[Skiboot] [PATCH V3 1/3] core/device: Add function to return child node using name at substring "@"

[Mahesh J Salgaonkar]

On 2023-02-16 13:38:57 Thu, Athira Rajeev wrote:
> Add a function dt_find_by_name_substr() that returns the child node if
> it matches till first occurence at "@" of a given name, otherwise NULL.
> This is helpful for cases with node name like: "name at addr". In
> scenarios where nodes are added with "name at addr" format and if the
> value of "addr" is not known, that node can't be matched with node
> name or addr. Hence matching with substring as node name will return
> the expected result. Patch adds dt_find_by_name_substr() function
> and testcase for the same in core/test/run-device.c
> 
> Signed-off-by: Athira Rajeev <atrajeev at linux.vnet.ibm.com>
> ---
[...]
> diff --git a/core/device.c b/core/device.c
> index 2de37c74..26562235 100644
> --- a/core/device.c
> +++ b/core/device.c
> @@ -395,6 +395,41 @@ struct dt_node *dt_find_by_name(struct dt_node *root, const char *name)
>  }
>  
>  
> +struct dt_node *dt_find_by_name_substr(struct dt_node *root, const char *name)
> +{
> +	struct dt_node *child, *match;
> +	char *node, *child_node = NULL;
> +

> +	node = malloc(strlen(name) + 1);
> +	if (!node)
> +		return NULL;
> +	memcpy(node, name, strlen(name));
> +	node[strlen(name)] = '\0';

You may want to use strdup() which does exactly what you trying to do:

	node = strdup(name);
	if (!node)
		return NULL;

> +	node = strtok(node, "@");
> +	list_for_each(&root->children, child, list) {

> +		child_node = malloc(strlen(child->name) + 1);
> +		if (!child_node)
> +			goto err;
> +		memcpy(child_node, child->name, strlen(child->name));
> +		child_node[strlen(child->name)] = '\0';

same here ^^^

Rest looks fine to me.

Reviewed-by: Mahesh Salgaonkar <mahesh at linux.ibm.com>

Thanks,
-Mahesh.