Re: [PATCH v3 02/25] util: virtypedparam: Use proper enum type for all switch() statements

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On Wed, Apr 19, 2023 at 03:08:03PM +0200, Peter Krempa wrote:
On Wed, Apr 19, 2023 at 15:02:34 +0200, Martin Kletzander wrote:
On Wed, Apr 19, 2023 at 02:04:19PM +0200, Peter Krempa wrote:
> Ensure that all switch statements in this module use the proper type in
> switch() statements to ensure complier protections.
>
> Signed-off-by: Peter Krempa <pkrempa@xxxxxxxxxx>
> ---
> src/util/virtypedparam.c | 12 ++++++++----
> 1 file changed, 8 insertions(+), 4 deletions(-)
>
> diff --git a/src/util/virtypedparam.c b/src/util/virtypedparam.c
> index 0cca16053d..974ec51a79 100644
> --- a/src/util/virtypedparam.c
> +++ b/src/util/virtypedparam.c
> @@ -170,7 +170,7 @@ virTypedParameterToString(virTypedParameterPtr param)
> {
>     char *value = NULL;
>
> -    switch (param->type) {
> +    switch ((virTypedParameterType) param->type) {
>     case VIR_TYPED_PARAM_INT:
>         value = g_strdup_printf("%d", param->value.i);
>         break;
> @@ -192,6 +192,7 @@ virTypedParameterToString(virTypedParameterPtr param)
>     case VIR_TYPED_PARAM_STRING:
>         value = g_strdup(param->value.s);
>         break;
> +    case VIR_TYPED_PARAM_LAST:
>     default:

To ensure compiler protection in switch() statements you should also
remove the default case from the switch statements.

It actually works properly even with the 'default' case being present.
Additionally in case a caller passes in something which is not actually
a proper enum value (e.g. by typecasting) the 'default' case will be
applied.


Oh, good to know, TIL then.  In the meantime I replied as well =)

In many new places we already do it like this.


With that changed:

Reviewed-by: Martin Kletzander <mkletzan@xxxxxxxxxx>


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