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-rw-r--r--lib/sh/winsize.c104
1 files changed, 104 insertions, 0 deletions
diff --git a/lib/sh/winsize.c b/lib/sh/winsize.c
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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
+}