d75e970c9d
leave it in the command window. (tui_redisplay_readline): Save cursor position to restore the cursor after we go back from background. * tuiData.h (TuiCommandInfo): Add start_line member.
443 lines
12 KiB
C
443 lines
12 KiB
C
/* TUI support I/O functions.
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Copyright 1998, 1999, 2000, 2001 Free Software Foundation, Inc.
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Contributed by Hewlett-Packard Company.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <stdio.h>
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#include "defs.h"
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#include "terminal.h"
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#include "target.h"
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#include "event-loop.h"
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#include "command.h"
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#include "top.h"
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#include "readline/readline.h"
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#include "tui.h"
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#include "tuiData.h"
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#include "tuiIO.h"
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#include "tuiCommand.h"
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#include "tuiWin.h"
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#include "tuiGeneralWin.h"
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#include "tui-file.h"
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#include "ui-out.h"
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#include "cli-out.h"
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#include <fcntl.h>
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#include <signal.h>
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/* This file controls the IO interactions between gdb and curses.
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When the TUI is enabled, gdb has two modes a curses and a standard
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mode.
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In curses mode, the gdb outputs are made in a curses command window.
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For this, the gdb_stdout and gdb_stderr are redirected to the specific
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ui_file implemented by TUI. The output is handled by tui_puts().
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The input is also controlled by curses with tui_getc(). The readline
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library uses this function to get its input. Several readline hooks
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are installed to redirect readline output to the TUI (see also the
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note below).
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In normal mode, the gdb outputs are restored to their origin, that
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is as if TUI is not used. Readline also uses its original getc()
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function with stdin.
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Note: the current readline is not clean in its management of the output.
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Even if we install a redisplay handler, it sometimes writes on a stdout
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file. It is important to redirect every output produced by readline,
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otherwise the curses window will be garbled. This is implemented with
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a pipe that TUI reads and readline writes to. A gdb input handler
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is created so that reading the pipe is handled automatically.
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This will probably not work on non-Unix platforms. The best fix is
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to make readline clean enougth so that is never write on stdout. */
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/* TUI output files. */
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static struct ui_file *tui_stdout;
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static struct ui_file *tui_stderr;
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static struct ui_out *tui_out;
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/* GDB output files in non-curses mode. */
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static struct ui_file *tui_old_stdout;
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static struct ui_file *tui_old_stderr;
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static struct ui_out *tui_old_uiout;
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/* Readline previous hooks. */
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static Function *tui_old_rl_getc_function;
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static VFunction *tui_old_rl_redisplay_function;
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static VFunction *tui_old_rl_prep_terminal;
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static VFunction *tui_old_rl_deprep_terminal;
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static int tui_old_readline_echoing_p;
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/* Readline output stream.
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Should be removed when readline is clean. */
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static FILE *tui_rl_outstream;
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static FILE *tui_old_rl_outstream;
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static int tui_readline_pipe[2];
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static unsigned int _tuiHandleResizeDuringIO (unsigned int);
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/* Print the string in the curses command window. */
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void
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tui_puts (const char *string)
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{
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static int tui_skip_line = -1;
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char c;
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WINDOW *w;
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w = cmdWin->generic.handle;
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while ((c = *string++) != 0)
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{
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/* Catch annotation and discard them. We need two \032 and
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discard until a \n is seen. */
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if (c == '\032')
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{
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tui_skip_line++;
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}
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else if (tui_skip_line != 1)
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{
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tui_skip_line = -1;
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waddch (w, c);
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}
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else if (c == '\n')
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tui_skip_line = -1;
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}
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getyx (w, cmdWin->detail.commandInfo.curLine,
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cmdWin->detail.commandInfo.curch);
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cmdWin->detail.commandInfo.start_line = cmdWin->detail.commandInfo.curLine;
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/* We could defer the following. */
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wrefresh (w);
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fflush (stdout);
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}
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/* Readline callback.
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Redisplay the command line with its prompt after readline has
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changed the edited text. */
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static void
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tui_redisplay_readline (void)
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{
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int prev_col;
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int height;
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int col, line;
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int c_pos;
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int c_line;
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int in;
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WINDOW *w;
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char *prompt;
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int start_line;
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prompt = get_prompt ();
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c_pos = -1;
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c_line = -1;
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w = cmdWin->generic.handle;
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start_line = cmdWin->detail.commandInfo.start_line;
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wmove (w, start_line, 0);
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prev_col = 0;
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height = 1;
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for (in = 0; prompt && prompt[in]; in++)
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{
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waddch (w, prompt[in]);
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getyx (w, line, col);
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if (col < prev_col)
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height++;
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prev_col = col;
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}
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for (in = 0; in < rl_end; in++)
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{
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unsigned char c;
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c = (unsigned char) rl_line_buffer[in];
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if (in == rl_point)
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{
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getyx (w, c_line, c_pos);
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}
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if (CTRL_CHAR (c) || c == RUBOUT)
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{
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waddch (w, '^');
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waddch (w, CTRL_CHAR (c) ? UNCTRL (c) : '?');
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}
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else
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{
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waddch (w, c);
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}
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if (c == '\n')
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{
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getyx (w, cmdWin->detail.commandInfo.start_line,
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cmdWin->detail.commandInfo.curch);
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}
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getyx (w, line, col);
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if (col < prev_col)
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height++;
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prev_col = col;
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}
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wclrtobot (w);
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getyx (w, cmdWin->detail.commandInfo.start_line,
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cmdWin->detail.commandInfo.curch);
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if (c_line >= 0)
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{
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wmove (w, c_line, c_pos);
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cmdWin->detail.commandInfo.curLine = c_line;
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cmdWin->detail.commandInfo.curch = c_pos;
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}
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cmdWin->detail.commandInfo.start_line -= height - 1;
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wrefresh (w);
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fflush(stdout);
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}
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/* Readline callback to prepare the terminal. It is called once
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each time we enter readline. There is nothing to do in curses mode. */
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static void
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tui_prep_terminal (void)
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{
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}
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/* Readline callback to restore the terminal. It is called once
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each time we leave readline. There is nothing to do in curses mode. */
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static void
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tui_deprep_terminal (void)
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{
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}
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/* Read readline output pipe and feed the command window with it.
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Should be removed when readline is clean. */
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static void
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tui_readline_output (int code, gdb_client_data data)
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{
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int size;
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char buf[256];
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size = read (tui_readline_pipe[0], buf, sizeof (buf) - 1);
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if (size > 0 && tui_active)
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{
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buf[size] = 0;
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tui_puts (buf);
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}
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}
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/* Setup the IO for curses or non-curses mode.
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- In non-curses mode, readline and gdb use the standard input and
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standard output/error directly.
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- In curses mode, the standard output/error is controlled by TUI
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with the tui_stdout and tui_stderr. The output is redirected in
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the curses command window. Several readline callbacks are installed
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so that readline asks for its input to the curses command window
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with wgetch(). */
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void
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tui_setup_io (int mode)
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{
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extern int readline_echoing_p;
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if (mode)
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{
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/* Redirect readline to TUI. */
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tui_old_rl_redisplay_function = rl_redisplay_function;
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tui_old_rl_deprep_terminal = rl_deprep_term_function;
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tui_old_rl_prep_terminal = rl_prep_term_function;
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tui_old_rl_getc_function = rl_getc_function;
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tui_old_rl_outstream = rl_outstream;
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tui_old_readline_echoing_p = readline_echoing_p;
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rl_redisplay_function = tui_redisplay_readline;
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rl_deprep_term_function = tui_deprep_terminal;
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rl_prep_term_function = tui_prep_terminal;
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rl_getc_function = tui_getc;
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readline_echoing_p = 0;
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rl_outstream = tui_rl_outstream;
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rl_prompt = 0;
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/* Keep track of previous gdb output. */
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tui_old_stdout = gdb_stdout;
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tui_old_stderr = gdb_stderr;
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tui_old_uiout = uiout;
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/* Reconfigure gdb output. */
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gdb_stdout = tui_stdout;
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gdb_stderr = tui_stderr;
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gdb_stdlog = gdb_stdout; /* for moment */
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gdb_stdtarg = gdb_stderr; /* for moment */
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uiout = tui_out;
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/* Save tty for SIGCONT. */
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savetty ();
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}
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else
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{
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/* Restore gdb output. */
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gdb_stdout = tui_old_stdout;
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gdb_stderr = tui_old_stderr;
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gdb_stdlog = gdb_stdout; /* for moment */
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gdb_stdtarg = gdb_stderr; /* for moment */
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uiout = tui_old_uiout;
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/* Restore readline. */
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rl_redisplay_function = tui_old_rl_redisplay_function;
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rl_deprep_term_function = tui_old_rl_deprep_terminal;
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rl_prep_term_function = tui_old_rl_prep_terminal;
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rl_getc_function = tui_old_rl_getc_function;
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rl_outstream = tui_old_rl_outstream;
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readline_echoing_p = tui_old_readline_echoing_p;
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/* Save tty for SIGCONT. */
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savetty ();
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}
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}
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#ifdef SIGCONT
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/* Catch SIGCONT to restore the terminal and refresh the screen. */
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static void
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tui_cont_sig (int sig)
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{
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if (tui_active)
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{
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/* Restore the terminal setting because another process (shell)
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might have changed it. */
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resetty ();
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/* Force a refresh of the screen. */
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tuiRefreshAll ();
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/* Update cursor position on the screen. */
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wmove (cmdWin->generic.handle,
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cmdWin->detail.commandInfo.start_line,
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cmdWin->detail.commandInfo.curch);
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wrefresh (cmdWin->generic.handle);
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}
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signal (sig, tui_cont_sig);
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}
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#endif
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/* Initialize the IO for gdb in curses mode. */
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void
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tui_initialize_io ()
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{
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#ifdef SIGCONT
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signal (SIGCONT, tui_cont_sig);
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#endif
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/* Create tui output streams. */
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tui_stdout = tui_fileopen (stdout);
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tui_stderr = tui_fileopen (stderr);
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tui_out = tui_out_new (tui_stdout);
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/* Create the default UI. It is not created because we installed
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a init_ui_hook. */
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uiout = cli_out_new (gdb_stdout);
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/* Temporary solution for readline writing to stdout:
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redirect readline output in a pipe, read that pipe and
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output the content in the curses command window. */
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if (pipe (tui_readline_pipe) != 0)
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{
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fprintf_unfiltered (gdb_stderr, "Cannot create pipe for readline");
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exit (1);
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}
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tui_rl_outstream = fdopen (tui_readline_pipe[1], "w");
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if (tui_rl_outstream == 0)
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{
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fprintf_unfiltered (gdb_stderr, "Cannot redirect readline output");
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exit (1);
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}
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setlinebuf (tui_rl_outstream);
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#ifdef O_NONBLOCK
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(void) fcntl (tui_readline_pipe[0], F_SETFL, O_NONBLOCK);
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#else
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#ifdef O_NDELAY
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(void) fcntl (tui_readline_pipe[0], F_SETFL, O_NDELAY);
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#endif
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#endif
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add_file_handler (tui_readline_pipe[0], tui_readline_output, 0);
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}
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/* Get a character from the command window. This is called from the readline
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package. */
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int
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tui_getc (FILE *fp)
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{
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int ch;
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WINDOW *w;
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w = cmdWin->generic.handle;
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/* Flush readline output. */
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tui_readline_output (GDB_READABLE, 0);
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ch = wgetch (w);
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ch = _tuiHandleResizeDuringIO (ch);
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/* The \n must be echoed because it will not be printed by readline. */
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if (ch == '\n')
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{
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/* When hitting return with an empty input, gdb executes the last
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command. If we emit a newline, this fills up the command window
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with empty lines with gdb prompt at beginning. Instead of that,
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stay on the same line but provide a visual effect to show the
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user we recognized the command. */
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if (rl_end == 0)
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{
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wmove (w, cmdWin->detail.commandInfo.curLine, 0);
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/* Clear the line. This will blink the gdb prompt since
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it will be redrawn at the same line. */
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wclrtoeol (w);
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wrefresh (w);
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napms (20);
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}
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else
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{
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wmove (w, cmdWin->detail.commandInfo.curLine,
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cmdWin->detail.commandInfo.curch);
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waddch (w, ch);
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}
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}
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if (m_isCommandChar (ch))
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{ /* Handle prev/next/up/down here */
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ch = tuiDispatchCtrlChar (ch);
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}
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if (ch == '\n' || ch == '\r' || ch == '\f')
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cmdWin->detail.commandInfo.curch = 0;
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#if 0
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else
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tuiIncrCommandCharCountBy (1);
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#endif
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if (ch == KEY_BACKSPACE)
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return '\b';
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return ch;
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}
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/* Cleanup when a resize has occured.
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Returns the character that must be processed. */
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static unsigned int
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_tuiHandleResizeDuringIO (unsigned int originalCh)
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{
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if (tuiWinResized ())
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{
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tuiRefreshAll ();
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dont_repeat ();
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tuiSetWinResizedTo (FALSE);
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return '\n';
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}
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else
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return originalCh;
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}
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