From 00d50ff9054edd3554d73c9048ac497bc42429fe Mon Sep 17 00:00:00 2001 From: Ben Pfaff Date: Tue, 20 Mar 2012 15:00:46 -0700 Subject: [PATCH] hmap: New function hmap_contains(). This is useful in a situation where one knows that an hmap_node is in some hmap, but it's not certain which one, and one needs to know whether it is in a particular one. This is not a very common case; I don't see any potential users in the current tree, although an upcoming commit will add one. Signed-off-by: Ben Pfaff --- lib/hmap.c | 17 ++++++++++++++++- lib/hmap.h | 4 +++- 2 files changed, 19 insertions(+), 2 deletions(-) diff --git a/lib/hmap.c b/lib/hmap.c index 9f2774465..5862b6278 100644 --- a/lib/hmap.c +++ b/lib/hmap.c @@ -1,5 +1,5 @@ /* - * Copyright (c) 2008, 2009, 2010 Nicira Networks. + * Copyright (c) 2008, 2009, 2010, 2012 Nicira Networks. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. @@ -261,3 +261,18 @@ hmap_at_position(const struct hmap *hmap, *offsetp = 0; return NULL; } + +/* Returns true if 'node' is in 'hmap', false otherwise. */ +bool +hmap_contains(const struct hmap *hmap, const struct hmap_node *node) +{ + struct hmap_node *p; + + for (p = hmap_first_in_bucket(hmap, node->hash); p; p = p->next) { + if (p == node) { + return true; + } + } + + return false; +} diff --git a/lib/hmap.h b/lib/hmap.h index ed2d78d34..246fba2cb 100644 --- a/lib/hmap.h +++ b/lib/hmap.h @@ -1,5 +1,5 @@ /* - * Copyright (c) 2008, 2009, 2010 Nicira Networks. + * Copyright (c) 2008, 2009, 2010, 2012 Nicira Networks. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. @@ -130,6 +130,8 @@ static inline struct hmap_node *hmap_first_in_bucket(const struct hmap *, size_t hash); static inline struct hmap_node *hmap_next_in_bucket(const struct hmap_node *); +bool hmap_contains(const struct hmap *, const struct hmap_node *); + /* Iteration. */ /* Iterates through every node in HMAP. */ -- 2.43.0