Fix a error the telnet driver read method. Don't return if only protocol stuff is read

git-svn-id: https://nuttx.svn.sourceforge.net/svnroot/nuttx/trunk@4352 7fd9a85b-ad96-42d3-883c-3090e2eb8679

apps/netutils/telnetd/telnetd_daemon.c

@@ -160,7 +160,10 @@ static int telnetd_daemon(int argc, char *argv[])
       goto errout_with_socket;
     }
 
-  /* Now go silent */
+  /* Now go silent.  Only the lldbg family of debug functions should
+   * be used after this point because these do not depend on stdout
+   * being available.
+   */
 
 #ifndef CONFIG_DEBUG
   close(0);
@@ -172,13 +175,13 @@ static int telnetd_daemon(int argc, char *argv[])
 
   for (;;)
     {
-      nvdbg("Accepting connections on port %d\n", ntohs(daemon->port));
+      nllvdbg("Accepting connections on port %d\n", ntohs(daemon->port));
 
       addrlen = sizeof(struct sockaddr_in);
       acceptsd = accept(listensd, (struct sockaddr*)&myaddr, &addrlen);
       if (acceptsd < 0)
         {
-          ndbg("accept failed: %d\n", errno);
+          nlldbg("accept failed: %d\n", errno);
           goto errout_with_socket;
         }
 
@@ -189,28 +192,28 @@ static int telnetd_daemon(int argc, char *argv[])
       ling.l_linger = 30;     /* timeout is seconds */
       if (setsockopt(acceptsd, SOL_SOCKET, SO_LINGER, &ling, sizeof(struct linger)) < 0)
         {
-          ndbg("setsockopt failed: %d\n", errno);
+          nlldbg("setsockopt failed: %d\n", errno);
           goto errout_with_acceptsd;
         }
 #endif
 
       /* Create a character device to "wrap" the accepted socket descriptor */
 
-      nvdbg("Creating the telnet driver\n");
+      nllvdbg("Creating the telnet driver\n");
       devpath = telnetd_driver(acceptsd, daemon);
       if (devpath < 0)
         {
-          ndbg("telnetd_driver failed\n");
+          nlldbg("telnetd_driver failed\n");
           goto errout_with_acceptsd;
         }
 
       /* Open the driver */
 
-      nvdbg("Opening the telnet driver\n");
+      nllvdbg("Opening the telnet driver\n");
       drvrfd = open(devpath, O_RDWR);
       if (drvrfd < 0)
         {
-          ndbg("Failed to open %s: %d\n", devpath, errno);
+          nlldbg("Failed to open %s: %d\n", devpath, errno);
           goto errout_with_acceptsd;
         }
 
@@ -235,12 +238,12 @@ static int telnetd_daemon(int argc, char *argv[])
        * will inherit the new stdin, stdout, and stderr.
        */
 
-      nvdbg("Starting the telnet session\n");
+      nllvdbg("Starting the telnet session\n");
       pid = TASK_CREATE("Telnet session", daemon->priority, daemon->stacksize,
                          daemon->entry, NULL);
       if (pid < 0)
         {
-          ndbg("Failed start the telnet session: %d\n", errno);
+          nlldbg("Failed start the telnet session: %d\n", errno);
           goto errout_with_acceptsd;
         }
 

apps/netutils/telnetd/telnetd_driver.c

@@ -508,29 +508,36 @@ static ssize_t telnetd_read(FAR struct file *filep, FAR char *buffer, size_t len
   nllvdbg("len: %d\n", len);
 
   /* First, handle the case where there are still valid bytes left in the
-   * I/O buffer from the last time that read was called.
+   * I/O buffer from the last time that read was called.  NOTE:  Much of
+   * what we read may be protocol stuff and may not correspond to user
+   * data.  Hence we need the loop and we need may need to call psock_recv()
+   * multiple times in order to get data that the client is interested in.
    */
 
-  if (priv->td_pending > 0)
+  do
     {
-      FAR const char *src = &priv->td_rxbuffer[priv->td_offset];
-      ret = telnetd_receive(priv, src, priv->td_pending, buffer, len);
-    }
-
-  /* Read a buffer of data from the telnet client */
-
-  else
-    {
-      ret = psock_recv(&priv->td_psock, priv->td_rxbuffer,
-                      CONFIG_TELNETD_RXBUFFER_SIZE, 0);
-      if (ret > 0)
+      if (priv->td_pending > 0)
         {
-          /* Process the received telnet data */
+          FAR const char *src = &priv->td_rxbuffer[priv->td_offset];
+          ret = telnetd_receive(priv, src, priv->td_pending, buffer, len);
+        }
 
-          telnetd_dumpbuffer("Received buffer", priv->td_rxbuffer, ret);
-          ret = telnetd_receive(priv, priv->td_rxbuffer, ret, buffer, len);
-       }
+      /* Read a buffer of data from the telnet client */
+
+      else
+        {
+          ret = psock_recv(&priv->td_psock, priv->td_rxbuffer,
+                          CONFIG_TELNETD_RXBUFFER_SIZE, 0);
+          if (ret > 0)
+            {
+              /* Process the received telnet data */
+
+              telnetd_dumpbuffer("Received buffer", priv->td_rxbuffer, ret);
+              ret = telnetd_receive(priv, priv->td_rxbuffer, ret, buffer, len);
+           }
+        }
     }
+  while (ret == 0);
 
   return ret;
 }

nuttx/lib/stdio/lib_fgets.c

@@ -1,8 +1,8 @@
 /****************************************************************************
  * lib/stdio/lib_fgets.c
  *
- *   Copyright (C) 2007, 2008, 2011 Gregory Nutt. All rights reserved.
- *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+ *   Copyright (C) 2007-2008, 2011-2012 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions