Only use console window size if ioctl(TIOCGWINSZ) succeeded. (#418)

This avoids potentially using uninitialized data if ioctl fails. Also, zero-initialize the winsize struct to begin with.

Only use console window size if ioctl(TIOCGWINSZ) succeeded. (#418)

This avoids potentially using uninitialized data if ioctl fails. Also, zero-initialize the winsize struct to begin with.

Update doc Jamfile (#414)

Update doc Jamfile (#414)

update changelog

update changelog

update changelog

update changelog

update changelog

update changelog