Merge remote-tracking branch 'remotes/dgit/dgit/sid'

[chiark-utils.git] / scripts / random-word

diff --git a/scripts/random-word b/scripts/random-word
index a7a27999fd9589cdeb025eb5e4c16bacd42e5ebe..649af152a3c074a55be6e3b3ef33e081ec03881f 100755 (executable)
--- a/scripts/random-word
+++ b/scripts/random-word
@@ -1,26 +1,47 @@
-#!/usr/bin/perl
+#!/usr/bin/perl -w
+
+# Copyright 2004 Ian Jackson <ian@chiark.greenend.org.uk>
+#
+# This script and its documentation (if any) are free software; you
+# can redistribute it and/or modify them under the terms of the GNU
+# General Public License as published by the Free Software Foundation;
+# either version 3, or (at your option) any later version.
+# 
+# chiark-named-conf and its manpage are distributed in the hope that
+# it will be useful, but WITHOUT ANY WARRANTY; without even the
+# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
+# PURPOSE.  See the GNU General Public License for more details.
+# 
+# You should have received a copy of the GNU General Public License along
+# with this program; if not, consult the Free Software Foundation's
+# website at www.fsf.org, or the GNU Project website at www.gnu.org.
+
+use strict;
 
 use IO::Handle;
 use IO::File;
 use POSIX;
 
-$want= 1;
-$filename= "/usr/share/dict/words";
-@randfile= ("/dev/urandom", "/dev/random");
+our $want= 1;
+our $filename= "/usr/share/dict/words";
+our @randfile= ("/dev/urandom", "/dev/random");
+our $filemaxlen;
 
 sub fail ($) { die "random-word: $_[0]\n"; }
 open D, ">/dev/null" or fail("open /dev/null: $!");
 
-while ($ARGV[0] =~ m/^\-/) {
+while (@ARGV && $ARGV[0] =~ m/^\-/) {
     $_= shift @ARGV;
     if (m/^\-\-?$/) {
        last;
     } elsif (m/^\-n(\d+)$/) {
        $want= $1;
     } elsif (m/^\-f/ && length > 2) {
-       $filename= $';
+       $filename= $'; #';
+    } elsif (m/^\-F(\d+)$/) {
+       $filemaxlen= $1;
     } elsif (m/^\-r/ && length > 2) {
-       @randfile= ($');
+       @randfile= ($'); #');
     } elsif (m/^\-D$/) {
        open D, ">&STDERR" or fail("dup stderr for debug: $!");
     } else {
@@ -33,6 +54,9 @@ sub debug ($) {
        or fail("write debug: $!");
 }
 
+our $randfile;
+our $r;
+
 for $randfile (@randfile) {
     $r= new IO::File "$randfile", 'r';
     debug("open $randfile ".($r ? "ok" : "failed $!"));
@@ -42,17 +66,28 @@ for $randfile (@randfile) {
 $r or fail("could not open any random device: $!\n (tried @randfile)");
 $r->autoflush(0);
 
-$w= new IO::File $filename, 'r';
+our $w= new IO::File $filename, 'r';
 $w or fail("cannot open $filename: $!");
 debug("open $filename ok");
-@words= <$w>;
+our @words;
+if (defined $filemaxlen) {
+    while (@words < $filemaxlen) {
+       my $l = <$w>;
+       last unless defined $l;
+       push @words, $l;
+    }
+} else {
+    @words= <$w>;
+}
 $w->error and fail("cannot read $filename: $!");
 debug("read $filename ok");
 
+our @out;
 while (@out < $want) {
+    my $rbytes;
     $!=0; read $r,$rbytes,4;
     length $rbytes==4 or fail("cannot read $randfile: $!");
-    $wordno= unpack 'L',$rbytes;
+    my $wordno= unpack 'L',$rbytes;
     $wordno &= ~0x80000000;
     $wordno %= @words;
     $_= $words[$wordno];