arch/all-native/bootconsole/screen_text.c

   1 /*
   2     Copyright © 1995-2011, The AROS Development Team. All rights reserved.
   3     $Id$
   4
   5     Desc: Hardware text mode (IBM-compatible) screen console.
   6 */
   7
   8 #include <bootconsole.h>
   9
  10 #include "console.h"
  11
  12 struct scr
  13 {
  14     unsigned char sign;
  15     unsigned char attr;
  16 };
  17
  18 /*
  19  * There's no init function for text mode console.
  20  * Just set scr_Framebuffer, scr_Width and scr_Height and you are ready to go.
  21  */
  22
  23 void txt_Clear()
  24 {
  25     struct scr *view = scr_FrameBuffer;
  26     unsigned int i;
  27
  28     scr_XPos = 0;
  29     scr_YPos = 0;
  30
  31     for (i = 0; i < scr_Width * scr_Height; i++)
  32     {
  33         view[i].sign = ' ';
  34         view[i].attr = 7;
  35     }
  36 }
  37
  38 void txt_Putc(char chr)
  39 {
  40     struct scr *view = scr_FrameBuffer;
  41     unsigned int i;
  42
  43     /* Ignore null bytes, they are output by formatting routines as terminators */
  44     if (chr == 0)
  45         return;
  46
  47     /* Reached end of line ? New line if so. */
  48     if ((chr == '\n') || (scr_XPos >= scr_Width))
  49     {
  50         scr_XPos = 0;
  51         scr_YPos++;
  52     }
  53
  54     if (scr_YPos >= scr_Height)
  55     {
  56         scr_YPos = scr_Height - 1;
  57
  58         for (i = 0; i < scr_Width * scr_YPos; i++)
  59             view[i].sign = view[i+80].sign;
  60         for (i = scr_Width * scr_YPos; i < scr_Width * scr_Height; i++)
  61             view[i].sign = ' ';
  62     }
  63
  64     if (chr == '\n')
  65         return;
  66
  67     i = 80 * scr_YPos + scr_XPos;
  68     view[i].sign = chr;
  69     scr_XPos++;
  70 }