807 lines
21 KiB
C
807 lines
21 KiB
C
/* display.c -- readline redisplay facility. */
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/* Copyright (C) 1987, 1989, 1992 Free Software Foundation, Inc.
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This file is part of the GNU Readline Library, a library for
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reading lines of text with interactive input and history editing.
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The GNU Readline Library is free software; you can redistribute it
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and/or modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 1, or
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(at your option) any later version.
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The GNU Readline Library is distributed in the hope that it will be
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useful, but WITHOUT ANY WARRANTY; without even the implied warranty
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of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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The GNU General Public License is often shipped with GNU software, and
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is generally kept in a file called COPYING or LICENSE. If you do not
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have a copy of the license, write to the Free Software Foundation,
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675 Mass Ave, Cambridge, MA 02139, USA. */
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#include <stdio.h>
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#include <sys/types.h>
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/* System-specific feature definitions and include files. */
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#include "rldefs.h"
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/* Some standard library routines. */
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#include "readline.h"
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#include "history.h"
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#if !defined (strrchr)
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extern char *strrchr ();
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#endif /* !strchr */
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/* Global and pseudo-global variables and functions
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imported from readline.c. */
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extern char *rl_prompt;
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extern int readline_echoing_p;
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extern char *term_clreol, *term_im, *term_ic, *term_ei, *term_DC;
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/* Termcap variables. */
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extern char *term_up, *term_dc, *term_cr, *term_IC;
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extern int screenheight, screenwidth, terminal_can_insert, term_xn;
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extern void _rl_output_some_chars ();
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extern int _rl_output_character_function ();
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extern int _rl_convert_meta_chars_to_ascii;
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extern int _rl_horizontal_scroll_mode;
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extern int _rl_mark_modified_lines;
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extern int _rl_prefer_visible_bell;
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/* Pseudo-global functions (local to the readline library) exported
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by this file. */
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void _rl_move_cursor_relative (), _rl_output_some_chars ();
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void _rl_move_vert ();
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static void update_line (), clear_to_eol ();
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static void delete_chars (), insert_some_chars ();
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extern char *xmalloc (), *xrealloc ();
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/* **************************************************************** */
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/* */
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/* Display stuff */
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/* */
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/* **************************************************************** */
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/* This is the stuff that is hard for me. I never seem to write good
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display routines in C. Let's see how I do this time. */
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/* (PWP) Well... Good for a simple line updater, but totally ignores
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the problems of input lines longer than the screen width.
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update_line and the code that calls it makes a multiple line,
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automatically wrapping line update. Carefull attention needs
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to be paid to the vertical position variables. */
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/* Keep two buffers; one which reflects the current contents of the
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screen, and the other to draw what we think the new contents should
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be. Then compare the buffers, and make whatever changes to the
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screen itself that we should. Finally, make the buffer that we
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just drew into be the one which reflects the current contents of the
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screen, and place the cursor where it belongs.
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Commands that want to can fix the display themselves, and then let
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this function know that the display has been fixed by setting the
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RL_DISPLAY_FIXED variable. This is good for efficiency. */
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/* What YOU turn on when you have handled all redisplay yourself. */
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int rl_display_fixed = 0;
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/* The stuff that gets printed out before the actual text of the line.
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This is usually pointing to rl_prompt. */
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char *rl_display_prompt = (char *)NULL;
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/* Pseudo-global variables declared here. */
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/* The visible cursor position. If you print some text, adjust this. */
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int _rl_last_c_pos = 0;
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int _rl_last_v_pos = 0;
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/* Number of lines currently on screen minus 1. */
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int _rl_vis_botlin = 0;
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/* Variables used only in this file. */
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/* The last left edge of text that was displayed. This is used when
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doing horizontal scrolling. It shifts in thirds of a screenwidth. */
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static int last_lmargin = 0;
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/* The line display buffers. One is the line currently displayed on
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the screen. The other is the line about to be displayed. */
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static char *visible_line = (char *)NULL;
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static char *invisible_line = (char *)NULL;
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/* A buffer for `modeline' messages. */
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static char msg_buf[128];
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/* Non-zero forces the redisplay even if we thought it was unnecessary. */
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static int forced_display = 0;
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/* Default and initial buffer size. Can grow. */
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static int line_size = 1024;
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/* Basic redisplay algorithm. */
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rl_redisplay ()
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{
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register int in, out, c, linenum;
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register char *line = invisible_line;
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char *prompt_this_line;
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int c_pos = 0;
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int inv_botlin = 0; /* Number of lines in newly drawn buffer. */
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if (!readline_echoing_p)
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return;
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if (!rl_display_prompt)
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rl_display_prompt = "";
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if (!invisible_line)
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{
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visible_line = (char *)xmalloc (line_size);
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invisible_line = (char *)xmalloc (line_size);
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line = invisible_line;
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for (in = 0; in < line_size; in++)
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{
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visible_line[in] = 0;
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invisible_line[in] = 1;
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}
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rl_on_new_line ();
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}
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/* Draw the line into the buffer. */
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c_pos = -1;
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/* Mark the line as modified or not. We only do this for history
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lines. */
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out = 0;
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if (_rl_mark_modified_lines && current_history () && rl_undo_list)
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{
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line[out++] = '*';
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line[out] = '\0';
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}
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/* If someone thought that the redisplay was handled, but the currently
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visible line has a different modification state than the one about
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to become visible, then correct the caller's misconception. */
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if (visible_line[0] != invisible_line[0])
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rl_display_fixed = 0;
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prompt_this_line = strrchr (rl_display_prompt, '\n');
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if (!prompt_this_line)
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prompt_this_line = rl_display_prompt;
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else
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{
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prompt_this_line++;
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if (forced_display)
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_rl_output_some_chars
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(rl_display_prompt, prompt_this_line - rl_display_prompt);
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}
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strncpy (line + out, prompt_this_line, strlen (prompt_this_line));
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out += strlen (prompt_this_line);
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line[out] = '\0';
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for (in = 0; in < rl_end; in++)
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{
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c = (unsigned char)rl_line_buffer[in];
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if (out + 8 >= line_size) /* XXX - 8 for \t */
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{
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line_size *= 2;
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visible_line = (char *)xrealloc (visible_line, line_size);
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invisible_line = (char *)xrealloc (invisible_line, line_size);
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line = invisible_line;
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}
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if (in == rl_point)
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c_pos = out;
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if (META_CHAR (c))
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{
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if (_rl_convert_meta_chars_to_ascii)
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{
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sprintf (line + out, "\\%o", c);
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out += 4;
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}
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else
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line[out++] = c;
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}
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#define DISPLAY_TABS
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#if defined (DISPLAY_TABS)
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else if (c == '\t')
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{
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register int newout = (out | (int)7) + 1;
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while (out < newout)
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line[out++] = ' ';
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}
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#endif
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else if (c < ' ')
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{
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line[out++] = '^';
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line[out++] = UNCTRL (c); /* XXX was c ^ 0x40 */
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}
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else if (c == 127)
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{
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line[out++] = '^';
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line[out++] = '?';
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}
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else
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line[out++] = c;
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}
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line[out] = '\0';
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if (c_pos < 0)
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c_pos = out;
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/* PWP: now is when things get a bit hairy. The visible and invisible
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line buffers are really multiple lines, which would wrap every
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screenwidth characters. Go through each in turn, finding
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the changed region and updating it. The line order is top to bottom. */
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/* If we can move the cursor up and down, then use multiple lines,
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otherwise, let long lines display in a single terminal line, and
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horizontally scroll it. */
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if (!_rl_horizontal_scroll_mode && term_up && *term_up)
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{
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int total_screen_chars = (screenwidth * screenheight);
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if (!rl_display_fixed || forced_display)
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{
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forced_display = 0;
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/* If we have more than a screenful of material to display, then
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only display a screenful. We should display the last screen,
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not the first. I'll fix this in a minute. */
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if (out >= total_screen_chars)
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out = total_screen_chars - 1;
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/* Number of screen lines to display. */
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inv_botlin = out / screenwidth;
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/* For each line in the buffer, do the updating display. */
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for (linenum = 0; linenum <= inv_botlin; linenum++)
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update_line (linenum > _rl_vis_botlin ? ""
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: &visible_line[linenum * screenwidth],
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&invisible_line[linenum * screenwidth],
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linenum);
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/* We may have deleted some lines. If so, clear the left over
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blank ones at the bottom out. */
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if (_rl_vis_botlin > inv_botlin)
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{
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char *tt;
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for (; linenum <= _rl_vis_botlin; linenum++)
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{
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tt = &visible_line[linenum * screenwidth];
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_rl_move_vert (linenum);
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_rl_move_cursor_relative (0, tt);
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clear_to_eol
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((linenum == _rl_vis_botlin) ? strlen (tt) : screenwidth);
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}
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}
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_rl_vis_botlin = inv_botlin;
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/* Move the cursor where it should be. */
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_rl_move_vert (c_pos / screenwidth);
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_rl_move_cursor_relative (c_pos % screenwidth,
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&invisible_line[(c_pos / screenwidth) * screenwidth]);
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}
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}
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else /* Do horizontal scrolling. */
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{
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int lmargin;
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/* Always at top line. */
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_rl_last_v_pos = 0;
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/* If the display position of the cursor would be off the edge
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of the screen, start the display of this line at an offset that
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leaves the cursor on the screen. */
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if (c_pos - last_lmargin > screenwidth - 2)
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lmargin = (c_pos / (screenwidth / 3) - 2) * (screenwidth / 3);
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else if (c_pos - last_lmargin < 1)
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lmargin = ((c_pos - 1) / (screenwidth / 3)) * (screenwidth / 3);
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else
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lmargin = last_lmargin;
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/* If the first character on the screen isn't the first character
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in the display line, indicate this with a special character. */
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if (lmargin > 0)
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line[lmargin] = '<';
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if (lmargin + screenwidth < out)
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line[lmargin + screenwidth - 1] = '>';
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if (!rl_display_fixed || forced_display || lmargin != last_lmargin)
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{
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forced_display = 0;
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update_line (&visible_line[last_lmargin],
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&invisible_line[lmargin], 0);
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_rl_move_cursor_relative (c_pos - lmargin, &invisible_line[lmargin]);
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last_lmargin = lmargin;
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}
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}
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fflush (rl_outstream);
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/* Swap visible and non-visible lines. */
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{
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char *temp = visible_line;
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visible_line = invisible_line;
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invisible_line = temp;
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rl_display_fixed = 0;
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}
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}
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/* PWP: update_line() is based on finding the middle difference of each
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line on the screen; vis:
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/old first difference
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/beginning of line | /old last same /old EOL
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v v v v
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old: eddie> Oh, my little gruntle-buggy is to me, as lurgid as
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new: eddie> Oh, my little buggy says to me, as lurgid as
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^ ^ ^ ^
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\beginning of line | \new last same \new end of line
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\new first difference
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All are character pointers for the sake of speed. Special cases for
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no differences, as well as for end of line additions must be handeled.
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Could be made even smarter, but this works well enough */
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static void
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update_line (old, new, current_line)
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register char *old, *new;
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int current_line;
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{
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register char *ofd, *ols, *oe, *nfd, *nls, *ne;
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int lendiff, wsatend;
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if (_rl_last_c_pos == screenwidth && term_xn && new[0])
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{
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putc (new[0], rl_outstream);
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_rl_last_c_pos = 1;
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_rl_last_v_pos++;
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if (old[0])
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old[0] = new[0];
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}
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/* Find first difference. */
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for (ofd = old, nfd = new;
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(ofd - old < screenwidth) && *ofd && (*ofd == *nfd);
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ofd++, nfd++)
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;
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/* Move to the end of the screen line. */
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for (oe = ofd; ((oe - old) < screenwidth) && *oe; oe++);
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for (ne = nfd; ((ne - new) < screenwidth) && *ne; ne++);
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/* If no difference, continue to next line. */
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if (ofd == oe && nfd == ne)
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return;
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wsatend = 1; /* flag for trailing whitespace */
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ols = oe - 1; /* find last same */
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nls = ne - 1;
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while ((ols > ofd) && (nls > nfd) && (*ols == *nls))
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{
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if (*ols != ' ')
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wsatend = 0;
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ols--;
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nls--;
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}
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if (wsatend)
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{
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ols = oe;
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nls = ne;
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}
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else if (*ols != *nls)
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{
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if (*ols) /* don't step past the NUL */
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ols++;
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if (*nls)
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nls++;
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}
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_rl_move_vert (current_line);
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_rl_move_cursor_relative (ofd - old, old);
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/* if (len (new) > len (old)) */
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lendiff = (nls - nfd) - (ols - ofd);
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/* Insert (diff (len (old), len (new)) ch. */
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if (lendiff > 0)
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{
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if (terminal_can_insert)
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{
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/* Sometimes it is cheaper to print the characters rather than
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use the terminal's capabilities. */
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if ((2 * (ne - nfd)) < lendiff && !term_IC)
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{
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_rl_output_some_chars (nfd, (ne - nfd));
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_rl_last_c_pos += (ne - nfd);
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}
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else
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{
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if (*ols)
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{
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insert_some_chars (nfd, lendiff);
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_rl_last_c_pos += lendiff;
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}
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else
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{
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/* At the end of a line the characters do not have to
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be "inserted". They can just be placed on the screen. */
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_rl_output_some_chars (nfd, lendiff);
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_rl_last_c_pos += lendiff;
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}
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/* Copy (new) chars to screen from first diff to last match. */
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if (((nls - nfd) - lendiff) > 0)
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{
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_rl_output_some_chars (&nfd[lendiff], ((nls - nfd) - lendiff));
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_rl_last_c_pos += ((nls - nfd) - lendiff);
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}
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}
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}
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else
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{ /* cannot insert chars, write to EOL */
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_rl_output_some_chars (nfd, (ne - nfd));
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_rl_last_c_pos += (ne - nfd);
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}
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}
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else /* Delete characters from line. */
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{
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/* If possible and inexpensive to use terminal deletion, then do so. */
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if (term_dc && (2 * (ne - nfd)) >= (-lendiff))
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{
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if (lendiff)
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delete_chars (-lendiff); /* delete (diff) characters */
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/* Copy (new) chars to screen from first diff to last match */
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if ((nls - nfd) > 0)
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{
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_rl_output_some_chars (nfd, (nls - nfd));
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_rl_last_c_pos += (nls - nfd);
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}
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}
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/* Otherwise, print over the existing material. */
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else
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{
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_rl_output_some_chars (nfd, (ne - nfd));
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_rl_last_c_pos += (ne - nfd);
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clear_to_eol ((oe - old) - (ne - new));
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}
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}
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}
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/* Tell the update routines that we have moved onto a new (empty) line. */
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rl_on_new_line ()
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{
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if (visible_line)
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visible_line[0] = '\0';
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_rl_last_c_pos = _rl_last_v_pos = 0;
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_rl_vis_botlin = last_lmargin = 0;
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}
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/* Actually update the display, period. */
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rl_forced_update_display ()
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{
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if (visible_line)
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{
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register char *temp = visible_line;
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while (*temp) *temp++ = '\0';
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}
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rl_on_new_line ();
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forced_display++;
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rl_redisplay ();
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}
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/* Move the cursor from _rl_last_c_pos to NEW, which are buffer indices.
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DATA is the contents of the screen line of interest; i.e., where
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the movement is being done. */
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void
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_rl_move_cursor_relative (new, data)
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int new;
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char *data;
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{
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register int i;
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/* It may be faster to output a CR, and then move forwards instead
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of moving backwards. */
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if (new + 1 < _rl_last_c_pos - new)
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{
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#ifdef __MSDOS__
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putc('\r', rl_outstream);
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#else
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tputs (term_cr, 1, _rl_output_character_function);
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#endif
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_rl_last_c_pos = 0;
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}
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|
if (_rl_last_c_pos == new) return;
|
|
|
|
if (_rl_last_c_pos < new)
|
|
{
|
|
/* Move the cursor forward. We do it by printing the command
|
|
to move the cursor forward if there is one, else print that
|
|
portion of the output buffer again. Which is cheaper? */
|
|
|
|
/* The above comment is left here for posterity. It is faster
|
|
to print one character (non-control) than to print a control
|
|
sequence telling the terminal to move forward one character.
|
|
That kind of control is for people who don't know what the
|
|
data is underneath the cursor. */
|
|
#if defined (HACK_TERMCAP_MOTION)
|
|
extern char *term_forward_char;
|
|
|
|
if (term_forward_char)
|
|
for (i = _rl_last_c_pos; i < new; i++)
|
|
tputs (term_forward_char, 1, _rl_output_character_function);
|
|
else
|
|
for (i = _rl_last_c_pos; i < new; i++)
|
|
putc (data[i], rl_outstream);
|
|
#else
|
|
for (i = _rl_last_c_pos; i < new; i++)
|
|
putc (data[i], rl_outstream);
|
|
#endif /* HACK_TERMCAP_MOTION */
|
|
}
|
|
else
|
|
backspace (_rl_last_c_pos - new);
|
|
_rl_last_c_pos = new;
|
|
}
|
|
|
|
/* PWP: move the cursor up or down. */
|
|
void
|
|
_rl_move_vert (to)
|
|
int to;
|
|
{
|
|
register int delta, i;
|
|
|
|
if (_rl_last_v_pos == to || to > screenheight)
|
|
return;
|
|
|
|
#ifdef __GO32__
|
|
{
|
|
int row, col;
|
|
ScreenGetCursor (&row, &col);
|
|
ScreenSetCursor ((row + to - _rl_last_v_pos), col);
|
|
}
|
|
#else /* __GO32__ */
|
|
if ((delta = to - _rl_last_v_pos) > 0)
|
|
{
|
|
for (i = 0; i < delta; i++)
|
|
putc ('\n', rl_outstream);
|
|
tputs (term_cr, 1, _rl_output_character_function);
|
|
_rl_last_c_pos = 0;
|
|
}
|
|
else
|
|
{ /* delta < 0 */
|
|
if (term_up && *term_up)
|
|
for (i = 0; i < -delta; i++)
|
|
tputs (term_up, 1, _rl_output_character_function);
|
|
}
|
|
#endif /* !__GO32__ */
|
|
_rl_last_v_pos = to; /* Now TO is here */
|
|
}
|
|
|
|
/* Physically print C on rl_outstream. This is for functions which know
|
|
how to optimize the display. */
|
|
rl_show_char (c)
|
|
int c;
|
|
{
|
|
if (META_CHAR (c) && _rl_convert_meta_chars_to_ascii)
|
|
{
|
|
fprintf (rl_outstream, "M-");
|
|
c = UNMETA (c);
|
|
}
|
|
|
|
#if defined (DISPLAY_TABS)
|
|
if (c < 32 && c != '\t')
|
|
#else
|
|
if (c < 32)
|
|
#endif /* !DISPLAY_TABS */
|
|
{
|
|
|
|
c += 64;
|
|
}
|
|
|
|
putc (c, rl_outstream);
|
|
fflush (rl_outstream);
|
|
}
|
|
|
|
int
|
|
rl_character_len (c, pos)
|
|
register int c, pos;
|
|
{
|
|
if (META_CHAR (c))
|
|
return (_rl_convert_meta_chars_to_ascii ? 4 : 1);
|
|
|
|
if (c == '\t')
|
|
{
|
|
#if defined (DISPLAY_TABS)
|
|
return (((pos | (int)7) + 1) - pos);
|
|
#else
|
|
return (2);
|
|
#endif /* !DISPLAY_TABS */
|
|
}
|
|
|
|
if (isprint (c))
|
|
return (1);
|
|
else
|
|
return (2);
|
|
}
|
|
|
|
/* How to print things in the "echo-area". The prompt is treated as a
|
|
mini-modeline. */
|
|
|
|
#if defined (HAVE_VARARGS_H)
|
|
rl_message (va_alist)
|
|
va_dcl
|
|
{
|
|
char *format;
|
|
va_list args;
|
|
|
|
va_start (args);
|
|
format = va_arg (args, char *);
|
|
vsprintf (msg_buf, format, args);
|
|
va_end (args);
|
|
|
|
rl_display_prompt = msg_buf;
|
|
rl_redisplay ();
|
|
}
|
|
#else /* !HAVE_VARARGS_H */
|
|
rl_message (format, arg1, arg2)
|
|
char *format;
|
|
{
|
|
sprintf (msg_buf, format, arg1, arg2);
|
|
rl_display_prompt = msg_buf;
|
|
rl_redisplay ();
|
|
}
|
|
#endif /* !HAVE_VARARGS_H */
|
|
|
|
/* How to clear things from the "echo-area". */
|
|
rl_clear_message ()
|
|
{
|
|
rl_display_prompt = rl_prompt;
|
|
rl_redisplay ();
|
|
}
|
|
|
|
rl_reset_line_state ()
|
|
{
|
|
rl_on_new_line ();
|
|
|
|
rl_display_prompt = rl_prompt ? rl_prompt : "";
|
|
forced_display = 1;
|
|
}
|
|
|
|
/* Quick redisplay hack when erasing characters at the end of the line. */
|
|
void
|
|
_rl_erase_at_end_of_line (l)
|
|
int l;
|
|
{
|
|
register int i;
|
|
|
|
backspace (l);
|
|
for (i = 0; i < l; i++)
|
|
putc (' ', rl_outstream);
|
|
backspace (l);
|
|
for (i = 0; i < l; i++)
|
|
visible_line[--_rl_last_c_pos] = '\0';
|
|
rl_display_fixed++;
|
|
}
|
|
|
|
/* Clear to the end of the line. COUNT is the minimum
|
|
number of character spaces to clear, */
|
|
static void
|
|
clear_to_eol (count)
|
|
int count;
|
|
{
|
|
#ifndef __GO32__
|
|
if (term_clreol)
|
|
{
|
|
tputs (term_clreol, 1, _rl_output_character_function);
|
|
}
|
|
else
|
|
#endif /* !__GO32__ */
|
|
{
|
|
register int i;
|
|
|
|
/* Do one more character space. */
|
|
count++;
|
|
|
|
for (i = 0; i < count; i++)
|
|
putc (' ', rl_outstream);
|
|
|
|
backspace (count);
|
|
}
|
|
}
|
|
/* Insert COUNT characters from STRING to the output stream. */
|
|
static void
|
|
insert_some_chars (string, count)
|
|
char *string;
|
|
int count;
|
|
{
|
|
#ifdef __GO32__
|
|
int row, col, width;
|
|
char *row_start;
|
|
|
|
ScreenGetCursor (&row, &col);
|
|
width = ScreenCols ();
|
|
row_start = ScreenPrimary + (row * width);
|
|
memcpy (row_start + col + count, row_start + col, width - col - count);
|
|
/* Place the text on the screen. */
|
|
_rl_output_some_chars (string, count);
|
|
#else /* __GO32__ */
|
|
/* If IC is defined, then we do not have to "enter" insert mode. */
|
|
if (term_IC)
|
|
{
|
|
char *tgoto (), *buffer;
|
|
buffer = tgoto (term_IC, 0, count);
|
|
tputs (buffer, 1, _rl_output_character_function);
|
|
_rl_output_some_chars (string, count);
|
|
}
|
|
else
|
|
{
|
|
register int i;
|
|
|
|
/* If we have to turn on insert-mode, then do so. */
|
|
if (term_im && *term_im)
|
|
tputs (term_im, 1, _rl_output_character_function);
|
|
|
|
/* If there is a special command for inserting characters, then
|
|
use that first to open up the space. */
|
|
if (term_ic && *term_ic)
|
|
{
|
|
for (i = count; i--; )
|
|
tputs (term_ic, 1, _rl_output_character_function);
|
|
}
|
|
|
|
/* Print the text. */
|
|
_rl_output_some_chars (string, count);
|
|
|
|
/* If there is a string to turn off insert mode, we had best use
|
|
it now. */
|
|
if (term_ei && *term_ei)
|
|
tputs (term_ei, 1, _rl_output_character_function);
|
|
}
|
|
#endif /* __GO32__ */
|
|
}
|
|
|
|
/* Delete COUNT characters from the display line. */
|
|
static void
|
|
delete_chars (count)
|
|
int count;
|
|
{
|
|
#if defined (__GO32__)
|
|
int row, col, width;
|
|
char *row_start;
|
|
|
|
ScreenGetCursor (&row, &col);
|
|
width = ScreenCols ();
|
|
row_start = ScreenPrimary + (row * width);
|
|
memcpy (row_start + col, row_start + col + count, width - col - count);
|
|
memset (row_start + width - count, 0, count * 2);
|
|
#else /* !__GO32__ */
|
|
if (count > screenwidth)
|
|
return;
|
|
|
|
if (term_DC && *term_DC)
|
|
{
|
|
char *tgoto (), *buffer;
|
|
buffer = tgoto (term_DC, 0, count);
|
|
tputs (buffer, 1, _rl_output_character_function);
|
|
}
|
|
else
|
|
{
|
|
if (term_dc && *term_dc)
|
|
while (count--)
|
|
tputs (term_dc, 1, _rl_output_character_function);
|
|
}
|
|
#endif /* !__GO32__ */
|
|
}
|