1018 lines
27 KiB
C
1018 lines
27 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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#if defined (HAVE_UNISTD_H)
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# include <unistd.h>
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#endif /* HAVE_UNISTD_H */
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#if defined (HAVE_STDLIB_H)
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# include <stdlib.h>
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#else
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# include "ansi_stdlib.h"
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#endif /* HAVE_STDLIB_H */
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#include "posixstat.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/readline.h>
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#include <readline/history.h>
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#if !defined (strchr) && !defined (__STDC__)
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extern char *strchr (), *strrchr ();
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#endif /* !strchr && !__STDC__ */
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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, screenchars;
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extern int terminal_can_insert;
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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_output_meta_chars;
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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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handling of terminals with autowrap on (incl. DEC braindamage)
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could be improved a bit. Right now I just cheat and decrement
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screenwidth by one. */
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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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/* Global variables declared here. */
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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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static char *last_prompt_string = (char *)NULL;
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static char *local_prompt, *local_prompt_prefix;
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static int visible_length, prefix_length;
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/* The number of invisible characters in the line currently being
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displayed on the screen. */
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static int visible_wrap_offset = 0;
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/* The length (buffer offset) of the first line of the last (possibly
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multi-line) buffer displayed on the screen. */
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static int visible_first_line_len = 0;
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/* Expand the prompt string S and return the number of visible
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characters in *LP, if LP is not null. This is currently more-or-less
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a placeholder for expansion. */
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/* Current implementation:
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\001 (^A) start non-visible characters
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\002 (^B) end non-visible characters
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all characters except \001 and \002 (following a \001) are copied to
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the returned string; all characters except those between \001 and
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\002 are assumed to be `visible'. */
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static char *
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expand_prompt (pmt, lp)
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char *pmt;
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int *lp;
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{
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char *r, *ret, *p;
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int l, rl, ignoring;
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/* Short-circuit if we can. */
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if (strchr (pmt, RL_PROMPT_START_IGNORE) == 0)
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{
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r = savestring (pmt);
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if (lp)
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*lp = strlen (r);
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return r;
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}
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l = strlen (pmt);
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r = ret = xmalloc (l + 1);
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for (rl = ignoring = 0, p = pmt; p && *p; p++)
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{
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/* This code strips the invisible character string markers
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RL_PROMPT_START_IGNORE and RL_PROMPT_END_IGNORE */
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if (*p == RL_PROMPT_START_IGNORE)
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{
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ignoring++;
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continue;
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}
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else if (ignoring && *p == RL_PROMPT_END_IGNORE)
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{
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ignoring = 0;
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continue;
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}
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else
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{
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*r++ = *p;
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if (!ignoring)
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rl++;
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}
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}
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*r = '\0';
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if (lp)
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*lp = rl;
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return ret;
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}
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/*
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* Expand the prompt string into the various display components, if
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* necessary.
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*
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* local_prompt = expanded last line of string in rl_display_prompt
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* (portion after the final newline)
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* local_prompt_prefix = portion before last newline of rl_display_prompt,
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* expanded via expand_prompt
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* visible_length = number of visible characters in local_prompt
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* prefix_length = number of visible characters in local_prompt_prefix
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*
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* This function is called once per call to readline(). It may also be
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* called arbitrarily to expand the primary prompt.
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*
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* The return value is the number of visible characters on the last line
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* of the (possibly multi-line) prompt.
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*/
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int
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rl_expand_prompt (prompt)
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char *prompt;
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{
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char *p, *t;
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int c;
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/* Clear out any saved values. */
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if (local_prompt)
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free (local_prompt);
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if (local_prompt_prefix)
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free (local_prompt_prefix);
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local_prompt = local_prompt_prefix = (char *)0;
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p = strrchr (prompt, '\n');
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if (!p)
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{
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/* The prompt is only one line. */
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local_prompt = expand_prompt (prompt, &visible_length);
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local_prompt_prefix = (char *)0;
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return (visible_length);
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}
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else
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{
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/* The prompt spans multiple lines. */
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t = ++p;
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local_prompt = expand_prompt (p, &visible_length);
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c = *t; *t = '\0';
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/* The portion of the prompt string up to and including the
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final newline is now null-terminated. */
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local_prompt_prefix = expand_prompt (prompt, &prefix_length);
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*t = c;
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return (prefix_length);
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}
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}
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/* Basic redisplay algorithm. */
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void
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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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int c_pos = 0, inv_botlin = 0, wrap_offset, wrap_column;
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char *prompt_this_line;
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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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/* If the prompt to be displayed is the `primary' readline prompt (the
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one passed to readline()), use the values we have already expanded.
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If not, use what's already in rl_display_prompt. WRAP_OFFSET is the
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number of non-visible characters in the prompt string. */
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if (rl_display_prompt == rl_prompt)
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{
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int local_len = strlen (local_prompt);
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if (local_prompt_prefix && forced_display)
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_rl_output_some_chars (local_prompt_prefix, strlen (local_prompt_prefix));
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if (local_prompt)
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strncpy (line + out, local_prompt, local_len);
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out += local_len;
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line[out] = '\0';
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wrap_offset = local_len - visible_length;
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}
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else
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{
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int pmtlen;
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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 (rl_display_prompt, prompt_this_line - rl_display_prompt);
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}
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pmtlen = strlen (prompt_this_line);
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strncpy (line + out, prompt_this_line, pmtlen);
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out += pmtlen;
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line[out] = '\0';
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wrap_offset = 0;
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}
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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_output_meta_chars == 0)
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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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#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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/* C_POS == position in buffer where cursor should be placed. */
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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 - 1) 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 = screenchars;
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int nleft, cursor_linenum, pos;
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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. The first line wraps at
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(screenwidth + wrap_offset) chars, the rest of the lines have
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screenwidth chars. */
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nleft = out - screenwidth - wrap_offset;
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if (nleft > 0)
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inv_botlin = 1 + nleft / screenwidth;
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else
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inv_botlin = 0;
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/* The first line is at character position 0 in the buffer. The
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second and subsequent lines start at N * screenwidth, offset by
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OFFSET. OFFSET is wrap_offset for the invisible line and
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visible_wrap_offset for the line currently displayed. */
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#define L_OFFSET(n, offset) ((n) > 0 ? ((n) * screenwidth) + (offset) : 0)
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#define VIS_CHARS(line) &visible_line[L_OFFSET((line), visible_wrap_offset)]
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#define VIS_LINE(line) ((line) > _rl_vis_botlin) ? "" : VIS_CHARS(line)
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#define INV_LINE(line) &invisible_line[L_OFFSET((line), wrap_offset)]
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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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{
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update_line (VIS_LINE(linenum), INV_LINE(linenum), linenum);
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/* If this is the line with the prompt, we might need to
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compensate for invisible characters in the new line. Do
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this only if there is not more than one new line (which
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implies that we completely overwrite the old visible line)
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and the new line is shorter than the old. */
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if (linenum == 0 &&
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inv_botlin == 0 &&
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(wrap_offset > visible_wrap_offset) &&
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(_rl_last_c_pos < visible_first_line_len))
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{
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nleft = screenwidth + wrap_offset - _rl_last_c_pos;
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clear_to_eol (nleft);
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}
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/* Since the new first line is now visible, save its length. */
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if (linenum == 0)
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visible_first_line_len = _rl_last_c_pos;
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}
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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 = VIS_CHARS (linenum);
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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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/* Which line? */
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nleft = c_pos - screenwidth - wrap_offset;
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if (nleft > 0)
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cursor_linenum = 1 + nleft / screenwidth;
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else
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cursor_linenum = 0;
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_rl_move_vert (cursor_linenum);
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/* Where on that line? And where does that line start
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in the buffer? */
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pos = L_OFFSET(cursor_linenum, wrap_offset);
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nleft = c_pos - pos;
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_rl_move_cursor_relative (nleft, &invisible_line[pos]);
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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)
|
|
line[lmargin] = '<';
|
|
|
|
if (lmargin + screenwidth < out)
|
|
line[lmargin + screenwidth - 1] = '>';
|
|
|
|
if (!rl_display_fixed || forced_display || lmargin != last_lmargin)
|
|
{
|
|
forced_display = 0;
|
|
update_line (&visible_line[last_lmargin],
|
|
&invisible_line[lmargin], 0);
|
|
|
|
_rl_move_cursor_relative (c_pos - lmargin, &invisible_line[lmargin]);
|
|
last_lmargin = lmargin;
|
|
}
|
|
}
|
|
fflush (rl_outstream);
|
|
|
|
/* Swap visible and non-visible lines. */
|
|
{
|
|
char *temp = visible_line;
|
|
visible_line = invisible_line;
|
|
invisible_line = temp;
|
|
rl_display_fixed = 0;
|
|
visible_wrap_offset = wrap_offset;
|
|
}
|
|
}
|
|
|
|
/* PWP: update_line() is based on finding the middle difference of each
|
|
line on the screen; vis:
|
|
|
|
/old first difference
|
|
/beginning of line | /old last same /old EOL
|
|
v v v v
|
|
old: eddie> Oh, my little gruntle-buggy is to me, as lurgid as
|
|
new: eddie> Oh, my little buggy says to me, as lurgid as
|
|
^ ^ ^ ^
|
|
\beginning of line | \new last same \new end of line
|
|
\new first difference
|
|
|
|
All are character pointers for the sake of speed. Special cases for
|
|
no differences, as well as for end of line additions must be handeled.
|
|
|
|
Could be made even smarter, but this works well enough */
|
|
static void
|
|
update_line (old, new, current_line)
|
|
register char *old, *new;
|
|
int current_line;
|
|
{
|
|
register char *ofd, *ols, *oe, *nfd, *nls, *ne;
|
|
int lendiff, wsatend;
|
|
|
|
/* Find first difference. */
|
|
for (ofd = old, nfd = new;
|
|
(ofd - old < screenwidth) && *ofd && (*ofd == *nfd);
|
|
ofd++, nfd++)
|
|
;
|
|
|
|
/* Move to the end of the screen line. */
|
|
for (oe = ofd; ((oe - old) < screenwidth) && *oe; oe++);
|
|
for (ne = nfd; ((ne - new) < screenwidth) && *ne; ne++);
|
|
|
|
/* If no difference, continue to next line. */
|
|
if (ofd == oe && nfd == ne)
|
|
return;
|
|
|
|
wsatend = 1; /* flag for trailing whitespace */
|
|
ols = oe - 1; /* find last same */
|
|
nls = ne - 1;
|
|
while ((ols > ofd) && (nls > nfd) && (*ols == *nls))
|
|
{
|
|
if (*ols != ' ')
|
|
wsatend = 0;
|
|
ols--;
|
|
nls--;
|
|
}
|
|
|
|
if (wsatend)
|
|
{
|
|
ols = oe;
|
|
nls = ne;
|
|
}
|
|
else if (*ols != *nls)
|
|
{
|
|
if (*ols) /* don't step past the NUL */
|
|
ols++;
|
|
if (*nls)
|
|
nls++;
|
|
}
|
|
|
|
_rl_move_vert (current_line);
|
|
_rl_move_cursor_relative (ofd - old, old);
|
|
|
|
/* if (len (new) > len (old)) */
|
|
lendiff = (nls - nfd) - (ols - ofd);
|
|
|
|
/* Insert (diff (len (old), len (new)) ch. */
|
|
if (lendiff > 0)
|
|
{
|
|
if (terminal_can_insert)
|
|
{
|
|
/* Sometimes it is cheaper to print the characters rather than
|
|
use the terminal's capabilities. */
|
|
if ((2 * (ne - nfd)) < lendiff && !term_IC)
|
|
{
|
|
_rl_output_some_chars (nfd, (ne - nfd));
|
|
_rl_last_c_pos += (ne - nfd);
|
|
}
|
|
else
|
|
{
|
|
if (*ols)
|
|
{
|
|
insert_some_chars (nfd, lendiff);
|
|
_rl_last_c_pos += lendiff;
|
|
}
|
|
else
|
|
{
|
|
/* At the end of a line the characters do not have to
|
|
be "inserted". They can just be placed on the screen. */
|
|
_rl_output_some_chars (nfd, lendiff);
|
|
_rl_last_c_pos += lendiff;
|
|
}
|
|
/* Copy (new) chars to screen from first diff to last match. */
|
|
if (((nls - nfd) - lendiff) > 0)
|
|
{
|
|
_rl_output_some_chars (&nfd[lendiff], ((nls - nfd) - lendiff));
|
|
_rl_last_c_pos += ((nls - nfd) - lendiff);
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{ /* cannot insert chars, write to EOL */
|
|
_rl_output_some_chars (nfd, (ne - nfd));
|
|
_rl_last_c_pos += (ne - nfd);
|
|
}
|
|
}
|
|
else /* Delete characters from line. */
|
|
{
|
|
/* If possible and inexpensive to use terminal deletion, then do so. */
|
|
if (term_dc && (2 * (ne - nfd)) >= (-lendiff))
|
|
{
|
|
if (lendiff)
|
|
delete_chars (-lendiff); /* delete (diff) characters */
|
|
|
|
/* Copy (new) chars to screen from first diff to last match */
|
|
if ((nls - nfd) > 0)
|
|
{
|
|
_rl_output_some_chars (nfd, (nls - nfd));
|
|
_rl_last_c_pos += (nls - nfd);
|
|
}
|
|
}
|
|
/* Otherwise, print over the existing material. */
|
|
else
|
|
{
|
|
_rl_output_some_chars (nfd, (ne - nfd));
|
|
_rl_last_c_pos += (ne - nfd);
|
|
clear_to_eol ((oe - old) - (ne - new));
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Tell the update routines that we have moved onto a new (empty) line. */
|
|
rl_on_new_line ()
|
|
{
|
|
if (visible_line)
|
|
visible_line[0] = '\0';
|
|
|
|
_rl_last_c_pos = _rl_last_v_pos = 0;
|
|
_rl_vis_botlin = last_lmargin = 0;
|
|
return 0;
|
|
}
|
|
|
|
/* Actually update the display, period. */
|
|
rl_forced_update_display ()
|
|
{
|
|
if (visible_line)
|
|
{
|
|
register char *temp = visible_line;
|
|
|
|
while (*temp) *temp++ = '\0';
|
|
}
|
|
rl_on_new_line ();
|
|
forced_display++;
|
|
rl_redisplay ();
|
|
return 0;
|
|
}
|
|
|
|
/* Move the cursor from _rl_last_c_pos to NEW, which are buffer indices.
|
|
DATA is the contents of the screen line of interest; i.e., where
|
|
the movement is being done. */
|
|
void
|
|
_rl_move_cursor_relative (new, data)
|
|
int new;
|
|
char *data;
|
|
{
|
|
register int i;
|
|
|
|
/* It may be faster to output a CR, and then move forwards instead
|
|
of moving backwards. */
|
|
if (new + 1 < _rl_last_c_pos - new)
|
|
{
|
|
tputs (term_cr, 1, _rl_output_character_function);
|
|
_rl_last_c_pos = 0;
|
|
}
|
|
|
|
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;
|
|
|
|
#if defined (__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. Return the number of characters output. */
|
|
rl_show_char (c)
|
|
int c;
|
|
{
|
|
int n = 1;
|
|
if (META_CHAR (c) && (_rl_output_meta_chars == 0))
|
|
{
|
|
fprintf (rl_outstream, "M-");
|
|
n += 2;
|
|
c = UNMETA (c);
|
|
}
|
|
|
|
#if defined (DISPLAY_TABS)
|
|
if (c < 32 && c != '\t')
|
|
#else
|
|
if (c < 32)
|
|
#endif /* !DISPLAY_TABS */
|
|
{
|
|
fprintf (rl_outstream, "C-");
|
|
n += 2;
|
|
c += 64;
|
|
}
|
|
|
|
putc (c, rl_outstream);
|
|
fflush (rl_outstream);
|
|
return n;
|
|
}
|
|
|
|
int
|
|
rl_character_len (c, pos)
|
|
register int c, pos;
|
|
{
|
|
if (META_CHAR (c))
|
|
return ((_rl_output_meta_chars == 0) ? 4 : 1);
|
|
|
|
if (c == '\t')
|
|
{
|
|
#if defined (DISPLAY_TABS)
|
|
return (((pos | (int)7) + 1) - pos);
|
|
#else
|
|
return (2);
|
|
#endif /* !DISPLAY_TABS */
|
|
}
|
|
|
|
return ((isprint (c)) ? 1 : 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 ();
|
|
return 0;
|
|
}
|
|
#else /* !HAVE_VARARGS_H */
|
|
rl_message (format, arg1, arg2)
|
|
char *format;
|
|
{
|
|
sprintf (msg_buf, format, arg1, arg2);
|
|
rl_display_prompt = msg_buf;
|
|
rl_redisplay ();
|
|
return 0;
|
|
}
|
|
#endif /* !HAVE_VARARGS_H */
|
|
|
|
/* How to clear things from the "echo-area". */
|
|
rl_clear_message ()
|
|
{
|
|
rl_display_prompt = rl_prompt;
|
|
rl_redisplay ();
|
|
return 0;
|
|
}
|
|
|
|
rl_reset_line_state ()
|
|
{
|
|
rl_on_new_line ();
|
|
|
|
rl_display_prompt = rl_prompt ? rl_prompt : "";
|
|
forced_display = 1;
|
|
return 0;
|
|
}
|
|
|
|
/* 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;
|
|
{
|
|
#if !defined (__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;
|
|
{
|
|
#if defined (__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, count, count);
|
|
tputs (buffer, count, _rl_output_character_function);
|
|
}
|
|
else
|
|
{
|
|
if (term_dc && *term_dc)
|
|
while (count--)
|
|
tputs (term_dc, 1, _rl_output_character_function);
|
|
}
|
|
#endif /* !__GO32__ */
|
|
}
|