Subversion Repositories planix.SVN

/* posix */
#include <sys/types.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>

/* bsd extensions */
#include <sys/uio.h>
#include <sys/socket.h>
#include <netinet/in.h>

#define CLASS(x)        (x[0]>>6)

unsigned long
inet_addr(char *from)
{
        int i;
        char *p;
        unsigned char to[4];
        unsigned long x;
 
        p = from;
        memset(to, 0, 4);
        for(i = 0; i < 4 && *p; i++){
                to[i] = strtoul(p, &p, 0);
                if(*p == '.')
                        p++;
        }

        switch(CLASS(to)){
        case 0:  /* class A - 1 byte net */
        case 1:
                if(i == 3){
                        to[3] = to[2];
                        to[2] = to[1];
                        to[1] = 0;
                } else if (i == 2){
                        to[3] = to[1];
                        to[1] = 0;
                }
                break;
        case 2: /* class B - 2 byte net */
                if(i == 3){
                        to[3] = to[2];
                        to[2] = 0;
                }
                break;
        }
        x = nptohl(to);
        x = htonl(x);
        return x;
}