/*
 * Copyright (c) 1999-2003 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * Portions Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights
 * Reserved.  This file contains Original Code and/or Modifications of
 * Original Code as defined in and that are subject to the Apple Public
 * Source License Version 2.0 (the "License").  You may not use this file
 * except in compliance with the License.  Please obtain a copy of the
 * License at http://www.apple.com/publicsource and read it before using
 * this file.
 * 
 * The Original Code and all software distributed under the License are
 * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE OR NON- INFRINGEMENT.  Please see the
 * License for the specific language governing rights and limitations
 * under the License.
 * 
 * @APPLE_LICENSE_HEADER_END@
 */
/*
 * Copyright 1993 NeXT, Inc.
 * All rights reserved.
 */

#include "boot.h"
#include "bootstruct.h"

/* NOTE: Extremely stripped down boot2/graphics.c containing only text-mode activity spinner */

/*
 * for spinning disk
 */
static int currentIndicator = 0;

//==========================================================================
// Return the current video mode, VGA_TEXT_MODE or GRAPHICS_MODE.

int getVideoMode(void)
{
    return bootArgs->Video.v_display;
}

//==========================================================================
// Display and clear the activity indicator.

static char indicator[] = {'-', '\\', '|', '/', '-', '\\', '|', '/', '\0'};
#define kNumIndicators (sizeof(indicator) - 1)

// To prevent a ridiculously fast-spinning indicator,
// ensure a minimum of 1/9 sec between animation frames.
#define MIN_TICKS 2

void
spinActivityIndicator( void )
{
    static unsigned long lastTickTime = 0;
    unsigned long        currentTickTime = time18();
    static char          string[3] = {'\0', '\b', '\0'};
    
    if (currentTickTime < lastTickTime + MIN_TICKS)
        return;
    else
        lastTickTime = currentTickTime;

    if ( getVideoMode() == VGA_TEXT_MODE )
    {
        if (currentIndicator >= kNumIndicators) currentIndicator = 0;
        string[0] = indicator[currentIndicator++];
        printf(string);
    }
}

void
clearActivityIndicator( void )
{
    if ( getVideoMode() == VGA_TEXT_MODE )
    {
        printf(" \b");
    }
}