/****************************************************************************** Product:  VGA screen output* Version:  3.0* Updated:  Jan 23, 2005** Copyright (C) 2002-2005 Quantum Leaps, LLC. All rights reserved.** This software may be distributed and modified under the terms of the GNU* General Public License version 2 (GPL) as published by the Free Software* Foundation and appearing in the file GPL.TXT included in the packaging of* this file. Please note that GPL Section 2[b] requires that all works based* on this software must also be made publicly available under the terms of* the GPL ("Copyleft").** Alternatively, this software may be distributed and modified under the* terms of Quantum Leaps commercial licenses, which are designed for users* who want to retain proprietary status of their code. This "dual-licensing"* model is possible because Quantum Leaps owns the copyright to this source* code and as such can license its intelectual property any number of times.* The users who license this software under one of Quantum Leaps commercial* licenses do not use this software under the GPL and therefore are not* subject to any of its terms.** Contact information:* Quantum Leaps Web site:  http://www.quantum-leaps.com* Quantum Leaps licensing: http://www.quantum-leaps.com/licensing* Quantum Leaps products:  http://www.quantum-leaps.com/products* e-mail:                  sales@quantum-leaps.com*****************************************************************************/#include <stdint.h>#include <conio.h>#include <dos.h>#include "video.h"/*..........................................................................*/void Video_clearScreen(uint8_t bgColor) {    clrscr();    Video_clearRect(0,  0, 80, 25, bgColor);}/*..........................................................................*/void Video_clearRect(uint8_t x1, uint8_t y1, uint8_t x2, uint8_t y2,                     uint8_t bgColor){    for ( ; y1 < y2; ++y1) {        uint8_t x;        uint8_t far *pscr = (uint8_t far *)MK_FP(0xB800,                                           (uint16_t)(((y1 * 80) + x1) * 2));        for (x = x1; x < x2; ++x) {            pscr[0] = ' ';                        /* Put space in video RAM */            pscr[1] = bgColor;          /* Put video attribute in video RAM */            pscr += 2;        }    }}/*..........................................................................*/void Video_printStrAt(uint8_t x, uint8_t y, uint8_t color,                      char const *str){                               /* calculate position on the video RAM (VGA) */    uint8_t far *pscr = (uint8_t far *)MK_FP(0xB800,                                             (uint16_t)(((y * 80) + x) * 2));    while (*str != (uint8_t)0) {        pscr[0] = *str++;                     /* Put character in video RAM */        pscr[1] |= color;               /* Put video attribute in video RAM */        pscr += 2;    }}/*..........................................................................*/void Video_printNumAt(uint8_t x, uint8_t y, uint8_t color, uint32_t num) {    char buf[4];    buf[3] = (char)0;    buf[2] = (char)('0' + num % 10);    num /= 10;    buf[1] = (char)('0' + num % 10);    num /= 10;    buf[0] = (char)('0' + num % 10);    if (buf[0] == '0') {        buf[0] = ' ';    }    Video_printStrAt(x, y, color, buf);}