[src/netbsd-9]: src/usr.bin/w Pull up following revision(s) (requested by kim...

[martin <martin%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/857da4d32e6f
branches:  netbsd-9
changeset: 936708:857da4d32e6f
user:      martin <martin%NetBSD.org@localhost>
date:      Sun Aug 02 09:12:54 2020 +0000

description:
Pull up following revision(s) (requested by kim in ticket #1034):

        usr.bin/w/w.c: revision 1.88
        usr.bin/w/w.c: revision 1.89
        usr.bin/w/w.c: revision 1.90

Handle hostname from DISPLAY="[2001:db8::dead:beef]:0" or similar.

Restore ']' if not using a result from an address lookup.

Skip bracket processing if -n is used.
XXX: This could be improved to skip even more processing.

diffstat:

 usr.bin/w/w.c |  30 ++++++++++++++++++++++++++----
 1 files changed, 26 insertions(+), 4 deletions(-)

diffs (64 lines):

diff -r af3099619321 -r 857da4d32e6f usr.bin/w/w.c
--- a/usr.bin/w/w.c     Sun Aug 02 08:49:08 2020 +0000
+++ b/usr.bin/w/w.c     Sun Aug 02 09:12:54 2020 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: w.c,v 1.84.2.2 2020/07/07 10:43:00 martin Exp $        */
+/*     $NetBSD: w.c,v 1.84.2.3 2020/08/02 09:12:54 martin Exp $        */
 
 /*-
  * Copyright (c) 1980, 1991, 1993, 1994
@@ -39,7 +39,7 @@
 #if 0
 static char sccsid[] = "@(#)w.c        8.6 (Berkeley) 6/30/94";
 #else
-__RCSID("$NetBSD: w.c,v 1.84.2.2 2020/07/07 10:43:00 martin Exp $");
+__RCSID("$NetBSD: w.c,v 1.84.2.3 2020/08/02 09:12:54 martin Exp $");
 #endif
 #endif /* not lint */
 
@@ -621,7 +621,7 @@
 fixhost(struct entry *ep)
 {
        char host_buf[sizeof(ep->host)];
-       char *p, *r, *x, *m;
+       char *b, *m, *p, *r, *x;
        struct hostent *hp;
        union {
                struct in_addr l4;
@@ -650,13 +650,35 @@
                        x = NULL;
        }
 
+       /*
+        * Leading '[' indicates an IP address inside brackets.
+        */
+       b = NULL;
+       if (!nflag && (*p == '[')) {
+               for (b = p++; b < &host_buf[sizeof(host_buf)]; b++)
+                       if (*b == '\0' || *b == ']')
+                               break;
+               if (b < &host_buf[sizeof(host_buf)] && *b == ']') {
+                       *b = '\0';
+                       for (x = b + 1; x < &host_buf[sizeof(host_buf)]; x++)
+                               if (*x == '\0' || *x == ':')
+                                       break;
+                       if (x < &host_buf[sizeof(host_buf)] && *x == ':')
+                               *x++ = '\0';
+               } else
+                       b = NULL;
+       }
+
        int af = m ? AF_INET6 : AF_INET;
        size_t alen = m ? sizeof(l.l6) : sizeof(l.l4);
        if (!nflag && inet_pton(af, p, &l) &&
            (hp = gethostbyaddr((char *)&l, alen, af)))
                r = hp->h_name;
-       else
+       else {
+               if (b)
+                       *b = ']';
                r = host_buf;
+       }
 
        if (domain[0] != '\0') {
                p = r;