/*      $NetBSD: terminal.c,v 1.8 2021/05/02 12:50:45 rillig Exp $      */
/*
 * Copyright (c) 1983-2003, 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:
 *
 * + Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * + 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.
 * + Neither the name of the University of California, San Francisco 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 COPYRIGHT HOLDERS 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 COPYRIGHT
 * OWNER 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.
 */

#include <sys/cdefs.h>
#ifndef lint
__RCSID("$NetBSD: terminal.c,v 1.8 2021/05/02 12:50:45 rillig Exp $");
#endif /* not lint */

#include <stdarg.h>
#include "hunt.h"
#define TERM_WIDTH      80      /* Assume terminals are 80-char wide */

/*
 * cgoto:
 *      Move the cursor to the given position on the given player's
 *      terminal.
 */
void
cgoto(PLAYER *pp, int y, int x)
{
        if (x == pp->p_curx && y == pp->p_cury)
                return;
        sendcom(pp, MOVE, y, x);
        pp->p_cury = y;
        pp->p_curx = x;
}

/*
 * outch:
 *      Put out a single character.
 */
void
outch(PLAYER *pp, int ch)
{
        if (++pp->p_curx >= TERM_WIDTH) {
                pp->p_curx = 0;
                pp->p_cury++;
        }
        (void) putc(ch, pp->p_output);
}

/*
 * outstr:
 *      Put out a string of the given length.
 */
void
outstr(PLAYER *pp, const char *str, int len)
{
        pp->p_curx += len;
        pp->p_cury += (pp->p_curx / TERM_WIDTH);
        pp->p_curx %= TERM_WIDTH;
        while (len--)
                (void) putc(*str++, pp->p_output);
}

/*
 * clrscr:
 *      Clear the screen, and reset the current position on the screen.
 */
void
clrscr(PLAYER *pp)
{
        sendcom(pp, CLEAR);
        pp->p_cury = 0;
        pp->p_curx = 0;
}

/*
 * ce:
 *      Clear to the end of the line
 */
void
ce(PLAYER *pp)
{
        sendcom(pp, CLRTOEOL);
}

#if 0           /* XXX lukem */
/*
 * ref;
 *      Refresh the screen
 */
void
ref(PLAYER *pp)
{
        sendcom(pp, REFRESH);
}
#endif

/*
 * sendcom:
 *      Send a command to the given user
 */
void
sendcom(PLAYER *pp, int command, ...)
{
        va_list ap;
        int arg1, arg2;

        va_start(ap, command);
        (void) putc(command, pp->p_output);
        switch (command & 0377) {
        case MOVE:
                arg1 = va_arg(ap, int);
                arg2 = va_arg(ap, int);
                (void) putc(arg1, pp->p_output);
                (void) putc(arg2, pp->p_output);
                break;
        case ADDCH:
        case READY:
                arg1 = va_arg(ap, int);
                (void) putc(arg1, pp->p_output);
                break;
        }

        va_end(ap);             /* No return needed for void functions. */
}