src/network/gethostbyaddr.c

   1 #define _GNU_SOURCE
   2
   3 #include <netdb.h>
   4 #include <string.h>
   5 #include <netinet/in.h>
   6 #include <errno.h>
   7 #include <stdlib.h>
   8
   9 struct hostent *gethostbyaddr(const void *a, socklen_t l, int af)
  10 {
  11         static struct hostent *h;
  12         size_t size = 63;
  13         struct hostent *res;
  14         int err;
  15         do {
  16                 free(h);
  17                 h = malloc(size+=size+1);
  18                 if (!h) {
  19                         h_errno = NO_RECOVERY;
  20                         return 0;
  21                 }
  22                 err = gethostbyaddr_r(a, l, af, h,
  23                         (void *)(h+1), size-sizeof *h, &res, &h_errno);
  24         } while (err == ERANGE);
  25         return err ? 0 : h;
  26 }