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authorErlang/OTP <[email protected]>2009-11-20 14:54:40 +0000
committerErlang/OTP <[email protected]>2009-11-20 14:54:40 +0000
commit84adefa331c4159d432d22840663c38f155cd4c1 (patch)
treebff9a9c66adda4df2106dfd0e5c053ab182a12bd /lib/erl_interface/src/registry/hash_rlookup.c
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The R13B03 release.OTP_R13B03
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diff --git a/lib/erl_interface/src/registry/hash_rlookup.c b/lib/erl_interface/src/registry/hash_rlookup.c
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+/*
+ * %CopyrightBegin%
+ *
+ * Copyright Ericsson AB 1998-2009. All Rights Reserved.
+ *
+ * The contents of this file are subject to the Erlang Public License,
+ * Version 1.1, (the "License"); you may not use this file except in
+ * compliance with the License. You should have received a copy of the
+ * Erlang Public License along with this software. If not, it can be
+ * retrieved online at http://www.erlang.org/.
+ *
+ * Software distributed under the License is distributed on an "AS IS"
+ * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
+ * the License for the specific language governing rights and limitations
+ * under the License.
+ *
+ * %CopyrightEnd%
+ *
+
+ */
+#include <stdlib.h>
+#include "hash.h"
+
+/* this function does a reverse lookup and returns the first key whose
+ * value matches value. This operation may be lengthy! Also, there is
+ * no guarantee that the *values* are unique in the hash table, so the
+ * returned key might not be the one you expect.
+ */
+const char *ei_hash_rlookup(ei_hash *tab, const void *value)
+{
+ ei_bucket *b;
+ int i;
+
+ for (i=0; i<tab->size; i++) {
+ b=tab->tab[i];
+ while (b) {
+ if (b->value == value) return b->key;
+ b = b->next;
+ }
+ }
+ return NULL;
+}
+