1 files changed, 77 insertions, 0 deletions
diff --git a/20120831/lst.lib/lstFirst.c b/20120831/lst.lib/lstFirst.c
new file mode 100644
index 0000000..4e8334f
--- /dev/null
+++ b/20120831/lst.lib/lstFirst.c
@@ -0,0 +1,77 @@
+/*	$NetBSD: lstFirst.c,v 1.12 2008/12/13 15:19:29 dsl Exp $	*/
+
+/*
+ * Copyright (c) 1988, 1989, 1990, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Adam de Boor.
+ *
+ * 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. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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 MAKE_NATIVE
+static char rcsid[] = "$NetBSD: lstFirst.c,v 1.12 2008/12/13 15:19:29 dsl Exp $";
+#else
+#include <sys/cdefs.h>
+#ifndef lint
+#if 0
+static char sccsid[] = "@(#)lstFirst.c	8.1 (Berkeley) 6/6/93";
+#else
+__RCSID("$NetBSD: lstFirst.c,v 1.12 2008/12/13 15:19:29 dsl Exp $");
+#endif
+#endif /* not lint */
+#endif
+
+/*-
+ * LstFirst.c --
+ *	Return the first node of a list
+ */
+
+#include	"lstInt.h"
+
+/*-
+ *-----------------------------------------------------------------------
+ * Lst_First --
+ *	Return the first node on the given list.
+ *
+ * Results:
+ *	The first node or NULL if the list is empty.
+ *
+ * Side Effects:
+ *	None.
+ *
+ *-----------------------------------------------------------------------
+ */
+LstNode
+Lst_First(Lst l)
+{
+    if (!LstValid (l) || LstIsEmpty (l)) {
+	return NULL;
+    } else {
+	return (l->firstPtr);
+    }
+}
+