#include <windows.h>
#include <msvcrt/ctype.h>
#include <msvcrt/direct.h>
#include <msvcrt/stdlib.h>

int cur_drive = 0;

int _chdrive( int drive )
{
	char d[3];
	if (!( drive >= 1 && drive <= 26 ))
		return -1;

	if ( cur_drive != drive ) {
		cur_drive = drive;
		d[0] = toupper(cur_drive + '@');
		d[1] = ':';
		d[2] = 0;
		SetCurrentDirectoryA(d);
	}

	return 0;
}