/*      $NetBSD: twiddle.c,v 1.9 2020/09/29 00:13:12 simonb Exp $       */

/*-
* Copyright (c) 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.
*
*      @(#)printf.c    8.1 (Berkeley) 6/11/93
*/

#include <sys/cdefs.h>
#include <sys/types.h>

#include "stand.h"

#define TWIDDLE_CHARS   "|/-\\"

char    twiddle_toggle;

#ifdef LIBSA_SLOW_TWIDDLE
#define TWIDDLE_DELAY   4
#else
#define TWIDDLE_DELAY   0
#endif

#define TWIDDLE_MASK    ((1 << TWIDDLE_DELAY) - 1)

void
twiddle(void)
{
       static unsigned int pos;

       if (!twiddle_toggle) {
               if ((pos & TWIDDLE_MASK) == 0) {
                       putchar(TWIDDLE_CHARS[(pos >> TWIDDLE_DELAY) & 3]);
                       putchar('\b');
               }
               pos++;
       }
}