1 #include <sys/socket.h>
2 #include <netinet/in.h>
9 const char *inet_ntop(int af, const void *restrict a0, char *restrict s, socklen_t l)
11 const unsigned char *a = a0;
17 if (snprintf(s, l, "%d.%d.%d.%d", a[0],a[1],a[2],a[3]) < l)
21 if (memcmp(a, "\0\0\0\0\0\0\0\0\0\0\377\377", 12))
22 snprintf(buf, sizeof buf,
23 "%x:%x:%x:%x:%x:%x:%x:%x",
24 256*a[0]+a[1],256*a[2]+a[3],
25 256*a[4]+a[5],256*a[6]+a[7],
26 256*a[8]+a[9],256*a[10]+a[11],
27 256*a[12]+a[13],256*a[14]+a[15]);
29 snprintf(buf, sizeof buf,
30 "%x:%x:%x:%x:%x:%x:%d.%d.%d.%d",
31 256*a[0]+a[1],256*a[2]+a[3],
32 256*a[4]+a[5],256*a[6]+a[7],
33 256*a[8]+a[9],256*a[10]+a[11],
34 a[12],a[13],a[14],a[15]);
35 /* Replace longest /(^0|:)[:0]{2,}/ with "::" */
36 for (i=best=0, max=2; buf[i]; i++) {
37 if (i && buf[i] != ':') continue;
38 j = strspn(buf+i, ":0");
39 if (j>max) best=i, max=j;
42 buf[best] = buf[best+1] = ':';
43 memmove(buf+best+2, buf+best+max, i-best-max+1);
45 if (strlen(buf) < l) {