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