[DTrace-devel] [PATCH v2 14/20] Add dt_list_length()

[Eugene Loh]

Reviewed-by: Eugene Loh <eugene.loh at oracle.com>

On 6/3/21 11:17 AM, Kris Van Hees wrote:
> Implement a function dt_list_length() to determine the number of
> elements in a list.
>
> Signed-off-by: Kris Van Hees <kris.van.hees at oracle.com>
> ---
>   libdtrace/dt_list.c | 14 +++++++++++++-
>   libdtrace/dt_list.h |  3 ++-
>   2 files changed, 15 insertions(+), 2 deletions(-)
>
> diff --git a/libdtrace/dt_list.c b/libdtrace/dt_list.c
> index 0f3855f9..32b5ea5c 100644
> --- a/libdtrace/dt_list.c
> +++ b/libdtrace/dt_list.c
> @@ -1,6 +1,6 @@
>   /*
>    * Oracle Linux DTrace.
> - * Copyright (c) 2003, Oracle and/or its affiliates. All rights reserved.
> + * Copyright (c) 2003, 2021, Oracle and/or its affiliates. All rights reserved.
>    * Licensed under the Universal Permissive License v 1.0 as shown at
>    * http://oss.oracle.com/licenses/upl.
>    */
> @@ -88,3 +88,15 @@ dt_list_delete(dt_list_t *dlp, void *existing)
>   	else
>   		dlp->dl_prev = p->dl_prev;
>   }
> +
> +size_t
> +dt_list_length(dt_list_t *dlp)
> +{
> +	dt_list_t	*p;
> +	size_t		len = 0;
> +
> +	for (p = dt_list_next(dlp); p != NULL; p = dt_list_next(p))
> +		len++;
> +
> +	return len;
> +}
> diff --git a/libdtrace/dt_list.h b/libdtrace/dt_list.h
> index 49b290f5..e6d4c863 100644
> --- a/libdtrace/dt_list.h
> +++ b/libdtrace/dt_list.h
> @@ -1,6 +1,6 @@
>   /*
>    * Oracle Linux DTrace.
> - * Copyright (c) 2003, Oracle and/or its affiliates. All rights reserved.
> + * Copyright (c) 2003, 2021, Oracle and/or its affiliates. All rights reserved.
>    * Licensed under the Universal Permissive License v 1.0 as shown at
>    * http://oss.oracle.com/licenses/upl.
>    */
> @@ -26,6 +26,7 @@ extern void dt_list_append(dt_list_t *, void *);
>   extern void dt_list_prepend(dt_list_t *, void *);
>   extern void dt_list_insert(dt_list_t *, void *, void *);
>   extern void dt_list_delete(dt_list_t *, void *);
> +extern size_t dt_list_length(dt_list_t *);
>   
>   #ifdef	__cplusplus
>   }