bring in binary search tree code.

Obtained from: NetBSD

2 files changed, 68 insertions, 1 deletions

diff --git a/include/Makefile b/include/Makefile
index 4cd856e..c6fd25e 100644
--- a/include/Makefile
+++ b/include/Makefile
@@ -14,7 +14,8 @@ FILES=	a.out.h ar.h assert.h bitstring.h ctype.h db.h dirent.h disktab.h \
 	limits.h link.h locale.h malloc.h memory.h mpool.h \
 	ndbm.h netdb.h nl_types.h nlist.h objformat.h \
 	paths.h pthread.h pthread_np.h pwd.h \
-	ranlib.h regex.h regexp.h resolv.h rune.h runetype.h setjmp.h sgtty.h \
+	ranlib.h regex.h regexp.h resolv.h rune.h runetype.h \
+	search.h setjmp.h sgtty.h \
 	signal.h stab.h stddef.h stdio.h stdlib.h string.h stringlist.h \
 	strings.h struct.h sysexits.h tar.h time.h timers.h \
 	ttyent.h unistd.h utime.h utmp.h vis.h
diff --git a/include/search.h b/include/search.h
new file mode 100644
index 0000000..c72b16f
--- /dev/null
+++ b/include/search.h
@@ -0,0 +1,66 @@
+/*	$NetBSD: search.h,v 1.12 1999/02/22 10:34:28 christos Exp $	*/
+/* $FreeBSD$ */
+
+/*
+ * Written by J.T. Conklin <jtc@netbsd.org>
+ * Public domain.
+ */
+
+#ifndef _SEARCH_H_
+#define _SEARCH_H_
+
+#include <sys/cdefs.h>
+#include <machine/ansi.h>
+
+#ifdef	_BSD_SIZE_T_
+typedef	_BSD_SIZE_T_	size_t;
+#undef	_BSD_SIZE_T_
+#endif
+
+typedef struct entry {
+	char *key;
+	void *data;
+} ENTRY;
+
+typedef enum {
+	FIND, ENTER
+} ACTION;
+
+typedef enum {
+	preorder,
+	postorder,
+	endorder,
+	leaf
+} VISIT;
+
+#ifdef _SEARCH_PRIVATE
+typedef struct node {
+	char         *key;
+	struct node  *llink, *rlink;
+} node_t;
+#endif
+
+__BEGIN_DECLS
+void	*bsearch __P((const void *, const void *, size_t, size_t,
+		      int (*)(const void *, const void *)));
+int	 hcreate __P((size_t));
+void	 hdestroy __P((void));
+ENTRY	*hsearch __P((ENTRY, ACTION));
+
+void	*lfind __P((const void *, const void *, size_t *, size_t,
+		      int (*)(const void *, const void *)));
+void	*lsearch __P((const void *, const void *, size_t *, size_t,
+		      int (*)(const void *, const void *)));
+void	 insque __P((void *, void *));
+void	 remque __P((void *));
+
+void	*tdelete __P((const void *, void **,
+		      int (*)(const void *, const void *)));
+void	*tfind __P((const void *, void **,
+		      int (*)(const void *, const void *)));
+void	*tsearch __P((const void *, void **, 
+		      int (*)(const void *, const void *)));
+void      twalk __P((const void *, void (*)(const void *, VISIT, int)));
+__END_DECLS
+
+#endif /* !_SEARCH_H_ */