linux-yocto/scripts/cleanpatch

#!/usr/bin/perl -w

Clean a patch file -- or directory of patch files -- of stealth whitespace.

WARNING: this can be a highly destructive operation. Use with caution.

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);

}