S├ębastien Aperghis-Tramoni
and 1 contributors

NAME

PerlIO::via::escape_ansi - PerlIO layer to escape ANSI sequences

VERSION

This is the documentation of PerlIO::via::escape_ansi version 0.01

SYNOPSIS

    # used as a PerlIO layer
    use PerlIO::via::escape_ansi;
    open my $fh, "<:via(escape_ansi)", $file or die $!;
    print <$fh>;

    # used as a function
    use PerlIO::via::escape_ansi -as_function;
    print escape_non_printable_chars($unsure_data);

DESCRIPTION

This module is a proof of concept and a very simple PerlIO layer for escaping non-printable characters, in order to prevent from shell attacks with ANSI sequences. The internal function can also be directly called.

Note: This is an experimental module, most probably with bugs and memory leaks, used as a prototype for the true module, PerlIO::escape_ansi which will be written using the XS API of PerlIO.

Examples

  • a sequence for making the text brighter or bold:

        "\e[1mbold text"

    becomes

        "<ESC>[1mbold text"
  • a sequence for setting the terminal title:

        "\e]0;OH HAI\a"

    becomes

        "<ESC>]0;OH HAI<BEL>"
  • a sequence that clears the screen, sets the cursor at a given position and prints a red blinking text:

        "\a\e[2J\e[2;5m\e[1;31mI CAN HAS UR PWNY\n\e[2;25m\e[22;30m\e[3q"

    becomes

        "<BEL><ESC>[2J<ESC>[2;5m<ESC>[1;31mI CAN HAS UR PWNY<LF><ESC>[2;25m<ESC>[22;30m<ESC>[3q"

EXPORT

No functions is exported by default, but you can import the escape_non_printable_chars() by calling the module with the argument -as_function:

    use PerlIO::via::escape_ansi -as_function;

FUNCTIONS

escape_non_printable_chars()

Direct call (minus the Perl and XS wrappers) to the internal C function that does the real work.

ACKNOWLEDGEMENT

Mark Overmeer, who suggested that such a module should be written (see RT-CPAN #41174).

AUTHOR

Sébastien Aperghis-Tramoni, <sebastien at aperghis.net>

BUGS

Please report any bugs or feature requests to bug-perlio-escape_ansi at rt.cpan.org, or through the web interface at http://rt.cpan.org/Dist/Display.html?Queue=PerlIO-escape_ansi. I will be notified, and then you'll automatically be notified of progress on your bug as I make changes.

SUPPORT

You can find documentation for this module with the perldoc command.

    perldoc PerlIO::escape_ansi

You can also look for information at:

COPYRIGHT & LICENSE

Copyright 2008, 2009 Sébastien Aperghis-Tramoni

This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.