Fix a readline bug. If a NUL is received, it would return end-of-file

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@5633 42af7a65-404d-4744-a932-0658087f49c3

1 files changed, 4 insertions, 5 deletions

diff --git a/apps/examples/usbterm/usbterm_main.c b/apps/examples/usbterm/usbterm_main.c
index 69301dfcd..747a52978 100644
--- a/apps/examples/usbterm/usbterm_main.c
+++ b/apps/examples/usbterm/usbterm_main.c
@@ -1,7 +1,7 @@
 /****************************************************************************
  * examples/usbterm/usbterm_main.c
  *
- *   Copyright (C) 2011-2012 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2011-2013 Gregory Nutt. All rights reserved.
  *   Author: Gregory Nutt <gnutt@nuttx.org>
  *
  * Redistribution and use in source and binary forms, with or without
@@ -325,12 +325,11 @@ int usbterm_main(int argc, char *argv[])
       ret = readline(g_usbterm.outbuffer, CONFIG_EXAMPLES_USBTERM_BUFLEN, stdin, stdout);
 
       /* Readline normally returns the number of characters read,
-       * but will return 0 on end of file or a negative value
-       * if an error occurs.  Either will cause the session to
-       * terminate.
+       * but will return EOF on end of file or if an error occurs.  Either
+       * will cause the session to terminate.
        */
 
-      if (ret <= 0)
+      if (ret == EOF)
         {
           printf("ERROR: readline failed: %d\n", ret);
           return 1;