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//
// Copyright(C) 2005-2014 Simon Howard
//
// 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; either version 2
// of the License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
//
// Text mode I/O functions, similar to C stdio
//
#include <stdlib.h>
#include <string.h>
#include "txt_io.h"
#include "txt_main.h"
static int cur_x = 0, cur_y = 0;
static txt_color_t fgcolor = TXT_COLOR_GREY;
static txt_color_t bgcolor = TXT_COLOR_BLACK;
static void NewLine(unsigned char *screendata)
{
int i;
unsigned char *p;
cur_x = 0;
++cur_y;
if (cur_y >= TXT_SCREEN_H)
{
// Scroll the screen up
cur_y = TXT_SCREEN_H - 1;
memcpy(screendata, screendata + TXT_SCREEN_W * 2,
TXT_SCREEN_W * 2 * (TXT_SCREEN_H -1));
// Clear the bottom line
p = screendata + (TXT_SCREEN_H - 1) * 2 * TXT_SCREEN_W;
for (i=0; i<TXT_SCREEN_W; ++i)
{
*p++ = ' ';
*p++ = fgcolor | (bgcolor << 4);
}
}
}
static void PutChar(unsigned char *screendata, int c)
{
unsigned char *p;
p = screendata + cur_y * TXT_SCREEN_W * 2 + cur_x * 2;
switch (c)
{
case '\n':
NewLine(screendata);
break;
case '\b':
// backspace
--cur_x;
if (cur_x < 0)
cur_x = 0;
break;
default:
// Add a new character to the buffer
p[0] = c;
p[1] = fgcolor | (bgcolor << 4);
++cur_x;
if (cur_x >= TXT_SCREEN_W)
{
NewLine(screendata);
}
break;
}
}
void TXT_PutChar(int c)
{
unsigned char *screen;
screen = TXT_GetScreenData();
PutChar(screen, c);
}
void TXT_Puts(const char *s)
{
unsigned char *screen;
const char *p;
screen = TXT_GetScreenData();
for (p=s; *p != '\0'; ++p)
{
PutChar(screen, *p);
}
PutChar(screen, '\n');
}
void TXT_GotoXY(int x, int y)
{
cur_x = x;
cur_y = y;
}
void TXT_GetXY(int *x, int *y)
{
*x = cur_x;
*y = cur_y;
}
void TXT_FGColor(txt_color_t color)
{
fgcolor = color;
}
void TXT_BGColor(int color, int blinking)
{
bgcolor = color;
if (blinking)
bgcolor |= TXT_COLOR_BLINKING;
}
void TXT_SaveColors(txt_saved_colors_t *save)
{
save->bgcolor = bgcolor;
save->fgcolor = fgcolor;
}
void TXT_RestoreColors(txt_saved_colors_t *save)
{
bgcolor = save->bgcolor;
fgcolor = save->fgcolor;
}
void TXT_ClearScreen(void)
{
unsigned char *screen;
int i;
screen = TXT_GetScreenData();
for (i=0; i<TXT_SCREEN_W * TXT_SCREEN_H; ++i)
{
screen[i * 2] = ' ';
screen[i * 2 + 1] = (bgcolor << 4) | fgcolor;
}
cur_x = 0;
cur_y = 0;
}
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