3 # Copyright 2004 Ian Jackson <ian@chiark.greenend.org.uk>
5 # This script and its documentation (if any) are free software; you
6 # can redistribute it and/or modify them under the terms of the GNU
7 # General Public License as published by the Free Software Foundation;
8 # either version 3, or (at your option) any later version.
10 # chiark-named-conf and its manpage are distributed in the hope that
11 # it will be useful, but WITHOUT ANY WARRANTY; without even the
12 # implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
13 # PURPOSE. See the GNU General Public License for more details.
15 # You should have received a copy of the GNU General Public License along
16 # with this program; if not, consult the Free Software Foundation's
17 # website at www.fsf.org, or the GNU Project website at www.gnu.org.
26 our $filename= "/usr/share/dict/words";
27 our @randfile= ("/dev/urandom", "/dev/random");
29 sub fail ($) { die "random-word: $_[0]\n"; }
30 open D, ">/dev/null" or fail("open /dev/null: $!");
32 while (@ARGV && $ARGV[0] =~ m/^\-/) {
36 } elsif (m/^\-n(\d+)$/) {
38 } elsif (m/^\-f/ && length > 2) {
40 } elsif (m/^\-r/ && length > 2) {
43 open D, ">&STDERR" or fail("dup stderr for debug: $!");
45 fail("unknown option \`$_'");
50 print D "random-word: debug: $_[0]\n"
51 or fail("write debug: $!");
57 for $randfile (@randfile) {
58 $r= new IO::File "$randfile", 'r';
59 debug("open $randfile ".($r ? "ok" : "failed $!"));
61 $!==&ENOENT or fail("cannot open $randfile: $!");
63 $r or fail("could not open any random device: $!\n (tried @randfile)");
66 our $w= new IO::File $filename, 'r';
67 $w or fail("cannot open $filename: $!");
68 debug("open $filename ok");
70 $w->error and fail("cannot read $filename: $!");
71 debug("read $filename ok");
74 while (@out < $want) {
76 $!=0; read $r,$rbytes,4;
77 length $rbytes==4 or fail("cannot read $randfile: $!");
78 my $wordno= unpack 'L',$rbytes;
79 $wordno &= ~0x80000000;
83 debug("picked $wordno \`$_'");
84 next unless m/^([a-z][-a-z]+)$/;
86 debug("good, now ".scalar @out);
91 print join(' ',@out), "\n"
92 or fail("cannot write output: $!");