diplodocus.org Git - nmh/blob - docs/historical/mh-6.8.5/mts/mh/hosts.c

   1 /* hosts.c - find out the official name of a host */
   2 #ifndef lint
   3 static char ident[] = "@(#)$Id: hosts.c,v 1.6 1992/12/15 00:20:22 jromine Exp $";
   4 #endif  /* lint */
   5
   6 /* LINTLIBRARY */
   7
   8 #undef  NETWORK
   9 #if     defined(BSD41A) || defined(BSD42) || defined(SOCKETS)
  10 #define NETWORK
  11 #endif  /* not (defined(BSD41A) || defined(BSD42) || defined(SOCKETS)) */
  12
  13 #include "../h/strings.h"
  14 #include <stdio.h>
  15 #include "../zotnet/mts.h"
  16 #include <ctype.h>
  17 #if     defined(BSD42) || defined(SOCKETS)
  18 #include <netdb.h>
  19 #endif  /* BSD42 or SOCKETS */
  20
  21
  22 #define NOTOK   (-1)
  23
  24 /* \f */
  25
  26 char   *OfficialName (name)
  27 char   *name;
  28 {
  29     register char  *p;
  30     char   *q,
  31             site[BUFSIZ];
  32 #ifdef  NETWORK
  33     static char buffer[BUFSIZ];
  34 #if     defined(BSD42) || defined(SOCKETS)
  35     register struct hostent *hp;
  36 #endif  /* BSD42 or SOCKETS */
  37 #endif  /* NETWORK */
  38
  39     for (p = name, q = site; *p; p++, q++)
  40         *q = isupper (*p) ? tolower (*p) : *p;
  41     *q = 0;
  42     q = site;
  43
  44     if (uleq (LocalName (), site))
  45         return LocalName ();
  46
  47 #ifdef  BSD41A
  48     if (rhost (&q) != NOTOK) {
  49         (void) strcpy (buffer, q);
  50         free (q);
  51         return buffer;
  52     }
  53 #endif  /* BSD41A */
  54 #if     defined(BSD42) || defined(SOCKETS)
  55     if (hp = gethostbyname (q)) {
  56         (void) strcpy (buffer, hp -> h_name);
  57         return buffer;
  58     }
  59 #endif  /* BSD42 or SOCKETS */
  60
  61     return NULL;
  62 }