Re: [Qemu-devel] Printing bogus values in ne2000_asic_ioport_read()/ ne2000_receive()

From: Umamaheswararao Karyampudi <kumrao2003@yahoo.com>
To: "carlo.andreoli@tiscali.it" <carlo.andreoli@tiscali.it>,
	qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] Printing bogus values in ne2000_asic_ioport_read()/ ne2000_receive()
Date: Fri, 3 Mar 2006 14:33:06 -0800 (PST)	[thread overview]
Message-ID: <20060303223306.20121.qmail@web36802.mail.mud.yahoo.com> (raw)
In-Reply-To: <23402837.1141207604525.JavaMail.root@ps19>

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Thanks Carlo. Now it works after changing it to . and Thanks all for the replies.

Uma
"carlo.andreoli@tiscali.it" <carlo.andreoli@tiscali.it> wrote: Regarding the bogus numbers occasionally printed, you can see that the 
leading
ffs are printed when the character has its bit7 set to 1. This occurs 
because in
      printf("%02x ", s[i]);
the expected argument for %02x is an integer, and since the actual 
argument is
a (signed) character, the compiler promotes it to an integer extending 
the sign bit.
You can simply write instead
      printf("%02x ", (unsigned char)s[i]);
and the problem should disappear, since in this case the promotion to 
an integer
adds non-significative 0s that are ignored when printig

Carlo

----Messaggio originale----
Da: kumrao2003@yahoo.com
Data: 25/02/2006 19.29
A: 
Ogg: [Qemu-devel] Printing bogus values in ne2000_asic_ioport_read()/ 
ne2000_receive()

Hi,
I am using QEMU in one of my research projects. I
landed in a problem where I see bogus numbers being
printed when I printed the packet/each word that is
received from ne2000.

In ne2000_receive(), I copied the packet received to a
static char [] and printed the packet using
 static void print_packet(char *s, int len)
{
  int i,j;
  for (i=0;i
      if (i%20 == 0)
          printf("\n");
      printf("%02x ", s[i]);
  }
          printf("\n");
}
And some bytes it prints as fffffffff
instead of just the last byte.
For eg:
52 54 00 12 34 56 00 ffffffff 4f 0a 46 05 08 00 45 00
00 ffffff80 00 00
40 00 40 01 ffffffbc 2b ffffffc0 ffffffa8 fffffffe
fffffffe ffffffc0 ffffffa8 ff

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