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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-27 10:41:58 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-27 10:41:58 +0000
commit1852910ef0fd7393da62b88aee66ee092208748e (patch)
treead3b659dbbe622b58a5bda4fe0b5e1d80eee9277 /lib/generic/set.h
parentInitial commit. (diff)
downloadknot-resolver-1852910ef0fd7393da62b88aee66ee092208748e.tar.xz
knot-resolver-1852910ef0fd7393da62b88aee66ee092208748e.zip
Adding upstream version 5.3.1.upstream/5.3.1upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'lib/generic/set.h')
-rw-r--r--lib/generic/set.h93
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diff --git a/lib/generic/set.h b/lib/generic/set.h
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+/* Copyright (C) 2015-2017 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+/**
+ * @file set.h
+ * @brief A set abstraction implemented on top of map.
+ *
+ * @note The API is based on map.h, see it for more examples.
+ *
+ * # Example usage:
+ *
+ * @code{.c}
+ * set_t set = set_make(NULL);
+ *
+ * // Insert keys
+ * if (set_add(&set, "princess") != 0 ||
+ * set_add(&set, "prince") != 0 ||
+ * set_add(&set, "leia") != 0) {
+ * fail();
+ * }
+ *
+ * // Test membership
+ * if (set_contains(&set, "leia")) {
+ * success();
+ * }
+ *
+ * // Prefix search
+ * int i = 0;
+ * int count(const char *s, void *n) { (*(int *)n)++; return 0; }
+ * if (set_walk_prefixed(set, "princ", count, &i) == 0) {
+ * printf("%d matches\n", i);
+ * }
+ *
+ * // Delete
+ * if (set_del(&set, "badkey") != 0) {
+ * fail(); // No such key
+ * }
+ *
+ * // Clear the set
+ * set_clear(&set);
+ * @endcode
+ *
+ * \addtogroup generics
+ * @{
+ */
+
+#pragma once
+
+#include <stddef.h>
+#include "map.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef map_t set_t;
+typedef int (set_walk_cb)(const char *, void *);
+
+/*! Creates an new, empty critbit set */
+#define set_make \
+ map_make
+
+/*! Returns non-zero if set contains str */
+#define set_contains(set, str) \
+ map_contains((set), (str))
+
+/*! Inserts str into set. Returns 0 if new, 1 if already present, or ENOMEM. */
+#define set_add(set, str) \
+ map_set((set), (str), (void *)1)
+
+/*! Deletes str from the set, returns 0 on suceess */
+#define set_del(set, str) \
+ map_del((set), (str))
+
+/*! Clears the given set */
+#define set_clear(set) \
+ map_clear(set)
+
+/*! Calls callback for all strings in map */
+#define set_walk(set, callback, baton) \
+ map_walk_prefixed((set), "", (callback), (baton))
+
+/*! Calls callback for all strings in set with the given prefix */
+#define set_walk_prefixed(set, prefix, callback, baton) \
+ map_walk_prefixed((set), (prefix), (callback), (baton))
+
+
+#ifdef __cplusplus
+}
+#endif
+
+/** @} */