arch/i386-pc/exec/screen.c

   1 /*
   2     Copyright © 1995-2001, The AROS Development Team. All rights reserved.
   3     $Id$
   4 */
   5
   6 #include <strings.h>
   7 #include <stdarg.h>
   8 #include <stdlib.h>
   9 #include <string.h>
  10
  11 #undef __save_flags
  12 #undef __restore_flags
  13 #undef __cli
  14 #undef __sti
  15
  16 #define __save_flags(x)         __asm__ __volatile__("pushfl ; popl %0":"=g" (x): /* no input */)
  17 #define __restore_flags(x)      __asm__ __volatile__("pushl %0 ; popfl": /* no output */ :"g" (x):"memory", "cc")
  18 #define __cli()                 __asm__ __volatile__("cli": : :"memory")
  19 #define __sti()                 __asm__ __volatile__("sti": : :"memory")
  20
  21 static int x,y, dead;
  22
  23 struct scr
  24 {
  25     unsigned char sign;
  26     unsigned char attr;
  27 };
  28
  29 static struct scr *view = (struct scr *)0xb8000;
  30
  31 void clr()
  32 {
  33     unsigned long flags;
  34     int i;
  35
  36     __save_flags(flags);
  37     __cli();
  38
  39     if (!dead) for (i=0; i<80*25; i++)
  40     {
  41         view[i].sign = ' ';
  42         view[i].attr = 7;
  43     }
  44     x=0;
  45     y=0;
  46
  47     __restore_flags(flags);
  48 }
  49
  50 void Putc(char chr)
  51 {
  52     unsigned long flags;
  53
  54     __save_flags(flags);
  55     __cli();
  56     if (chr == 3) /* die / CTRL-C / "signal" */
  57     {
  58         dead = 1;
  59     }
  60     else if (!dead)
  61     {
  62
  63         if (chr)
  64         {
  65             if (chr == 10)
  66             {
  67                 x = 0;
  68                 y++;
  69             }
  70             else
  71             {
  72                 int i = 80*y+x;
  73                 view[i].sign = chr;
  74                 x++;
  75                 if (x == 80)
  76                 {
  77                     x = 0;
  78                     y++;
  79                 }
  80             }
  81         }
  82         if (y>24)
  83         {
  84             int i;
  85             y=24;
  86
  87             for (i=0; i<80*24; i++)
  88                 view[i].sign = view[i+80].sign;
  89             for (i=80*24; i<80*25; i++)
  90                 view[i].sign = ' ';
  91         }
  92     }
  93     __restore_flags(flags);
  94 }
  95
  96 void scr_RawPutChars(char *chr, int lim)
  97 {
  98     int i;
  99
 100     for (i=0; i<lim; i++)
 101         Putc(*chr++);
 102 }
 103