16x4 lcd busy flag not working

sbit rs=P1^0;							 
sbit rw=P1^1;
sbit E=P1^2;
sbit d4=P1^4;
sbit d5=P1^5;			  
sbit d6=P1^6;
sbit lcd_st=P1^7;


void init_lcd()
{
	delay(15);
	command_write(0x03);
	delay(5);

	command_write(0x03);
	delay(5);

	command_write(0x03);
	delay(5);

	command_write(0x02);
	delay(5);

	command_write(0x28);
	delay(5);
	
	command_write(0x01);
	delay(5);

	command_write(0x0c);
	delay(5);
}

void data_map(unsigned char ds)
{
unsigned char ab;
	ab=ds;
	P1=P1&0x0f;
	ab=ab&0xf0;
	P1=ab|P1;
}


void command_write(unsigned char c_dt)
{
	lcd_status();
	rs=0;
	rw=0;
	data_map(c_dt);
	enable();
	lcd_status();
	rs=0;
	rw=0;
	c_dt=c_dt<<4;
	data_map(c_dt);
	enable();	
	
}


void data_write(unsigned char d_dt)
{
	lcd_status();
	rs=1;
	rw=0;
	data_map(d_dt);
	enable();
	lcd_status();
	rs=1;
	rw=0;
	d_dt=d_dt<<4;
	data_map(d_dt);
	enable();
}

void lcd_status()
{
	unsigned char temm;
	E = 0;
	lcd_st = 1;
	rs = 0;
	rw = 1;
	do
	{
		enable();
	}
	while(lcd_st==1);
	rw = 0;
	E = 0;
}

void delay (unsigned int val)
{
unsigned int n,m;
	for(n=0;n<val;n++)
		for(m=0;m<=120;m++);
}

void enable()
{
	E	=1;
	delay_us(15);
	E = 0;
}

void print(unsigned char *ptr,unsigned char addr)
{
	command_write(addr);
//	lcd_status();
	while(!(*ptr=='\0'))
	{
		data_write(*ptr++);
//		lcd_status();
	}
}