Client server modelling in C

Answer 1

/**

* Return the byte of DHCP option data.

*

* @param client DHCP client.

* @param ptr pointer obtained by dhcp_get_option_ptr().

*

* @return byte value at the given address.

*/

static u8_t dhcp_get_option_byte(u8_t *ptr)

{

LWIP_DEBUGF(DHCP_DEBUG, ("option byte value=%"U16_F"\n", (u16_t)(*ptr)));

return *ptr;

}

#if 0

/**

* Return the 16-bit value of DHCP option data.

*

* @param client DHCP client.

* @param ptr pointer obtained by dhcp_get_option_ptr().

*

* @return byte value at the given address.

*/

static u16_t dhcp_get_option_short(u8_t *ptr)

{

u16_t value;

value = *ptr++ << 8;

value |= *ptr;

LWIP_DEBUGF(DHCP_DEBUG, ("option short value=%"U16_F"\n", value));

return value;

}

#endif

/**

* Return the 32-bit value of DHCP option data.

*

* @param client DHCP client.

* @param ptr pointer obtained by dhcp_get_option_ptr().

*

* @return byte value at the given address.

*/

static u32_t dhcp_get_option_long(u8_t *ptr)

{

u32_t value;

value = (u32_t)(*ptr++) << 24;

value |= (u32_t)(*ptr++) << 16;

value |= (u32_t)(*ptr++) << 8;

value |= (u32_t)(*ptr++);

LWIP_DEBUGF(DHCP_DEBUG, ("option long value=%"U32_F"\n", value));

return value;

}

#endif