os/kernel/vga_err.c

/**
 * \file 
*/

#include <cpu/ports.h>
#include <string.h>

#define VGA_BLACK 0 //!< The color black
#define VGA_WHITE 15 //!< The color white
static char* screen; //!< Pointer to VGA screen memory
static int x=0; //!< Next character offset in VGA sreen memory

/**
 * Set a character on the screen
 * \param x The character index to set
 * \param c The character to write 
*/
static void set_char(int x,char c) {
  screen[x*2]=c;
  screen[x*2+1]=(VGA_BLACK<<4)|VGA_WHITE;
}

void vga_init(char* addr) {
  screen=addr;
}

void vga_write_string(const char* string) {
  for (size_t i=0;i<strlen(string);i++) {
    if (string[i]=='\n') continue;
    set_char(x,string[i]);
    x++;
  }
}