[PATCH 2/4] xwayland: Remove a useless out-of-memory check

[Marek Chalupa]

Checking for negative return value of snprintf is wrong, but snprintf can
actually "fail". It can truncate the output. However, since sizeof name is
256 and the length of "XWAYLAND%d" is always shorter that this, it is safe
here.

Reviewed-by: Marek Chalupa <mchqwerty at gmail.com>

On Tue, May 12, 2015 at 7:21 PM, Dima Ryazanov <dima at gmail.com> wrote:

> snprintf does not allocate memory, so we can never get an out-of-memory
> error.
>
> (Also, the error handler would free xwl_output after it was already
> registered
> as an event listener.)
>
> Signed-off-by: Dima Ryazanov <dima at gmail.com>
> ---
>  hw/xwayland/xwayland-output.c | 6 +-----
>  1 file changed, 1 insertion(+), 5 deletions(-)
>
> diff --git a/hw/xwayland/xwayland-output.c b/hw/xwayland/xwayland-output.c
> index 1d75d0b..4949363 100644
> --- a/hw/xwayland/xwayland-output.c
> +++ b/hw/xwayland/xwayland-output.c
> @@ -167,11 +167,7 @@ xwl_output_create(struct xwl_screen *xwl_screen,
> uint32_t id)
>                                            &wl_output_interface, 2);
>      wl_output_add_listener(xwl_output->output, &output_listener,
> xwl_output);
>
> -    if (snprintf(name, sizeof name, "XWAYLAND%d", serial++) < 0) {
> -        ErrorF("create_output ENOMEM\n");
> -        free(xwl_output);
> -        return NULL;
> -    }
> +    snprintf(name, sizeof name, "XWAYLAND%d", serial++);
>
>      xwl_output->xwl_screen = xwl_screen;
>      xwl_output->randr_crtc = RRCrtcCreate(xwl_screen->screen, xwl_output);
> --
> 2.4.0
>
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