c.c

计算机启动例子代码

          /**************************************************/
          /**/         int  g_x=0, g_y=0;                 /**/
          /**/         char g_color=0x31;                 /**/
          /**/ void kputc(char c,char color,int x,int y); /**/
          /**/         void setcolor(char );              /**/
          /**/         void newline();                    /**/
          /**/         void show(char *);                 /**/
          /**/         void clear();                      /**/
          /**/         void delay();                      /**/
          /**************************************************/

                    /***************************/
                    /*      System Entry       */
                    /***************************/
             
                 void c()
                {
                   int color;
                   dead:
                   if(color>=15)
                   color=color-15;
                    
                   if(color==0)color++;

                   setcolor(color++);


                   setcolor(color++);

                   show(
"                  Thanks Snow,my love! Suport me forever                 "
                       );
                   newline();                    

                   goto dead;

                   while(1);

                  }



/*****************************************************************************/
/*****************************************************************************/

/* delay about 0.5 sec*/
void delay()
{
  int i=10000;
  int j=1000;
  for(i=0;i<10000;i++)
  {
    for(j=0;j<10;j++)
    {;}
  }
}


/*
* Clear screen in text mode 80x25
*/

void clear()
{
 int x=0,y=0;
 setcolor(0);
 for(;x<25;x++)
  {
    
    for(y=0;y<80;y++)
      kputc(0,0,x,y);
  }
} 


/* Set corrent color*/

void setcolor(char color)
{
  g_color=color;
}

/* genarete new line */
void newline()
{
 if(g_x>=10)
   g_x=0;
 else
  g_x++;
 
g_y=0;
}


/* 
* Show str in screen corrent pos
*/
void show(char *str)
{
  int i=0;
  
  while(str[i] != 0)
   {
     if(str[i]!=' ')
       delay();
       if(g_color>=15)
          g_color-=15;
       if(g_color==0)
          g_color++;
   
       g_color++;
    
       kputc(str[i++],g_color,g_x,g_y++);
   }

}



/* 
  Text mode kprint
  
  Show 'c' at 
  line : x (0...24 )
  col  : y (0...79 )

*/
void kputc(char c,char color,int x,int y)
{
 /* p ponitor to Video Memory  */

 char *p = (char*)0xb8000;
 
 /* calc line pos*/
 p += 2*x*80+y*2;
 
 /* show char whith color*/

 *p = c;
 


 *(p+1) = color;

}