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/* -*- c -*- ------------------------------------------------------------- *
*
* Copyright 2004 Murali Krishnan Ganapathy - All Rights Reserved
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, Inc., 53 Temple Place Ste 330,
* Bostom MA 02111-1307, USA; either version 2 of the License, or
* (at your option) any later version; incorporated herein by reference.
*
* ----------------------------------------------------------------------- */
#include "string.h"
#include "biosio.h"
static inline void asm_putchar(char x)
{
asm volatile("int $0x21" : : "a" (x + 0x0200));
}
static inline void asm_sprint(const char *str)
{
asm volatile("movb $0x09,%%ah ; int $0x21" : : "d" (str) : "eax");
}
/* BIOS Assisted output routines */
void csprint(char *str) // Print a C str (NULL terminated)
{
int o,l;
o = (long)(str) & 0xffff; // Offset of location
l = strlen(str);
str[l] = '$'; // Replace \0 with $
asm_sprint(str);
str[l] = '\0'; // Change it back.
}
void sprint(const char *str)
{
asm_sprint(str);
}
static inline void asm_cprint(char chr, char attr, int times, char disppage)
{
asm volatile("movb $0x09,%%ah ; int $0x10"
: "+a" (chr) : "b" (attr + (disppage << 8)), "c" (times));
}
void cprint(char chr,char attr,int times,char disppage)
{
asm_cprint(chr,attr,times,disppage);
}
static inline void asm_setdisppage(char num)
{
asm volatile("movb $0x05,%%ah ; int $0x10"
: "+a" (num));
}
void setdisppage(char num) // Set the display page to specified number
{
asm_setdisppage(num);
}
static inline char asm_getdisppage(void)
{
register char page asm("%bh");
asm("movb $0x0f,%%ah ; int $0x10" : "=r" (page) : : "eax");
return page;
}
char getdisppage() // Get current display page
{
return asm_getdisppage();
}
void clearwindow(char top,char left,char bot,char right, char page,char fillchar, char fillattr)
{
char x;
for (x=top; x < bot+1; x++)
{
gotoxy(x,left,page);
asm_cprint(fillchar,fillattr,right-left+1,page);
}
}
void cls(void)
{
asm_cprint(' ',0x07,25*80,getdisppage());
}
static inline void asm_gotoxy(char row,char col, char page)
{
asm volatile("movb $0x02,%%ah ; "
"int $0x10"
: : "d" ((row << 8) + col), "b" (page << 8)
: "eax");
}
void gotoxy(char row,char col, char page)
{
asm_gotoxy(row,col,page);
}
static inline void asm_getpos(char *row, char *col, char page)
{
asm("movb $0x03,%%ah ; "
"int $0x10 ; "
"movb %%dh,%0 ; "
"movb %%dl,%1"
: "=m" (*row), "=m" (*col)
: "b" (page << 8)
: "eax", "ecx", "edx");
}
void getpos(char * row, char * col, char page)
{
asm_getpos(row,col,page);
}
char asm_inputc(char *scancode)
{
unsigned short ax;
asm volatile("movb $0x10,%%ah ; "
"int $0x16"
: "=a" (ax));
if (scancode)
*scancode = (ax >> 8);
return (char)ax;
}
char inputc(char * scancode)
{
return asm_inputc(scancode);
}
void asm_cursorshape(char start, char end)
{
asm volatile("movb $0x01,%%ah ; int $0x10"
: : "c" ((start << 8) + end) : "eax");
}
void cursoroff(void)
{
asm_cursorshape(31,31);
}
void cursoron(void)
{
asm_cursorshape(6,7);
}
char bkspstr[] = " \b$";
char eolstr[] = "\n$";
static char asm_getchar(void)
{
char v;
/* Get key without echo */
asm("movb $0x08,%%ah ; int $0x21" : "=a" (v));
return v;
}
void getstring(char *str, unsigned int size)
// Reads a line of input from stdin. Replace CR with NUL byte
{
char c;
char *p = str;
while ( (c = asm_getchar()) != '\r' ) {
switch (c) {
case '\0': /* Extended char prefix */
asm_getchar(); /* Drop */
break;
case '\b':
if ( p > str ) {
p--;
sprint("\b \b$");
}
break;
case '\x15': /* Ctrl-U: kill input */
while ( p > str ) {
p--;
sprint("\b \b$");
}
break;
default:
if ( c >= ' ' && (unsigned int)(p-str) < size-1 ) {
*p++ = c;
asm_putchar(c);
}
break;
}
}
*p = '\0';
}
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