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#!/usr/bin/perl -w
use strict;
our (@Changed, $TAP);
use File::Compare;
use Symbol;
use Text::Wrap();
# Common functions needed by the regen scripts
our $Needs_Write = $^O eq 'cygwin' || $^O eq 'os2' || $^O eq 'MSWin32';
our $Verbose = 0;
@ARGV = grep { not($_ eq '-q' and $Verbose = -1) }
grep { not($_ eq '--tap' and $TAP = 1) }
grep { not($_ eq '-v' and $Verbose = 1) } @ARGV;
END {
print STDOUT "Changed: @Changed\n" if @Changed;
}
sub safer_unlink {
my @names = @_;
my $cnt = 0;
my $name;
foreach $name (@names) {
next unless -e $name;
chmod 0777, $name if $Needs_Write;
( CORE::unlink($name) and ++$cnt
or warn "Couldn't unlink $name: $!\n" );
}
return $cnt;
}
# Open a new file.
sub open_new {
my ($final_name, $mode, $header, $force) = @_;
my $name = $final_name . '-new';
my $lang = $final_name =~ /\.pod$/ ? 'Pod' :
$final_name =~ /\.(?:c|h|inc|tab|act)$/ ? 'C' : 'Perl';
if ($force && -e $final_name) {
chmod 0777, $name if $Needs_Write;
CORE::unlink $final_name
or die "Couldn't unlink $final_name: $!\n";
}
my $fh = gensym;
if (!defined $mode or $mode eq '>') {
if (-f $name) {
unlink $name or die "$name exists but can't unlink: $!";
}
open $fh, '>', $name or die "Can't create $name: $!";
} elsif ($mode eq '>>') {
open $fh, '>>', $name or die "Can't append to $name: $!";
} else {
die "Unhandled open mode '$mode'";
}
@{*$fh}{qw(name final_name lang force)}
= ($name, $final_name, $lang, $force);
binmode $fh;
print {$fh} read_only_top(lang => $lang, %$header) if $header;
$fh;
}
sub close_and_rename {
my $fh = shift;
my ($name, $final_name, $force) = @{*{$fh}}{qw(name final_name force)};
close $fh or die "Error closing $name: $!";
if ($TAP) {
# Don't use compare because if there are errors it doesn't give any
# way to generate diagnostics about what went wrong.
# These files are small enough to read into memory.
local $/;
# This is the file we just closed, so it should open cleanly:
open $fh, '<', $name
or die "Can't open '$name': $!";
my $want = <$fh>;
die "Can't read '$name': $!"
unless defined $want;
close $fh
or die "Can't close '$name': $!";
my $fail;
if (!open $fh, '<', $final_name) {
$fail = "Can't open '$final_name': $!";
} else {
my $have = <$fh>;
if (!defined $have) {
$fail = "Can't read '$final_name': $!";
close $fh;
} elsif (!close $fh) {
$fail = "Can't close '$final_name': $!";
} elsif ($want ne $have) {
$fail = "'$name' and '$final_name' differ";
}
}
if ($fail) {
print STDOUT "not ok - $0 $final_name\n";
print STDERR "$fail\n";
} else {
print STDOUT "ok - $0 $final_name\n";
}
safer_unlink($name);
return;
}
unless ($force) {
if (compare($name, $final_name) == 0) {
warn "no changes between '$name' & '$final_name'\n" if $Verbose > 0;
safer_unlink($name);
return;
}
warn "changed '$name' to '$final_name'\n" if $Verbose > 0;
push @Changed, $final_name unless $Verbose < 0;
}
# Some DOSish systems can't rename over an existing file:
safer_unlink $final_name;
chmod 0600, $name if $Needs_Write;
rename $name, $final_name or die "renaming $name to $final_name: $!";
}
my %lang_opener = (Perl => '# ', Pod => '', C => '/* ');
sub read_only_top {
my %args = @_;
my $lang = $args{lang};
die "Missing language argument" unless defined $lang;
die "Unknown language argument '$lang'"
unless exists $lang_opener{$lang};
my $style = $args{style} ? " $args{style} " : ' ';
my $raw = "-*- buffer-read-only: t -*-\n";
if ($args{file}) {
$raw .= "\n $args{file}\n";
}
if ($args{copyright}) {
local $" = ', ';
$raw .= wrap(75, ' ', ' ', <<"EOM") . "\n";
Copyright (C) @{$args{copyright}} by\0Larry\0Wall\0and\0others
You may distribute under the terms of either the GNU General Public
License or the Artistic License, as specified in the README file.
EOM
}
$raw .= "!!!!!!! DO NOT EDIT THIS FILE !!!!!!!\n";
if ($args{by}) {
$raw .= "This file is built by $args{by}";
if ($args{from}) {
my @from = ref $args{from} eq 'ARRAY' ? @{$args{from}} : $args{from};
my $last = pop @from;
if (@from) {
$raw .= ' from ' . join (', ', @from) . " and $last";
} else {
$raw .= " from $last";
}
}
$raw .= ".\n";
}
$raw .= "Any changes made here will be lost!\n";
$raw .= $args{final} if $args{final};
my $cooked = $lang eq 'C'
? wrap(78, '/* ', $style, $raw) . " */\n\n"
: wrap(78, $lang_opener{$lang}, $lang_opener{$lang}, $raw) . "\n";
$cooked =~ tr/\0/ /; # Don't break Larry's name etc
$cooked =~ s/ +$//mg; # Remove all trailing spaces
$cooked =~ s! \*/\n!$args{quote}!s if $args{quote};
return $cooked;
}
sub read_only_bottom_close_and_rename {
my ($fh, $sources) = @_;
my ($name, $lang, $final_name) = @{*{$fh}}{qw(name lang final_name)};
die "No final name specified at open time for $name"
unless $final_name;
my $comment;
if ($sources) {
$comment = "Generated from:\n";
foreach my $file (sort @$sources) {
my $digest = (-e $file)
? digest($file)
# Use a random number that won't match the real
# digest, so will always show as out-of-date, so
# Porting tests likely will fail drawing attention
# to the problem.
: int(rand(1_000_000));
$comment .= "$digest $file\n";
}
}
$comment .= "ex: set ro:";
if (defined $lang && $lang eq 'Perl') {
$comment =~ s/^/# /mg;
} elsif (!defined $lang or $lang ne 'Pod') {
$comment =~ s/^/ * /mg;
$comment =~ s! \* !/* !;
$comment .= " */";
}
print $fh "\n$comment\n";
close_and_rename($fh);
}
sub tab {
my ($l, $t) = @_;
$t .= "\t" x ($l - (length($t) + 1) / 8);
$t;
}
sub digest {
my $file = shift;
# Need to defer loading this, as the main regen scripts work back to 5.004,
# and likely we don't even have this module on every 5.8 install yet:
require Digest::SHA;
local ($/, *FH);
open FH, '<', $file or die "Can't open $file: $!";
my $raw = <FH>;
close FH or die "Can't close $file: $!";
return Digest::SHA::sha256_hex($raw);
};
sub wrap {
local $Text::Wrap::columns = shift;
Text::Wrap::wrap(@_);
}
# return the perl version as defined in patchlevel.h.
# (we may be being run by another perl, so $] won't be right)
# return e.g. (5, 14, 3, "5.014003")
sub perl_version {
my $plh = 'patchlevel.h';
open my $fh, "<", $plh or die "can't open '$plh': $!\n";
my ($v1,$v2,$v3);
while (<$fh>) {
$v1 = $1 if /PERL_REVISION\s+(\d+)/;
$v2 = $1 if /PERL_VERSION\s+(\d+)/;
$v3 = $1 if /PERL_SUBVERSION\s+(\d+)/;
}
die "can't locate PERL_REVISION in '$plh'" unless defined $v1;
die "can't locate PERL_VERSION in '$plh'" unless defined $v2;
die "can't locate PERL_SUBVERSION in '$plh'" unless defined $v3;
return ($v1,$v2,$v3, sprintf("%d.%03d%03d", $v1, $v2, $v3));
}
1;
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