Re: [Qemu-devel] [PATCH 1/3] qdev: Add help for device properties

[Markus Armbruster <armbru@redhat.com>]

Stefan Weil <weil@mail.berlios.de> writes:

> When called with property "?", a list of supported
> properties will be printed (instead of an error message).
>
> This is useful for command lines like
> 	qemu -device e1000,?
> and was already standard for other options like model=?
>
> Signed-off-by: Stefan Weil <weil@mail.berlios.de>
> ---
>  hw/qdev-properties.c |   15 +++++++++++++--
>  1 files changed, 13 insertions(+), 2 deletions(-)
>
> diff --git a/hw/qdev-properties.c b/hw/qdev-properties.c
> index 277ff9e..8547ad2 100644
> --- a/hw/qdev-properties.c
> +++ b/hw/qdev-properties.c
> @@ -544,8 +544,19 @@ int qdev_prop_parse(DeviceState *dev, const char *name, const char *value)
>  
>      prop = qdev_prop_find(dev, name);
>      if (!prop) {
> -        fprintf(stderr, "property \"%s.%s\" not found\n",
> -                dev->info->name, name);
> +        if (strcmp(name, "?") != 0) {
> +            fprintf(stderr, "property \"%s.%s\" not found\n",
> +                    dev->info->name, name);
> +        } else {
> +            fprintf(stderr, "supported properties:\n");
> +            if (dev->info->props != NULL) {
> +                Property *props = dev->info->props;
> +                while (props->name) {
> +                    fprintf(stderr, "%s.%s\n", dev->info->name, props->name);
> +                    props++;
> +                }
> +            }
> +        }
>          return -1;
>      }
>      if (!prop->info->parse) {

I like it.