Re: [PATCH] kvm tools: Sanitize output characters in serial console

[Pekka Enberg <penberg@kernel.org>]

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 enabled
> �[    0.695000] serial8250: ttyS0 at I/O 0x3f8 (irq = 0) is a 16550A
> �[    0.942000] serial8250: ttyS1 at I/O 0x2f8 (irq = 0) is a 16550A
> �[    1.189000] serial8250: ttyS2 at I/O 0x3e8 (irq = 0) is a 16550A
> [    1.194000] Non-volatile memory driver v1.3
>
> After:
>
> [    0.541000] Serial: 8250/16550 driver, 4 ports, IRQ sharing enabled
> [    0.788000] serial8250: ttyS0 at I/O 0x3f8 (irq = 0) is a 16550A
> [    1.041000] serial8250: ttyS1 at I/O 0x2f8 (irq = 0) is a 16550A
> [    1.294000] serial8250: ttyS2 at I/O 0x3e8 (irq = 0) is a 16550A
> [    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 != active_console)
>   		return -1;
>
> -	while (cnt--)
> -		fprintf(stdout, "%c", *addr++);
> +	while (cnt--) {
> +		if (isascii(*addr))

Do things like backspace still work with this?

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