIP_APPCALL();
         goto appsend;
+      }
+    }
     goto drop;
+  }
 #if UIP_UDP
   if(flag == UIP_UDP_TIMER) {
     if(uip_udp_conn->lport != 0) {
       uip_conn = NULL;
       uip_sappdata = uip_appdata = &uip_buf[UIP_LLH_LEN + UIP_IPUDPH_LEN];
       uip_len = uip_slen = 0;
       uip_flags = UIP_POLL;
       UIP_UDP_APPCALL();
       goto udp_send;
     } else {
       goto drop;
+    }
+  }
 #endif
   /* This is where the input processing starts. */
   UIP_STAT(++uip_stat.ip.recv);
   /* Start of IP input header processing code. */
 #if UIP_CONF_IPV6
   /* Check validity of the IP header. */
   if((BUF->vtc & 0xf0) != 0x60)  { /* IP version and header length. */
     UIP_STAT(++uip_stat.ip.drop);
     UIP_STAT(++uip_stat.ip.vhlerr);
     UIP_LOG("ipv6: invalid version.");
     goto drop;
+  }
 #else /* UIP_CONF_IPV6 */
   /* Check validity of the IP header. */
   if(BUF->vhl != 0x45)  { /* IP version and header length. */
     UIP_STAT(++uip_stat.ip.drop);
     UIP_STAT(++uip_stat.ip.vhlerr);
     UIP_LOG("ip: invalid version or header length.");
     goto drop;
+  }
 #endif /* UIP_CONF_IPV6 */
   /* Check the size of the packet. If the size reported to us in
      uip_len is smaller the size reported in the IP header, we assume
      that the packet has been corrupted in transit. If the size of
      uip_len is larger than the size reported in the IP packet header,
      the packet has been padded and we set uip_len to the correct
      value.. */
   if((BUF->len[0] << 8) + BUF->len[1] <= uip_len) {
     uip_len = (BUF->len[0] << 8) + BUF->len[1];
 #if UIP_CONF_IPV6
     uip_len += 40; /* The length reported in the IPv6 header is the
                       length of the payload that follows the
                       header. However, uIP uses the uip_len variable
                       for holding the size of the entire packet,
                       including the IP header. For IPv4 this is not a
                       problem as the length field in the IPv4 header
                       contains the length of the entire packet. But
                       for IPv6 we need to add the size of the IPv6
                       header (40 bytes). */
 #endif /* UIP_CONF_IPV6 */
   } else {
     UIP_LOG("ip: packet shorter than reported in IP header.");
     goto drop;
+  }
 #if !UIP_CONF_IPV6
   /* Check the fragment flag. */
   if((BUF->ipoffset[0] & 0x3f) != 0 ||
      BUF->ipoffset[1] != 0) {
 #if UIP_REASSEMBLY
     uip_len = uip_reass();
     if(uip_len == 0) {
       goto drop;
+    }
 #else /* UIP_REASSEMBLY */
     UIP_STAT(++uip_stat.ip.drop);
     UIP_STAT(++uip_stat.ip.fragerr);
     UIP_LOG("ip: fragment dropped.");
     goto drop;
 #endif /* UIP_REASSEMBLY */
+  }
 #endif /* UIP_CONF_IPV6 */
   if(uip_ipaddr_cmp(uip_hostaddr, all_zeroes_addr)) {
     /* If we are configured to use ping IP address configuration and
        hasn't been assigned an IP address yet, we accept all ICMP
        packets. */
 #if UIP_PINGADDRCONF && !UIP_CONF_IPV6
     if(BUF->proto == UIP_PROTO_ICMP) {
       UIP_LOG("ip: possible ping config packet received.");
       goto icmp_input;
     } else {
       UIP_LOG("ip: packet dropped since no address assigned.");
       goto drop;
+    }
 #endif /* UIP_PINGADDRCONF */
   } else {
     /* If IP broadcast support is configured, we check for a broadcast
        UDP packet, which may be destined to us. */
 #if UIP_BROADCAST
 #ifndef WIN32
     DEBUG_PRINTF("UDP IP checksum 0x%04x\n", uip_ipchksum());
 #endif
     if(BUF->proto == UIP_PROTO_UDP &&
        uip_ipaddr_cmp(BUF->destipaddr, all_ones_addr)
        /*&&
          uip_ipchksum() == 0xffff*/) {
       goto udp_input;
+    }
 #endif /* UIP_BROADCAST */
     /* Check if the packet is destined for our IP address. */
 #if !UIP_CONF_IPV6
     if(!uip_ipaddr_cmp(BUF->destipaddr, uip_hostaddr)) {
       UIP_STAT(++uip_stat.ip.drop);
       goto drop;
+    }
 #else /* UIP_CONF_IPV6 */
     /* For IPv6, packet reception is a little trickier as we need to
        make sure that we listen to certain multicast addresses (all
        hosts multicast address, and the solicited-node multicast
        address) as well. However, we will cheat here and accept all
        multicast packets that are sent to the ff02::/16 addresses. */
     if(!uip_ipaddr_cmp(BUF->destipaddr, uip_hostaddr) &&
        BUF->destipaddr[0] != UIP_HTONS(0xff02)) {
       UIP_STAT(++uip_stat.ip.drop);
       goto drop;
+    }
 #endif /* UIP_CONF_IPV6 */
+  }
 #if !UIP_CONF_IPV6
   if(uip_ipchksum() != 0xffff) { /* Compute and check the IP header
                                     checksum. */
     UIP_STAT(++uip_stat.ip.drop);
     UIP_STAT(++uip_stat.ip.chkerr);
     UIP_LOG("ip: bad checksum.");
     goto drop;
+  }
 #endif /* UIP_CONF_IPV6 */
   if(BUF->proto == UIP_PROTO_TCP) { /* Check for TCP packet. If so,
                                        proceed with TCP input
                                        processing. */
     goto tcp_input;
+  }
 #if UIP_UDP
   if(BUF->proto == UIP_PROTO_UDP) {
     goto udp_input;
+  }
 #endif /* UIP_UDP */
 #if !UIP_CONF_IPV6
   /* ICMPv4 processing code follows. */
   if(BUF->proto != UIP_PROTO_ICMP) { /* We only allow ICMP packets from
                                         here. */
     UIP_STAT(++uip_stat.ip.drop);
     UIP_STAT(++uip_stat.ip.protoerr);
     UIP_LOG("ip: neither tcp nor icmp.");
     goto drop;
+  }
 #if UIP_PINGADDRCONF
  icmp_input:
 #endif /* UIP_PINGADDRCONF */
   UIP_STAT(++uip_stat.icmp.recv);
   /* ICMP echo (i.e., ping) processing. This is simple, we only change
      the ICMP type from ECHO to ECHO_REPLY and adjust the ICMP
      checksum before we return the packet. */
   if(ICMPBUF->type != ICMP_ECHO) {
     UIP_STAT(++uip_stat.icmp.drop);
     UIP_STAT(++uip_stat.icmp.typeerr);
     UIP_LOG("icmp: not icmp echo.");
     goto drop;
+  }
   /* If we are configured to use ping IP address assignment, we use
      the destination IP address of this ping packet and assign it to
      ourself. */
 #if UIP_PINGADDRCONF
   if((uip_hostaddr[0] | uip_hostaddr[1]) == 0) {
     uip_hostaddr[0] = BUF->destipaddr[0];
     uip_hostaddr[1] = BUF->destipaddr[1];
+  }
 #endif /* UIP_PINGADDRCONF */
   ICMPBUF->type = ICMP_ECHO_REPLY;
   if(ICMPBUF->icmpchksum >= UIP_HTONS(0xffff - (ICMP_ECHO << 8))) {
     ICMPBUF->icmpchksum += UIP_HTONS(ICMP_ECHO << 8) + 1;
   } else {
     ICMPBUF->icmpchksum += UIP_HTONS(ICMP_ECHO << 8);
+  }
   /* Swap IP addresses. */
   uip_ipaddr_copy(BUF->destipaddr, BUF->srcipaddr);
   uip_ipaddr_copy(BUF->srcipaddr, uip_hostaddr);
   UIP_STAT(++uip_stat.icmp.sent);
   goto send;
   /* End of IPv4 input header processing code. */
 #else /* !UIP_CONF_IPV6 */
   /* This is IPv6 ICMPv6 processing code. */
 #ifndef WIN32
   DEBUG_PRINTF("icmp6_input: length %d\n", uip_len);
 #endif
   if(BUF->proto != UIP_PROTO_ICMP6) { /* We only allow ICMPv6 packets from
                                          here. */
     UIP_STAT(++uip_stat.ip.drop);
     UIP_STAT(++uip_stat.ip.protoerr);
     UIP_LOG("ip: neither tcp nor icmp6.");
     goto drop;
+  }
   UIP_STAT(++uip_stat.icmp.recv);
   /* If we get a neighbor solicitation for our address we should send
      a neighbor advertisement message back. */
   if(ICMPBUF->type == ICMP6_NEIGHBOR_SOLICITATION) {
     if(uip_ipaddr_cmp(ICMPBUF->icmp6data, uip_hostaddr)) {
       if(ICMPBUF->options[0] == ICMP6_OPTION_SOURCE_LINK_ADDRESS) {
         /* Save the sender's address in our neighbor list. */
         uip_neighbor_add(ICMPBUF->srcipaddr, &(ICMPBUF->options[2]));
+      }
       /* We should now send a neighbor advertisement back to where the
          neighbor solicication came from. */
       ICMPBUF->type = ICMP6_NEIGHBOR_ADVERTISEMENT;
       ICMPBUF->flags = ICMP6_FLAG_S; /* Solicited flag. */
       ICMPBUF->reserved1 = ICMPBUF->reserved2 = ICMPBUF->reserved3 = 0;
       uip_ipaddr_copy(ICMPBUF->destipaddr, ICMPBUF->srcipaddr);
       uip_ipaddr_copy(ICMPBUF->srcipaddr, uip_hostaddr);
       ICMPBUF->options[0] = ICMP6_OPTION_TARGET_LINK_ADDRESS;
       ICMPBUF->options[1] = 1;  /* Options length, 1 = 8 bytes. */
       memcpy(&(ICMPBUF->options[2]), &uip_ethaddr, sizeof(uip_ethaddr));
       ICMPBUF->icmpchksum = 0;
       ICMPBUF->icmpchksum = ~uip_icmp6chksum();
       goto send;
+    }
     goto drop;
   } else if(ICMPBUF->type == ICMP6_ECHO) {
     /* ICMP echo (i.e., ping) processing. This is simple, we only
        change the ICMP type from ECHO to ECHO_REPLY and update the
        ICMP checksum before we return the packet. */
     ICMPBUF->type = ICMP6_ECHO_REPLY;
     uip_ipaddr_copy(BUF->destipaddr, BUF->srcipaddr);
     uip_ipaddr_copy(BUF->srcipaddr, uip_hostaddr);
     ICMPBUF->icmpchksum = 0;
     ICMPBUF->icmpchksum = ~uip_icmp6chksum();
     UIP_STAT(++uip_stat.icmp.sent);
     goto send;
   } else {
 #ifndef WIN32
     DEBUG_PRINTF("Unknown icmp6 message type %d\n", ICMPBUF->type);
 #endif
     UIP_STAT(++uip_stat.icmp.drop);
     UIP_STAT(++uip_stat.icmp.typeerr);
     UIP_LOG("icmp: unknown ICMP message.");
     goto drop;
+  }
   /* End of IPv6 ICMP processing. */
 #endif /* !UIP_CONF_IPV6 */
 #if UIP_UDP
   /* UDP input processing. */
  udp_input:
   /* UDP processing is really just a hack. We don't do anything to the
      UDP/IP headers, but let the UDP application do all the hard
      work. If the application sets uip_slen, it has a packet to
      send. */
 #if UIP_UDP_CHECKSUMS
   uip_len = uip_len - UIP_IPUDPH_LEN;
   uip_appdata = &uip_buf[UIP_LLH_LEN + UIP_IPUDPH_LEN];
   if(UDPBUF->udpchksum != 0 && uip_udpchksum() != 0xffff) {
     UIP_STAT(++uip_stat.udp.drop);
     UIP_STAT(++uip_stat.udp.chkerr);
     UIP_LOG("udp: bad checksum.");
     goto drop;
+  }
 #else /* UIP_UDP_CHECKSUMS */
   uip_len = uip_len - UIP_IPUDPH_LEN;
 #endif /* UIP_UDP_CHECKSUMS */
   /* Demultiplex this UDP packet between the UDP "connections". */
   for(uip_udp_conn = &uip_udp_conns[0];
       uip_udp_conn < &uip_udp_conns[UIP_UDP_CONNS];
       ++uip_udp_conn) {
     /* Sven-Ola: If the remote port is 0xffff this is a new connection */
     if(0xffff == uip_udp_conn->rport) {
        uip_udp_conn->rport = UDPBUF->srcport;
        memmove(&uip_udp_conn->ripaddr, &BUF->srcipaddr, sizeof(uip_udp_conn->ripaddr));
+    }
     /* If the local UDP port is non-zero, the connection is considered
        to be used. If so, the local port number is checked against the
        destination port number in the received packet. If the two port
        numbers match, the remote port number is checked if the
        connection is bound to a remote port. Finally, if the
        connection is bound to a remote IP address, the source IP
        address of the packet is checked. */
     if(uip_udp_conn->lport != 0 &&
        UDPBUF->destport == uip_udp_conn->lport &&
        (uip_udp_conn->rport == 0 ||
         UDPBUF->srcport == uip_udp_conn->rport) &&
        (uip_ipaddr_cmp(uip_udp_conn->ripaddr, all_zeroes_addr) ||
         uip_ipaddr_cmp(uip_udp_conn->ripaddr, all_ones_addr) ||
         uip_ipaddr_cmp(BUF->srcipaddr, uip_udp_conn->ripaddr))) {
       goto udp_found;
+    }
+  }
   UIP_LOG("udp: no matching connection found");
   goto drop;
  udp_found:
   uip_conn = NULL;
   uip_flags = UIP_NEWDATA;
   uip_sappdata = uip_appdata = &uip_buf[UIP_LLH_LEN + UIP_IPUDPH_LEN];
   uip_slen = 0;
   UIP_UDP_APPCALL();
  udp_send:
   if(uip_slen == 0) {
     goto drop;
+  }
   uip_len = uip_slen + UIP_IPUDPH_LEN;
 #if UIP_CONF_IPV6
   /* For IPv6, the IP length field does not include the IPv6 IP header
      length. */
   BUF->len[0] = ((uip_len - UIP_IPH_LEN) >> 8);
   BUF->len[1] = ((uip_len - UIP_IPH_LEN) & 0xff);
 #else /* UIP_CONF_IPV6 */
   BUF->len[0] = (uip_len >> 8);
   BUF->len[1] = (uip_len & 0xff);
 #endif /* UIP_CONF_IPV6 */
   BUF->ttl = uip_udp_conn->ttl;
   BUF->proto = UIP_PROTO_UDP;
   UDPBUF->udplen = UIP_HTONS(uip_slen + UIP_UDPH_LEN);
   UDPBUF->udpchksum = 0;
   BUF->srcport  = uip_udp_conn->lport;
   BUF->destport = uip_udp_conn->rport;
   uip_ipaddr_copy(BUF->srcipaddr, uip_hostaddr);
   uip_ipaddr_copy(BUF->destipaddr, uip_udp_conn->ripaddr);
   uip_appdata = &uip_buf[UIP_LLH_LEN + UIP_IPTCPH_LEN];
 #if UIP_UDP_CHECKSUMS
   /* Calculate UDP checksum. */
   UDPBUF->udpchksum = ~(uip_udpchksum());
   if(UDPBUF->udpchksum == 0) {
     UDPBUF->udpchksum = 0xffff;
+  }
 #endif /* UIP_UDP_CHECKSUMS */
   goto ip_send_nolen;
 #endif /* UIP_UDP */
   /* TCP input processing. */
  tcp_input:
   UIP_STAT(++uip_stat.tcp.recv);
   /* Start of TCP input header processing code. */
   if(uip_tcpchksum() != 0xffff) {   /* Compute and check the TCP
                                        checksum. */
     UIP_STAT(++uip_stat.tcp.drop);
     UIP_STAT(++uip_stat.tcp.chkerr);
     UIP_LOG("tcp: bad checksum.");
     goto drop;
+  }
   /* Demultiplex this segment. */
   /* First check any active connections. */
   for(uip_connr = &uip_conns[0]; uip_connr <= &uip_conns[UIP_CONNS - 1];
       ++uip_connr) {
     if(uip_connr->tcpstateflags != UIP_CLOSED &&
        BUF->destport == uip_connr->lport &&
        BUF->srcport == uip_connr->rport &&
        uip_ipaddr_cmp(BUF->srcipaddr, uip_connr->ripaddr)) {
       goto found;
+    }
+  }
   /* If we didn't find and active connection that expected the packet,
      either this packet is an old duplicate, or this is a SYN packet
      destined for a connection in LISTEN. If the SYN flag isn't set,
      it is an old packet and we send a RST. */
   if((BUF->flags & TCP_CTL) != TCP_SYN) {
     goto reset;
+  }
   tmp16 = BUF->destport;
   /* Next, check listening connections. */
   for(c = 0; c < UIP_LISTENPORTS; ++c) {
     if(tmp16 == uip_listenports[c])
       goto found_listen;
+  }
   /* No matching connection found, so we send a RST packet. */
   UIP_STAT(++uip_stat.tcp.synrst);
  reset:
   /* We do not send resets in response to resets. */
   if(BUF->flags & TCP_RST) {
     goto drop;
+  }
   UIP_STAT(++uip_stat.tcp.rst);
   BUF->flags = TCP_RST | TCP_ACK;
   uip_len = UIP_IPTCPH_LEN;
   BUF->tcpoffset = 5 << 4;
   /* Flip the seqno and ackno fields in the TCP header. */
   c = BUF->seqno[3];
   BUF->seqno[3] = BUF->ackno[3];
   BUF->ackno[3] = c;
   c = BUF->seqno[2];
   BUF->seqno[2] = BUF->ackno[2];
   BUF->ackno[2] = c;
   c = BUF->seqno[1];
   BUF->seqno[1] = BUF->ackno[1];
   BUF->ackno[1] = c;
   c = BUF->seqno[0];
   BUF->seqno[0] = BUF->ackno[0];
   BUF->ackno[0] = c;
   /* We also have to increase the sequence number we are
      acknowledging. If the least significant byte overflowed, we need
      to propagate the carry to the other bytes as well. */
   if(++BUF->ackno[3] == 0) {
     if(++BUF->ackno[2] == 0) {
       if(++BUF->ackno[1] == 0) {
         ++BUF->ackno[0];
+      }
+    }
+  }
   /* Swap port numbers. */
   tmp16 = BUF->srcport;
   BUF->srcport = BUF->destport;
   BUF->destport = tmp16;
   /* Swap IP addresses. */
   uip_ipaddr_copy(BUF->destipaddr, BUF->srcipaddr);
   uip_ipaddr_copy(BUF->srcipaddr, uip_hostaddr);
   /* And send out the RST packet! */
   goto tcp_send_noconn;
   /* This label will be jumped to if we matched the incoming packet
      with a connection in LISTEN. In that case, we should create a new
      connection and send a SYNACK in return. */
  found_listen:
   /* First we check if there are any connections avaliable. Unused
      connections are kept in the same table as used connections, but
      unused ones have the tcpstate set to CLOSED. Also, connections in
      TIME_WAIT are kept track of and we'll use the oldest one if no
      CLOSED connections are found. Thanks to Eddie C. Dost for a very
      nice algorithm for the TIME_WAIT search. */
   uip_connr = 0;
   for(c = 0; c < UIP_CONNS; ++c) {
     if(uip_conns[c].tcpstateflags == UIP_CLOSED) {
       uip_connr = &uip_conns[c];
       break;
+    }
     if(uip_conns[c].tcpstateflags == UIP_TIME_WAIT) {
       if(uip_connr == 0 ||
          uip_conns[c].timer > uip_connr->timer) {
         uip_connr = &uip_conns[c];
+      }
+    }
+  }
   if(uip_connr == 0) {
     /* All connections are used already, we drop packet and hope that
        the remote end will retransmit the packet at a time when we
        have more spare connections. */
     UIP_STAT(++uip_stat.tcp.syndrop);
     UIP_LOG("tcp: found no unused connections.");
     goto drop;
+  }
   uip_conn = uip_connr;
   /* Fill in the necessary fields for the new connection. */
   uip_connr->rto = uip_connr->timer = UIP_RTO;
   uip_connr->sa = 0;
   uip_connr->sv = 4;
   uip_connr->nrtx = 0;
   uip_connr->lport = BUF->destport;
   uip_connr->rport = BUF->srcport;
   uip_ipaddr_copy(uip_connr->ripaddr, BUF->srcipaddr);
   uip_connr->tcpstateflags = UIP_SYN_RCVD;
   uip_connr->snd_nxt[0] = iss[0];
   uip_connr->snd_nxt[1] = iss[1];
   uip_connr->snd_nxt[2] = iss[2];
   uip_connr->snd_nxt[3] = iss[3];
   uip_connr->len = 1;
   /* rcv_nxt should be the seqno from the incoming packet + 1. */
   uip_connr->rcv_nxt[3] = BUF->seqno[3];
   uip_connr->rcv_nxt[2] = BUF->seqno[2];
   uip_connr->rcv_nxt[1] = BUF->seqno[1];
   uip_connr->rcv_nxt[0] = BUF->seqno[0];
   uip_add_rcv_nxt(1);
   /* Parse the TCP MSS option, if present. */
   if((BUF->tcpoffset & 0xf0) > 0x50) {
     for(c = 0; c < ((BUF->tcpoffset >> 4) - 5) << 2 ;) {
       opt = uip_buf[UIP_TCPIP_HLEN + UIP_LLH_LEN + c];
       if(opt == TCP_OPT_END) {
         /* End of options. */
         break;
       } else if(opt == TCP_OPT_NOOP) {
         ++c;
         /* NOP option. */
       } else if(opt == TCP_OPT_MSS &&
                 uip_buf[UIP_TCPIP_HLEN + UIP_LLH_LEN + 1 + c] == TCP_OPT_MSS_LEN) {
         /* An MSS option with the right option length. */
         tmp16 = ((u16_t)uip_buf[UIP_TCPIP_HLEN + UIP_LLH_LEN + 2 + c] << 8) |
           (u16_t)uip_buf[UIP_IPTCPH_LEN + UIP_LLH_LEN + 3 + c];
         uip_connr->initialmss = uip_connr->mss =
           tmp16 > UIP_TCP_MSS? UIP_TCP_MSS: tmp16;
         /* And we are done processing options. */
         break;
       } else {
         /* All other options have a length field, so that we easily
            can skip past them. */
         if(uip_buf[UIP_TCPIP_HLEN + UIP_LLH_LEN + 1 + c] == 0) {
           /* If the length field is zero, the options are malformed
              and we don't process them further. */
           break;
+        }
         c += uip_buf[UIP_TCPIP_HLEN + UIP_LLH_LEN + 1 + c];
+      }
+    }
+  }
   /* Our response will be a SYNACK. */
 #if UIP_ACTIVE_OPEN
  tcp_send_synack:
   BUF->flags = TCP_ACK;
  tcp_send_syn:
   BUF->flags |= TCP_SYN;
 #else /* UIP_ACTIVE_OPEN */
  tcp_send_synack:
   BUF->flags = TCP_SYN | TCP_ACK;
 #endif /* UIP_ACTIVE_OPEN */
   /* We send out the TCP Maximum Segment Size option with our
      SYNACK. */
   BUF->optdata[0] = TCP_OPT_MSS;
   BUF->optdata[1] = TCP_OPT_MSS_LEN;
   BUF->optdata[2] = (UIP_TCP_MSS) / 256;
   BUF->optdata[3] = (UIP_TCP_MSS) & 255;
   uip_len = UIP_IPTCPH_LEN + TCP_OPT_MSS_LEN;
   BUF->tcpoffset = ((UIP_TCPH_LEN + TCP_OPT_MSS_LEN) / 4) << 4;
   goto tcp_send;
   /* This label will be jumped to if we found an active connection. */
  found:
   uip_conn = uip_connr;
   uip_flags = 0;
   /* We do a very naive form of TCP reset processing; we just accept
      any RST and kill our connection. We should in fact check if the
      sequence number of this reset is wihtin our advertised window
      before we accept the reset. */
   if(BUF->flags & TCP_RST) {
 #if 0
     uip_connr->tcpstateflags = UIP_CLOSED;
     UIP_LOG("tcp: got reset, aborting connection.");
     uip_flags = UIP_ABORT;
     UIP_APPCALL();
 #else
     /* Sven-Ola: we simply ignore... */
     UIP_LOG("tcp: got reset, try to continue.");
 #endif
     goto drop;
+  }
   /* Calculated the length of the data, if the application has sent
      any data to us. */
   c = (BUF->tcpoffset >> 4) << 2;
   /* uip_len will contain the length of the actual TCP data. This is
      calculated by subtracing the length of the TCP header (in
      c) and the length of the IP header (20 bytes). */
   uip_len = uip_len - c - UIP_IPH_LEN;
   /* First, check if the sequence number of the incoming packet is
      what we're expecting next. If not, we send out an ACK with the
      correct numbers in. */
   if(!(((uip_connr->tcpstateflags & UIP_TS_MASK) == UIP_SYN_SENT) &&
        ((BUF->flags & TCP_CTL) == (TCP_SYN | TCP_ACK)))) {
     if((uip_len > 0 || ((BUF->flags & (TCP_SYN | TCP_FIN)) != 0)) &&
        (BUF->seqno[0] != uip_connr->rcv_nxt[0] ||
         BUF->seqno[1] != uip_connr->rcv_nxt[1] ||
         BUF->seqno[2] != uip_connr->rcv_nxt[2] ||
         BUF->seqno[3] != uip_connr->rcv_nxt[3])) {
       goto tcp_send_ack;
+    }
+  }
   /* Next, check if the incoming segment acknowledges any outstanding
      data. If so, we update the sequence number, reset the length of
      the outstanding data, calculate RTT estimations, and reset the
      retransmission timer. */
   if((BUF->flags & TCP_ACK) && uip_outstanding(uip_connr)) {
     uip_add32(uip_connr->snd_nxt, uip_connr->len);
     if(BUF->ackno[0] == uip_acc32[0] &&
        BUF->ackno[1] == uip_acc32[1] &&
        BUF->ackno[2] == uip_acc32[2] &&
        BUF->ackno[3] == uip_acc32[3]) {
       /* Update sequence number. */
       uip_connr->snd_nxt[0] = uip_acc32[0];
       uip_connr->snd_nxt[1] = uip_acc32[1];
       uip_connr->snd_nxt[2] = uip_acc32[2];
       uip_connr->snd_nxt[3] = uip_acc32[3];
       /* Do RTT estimation, unless we have done retransmissions. */
       if(uip_connr->nrtx == 0) {
         signed char m;
         m = uip_connr->rto - uip_connr->timer;
         /* This is taken directly from VJs original code in his paper */
         m = m - (uip_connr->sa >> 3);
         uip_connr->sa += m;
         if(m < 0) {
           m = -m;
+        }
         m = m - (uip_connr->sv >> 2);
         uip_connr->sv += m;
         uip_connr->rto = (uip_connr->sa >> 3) + uip_connr->sv;
+      }
       /* Set the acknowledged flag. */
       uip_flags = UIP_ACKDATA;
       /* Reset the retransmission timer. */
       uip_connr->timer = uip_connr->rto;
       /* Reset length of outstanding data. */
       uip_connr->len = 0;
+    }
+  }
   /* Do different things depending on in what state the connection is. */
   switch(uip_connr->tcpstateflags & UIP_TS_MASK) {
     /* CLOSED and LISTEN are not handled here. CLOSE_WAIT is not
         implemented, since we force the application to close when the
         peer sends a FIN (hence the application goes directly from
         ESTABLISHED to LAST_ACK). */
   case UIP_SYN_RCVD:
     /* In SYN_RCVD we have sent out a SYNACK in response to a SYN, and
        we are waiting for an ACK that acknowledges the data we sent
        out the last time. Therefore, we want to have the UIP_ACKDATA
        flag set. If so, we enter the ESTABLISHED state. */
     if(uip_flags & UIP_ACKDATA) {
       uip_connr->tcpstateflags = UIP_ESTABLISHED;
       uip_flags = UIP_CONNECTED;
       uip_connr->len = 0;
       if(uip_len > 0) {
         uip_flags |= UIP_NEWDATA;
         uip_add_rcv_nxt(uip_len);
+      }
       uip_slen = 0;
       UIP_APPCALL();
       goto appsend;
+    }
     goto drop;
 #if UIP_ACTIVE_OPEN
   case UIP_SYN_SENT:
     /* In SYN_SENT, we wait for a SYNACK that is sent in response to
        our SYN. The rcv_nxt is set to sequence number in the SYNACK
        plus one, and we send an ACK. We move into the ESTABLISHED
        state. */
     if((uip_flags & UIP_ACKDATA) &&
        (BUF->flags & TCP_CTL) == (TCP_SYN | TCP_ACK)) {
       /* Parse the TCP MSS option, if present. */
       if((BUF->tcpoffset & 0xf0) > 0x50) {
         for(c = 0; c < ((BUF->tcpoffset >> 4) - 5) << 2 ;) {
           opt = uip_buf[UIP_IPTCPH_LEN + UIP_LLH_LEN + c];
           if(opt == TCP_OPT_END) {
             /* End of options. */
             break;
           } else if(opt == TCP_OPT_NOOP) {
             ++c;
             /* NOP option. */
           } else if(opt == TCP_OPT_MSS &&
                     uip_buf[UIP_TCPIP_HLEN + UIP_LLH_LEN + 1 + c] == TCP_OPT_MSS_LEN) {
             /* An MSS option with the right option length. */
             tmp16 = (uip_buf[UIP_TCPIP_HLEN + UIP_LLH_LEN + 2 + c] << 8) |
               uip_buf[UIP_TCPIP_HLEN + UIP_LLH_LEN + 3 + c];
             uip_connr->initialmss =
               uip_connr->mss = tmp16 > UIP_TCP_MSS? UIP_TCP_MSS: tmp16;
             /* And we are done processing options. */
             break;
           } else {
             /* All other options have a length field, so that we easily
                can skip past them. */
             if(uip_buf[UIP_TCPIP_HLEN + UIP_LLH_LEN + 1 + c] == 0) {
               /* If the length field is zero, the options are malformed
                  and we don't process them further. */
               break;
+            }
             c += uip_buf[UIP_TCPIP_HLEN + UIP_LLH_LEN + 1 + c];
+          }
+        }
+      }
       uip_connr->tcpstateflags = UIP_ESTABLISHED;
       uip_connr->rcv_nxt[0] = BUF->seqno[0];
       uip_connr->rcv_nxt[1] = BUF->seqno[1];
       uip_connr->rcv_nxt[2] = BUF->seqno[2];
       uip_connr->rcv_nxt[3] = BUF->seqno[3];
       uip_add_rcv_nxt(1);
       uip_flags = UIP_CONNECTED | UIP_NEWDATA;
       uip_connr->len = 0;
       uip_len = 0;
       uip_slen = 0;
       UIP_APPCALL();
       goto appsend;
+    }
     /* Inform the application that the connection failed */
     uip_flags = UIP_ABORT;
     UIP_APPCALL();
     /* The connection is closed after we send the RST */
     uip_conn->tcpstateflags = UIP_CLOSED;
     goto reset;
 #endif /* UIP_ACTIVE_OPEN */
   case UIP_ESTABLISHED:
     /* In the ESTABLISHED state, we call upon the application to feed
     data into the uip_buf. If the UIP_ACKDATA flag is set, the
     application should put new data into the buffer, otherwise we are
     retransmitting an old segment, and the application should put that
     data into the buffer.
     If the incoming packet is a FIN, we should close the connection on
     this side as well, and we send out a FIN and enter the LAST_ACK
     state. We require that there is no outstanding data; otherwise the
     sequence numbers will be screwed up. */
     if(BUF->flags & TCP_FIN && !(uip_connr->tcpstateflags & UIP_STOPPED)) {
       if(uip_outstanding(uip_connr)) {
         goto drop;
+      }
       uip_add_rcv_nxt(1 + uip_len);
       uip_flags |= UIP_CLOSE;
       if(uip_len > 0) {
         uip_flags |= UIP_NEWDATA;
+      }
       UIP_APPCALL();
       uip_connr->len = 1;
       uip_connr->tcpstateflags = UIP_LAST_ACK;
       uip_connr->nrtx = 0;
     tcp_send_finack:
       BUF->flags = TCP_FIN | TCP_ACK;
       goto tcp_send_nodata;
+    }
     /* Check the URG flag. If this is set, the segment carries urgent
        data that we must pass to the application. */
     if((BUF->flags & TCP_URG) != 0) {
 #if UIP_URGDATA > 0
       uip_urglen = (BUF->urgp[0] << 8) | BUF->urgp[1];
       if(uip_urglen > uip_len) {
         /* There is more urgent data in the next segment to come. */
         uip_urglen = uip_len;
+      }
       uip_add_rcv_nxt(uip_urglen);
       uip_len -= uip_urglen;
       uip_urgdata = uip_appdata;
       uip_appdata += uip_urglen;
     } else {
       uip_urglen = 0;
 #else /* UIP_URGDATA > 0 */
       uip_appdata = ((char *)uip_appdata) + ((BUF->urgp[0] << 8) | BUF->urgp[1]);
       uip_len -= (BUF->urgp[0] << 8) | BUF->urgp[1];
 #endif /* UIP_URGDATA > 0 */
+    }
     /* If uip_len > 0 we have TCP data in the packet, and we flag this
        by setting the UIP_NEWDATA flag and update the sequence number
        we acknowledge. If the application has stopped the dataflow
        using uip_stop(), we must not accept any data packets from the
        remote host. */
     if(uip_len > 0 && !(uip_connr->tcpstateflags & UIP_STOPPED)) {
       uip_flags |= UIP_NEWDATA;
       uip_add_rcv_nxt(uip_len);
+    }
     /* Check if the available buffer space advertised by the other end
        is smaller than the initial MSS for this connection. If so, we
        set the current MSS to the window size to ensure that the
        application does not send more data than the other end can
        handle.
        If the remote host advertises a zero window, we set the MSS to
        the initial MSS so that the application will send an entire MSS
        of data. This data will not be acknowledged by the receiver,
        and the application will retransmit it. This is called the
        "persistent timer" and uses the retransmission mechanim.
     */
     tmp16 = ((u16_t)BUF->wnd[0] << 8) + (u16_t)BUF->wnd[1];
     if(tmp16 > uip_connr->initialmss ||
        tmp16 == 0) {
       tmp16 = uip_connr->initialmss;
+    }
     uip_connr->mss = tmp16;
     /* If this packet constitutes an ACK for outstanding data (flagged
        by the UIP_ACKDATA flag, we should call the application since it
        might want to send more data. If the incoming packet had data
        from the peer (as flagged by the UIP_NEWDATA flag), the
        application must also be notified.
        When the application is called, the global variable uip_len
        contains the length of the incoming data. The application can
        access the incoming data through the global pointer
        uip_appdata, which usually points UIP_IPTCPH_LEN + UIP_LLH_LEN
        bytes into the uip_buf array.
        If the application wishes to send any data, this data should be
        put into the uip_appdata and the length of the data should be
        put into uip_len. If the application don't have any data to
        send, uip_len must be set to 0. */
     if(uip_flags & (UIP_NEWDATA | UIP_ACKDATA)) {
       uip_slen = 0;
       UIP_APPCALL();
     appsend:
       if(uip_flags & UIP_ABORT) {
         uip_slen = 0;
         uip_connr->tcpstateflags = UIP_CLOSED;
         BUF->flags = TCP_RST | TCP_ACK;
         goto tcp_send_nodata;
+      }
       if(uip_flags & UIP_CLOSE) {
         uip_slen = 0;
         uip_connr->len = 1;
         uip_connr->tcpstateflags = UIP_FIN_WAIT_1;
         uip_connr->nrtx = 0;
         BUF->flags = TCP_FIN | TCP_ACK;
         goto tcp_send_nodata;
+      }
       /* If uip_slen > 0, the application has data to be sent. */
       if(uip_slen > 0) {
         /* If the connection has acknowledged data, the contents of
            the ->len variable should be discarded. */
         if((uip_flags & UIP_ACKDATA) != 0) {
           uip_connr->len = 0;
+        }
         /* If the ->len variable is non-zero the connection has
            already data in transit and cannot send anymore right
            now. */
         if(uip_connr->len == 0) {
           /* The application cannot send more than what is allowed by
              the mss (the minumum of the MSS and the available
              window). */
           if(uip_slen > uip_connr->mss) {
             uip_slen = uip_connr->mss;
+          }
           /* Remember how much data we send out now so that we know
              when everything has been acknowledged. */
           uip_connr->len = uip_slen;
         } else {
           /* If the application already had unacknowledged data, we
              make sure that the application does not send (i.e.,
              retransmit) out more than it previously sent out. */
           uip_slen = uip_connr->len;
+        }
+      }
       uip_connr->nrtx = 0;
     apprexmit:
       uip_appdata = uip_sappdata;
       /* If the application has data to be sent, or if the incoming
          packet had new data in it, we must send out a packet. */
       if(uip_slen > 0 && uip_connr->len > 0) {
         /* Add the length of the IP and TCP headers. */
         uip_len = uip_connr->len + UIP_TCPIP_HLEN;
         /* We always set the ACK flag in response packets. */
         BUF->flags = TCP_ACK | TCP_PSH;
         /* Send the packet. */
         goto tcp_send_noopts;
+      }
       /* If there is no data to send, just send out a pure ACK if
          there is newdata. */
       if(uip_flags & UIP_NEWDATA) {
         uip_len = UIP_TCPIP_HLEN;
         BUF->flags = TCP_ACK;
         goto tcp_send_noopts;
+      }
+    }
     goto drop;
   case UIP_LAST_ACK:
     /* We can close this connection if the peer has acknowledged our
        FIN. This is indicated by the UIP_ACKDATA flag. */
     if(uip_flags & UIP_ACKDATA) {
       uip_connr->tcpstateflags = UIP_CLOSED;
       uip_flags = UIP_CLOSE;
       UIP_APPCALL();
+    }
     break;
   case UIP_FIN_WAIT_1:
     /* The application has closed the connection, but the remote host
        hasn't closed its end yet. Thus we do nothing but wait for a
        FIN from the other side. */
     if(uip_len > 0) {
       uip_add_rcv_nxt(uip_len);
+    }
     if(BUF->flags & TCP_FIN) {
       if(uip_flags & UIP_ACKDATA) {
         uip_connr->tcpstateflags = UIP_TIME_WAIT;
         uip_connr->timer = 0;
         uip_connr->len = 0;
       } else {
         uip_connr->tcpstateflags = UIP_CLOSING;
+      }
       uip_add_rcv_nxt(1);
       uip_flags = UIP_CLOSE;
       UIP_APPCALL();
       goto tcp_send_ack;
     } else if(uip_flags & UIP_ACKDATA) {
       uip_connr->tcpstateflags = UIP_FIN_WAIT_2;
       uip_connr->len = 0;
       goto drop;
+    }
     if(uip_len > 0) {
       goto tcp_send_ack;
+    }
     goto drop;
   case UIP_FIN_WAIT_2:
     if(uip_len > 0) {
       uip_add_rcv_nxt(uip_len);
+    }
     if(BUF->flags & TCP_FIN) {
       uip_connr->tcpstateflags = UIP_TIME_WAIT;
       uip_connr->timer = 0;
       uip_add_rcv_nxt(1);
       uip_flags = UIP_CLOSE;
       UIP_APPCALL();
       goto tcp_send_ack;
+    }
     if(uip_len > 0) {
       goto tcp_send_ack;
+    }
     goto drop;
   case UIP_TIME_WAIT:
     goto tcp_send_ack;
   case UIP_CLOSING:
     if(uip_flags & UIP_ACKDATA) {
       uip_connr->tcpstateflags = UIP_TIME_WAIT;
       uip_connr->timer = 0;
+    }
+  }
   goto drop;
   /* We jump here when we are ready to send the packet, and just want
      to set the appropriate TCP sequence numbers in the TCP header. */
  tcp_send_ack:
   BUF->flags = TCP_ACK;
  tcp_send_nodata:
   uip_len = UIP_IPTCPH_LEN;
  tcp_send_noopts:
   BUF->tcpoffset = (UIP_TCPH_LEN / 4) << 4;
  tcp_send:
   /* We're done with the input processing. We are now ready to send a
      reply. Our job is to fill in all the fields of the TCP and IP
      headers before calculating the checksum and finally send the
      packet. */
   BUF->ackno[0] = uip_connr->rcv_nxt[0];
   BUF->ackno[1] = uip_connr->rcv_nxt[1];
   BUF->ackno[2] = uip_connr->rcv_nxt[2];
   BUF->ackno[3] = uip_connr->rcv_nxt[3];
   BUF->seqno[0] = uip_connr->snd_nxt[0];
   BUF->seqno[1] = uip_connr->snd_nxt[1];
   BUF->seqno[2] = uip_connr->snd_nxt[2];
   BUF->seqno[3] = uip_connr->snd_nxt[3];
   BUF->proto = UIP_PROTO_TCP;
   BUF->srcport  = uip_connr->lport;
   BUF->destport = uip_connr->rport;
   uip_ipaddr_copy(BUF->srcipaddr, uip_hostaddr);
   uip_ipaddr_copy(BUF->destipaddr, uip_connr->ripaddr);
   if(uip_connr->tcpstateflags & UIP_STOPPED) {
     /* If the connection has issued uip_stop(), we advertise a zero
        window so that the remote host will stop sending data. */
     BUF->wnd[0] = BUF->wnd[1] = 0;
   } else {
     BUF->wnd[0] = ((UIP_RECEIVE_WINDOW) >> 8);
     BUF->wnd[1] = ((UIP_RECEIVE_WINDOW) & 0xff);
+  }
  tcp_send_noconn:
   BUF->ttl = UIP_TTL;
 #if UIP_CONF_IPV6
   /* For IPv6, the IP length field does not include the IPv6 IP header
      length. */
   BUF->len[0] = ((uip_len - UIP_IPH_LEN) >> 8);
   BUF->len[1] = ((uip_len - UIP_IPH_LEN) & 0xff);
 #else /* UIP_CONF_IPV6 */
   BUF->len[0] = (uip_len >> 8);
   BUF->len[1] = (uip_len & 0xff);
 #endif /* UIP_CONF_IPV6 */
   BUF->urgp[0] = BUF->urgp[1] = 0;
   /* Calculate TCP checksum. */
   BUF->tcpchksum = 0;
   BUF->tcpchksum = ~(uip_tcpchksum());
  ip_send_nolen:
 #if UIP_CONF_IPV6
   BUF->vtc = 0x60;
   BUF->tcflow = 0x00;
   BUF->flow = 0x00;
 #else /* UIP_CONF_IPV6 */
   BUF->vhl = 0x45;
   BUF->tos = 0;
   BUF->ipoffset[0] = BUF->ipoffset[1] = 0;
   ++ipid;
   BUF->ipid[0] = ipid >> 8;
   BUF->ipid[1] = ipid & 0xff;
   /* Calculate IP checksum. */
   BUF->ipchksum = 0;
   BUF->ipchksum = ~(uip_ipchksum());
 #ifndef WIN32
   DEBUG_PRINTF("uip ip_send_nolen: chkecum 0x%04x\n", uip_ipchksum());
 #endif
 #endif /* UIP_CONF_IPV6 */
   UIP_STAT(++uip_stat.tcp.sent);
  send:
 #ifndef WIN32
   DEBUG_PRINTF("Sending packet with length %d (%d)\n", uip_len,
                (BUF->len[0] << 8) | BUF->len[1]);
 #endif
   UIP_STAT(++uip_stat.ip.sent);
   /* Return and let the caller do the actual transmission. */
   uip_flags = 0;
   return;
  drop:
   uip_len = 0;
   uip_flags = 0;
   return;
+}
 /*---------------------------------------------------------------------------*/
 u16_t
 myhtons(u16_t val)
+{
   return UIP_HTONS(val);
+}
 /*---------------------------------------------------------------------------*/
 void
 uip_send(const void *data, int len)
+{
   if(len > 0) {
     uip_slen = len;
     if(data != uip_sappdata) {
       memcpy(uip_sappdata, (data), uip_slen);
+    }
+  }
+}
 /** @} */