[src/trunk]: src/usr.bin/netstat Fix snprintf usage; from Henning Petersen in...

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

details:   https://anonhg.NetBSD.org/src/rev/be8c76559745
branches:  trunk
changeset: 797782:be8c76559745
user:      dholland <dholland%NetBSD.org@localhost>
date:      Sun Jul 27 04:26:23 2014 +0000

description:
Fix snprintf usage; from Henning Petersen in PR 47976.

diffstat:

 usr.bin/netstat/show.c |  6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)

diffs (27 lines):

diff -r 7331dc91fc88 -r be8c76559745 usr.bin/netstat/show.c
--- a/usr.bin/netstat/show.c    Sun Jul 27 04:23:44 2014 +0000
+++ b/usr.bin/netstat/show.c    Sun Jul 27 04:26:23 2014 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: show.c,v 1.19 2014/04/28 15:41:15 christos Exp $       */
+/*     $NetBSD: show.c,v 1.20 2014/07/27 04:26:23 dholland Exp $       */
 /*     $OpenBSD: show.c,v 1.1 2006/05/27 19:16:37 claudio Exp $        */
 
 /*
@@ -705,6 +705,7 @@
 mpls_ntoa(const struct sockaddr *sa)
 {
        static char obuf[16];
+       size_t olen;
        const union mpls_shim *pms;
        union mpls_shim ms;
        int psize = sizeof(struct sockaddr_mpls);
@@ -717,7 +718,8 @@
        while(psize < sa->sa_len) {
                pms++;
                ms.s_addr = ntohl(pms->s_addr);
-               snprintf(obuf, sizeof(obuf), "%s,%u", obuf,
+               olen = strlen(obuf);
+               snprintf(obuf + olen, sizeof(obuf) - olen, ",%u",
                    ms.shim.label);
                psize+=sizeof(ms);
        }