usr/src/usr.bin/make/lst.lib/lstDupl.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.
 *
 * 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by the University of
 *      California, Berkeley and its contributors.
 * 4. 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 lint
static char sccsid[] = "@(#)lstDupl.c   8.2 (Berkeley) 4/28/95";
#endif /* not lint */

/*-
 * listDupl.c --
 *      Duplicate a list. This includes duplicating the individual
 *      elements.
 */

#include    "lstInt.h"

/*-
 *-----------------------------------------------------------------------
 * Lst_Duplicate --
 *      Duplicate an entire list. If a function to copy a ClientData is
 *      given, the individual client elements will be duplicated as well.
 *
 * Results:
 *      The new Lst structure or NILLST if failure.
 *
 * Side Effects:
 *      A new list is created.
 *-----------------------------------------------------------------------
 */
Lst
Lst_Duplicate (l, copyProc)
    Lst           l;             /* the list to duplicate */
    /* A function to duplicate each ClientData */
    ClientData    (*copyProc) __P((ClientData));
{
    register Lst        nl;
    register ListNode   ln;
    register List       list = (List)l;

    if (!LstValid (l)) {
        return (NILLST);
    }

    nl = Lst_Init (list->isCirc);
    if (nl == NILLST) {
        return (NILLST);
    }

    ln = list->firstPtr;
    while (ln != NilListNode) {
        if (copyProc != NOCOPY) {
            if (Lst_AtEnd (nl, (*copyProc) (ln->datum)) == FAILURE) {
                return (NILLST);
            }
        } else if (Lst_AtEnd (nl, ln->datum) == FAILURE) {
            return (NILLST);
        }

        if (list->isCirc && ln == list->lastPtr) {
            ln = NilListNode;
        } else {
            ln = ln->nextPtr;
        }
    }

    return (nl);
}