From mboxrd@z Thu Jan  1 00:00:00 1970
From: Asias He <asias.hejun@gmail.com>
Subject: Re: [PATCH] kvm tools: Sanitize output characters in serial console
Date: Wed, 10 Aug 2011 13:43:14 +0800
Message-ID: <4E421A72.9080203@gmail.com>
References: <1312934218-32666-1-git-send-email-asias.hejun@gmail.com> <4E421784.2020703@kernel.org>
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Cc: Cyrill Gorcunov <gorcunov@gmail.com>, Ingo Molnar <mingo@elte.hu>,
	Sasha Levin <levinsasha928@gmail.com>,
	Prasad Joshi <prasadjoshi124@gmail.com>, kvm@vger.kernel.org
To: Pekka Enberg <penberg@kernel.org>
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On 08/10/2011 01:30 PM, Pekka Enberg wrote:
> On 8/10/11 2:56 AM, Asias He wrote:
>> This patch fixes strange characters in serial console.
>>
>> Before:
>>
>> [    0.448000] Serial: 8250/16550 driver, 4 ports, IRQ sharing enabl=
ed
>> =EF=BF=BD[    0.695000] serial8250: ttyS0 at I/O 0x3f8 (irq =3D 0) i=
s a 16550A
>> =EF=BF=BD[    0.942000] serial8250: ttyS1 at I/O 0x2f8 (irq =3D 0) i=
s a 16550A
>> =EF=BF=BD[    1.189000] serial8250: ttyS2 at I/O 0x3e8 (irq =3D 0) i=
s a 16550A
>> [    1.194000] Non-volatile memory driver v1.3
>>
>> After:
>>
>> [    0.541000] Serial: 8250/16550 driver, 4 ports, IRQ sharing enabl=
ed
>> [    0.788000] serial8250: ttyS0 at I/O 0x3f8 (irq =3D 0) is a 16550=
A
>> [    1.041000] serial8250: ttyS1 at I/O 0x2f8 (irq =3D 0) is a 16550=
A
>> [    1.294000] serial8250: ttyS2 at I/O 0x3e8 (irq =3D 0) is a 16550=
A
>> [    1.309000] Non-volatile memory driver v1.3
>>
>> Signed-off-by: Asias He<asias.hejun@gmail.com>
>> ---
>>   tools/kvm/term.c |    7 +++++--
>>   1 files changed, 5 insertions(+), 2 deletions(-)
>>
>> diff --git a/tools/kvm/term.c b/tools/kvm/term.c
>> index 2a3e1f0..85b41e7 100644
>> --- a/tools/kvm/term.c
>> +++ b/tools/kvm/term.c
>> @@ -5,6 +5,7 @@
>>   #include<unistd.h>
>>   #include<sys/uio.h>
>>   #include<signal.h>
>> +#include<ctype.h>
>>
>>   #include "kvm/read-write.h"
>>   #include "kvm/term.h"
>> @@ -57,8 +58,10 @@ int term_putc(int who, char *addr, int cnt)
>>       if (who !=3D active_console)
>>           return -1;
>>
>> -    while (cnt--)
>> -        fprintf(stdout, "%c", *addr++);
>> +    while (cnt--) {
>> +        if (isascii(*addr))
>=20
> Do things like backspace still work with this?

Sure. Have a try ;-)

http://en.wikipedia.org/wiki/ASCII

>=20
>> +            fprintf(stdout, "%c", *addr++);
>> +    }
>>
>>       fflush(stdout);
>>       return cnt;
>=20
>=20


--=20
Best Regards,
Asias He