[PATCH 5/5] cmd: Convert part uuid to use cmd_result

[Simon Glass]

Hi Sean,

On Sun, 28 Feb 2021 at 16:47, Sean Anderson <seanga2 at gmail.com> wrote:
>
> This is fairly straightforward. This allows
>         part uuid mmc 0 foo
> To be rewritten as
>         env set foo $(part uuid mmc 0)
> or even (if the variable is not required to be environmental)
>         foo=$(part uuid mmc 0)
>
> Signed-off-by: Sean Anderson <seanga2 at gmail.com>
> ---
>
>  cmd/part.c | 18 ++++++++++++++----
>  1 file changed, 14 insertions(+), 4 deletions(-)
>
> diff --git a/cmd/part.c b/cmd/part.c
> index 3395c17b89..97e70d79ff 100644
> --- a/cmd/part.c
> +++ b/cmd/part.c
> @@ -19,9 +19,12 @@
>  #include <config.h>
>  #include <command.h>
>  #include <env.h>
> +#include <malloc.h>
>  #include <part.h>
>  #include <vsprintf.h>
>
> +DECLARE_GLOBAL_DATA_PTR;
> +
>  enum cmd_part_info {
>         CMD_PART_INFO_START = 0,
>         CMD_PART_INFO_SIZE,
> @@ -43,12 +46,19 @@ static int do_part_uuid(int argc, char *const argv[])
>         if (part < 0)
>                 return 1;
>
> -       if (argc > 2)
> +       if (argc > 2) {
>                 env_set(argv[2], info.uuid);
> -       else
> -               printf("%s\n", info.uuid);
> +       } else {
> +               size_t result_size = sizeof(info.uuid) + 1;
>
> -       return 0;
> +               gd->cmd_result = malloc(result_size);
> +               if (!gd->cmd_result)
> +                       return CMD_RET_FAILURE;
> +
> +               snprintf(gd->cmd_result, result_size, "%s\n", info.uuid);
> +       }
> +
> +       return CMD_RET_SUCCESS;

I suppose I prefer 0 to CMD_RET_SUCCESS, since 0 is the universal
success code in U-Boot, and using the enum obscures that a bit. But I
don't feel strongly about it.

Regards,
Simon