1/* Handle window size changes and information. */
2
3/* Copyright (C) 2005 Free Software Foundation, Inc.
4
5   This file is part of GNU Bash, the Bourne Again SHell.
6
7   Bash is free software; you can redistribute it and/or modify it under
8   the terms of the GNU General Public License as published by the Free
9   Software Foundation; either version 2, or (at your option) any later
10   version.
11
12   Bash is distributed in the hope that it will be useful, but WITHOUT ANY
13   WARRANTY; without even the implied warranty of MERCHANTABILITY or
14   FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
15   for more details.
16
17   You should have received a copy of the GNU General Public License along
18   with Bash; see the file COPYING.  If not, write to the Free Software
19   Foundation, 59 Temple Place, Suite 330, Boston, MA 02111 USA. */
20
21#include "config.h"
22
23#include <stdc.h>
24
25#include "bashtypes.h"
26
27#if defined (HAVE_UNISTD_H)
28#  include <unistd.h>
29#endif
30
31#include <sys/ioctl.h>
32
33#if !defined (STRUCT_WINSIZE_IN_SYS_IOCTL)
34/* For struct winsize on SCO */
35/*   sys/ptem.h has winsize but needs mblk_t from sys/stream.h */
36#  if defined (HAVE_SYS_PTEM_H) && defined (TIOCGWINSZ) && defined (SIGWINCH)
37#    if defined (HAVE_SYS_STREAM_H)
38#      include <sys/stream.h>
39#    endif
40#    include <sys/ptem.h>
41#  endif /* HAVE_SYS_PTEM_H && TIOCGWINSZ && SIGWINCH */
42#endif /* !STRUCT_WINSIZE_IN_SYS_IOCTL */
43
44#include <stdio.h>
45
46/* Return the fd from which we are actually getting input. */
47#define input_tty() (shell_tty != -1) ? shell_tty : fileno (stderr)
48
49#if !defined (errno)
50extern int errno;
51#endif /* !errno */
52
53extern int shell_tty;
54
55#if defined (READLINE)
56extern void rl_set_screen_size __P((int, int));
57#endif
58extern void sh_set_lines_and_columns __P((int, int));
59
60void
61get_new_window_size (from_sig, rp, cp)
62     int from_sig;
63     int *rp, *cp;
64{
65#if defined (TIOCGWINSZ)
66  struct winsize win;
67  int tty;
68
69  tty = input_tty ();
70  if (tty >= 0 && (ioctl (tty, TIOCGWINSZ, &win) == 0) &&
71      win.ws_row > 0 && win.ws_col > 0)
72    {
73      sh_set_lines_and_columns (win.ws_row, win.ws_col);
74#if defined (READLINE)
75      rl_set_screen_size (win.ws_row, win.ws_col);
76      if (rp)
77	*rp = win.ws_row;
78      if (cp)
79	*cp = win.ws_col;
80#endif
81    }
82#endif
83}
84