9b8d682720
while executing the gdb command. (tui_rl_startup_hook): Do not switch back to TUI_SINGLE_KEY_MODE if we are called from prompt_for_continue. * tui/tui-io.c (tui_redisplay_readline): Likewise.
718 lines
20 KiB
C
718 lines
20 KiB
C
/* TUI support I/O functions.
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Copyright (C) 1998-2004, 2007-2012 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 3 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, see <http://www.gnu.org/licenses/>. */
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#include "defs.h"
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#include "target.h"
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#include "event-loop.h"
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#include "event-top.h"
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#include "command.h"
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#include "top.h"
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#include "tui/tui.h"
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#include "tui/tui-data.h"
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#include "tui/tui-io.h"
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#include "tui/tui-command.h"
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#include "tui/tui-win.h"
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#include "tui/tui-wingeneral.h"
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#include "tui/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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#include <stdio.h>
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#include "gdb_curses.h"
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/* This redefines CTRL if it is not already defined, so it must come
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after terminal state releated include files like <term.h> and
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"gdb_curses.h". */
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#include "readline/readline.h"
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int
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key_is_start_sequence (int ch)
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{
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return (ch == 27);
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}
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int
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key_is_end_sequence (int ch)
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{
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return (ch == 126);
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}
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int
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key_is_backspace (int ch)
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{
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return (ch == 8);
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}
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int
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key_is_command_char (int ch)
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{
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return ((ch == KEY_NPAGE) || (ch == KEY_PPAGE)
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|| (ch == KEY_LEFT) || (ch == KEY_RIGHT)
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|| (ch == KEY_UP) || (ch == KEY_DOWN)
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|| (ch == KEY_SF) || (ch == KEY_SR)
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|| (ch == (int)'\f')
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|| key_is_start_sequence (ch));
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}
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/* Use definition from readline 4.3. */
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#undef CTRL_CHAR
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#define CTRL_CHAR(c) \
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((c) < control_character_threshold && (((c) & 0x80) == 0))
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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
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window. For this, the gdb_stdout and gdb_stderr are redirected to
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the specific ui_file implemented by TUI. The output is handled by
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tui_puts(). The input is also controlled by curses with
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tui_getc(). The readline library uses this function to get its
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input. Several readline hooks are installed to redirect readline
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output to the TUI (see also the 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 SCz/2001-07-21: the current readline is not clean in its
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management of the output. Even if we install a redisplay handler,
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it sometimes writes on a stdout file. It is important to redirect
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every output produced by readline, otherwise the curses window will
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be garbled. This is implemented with a pipe that TUI reads and
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readline writes to. A gdb input handler is created so that reading
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the pipe is handled automatically. This will probably not work on
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non-Unix platforms. The best fix is to make readline clean enougth
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so that is never write on stdout.
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Note SCz/2002-09-01: we now use more readline hooks and it seems
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that with them we don't need the pipe anymore (verified by creating
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the pipe and closing its end so that write causes a SIGPIPE). The
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old pipe code is still there and can be conditionally removed by
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#undef TUI_USE_PIPE_FOR_READLINE. */
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/* For gdb 5.3, prefer to continue the pipe hack as a backup wheel. */
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#ifdef HAVE_PIPE
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#define TUI_USE_PIPE_FOR_READLINE
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#endif
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/* #undef TUI_USE_PIPE_FOR_READLINE */
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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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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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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_rl_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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#ifdef TUI_USE_PIPE_FOR_READLINE
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static int tui_readline_pipe[2];
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#endif
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/* The last gdb prompt that was registered in readline.
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This may be the main gdb prompt or a secondary prompt. */
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static char *tui_rl_saved_prompt;
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static unsigned int tui_handle_resize_during_io (unsigned int);
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static void
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tui_putc (char c)
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{
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char buf[2];
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buf[0] = c;
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buf[1] = 0;
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tui_puts (buf);
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}
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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 = TUI_CMD_WIN->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, TUI_CMD_WIN->detail.command_info.cur_line,
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TUI_CMD_WIN->detail.command_info.curch);
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TUI_CMD_WIN->detail.command_info.start_line
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= TUI_CMD_WIN->detail.command_info.cur_line;
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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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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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/* Detect when we temporarily left SingleKey and now the readline
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edit buffer is empty, automatically restore the SingleKey
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mode. The restore must only be done if the command has finished.
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The command could call prompt_for_continue and we must not
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restore SingleKey so that the prompt and normal keymap are used. */
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if (tui_current_key_mode == TUI_ONE_COMMAND_MODE && rl_end == 0
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&& immediate_quit == 0)
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tui_set_key_mode (TUI_SINGLE_KEY_MODE);
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if (tui_current_key_mode == TUI_SINGLE_KEY_MODE)
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prompt = "";
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else
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prompt = tui_rl_saved_prompt;
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c_pos = -1;
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c_line = -1;
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w = TUI_CMD_WIN->generic.handle;
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start_line = TUI_CMD_WIN->detail.command_info.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, TUI_CMD_WIN->detail.command_info.start_line,
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TUI_CMD_WIN->detail.command_info.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, TUI_CMD_WIN->detail.command_info.start_line,
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TUI_CMD_WIN->detail.command_info.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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TUI_CMD_WIN->detail.command_info.cur_line = c_line;
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TUI_CMD_WIN->detail.command_info.curch = c_pos;
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}
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TUI_CMD_WIN->detail.command_info.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 each
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time we enter readline. Terminal is already setup in curses
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mode. */
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static void
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tui_prep_terminal (int notused1)
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{
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/* Save the prompt registered in readline to correctly display it.
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(we can't use gdb_prompt() due to secondary prompts and can't use
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rl_prompt because it points to an alloca buffer). */
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xfree (tui_rl_saved_prompt);
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tui_rl_saved_prompt = xstrdup (rl_prompt);
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}
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/* Readline callback to restore the terminal. It is called once each
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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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#ifdef TUI_USE_PIPE_FOR_READLINE
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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 error, 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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#endif
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/* Return the portion of PATHNAME that should be output when listing
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possible completions. If we are hacking filename completion, we
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are only interested in the basename, the portion following the
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final slash. Otherwise, we return what we were passed.
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Comes from readline/complete.c. */
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static const char *
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printable_part (const char *pathname)
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{
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return rl_filename_completion_desired ? lbasename (pathname) : pathname;
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}
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/* Output TO_PRINT to rl_outstream. If VISIBLE_STATS is defined and
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we are using it, check for and output a single character for
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`special' filenames. Return the number of characters we
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output. */
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#define PUTX(c) \
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do { \
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if (CTRL_CHAR (c)) \
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{ \
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tui_puts ("^"); \
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tui_putc (UNCTRL (c)); \
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printed_len += 2; \
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} \
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else if (c == RUBOUT) \
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{ \
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tui_puts ("^?"); \
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printed_len += 2; \
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} \
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else \
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{ \
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tui_putc (c); \
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printed_len++; \
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} \
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} while (0)
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static int
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print_filename (const char *to_print, const char *full_pathname)
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{
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int printed_len = 0;
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const char *s;
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for (s = to_print; *s; s++)
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{
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PUTX (*s);
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}
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return printed_len;
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}
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/* The user must press "y" or "n". Non-zero return means "y" pressed.
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Comes from readline/complete.c. */
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static int
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get_y_or_n (void)
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{
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extern int _rl_abort_internal ();
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int c;
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for (;;)
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{
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c = rl_read_key ();
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if (c == 'y' || c == 'Y' || c == ' ')
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return (1);
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if (c == 'n' || c == 'N' || c == RUBOUT)
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return (0);
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if (c == ABORT_CHAR)
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_rl_abort_internal ();
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beep ();
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}
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}
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/* A convenience function for displaying a list of strings in
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columnar format on readline's output stream. MATCHES is the list
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of strings, in argv format, LEN is the number of strings in MATCHES,
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and MAX is the length of the longest string in MATCHES.
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Comes from readline/complete.c and modified to write in
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the TUI command window using tui_putc/tui_puts. */
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static void
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tui_rl_display_match_list (char **matches, int len, int max)
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{
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typedef int QSFUNC (const void *, const void *);
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extern int _rl_qsort_string_compare (const void *,
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const void *);
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extern int _rl_print_completions_horizontally;
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int count, limit, printed_len;
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int i, j, k, l;
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const char *temp;
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/* Screen dimension correspond to the TUI command window. */
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int screenwidth = TUI_CMD_WIN->generic.width;
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/* If there are many items, then ask the user if she really wants to
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see them all. */
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if (len >= rl_completion_query_items)
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{
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char msg[256];
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sprintf (msg, "\nDisplay all %d possibilities? (y or n)", len);
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tui_puts (msg);
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if (get_y_or_n () == 0)
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{
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tui_puts ("\n");
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return;
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}
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}
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/* How many items of MAX length can we fit in the screen window? */
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max += 2;
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limit = screenwidth / max;
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if (limit != 1 && (limit * max == screenwidth))
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limit--;
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/* Avoid a possible floating exception. If max > screenwidth, limit
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will be 0 and a divide-by-zero fault will result. */
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if (limit == 0)
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limit = 1;
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/* How many iterations of the printing loop? */
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count = (len + (limit - 1)) / limit;
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/* Watch out for special case. If LEN is less than LIMIT, then
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just do the inner printing loop.
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0 < len <= limit implies count = 1. */
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/* Sort the items if they are not already sorted. */
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if (rl_ignore_completion_duplicates == 0)
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qsort (matches + 1, len, sizeof (char *),
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(QSFUNC *)_rl_qsort_string_compare);
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tui_putc ('\n');
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if (_rl_print_completions_horizontally == 0)
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{
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/* Print the sorted items, up-and-down alphabetically, like ls. */
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for (i = 1; i <= count; i++)
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{
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for (j = 0, l = i; j < limit; j++)
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{
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if (l > len || matches[l] == 0)
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break;
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else
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{
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temp = printable_part (matches[l]);
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printed_len = print_filename (temp, matches[l]);
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if (j + 1 < limit)
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for (k = 0; k < max - printed_len; k++)
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tui_putc (' ');
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}
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l += count;
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}
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tui_putc ('\n');
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}
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}
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else
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{
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/* Print the sorted items, across alphabetically, like ls -x. */
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for (i = 1; matches[i]; i++)
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{
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temp = printable_part (matches[i]);
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printed_len = print_filename (temp, matches[i]);
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/* Have we reached the end of this line? */
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if (matches[i+1])
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{
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if (i && (limit > 1) && (i % limit) == 0)
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tui_putc ('\n');
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else
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for (k = 0; k < max - printed_len; k++)
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tui_putc (' ');
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}
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}
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tui_putc ('\n');
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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 _rl_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;
|
|
tui_old_rl_getc_function = rl_getc_function;
|
|
tui_old_rl_outstream = rl_outstream;
|
|
tui_old_rl_echoing_p = _rl_echoing_p;
|
|
rl_redisplay_function = tui_redisplay_readline;
|
|
rl_deprep_term_function = tui_deprep_terminal;
|
|
rl_prep_term_function = tui_prep_terminal;
|
|
rl_getc_function = tui_getc;
|
|
_rl_echoing_p = 0;
|
|
rl_outstream = tui_rl_outstream;
|
|
rl_prompt = 0;
|
|
rl_completion_display_matches_hook = tui_rl_display_match_list;
|
|
rl_already_prompted = 0;
|
|
|
|
/* Keep track of previous gdb output. */
|
|
tui_old_stdout = gdb_stdout;
|
|
tui_old_stderr = gdb_stderr;
|
|
tui_old_uiout = current_uiout;
|
|
|
|
/* Reconfigure gdb output. */
|
|
gdb_stdout = tui_stdout;
|
|
gdb_stderr = tui_stderr;
|
|
gdb_stdlog = gdb_stdout; /* for moment */
|
|
gdb_stdtarg = gdb_stderr; /* for moment */
|
|
gdb_stdtargerr = gdb_stderr; /* for moment */
|
|
current_uiout = tui_out;
|
|
|
|
/* Save tty for SIGCONT. */
|
|
savetty ();
|
|
}
|
|
else
|
|
{
|
|
/* Restore gdb output. */
|
|
gdb_stdout = tui_old_stdout;
|
|
gdb_stderr = tui_old_stderr;
|
|
gdb_stdlog = gdb_stdout; /* for moment */
|
|
gdb_stdtarg = gdb_stderr; /* for moment */
|
|
gdb_stdtargerr = gdb_stderr; /* for moment */
|
|
current_uiout = tui_old_uiout;
|
|
|
|
/* Restore readline. */
|
|
rl_redisplay_function = tui_old_rl_redisplay_function;
|
|
rl_deprep_term_function = tui_old_rl_deprep_terminal;
|
|
rl_prep_term_function = tui_old_rl_prep_terminal;
|
|
rl_getc_function = tui_old_rl_getc_function;
|
|
rl_outstream = tui_old_rl_outstream;
|
|
rl_completion_display_matches_hook = 0;
|
|
_rl_echoing_p = tui_old_rl_echoing_p;
|
|
rl_already_prompted = 0;
|
|
|
|
/* Save tty for SIGCONT. */
|
|
savetty ();
|
|
}
|
|
}
|
|
|
|
#ifdef SIGCONT
|
|
/* Catch SIGCONT to restore the terminal and refresh the screen. */
|
|
static void
|
|
tui_cont_sig (int sig)
|
|
{
|
|
if (tui_active)
|
|
{
|
|
/* Restore the terminal setting because another process (shell)
|
|
might have changed it. */
|
|
resetty ();
|
|
|
|
/* Force a refresh of the screen. */
|
|
tui_refresh_all_win ();
|
|
|
|
/* Update cursor position on the screen. */
|
|
wmove (TUI_CMD_WIN->generic.handle,
|
|
TUI_CMD_WIN->detail.command_info.start_line,
|
|
TUI_CMD_WIN->detail.command_info.curch);
|
|
wrefresh (TUI_CMD_WIN->generic.handle);
|
|
}
|
|
signal (sig, tui_cont_sig);
|
|
}
|
|
#endif
|
|
|
|
/* Initialize the IO for gdb in curses mode. */
|
|
void
|
|
tui_initialize_io (void)
|
|
{
|
|
#ifdef SIGCONT
|
|
signal (SIGCONT, tui_cont_sig);
|
|
#endif
|
|
|
|
/* Create tui output streams. */
|
|
tui_stdout = tui_fileopen (stdout);
|
|
tui_stderr = tui_fileopen (stderr);
|
|
tui_out = tui_out_new (tui_stdout);
|
|
|
|
/* Create the default UI. It is not created because we installed a
|
|
deprecated_init_ui_hook. */
|
|
tui_old_uiout = cli_out_new (gdb_stdout);
|
|
|
|
#ifdef TUI_USE_PIPE_FOR_READLINE
|
|
/* Temporary solution for readline writing to stdout: redirect
|
|
readline output in a pipe, read that pipe and output the content
|
|
in the curses command window. */
|
|
if (pipe (tui_readline_pipe) != 0)
|
|
{
|
|
fprintf_unfiltered (gdb_stderr, "Cannot create pipe for readline");
|
|
exit (1);
|
|
}
|
|
tui_rl_outstream = fdopen (tui_readline_pipe[1], "w");
|
|
if (tui_rl_outstream == 0)
|
|
{
|
|
fprintf_unfiltered (gdb_stderr, "Cannot redirect readline output");
|
|
exit (1);
|
|
}
|
|
setvbuf (tui_rl_outstream, (char*) NULL, _IOLBF, 0);
|
|
|
|
#ifdef O_NONBLOCK
|
|
(void) fcntl (tui_readline_pipe[0], F_SETFL, O_NONBLOCK);
|
|
#else
|
|
#ifdef O_NDELAY
|
|
(void) fcntl (tui_readline_pipe[0], F_SETFL, O_NDELAY);
|
|
#endif
|
|
#endif
|
|
add_file_handler (tui_readline_pipe[0], tui_readline_output, 0);
|
|
#else
|
|
tui_rl_outstream = stdout;
|
|
#endif
|
|
}
|
|
|
|
/* Get a character from the command window. This is called from the
|
|
readline package. */
|
|
int
|
|
tui_getc (FILE *fp)
|
|
{
|
|
int ch;
|
|
WINDOW *w;
|
|
|
|
w = TUI_CMD_WIN->generic.handle;
|
|
|
|
#ifdef TUI_USE_PIPE_FOR_READLINE
|
|
/* Flush readline output. */
|
|
tui_readline_output (0, 0);
|
|
#endif
|
|
|
|
ch = wgetch (w);
|
|
ch = tui_handle_resize_during_io (ch);
|
|
|
|
/* The \n must be echoed because it will not be printed by
|
|
readline. */
|
|
if (ch == '\n')
|
|
{
|
|
/* When hitting return with an empty input, gdb executes the last
|
|
command. If we emit a newline, this fills up the command window
|
|
with empty lines with gdb prompt at beginning. Instead of that,
|
|
stay on the same line but provide a visual effect to show the
|
|
user we recognized the command. */
|
|
if (rl_end == 0)
|
|
{
|
|
wmove (w, TUI_CMD_WIN->detail.command_info.cur_line, 0);
|
|
|
|
/* Clear the line. This will blink the gdb prompt since
|
|
it will be redrawn at the same line. */
|
|
wclrtoeol (w);
|
|
wrefresh (w);
|
|
napms (20);
|
|
}
|
|
else
|
|
{
|
|
wmove (w, TUI_CMD_WIN->detail.command_info.cur_line,
|
|
TUI_CMD_WIN->detail.command_info.curch);
|
|
waddch (w, ch);
|
|
}
|
|
}
|
|
|
|
if (key_is_command_char (ch))
|
|
{ /* Handle prev/next/up/down here. */
|
|
ch = tui_dispatch_ctrl_char (ch);
|
|
}
|
|
|
|
if (ch == '\n' || ch == '\r' || ch == '\f')
|
|
TUI_CMD_WIN->detail.command_info.curch = 0;
|
|
if (ch == KEY_BACKSPACE)
|
|
return '\b';
|
|
|
|
return ch;
|
|
}
|
|
|
|
|
|
/* Cleanup when a resize has occured.
|
|
Returns the character that must be processed. */
|
|
static unsigned int
|
|
tui_handle_resize_during_io (unsigned int original_ch)
|
|
{
|
|
if (tui_win_resized ())
|
|
{
|
|
tui_resize_all ();
|
|
tui_refresh_all_win ();
|
|
dont_repeat ();
|
|
tui_set_win_resized_to (FALSE);
|
|
return '\n';
|
|
}
|
|
else
|
|
return original_ch;
|
|
}
|