d64e57faa8
This patch fixes the annoying bug where key sequences such as Alt_F or Alt_B (go forward or backwards by a word) do not behave promptly in TUI. You have to press a third key in order for the key sequence to register. This is mostly ncurses' fault. Calling wgetch() normally causes ncurses to read only a single key from stdin. However if the key read is the start-sequence key (^[ a.k.a. ESC) then wgetch() reads TWO keys from stdin, storing the 2nd key into an internal FIFO buffer and returning the start-sequence key. The extraneous read of the 2nd key makes us miss its corresponding stdin event, so the event loop blocks until a third key is pressed. This explains why such key sequences do not behave promptly in TUI. To fix this issue, we must somehow compensate for the missed stdin event corresponding to the 2nd byte of a key sequence. This patch achieves this by hacking up the stdin event handler to conditionally execute the readline callback multiple times in a row. This is done via a new global variable, call_stdin_event_handler_again_p, which is set from tui_getc() when we receive a start-sequence key and notice extra pending input in the ncurses buffer. Tested on x86_64-unknown-linux-gnu. gdb/ChangeLog: * event-top.h (call_stdin_event_handler_again_p): Declare. * event-top.c (call_stdin_event_handler_again_p): Define. (stdin_event_handler): Use it. * tui/tui-io.c (tui_getc): Prepare to call the stdin event handler again if there is pending input following a start sequence.
740 lines
20 KiB
C
740 lines
20 KiB
C
/* TUI support I/O functions.
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Copyright (C) 1998-2014 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 "filestuff.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 rl_getc_func_t *tui_old_rl_getc_function;
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static rl_voidfunc_t *tui_old_rl_redisplay_function;
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static rl_vintfunc_t *tui_old_rl_prep_terminal;
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static rl_voidfunc_t *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 = rl_prompt != NULL ? xstrdup (rl_prompt) : NULL;
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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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xsnprintf (msg, sizeof (msg),
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"\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');
|
|
}
|
|
}
|
|
|
|
/* Setup the IO for curses or non-curses mode.
|
|
- In non-curses mode, readline and gdb use the standard input and
|
|
standard output/error directly.
|
|
- In curses mode, the standard output/error is controlled by TUI
|
|
with the tui_stdout and tui_stderr. The output is redirected in
|
|
the curses command window. Several readline callbacks are installed
|
|
so that readline asks for its input to the curses command window
|
|
with wgetch(). */
|
|
void
|
|
tui_setup_io (int mode)
|
|
{
|
|
extern int _rl_echoing_p;
|
|
|
|
if (mode)
|
|
{
|
|
/* Redirect readline to TUI. */
|
|
tui_old_rl_redisplay_function = rl_redisplay_function;
|
|
tui_old_rl_deprep_terminal = rl_deprep_term_function;
|
|
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. */
|
|
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 (gdb_pipe_cloexec (tui_readline_pipe) != 0)
|
|
error (_("Cannot create pipe for readline"));
|
|
|
|
tui_rl_outstream = fdopen (tui_readline_pipe[1], "w");
|
|
if (tui_rl_outstream == 0)
|
|
error (_("Cannot redirect readline output"));
|
|
|
|
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';
|
|
|
|
if (async_command_editing_p && key_is_start_sequence (ch))
|
|
{
|
|
int ch_pending;
|
|
|
|
nodelay (w, TRUE);
|
|
ch_pending = wgetch (w);
|
|
nodelay (w, FALSE);
|
|
|
|
/* If we have pending input following a start sequence, call the stdin
|
|
event handler again because ncurses may have already read and stored
|
|
the input into its internal buffer, meaning that we won't get an stdin
|
|
event for it. If we don't compensate for this missed stdin event, key
|
|
sequences as Alt_F (^[f) will not behave promptly.
|
|
|
|
(We only compensates for the missed 2nd byte of a key sequence because
|
|
2-byte sequences are by far the most commonly used. ncurses may have
|
|
buffered a larger, 3+-byte key sequence though it remains to be seen
|
|
whether it is useful to compensate for all the bytes of such
|
|
sequences.) */
|
|
if (ch_pending != ERR)
|
|
{
|
|
ungetch (ch_pending);
|
|
call_stdin_event_handler_again_p = 1;
|
|
}
|
|
}
|
|
|
|
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;
|
|
}
|