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/* -*- c -*- ------------------------------------------------------------- *
*
* Copyright 2004-2005 Murali Krishnan Ganapathy - All Rights Reserved
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, Inc., 53 Temple Place Ste 330,
* Boston MA 02111-1307, USA; either version 2 of the License, or
* (at your option) any later version; incorporated herein by reference.
*
* ----------------------------------------------------------------------- */
#include <string.h>
#include <com32.h>
#include "com32io.h"
#include "tui.h"
#include "syslnx.h"
com32sys_t inreg, outreg; // Global register sets for use
/**
* cprint_vga2ansi - given a VGA attribute, print a character
* @chr: character to print
* @attr: vga attribute
*
* Convert the VGA attribute @attr to an ANSI escape sequence and
* print it.
**/
static void cprint_vga2ansi(const char chr, const char attr)
{
static const char ansi_char[8] = "04261537";
static uint8_t last_attr = 0x07;
char buf[16], *p;
if (attr != last_attr) {
p = buf;
*p++ = '\033';
*p++ = '[';
/* Beware! Do not use '1': this will reset all attributes off,
* including the background color - as a result, the background
* would be black after the highlight area <X> */
if (last_attr & ~attr & 0x88) {
*p++ = '2';
*p++ = '2';
*p++ = ';';
}
if (attr & 0x08) {
*p++ = '1';
*p++ = ';';
}
if (attr & 0x80) {
*p++ = '4';
*p++ = ';';
}
if ((attr ^ last_attr) & 0x07) {
*p++ = '3';
*p++ = ansi_char[attr & 7];
*p++ = ';';
}
if ((attr ^ last_attr) & 0x70) {
*p++ = '4';
*p++ = ansi_char[(attr >> 4) & 7];
*p++ = ';';
}
p[-1] = 'm'; /* We'll have generated at least one semicolon */
p[0] = '\0';
last_attr = attr;
fputs(buf, stdout);
}
putchar(chr);
}
/**
* cprint - given a VGA attribute, print a single character at cursor
* @chr: character to print
* @attr: VGA attribute
* @times: number of times to print @chr
*
* Note: @attr is a VGA attribute.
**/
void cprint(const char chr, const char attr, unsigned int times)
{
while (times--)
cprint_vga2ansi(chr, attr);
}
/**
* csprint - given a VGA attribute, print a NULL-terminated string
* @str: string to print
* @attr: VGA attribute
**/
void csprint(const char *str, const char attr)
{
while (*str) {
cprint(*str, attr, 1);
str++;
}
}
/**
* clearwindow - fill a given a region on the screen
* @top, @left, @bot, @right: coordinates to fill
* @fillchar: character to use to fill the region
* @fillattr: character attribute (VGA)
**/
void clearwindow(const char top, const char left, const char bot,
const char right, const char fillchar, const char fillattr)
{
char x;
for (x = top; x < bot + 1; x++) {
gotoxy(x, left);
cprint(fillchar, fillattr, right - left + 1);
}
}
void getpos(char *row, char *col, char page)
{
REG_AH(inreg) = 0x03;
REG_BH(inreg) = page;
__intcall(0x10, &inreg, &outreg);
*row = REG_DH(outreg);
*col = REG_DL(outreg);
}
unsigned char sleep(unsigned int msec)
{
unsigned long micro = 1000 * msec;
REG_AH(inreg) = 0x86;
REG_CX(inreg) = (micro >> 16);
REG_DX(inreg) = (micro & 0xFFFF);
__intcall(0x15, &inreg, &outreg);
return REG_AH(outreg);
}
void scrollupwindow(char top, char left, char bot, char right, char attr,
char numlines)
{
REG_AH(inreg) = 0x06;
REG_AL(inreg) = numlines;
REG_BH(inreg) = attr; // Attribute to write blanks lines
REG_DX(inreg) = (bot << 8) + right; // BOT RIGHT corner of window
REG_CX(inreg) = (top << 8) + left; // TOP LEFT of window
__intcall(0x10, &inreg, &outreg);
}
char inputc(char *scancode)
{
syslinux_idle(); /* So syslinux can perform periodic activity */
REG_AH(inreg) = 0x10;
__intcall(0x16, &inreg, &outreg);
if (scancode)
*scancode = REG_AH(outreg);
return REG_AL(outreg);
}
void getcursorshape(char *start, char *end)
{
char page = 0; // XXX TODO
REG_AH(inreg) = 0x03;
REG_BH(inreg) = page;
__intcall(0x10, &inreg, &outreg);
*start = REG_CH(outreg);
*end = REG_CL(outreg);
}
void setcursorshape(char start, char end)
{
REG_AH(inreg) = 0x01;
REG_CH(inreg) = start;
REG_CL(inreg) = end;
__intcall(0x10, &inreg, &outreg);
}
void setvideomode(char mode)
{
REG_AH(inreg) = 0x00;
REG_AL(inreg) = mode;
__intcall(0x10, &inreg, &outreg);
}
unsigned char checkkbdbuf()
{
REG_AH(inreg) = 0x11;
__intcall(0x16, &inreg, &outreg);
return !(outreg.eflags.l & EFLAGS_ZF);
}
// Get char displayed at current position
unsigned char getcharat(char page)
{
REG_AH(inreg) = 0x08;
REG_BH(inreg) = page;
__intcall(0x16, &inreg, &outreg);
return REG_AL(outreg);
}
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