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cleanpatch

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#!/usr/bin/env perl

# SPDX-License-Identifier: GPL-2.0

#

# Clean a patch file -- or directory of patch 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 string

sub 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;

$lineno = 0;

@lines = ();

$in_hunk = 0;

$err = 0;

while ( defined($line = <FILE>) ) {

$lineno++;

$in_bytes += length($line);

if (!$in_hunk) {

if ($line =~

/^\@\@\s+\-([0-9]+),([0-9]+)\s+\+([0-9]+),([0-9]+)\s\@\@/) {

$minus_lines = $2;

$plus_lines = $4;

if ($minus_lines || $plus_lines) {

$in_hunk = 1;

@hunk_lines = ($line);

}

} else {

push(@lines, $line);

$out_bytes += length($line);

}

} else {

# We're in a hunk

if ($line =~ /^\+/) {

$plus_lines--;

$text = substr($line, 1);

$text =~ s/[ \t\r]*$//; # Remove trailing spaces

$text = clean_space_tabs($text);

$l_width = strwidth($text);

if ($max_width && $l_width > $max_width) {

print STDERR

"$f:$lineno: adds line exceeds $max_width ",

"characters ($l_width)\n";

}

push(@hunk_lines, '+'.$text);

} elsif ($line =~ /^\-/) {

$minus_lines--;

push(@hunk_lines, $line);

} elsif ($line =~ /^ /) {

$plus_lines--;

$minus_lines--;

push(@hunk_lines, $line);

} else {

print STDERR "$name: $f: malformed patch\n";

$err = 1;

last;

}

if ($plus_lines < 0 || $minus_lines < 0) {

print STDERR "$name: $f: malformed patch\n";

$err = 1;

last;

} elsif ($plus_lines == 0 && $minus_lines == 0) {

# End of a hunk. Process this hunk.

my $i;

my $l;

my @h = ();

my $adj = 0;

my $done = 0;

for ($i = scalar(@hunk_lines)-1; $i > 0; $i--) {

$l = $hunk_lines[$i];

if (!$done && $l eq "+\n") {

$adj++; # Skip this line

} elsif ($l =~ /^[ +]/) {

$done = 1;

unshift(@h, $l);

} else {

unshift(@h, $l);

}

}

$l = $hunk_lines[0]; # Hunk header

undef @hunk_lines; # Free memory

if ($adj) {

die unless

($l =~ /^\@\@\s+\-([0-9]+),([0-9]+)\s+\+([0-9]+),([0-9]+)\s\@\@(.*)$/);

my $mstart = $1;

my $mlin = $2;

my $pstart = $3;

my $plin = $4;

my $tail = $5; # doesn't include the final newline

$l = sprintf("@@ -%d,%d +%d,%d @@%s\n",

$mstart, $mlin, $pstart, $plin-$adj,

$tail);

}

unshift(@h, $l);

# Transfer to the output array

foreach $l (@h) {

$out_bytes += length($l);

push(@lines, $l);

}

$in_hunk = 0;

}

}

}

if ($in_hunk) {

print STDERR "$name: $f: malformed patch\n";

$err = 1;

}

if (!$err) {

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);

}