Line data    Source code

       1             : /* winsize.c - handle window size changes and information. */
       2             : 
       3             : /* Copyright (C) 2005-2015 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 0
      36             : #if defined (GWINSZ_IN_SYS_IOCTL) && !defined (TIOCGWINSZ)
      37             : #  include <sys/ioctl.h>
      38             : #endif /* GWINSZ_IN_SYS_IOCTL && !TIOCGWINSZ */
      39             : #endif
      40             : 
      41             : #if defined (STRUCT_WINSIZE_IN_TERMIOS) && !defined (STRUCT_WINSIZE_IN_SYS_IOCTL)
      42             : #  include <termios.h>
      43             : #endif /* STRUCT_WINSIZE_IN_TERMIOS && !STRUCT_WINSIZE_IN_SYS_IOCTL */
      44             : 
      45             : /* Not in either of the standard places, look around. */
      46             : #if !defined (STRUCT_WINSIZE_IN_TERMIOS) && !defined (STRUCT_WINSIZE_IN_SYS_IOCTL)
      47             : #  if defined (HAVE_SYS_STREAM_H)
      48             : #    include <sys/stream.h>
      49             : #  endif /* HAVE_SYS_STREAM_H */
      50             : #  if defined (HAVE_SYS_PTEM_H) /* SVR4.2, at least, has it here */
      51             : #    include <sys/ptem.h>
      52             : #    define _IO_PTEM_H          /* work around SVR4.2 1.1.4 bug */
      53             : #  endif /* HAVE_SYS_PTEM_H */
      54             : #  if defined (HAVE_SYS_PTE_H)  /* ??? */
      55             : #    include <sys/pte.h>
      56             : #  endif /* HAVE_SYS_PTE_H */
      57             : #endif /* !STRUCT_WINSIZE_IN_TERMIOS && !STRUCT_WINSIZE_IN_SYS_IOCTL */
      58             : 
      59             : #include <stdio.h>
      60             : 
      61             : /* Return the fd from which we are actually getting input. */
      62             : #define input_tty() (shell_tty != -1) ? shell_tty : fileno (stderr)
      63             : 
      64             : #if !defined (errno)
      65             : extern int errno;
      66             : #endif /* !errno */
      67             : 
      68             : extern int shell_tty;
      69             : 
      70             : #if defined (READLINE)
      71             : extern void rl_set_screen_size __P((int, int));
      72             : #endif
      73             : extern void sh_set_lines_and_columns __P((int, int));
      74             : 
      75             : void
      76     7011183 : get_new_window_size (from_sig, rp, cp)
      77             :      int from_sig;
      78             :      int *rp, *cp;
      79             : {
      80             : #if defined (TIOCGWINSZ)
      81     7011183 :   struct winsize win;
      82     7011183 :   int tty;
      83             : 
      84     7011183 :   tty = input_tty ();
      85     7011183 :   if (tty >= 0 && (ioctl (tty, TIOCGWINSZ, &win) == 0) &&
      86           0 :       win.ws_row > 0 && win.ws_col > 0)
      87             :     {
      88           0 :       sh_set_lines_and_columns (win.ws_row, win.ws_col);
      89             : #if defined (READLINE)
      90           0 :       rl_set_screen_size (win.ws_row, win.ws_col);
      91           0 :       if (rp)
      92           0 :         *rp = win.ws_row;
      93           0 :       if (cp)
      94           0 :         *cp = win.ws_col;
      95             : #endif
      96             :     }
      97             : #endif
      98     7011183 : }