Added module stringmap

[ccan] / ccan / stringmap / stringmap.h

diff --git a/ccan/stringmap/stringmap.h b/ccan/stringmap/stringmap.h
new file mode 100644 (file)
index 0000000..df9fe63
--- /dev/null
+++ b/ccan/stringmap/stringmap.h
@@ -0,0 +1,71 @@
+/*
+ * Copyright (c) 2004 Anders Magnusson (ragge@ludd.luth.se).
+ * Copyright (c) 2009 Joseph Adams (joeyadams3.14159@gmail.com).
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef CCAN_STRINGMAP_H
+#define CCAN_STRINGMAP_H
+
+#include <ccan/block_pool/block_pool.h>
+#include <stdint.h>
+
+#define stringmap(theType) struct {struct stringmap t; struct {char *str; theType value;} *last;}
+       //the 'last' pointer here is used as a hacky typeof() alternative
+
+#define stringmap_new(ctx) {{0,0,(struct block_pool*)(ctx)},0}
+#define stringmap_init(sm, ctx) do { \
+               (sm).t.root = 0; \
+               (sm).t.count = 0; \
+               (sm).t.bp = (struct block_pool*)(ctx); \
+               (sm).last = 0; \
+       } while(0)
+#define stringmap_free(sm) do { \
+               if ((sm).t.root) \
+                       block_pool_free((sm).t.bp); \
+       } while(0)
+
+#define stringmap_lookup(sm, key) stringmap_le(sm, key, 0)
+#define stringmap_enter(sm, key) stringmap_le(sm, key, 1)
+
+//this macro sets sm.last so it can exploit its type
+#define stringmap_le(sm, key, enterf) ((((sm).last) = stringmap_lookup_real(&(sm).t, key, enterf, sizeof(*(sm).last))) ? &(sm).last->value : NULL)
+
+
+struct stringmap_node {
+       uint32_t bitno;
+       struct stringmap_node *lr[2];
+};
+
+struct stringmap {
+       struct stringmap_node *root;
+       size_t count;
+       struct block_pool *bp;
+       //hack: 'bp' holds talloc ctx when 'root' is NULL
+};
+
+void *stringmap_lookup_real(struct stringmap *t, const char *key, int enterf, size_t T_size);
+
+#endif