Arduino Processing functions in C

#include <avr/io.h>
#include <util/delay.h>

enum
{
    HIGH = 1,
    LOW  = 0,
};

enum
{
    OUTPUT = 1,
    INPUT  = 0,
};

void pinMode(int pin, int mode);
void digitalWrite(int pin, int mode);
int digitalRead(int pin);

int main (void)
{
    pinMode(13, OUTPUT);

    while(1)
    {
        digitalWrite(13, HIGH);
        _delay_ms(250);

        digitalWrite(13, LOW);
        _delay_ms(250);
    }

return 0;
}

void pinMode(int pin, int mode)
{
    if( (pin >= 0) && (pin < 8) )       //PORTD
    {
        mode ? (DDRD |= _BV(pin)) : (DDRD &= ~_BV(pin));
    }
    else if( (pin > 7) && (pin < 14) )  //PORTB
    {
        pin -= 8;
        mode ? (DDRB |= _BV(pin)) : (DDRB &= ~_BV(pin));
    }
}

void digitalWrite(int pin, int mode)
{
    if( (pin >= 0) && (pin < 8) )       //PORTD
    {
        mode ? (PORTD |= _BV(pin)) : (PORTD &= ~_BV(pin));
    }
    else if( (pin > 7) && (pin < 14) )  //PORTB
    {
        pin -= 8;
        mode ? (PORTB |= _BV(pin)) : (PORTB &= ~_BV(pin));
    }
}

int digitalRead(int pin)
{
    if( (pin >= 0) && (pin < 8) )       //PIND
    {
        return (PIND & _BV(pin));
    }
    else if( (pin > 7) && (pin < 14) )  //PINB
    {
        return (PINB & _BV(pin - 8));
    }
    return LOW;
}