PC World Komputer 2010 April/PCWorld0410.iso/hity wydania/Ubuntu 9.10 PL/karmelkowy-koliberek-desktop-9.10-i386-PL.iso/casper/filesystem.squashfs/usr/src/linux-headers-2.6.31-14/scripts/cleanpatch

Text File | 2009-09-09 | 5KB | 259 lines

#!/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);
}