Static and Dynamic Configuration in Embedded C Programming

/* This demo program shows the static and dynamic */
/* configuration with respect to IPv4 and IPv6 */
/* Compiler Used - Visual Studio */
#include stdio.h
#include stdint.h

/* IP_ENABLE == 0: none */
/* IP_ENABLE == 1: IPv4 */
/* IP_ENABLE == 2: IPv6 */
/* IP_ENABLE == 3: IPv4 and IPv6 */
#define IP_ENABLE     0

#define TRUE          1
#define FALSE         0

typedef struct
{
  int ipv4_enable;
  int ipv6_enable;
}ipconfig;

ipconfig ip_config;

static void set_ip_config( ipconfig * ptr_config )
{
  ip_config.ipv4_enable = ptr_config->ipv4_enable;
  ip_config.ipv6_enable = ptr_config->ipv6_enable;
}

int main()
{
  ipconfig ip; /*for getting the input*/
  /*Static configuration*/
#if ( IP_ENABLE == 0 )
  ip_config.ipv4_enable = FALSE;
  ip_config.ipv6_enable = FALSE;
#elif ( IP_ENABLE == 1 )
  ip_config.ipv4_enable = TRUE;
  ip_config.ipv6_enable = FALSE;
#elif ( IP_ENABLE == 2 )
  ip_config.ipv4_enable = FALSE;
  ip_config.ipv6_enable = TRUE;
#elif ( IP_ENABLE == 3 )
  ip_config.ipv4_enable = TRUE;
  ip_config.ipv6_enable = TRUE;
#endif

  printf( "IPv4: %d\t", ip_config.ipv4_enable );
  printf( "IPv6: %d\n", ip_config.ipv6_enable );

  /*Dynamic Configuration*/
  (void)scanf( "%d", &(ip.ipv4_enable) );
  (void)scanf( "%d", &(ip.ipv6_enable) );

  set_ip_config( &ip );

  printf( "IPv4: %d\t", ip_config.ipv4_enable );
  printf( "IPv6: %d\n", ip_config.ipv6_enable );

  if ( ip_config.ipv4_enable == TRUE )
  {
    /*Get the IPv4 address from the DHCP server*/
  }

  if ( ip_config.ipv6_enable == TRUE )
  {
    /*Get the IPv6 address from the DHCPv6 server*/
  }
  
  return 0;
}