usr/src/usr.bin/make/lst.lib/lstSucc.c

/*
 * 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.
 *
 * %sccs.include.redist.c%
 */

#ifndef lint
static char sccsid[] = "@(#)lstSucc.c   8.1 (Berkeley) %G%";
#endif /* not lint */

/*-
 * LstSucc.c --
 *      return the successor to a given node
 */

#include        "lstInt.h"

/*-
 *-----------------------------------------------------------------------
 * Lst_Succ --
 *      Return the sucessor to the given node on its list.
 *
 * Results:
 *      The successor of the node, if it exists (note that on a circular
 *      list, if the node is the only one in the list, it is its own
 *      successor).
 *
 * Side Effects:
 *      None.
 *
 *-----------------------------------------------------------------------
 */
LstNode
Lst_Succ (ln)
    LstNode     ln;
{
    if (ln == NILLNODE) {
        return (NILLNODE);
    } else {
        return ((LstNode) ((ListNode) ln)->nextPtr);
    }
}