From a7b23a8f11b2e1f2ef333d2ed95d1c972acad12f Mon Sep 17 00:00:00 2001
From: Thomas Fitzsimmons <fitzsim@redhat.com>
Date: Thu, 20 Jun 2002 19:51:40 +0000
Subject: 	* Makefile.am (LIB_OBJECTLISTS): Add 
 libc/search/objectlist.awk.in. 	* libc/Makefile.am (SUBDIRS): Add
 search. 	(SUBLIBS): Add search/libsearch.la. 	* libc/configure.in
 (AC_OUTPUT): Add search/Makefile. 	* libc/search: New directory. 	*
 libc/search/Makefile.am: New file. 	* libc/search/extern.h: New file. 
 * libc/search/hash.c: New file. 	* libc/search/hash.h: New file. 
 * libc/search/hash_bigkey.c: New file. 	* libc/search/hash_buf.c: New
 file. 	* libc/search/hash_func.c: New file. 	* libc/search/hash_log2.c: New
 file. 	* libc/search/hash_page.c: New file. 	* libc/search/hcreate.3: New
 file. 	* libc/search/hcreate.c: New file. 	* libc/search/hcreate.c~: New
 file. 	* libc/search/hcreate_r.c: New file. 	* libc/search/ndbm.c: New
 file. 	* libc/search/page.h: New file. 	* libc/search/tdelete.c: New
 file. 	* libc/search/tdestroy.c: New file. 	* libc/search/tfind.c: New
 file. 	* libc/search/tsearch.3: New file. 	* libc/search/tsearch.c: New
 file. 	* libc/search/twalk.c: New file. 	* libc/include/db.h: New file.
 	* libc/include/ndbm.h: New file. 	* libc/include/search.h: New
 file. 	* libc/include/sys/queue.h: New file. 	* libc/include/sys/cdefs.h:
 New file. 	* libc/include/sys/param.h 
 [__IEEE_LITTLE_ENDIAN,__IEEE_BIG_ENDIAN]: Set BYTE_ORDER to 	LITTLE_ENDIAN
 or BIG_ENDIAN. 	* libc/include/sys/errno.h (EFTYPE): New macro. 
 * libc/search/bsearch.c: Move from libc/stdlib. 	* libc/search/qsort.c:
 Likewise. 	* libc/stdlib/Makefile.am (LIB_SOURCES): Remove bsearch.c and 
 qsort.c. 	(CHEWOUT_FILES): Remove bsearch.def and qsort.def. 	*
 libc/stdlib/stdlib.tex: Remove references to bsearch and qsort.

---
 newlib/libc/search/twalk.c | 58 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 58 insertions(+)
 create mode 100644 newlib/libc/search/twalk.c

(limited to 'newlib/libc/search/twalk.c')

diff --git a/newlib/libc/search/twalk.c b/newlib/libc/search/twalk.c
new file mode 100644
index 000000000..020e5d5ea
--- /dev/null
+++ b/newlib/libc/search/twalk.c
@@ -0,0 +1,58 @@
+/*	$NetBSD: twalk.c,v 1.1 1999/02/22 10:33:16 christos Exp $	*/
+
+/*
+ * Tree search generalized from Knuth (6.2.2) Algorithm T just like
+ * the AT&T man page says.
+ *
+ * The node_t structure is for internal use only, lint doesn't grok it.
+ *
+ * Written by reading the System V Interface Definition, not the code.
+ *
+ * Totally public domain.
+ */
+
+#include <sys/cdefs.h>
+#if 0
+#if defined(LIBC_SCCS) && !defined(lint)
+__RCSID("$NetBSD: twalk.c,v 1.1 1999/02/22 10:33:16 christos Exp $");
+#endif /* LIBC_SCCS and not lint */
+#endif
+
+#include <assert.h>
+#define _SEARCH_PRIVATE
+#include <search.h>
+#include <stdlib.h>
+
+static void trecurse(const node_t *,
+    void (*action)(const void *, VISIT, int), int level);
+
+/* Walk the nodes of a tree */
+static void
+trecurse(root, action, level)
+	const node_t *root;	/* Root of the tree to be walked */
+	void (*action)(const void *, VISIT, int);
+	int level;
+{
+
+	if (root->llink == NULL && root->rlink == NULL)
+		(*action)(root, leaf, level);
+	else {
+		(*action)(root, preorder, level);
+		if (root->llink != NULL)
+			trecurse(root->llink, action, level + 1);
+		(*action)(root, postorder, level);
+		if (root->rlink != NULL)
+			trecurse(root->rlink, action, level + 1);
+		(*action)(root, endorder, level);
+	}
+}
+
+/* Walk the nodes of a tree */
+void
+twalk(vroot, action)
+	const void *vroot;	/* Root of the tree to be walked */
+	void (*action)(const void *, VISIT, int);
+{
+	if (vroot != NULL && action != NULL)
+		trecurse(vroot, action, 0);
+}
-- 
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