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/tdelete.c | 67 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 67 insertions(+)
 create mode 100644 newlib/libc/search/tdelete.c

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

diff --git a/newlib/libc/search/tdelete.c b/newlib/libc/search/tdelete.c
new file mode 100644
index 000000000..e849ada81
--- /dev/null
+++ b/newlib/libc/search/tdelete.c
@@ -0,0 +1,67 @@
+/*	$NetBSD: tdelete.c,v 1.2 1999/09/16 11:45:37 lukem 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: tdelete.c,v 1.2 1999/09/16 11:45:37 lukem Exp $");
+#endif /* LIBC_SCCS and not lint */
+#endif
+
+#include <assert.h>
+#define _SEARCH_PRIVATE
+#include <search.h>
+#include <stdlib.h>
+
+
+/* delete node with given key */
+void *
+tdelete(vkey, vrootp, compar)
+	const void *vkey;	/* key to be deleted */
+	void      **vrootp;	/* address of the root of tree */
+	int       (*compar)(const void *, const void *);
+{
+	node_t **rootp = (node_t **)vrootp;
+	node_t *p, *q, *r;
+	int  cmp;
+
+	if (rootp == NULL || (p = *rootp) == NULL)
+		return NULL;
+
+	while ((cmp = (*compar)(vkey, (*rootp)->key)) != 0) {
+		p = *rootp;
+		rootp = (cmp < 0) ?
+		    &(*rootp)->llink :		/* follow llink branch */
+		    &(*rootp)->rlink;		/* follow rlink branch */
+		if (*rootp == NULL)
+			return NULL;		/* key not found */
+	}
+	r = (*rootp)->rlink;			/* D1: */
+	if ((q = (*rootp)->llink) == NULL)	/* Left NULL? */
+		q = r;
+	else if (r != NULL) {			/* Right link is NULL? */
+		if (r->llink == NULL) {		/* D2: Find successor */
+			r->llink = q;
+			q = r;
+		} else {			/* D3: Find NULL link */
+			for (q = r->llink; q->llink != NULL; q = r->llink)
+				r = q;
+			r->llink = q->rlink;
+			q->llink = (*rootp)->llink;
+			q->rlink = (*rootp)->rlink;
+		}
+	}
+	free(*rootp);				/* D4: Free node */
+	*rootp = q;				/* link parent to new node */
+	return p;
+}
-- 
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