source: asp3_tinet_ecnl_rx/trunk/musl-1.1.18/src/network/inet_legacy.c@ 337

#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>

in_addr_t inet_network(const char *p)
{
        return ntohl(inet_addr(p));
}

struct in_addr inet_makeaddr(in_addr_t n, in_addr_t h)
{
        if (n < 256) h |= n<<24;
        else if (n < 65536) h |= n<<16;
        else h |= n<<8;
        return (struct in_addr){ h };
}

in_addr_t inet_lnaof(struct in_addr in)
{
        uint32_t h = in.s_addr;
        if (h>>24 < 128) return h & 0xffffff;
        if (h>>24 < 192) return h & 0xffff;
        return h & 0xff;
}

in_addr_t inet_netof(struct in_addr in)
{
        uint32_t h = in.s_addr;
        if (h>>24 < 128) return h >> 24;
        if (h>>24 < 192) return h >> 16;
        return h >> 8;
}