cls.c

一个经典操作系统源码

#include "type.h"
#include "const.h"
#include "protect.h"
#include "string.h"
#include "proc.h"
#include "tty.h"
#include "console.h"
#include "global.h"
#include "keyboard.h"
#include "proto.h"
int sys_cls()
{
    CONSOLE* p=(CONSOLE *)&console_table[nr_current_console];
    t_8 * p_vmem=(t_8 *)(V_MEM_BASE+p->original_addr*2);
    while(p_vmem-(t_8 *)(V_MEM_BASE+p->original_addr)<p->v_mem_limit*2)
    {
        *p_vmem++=' ';
        *p_vmem++=DEFAULT_CHAR_COLOR;
    }
    p->cursor=p->current_start_addr=p->original_addr;
    flush(p);
    return 0;
}