C Implementation of the TI's GPL RAND function

gistfile1.c

static uint16_t seed;

/* RAND: Generate an 8-bit pseudo-random number */
uint8_t gpl_rand(uint8_t divisor) {
    /* Update the seed */
    seed = ((uint32_t)(seed * 0x6fe5) & 0xffff) + 0x7ab9;

    /* Swap bytes, and compute modulus */
    return ((((seed & 0xff00) >> 8 ) | ((seed & 0x00ff) << 8 )) % (!divisor ? 1 : divisor));
}