Subversion Repositories or1k_soc_on_altera_embedded_dev_kit

#!/usr/bin/perl -w

#

# Clean a text file -- or directory of text 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;

    $blank_bytes = 0;

    @blanks = ();

    @lines  = ();

    $lineno = 0;

    while ( defined($line = ) ) {

        $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);

}