DOS系统调用

[c]代码库

#include <stdio.h>
#include <dos.h>

/* Get current drive as 'A', 'B', ... */
char current_drive ( void )
{
	char curdrive;

	/* Get current disk as 0, 1, ... */
	curdrive = bdos ( 0x19, 0, 0 );
	return ( 'A' + curdrive );
}

int main ( void )
{
	printf ( "The current drive is %c:\n", current_drive() );
	return 0;
}