Re: [PATCH] test_power: add missing newlines when printing parameters by sysfs

[Joe Perches <joe@perches.com>]

On Mon, 2020-10-05 at 01:30 +0000, Harley A.W. Lorenzo wrote:
> Here is the updated patch using sprintf, diffing from the original patch by Xiongfeng Wang.
> 
> [PATCH] test_power: revise parameter printing to use sprintf
> 
> Signed-off-by: Harley A.W. Lorenzo <hl1998@protonmail.com>
> Suggested-by: Joe Perches <joe@perches.com>

I did not suggest this.

> diff --git a/drivers/power/supply/test_power.c b/drivers/power/supply/test_power.c
[]
> @@ -352,8 +352,8 @@ static int param_set_ac_online(const char *key, const struct kernel_param *kp)
> 
>  static int param_get_ac_online(char *buffer, const struct kernel_param *kp)
>  {.
> -	strcpy(buffer, map_get_key(map_ac_online, ac_online, "unknown"));
> -	strcat(buffer, "\n");
> +	char const *out = map_get_key(map_ac_online, ac_online, "unknown");
> +	sprintf(buffer, "%s\n", out);
>  	return strlen(buffer);
>  }

No temporary is necessary nor is strlen as
that's the same as the return from sprintf.

All of these should be similar to:

static int param_get_ac_online(char *buffer, const struct kernel_param *kp)
{
	return sprintf(buffer, "%s\n",
		       map_get_key(map_ac_online, ac_online, "unknown"));
}