lib/sh/winsize.c

   1 /* winsize.c - handle window size changes and information. */
   2
   3 /* Copyright (C) 2005-2020 Free Software Foundation, Inc.
   4
   5    This file is part of GNU Bush, the Bourne Again SHell.
   6
   7    Bush 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    Bush 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 Bush.  If not, see <http://www.gnu.org/licenses/>.
  19 */
  20
  21 #include "config.h"
  22
  23 #include <stdc.h>
  24
  25 #include "bushtypes.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 PARAMS((int, int));
  72 #endif
  73 extern void sh_set_lines_and_columns PARAMS((int, int));
  74
  75 void
  76 get_new_window_size (from_sig, rp, cp)
  77      int from_sig;
  78      int *rp, *cp;
  79 {
  80 #if defined (TIOCGWINSZ)
  81   struct winsize win;
  82   int tty;
  83
  84   tty = input_tty ();
  85   if (tty >= 0 && (ioctl (tty, TIOCGWINSZ, &win) == 0) &&
  86       win.ws_row > 0 && win.ws_col > 0)
  87     {
  88       sh_set_lines_and_columns (win.ws_row, win.ws_col);
  89 #if defined (READLINE)
  90       rl_set_screen_size (win.ws_row, win.ws_col);
  91       if (rp)
  92         *rp = win.ws_row;
  93       if (cp)
  94         *cp = win.ws_col;
  95 #endif
  96     }
  97 #endif
  98 }