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linux-hardened/scripts/get_maintainer.pl
Joe Perches b781655a6f scripts/get_maintainer.pl: add maintainers in order listed in matched section 
Previous behavior was "bottom-up" in each section from the pattern "F:"
entry that matched.  Now information is entered into the various lists in
the "as entered" order for each matched section.

This also allows the F: entry to be put anywhere in a section, not just as
the last entries in the section.

And a couple of improvements:

Don't alphabetically sort before outputting the matched scm, status,
subsystem and web sections.

Ignore content after a single email address so these entries are acceptable
M:	name <address> whatever other comment

And a fix:

Make an M: entry without a name again use the name from an immediately
preceding P: line if it exists.

Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-09-22 07:17:46 -07:00

924 lines
22 KiB
Perl
Executable file
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#!/usr/bin/perl -w
# (c) 2007, Joe Perches <joe@perches.com>
# created from checkpatch.pl
#
# Print selected MAINTAINERS information for
# the files modified in a patch or for a file
#
# usage: perl scripts/get_maintainers.pl [OPTIONS] <patch>
# perl scripts/get_maintainers.pl [OPTIONS] -f <file>
#
# Licensed under the terms of the GNU GPL License version 2
use strict;
my $P = $0;
my $V = '0.20';
use Getopt::Long qw(:config no_auto_abbrev);
my $lk_path = "./";
my $email = 1;
my $email_usename = 1;
my $email_maintainer = 1;
my $email_list = 1;
my $email_subscriber_list = 0;
my $email_git = 1;
my $email_git_penguin_chiefs = 0;
my $email_git_min_signatures = 1;
my $email_git_max_maintainers = 5;
my $email_git_min_percent = 5;
my $email_git_since = "1-year-ago";
my $email_git_blame = 0;
my $email_remove_duplicates = 1;
my $output_multiline = 1;
my $output_separator = ", ";
my $scm = 0;
my $web = 0;
my $subsystem = 0;
my $status = 0;
my $from_filename = 0;
my $pattern_depth = 0;
my $version = 0;
my $help = 0;
my $exit = 0;
my @penguin_chief = ();
push(@penguin_chief,"Linus Torvalds:torvalds\@linux-foundation.org");
#Andrew wants in on most everything - 2009/01/14
#push(@penguin_chief,"Andrew Morton:akpm\@linux-foundation.org");
my @penguin_chief_names = ();
foreach my $chief (@penguin_chief) {
if ($chief =~ m/^(.*):(.*)/) {
my $chief_name = $1;
my $chief_addr = $2;
push(@penguin_chief_names, $chief_name);
}
}
my $penguin_chiefs = "\(" . join("|",@penguin_chief_names) . "\)";
# rfc822 email address - preloaded methods go here.
my $rfc822_lwsp = "(?:(?:\\r\\n)?[ \\t])";
my $rfc822_char = '[\\000-\\377]';
if (!GetOptions(
'email!' => \$email,
'git!' => \$email_git,
'git-chief-penguins!' => \$email_git_penguin_chiefs,
'git-min-signatures=i' => \$email_git_min_signatures,
'git-max-maintainers=i' => \$email_git_max_maintainers,
'git-min-percent=i' => \$email_git_min_percent,
'git-since=s' => \$email_git_since,
'git-blame!' => \$email_git_blame,
'remove-duplicates!' => \$email_remove_duplicates,
'm!' => \$email_maintainer,
'n!' => \$email_usename,
'l!' => \$email_list,
's!' => \$email_subscriber_list,
'multiline!' => \$output_multiline,
'separator=s' => \$output_separator,
'subsystem!' => \$subsystem,
'status!' => \$status,
'scm!' => \$scm,
'web!' => \$web,
'pattern-depth=i' => \$pattern_depth,
'f|file' => \$from_filename,
'v|version' => \$version,
'h|help' => \$help,
)) {
usage();
die "$P: invalid argument\n";
}
if ($help != 0) {
usage();
exit 0;
}
if ($version != 0) {
print("${P} ${V}\n");
exit 0;
}
if ($#ARGV < 0) {
usage();
die "$P: argument missing: patchfile or -f file please\n";
}
if ($output_separator ne ", ") {
$output_multiline = 0;
}
my $selections = $email + $scm + $status + $subsystem + $web;
if ($selections == 0) {
usage();
die "$P: Missing required option: email, scm, status, subsystem or web\n";
}
if ($email &&
($email_maintainer + $email_list + $email_subscriber_list +
$email_git + $email_git_penguin_chiefs + $email_git_blame) == 0) {
usage();
die "$P: Please select at least 1 email option\n";
}
if (!top_of_kernel_tree($lk_path)) {
die "$P: The current directory does not appear to be "
. "a linux kernel source tree.\n";
}
## Read MAINTAINERS for type/value pairs
my @typevalue = ();
open(MAINT, "<${lk_path}MAINTAINERS") || die "$P: Can't open MAINTAINERS\n";
while (<MAINT>) {
my $line = $_;
if ($line =~ m/^(\C):\s*(.*)/) {
my $type = $1;
my $value = $2;
##Filename pattern matching
if ($type eq "F" || $type eq "X") {
$value =~ s@\.@\\\.@g; ##Convert . to \.
$value =~ s/\*/\.\*/g; ##Convert * to .*
$value =~ s/\?/\./g; ##Convert ? to .
##if pattern is a directory and it lacks a trailing slash, add one
if ((-d $value)) {
$value =~ s@([^/])$@$1/@;
}
}
push(@typevalue, "$type:$value");
} elsif (!/^(\s)*$/) {
$line =~ s/\n$//g;
push(@typevalue, $line);
}
}
close(MAINT);
my %mailmap;
if ($email_remove_duplicates) {
open(MAILMAP, "<${lk_path}.mailmap") || warn "$P: Can't open .mailmap\n";
while (<MAILMAP>) {
my $line = $_;
next if ($line =~ m/^\s*#/);
next if ($line =~ m/^\s*$/);
my ($name, $address) = parse_email($line);
$line = format_email($name, $address);
next if ($line =~ m/^\s*$/);
if (exists($mailmap{$name})) {
my $obj = $mailmap{$name};
push(@$obj, $address);
} else {
my @arr = ($address);
$mailmap{$name} = \@arr;
}
}
close(MAILMAP);
}
## use the filenames on the command line or find the filenames in the patchfiles
my @files = ();
my @range = ();
foreach my $file (@ARGV) {
##if $file is a directory and it lacks a trailing slash, add one
if ((-d $file)) {
$file =~ s@([^/])$@$1/@;
} elsif (!(-f $file)) {
die "$P: file '${file}' not found\n";
}
if ($from_filename) {
push(@files, $file);
} else {
my $file_cnt = @files;
my $lastfile;
open(PATCH, "<$file") or die "$P: Can't open ${file}\n";
while (<PATCH>) {
if (m/^\+\+\+\s+(\S+)/) {
my $filename = $1;
$filename =~ s@^[^/]*/@@;
$filename =~ s@\n@@;
$lastfile = $filename;
push(@files, $filename);
} elsif (m/^\@\@ -(\d+),(\d+)/) {
if ($email_git_blame) {
push(@range, "$lastfile:$1:$2");
}
}
}
close(PATCH);
if ($file_cnt == @files) {
warn "$P: file '${file}' doesn't appear to be a patch. "
. "Add -f to options?\n";
}
@files = sort_and_uniq(@files);
}
}
my @email_to = ();
my @list_to = ();
my @scm = ();
my @web = ();
my @subsystem = ();
my @status = ();
# Find responsible parties
foreach my $file (@files) {
#Do not match excluded file patterns
my $exclude = 0;
foreach my $line (@typevalue) {
if ($line =~ m/^(\C):\s*(.*)/) {
my $type = $1;
my $value = $2;
if ($type eq 'X') {
if (file_match_pattern($file, $value)) {
$exclude = 1;
last;
}
}
}
}
if (!$exclude) {
my $tvi = 0;
my %hash;
foreach my $line (@typevalue) {
if ($line =~ m/^(\C):\s*(.*)/) {
my $type = $1;
my $value = $2;
if ($type eq 'F') {
if (file_match_pattern($file, $value)) {
my $value_pd = ($value =~ tr@/@@);
my $file_pd = ($file =~ tr@/@@);
$value_pd++ if (substr($value,-1,1) ne "/");
if ($pattern_depth == 0 ||
(($file_pd - $value_pd) < $pattern_depth)) {
$hash{$tvi} = $value_pd;
}
}
}
}
$tvi++;
}
foreach my $line (sort {$hash{$b} <=> $hash{$a}} keys %hash) {
add_categories($line);
}
}
if ($email && $email_git) {
recent_git_signoffs($file);
}
if ($email && $email_git_blame) {
git_assign_blame($file);
}
}
if ($email) {
foreach my $chief (@penguin_chief) {
if ($chief =~ m/^(.*):(.*)/) {
my $email_address;
$email_address = format_email($1, $2);
if ($email_git_penguin_chiefs) {
push(@email_to, $email_address);
} else {
@email_to = grep(!/${email_address}/, @email_to);
}
}
}
}
if ($email || $email_list) {
my @to = ();
if ($email) {
@to = (@to, @email_to);
}
if ($email_list) {
@to = (@to, @list_to);
}
output(uniq(@to));
}
if ($scm) {
@scm = uniq(@scm);
output(@scm);
}
if ($status) {
@status = uniq(@status);
output(@status);
}
if ($subsystem) {
@subsystem = uniq(@subsystem);
output(@subsystem);
}
if ($web) {
@web = uniq(@web);
output(@web);
}
exit($exit);
sub file_match_pattern {
my ($file, $pattern) = @_;
if (substr($pattern, -1) eq "/") {
if ($file =~ m@^$pattern@) {
return 1;
}
} else {
if ($file =~ m@^$pattern@) {
my $s1 = ($file =~ tr@/@@);
my $s2 = ($pattern =~ tr@/@@);
if ($s1 == $s2) {
return 1;
}
}
}
return 0;
}
sub usage {
print <<EOT;
usage: $P [options] patchfile
$P [options] -f file|directory
version: $V
MAINTAINER field selection options:
--email => print email address(es) if any
--git => include recent git \*-by: signers
--git-chief-penguins => include ${penguin_chiefs}
--git-min-signatures => number of signatures required (default: 1)
--git-max-maintainers => maximum maintainers to add (default: 5)
--git-min-percent => minimum percentage of commits required (default: 5)
--git-since => git history to use (default: 1-year-ago)
--git-blame => use git blame to find modified commits for patch or file
--m => include maintainer(s) if any
--n => include name 'Full Name <addr\@domain.tld>'
--l => include list(s) if any
--s => include subscriber only list(s) if any
--remove-duplicates => minimize duplicate email names/addresses
--scm => print SCM tree(s) if any
--status => print status if any
--subsystem => print subsystem name if any
--web => print website(s) if any
Output type options:
--separator [, ] => separator for multiple entries on 1 line
using --separator also sets --nomultiline if --separator is not [, ]
--multiline => print 1 entry per line
Other options:
--pattern-depth => Number of pattern directory traversals (default: 0 (all))
--version => show version
--help => show this help information
Default options:
[--email --git --m --n --l --multiline --pattern-depth=0 --remove-duplicates]
Notes:
Using "-f directory" may give unexpected results:
Used with "--git", git signators for _all_ files in and below
directory are examined as git recurses directories.
Any specified X: (exclude) pattern matches are _not_ ignored.
Used with "--nogit", directory is used as a pattern match,
no individual file within the directory or subdirectory
is matched.
Used with "--git-blame", does not iterate all files in directory
Using "--git-blame" is slow and may add old committers and authors
that are no longer active maintainers to the output.
EOT
}
sub top_of_kernel_tree {
my ($lk_path) = @_;
if ($lk_path ne "" && substr($lk_path,length($lk_path)-1,1) ne "/") {
$lk_path .= "/";
}
if ( (-f "${lk_path}COPYING")
&& (-f "${lk_path}CREDITS")
&& (-f "${lk_path}Kbuild")
&& (-f "${lk_path}MAINTAINERS")
&& (-f "${lk_path}Makefile")
&& (-f "${lk_path}README")
&& (-d "${lk_path}Documentation")
&& (-d "${lk_path}arch")
&& (-d "${lk_path}include")
&& (-d "${lk_path}drivers")
&& (-d "${lk_path}fs")
&& (-d "${lk_path}init")
&& (-d "${lk_path}ipc")
&& (-d "${lk_path}kernel")
&& (-d "${lk_path}lib")
&& (-d "${lk_path}scripts")) {
return 1;
}
return 0;
}
sub parse_email {
my ($formatted_email) = @_;
my $name = "";
my $address = "";
if ($formatted_email =~ /^([^<]+)<(.+\@.*)>.*$/) {
$name = $1;
$address = $2;
} elsif ($formatted_email =~ /^\s*<(.+\@\S*)>.*$/) {
$address = $1;
} elsif ($formatted_email =~ /^(.+\@\S*).*$/) {
$address = $1;
}
$name =~ s/^\s+|\s+$//g;
$name =~ s/^\"|\"$//g;
$address =~ s/^\s+|\s+$//g;
if ($name =~ /[^a-z0-9 \.\-]/i) { ##has "must quote" chars
$name =~ s/(?<!\\)"/\\"/g; ##escape quotes
$name = "\"$name\"";
}
return ($name, $address);
}
sub format_email {
my ($name, $address) = @_;
my $formatted_email;
$name =~ s/^\s+|\s+$//g;
$name =~ s/^\"|\"$//g;
$address =~ s/^\s+|\s+$//g;
if ($name =~ /[^a-z0-9 \.\-]/i) { ##has "must quote" chars
$name =~ s/(?<!\\)"/\\"/g; ##escape quotes
$name = "\"$name\"";
}
if ($email_usename) {
if ("$name" eq "") {
$formatted_email = "$address";
} else {
$formatted_email = "$name <${address}>";
}
} else {
$formatted_email = $address;
}
return $formatted_email;
}
sub find_starting_index {
my ($index) = @_;
while ($index > 0) {
my $tv = $typevalue[$index];
if (!($tv =~ m/^(\C):\s*(.*)/)) {
last;
}
$index--;
}
return $index;
}
sub find_ending_index {
my ($index) = @_;
while ($index < @typevalue) {
my $tv = $typevalue[$index];
if (!($tv =~ m/^(\C):\s*(.*)/)) {
last;
}
$index++;
}
return $index;
}
sub add_categories {
my ($index) = @_;
my $i;
my $start = find_starting_index($index);
my $end = find_ending_index($index);
push(@subsystem, $typevalue[$start]);
for ($i = $start + 1; $i < $end; $i++) {
my $tv = $typevalue[$i];
if ($tv =~ m/^(\C):\s*(.*)/) {
my $ptype = $1;
my $pvalue = $2;
if ($ptype eq "L") {
my $list_address = $pvalue;
my $list_additional = "";
if ($list_address =~ m/([^\s]+)\s+(.*)$/) {
$list_address = $1;
$list_additional = $2;
}
if ($list_additional =~ m/subscribers-only/) {
if ($email_subscriber_list) {
push(@list_to, $list_address);
}
} else {
if ($email_list) {
push(@list_to, $list_address);
}
}
} elsif ($ptype eq "M") {
my ($name, $address) = parse_email($pvalue);
if ($name eq "") {
if ($i > 0) {
my $tv = $typevalue[$i - 1];
if ($tv =~ m/^(\C):\s*(.*)/) {
if ($1 eq "P") {
$name = $2;
$pvalue = format_email($name, $address);
}
}
}
}
if ($email_maintainer) {
push_email_addresses($pvalue);
}
} elsif ($ptype eq "T") {
push(@scm, $pvalue);
} elsif ($ptype eq "W") {
push(@web, $pvalue);
} elsif ($ptype eq "S") {
push(@status, $pvalue);
}
}
}
}
my %email_hash_name;
my %email_hash_address;
sub email_inuse {
my ($name, $address) = @_;
return 1 if (($name eq "") && ($address eq ""));
return 1 if (($name ne "") && exists($email_hash_name{$name}));
return 1 if (($address ne "") && exists($email_hash_address{$address}));
return 0;
}
sub push_email_address {
my ($line) = @_;
my ($name, $address) = parse_email($line);
if ($address eq "") {
return 0;
}
if (!$email_remove_duplicates) {
push(@email_to, format_email($name, $address));
} elsif (!email_inuse($name, $address)) {
push(@email_to, format_email($name, $address));
$email_hash_name{$name}++;
$email_hash_address{$address}++;
}
return 1;
}
sub push_email_addresses {
my ($address) = @_;
my @address_list = ();
if (rfc822_valid($address)) {
push_email_address($address);
} elsif (@address_list = rfc822_validlist($address)) {
my $array_count = shift(@address_list);
while (my $entry = shift(@address_list)) {
push_email_address($entry);
}
} else {
if (!push_email_address($address)) {
warn("Invalid MAINTAINERS address: '" . $address . "'\n");
}
}
}
sub which {
my ($bin) = @_;
foreach my $path (split(/:/, $ENV{PATH})) {
if (-e "$path/$bin") {
return "$path/$bin";
}
}
return "";
}
sub mailmap {
my @lines = @_;
my %hash;
foreach my $line (@lines) {
my ($name, $address) = parse_email($line);
if (!exists($hash{$name})) {
$hash{$name} = $address;
} elsif ($address ne $hash{$name}) {
$address = $hash{$name};
$line = format_email($name, $address);
}
if (exists($mailmap{$name})) {
my $obj = $mailmap{$name};
foreach my $map_address (@$obj) {
if (($map_address eq $address) &&
($map_address ne $hash{$name})) {
$line = format_email($name, $hash{$name});
}
}
}
}
return @lines;
}
sub recent_git_signoffs {
my ($file) = @_;
my $sign_offs = "";
my $cmd = "";
my $output = "";
my $count = 0;
my @lines = ();
my %hash;
my $total_sign_offs;
if (which("git") eq "") {
warn("$P: git not found. Add --nogit to options?\n");
return;
}
if (!(-d ".git")) {
warn("$P: .git directory not found. Use a git repository for better results.\n");
warn("$P: perhaps 'git clone git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git'\n");
return;
}
$cmd = "git log --since=${email_git_since} -- ${file}";
$output = `${cmd}`;
$output =~ s/^\s*//gm;
@lines = split("\n", $output);
@lines = grep(/^[-_ a-z]+by:.*\@.*$/i, @lines);
if (!$email_git_penguin_chiefs) {
@lines = grep(!/${penguin_chiefs}/i, @lines);
}
# cut -f2- -d":"
s/.*:\s*(.+)\s*/$1/ for (@lines);
$total_sign_offs = @lines;
if ($email_remove_duplicates) {
@lines = mailmap(@lines);
}
@lines = sort(@lines);
# uniq -c
$hash{$_}++ for @lines;
# sort -rn
foreach my $line (sort {$hash{$b} <=> $hash{$a}} keys %hash) {
my $sign_offs = $hash{$line};
$count++;
last if ($sign_offs < $email_git_min_signatures ||
$count > $email_git_max_maintainers ||
$sign_offs * 100 / $total_sign_offs < $email_git_min_percent);
push_email_address($line);
}
}
sub save_commits {
my ($cmd, @commits) = @_;
my $output;
my @lines = ();
$output = `${cmd}`;
@lines = split("\n", $output);
foreach my $line (@lines) {
if ($line =~ m/^(\w+) /) {
push (@commits, $1);
}
}
return @commits;
}
sub git_assign_blame {
my ($file) = @_;
my @lines = ();
my @commits = ();
my $cmd;
my $output;
my %hash;
my $total_sign_offs;
my $count;
if (@range) {
foreach my $file_range_diff (@range) {
next if (!($file_range_diff =~ m/(.+):(.+):(.+)/));
my $diff_file = $1;
my $diff_start = $2;
my $diff_length = $3;
next if (!("$file" eq "$diff_file"));
$cmd = "git blame -l -L $diff_start,+$diff_length $file";
@commits = save_commits($cmd, @commits);
}
} else {
if (-f $file) {
$cmd = "git blame -l $file";
@commits = save_commits($cmd, @commits);
}
}
$total_sign_offs = 0;
@commits = uniq(@commits);
foreach my $commit (@commits) {
$cmd = "git log -1 ${commit}";
$output = `${cmd}`;
$output =~ s/^\s*//gm;
@lines = split("\n", $output);
@lines = grep(/^[-_ a-z]+by:.*\@.*$/i, @lines);
if (!$email_git_penguin_chiefs) {
@lines = grep(!/${penguin_chiefs}/i, @lines);
}
# cut -f2- -d":"
s/.*:\s*(.+)\s*/$1/ for (@lines);
$total_sign_offs += @lines;
if ($email_remove_duplicates) {
@lines = mailmap(@lines);
}
$hash{$_}++ for @lines;
}
$count = 0;
foreach my $line (sort {$hash{$b} <=> $hash{$a}} keys %hash) {
my $sign_offs = $hash{$line};
$count++;
last if ($sign_offs < $email_git_min_signatures ||
$count > $email_git_max_maintainers ||
$sign_offs * 100 / $total_sign_offs < $email_git_min_percent);
push_email_address($line);
}
}
sub uniq {
my @parms = @_;
my %saw;
@parms = grep(!$saw{$_}++, @parms);
return @parms;
}
sub sort_and_uniq {
my @parms = @_;
my %saw;
@parms = sort @parms;
@parms = grep(!$saw{$_}++, @parms);
return @parms;
}
sub output {
my @parms = @_;
if ($output_multiline) {
foreach my $line (@parms) {
print("${line}\n");
}
} else {
print(join($output_separator, @parms));
print("\n");
}
}
my $rfc822re;
sub make_rfc822re {
# Basic lexical tokens are specials, domain_literal, quoted_string, atom, and
# comment. We must allow for rfc822_lwsp (or comments) after each of these.
# This regexp will only work on addresses which have had comments stripped
# and replaced with rfc822_lwsp.
my $specials = '()<>@,;:\\\\".\\[\\]';
my $controls = '\\000-\\037\\177';
my $dtext = "[^\\[\\]\\r\\\\]";
my $domain_literal = "\\[(?:$dtext|\\\\.)*\\]$rfc822_lwsp*";
my $quoted_string = "\"(?:[^\\\"\\r\\\\]|\\\\.|$rfc822_lwsp)*\"$rfc822_lwsp*";
# Use zero-width assertion to spot the limit of an atom. A simple
# $rfc822_lwsp* causes the regexp engine to hang occasionally.
my $atom = "[^$specials $controls]+(?:$rfc822_lwsp+|\\Z|(?=[\\[\"$specials]))";
my $word = "(?:$atom|$quoted_string)";
my $localpart = "$word(?:\\.$rfc822_lwsp*$word)*";
my $sub_domain = "(?:$atom|$domain_literal)";
my $domain = "$sub_domain(?:\\.$rfc822_lwsp*$sub_domain)*";
my $addr_spec = "$localpart\@$rfc822_lwsp*$domain";
my $phrase = "$word*";
my $route = "(?:\@$domain(?:,\@$rfc822_lwsp*$domain)*:$rfc822_lwsp*)";
my $route_addr = "\\<$rfc822_lwsp*$route?$addr_spec\\>$rfc822_lwsp*";
my $mailbox = "(?:$addr_spec|$phrase$route_addr)";
my $group = "$phrase:$rfc822_lwsp*(?:$mailbox(?:,\\s*$mailbox)*)?;\\s*";
my $address = "(?:$mailbox|$group)";
return "$rfc822_lwsp*$address";
}
sub rfc822_strip_comments {
my $s = shift;
# Recursively remove comments, and replace with a single space. The simpler
# regexps in the Email Addressing FAQ are imperfect - they will miss escaped
# chars in atoms, for example.
while ($s =~ s/^((?:[^"\\]|\\.)*
(?:"(?:[^"\\]|\\.)*"(?:[^"\\]|\\.)*)*)
\((?:[^()\\]|\\.)*\)/$1 /osx) {}
return $s;
}
# valid: returns true if the parameter is an RFC822 valid address
#
sub rfc822_valid ($) {
my $s = rfc822_strip_comments(shift);
if (!$rfc822re) {
$rfc822re = make_rfc822re();
}
return $s =~ m/^$rfc822re$/so && $s =~ m/^$rfc822_char*$/;
}
# validlist: In scalar context, returns true if the parameter is an RFC822
# valid list of addresses.
#
# In list context, returns an empty list on failure (an invalid
# address was found); otherwise a list whose first element is the
# number of addresses found and whose remaining elements are the
# addresses. This is needed to disambiguate failure (invalid)
# from success with no addresses found, because an empty string is
# a valid list.
sub rfc822_validlist ($) {
my $s = rfc822_strip_comments(shift);
if (!$rfc822re) {
$rfc822re = make_rfc822re();
}
# * null list items are valid according to the RFC
# * the '1' business is to aid in distinguishing failure from no results
my @r;
if ($s =~ m/^(?:$rfc822re)?(?:,(?:$rfc822re)?)*$/so &&
$s =~ m/^$rfc822_char*$/) {
while ($s =~ m/(?:^|,$rfc822_lwsp*)($rfc822re)/gos) {
push @r, $1;
}
return wantarray ? (scalar(@r), @r) : 1;
}
else {
return wantarray ? () : 0;
}
}
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