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