use strlcpy & strlcat (#74) * refactor checkpubkeyperms() with safe BSD functions fix gcc8 warnings ``` svr-authpubkey.c: In function 'checkpubkeyperms': svr-authpubkey.c:427:2: warning: 'strncat' specified bound 5 equals source length [-Wstringop-overflow=] strncat(filename, "/.ssh", 5); /* strlen("/.ssh") == 5 */ ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ svr-authpubkey.c:433:2: warning: 'strncat' specified bound 16 equals source length [-Wstringop-overflow=] strncat(filename, "/authorized_keys", 16); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ``` see https://www.sudo.ws/todd/papers/strlcpy.html * restore strlcpy in xstrdup see original https://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/xmalloc.c?rev=1.16

#!/usr/bin/perl

# we want to filter every between START_INS and END_INS out and then insert crap from another file (this is fun)

use strict;
use warnings;

open(my $src, '<', shift);
open(my $ins, '<', shift);
open(my $tmp, '>', 'tmp.delme');

my $l = 0;
while (<$src>) {
   if ($_ =~ /START_INS/) {
      print {$tmp} $_;
      $l = 1;
      while (<$ins>) {
         print {$tmp} $_;
      }
      close $ins;
   } elsif ($_ =~ /END_INS/) {
      print {$tmp} $_;
      $l = 0;
   } elsif ($l == 0) {
      print {$tmp} $_;
   }
}

close $tmp;
close $src;

# ref:         $Format:%D$
# git commit:  $Format:%H$
# commit time: $Format:%ai$