/* Line length calculation routine.   Taken from fileutils-4.0i/src/ls.c   Copyright (C) 85, 88, 90, 91, 1995-1999 Free Software Foundation, Inc.   This program is free software; you can redistribute it and/or modify   it under the terms of the GNU General Public License as published by   the Free Software Foundation; either version 2, or (at your option)   any later version.   This program is distributed in the hope that it will be useful,   but WITHOUT ANY WARRANTY; without even the implied warranty of   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the   GNU General Public License for more details.   You should have received a copy of the GNU General Public License   along with this program; if not, write to the Free Software Foundation,   Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.    $Id: linelen.c,v 1.1 1999/06/25 19:26:46 joe Exp $  */#if HAVE_TERMIOS_H# include <termios.h>#endif#ifdef GWINSZ_IN_SYS_IOCTL# include <sys/ioctl.h>#endif#ifdef WINSIZE_IN_PTEM# include <sys/stream.h># include <sys/ptem.h>#endif#ifdef HAVE_UNISTD_H#include <unistd.h> /* For STDOUT_FILENO */#endif#define DEFAULT_LINE_LENGTH 80int get_line_length( void ) {    int ret = DEFAULT_LINE_LENGTH;/* joe: Some systems do this with a 'struct ttysize'? * There is code in tin to do it, but tin has a dodgy license. * DIY, if you have such a system. */#ifdef TIOCGWINSZ    struct winsize ws;        if (ioctl (STDOUT_FILENO, TIOCGWINSZ, &ws) != -1 && ws.ws_col != 0)	ret = ws.ws_col;    #endif    return ret;}