examples/serial_test.c: Don't crash if no pattern on write is given

[Uwe Bonnes <bon@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx>]

-- 
Uwe Bonnes                bon@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

Institut fuer Kernphysik  Schlossgartenstrasse 9  64289 Darmstadt
--------- Tel. 06151 162516 -------- Fax. 06151 164321 ----------
>From d278d664b042d64e08ebe5b85601f38f5425204e Mon Sep 17 00:00:00 2001
From: Uwe Bonnes <bon@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx>
Date: Mon, 5 Sep 2011 11:20:06 +0200
Subject: Don't crash if no pattern on write is given
 Exit immediate if invalid write pattern is given

---
 examples/serial_test.c |    8 ++++++--
 1 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/examples/serial_test.c b/examples/serial_test.c
index 60c5a84..46599b8 100644
--- a/examples/serial_test.c
+++ b/examples/serial_test.c
@@ -34,7 +34,7 @@ int main(int argc, char **argv)
     int baudrate = 115200;
     int interface = INTERFACE_ANY;
     int do_write = 0;
-    unsigned int pattern;
+    unsigned int pattern = 0xffff;
     int retval = EXIT_FAILURE;
 
     while ((i = getopt(argc, argv, "i:v:p:b:w::")) != -1)
@@ -55,9 +55,13 @@ int main(int argc, char **argv)
                 break;
             case 'w':
                 do_write = 1;
-                pattern = strtoul(optarg, NULL, 0);
+                if (optarg)
+                    pattern = strtoul(optarg, NULL, 0);
                 if (pattern > 0xff)
+                {
                     fprintf(stderr, "Please provide a 8 bit pattern\n");
+                    exit(-1);
+                }
                 break;
             default:
                 fprintf(stderr, "usage: %s [-i interface] [-v vid] [-p pid] 
[-b baudrate] [-w [pattern]]\n", *argv);
-- 
1.7.3.4


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