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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179#!/usr/bin/env perl# SPDX-License-Identifier: GPL-2.0## Clean a text file -- or directory of text files -- of stealth whitespace.# WARNING: this can be a highly destructive operation. Use with caution.#
use warnings;use bytes;use File::Basename;
# Default options$max_width = 79;
# Clean up space-tab sequences, either by removing spaces or# replacing them with tabs.sub clean_space_tabs($){ no bytes; # Tab alignment depends on characters
my($li) = @_; my($lo) = ''; my $pos = 0; my $nsp = 0; my($i, $c);
for ($i = 0; $i < length($li); $i++) { $c = substr($li, $i, 1); if ($c eq "\t") { my $npos = ($pos+$nsp+8) & ~7; my $ntab = ($npos >> 3) - ($pos >> 3); $lo .= "\t" x $ntab; $pos = $npos; $nsp = 0; } elsif ($c eq "\n" || $c eq "\r") { $lo .= " " x $nsp; $pos += $nsp; $nsp = 0; $lo .= $c; $pos = 0; } elsif ($c eq " ") { $nsp++; } else { $lo .= " " x $nsp; $pos += $nsp; $nsp = 0; $lo .= $c; $pos++; } } $lo .= " " x $nsp; return $lo;}
# Compute the visual width of a stringsub strwidth($) { no bytes; # Tab alignment depends on characters
my($li) = @_; my($c, $i); my $pos = 0; my $mlen = 0;
for ($i = 0; $i < length($li); $i++) { $c = substr($li,$i,1); if ($c eq "\t") { $pos = ($pos+8) & ~7; } elsif ($c eq "\n") { $mlen = $pos if ($pos > $mlen); $pos = 0; } else { $pos++; } }
$mlen = $pos if ($pos > $mlen); return $mlen;}
$name = basename($0);
@files = ();
while (defined($a = shift(@ARGV))) { if ($a =~ /^-/) { if ($a eq '-width' || $a eq '-w') { $max_width = shift(@ARGV)+0; } else { print STDERR "Usage: $name [-width #] files...\n"; exit 1; } } else { push(@files, $a); }}
foreach $f ( @files ) { print STDERR "$name: $f\n";
if (! -f $f) { print STDERR "$f: not a file\n"; next; }
if (!open(FILE, '+<', $f)) { print STDERR "$name: Cannot open file: $f: $!\n"; next; }
binmode FILE;
# First, verify that it is not a binary file; consider any file # with a zero byte to be a binary file. Is there any better, or # additional, heuristic that should be applied? $is_binary = 0;
while (read(FILE, $data, 65536) > 0) { if ($data =~ /\0/) { $is_binary = 1; last; } }
if ($is_binary) { print STDERR "$name: $f: binary file\n"; next; }
seek(FILE, 0, 0);
$in_bytes = 0; $out_bytes = 0; $blank_bytes = 0;
@blanks = (); @lines = (); $lineno = 0;
while ( defined($line = <FILE>) ) { $lineno++; $in_bytes += length($line); $line =~ s/[ \t\r]*$//; # Remove trailing spaces $line = clean_space_tabs($line);
if ( $line eq "\n" ) { push(@blanks, $line); $blank_bytes += length($line); } else { push(@lines, @blanks); $out_bytes += $blank_bytes; push(@lines, $line); $out_bytes += length($line); @blanks = (); $blank_bytes = 0; }
$l_width = strwidth($line); if ($max_width && $l_width > $max_width) { print STDERR "$f:$lineno: line exceeds $max_width characters ($l_width)\n"; } }
# Any blanks at the end of the file are discarded
if ($in_bytes != $out_bytes) { # Only write to the file if changed seek(FILE, 0, 0); print FILE @lines;
if ( !defined($where = tell(FILE)) || !truncate(FILE, $where) ) { die "$name: Failed to truncate modified file: $f: $!\n"; } }
close(FILE);}