1/* winsize.c - 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
8   it under the terms of the GNU General Public License as published by
9   the Free Software Foundation, either version 3 of the License, or
10   (at your option) any later version.
11
12   Bash is distributed in the hope that it will be useful,
13   but WITHOUT ANY WARRANTY; without even the implied warranty of
14   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15   GNU General Public License for more details.
16
17   You should have received a copy of the GNU General Public License
18   along with Bash.  If not, see <http://www.gnu.org/licenses/>.
19*/
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/* Try to find the definitions of `struct winsize' and TIOGCWINSZ */
34
35#if defined (GWINSZ_IN_SYS_IOCTL) && !defined (TIOCGWINSZ)
36#  include <sys/ioctl.h>
37#endif /* GWINSZ_IN_SYS_IOCTL && !TIOCGWINSZ */
38
39#if defined (STRUCT_WINSIZE_IN_TERMIOS) && !defined (STRUCT_WINSIZE_IN_SYS_IOCTL)
40#  include <termios.h>
41#endif /* STRUCT_WINSIZE_IN_TERMIOS && !STRUCT_WINSIZE_IN_SYS_IOCTL */
42
43/* Not in either of the standard places, look around. */
44#if !defined (STRUCT_WINSIZE_IN_TERMIOS) && !defined (STRUCT_WINSIZE_IN_SYS_IOCTL)
45#  if defined (HAVE_SYS_STREAM_H)
46#    include <sys/stream.h>
47#  endif /* HAVE_SYS_STREAM_H */
48#  if defined (HAVE_SYS_PTEM_H) /* SVR4.2, at least, has it here */
49#    include <sys/ptem.h>
50#    define _IO_PTEM_H          /* work around SVR4.2 1.1.4 bug */
51#  endif /* HAVE_SYS_PTEM_H */
52#  if defined (HAVE_SYS_PTE_H)  /* ??? */
53#    include <sys/pte.h>
54#  endif /* HAVE_SYS_PTE_H */
55#endif /* !STRUCT_WINSIZE_IN_TERMIOS && !STRUCT_WINSIZE_IN_SYS_IOCTL */
56
57#include <stdio.h>
58
59/* Return the fd from which we are actually getting input. */
60#define input_tty() (shell_tty != -1) ? shell_tty : fileno (stderr)
61
62#if !defined (errno)
63extern int errno;
64#endif /* !errno */
65
66extern int shell_tty;
67
68#if defined (READLINE)
69extern void rl_set_screen_size __P((int, int));
70#endif
71extern void sh_set_lines_and_columns __P((int, int));
72
73void
74get_new_window_size (from_sig, rp, cp)
75     int from_sig;
76     int *rp, *cp;
77{
78#if defined (TIOCGWINSZ)
79  struct winsize win;
80  int tty;
81
82  tty = input_tty ();
83  if (tty >= 0 && (ioctl (tty, TIOCGWINSZ, &win) == 0) &&
84      win.ws_row > 0 && win.ws_col > 0)
85    {
86      sh_set_lines_and_columns (win.ws_row, win.ws_col);
87#if defined (READLINE)
88      rl_set_screen_size (win.ws_row, win.ws_col);
89      if (rp)
90	*rp = win.ws_row;
91      if (cp)
92	*cp = win.ws_col;
93#endif
94    }
95#endif
96}
97