/* 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 longinet_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;}
/* 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;
}