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/* winsize.c - handle window size changes and information. */
/* Copyright (C) 2005-2020 Free Software Foundation, Inc.
This file is part of GNU Bash, the Bourne Again SHell.
Bash 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 3 of the License, or
(at your option) any later version.
Bash 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 Bash. If not, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <stdc.h>
#include "bashtypes.h"
#if defined (HAVE_UNISTD_H)
# include <unistd.h>
#endif
#include <sys/ioctl.h>
/* Try to find the definitions of `struct winsize' and TIOGCWINSZ */
#if 0
#if defined (GWINSZ_IN_SYS_IOCTL) && !defined (TIOCGWINSZ)
# include <sys/ioctl.h>
#endif /* GWINSZ_IN_SYS_IOCTL && !TIOCGWINSZ */
#endif
#if defined (STRUCT_WINSIZE_IN_TERMIOS) && !defined (STRUCT_WINSIZE_IN_SYS_IOCTL)
# include <termios.h>
#endif /* STRUCT_WINSIZE_IN_TERMIOS && !STRUCT_WINSIZE_IN_SYS_IOCTL */
/* Not in either of the standard places, look around. */
#if !defined (STRUCT_WINSIZE_IN_TERMIOS) && !defined (STRUCT_WINSIZE_IN_SYS_IOCTL)
# if defined (HAVE_SYS_STREAM_H)
# include <sys/stream.h>
# endif /* HAVE_SYS_STREAM_H */
# if defined (HAVE_SYS_PTEM_H) /* SVR4.2, at least, has it here */
# include <sys/ptem.h>
# define _IO_PTEM_H /* work around SVR4.2 1.1.4 bug */
# endif /* HAVE_SYS_PTEM_H */
# if defined (HAVE_SYS_PTE_H) /* ??? */
# include <sys/pte.h>
# endif /* HAVE_SYS_PTE_H */
#endif /* !STRUCT_WINSIZE_IN_TERMIOS && !STRUCT_WINSIZE_IN_SYS_IOCTL */
#include <stdio.h>
/* Return the fd from which we are actually getting input. */
#define input_tty() (shell_tty != -1) ? shell_tty : fileno (stderr)
#if !defined (errno)
extern int errno;
#endif /* !errno */
extern int shell_tty;
#if defined (READLINE)
/* Let's not call readline, forcing readline to initialize the termcap/terminfo
variables it needs, unless we have to. */
extern int interactive_shell;
extern int no_line_editing;
extern int bash_readline_initialized;
extern void rl_set_screen_size PARAMS((int, int));
#endif
extern void sh_set_lines_and_columns PARAMS((int, int));
void
get_new_window_size (from_sig, rp, cp)
int from_sig;
int *rp, *cp;
{
#if defined (TIOCGWINSZ)
struct winsize win;
int tty;
tty = input_tty ();
if (tty >= 0 && (ioctl (tty, TIOCGWINSZ, &win) == 0) &&
win.ws_row > 0 && win.ws_col > 0)
{
sh_set_lines_and_columns (win.ws_row, win.ws_col);
#if defined (READLINE)
if ((interactive_shell && no_line_editing == 0) || bash_readline_initialized)
rl_set_screen_size (win.ws_row, win.ws_col);
#endif
if (rp)
*rp = win.ws_row;
if (cp)
*cp = win.ws_col;
}
#endif
}
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