/*      $OpenBSD: varpush.c,v 1.12 2019/06/28 13:32:52 deraadt Exp $    */
/*      $NetBSD: varpush.c,v 1.4 1995/03/24 05:02:35 cgd Exp $  */

/*
 * Copyright (c) 1982, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * 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.
 */

#ifdef DEBUG
#include <err.h>
#endif
#include <errno.h>
#include <string.h>
#include <unistd.h>

#include "mille.h"

/*
 * @(#)varpush.c        1.1 (Berkeley) 4/1/82
 */

/*
 *      push variables around via the routine func() on the file
 * channel file.  func() is either read or write.
 */
bool
varpush(int file, ssize_t (*func)(int, const struct iovec *, int))
{
        int     temp;
        const struct iovec vec[] = {
                { (void *) &Debug, sizeof Debug },
                { (void *) &Finished, sizeof Finished },
                { (void *) &Order, sizeof Order },
                { (void *) &End, sizeof End },
                { (void *) &On_exit, sizeof On_exit },
                { (void *) &Handstart, sizeof Handstart },
                { (void *) &Numgos, sizeof Numgos },
                { (void *) Numseen, sizeof Numseen },
                { (void *) &Play, sizeof Play },
                { (void *) &Window, sizeof Window },
                { (void *) Deck, sizeof Deck },
                { (void *) &Discard, sizeof Discard },
                { (void *) Player, sizeof Player }
        };

        if (((func)(file, vec, sizeof(vec) / sizeof(vec[0]))) < 0) {
                error(strerror(errno));
                return FALSE;
        }

        if (func == readv) {
                if ((read(file, (void *) &temp, sizeof temp)) == -1) {
                        error(strerror(errno));
                        return FALSE;
                }
                Topcard = &Deck[temp];
#ifdef DEBUG
                if (Debug) {
                        char    buf[80];
over:
                        printf("Debug file:");
                        fgets(buf, sizeof(buf), stdin);
                        if ((outf = fopen(buf, "w")) == NULL) {
                                warn("%s", buf);
                                goto over;
                        }
                        if (strcmp(buf, "/dev/null") != 0)
                                setvbuf(outf, NULL, _IONBF, 0);
                }
#endif
        } else {
                temp = Topcard - Deck;
                if ((write(file, (void *) &temp, sizeof temp)) == -1) {
                        error(strerror(errno));
                        return FALSE;
                }
        }
        return TRUE;
}