Re: [Qemu-devel] [PATCH 5/9] tests/libqos/usb: Clean up string interpolation into QMP input

[Eric Blake]

On 07/21/2017 08:53 AM, Markus Armbruster wrote:
> Leaving interpolation into JSON to qmp() is more robust than building
> QMP input manually, as explained in the previous commit.
> 
> The case in usb_test_hotplug() slightly more complicated: it

s/()/() is/

> interpolates *into* JSON values.  Clean it up by building the values
> separately, so we can again leave interpolation to qmp().
> 
> Signed-off-by: Markus Armbruster <address@hidden>
> ---
>  tests/libqos/usb.c | 30 ++++++++++++++----------------
>  1 file changed, 14 insertions(+), 16 deletions(-)
> 
> diff --git a/tests/libqos/usb.c b/tests/libqos/usb.c
> index 0cdfaec..f88d4a6 100644
> --- a/tests/libqos/usb.c
> +++ b/tests/libqos/usb.c
> @@ -40,18 +40,20 @@ void uhci_port_test(struct qhc *hc, int port, uint16_t 
> expect)
>  void usb_test_hotplug(const char *hcd_id, const int port,
>                        void (*port_check)(void))
>  {
> +    char id[32];
> +    char *bus;
>      QDict *response;
> -    char  *cmd;
>  
> -    cmd = g_strdup_printf("{'execute': 'device_add',"
> -                          " 'arguments': {"
> -                          "   'driver': 'usb-tablet',"
> -                          "   'port': '%d',"
> -                          "   'bus': '%s.0',"
> -                          "   'id': 'usbdev%d'"
> -                          "}}", port, hcd_id, port);
> -    response = qmp(cmd);
> -    g_free(cmd);
> +    sprintf(id, "usbdev%d", port);

I know this fits, but do any of our compilers issue dumb warnings about
possible buffer overflow?  I guess we'll deal with that if someone
reports a problem.

Reviewed-by: Eric Blake <address@hidden>

-- 
Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3266
Virtualization:  qemu.org | libvirt.org

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