summaryrefslogtreecommitdiffstats
path: root/lib/readline/display.c
diff options
context:
space:
mode:
authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 15:38:56 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 15:38:56 +0000
commit6c20c8ed2cb9ab69a1a57ccb2b9b79969a808321 (patch)
treef63ce19d57fad3ac4a15bc26dbfbfa2b834111b5 /lib/readline/display.c
parentInitial commit. (diff)
downloadbash-6c20c8ed2cb9ab69a1a57ccb2b9b79969a808321.tar.xz
bash-6c20c8ed2cb9ab69a1a57ccb2b9b79969a808321.zip
Adding upstream version 5.2.15.upstream/5.2.15upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'lib/readline/display.c')
-rw-r--r--lib/readline/display.c3583
1 files changed, 3583 insertions, 0 deletions
diff --git a/lib/readline/display.c b/lib/readline/display.c
new file mode 100644
index 0000000..c1135ec
--- /dev/null
+++ b/lib/readline/display.c
@@ -0,0 +1,3583 @@
+/* display.c -- readline redisplay facility. */
+
+/* Copyright (C) 1987-2022 Free Software Foundation, Inc.
+
+ This file is part of the GNU Readline Library (Readline), a library
+ for reading lines of text with interactive input and history editing.
+
+ Readline is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ Readline is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with Readline. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#define READLINE_LIBRARY
+
+#if defined (HAVE_CONFIG_H)
+# include <config.h>
+#endif
+
+#include <sys/types.h>
+
+#if defined (HAVE_UNISTD_H)
+# include <unistd.h>
+#endif /* HAVE_UNISTD_H */
+
+#include "posixstat.h"
+
+#if defined (HAVE_STDLIB_H)
+# include <stdlib.h>
+#else
+# include "ansi_stdlib.h"
+#endif /* HAVE_STDLIB_H */
+
+#include <stdio.h>
+
+#ifdef __MSDOS__
+# include <pc.h>
+#endif
+
+/* System-specific feature definitions and include files. */
+#include "rldefs.h"
+#include "rlmbutil.h"
+
+/* Termcap library stuff. */
+#include "tcap.h"
+
+/* Some standard library routines. */
+#include "readline.h"
+#include "history.h"
+
+#include "rlprivate.h"
+#include "xmalloc.h"
+
+#if !defined (strchr) && !defined (__STDC__)
+extern char *strchr (), *strrchr ();
+#endif /* !strchr && !__STDC__ */
+
+static void putc_face (int, int, char *);
+static void puts_face (const char *, const char *, int);
+static void norm_face (char *, int);
+
+static void update_line (char *, char *, char *, char *, int, int, int, int);
+static void space_to_eol (int);
+static void delete_chars (int);
+static void insert_some_chars (char *, int, int);
+static void open_some_spaces (int);
+static void cr (void);
+static void redraw_prompt (char *);
+static void _rl_move_cursor_relative (int, const char *, const char *);
+
+/* Values for FLAGS */
+#define PMT_MULTILINE 0x01
+
+static char *expand_prompt (char *, int, int *, int *, int *, int *);
+
+#define DEFAULT_LINE_BUFFER_SIZE 1024
+
+/* State of visible and invisible lines. */
+struct line_state
+ {
+ char *line;
+ char *lface;
+ int *lbreaks;
+ int lbsize;
+#if defined (HANDLE_MULTIBYTE)
+ int wbsize;
+ int *wrapped_line;
+#endif
+ };
+
+/* The line display buffers. One is the line currently displayed on
+ the screen. The other is the line about to be displayed. */
+static struct line_state line_state_array[2];
+static struct line_state *line_state_visible = &line_state_array[0];
+static struct line_state *line_state_invisible = &line_state_array[1];
+static int line_structures_initialized = 0;
+
+/* Backwards-compatible names. */
+#define inv_lbreaks (line_state_invisible->lbreaks)
+#define inv_lbsize (line_state_invisible->lbsize)
+#define vis_lbreaks (line_state_visible->lbreaks)
+#define vis_lbsize (line_state_visible->lbsize)
+
+#define visible_line (line_state_visible->line)
+#define vis_face (line_state_visible->lface)
+#define invisible_line (line_state_invisible->line)
+#define inv_face (line_state_invisible->lface)
+
+#if defined (HANDLE_MULTIBYTE)
+static int _rl_col_width (const char *, int, int, int);
+#else
+# define _rl_col_width(l, s, e, f) (((e) <= (s)) ? 0 : (e) - (s))
+#endif
+
+/* Heuristic used to decide whether it is faster to move from CUR to NEW
+ by backing up or outputting a carriage return and moving forward. CUR
+ and NEW are either both buffer positions or absolute screen positions. */
+#define CR_FASTER(new, cur) (((new) + 1) < ((cur) - (new)))
+
+/* _rl_last_c_pos is an absolute cursor position in multibyte locales and a
+ buffer index in others. This macro is used when deciding whether the
+ current cursor position is in the middle of a prompt string containing
+ invisible characters. XXX - might need to take `modmark' into account. */
+/* XXX - only valid when tested against _rl_last_c_pos; buffer indices need
+ to use prompt_last_invisible directly. */
+#define PROMPT_ENDING_INDEX \
+ ((MB_CUR_MAX > 1 && rl_byte_oriented == 0) ? prompt_physical_chars : prompt_last_invisible+1)
+
+#define FACE_NORMAL '0'
+#define FACE_STANDOUT '1'
+#define FACE_INVALID ((char)1)
+
+/* **************************************************************** */
+/* */
+/* Display stuff */
+/* */
+/* **************************************************************** */
+
+/* This is the stuff that is hard for me. I never seem to write good
+ display routines in C. Let's see how I do this time. */
+
+/* (PWP) Well... Good for a simple line updater, but totally ignores
+ the problems of input lines longer than the screen width.
+
+ update_line and the code that calls it makes a multiple line,
+ automatically wrapping line update. Careful attention needs
+ to be paid to the vertical position variables. */
+
+/* Keep two buffers; one which reflects the current contents of the
+ screen, and the other to draw what we think the new contents should
+ be. Then compare the buffers, and make whatever changes to the
+ screen itself that we should. Finally, make the buffer that we
+ just drew into be the one which reflects the current contents of the
+ screen, and place the cursor where it belongs.
+
+ Commands that want to can fix the display themselves, and then let
+ this function know that the display has been fixed by setting the
+ RL_DISPLAY_FIXED variable. This is good for efficiency. */
+
+/* Application-specific redisplay function. */
+rl_voidfunc_t *rl_redisplay_function = rl_redisplay;
+
+/* Global variables declared here. */
+/* What YOU turn on when you have handled all redisplay yourself. */
+int rl_display_fixed = 0;
+
+/* The stuff that gets printed out before the actual text of the line.
+ This is usually pointing to rl_prompt. */
+char *rl_display_prompt = (char *)NULL;
+
+/* Variables used to include the editing mode in the prompt. */
+char *_rl_emacs_mode_str;
+int _rl_emacs_modestr_len;
+
+char *_rl_vi_ins_mode_str;
+int _rl_vi_ins_modestr_len;
+
+char *_rl_vi_cmd_mode_str;
+int _rl_vi_cmd_modestr_len;
+
+/* Pseudo-global variables declared here. */
+
+/* Hints for other parts of readline to give to the display engine. */
+int _rl_suppress_redisplay = 0;
+int _rl_want_redisplay = 0;
+
+/* The visible cursor position. If you print some text, adjust this. */
+/* NOTE: _rl_last_c_pos is used as a buffer index when not in a locale
+ supporting multibyte characters, and an absolute cursor position when
+ in such a locale. This is an artifact of the donated multibyte support.
+ Care must be taken when modifying its value. */
+int _rl_last_c_pos = 0;
+int _rl_last_v_pos = 0;
+
+/* Number of physical lines consumed by the current line buffer currently
+ on screen minus 1. */
+int _rl_vis_botlin = 0;
+
+static int _rl_quick_redisplay = 0;
+
+/* This is a hint update_line gives to rl_redisplay that it has adjusted the
+ value of _rl_last_c_pos *and* taken the presence of any invisible chars in
+ the prompt into account. rl_redisplay notes this and does not do the
+ adjustment itself. */
+static int cpos_adjusted;
+
+/* The index into the line buffer corresponding to the cursor position */
+static int cpos_buffer_position;
+
+/* A flag to note when we're displaying the first line of the prompt */
+static int displaying_prompt_first_line;
+/* The number of multibyte characters in the prompt, if any */
+static int prompt_multibyte_chars;
+
+static int _rl_inv_botlin = 0;
+
+/* Variables used only in this file. */
+/* The last left edge of text that was displayed. This is used when
+ doing horizontal scrolling. It shifts in thirds of a screenwidth. */
+static int last_lmargin;
+
+/* A buffer for `modeline' messages. */
+static char *msg_buf = 0;
+static int msg_bufsiz = 0;
+
+/* Non-zero forces the redisplay even if we thought it was unnecessary. */
+static int forced_display;
+
+/* Default and initial buffer size. Can grow. */
+static int line_size = 0;
+
+/* Set to a non-zero value if horizontal scrolling has been enabled
+ automatically because the terminal was resized to height 1. */
+static int horizontal_scrolling_autoset = 0; /* explicit initialization */
+
+/* Variables to keep track of the expanded prompt string, which may
+ include invisible characters. */
+
+static char *local_prompt, *local_prompt_prefix;
+static int local_prompt_len;
+static int prompt_prefix_length;
+/* Number of chars in the buffer that contribute to visible chars on the screen.
+ This might be different from the number of physical chars in the presence
+ of multibyte characters */
+static int prompt_visible_length;
+
+/* The number of invisible characters in the line currently being
+ displayed on the screen. */
+static int visible_wrap_offset;
+
+/* The number of invisible characters in the prompt string. Static so it
+ can be shared between rl_redisplay and update_line */
+static int wrap_offset;
+
+/* The index of the last invisible character in the prompt string. */
+static int prompt_last_invisible;
+
+/* The length (buffer offset) of the first line of the last (possibly
+ multi-line) buffer displayed on the screen. */
+static int visible_first_line_len;
+
+/* Number of invisible characters on the first physical line of the prompt.
+ Only valid when the number of physical characters in the prompt exceeds
+ (or is equal to) _rl_screenwidth. */
+static int prompt_invis_chars_first_line;
+
+static int prompt_last_screen_line;
+
+static int prompt_physical_chars;
+
+/* An array of indexes into the prompt string where we will break physical
+ screen lines. It's easier to compute in expand_prompt and use later in
+ rl_redisplay instead of having rl_redisplay try to guess about invisible
+ characters in the prompt or use heuristics about where they are. */
+static int *local_prompt_newlines;
+
+/* set to a non-zero value by rl_redisplay if we are marking modified history
+ lines and the current line is so marked. */
+static int modmark;
+
+static int line_totbytes;
+
+/* Variables to save and restore prompt and display information. */
+
+/* These are getting numerous enough that it's time to create a struct. */
+
+static char *saved_local_prompt;
+static char *saved_local_prefix;
+static int *saved_local_prompt_newlines;
+
+static int saved_last_invisible;
+static int saved_visible_length;
+static int saved_prefix_length;
+static int saved_local_length;
+static int saved_invis_chars_first_line;
+static int saved_physical_chars;
+
+/* Return a string indicating the editing mode, for use in the prompt. */
+
+static char *
+prompt_modestr (int *lenp)
+{
+ if (rl_editing_mode == emacs_mode)
+ {
+ if (lenp)
+ *lenp = _rl_emacs_mode_str ? _rl_emacs_modestr_len : RL_EMACS_MODESTR_DEFLEN;
+ return _rl_emacs_mode_str ? _rl_emacs_mode_str : RL_EMACS_MODESTR_DEFAULT;
+ }
+ else if (_rl_keymap == vi_insertion_keymap)
+ {
+ if (lenp)
+ *lenp = _rl_vi_ins_mode_str ? _rl_vi_ins_modestr_len : RL_VI_INS_MODESTR_DEFLEN;
+ return _rl_vi_ins_mode_str ? _rl_vi_ins_mode_str : RL_VI_INS_MODESTR_DEFAULT; /* vi insert mode */
+ }
+ else
+ {
+ if (lenp)
+ *lenp = _rl_vi_cmd_mode_str ? _rl_vi_cmd_modestr_len : RL_VI_CMD_MODESTR_DEFLEN;
+ return _rl_vi_cmd_mode_str ? _rl_vi_cmd_mode_str : RL_VI_CMD_MODESTR_DEFAULT; /* vi command mode */
+ }
+}
+
+/* Expand the prompt string S and return the number of visible
+ characters in *LP, if LP is not null. This is currently more-or-less
+ a placeholder for expansion. LIP, if non-null is a place to store the
+ index of the last invisible character in the returned string. NIFLP,
+ if non-zero, is a place to store the number of invisible characters in
+ the first prompt line. The previous are used as byte counts -- indexes
+ into a character buffer. *VLP gets the number of physical characters in
+ the expanded prompt (visible length) */
+
+/* Current implementation:
+ \001 (^A) start non-visible characters
+ \002 (^B) end non-visible characters
+ all characters except \001 and \002 (following a \001) are copied to
+ the returned string; all characters except those between \001 and
+ \002 are assumed to be `visible'. */
+
+/* Possible values for FLAGS:
+ PMT_MULTILINE caller indicates that this is part of a multiline prompt
+*/
+
+/* This approximates the number of lines the prompt will take when displayed */
+#define APPROX_DIV(n, d) (((n) < (d)) ? 1 : ((n) / (d)) + 1)
+
+static char *
+expand_prompt (char *pmt, int flags, int *lp, int *lip, int *niflp, int *vlp)
+{
+ char *r, *ret, *p, *igstart, *nprompt, *ms;
+ int l, rl, last, ignoring, ninvis, invfl, invflset, ind, pind, physchars;
+ int mlen, newlines, newlines_guess, bound, can_add_invis;
+ int mb_cur_max;
+
+ /* We only expand the mode string for the last line of a multiline prompt
+ (a prompt with embedded newlines). */
+ ms = (((pmt == rl_prompt) ^ (flags & PMT_MULTILINE)) && _rl_show_mode_in_prompt) ? prompt_modestr (&mlen) : 0;
+ if (ms)
+ {
+ l = strlen (pmt);
+ nprompt = (char *)xmalloc (l + mlen + 1);
+ memcpy (nprompt, ms, mlen);
+ strcpy (nprompt + mlen, pmt);
+ }
+ else
+ nprompt = pmt;
+
+ can_add_invis = 0;
+ mb_cur_max = MB_CUR_MAX;
+
+ if (_rl_screenwidth == 0)
+ _rl_get_screen_size (0, 0); /* avoid division by zero */
+
+ /* Short-circuit if we can. We can do this if we are treating the prompt as
+ a sequence of bytes and there are no invisible characters in the prompt
+ to deal with. Since we populate local_prompt_newlines, we have to run
+ through the rest of the function if this prompt looks like it's going to
+ be longer than one screen line. */
+ if ((mb_cur_max <= 1 || rl_byte_oriented) && strchr (nprompt, RL_PROMPT_START_IGNORE) == 0)
+ {
+ l = strlen (nprompt);
+ if (l < (_rl_screenwidth > 0 ? _rl_screenwidth : 80))
+ {
+ r = (nprompt == pmt) ? savestring (pmt) : nprompt;
+ if (lp)
+ *lp = l;
+ if (lip)
+ *lip = 0;
+ if (niflp)
+ *niflp = 0;
+ if (vlp)
+ *vlp = l;
+
+ local_prompt_newlines = (int *) xrealloc (local_prompt_newlines, sizeof (int) * 2);
+ local_prompt_newlines[0] = 0;
+ local_prompt_newlines[1] = -1;
+
+ return r;
+ }
+ }
+
+ l = strlen (nprompt); /* XXX */
+ r = ret = (char *)xmalloc (l + 1);
+
+ /* Guess at how many screen lines the prompt will take to size the array that
+ keeps track of where the line wraps happen */
+ newlines_guess = (_rl_screenwidth > 0) ? APPROX_DIV(l, _rl_screenwidth) : APPROX_DIV(l, 80);
+ local_prompt_newlines = (int *) xrealloc (local_prompt_newlines, sizeof (int) * (newlines_guess + 1));
+ local_prompt_newlines[newlines = 0] = 0;
+ for (rl = 1; rl <= newlines_guess; rl++)
+ local_prompt_newlines[rl] = -1;
+
+ rl = physchars = 0; /* mode string now part of nprompt */
+ invfl = 0; /* invisible chars in first line of prompt */
+ invflset = 0; /* we only want to set invfl once */
+ igstart = 0; /* we're not ignoring any characters yet */
+
+ for (ignoring = last = ninvis = 0, p = nprompt; p && *p; p++)
+ {
+ /* This code strips the invisible character string markers
+ RL_PROMPT_START_IGNORE and RL_PROMPT_END_IGNORE */
+ if (ignoring == 0 && *p == RL_PROMPT_START_IGNORE) /* XXX - check ignoring? */
+ {
+ ignoring = 1;
+ igstart = p;
+ continue;
+ }
+ else if (ignoring && *p == RL_PROMPT_END_IGNORE)
+ {
+ ignoring = 0;
+ /* If we have a run of invisible characters, adjust local_prompt_newlines
+ to add them, since update_line expects them to be counted before
+ wrapping the line. */
+ if (can_add_invis)
+ {
+ local_prompt_newlines[newlines] = r - ret;
+ /* If we're adding to the number of invisible characters on the
+ first line of the prompt, but we've already set the number of
+ invisible characters on that line, we need to adjust the
+ counter. */
+ if (invflset && newlines == 1)
+ invfl = ninvis;
+ }
+ if (p != (igstart + 1))
+ last = r - ret - 1;
+ continue;
+ }
+ else
+ {
+#if defined (HANDLE_MULTIBYTE)
+ if (mb_cur_max > 1 && rl_byte_oriented == 0)
+ {
+ pind = p - nprompt;
+ ind = _rl_find_next_mbchar (nprompt, pind, 1, MB_FIND_NONZERO);
+ l = ind - pind;
+ while (l--)
+ *r++ = *p++;
+ if (!ignoring)
+ {
+ /* rl ends up being assigned to prompt_visible_length,
+ which is the number of characters in the buffer that
+ contribute to characters on the screen, which might
+ not be the same as the number of physical characters
+ on the screen in the presence of multibyte characters */
+ rl += ind - pind;
+ physchars += _rl_col_width (nprompt, pind, ind, 0);
+ }
+ else
+ ninvis += ind - pind;
+ p--; /* compensate for later increment */
+ }
+ else
+#endif
+ {
+ *r++ = *p;
+ if (!ignoring)
+ {
+ rl++; /* visible length byte counter */
+ physchars++;
+ }
+ else
+ ninvis++; /* invisible chars byte counter */
+ }
+
+ if (invflset == 0 && physchars >= _rl_screenwidth)
+ {
+ invfl = ninvis;
+ invflset = 1;
+ }
+
+ if (physchars >= (bound = (newlines + 1) * _rl_screenwidth) && local_prompt_newlines[newlines+1] == -1)
+ {
+ int new;
+ if (physchars > bound) /* should rarely happen */
+ {
+#if defined (HANDLE_MULTIBYTE)
+ *r = '\0'; /* need null-termination for strlen */
+ if (mb_cur_max > 1 && rl_byte_oriented == 0)
+ new = _rl_find_prev_mbchar (ret, r - ret, MB_FIND_ANY);
+ else
+#endif
+ new = r - ret - (physchars - bound); /* XXX */
+ }
+ else
+ new = r - ret;
+ local_prompt_newlines[++newlines] = new;
+ }
+
+ /* What if a physical character of width >= 2 is split? There is
+ code that wraps before the physical screen width if the character
+ width would exceed it, but it needs to be checked against this
+ code and local_prompt_newlines[]. */
+ if (ignoring == 0)
+ can_add_invis = (physchars == bound);
+ }
+ }
+
+ if (rl <= _rl_screenwidth)
+ invfl = ninvis;
+
+ *r = '\0';
+ if (lp)
+ *lp = rl;
+ if (lip)
+ *lip = last;
+ if (niflp)
+ *niflp = invfl;
+ if (vlp)
+ *vlp = physchars;
+
+ if (nprompt != pmt)
+ xfree (nprompt);
+
+ return ret;
+}
+
+/* Just strip out RL_PROMPT_START_IGNORE and RL_PROMPT_END_IGNORE from
+ PMT and return the rest of PMT. */
+char *
+_rl_strip_prompt (char *pmt)
+{
+ char *ret;
+
+ ret = expand_prompt (pmt, 0, (int *)NULL, (int *)NULL, (int *)NULL, (int *)NULL);
+ return ret;
+}
+
+void
+_rl_reset_prompt (void)
+{
+ rl_visible_prompt_length = rl_expand_prompt (rl_prompt);
+}
+
+/*
+ * Expand the prompt string into the various display components, if
+ * necessary.
+ *
+ * local_prompt = expanded last line of string in rl_display_prompt
+ * (portion after the final newline)
+ * local_prompt_prefix = portion before last newline of rl_display_prompt,
+ * expanded via expand_prompt
+ * prompt_visible_length = number of visible characters in local_prompt
+ * prompt_prefix_length = number of visible characters in local_prompt_prefix
+ *
+ * It also tries to keep track of the number of invisible characters in the
+ * prompt string, and where they are.
+ *
+ * This function is called once per call to readline(). It may also be
+ * called arbitrarily to expand the primary prompt.
+ *
+ * The return value is the number of visible characters on the last line
+ * of the (possibly multi-line) prompt. In this case, multi-line means
+ * there are embedded newlines in the prompt string itself, not that the
+ * number of physical characters exceeds the screen width and the prompt
+ * wraps.
+ */
+int
+rl_expand_prompt (char *prompt)
+{
+ char *p, *t;
+ int c;
+
+ /* Clear out any saved values. */
+ FREE (local_prompt);
+ FREE (local_prompt_prefix);
+
+ local_prompt = local_prompt_prefix = (char *)0;
+ local_prompt_len = 0;
+ prompt_last_invisible = prompt_invis_chars_first_line = 0;
+ prompt_visible_length = prompt_physical_chars = 0;
+
+ if (prompt == 0 || *prompt == 0)
+ return (0);
+
+ p = strrchr (prompt, '\n');
+ if (p == 0)
+ {
+ /* The prompt is only one logical line, though it might wrap. */
+ local_prompt = expand_prompt (prompt, 0, &prompt_visible_length,
+ &prompt_last_invisible,
+ &prompt_invis_chars_first_line,
+ &prompt_physical_chars);
+ local_prompt_prefix = (char *)0;
+ local_prompt_len = local_prompt ? strlen (local_prompt) : 0;
+ return (prompt_visible_length);
+ }
+ else
+ {
+ /* The prompt spans multiple lines. */
+ t = ++p;
+ c = *t; *t = '\0';
+ /* The portion of the prompt string up to and including the
+ final newline is now null-terminated. */
+ local_prompt_prefix = expand_prompt (prompt, PMT_MULTILINE,
+ &prompt_prefix_length,
+ (int *)NULL,
+ (int *)NULL,
+ (int *)NULL);
+ *t = c;
+
+ local_prompt = expand_prompt (p, PMT_MULTILINE,
+ &prompt_visible_length,
+ &prompt_last_invisible,
+ &prompt_invis_chars_first_line,
+ &prompt_physical_chars);
+ local_prompt_len = local_prompt ? strlen (local_prompt) : 0;
+ return (prompt_prefix_length);
+ }
+}
+
+/* Allocate the various line structures, making sure they can hold MINSIZE
+ bytes. If the existing line size can accommodate MINSIZE bytes, don't do
+ anything. */
+static void
+realloc_line (int minsize)
+{
+ int minimum_size;
+ int newsize, delta;
+
+ minimum_size = DEFAULT_LINE_BUFFER_SIZE;
+ if (minsize < minimum_size)
+ minsize = minimum_size;
+ if (minsize <= _rl_screenwidth) /* XXX - for gdb */
+ minsize = _rl_screenwidth + 1;
+ if (line_size >= minsize)
+ return;
+
+ newsize = minimum_size;
+ while (newsize < minsize)
+ newsize *= 2;
+
+ visible_line = (char *)xrealloc (visible_line, newsize);
+ vis_face = (char *)xrealloc (vis_face, newsize);
+
+ invisible_line = (char *)xrealloc (invisible_line, newsize);
+ inv_face = (char *)xrealloc (inv_face, newsize);
+
+ delta = newsize - line_size;
+ memset (visible_line + line_size, 0, delta);
+ memset (vis_face + line_size, FACE_NORMAL, delta);
+ memset (invisible_line + line_size, 1, delta);
+ memset (inv_face + line_size, FACE_INVALID, delta);
+
+ line_size = newsize;
+}
+
+/* Initialize the VISIBLE_LINE and INVISIBLE_LINE arrays, and their associated
+ arrays of line break markers. MINSIZE is the minimum size of VISIBLE_LINE
+ and INVISIBLE_LINE; if it is greater than LINE_SIZE, LINE_SIZE is
+ increased. If the lines have already been allocated, this ensures that
+ they can hold at least MINSIZE characters. */
+static void
+init_line_structures (int minsize)
+{
+ if (invisible_line == 0) /* initialize it */
+ {
+ if (line_size > minsize)
+ minsize = line_size;
+ }
+ realloc_line (minsize);
+
+ if (vis_lbreaks == 0)
+ {
+ /* should be enough. */
+ inv_lbsize = vis_lbsize = 256;
+
+#if defined (HANDLE_MULTIBYTE)
+ line_state_visible->wbsize = vis_lbsize;
+ line_state_visible->wrapped_line = (int *)xmalloc (line_state_visible->wbsize * sizeof (int));
+
+ line_state_invisible->wbsize = inv_lbsize;
+ line_state_invisible->wrapped_line = (int *)xmalloc (line_state_invisible->wbsize * sizeof (int));
+#endif
+
+ inv_lbreaks = (int *)xmalloc (inv_lbsize * sizeof (int));
+ vis_lbreaks = (int *)xmalloc (vis_lbsize * sizeof (int));
+ inv_lbreaks[0] = vis_lbreaks[0] = 0;
+ }
+
+ line_structures_initialized = 1;
+}
+
+/* Convenience functions to add chars to the invisible line that update the
+ face information at the same time. */
+static void /* XXX - change this */
+invis_addc (int *outp, char c, char face)
+{
+ realloc_line (*outp + 1);
+ invisible_line[*outp] = c;
+ inv_face[*outp] = face;
+ *outp += 1;
+}
+
+static void
+invis_adds (int *outp, const char *str, int n, char face)
+{
+ int i;
+
+ for (i = 0; i < n; i++)
+ invis_addc (outp, str[i], face);
+}
+
+static void
+invis_nul (int *outp)
+{
+ invis_addc (outp, '\0', 0);
+ *outp -= 1;
+}
+
+static void
+set_active_region (int *beg, int *end)
+{
+ if (rl_point >= 0 && rl_point <= rl_end && rl_mark >= 0 && rl_mark <= rl_end)
+ {
+ *beg = (rl_mark < rl_point) ? rl_mark : rl_point;
+ *end = (rl_mark < rl_point) ? rl_point : rl_mark;
+ }
+}
+
+/* Do whatever tests are necessary and tell update_line that it can do a
+ quick, dumb redisplay on the assumption that there are so many
+ differences between the old and new lines that it would be a waste to
+ compute all the differences.
+ Right now, it just sets _rl_quick_redisplay if the current visible line
+ is a single line (so we don't have to move vertically or mess with line
+ wrapping). */
+void
+_rl_optimize_redisplay (void)
+{
+ if (_rl_vis_botlin == 0)
+ _rl_quick_redisplay = 1;
+}
+
+/* Basic redisplay algorithm. See comments inline. */
+void
+rl_redisplay (void)
+{
+ int in, out, c, linenum, cursor_linenum;
+ int inv_botlin, lb_botlin, lb_linenum, o_cpos;
+ int newlines, lpos, temp, n0, num, prompt_lines_estimate;
+ char *prompt_this_line;
+ char cur_face;
+ int hl_begin, hl_end;
+ int mb_cur_max = MB_CUR_MAX;
+#if defined (HANDLE_MULTIBYTE)
+ WCHAR_T wc;
+ size_t wc_bytes;
+ int wc_width;
+ mbstate_t ps;
+ int _rl_wrapped_multicolumn = 0;
+#endif
+
+ if (_rl_echoing_p == 0)
+ return;
+
+ /* Block keyboard interrupts because this function manipulates global
+ data structures. */
+ _rl_block_sigint ();
+ RL_SETSTATE (RL_STATE_REDISPLAYING);
+
+ cur_face = FACE_NORMAL;
+ /* Can turn this into an array for multiple highlighted objects in addition
+ to the region */
+ hl_begin = hl_end = -1;
+
+ if (rl_mark_active_p ())
+ set_active_region (&hl_begin, &hl_end);
+
+ if (!rl_display_prompt)
+ rl_display_prompt = "";
+
+ if (line_structures_initialized == 0)
+ {
+ init_line_structures (0);
+ rl_on_new_line ();
+ }
+ else if (line_size <= _rl_screenwidth)
+ init_line_structures (_rl_screenwidth + 1);
+
+ /* Enable horizontal scrolling automatically for terminals of height 1
+ where wrapping lines doesn't work. Disable it as soon as the terminal
+ height is increased again if it was automatically enabled. */
+ if (_rl_screenheight <= 1)
+ {
+ if (_rl_horizontal_scroll_mode == 0)
+ horizontal_scrolling_autoset = 1;
+ _rl_horizontal_scroll_mode = 1;
+ }
+ else if (horizontal_scrolling_autoset)
+ _rl_horizontal_scroll_mode = 0;
+
+ /* Draw the line into the buffer. */
+ cpos_buffer_position = -1;
+
+ prompt_multibyte_chars = prompt_visible_length - prompt_physical_chars;
+
+ out = inv_botlin = 0;
+
+ /* Mark the line as modified or not. We only do this for history
+ lines. */
+ modmark = 0;
+ if (_rl_mark_modified_lines && current_history () && rl_undo_list)
+ {
+ invis_addc (&out, '*', cur_face);
+ invis_nul (&out);
+ modmark = 1;
+ }
+
+ /* If someone thought that the redisplay was handled, but the currently
+ visible line has a different modification state than the one about
+ to become visible, then correct the caller's misconception. */
+ if (visible_line[0] != invisible_line[0])
+ rl_display_fixed = 0;
+
+ /* If the prompt to be displayed is the `primary' readline prompt (the
+ one passed to readline()), use the values we have already expanded.
+ If not, use what's already in rl_display_prompt. WRAP_OFFSET is the
+ number of non-visible characters (bytes) in the prompt string. */
+ /* This is where we output the characters in the prompt before the last
+ newline, if any. If there aren't any embedded newlines, we don't
+ write anything. Copy the last line of the prompt string into the line in
+ any case */
+ if (rl_display_prompt == rl_prompt || local_prompt)
+ {
+ if (local_prompt_prefix && forced_display)
+ _rl_output_some_chars (local_prompt_prefix, strlen (local_prompt_prefix));
+
+ if (local_prompt_len > 0)
+ invis_adds (&out, local_prompt, local_prompt_len, cur_face);
+ invis_nul (&out);
+ wrap_offset = local_prompt_len - prompt_visible_length;
+ }
+ else
+ {
+ int pmtlen;
+ prompt_this_line = strrchr (rl_display_prompt, '\n');
+ if (!prompt_this_line)
+ prompt_this_line = rl_display_prompt;
+ else
+ {
+ prompt_this_line++;
+ pmtlen = prompt_this_line - rl_display_prompt; /* temp var */
+ if (forced_display)
+ {
+ _rl_output_some_chars (rl_display_prompt, pmtlen);
+ /* Make sure we are at column zero even after a newline,
+ regardless of the state of terminal output processing. */
+ if (pmtlen < 2 || prompt_this_line[-2] != '\r')
+ cr ();
+ }
+ }
+
+ prompt_physical_chars = pmtlen = strlen (prompt_this_line); /* XXX */
+ invis_adds (&out, prompt_this_line, pmtlen, cur_face);
+ invis_nul (&out);
+ wrap_offset = prompt_invis_chars_first_line = 0;
+ }
+
+#if defined (HANDLE_MULTIBYTE)
+#define CHECK_INV_LBREAKS() \
+ do { \
+ if (newlines >= (inv_lbsize - 2)) \
+ { \
+ inv_lbsize *= 2; \
+ inv_lbreaks = (int *)xrealloc (inv_lbreaks, inv_lbsize * sizeof (int)); \
+ } \
+ if (newlines >= (line_state_invisible->wbsize - 2)) \
+ { \
+ line_state_invisible->wbsize *= 2; \
+ line_state_invisible->wrapped_line = (int *)xrealloc (line_state_invisible->wrapped_line, line_state_invisible->wbsize * sizeof(int)); \
+ } \
+ } while (0)
+#else
+#define CHECK_INV_LBREAKS() \
+ do { \
+ if (newlines >= (inv_lbsize - 2)) \
+ { \
+ inv_lbsize *= 2; \
+ inv_lbreaks = (int *)xrealloc (inv_lbreaks, inv_lbsize * sizeof (int)); \
+ } \
+ } while (0)
+#endif /* !HANDLE_MULTIBYTE */
+
+#if defined (HANDLE_MULTIBYTE)
+#define CHECK_LPOS() \
+ do { \
+ lpos++; \
+ if (lpos >= _rl_screenwidth) \
+ { \
+ if (newlines >= (inv_lbsize - 2)) \
+ { \
+ inv_lbsize *= 2; \
+ inv_lbreaks = (int *)xrealloc (inv_lbreaks, inv_lbsize * sizeof (int)); \
+ } \
+ inv_lbreaks[++newlines] = out; \
+ if (newlines >= (line_state_invisible->wbsize - 2)) \
+ { \
+ line_state_invisible->wbsize *= 2; \
+ line_state_invisible->wrapped_line = (int *)xrealloc (line_state_invisible->wrapped_line, line_state_invisible->wbsize * sizeof(int)); \
+ } \
+ line_state_invisible->wrapped_line[newlines] = _rl_wrapped_multicolumn; \
+ lpos = 0; \
+ } \
+ } while (0)
+#else
+#define CHECK_LPOS() \
+ do { \
+ lpos++; \
+ if (lpos >= _rl_screenwidth) \
+ { \
+ if (newlines >= (inv_lbsize - 2)) \
+ { \
+ inv_lbsize *= 2; \
+ inv_lbreaks = (int *)xrealloc (inv_lbreaks, inv_lbsize * sizeof (int)); \
+ } \
+ inv_lbreaks[++newlines] = out; \
+ lpos = 0; \
+ } \
+ } while (0)
+#endif
+
+ /* inv_lbreaks[i] is where line i starts in the buffer. */
+ inv_lbreaks[newlines = 0] = 0;
+ /* lpos is a physical cursor position, so it needs to be adjusted by the
+ number of invisible characters in the prompt, per line. We compute
+ the line breaks in the prompt string in expand_prompt, taking invisible
+ characters into account, and if lpos exceeds the screen width, we copy
+ the data in the loop below. */
+ lpos = prompt_physical_chars + modmark;
+
+#if defined (HANDLE_MULTIBYTE)
+ memset (line_state_invisible->wrapped_line, 0, line_state_invisible->wbsize * sizeof (int));
+ num = 0;
+#endif
+
+ /* prompt_invis_chars_first_line is the number of invisible characters (bytes)
+ in the first physical line of the prompt.
+ wrap_offset - prompt_invis_chars_first_line is usually the number of
+ invis chars on the second (or, more generally, last) line. */
+
+ /* This is zero-based, used to set the newlines */
+ prompt_lines_estimate = lpos / _rl_screenwidth;
+
+ /* what if lpos is already >= _rl_screenwidth before we start drawing the
+ contents of the command line? */
+ if (lpos >= _rl_screenwidth)
+ {
+ temp = 0;
+
+ /* first copy the linebreaks array we computed in expand_prompt */
+ while (local_prompt_newlines[newlines+1] != -1)
+ {
+ temp = local_prompt_newlines[newlines+1];
+ inv_lbreaks[++newlines] = temp;
+ }
+
+ /* Now set lpos from the last newline */
+ if (mb_cur_max > 1 && rl_byte_oriented == 0 && prompt_multibyte_chars > 0)
+ lpos = _rl_col_width (local_prompt, temp, local_prompt_len, 1) - (wrap_offset - prompt_invis_chars_first_line);
+ else
+ lpos -= (_rl_screenwidth * newlines);
+ }
+
+ prompt_last_screen_line = newlines;
+
+ /* Draw the rest of the line (after the prompt) into invisible_line, keeping
+ track of where the cursor is (cpos_buffer_position), the number of the
+ line containing the cursor (lb_linenum), the last line number (lb_botlin
+ and inv_botlin).
+ It maintains an array of line breaks for display (inv_lbreaks).
+ This handles expanding tabs for display and displaying meta characters. */
+ lb_linenum = 0;
+#if defined (HANDLE_MULTIBYTE)
+ in = 0;
+ if (mb_cur_max > 1 && rl_byte_oriented == 0)
+ {
+ memset (&ps, 0, sizeof (mbstate_t));
+ if (_rl_utf8locale && UTF8_SINGLEBYTE(rl_line_buffer[0]))
+ {
+ wc = (WCHAR_T)rl_line_buffer[0];
+ wc_bytes = 1;
+ }
+ else
+ wc_bytes = MBRTOWC (&wc, rl_line_buffer, rl_end, &ps);
+ }
+ else
+ wc_bytes = 1;
+ while (in < rl_end)
+#else
+ for (in = 0; in < rl_end; in++)
+#endif
+ {
+ if (in == hl_begin)
+ cur_face = FACE_STANDOUT;
+ else if (in == hl_end)
+ cur_face = FACE_NORMAL;
+
+ c = (unsigned char)rl_line_buffer[in];
+
+#if defined (HANDLE_MULTIBYTE)
+ if (mb_cur_max > 1 && rl_byte_oriented == 0)
+ {
+ if (MB_INVALIDCH (wc_bytes))
+ {
+ /* Byte sequence is invalid or shortened. Assume that the
+ first byte represents a character. */
+ wc_bytes = 1;
+ /* Assume that a character occupies a single column. */
+ wc_width = 1;
+ memset (&ps, 0, sizeof (mbstate_t));
+ }
+ else if (MB_NULLWCH (wc_bytes))
+ break; /* Found '\0' */
+ else
+ {
+ temp = WCWIDTH (wc);
+ wc_width = (temp >= 0) ? temp : 1;
+ }
+ }
+#endif
+
+ if (in == rl_point)
+ {
+ cpos_buffer_position = out;
+ lb_linenum = newlines;
+ }
+
+#if defined (HANDLE_MULTIBYTE)
+ if (META_CHAR (c) && _rl_output_meta_chars == 0) /* XXX - clean up */
+#else
+ if (META_CHAR (c))
+#endif
+ {
+ if (_rl_output_meta_chars == 0)
+ {
+ char obuf[5];
+ int olen;
+
+ olen = sprintf (obuf, "\\%o", c);
+
+ if (lpos + olen >= _rl_screenwidth)
+ {
+ temp = _rl_screenwidth - lpos;
+ CHECK_INV_LBREAKS ();
+ inv_lbreaks[++newlines] = out + temp;
+#if defined (HANDLE_MULTIBYTE)
+ line_state_invisible->wrapped_line[newlines] = _rl_wrapped_multicolumn;
+#endif
+ lpos = olen - temp;
+ }
+ else
+ lpos += olen;
+
+ for (temp = 0; temp < olen; temp++)
+ {
+ invis_addc (&out, obuf[temp], cur_face);
+ CHECK_LPOS ();
+ }
+ }
+ else
+ {
+ invis_addc (&out, c, cur_face);
+ CHECK_LPOS();
+ }
+ }
+#if defined (DISPLAY_TABS)
+ else if (c == '\t')
+ {
+ register int newout;
+
+ newout = out + 8 - lpos % 8;
+ temp = newout - out;
+ if (lpos + temp >= _rl_screenwidth)
+ {
+ register int temp2;
+ temp2 = _rl_screenwidth - lpos;
+ CHECK_INV_LBREAKS ();
+ inv_lbreaks[++newlines] = out + temp2;
+#if defined (HANDLE_MULTIBYTE)
+ line_state_invisible->wrapped_line[newlines] = _rl_wrapped_multicolumn;
+#endif
+ lpos = temp - temp2;
+ while (out < newout)
+ invis_addc (&out, ' ', cur_face);
+ }
+ else
+ {
+ while (out < newout)
+ invis_addc (&out, ' ', cur_face);
+ lpos += temp;
+ }
+ }
+#endif
+ else if (c == '\n' && _rl_horizontal_scroll_mode == 0 && _rl_term_up && *_rl_term_up)
+ {
+ invis_addc (&out, '\0', cur_face);
+ CHECK_INV_LBREAKS ();
+ inv_lbreaks[++newlines] = out;
+#if defined (HANDLE_MULTIBYTE)
+ line_state_invisible->wrapped_line[newlines] = _rl_wrapped_multicolumn;
+#endif
+ lpos = 0;
+ }
+ else if (CTRL_CHAR (c) || c == RUBOUT)
+ {
+ invis_addc (&out, '^', cur_face);
+ CHECK_LPOS();
+ invis_addc (&out, CTRL_CHAR (c) ? UNCTRL (c) : '?', cur_face);
+ CHECK_LPOS();
+ }
+ else
+ {
+#if defined (HANDLE_MULTIBYTE)
+ if (mb_cur_max > 1 && rl_byte_oriented == 0)
+ {
+ register int i;
+
+ _rl_wrapped_multicolumn = 0;
+
+ if (_rl_screenwidth < lpos + wc_width)
+ for (i = lpos; i < _rl_screenwidth; i++)
+ {
+ /* The space will be removed in update_line() */
+ invis_addc (&out, ' ', cur_face);
+ _rl_wrapped_multicolumn++;
+ CHECK_LPOS();
+ }
+ if (in == rl_point)
+ {
+ cpos_buffer_position = out;
+ lb_linenum = newlines;
+ }
+ for (i = in; i < in+wc_bytes; i++)
+ invis_addc (&out, rl_line_buffer[i], cur_face);
+ for (i = 0; i < wc_width; i++)
+ CHECK_LPOS();
+ }
+ else
+ {
+ invis_addc (&out, c, cur_face);
+ CHECK_LPOS();
+ }
+#else
+ invis_addc (&out, c, cur_face);
+ CHECK_LPOS();
+#endif
+ }
+
+#if defined (HANDLE_MULTIBYTE)
+ if (mb_cur_max > 1 && rl_byte_oriented == 0)
+ {
+ in += wc_bytes;
+ if (_rl_utf8locale && UTF8_SINGLEBYTE(rl_line_buffer[in]))
+ {
+ wc = (WCHAR_T)rl_line_buffer[in];
+ wc_bytes = 1;
+ memset (&ps, 0, sizeof (mbstate_t)); /* re-init state */
+ }
+ else
+ wc_bytes = MBRTOWC (&wc, rl_line_buffer + in, rl_end - in, &ps);
+ }
+ else
+ in++;
+#endif
+ }
+ invis_nul (&out);
+ line_totbytes = out;
+ if (cpos_buffer_position < 0)
+ {
+ cpos_buffer_position = out;
+ lb_linenum = newlines;
+ }
+
+ /* If we are switching from one line to multiple wrapped lines, we don't
+ want to do a dumb update (or we want to make it smarter). */
+ if (_rl_quick_redisplay && newlines > 0)
+ _rl_quick_redisplay = 0;
+
+ inv_botlin = lb_botlin = _rl_inv_botlin = newlines;
+ CHECK_INV_LBREAKS ();
+ inv_lbreaks[newlines+1] = out;
+#if defined (HANDLE_MULTIBYTE)
+ /* This should be 0 anyway */
+ line_state_invisible->wrapped_line[newlines+1] = _rl_wrapped_multicolumn;
+#endif
+ cursor_linenum = lb_linenum;
+
+ /* CPOS_BUFFER_POSITION == position in buffer where cursor should be placed.
+ CURSOR_LINENUM == line number where the cursor should be placed. */
+
+ /* PWP: now is when things get a bit hairy. The visible and invisible
+ line buffers are really multiple lines, which would wrap every
+ (screenwidth - 1) characters. Go through each in turn, finding
+ the changed region and updating it. The line order is top to bottom. */
+
+ /* If we can move the cursor up and down, then use multiple lines,
+ otherwise, let long lines display in a single terminal line, and
+ horizontally scroll it. */
+ displaying_prompt_first_line = 1;
+ if (_rl_horizontal_scroll_mode == 0 && _rl_term_up && *_rl_term_up)
+ {
+ int nleft, pos, changed_screen_line, tx;
+
+ if (!rl_display_fixed || forced_display)
+ {
+ forced_display = 0;
+
+ /* If we have more than a screenful of material to display, then
+ only display a screenful. We should display the last screen,
+ not the first. */
+ if (out >= _rl_screenchars)
+ {
+#if defined (HANDLE_MULTIBYTE)
+ if (mb_cur_max > 1 && rl_byte_oriented == 0)
+ out = _rl_find_prev_mbchar (invisible_line, _rl_screenchars, MB_FIND_ANY);
+ else
+#endif
+ out = _rl_screenchars - 1;
+ }
+
+ /* The first line is at character position 0 in the buffer. The
+ second and subsequent lines start at inv_lbreaks[N], offset by
+ OFFSET (which has already been calculated above). */
+
+#define INVIS_FIRST() (prompt_physical_chars > _rl_screenwidth ? prompt_invis_chars_first_line : wrap_offset)
+#define WRAP_OFFSET(line, offset) ((line == 0) \
+ ? (offset ? INVIS_FIRST() : 0) \
+ : ((line == prompt_last_screen_line) ? wrap_offset-prompt_invis_chars_first_line : 0))
+#define W_OFFSET(line, offset) ((line) == 0 ? offset : 0)
+#define VIS_LLEN(l) ((l) > _rl_vis_botlin ? 0 : (vis_lbreaks[l+1] - vis_lbreaks[l]))
+#define INV_LLEN(l) (inv_lbreaks[l+1] - inv_lbreaks[l])
+#define VIS_CHARS(line) (visible_line + vis_lbreaks[line])
+#define VIS_FACE(line) (vis_face + vis_lbreaks[line])
+#define VIS_LINE(line) ((line) > _rl_vis_botlin) ? "" : VIS_CHARS(line)
+#define VIS_LINE_FACE(line) ((line) > _rl_vis_botlin) ? "" : VIS_FACE(line)
+#define INV_LINE(line) (invisible_line + inv_lbreaks[line])
+#define INV_LINE_FACE(line) (inv_face + inv_lbreaks[line])
+
+#define OLD_CPOS_IN_PROMPT() (cpos_adjusted == 0 && \
+ _rl_last_c_pos != o_cpos && \
+ _rl_last_c_pos > wrap_offset && \
+ o_cpos < prompt_last_invisible)
+
+
+ /* We don't want to highlight anything that's going to be off the top
+ of the display; if the current line takes up more than an entire
+ screen, just mark the lines that won't be displayed as having a
+ `normal' face.
+ It's imperfect, but better than display corruption. */
+ if (rl_mark_active_p () && inv_botlin > _rl_screenheight)
+ {
+ int extra;
+
+ extra = inv_botlin - _rl_screenheight;
+ for (linenum = 0; linenum <= extra; linenum++)
+ norm_face (INV_LINE_FACE(linenum), INV_LLEN (linenum));
+ }
+
+ /* For each line in the buffer, do the updating display. */
+ for (linenum = 0; linenum <= inv_botlin; linenum++)
+ {
+ /* This can lead us astray if we execute a program that changes
+ the locale from a non-multibyte to a multibyte one. */
+ o_cpos = _rl_last_c_pos;
+ cpos_adjusted = 0;
+ update_line (VIS_LINE(linenum), VIS_LINE_FACE(linenum),
+ INV_LINE(linenum), INV_LINE_FACE(linenum),
+ linenum,
+ VIS_LLEN(linenum), INV_LLEN(linenum), inv_botlin);
+
+ /* update_line potentially changes _rl_last_c_pos, but doesn't
+ take invisible characters into account, since _rl_last_c_pos
+ is an absolute cursor position in a multibyte locale. We
+ choose to (mostly) compensate for that here, rather than
+ change update_line itself. There are several cases in which
+ update_line adjusts _rl_last_c_pos itself (so it can pass
+ _rl_move_cursor_relative accurate values); it communicates
+ this back by setting cpos_adjusted. If we assume that
+ _rl_last_c_pos is correct (an absolute cursor position) each
+ time update_line is called, then we can assume in our
+ calculations that o_cpos does not need to be adjusted by
+ wrap_offset. */
+ if (linenum == 0 && (mb_cur_max > 1 && rl_byte_oriented == 0) && OLD_CPOS_IN_PROMPT())
+ _rl_last_c_pos -= prompt_invis_chars_first_line; /* XXX - was wrap_offset */
+ else if (cpos_adjusted == 0 &&
+ linenum == prompt_last_screen_line &&
+ prompt_physical_chars > _rl_screenwidth &&
+ (mb_cur_max > 1 && rl_byte_oriented == 0) &&
+ _rl_last_c_pos != o_cpos &&
+ _rl_last_c_pos > (prompt_last_invisible - _rl_screenwidth - prompt_invis_chars_first_line)) /* XXX - rethink this last one */
+ /* This assumes that all the invisible characters are split
+ between the first and last lines of the prompt, if the
+ prompt consumes more than two lines. It's usually right */
+ /* XXX - not sure this is ever executed */
+ _rl_last_c_pos -= (wrap_offset-prompt_invis_chars_first_line);
+
+ /* If this is the line with the prompt, we might need to
+ compensate for invisible characters in the new line. Do
+ this only if there is not more than one new line (which
+ implies that we completely overwrite the old visible line)
+ and the new line is shorter than the old. Make sure we are
+ at the end of the new line before clearing. */
+ if (linenum == 0 &&
+ inv_botlin == 0 && _rl_last_c_pos == out &&
+ (wrap_offset > visible_wrap_offset) &&
+ (_rl_last_c_pos < visible_first_line_len))
+ {
+ if (mb_cur_max > 1 && rl_byte_oriented == 0)
+ nleft = _rl_screenwidth - _rl_last_c_pos;
+ else
+ nleft = _rl_screenwidth + wrap_offset - _rl_last_c_pos;
+ if (nleft)
+ _rl_clear_to_eol (nleft);
+ }
+#if 0
+ /* This segment is intended to handle the case where the old
+ visible prompt has invisible characters and the new line
+ to be displayed needs to clear the rest of the old characters
+ out (e.g., when printing the i-search prompt): in general,
+ the case of the new line being shorter than the old. We need
+ to be at the end of the new line and the old line needs to be
+ longer than the current cursor position. It's not perfect,
+ since it uses the byte length of the first line, but this will
+ at worst result in some extra clear-to-end-of-lines. We can't
+ use the prompt length variables because they may not
+ correspond to the visible line (see printing the i-search
+ prompt above). The tests for differing numbers of invisible
+ characters may not matter and can probably be removed. */
+ else if (linenum == 0 &&
+ linenum == prompt_last_screen_line &&
+ _rl_last_c_pos == out &&
+ _rl_last_c_pos < visible_first_line_len &&
+ visible_wrap_offset &&
+ visible_wrap_offset != wrap_offset)
+ {
+ if (mb_cur_max > 1 && rl_byte_oriented == 0)
+ nleft = _rl_screenwidth - _rl_last_c_pos;
+ else
+ nleft = _rl_screenwidth + wrap_offset - _rl_last_c_pos;
+ if (nleft)
+ _rl_clear_to_eol (nleft);
+ }
+#endif
+
+ /* Since the new first line is now visible, save its length. */
+ if (linenum == 0)
+ visible_first_line_len = (inv_botlin > 0) ? inv_lbreaks[1] : out - wrap_offset;
+ }
+
+ /* We may have deleted some lines. If so, clear the left over
+ blank ones at the bottom out. */
+ if (_rl_vis_botlin > inv_botlin)
+ {
+ char *tt;
+ for (; linenum <= _rl_vis_botlin; linenum++)
+ {
+ tt = VIS_CHARS (linenum);
+ _rl_move_vert (linenum);
+ _rl_move_cursor_relative (0, tt, VIS_FACE(linenum));
+ _rl_clear_to_eol
+ ((linenum == _rl_vis_botlin) ? strlen (tt) : _rl_screenwidth);
+ }
+ }
+ _rl_vis_botlin = inv_botlin;
+
+ /* CHANGED_SCREEN_LINE is set to 1 if we have moved to a
+ different screen line during this redisplay. */
+ changed_screen_line = _rl_last_v_pos != cursor_linenum;
+ if (changed_screen_line)
+ {
+ _rl_move_vert (cursor_linenum);
+ /* If we moved up to the line with the prompt using _rl_term_up,
+ the physical cursor position on the screen stays the same,
+ but the buffer position needs to be adjusted to account
+ for invisible characters. */
+ if ((mb_cur_max == 1 || rl_byte_oriented) && cursor_linenum == 0 && wrap_offset)
+ _rl_last_c_pos += wrap_offset;
+ }
+
+ /* Now we move the cursor to where it needs to be. First, make
+ sure we are on the correct line (cursor_linenum). */
+
+ /* We have to reprint the prompt if it contains invisible
+ characters, since it's not generally OK to just reprint
+ the characters from the current cursor position. But we
+ only need to reprint it if the cursor is before the last
+ invisible character in the prompt string. */
+ /* XXX - why not use local_prompt_len? */
+ nleft = prompt_visible_length + wrap_offset;
+ if (cursor_linenum == 0 && wrap_offset > 0 && _rl_last_c_pos > 0 &&
+ _rl_last_c_pos < PROMPT_ENDING_INDEX && local_prompt)
+ {
+ _rl_cr ();
+ if (modmark)
+ _rl_output_some_chars ("*", 1);
+
+ _rl_output_some_chars (local_prompt, nleft);
+ if (mb_cur_max > 1 && rl_byte_oriented == 0)
+ _rl_last_c_pos = _rl_col_width (local_prompt, 0, nleft, 1) - wrap_offset + modmark;
+ else
+ _rl_last_c_pos = nleft + modmark;
+ }
+
+ /* Where on that line? And where does that line start
+ in the buffer? */
+ pos = inv_lbreaks[cursor_linenum];
+ /* nleft == number of characters (bytes) in the line buffer between
+ the start of the line and the desired cursor position. */
+ nleft = cpos_buffer_position - pos;
+
+ /* NLEFT is now a number of characters in a buffer. When in a
+ multibyte locale, however, _rl_last_c_pos is an absolute cursor
+ position that doesn't take invisible characters in the prompt
+ into account. We use a fudge factor to compensate. */
+
+ /* Since _rl_backspace() doesn't know about invisible characters in
+ the prompt, and there's no good way to tell it, we compensate for
+ those characters here and call _rl_backspace() directly if
+ necessary */
+ if (wrap_offset && cursor_linenum == 0 && nleft < _rl_last_c_pos)
+ {
+ /* TX == new physical cursor position in multibyte locale. */
+ if (mb_cur_max > 1 && rl_byte_oriented == 0)
+ tx = _rl_col_width (&visible_line[pos], 0, nleft, 1) - visible_wrap_offset;
+ else
+ tx = nleft;
+ if (tx >= 0 && _rl_last_c_pos > tx)
+ {
+ _rl_backspace (_rl_last_c_pos - tx); /* XXX */
+ _rl_last_c_pos = tx;
+ }
+ }
+
+ /* We need to note that in a multibyte locale we are dealing with
+ _rl_last_c_pos as an absolute cursor position, but moving to a
+ point specified by a buffer position (NLEFT) that doesn't take
+ invisible characters into account. */
+ if (mb_cur_max > 1 && rl_byte_oriented == 0)
+ _rl_move_cursor_relative (nleft, &invisible_line[pos], &inv_face[pos]);
+ else if (nleft != _rl_last_c_pos)
+ _rl_move_cursor_relative (nleft, &invisible_line[pos], &inv_face[pos]);
+ }
+ }
+ else /* Do horizontal scrolling. Much simpler */
+ {
+#define M_OFFSET(margin, offset) ((margin) == 0 ? offset : 0)
+ int lmargin, ndisp, nleft, phys_c_pos, t;
+
+ /* Always at top line. */
+ _rl_last_v_pos = 0;
+
+ /* Compute where in the buffer the displayed line should start. This
+ will be LMARGIN. */
+
+ /* The number of characters that will be displayed before the cursor. */
+ ndisp = cpos_buffer_position - wrap_offset;
+ nleft = prompt_visible_length + wrap_offset;
+ /* Where the new cursor position will be on the screen. This can be
+ longer than SCREENWIDTH; if it is, lmargin will be adjusted. */
+ phys_c_pos = cpos_buffer_position - (last_lmargin ? last_lmargin : wrap_offset);
+ t = _rl_screenwidth / 3;
+
+ /* If the number of characters had already exceeded the screenwidth,
+ last_lmargin will be > 0. */
+
+ /* If the number of characters to be displayed is more than the screen
+ width, compute the starting offset so that the cursor is about
+ two-thirds of the way across the screen. */
+ if (phys_c_pos > _rl_screenwidth - 2)
+ {
+ lmargin = cpos_buffer_position - (2 * t);
+ if (lmargin < 0)
+ lmargin = 0;
+ /* If the left margin would be in the middle of a prompt with
+ invisible characters, don't display the prompt at all. */
+ if (wrap_offset && lmargin > 0 && lmargin < nleft)
+ lmargin = nleft;
+ }
+ else if (ndisp < _rl_screenwidth - 2) /* XXX - was -1 */
+ lmargin = 0;
+ else if (phys_c_pos < 1)
+ {
+ /* If we are moving back towards the beginning of the line and
+ the last margin is no longer correct, compute a new one. */
+ lmargin = ((cpos_buffer_position - 1) / t) * t; /* XXX */
+ if (wrap_offset && lmargin > 0 && lmargin < nleft)
+ lmargin = nleft;
+ }
+ else
+ lmargin = last_lmargin;
+
+ displaying_prompt_first_line = lmargin < nleft;
+
+ /* If the first character on the screen isn't the first character
+ in the display line, indicate this with a special character. */
+ if (lmargin > 0)
+ invisible_line[lmargin] = '<';
+
+ /* If SCREENWIDTH characters starting at LMARGIN do not encompass
+ the whole line, indicate that with a special character at the
+ right edge of the screen. If LMARGIN is 0, we need to take the
+ wrap offset into account. */
+ t = lmargin + M_OFFSET (lmargin, wrap_offset) + _rl_screenwidth;
+ if (t > 0 && t < out)
+ invisible_line[t - 1] = '>';
+
+ if (rl_display_fixed == 0 || forced_display || lmargin != last_lmargin)
+ {
+ forced_display = 0;
+ o_cpos = _rl_last_c_pos;
+ cpos_adjusted = 0;
+ update_line (&visible_line[last_lmargin], &vis_face[last_lmargin],
+ &invisible_line[lmargin], &inv_face[lmargin],
+ 0,
+ _rl_screenwidth + visible_wrap_offset,
+ _rl_screenwidth + (lmargin ? 0 : wrap_offset),
+ 0);
+
+ if ((mb_cur_max > 1 && rl_byte_oriented == 0) &&
+ displaying_prompt_first_line && OLD_CPOS_IN_PROMPT())
+ _rl_last_c_pos -= prompt_invis_chars_first_line; /* XXX - was wrap_offset */
+
+ /* If the visible new line is shorter than the old, but the number
+ of invisible characters is greater, and we are at the end of
+ the new line, we need to clear to eol. */
+ t = _rl_last_c_pos - M_OFFSET (lmargin, wrap_offset);
+ if ((M_OFFSET (lmargin, wrap_offset) > visible_wrap_offset) &&
+ (_rl_last_c_pos == out) && displaying_prompt_first_line &&
+ t < visible_first_line_len)
+ {
+ nleft = _rl_screenwidth - t;
+ _rl_clear_to_eol (nleft);
+ }
+ visible_first_line_len = out - lmargin - M_OFFSET (lmargin, wrap_offset);
+ if (visible_first_line_len > _rl_screenwidth)
+ visible_first_line_len = _rl_screenwidth;
+
+ _rl_move_cursor_relative (cpos_buffer_position - lmargin, &invisible_line[lmargin], &inv_face[lmargin]);
+ last_lmargin = lmargin;
+ }
+ }
+ fflush (rl_outstream);
+
+ /* Swap visible and non-visible lines. */
+ {
+ struct line_state *vtemp = line_state_visible;
+
+ line_state_visible = line_state_invisible;
+ line_state_invisible = vtemp;
+
+ rl_display_fixed = 0;
+ /* If we are displaying on a single line, and last_lmargin is > 0, we
+ are not displaying any invisible characters, so set visible_wrap_offset
+ to 0. */
+ if (_rl_horizontal_scroll_mode && last_lmargin)
+ visible_wrap_offset = 0;
+ else
+ visible_wrap_offset = wrap_offset;
+
+ _rl_quick_redisplay = 0;
+ }
+
+ RL_UNSETSTATE (RL_STATE_REDISPLAYING);
+ _rl_release_sigint ();
+}
+
+static void
+putc_face (int c, int face, char *cur_face)
+{
+ char cf;
+ cf = *cur_face;
+ if (cf != face)
+ {
+ if (cf != FACE_NORMAL && cf != FACE_STANDOUT)
+ return;
+ if (face != FACE_NORMAL && face != FACE_STANDOUT)
+ return;
+ if (face == FACE_STANDOUT && cf == FACE_NORMAL)
+ _rl_region_color_on ();
+ if (face == FACE_NORMAL && cf == FACE_STANDOUT)
+ _rl_region_color_off ();
+ *cur_face = face;
+ }
+ if (c != EOF)
+ putc (c, rl_outstream);
+}
+
+static void
+puts_face (const char *str, const char *face, int n)
+{
+ int i;
+ char cur_face;
+
+ for (cur_face = FACE_NORMAL, i = 0; i < n; i++)
+ putc_face ((unsigned char) str[i], face[i], &cur_face);
+ putc_face (EOF, FACE_NORMAL, &cur_face);
+}
+
+static void
+norm_face (char *face, int n)
+{
+ memset (face, FACE_NORMAL, n);
+}
+
+#define ADJUST_CPOS(x) do { _rl_last_c_pos -= (x) ; cpos_adjusted = 1; } while (0)
+
+/* 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 handled.
+
+ Could be made even smarter, but this works well enough */
+static void
+update_line (char *old, char *old_face, char *new, char *new_face, int current_line, int omax, int nmax, int inv_botlin)
+{
+ char *ofd, *ols, *oe, *nfd, *nls, *ne;
+ char *ofdf, *nfdf, *olsf, *nlsf;
+ int temp, lendiff, wsatend, od, nd, twidth, o_cpos;
+ int current_invis_chars;
+ int col_lendiff, col_temp;
+ int bytes_to_insert;
+ int mb_cur_max = MB_CUR_MAX;
+#if defined (HANDLE_MULTIBYTE)
+ mbstate_t ps_new, ps_old;
+ int new_offset, old_offset;
+#endif
+
+ /* If we're at the right edge of a terminal that supports xn, we're
+ ready to wrap around, so do so. This fixes problems with knowing
+ the exact cursor position and cut-and-paste with certain terminal
+ emulators. In this calculation, TEMP is the physical screen
+ position of the cursor. */
+ if (mb_cur_max > 1 && rl_byte_oriented == 0)
+ temp = _rl_last_c_pos;
+ else
+ temp = _rl_last_c_pos - WRAP_OFFSET (_rl_last_v_pos, visible_wrap_offset);
+ if (temp == _rl_screenwidth && _rl_term_autowrap && !_rl_horizontal_scroll_mode
+ && _rl_last_v_pos == current_line - 1)
+ {
+ /* We're going to wrap around by writing the first character of NEW to
+ the screen and dealing with changes to what's visible by modifying
+ OLD to match it. Complicated by the presence of multi-width
+ characters at the end of the line or beginning of the new one. */
+ /* old is always somewhere in visible_line; new is always somewhere in
+ invisible_line. These should always be null-terminated. */
+#if defined (HANDLE_MULTIBYTE)
+ if (mb_cur_max > 1 && rl_byte_oriented == 0)
+ {
+ WCHAR_T wc;
+ mbstate_t ps;
+ int oldwidth, newwidth;
+ int oldbytes, newbytes;
+ size_t ret;
+
+ /* This fixes only double-column characters, but if the wrapped
+ character consumes more than three columns, spaces will be
+ inserted in the string buffer. */
+ /* XXX remember that we are working on the invisible line right now;
+ we don't swap visible and invisible until just before rl_redisplay
+ returns */
+ /* This will remove the extra placeholder space we added with
+ _rl_wrapped_multicolumn */
+ if (current_line < line_state_invisible->wbsize && line_state_invisible->wrapped_line[current_line] > 0)
+ _rl_clear_to_eol (line_state_invisible->wrapped_line[current_line]);
+
+ /* 1. how many screen positions does first char in old consume? */
+ memset (&ps, 0, sizeof (mbstate_t));
+ ret = MBRTOWC (&wc, old, mb_cur_max, &ps);
+ oldbytes = ret;
+ if (MB_INVALIDCH (ret))
+ {
+ oldwidth = 1;
+ oldbytes = 1;
+ }
+ else if (MB_NULLWCH (ret))
+ oldwidth = 0;
+ else
+ oldwidth = WCWIDTH (wc);
+ if (oldwidth < 0)
+ oldwidth = 1;
+
+ /* 2. how many screen positions does the first char in new consume? */
+ memset (&ps, 0, sizeof (mbstate_t));
+ ret = MBRTOWC (&wc, new, mb_cur_max, &ps);
+ newbytes = ret;
+ if (MB_INVALIDCH (ret))
+ {
+ newwidth = 1;
+ newbytes = 1;
+ }
+ else if (MB_NULLWCH (ret))
+ newwidth = 0;
+ else
+ newwidth = WCWIDTH (wc);
+ if (newwidth < 0)
+ newwidth = 1;
+
+ /* 3. if the new width is less than the old width, we need to keep
+ going in new until we have consumed at least that many screen
+ positions, and figure out how many bytes that will take */
+ while (newbytes < nmax && newwidth < oldwidth)
+ {
+ int t;
+
+ ret = MBRTOWC (&wc, new+newbytes, mb_cur_max, &ps);
+ if (MB_INVALIDCH (ret))
+ {
+ newwidth += 1;
+ newbytes += 1;
+ }
+ else if (MB_NULLWCH (ret))
+ break;
+ else
+ {
+ t = WCWIDTH (wc);
+ newwidth += (t >= 0) ? t : 1;
+ newbytes += ret;
+ }
+ }
+ /* 4. If the new width is more than the old width, keep going in old
+ until we have consumed exactly that many screen positions, and
+ figure out how many bytes that will take. This is an optimization */
+ while (oldbytes < omax && oldwidth < newwidth)
+ {
+ int t;
+
+ ret = MBRTOWC (&wc, old+oldbytes, mb_cur_max, &ps);
+ if (MB_INVALIDCH (ret))
+ {
+ oldwidth += 1;
+ oldbytes += 1;
+ }
+ else if (MB_NULLWCH (ret))
+ break;
+ else
+ {
+ t = WCWIDTH (wc);
+ oldwidth += (t >= 0) ? t : 1;
+ oldbytes += ret;
+ }
+ }
+ /* 5. write the first newbytes of new, which takes newwidth. This is
+ where the screen wrapping takes place, and we are now writing
+ characters onto the new line. We need to fix up old so it
+ accurately reflects what is on the screen after the
+ _rl_output_some_chars below. */
+ if (newwidth > 0)
+ {
+ int count, i, j;
+ char *optr;
+
+ puts_face (new, new_face, newbytes);
+ _rl_last_c_pos = newwidth;
+ _rl_last_v_pos++;
+
+ /* 5a. If the number of screen positions doesn't match, punt
+ and do a dumb update.
+ 5b. If the number of bytes is greater in the new line than
+ the old, do a dumb update, because there is no guarantee we
+ can extend the old line enough to fit the new bytes. */
+ if (newwidth != oldwidth || newbytes > oldbytes)
+ {
+ oe = old + omax;
+ ne = new + nmax;
+ nd = newbytes;
+ nfd = new + nd;
+ ofdf = old_face + oldbytes;
+ nfdf = new_face + newbytes;
+
+ goto dumb_update;
+ }
+ if (oldbytes != 0 && newbytes != 0)
+ {
+ /* We have written as many bytes from new as we need to
+ consume the first character of old. Fix up `old' so it
+ reflects the new screen contents. We use +1 in the
+ memmove call to copy the trailing NUL. */
+ /* (strlen(old+oldbytes) == (omax - oldbytes - 1)) */
+
+ /* Don't bother trying to fit the bytes if the number of bytes
+ doesn't change. */
+ if (oldbytes != newbytes)
+ {
+ memmove (old+newbytes, old+oldbytes, strlen (old+oldbytes) + 1);
+ memmove (old_face+newbytes, old_face+oldbytes, strlen (old+oldbytes) + 1);
+ }
+ memcpy (old, new, newbytes);
+ memcpy (old_face, new_face, newbytes);
+ j = newbytes - oldbytes;
+ omax += j;
+ /* Fix up indices if we copy data from one line to another */
+ for (i = current_line+1; j != 0 && i <= inv_botlin+1 && i <=_rl_vis_botlin+1; i++)
+ vis_lbreaks[i] += j;
+ }
+ }
+ else
+ {
+ putc (' ', rl_outstream);
+ _rl_last_c_pos = 1;
+ _rl_last_v_pos++;
+ if (old[0] && new[0])
+ {
+ old[0] = new[0];
+ old_face[0] = new_face[0];
+ }
+ }
+ }
+ else
+#endif
+ {
+ if (new[0])
+ puts_face (new, new_face, 1);
+ else
+ putc (' ', rl_outstream);
+ _rl_last_c_pos = 1;
+ _rl_last_v_pos++;
+ if (old[0] && new[0])
+ {
+ old[0] = new[0];
+ old_face[0] = new_face[0];
+ }
+ }
+ }
+
+ /* We know that we are dealing with a single screen line here */
+ if (_rl_quick_redisplay)
+ {
+ nfd = new;
+ nfdf = new_face;
+ ofd = old;
+ ofdf = old_face;
+ for (od = 0, oe = ofd; od < omax && *oe; oe++, od++);
+ for (nd = 0, ne = nfd; nd < nmax && *ne; ne++, nd++);
+ od = nd = 0;
+ _rl_move_cursor_relative (0, old, old_face);
+
+ bytes_to_insert = ne - nfd;
+ if (bytes_to_insert < local_prompt_len) /* ??? */
+ goto dumb_update;
+
+ /* output the prompt, output the line contents, clear the rest */
+ _rl_output_some_chars (nfd, local_prompt_len);
+ if (mb_cur_max > 1 && rl_byte_oriented == 0)
+ _rl_last_c_pos = prompt_physical_chars;
+ else
+ _rl_last_c_pos = local_prompt_len;
+
+ bytes_to_insert -= local_prompt_len;
+ if (bytes_to_insert > 0)
+ {
+ puts_face (new+local_prompt_len, nfdf+local_prompt_len, bytes_to_insert);
+ if (mb_cur_max > 1 && rl_byte_oriented)
+ _rl_last_c_pos += _rl_col_width (new, local_prompt_len, ne-new, 1);
+ else
+ _rl_last_c_pos += bytes_to_insert;
+ }
+
+ /* See comments at dumb_update: for an explanation of this heuristic */
+ if (nmax < omax)
+ goto clear_rest_of_line;
+ else if ((nmax - W_OFFSET(current_line, wrap_offset)) < (omax - W_OFFSET (current_line, visible_wrap_offset)))
+ goto clear_rest_of_line;
+ else
+ return;
+ }
+
+ /* Find first difference. */
+#if defined (HANDLE_MULTIBYTE)
+ if (mb_cur_max > 1 && rl_byte_oriented == 0)
+ {
+ /* See if the old line is a subset of the new line, so that the
+ only change is adding characters. */
+ temp = (omax < nmax) ? omax : nmax;
+ if (memcmp (old, new, temp) == 0 && memcmp (old_face, new_face, temp) == 0)
+ {
+ new_offset = old_offset = temp; /* adding at the end */
+ ofd = old + temp;
+ ofdf = old_face + temp;
+ nfd = new + temp;
+ nfdf = new_face + temp;
+ }
+ else
+ {
+ memset (&ps_new, 0, sizeof(mbstate_t));
+ memset (&ps_old, 0, sizeof(mbstate_t));
+
+ /* Are the old and new lines the same? */
+ if (omax == nmax && memcmp (new, old, omax) == 0 && memcmp (new_face, old_face, omax) == 0)
+ {
+ old_offset = omax;
+ new_offset = nmax;
+ ofd = old + omax;
+ ofdf = old_face + omax;
+ nfd = new + nmax;
+ nfdf = new_face + nmax;
+ }
+ else
+ {
+ /* Go through the line from the beginning and find the first
+ difference. We assume that faces change at (possibly multi-
+ byte) character boundaries. */
+ new_offset = old_offset = 0;
+ for (ofd = old, ofdf = old_face, nfd = new, nfdf = new_face;
+ (ofd - old < omax) && *ofd &&
+ _rl_compare_chars(old, old_offset, &ps_old, new, new_offset, &ps_new) &&
+ *ofdf == *nfdf; )
+ {
+ old_offset = _rl_find_next_mbchar (old, old_offset, 1, MB_FIND_ANY);
+ new_offset = _rl_find_next_mbchar (new, new_offset, 1, MB_FIND_ANY);
+
+ ofd = old + old_offset;
+ ofdf = old_face + old_offset;
+ nfd = new + new_offset;
+ nfdf = new_face + new_offset;
+ }
+ }
+ }
+ }
+ else
+#endif
+ for (ofd = old, ofdf = old_face, nfd = new, nfdf = new_face;
+ (ofd - old < omax) && *ofd && (*ofd == *nfd) && (*ofdf == *nfdf);
+ ofd++, nfd++, ofdf++, nfdf++)
+ ;
+
+ /* Move to the end of the screen line. ND and OD are used to keep track
+ of the distance between ne and new and oe and old, respectively, to
+ move a subtraction out of each loop. */
+ for (od = ofd - old, oe = ofd; od < omax && *oe; oe++, od++);
+ for (nd = nfd - new, ne = nfd; nd < nmax && *ne; ne++, nd++);
+
+ /* If no difference, continue to next line. */
+ if (ofd == oe && nfd == ne)
+ return;
+
+#if defined (HANDLE_MULTIBYTE)
+ if (mb_cur_max > 1 && rl_byte_oriented == 0 && _rl_utf8locale)
+ {
+ WCHAR_T wc;
+ mbstate_t ps = { 0 };
+ int t;
+
+ /* If the first character in the difference is a zero-width character,
+ assume it's a combining character and back one up so the two base
+ characters no longer compare equivalently. */
+ t = MBRTOWC (&wc, ofd, mb_cur_max, &ps);
+ if (t > 0 && UNICODE_COMBINING_CHAR (wc) && WCWIDTH (wc) == 0)
+ {
+ old_offset = _rl_find_prev_mbchar (old, ofd - old, MB_FIND_ANY);
+ new_offset = _rl_find_prev_mbchar (new, nfd - new, MB_FIND_ANY);
+ ofd = old + old_offset; /* equal by definition */
+ ofdf = old_face + old_offset;
+ nfd = new + new_offset;
+ nfdf = new_face + new_offset;
+ }
+ }
+#endif
+
+ wsatend = 1; /* flag for trailing whitespace */
+
+#if defined (HANDLE_MULTIBYTE)
+ /* Find the last character that is the same between the two lines. This
+ bounds the region that needs to change. */
+ if (mb_cur_max > 1 && rl_byte_oriented == 0)
+ {
+ ols = old + _rl_find_prev_mbchar (old, oe - old, MB_FIND_ANY);
+ olsf = old_face + (ols - old);
+ nls = new + _rl_find_prev_mbchar (new, ne - new, MB_FIND_ANY);
+ nlsf = new_face + (nls - new);
+
+ while ((ols > ofd) && (nls > nfd))
+ {
+ memset (&ps_old, 0, sizeof (mbstate_t));
+ memset (&ps_new, 0, sizeof (mbstate_t));
+
+ if (_rl_compare_chars (old, ols - old, &ps_old, new, nls - new, &ps_new) == 0 ||
+ *olsf != *nlsf)
+ break;
+
+ if (*ols == ' ')
+ wsatend = 0;
+
+ ols = old + _rl_find_prev_mbchar (old, ols - old, MB_FIND_ANY);
+ olsf = old_face + (ols - old);
+ nls = new + _rl_find_prev_mbchar (new, nls - new, MB_FIND_ANY);
+ nlsf = new_face + (nls - new);
+ }
+ }
+ else
+ {
+#endif /* HANDLE_MULTIBYTE */
+ ols = oe - 1; /* find last same */
+ olsf = old_face + (ols - old);
+ nls = ne - 1;
+ nlsf = new_face + (nls - new);
+ while ((ols > ofd) && (nls > nfd) && (*ols == *nls) && (*olsf == *nlsf))
+ {
+ if (*ols != ' ')
+ wsatend = 0;
+ ols--; olsf--;
+ nls--; nlsf--;
+ }
+#if defined (HANDLE_MULTIBYTE)
+ }
+#endif
+
+ if (wsatend)
+ {
+ ols = oe;
+ olsf = old_face + (ols - old);
+ nls = ne;
+ nlsf = new_face + (nls - new);
+ }
+#if defined (HANDLE_MULTIBYTE)
+ /* This may not work for stateful encoding, but who cares? To handle
+ stateful encoding properly, we have to scan each string from the
+ beginning and compare. */
+ else if (_rl_compare_chars (ols, 0, NULL, nls, 0, NULL) == 0 || *olsf != *nlsf)
+#else
+ else if (*ols != *nls || *olsf != *nlsf)
+#endif
+ {
+ if (*ols) /* don't step past the NUL */
+ {
+ if (mb_cur_max > 1 && rl_byte_oriented == 0)
+ ols = old + _rl_find_next_mbchar (old, ols - old, 1, MB_FIND_ANY);
+ else
+ ols++;
+ }
+ if (*nls)
+ {
+ if (mb_cur_max > 1 && rl_byte_oriented == 0)
+ nls = new + _rl_find_next_mbchar (new, nls - new, 1, MB_FIND_ANY);
+ else
+ nls++;
+ }
+ olsf = old_face + (ols - old);
+ nlsf = new_face + (nls - new);
+ }
+
+ /* count of invisible characters in the current invisible line. */
+ current_invis_chars = W_OFFSET (current_line, wrap_offset);
+ if (_rl_last_v_pos != current_line)
+ {
+ _rl_move_vert (current_line);
+ /* We have moved up to a new screen line. This line may or may not have
+ invisible characters on it, but we do our best to recalculate
+ visible_wrap_offset based on what we know. */
+ if (current_line == 0)
+ visible_wrap_offset = prompt_invis_chars_first_line; /* XXX */
+#if 0 /* XXX - not yet */
+ else if (current_line == prompt_last_screen_line && wrap_offset > prompt_invis_chars_first_line)
+ visible_wrap_offset = wrap_offset - prompt_invis_chars_first_line
+#endif
+ if ((mb_cur_max == 1 || rl_byte_oriented) && current_line == 0 && visible_wrap_offset)
+ _rl_last_c_pos += visible_wrap_offset;
+ }
+
+ /* If this is the first line and there are invisible characters in the
+ prompt string, and the prompt string has not changed, and the current
+ cursor position is before the last invisible character in the prompt,
+ and the index of the character to move to is past the end of the prompt
+ string, then redraw the entire prompt string. We can only do this
+ reliably if the terminal supports a `cr' capability.
+
+ This can also happen if the prompt string has changed, and the first
+ difference in the line is in the middle of the prompt string, after a
+ sequence of invisible characters (worst case) and before the end of
+ the prompt. In this case, we have to redraw the entire prompt string
+ so that the entire sequence of invisible characters is drawn. We need
+ to handle the worst case, when the difference is after (or in the middle
+ of) a sequence of invisible characters that changes the text color and
+ before the sequence that restores the text color to normal. Then we have
+ to make sure that the lines still differ -- if they don't, we can
+ return immediately.
+
+ This is not an efficiency hack -- there is a problem with redrawing
+ portions of the prompt string if they contain terminal escape
+ sequences (like drawing the `unbold' sequence without a corresponding
+ `bold') that manifests itself on certain terminals. */
+
+ lendiff = local_prompt_len;
+ if (lendiff > nmax)
+ lendiff = nmax;
+ od = ofd - old; /* index of first difference in visible line */
+ nd = nfd - new; /* nd, od are buffer indexes */
+ if (current_line == 0 && !_rl_horizontal_scroll_mode &&
+ _rl_term_cr && lendiff > prompt_visible_length && _rl_last_c_pos > 0 &&
+ (((od > 0 || nd > 0) && (od <= prompt_last_invisible || nd <= prompt_last_invisible)) ||
+ ((od >= lendiff) && _rl_last_c_pos < PROMPT_ENDING_INDEX)))
+ {
+ _rl_cr ();
+ if (modmark)
+ _rl_output_some_chars ("*", 1);
+ _rl_output_some_chars (local_prompt, lendiff);
+ if (mb_cur_max > 1 && rl_byte_oriented == 0)
+ {
+ /* If we just output the entire prompt string we can take advantage
+ of knowing the number of physical characters in the prompt. If
+ the prompt wraps lines (lendiff clamped at nmax), we can't. */
+ if (lendiff == local_prompt_len)
+ _rl_last_c_pos = prompt_physical_chars + modmark;
+ else
+ /* We take wrap_offset into account here so we can pass correct
+ information to _rl_move_cursor_relative. */
+ _rl_last_c_pos = _rl_col_width (local_prompt, 0, lendiff, 1) - wrap_offset + modmark;
+ cpos_adjusted = 1;
+ }
+ else
+ _rl_last_c_pos = lendiff + modmark;
+
+ /* Now if we have printed the prompt string because the first difference
+ was within the prompt, see if we need to recompute where the lines
+ differ. Check whether where we are now is past the last place where
+ the old and new lines are the same and short-circuit now if we are. */
+ if ((od <= prompt_last_invisible || nd <= prompt_last_invisible) &&
+ omax == nmax &&
+ lendiff > (ols-old) && lendiff > (nls-new))
+ return;
+
+ /* XXX - we need to fix up our calculations if we are now past the
+ old ofd/nfd and the prompt length (or line length) has changed.
+ We punt on the problem and do a dumb update. We'd like to be able
+ to just output the prompt from the beginning of the line up to the
+ first difference, but you don't know the number of invisible
+ characters in that case.
+ This needs a lot of work to be efficient, but it usually doesn't matter. */
+ if ((od <= prompt_last_invisible || nd <= prompt_last_invisible))
+ {
+ nfd = new + lendiff; /* number of characters we output above */
+ nfdf = new_face + lendiff;
+ nd = lendiff;
+
+ /* Do a dumb update and return */
+dumb_update:
+ temp = ne - nfd;
+ if (temp > 0)
+ {
+ puts_face (nfd, nfdf, temp);
+ if (mb_cur_max > 1 && rl_byte_oriented == 0)
+ {
+ _rl_last_c_pos += _rl_col_width (new, nd, ne - new, 1);
+ /* Need to adjust here based on wrap_offset. Guess that if
+ this is the line containing the last line of the prompt
+ we need to adjust by
+ wrap_offset-prompt_invis_chars_first_line
+ on the assumption that this is the number of invisible
+ characters in the last line of the prompt. */
+ if (wrap_offset > prompt_invis_chars_first_line &&
+ current_line == prompt_last_screen_line &&
+ prompt_physical_chars > _rl_screenwidth &&
+ _rl_horizontal_scroll_mode == 0)
+ ADJUST_CPOS (wrap_offset - prompt_invis_chars_first_line);
+
+ /* If we just output a new line including the prompt, and
+ the prompt includes invisible characters, we need to
+ account for them in the _rl_last_c_pos calculation, since
+ _rl_col_width does not. This happens when other code does
+ a goto dumb_update; */
+ else if (current_line == 0 &&
+ nfd == new &&
+ prompt_invis_chars_first_line &&
+ local_prompt_len <= temp &&
+ wrap_offset >= prompt_invis_chars_first_line &&
+ _rl_horizontal_scroll_mode == 0)
+ ADJUST_CPOS (prompt_invis_chars_first_line);
+ }
+ else
+ _rl_last_c_pos += temp;
+ }
+ /* This is a useful heuristic, but what we really want is to clear
+ if the new number of visible screen characters is less than the
+ old number of visible screen characters. If the prompt has changed,
+ we don't really have enough information about the visible line to
+ know for sure, so we use another heuristic calclulation below. */
+ if (nmax < omax)
+ goto clear_rest_of_line; /* XXX */
+ else if ((nmax - W_OFFSET(current_line, wrap_offset)) < (omax - W_OFFSET (current_line, visible_wrap_offset)))
+ goto clear_rest_of_line;
+ else
+ return;
+ }
+ }
+
+ o_cpos = _rl_last_c_pos;
+
+ /* When this function returns, _rl_last_c_pos is correct, and an absolute
+ cursor position in multibyte mode, but a buffer index when not in a
+ multibyte locale. */
+ _rl_move_cursor_relative (od, old, old_face);
+
+#if defined (HANDLE_MULTIBYTE)
+ /* We need to indicate that the cursor position is correct in the presence of
+ invisible characters in the prompt string. Let's see if setting this when
+ we make sure we're at the end of the drawn prompt string works. */
+ if (current_line == 0 && mb_cur_max > 1 && rl_byte_oriented == 0 &&
+ (_rl_last_c_pos > 0 || o_cpos > 0) &&
+ _rl_last_c_pos == prompt_physical_chars)
+ cpos_adjusted = 1;
+#endif
+
+ /* if (len (new) > len (old))
+ lendiff == difference in buffer (bytes)
+ col_lendiff == difference on screen (columns)
+ When not using multibyte characters, these are equal */
+ lendiff = (nls - nfd) - (ols - ofd);
+ if (mb_cur_max > 1 && rl_byte_oriented == 0)
+ {
+ int newchars, newwidth, newind;
+ int oldchars, oldwidth, oldind;
+
+ newchars = nls - new;
+ oldchars = ols - old;
+
+ /* If we can do it, try to adjust nls and ols so that nls-new will
+ contain the entire new prompt string. That way we can use
+ prompt_physical_chars and not have to recompute column widths.
+ _rl_col_width adds wrap_offset and expects the caller to compensate,
+ which we do below, so we do the same thing if we don't call
+ _rl_col_width.
+ We don't have to compare, since we know the characters are the same.
+ The check of differing numbers of invisible chars may be extraneous.
+ XXX - experimental */
+ if (current_line == 0 && nfd == new && newchars > prompt_last_invisible &&
+ newchars <= local_prompt_len &&
+ local_prompt_len <= nmax &&
+ current_invis_chars != visible_wrap_offset)
+ {
+ while (newchars < nmax && oldchars < omax && newchars < local_prompt_len)
+ {
+#if defined (HANDLE_MULTIBYTE)
+ newind = _rl_find_next_mbchar (new, newchars, 1, MB_FIND_NONZERO);
+ oldind = _rl_find_next_mbchar (old, oldchars, 1, MB_FIND_NONZERO);
+
+ nls += newind - newchars;
+ ols += oldind - oldchars;
+
+ newchars = newind;
+ oldchars = oldind;
+#else
+ nls++; ols++;
+ newchars++; oldchars++;
+#endif
+ }
+ newwidth = (newchars == local_prompt_len) ? prompt_physical_chars + wrap_offset
+ : _rl_col_width (new, 0, nls - new, 1);
+ /* if we changed nls and ols, we need to recompute lendiff */
+ lendiff = (nls - nfd) - (ols - ofd);
+
+ nlsf = new_face + (nls - new);
+ olsf = old_face + (ols - old);
+ }
+ else
+ newwidth = _rl_col_width (new, nfd - new, nls - new, 1);
+
+ oldwidth = _rl_col_width (old, ofd - old, ols - old, 1);
+
+ col_lendiff = newwidth - oldwidth;
+ }
+ else
+ col_lendiff = lendiff;
+
+ /* col_lendiff uses _rl_col_width(), which doesn't know about whether or not
+ the multibyte characters it counts are invisible, so unless we're printing
+ the entire prompt string (in which case we can use prompt_physical_chars)
+ the count is short by the number of bytes in the invisible multibyte
+ characters - the number of multibyte characters.
+
+ We don't have a good way to solve this without moving to something like
+ a bitmap that indicates which characters are visible and which are
+ invisible. We fix it up (imperfectly) in the caller and by trying to use
+ the entire prompt string wherever we can. */
+
+ /* If we are changing the number of invisible characters in a line, and
+ the spot of first difference is before the end of the invisible chars,
+ lendiff needs to be adjusted. */
+ if (current_line == 0 && current_invis_chars != visible_wrap_offset)
+ {
+ if (mb_cur_max > 1 && rl_byte_oriented == 0)
+ {
+ lendiff += visible_wrap_offset - current_invis_chars;
+ col_lendiff += visible_wrap_offset - current_invis_chars;
+ }
+ else
+ {
+ lendiff += visible_wrap_offset - current_invis_chars;
+ col_lendiff = lendiff;
+ }
+ }
+
+ /* We use temp as a count of the number of bytes from the first difference
+ to the end of the new line. col_temp is the corresponding number of
+ screen columns. A `dumb' update moves to the spot of first difference
+ and writes TEMP bytes. */
+ /* Insert (diff (len (old), len (new)) ch. */
+ temp = ne - nfd;
+ if (mb_cur_max > 1 && rl_byte_oriented == 0)
+ col_temp = _rl_col_width (new, nfd - new, ne - new, 1);
+ else
+ col_temp = temp;
+
+ /* how many bytes from the new line buffer to write to the display */
+ bytes_to_insert = nls - nfd;
+
+ /* col_lendiff > 0 if we are adding characters to the line */
+ if (col_lendiff > 0) /* XXX - was lendiff */
+ {
+ /* Non-zero if we're increasing the number of lines. */
+ int gl = current_line >= _rl_vis_botlin && inv_botlin > _rl_vis_botlin;
+
+ /* If col_lendiff is > 0, implying that the new string takes up more
+ screen real estate than the old, but lendiff is < 0, meaning that it
+ takes fewer bytes, we need to just output the characters starting
+ from the first difference. These will overwrite what is on the
+ display, so there's no reason to do a smart update. This can really
+ only happen in a multibyte environment. */
+ if (lendiff < 0)
+ {
+ puts_face (nfd, nfdf, temp);
+ _rl_last_c_pos += col_temp;
+ /* If nfd begins before any invisible characters in the prompt,
+ adjust _rl_last_c_pos to account for wrap_offset and set
+ cpos_adjusted to let the caller know. */
+ if (current_line == 0 && displaying_prompt_first_line && wrap_offset && ((nfd - new) <= prompt_last_invisible))
+ ADJUST_CPOS (wrap_offset); /* XXX - prompt_invis_chars_first_line? */
+ return;
+ }
+ /* Sometimes it is cheaper to print the characters rather than
+ use the terminal's capabilities. If we're growing the number
+ of lines, make sure we actually cause the new line to wrap
+ around on auto-wrapping terminals. */
+ else if (_rl_terminal_can_insert && ((2 * col_temp) >= col_lendiff || _rl_term_IC) && (!_rl_term_autowrap || !gl))
+ {
+ /* If lendiff > prompt_visible_length and _rl_last_c_pos == 0 and
+ _rl_horizontal_scroll_mode == 1, inserting the characters with
+ _rl_term_IC or _rl_term_ic will screw up the screen because of the
+ invisible characters. We need to just draw them. */
+ /* The same thing happens if we're trying to draw before the last
+ invisible character in the prompt string or we're increasing the
+ number of invisible characters in the line and we're not drawing
+ the entire prompt string. */
+ if (*ols && ((_rl_horizontal_scroll_mode &&
+ _rl_last_c_pos == 0 &&
+ lendiff > prompt_visible_length &&
+ current_invis_chars > 0) == 0) &&
+ (((mb_cur_max > 1 && rl_byte_oriented == 0) &&
+ current_line == 0 && wrap_offset &&
+ ((nfd - new) <= prompt_last_invisible) &&
+ (col_lendiff < prompt_visible_length)) == 0) &&
+ (visible_wrap_offset >= current_invis_chars))
+ {
+ open_some_spaces (col_lendiff);
+ puts_face (nfd, nfdf, bytes_to_insert);
+ if (mb_cur_max > 1 && rl_byte_oriented == 0)
+ _rl_last_c_pos += _rl_col_width (nfd, 0, bytes_to_insert, 1);
+ else
+ _rl_last_c_pos += bytes_to_insert;
+ }
+ else if ((mb_cur_max == 1 || rl_byte_oriented != 0) && *ols == 0 && lendiff > 0)
+ {
+ /* At the end of a line the characters do not have to
+ be "inserted". They can just be placed on the screen. */
+ puts_face (nfd, nfdf, temp);
+ _rl_last_c_pos += col_temp;
+ return;
+ }
+ else /* just write from first difference to end of new line */
+ {
+ puts_face (nfd, nfdf, temp);
+ _rl_last_c_pos += col_temp;
+ /* If nfd begins before the last invisible character in the
+ prompt, adjust _rl_last_c_pos to account for wrap_offset
+ and set cpos_adjusted to let the caller know. */
+ if ((mb_cur_max > 1 && rl_byte_oriented == 0) && current_line == 0 && displaying_prompt_first_line && wrap_offset && ((nfd - new) <= prompt_last_invisible))
+ ADJUST_CPOS (wrap_offset); /* XXX - prompt_invis_chars_first_line? */
+ return;
+ }
+
+ if (bytes_to_insert > lendiff)
+ {
+ /* If nfd begins before the last invisible character in the
+ prompt, adjust _rl_last_c_pos to account for wrap_offset
+ and set cpos_adjusted to let the caller know. */
+ if ((mb_cur_max > 1 && rl_byte_oriented == 0) && current_line == 0 && displaying_prompt_first_line && wrap_offset && ((nfd - new) <= prompt_last_invisible))
+ ADJUST_CPOS (wrap_offset); /* XXX - prompt_invis_chars_first_line? */
+ }
+ }
+ else
+ {
+ /* cannot insert chars, write to EOL */
+ puts_face (nfd, nfdf, temp);
+ _rl_last_c_pos += col_temp;
+ /* If we're in a multibyte locale and were before the last invisible
+ char in the current line (which implies we just output some invisible
+ characters) we need to adjust _rl_last_c_pos, since it represents
+ a physical character position. */
+ /* The current_line*rl_screenwidth+prompt_invis_chars_first_line is a
+ crude attempt to compute how far into the new line buffer we are.
+ It doesn't work well in the face of multibyte characters and needs
+ to be rethought. XXX */
+ if ((mb_cur_max > 1 && rl_byte_oriented == 0) &&
+ current_line == prompt_last_screen_line && wrap_offset &&
+ displaying_prompt_first_line &&
+ wrap_offset != prompt_invis_chars_first_line &&
+ ((nfd-new) < (prompt_last_invisible-(current_line*_rl_screenwidth+prompt_invis_chars_first_line))))
+ ADJUST_CPOS (wrap_offset - prompt_invis_chars_first_line);
+
+ /* What happens if wrap_offset == prompt_invis_chars_first_line
+ and we are drawing the first line (current_line == 0), or if we
+ are drawing the first line and changing the number of invisible
+ characters in the line? If we're starting to draw before the last
+ invisible character in the prompt, we need to adjust by
+ _rl_last_c_pos -= prompt_invis_chars_first_line. This can happen
+ when we finish reading a digit argument (with the "(arg: N)"
+ prompt) and are switching back to displaying a line with a prompt
+ containing invisible characters, since we have to redraw the
+ entire prompt string. */
+ if ((mb_cur_max > 1 && rl_byte_oriented == 0) &&
+ current_line == 0 && wrap_offset &&
+ displaying_prompt_first_line &&
+ wrap_offset == prompt_invis_chars_first_line &&
+ visible_wrap_offset != current_invis_chars &&
+ visible_wrap_offset != prompt_invis_chars_first_line &&
+ ((nfd-new) < prompt_last_invisible))
+ ADJUST_CPOS (prompt_invis_chars_first_line);
+ }
+ }
+ else /* Delete characters from line. */
+ {
+ /* If possible and inexpensive to use terminal deletion, then do so. */
+ if (_rl_term_dc && (2 * col_temp) >= -col_lendiff)
+ {
+ /* If all we're doing is erasing the invisible characters in the
+ prompt string, don't bother. It screws up the assumptions
+ about what's on the screen. */
+ if (_rl_horizontal_scroll_mode && _rl_last_c_pos == 0 &&
+ displaying_prompt_first_line &&
+ -lendiff == visible_wrap_offset)
+ col_lendiff = 0;
+
+ /* If we have moved lmargin and we're shrinking the line, we've
+ already moved the cursor to the first character of the new line,
+ so deleting -col_lendiff characters will mess up the cursor
+ position calculation */
+ if (_rl_horizontal_scroll_mode && displaying_prompt_first_line == 0 &&
+ col_lendiff && _rl_last_c_pos < -col_lendiff)
+ col_lendiff = 0;
+
+ if (col_lendiff)
+ delete_chars (-col_lendiff); /* delete (diff) characters */
+
+ /* Copy (new) chars to screen from first diff to last match,
+ overwriting what is there. */
+ if (bytes_to_insert > 0)
+ {
+ /* If nfd begins at the prompt, or before the invisible
+ characters in the prompt, we need to adjust _rl_last_c_pos
+ in a multibyte locale to account for the wrap offset and
+ set cpos_adjusted accordingly. */
+ puts_face (nfd, nfdf, bytes_to_insert);
+ if (mb_cur_max > 1 && rl_byte_oriented == 0)
+ {
+ /* This still doesn't take into account whether or not the
+ characters that this counts are invisible. */
+ _rl_last_c_pos += _rl_col_width (nfd, 0, bytes_to_insert, 1);
+ if (current_line == 0 && wrap_offset &&
+ displaying_prompt_first_line &&
+ prompt_invis_chars_first_line &&
+ _rl_last_c_pos >= prompt_invis_chars_first_line &&
+ ((nfd - new) <= prompt_last_invisible))
+ ADJUST_CPOS (prompt_invis_chars_first_line);
+
+#if 1
+#ifdef HANDLE_MULTIBYTE
+ /* If we write a non-space into the last screen column,
+ remove the note that we added a space to compensate for
+ a multibyte double-width character that didn't fit, since
+ it's only valid for what was previously there. */
+ /* XXX - watch this */
+ if (_rl_last_c_pos == _rl_screenwidth &&
+ line_state_invisible->wrapped_line[current_line+1] &&
+ nfd[bytes_to_insert-1] != ' ')
+ line_state_invisible->wrapped_line[current_line+1] = 0;
+#endif
+#endif
+ }
+ else
+ _rl_last_c_pos += bytes_to_insert;
+
+ /* XXX - we only want to do this if we are at the end of the line
+ so we move there with _rl_move_cursor_relative */
+ if (_rl_horizontal_scroll_mode && ((oe-old) > (ne-new)))
+ {
+ _rl_move_cursor_relative (ne-new, new, new_face);
+ goto clear_rest_of_line;
+ }
+ }
+ }
+ /* Otherwise, print over the existing material. */
+ else
+ {
+ if (temp > 0)
+ {
+ /* If nfd begins at the prompt, or before the invisible
+ characters in the prompt, we need to adjust _rl_last_c_pos
+ in a multibyte locale to account for the wrap offset and
+ set cpos_adjusted accordingly. */
+ puts_face (nfd, nfdf, temp);
+ _rl_last_c_pos += col_temp; /* XXX */
+ if (mb_cur_max > 1 && rl_byte_oriented == 0)
+ {
+ if (current_line == 0 && wrap_offset &&
+ displaying_prompt_first_line &&
+ _rl_last_c_pos > wrap_offset &&
+ ((nfd - new) <= prompt_last_invisible))
+ ADJUST_CPOS (wrap_offset); /* XXX - prompt_invis_chars_first_line? */
+ }
+ }
+clear_rest_of_line:
+ lendiff = (oe - old) - (ne - new);
+ if (mb_cur_max > 1 && rl_byte_oriented == 0)
+ col_lendiff = _rl_col_width (old, 0, oe - old, 1) - _rl_col_width (new, 0, ne - new, 1);
+ else
+ col_lendiff = lendiff;
+
+ /* If we've already printed over the entire width of the screen,
+ including the old material, then col_lendiff doesn't matter and
+ space_to_eol will insert too many spaces. XXX - maybe we should
+ adjust col_lendiff based on the difference between _rl_last_c_pos
+ and _rl_screenwidth */
+ if (col_lendiff && ((mb_cur_max == 1 || rl_byte_oriented) || (_rl_last_c_pos < _rl_screenwidth)))
+ {
+ if (_rl_term_autowrap && current_line < inv_botlin)
+ space_to_eol (col_lendiff);
+ else
+ _rl_clear_to_eol (col_lendiff);
+ }
+ }
+ }
+}
+
+/* Tell the update routines that we have moved onto a new (empty) line. */
+int
+rl_on_new_line (void)
+{
+ if (visible_line)
+ visible_line[0] = '\0';
+
+ _rl_last_c_pos = _rl_last_v_pos = 0;
+ _rl_vis_botlin = last_lmargin = 0;
+ if (vis_lbreaks)
+ vis_lbreaks[0] = vis_lbreaks[1] = 0;
+ visible_wrap_offset = 0;
+ return 0;
+}
+
+/* Clear all screen lines occupied by the current readline line buffer
+ (visible line) */
+int
+rl_clear_visible_line (void)
+{
+ int curr_line;
+
+ /* Make sure we move to column 0 so we clear the entire line */
+ _rl_cr ();
+ _rl_last_c_pos = 0;
+
+ /* Move to the last screen line of the current visible line */
+ _rl_move_vert (_rl_vis_botlin);
+
+ /* And erase screen lines going up to line 0 (first visible line) */
+ for (curr_line = _rl_last_v_pos; curr_line >= 0; curr_line--)
+ {
+ _rl_move_vert (curr_line);
+ _rl_clear_to_eol (_rl_screenwidth);
+ _rl_cr (); /* in case we use space_to_eol() */
+ }
+
+ return 0;
+}
+
+/* Tell the update routines that we have moved onto a new line with the
+ prompt already displayed. Code originally from the version of readline
+ distributed with CLISP. rl_expand_prompt must have already been called
+ (explicitly or implicitly). This still doesn't work exactly right; it
+ should use expand_prompt() */
+int
+rl_on_new_line_with_prompt (void)
+{
+ int prompt_size, i, l, real_screenwidth, newlines;
+ char *prompt_last_line, *lprompt;
+
+ /* Initialize visible_line and invisible_line to ensure that they can hold
+ the already-displayed prompt. */
+ prompt_size = strlen (rl_prompt) + 1;
+ init_line_structures (prompt_size);
+
+ /* Make sure the line structures hold the already-displayed prompt for
+ redisplay. */
+ lprompt = local_prompt ? local_prompt : rl_prompt;
+ strcpy (visible_line, lprompt);
+ strcpy (invisible_line, lprompt);
+
+ /* If the prompt contains newlines, take the last tail. */
+ prompt_last_line = strrchr (rl_prompt, '\n');
+ if (!prompt_last_line)
+ prompt_last_line = rl_prompt;
+
+ l = strlen (prompt_last_line);
+ if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
+ _rl_last_c_pos = _rl_col_width (prompt_last_line, 0, l, 1); /* XXX */
+ else
+ _rl_last_c_pos = l;
+
+ /* Dissect prompt_last_line into screen lines. Note that here we have
+ to use the real screenwidth. Readline's notion of screenwidth might be
+ one less, see terminal.c. */
+ real_screenwidth = _rl_screenwidth + (_rl_term_autowrap ? 0 : 1);
+ _rl_last_v_pos = l / real_screenwidth;
+ /* If the prompt length is a multiple of real_screenwidth, we don't know
+ whether the cursor is at the end of the last line, or already at the
+ beginning of the next line. Output a newline just to be safe. */
+ if (l > 0 && (l % real_screenwidth) == 0)
+ _rl_output_some_chars ("\n", 1);
+ last_lmargin = 0;
+
+ newlines = 0; i = 0;
+ while (i <= l)
+ {
+ _rl_vis_botlin = newlines;
+ vis_lbreaks[newlines++] = i;
+ i += real_screenwidth;
+ }
+ vis_lbreaks[newlines] = l;
+ visible_wrap_offset = 0;
+
+ rl_display_prompt = rl_prompt; /* XXX - make sure it's set */
+
+ return 0;
+}
+
+/* Actually update the display, period. */
+int
+rl_forced_update_display (void)
+{
+ register char *temp;
+
+ if (visible_line)
+ {
+ temp = visible_line;
+ while (*temp)
+ *temp++ = '\0';
+ }
+ rl_on_new_line ();
+ forced_display++;
+ (*rl_redisplay_function) ();
+ return 0;
+}
+
+/* Redraw only the last line of a multi-line prompt. */
+void
+rl_redraw_prompt_last_line (void)
+{
+ char *t;
+
+ t = strrchr (rl_display_prompt, '\n');
+ if (t)
+ redraw_prompt (++t);
+ else
+ rl_forced_update_display ();
+}
+
+/* Move the cursor from _rl_last_c_pos to NEW, which are buffer indices.
+ (Well, when we don't have multibyte characters, _rl_last_c_pos is a
+ buffer index.)
+ DATA is the contents of the screen line of interest; i.e., where
+ the movement is being done.
+ DATA is always the visible line or the invisible line */
+static void
+_rl_move_cursor_relative (int new, const char *data, const char *dataf)
+{
+ register int i;
+ int woff; /* number of invisible chars on current line */
+ int cpos, dpos; /* current and desired cursor positions */
+ int adjust;
+ int in_invisline;
+ int mb_cur_max = MB_CUR_MAX;
+
+ woff = WRAP_OFFSET (_rl_last_v_pos, wrap_offset);
+ cpos = _rl_last_c_pos;
+
+ if (cpos == 0 && cpos == new)
+ return;
+
+#if defined (HANDLE_MULTIBYTE)
+ /* If we have multibyte characters, NEW is indexed by the buffer point in
+ a multibyte string, but _rl_last_c_pos is the display position. In
+ this case, NEW's display position is not obvious and must be
+ calculated. We need to account for invisible characters in this line,
+ as long as we are past them and they are counted by _rl_col_width. */
+ if (mb_cur_max > 1 && rl_byte_oriented == 0)
+ {
+ adjust = 1;
+ /* Try to short-circuit common cases and eliminate a bunch of multibyte
+ character function calls. */
+ /* 1. prompt string */
+ if (new == local_prompt_len && memcmp (data, local_prompt, new) == 0)
+ {
+ dpos = prompt_physical_chars;
+ cpos_adjusted = 1;
+ adjust = 0;
+ }
+ /* 2. prompt_string + line contents */
+ else if (new > local_prompt_len && local_prompt && memcmp (data, local_prompt, local_prompt_len) == 0)
+ {
+ dpos = prompt_physical_chars + _rl_col_width (data, local_prompt_len, new, 1);
+ cpos_adjusted = 1;
+ adjust = 0;
+ }
+ else
+ dpos = _rl_col_width (data, 0, new, 1);
+
+ if (displaying_prompt_first_line == 0)
+ adjust = 0;
+
+ /* yet another special case: printing the last line of a prompt with
+ multibyte characters and invisible characters whose printable length
+ exceeds the screen width with the last invisible character
+ (prompt_last_invisible) in the last line. IN_INVISLINE is the
+ offset of DATA in invisible_line */
+ in_invisline = 0;
+ if (data > invisible_line && data < invisible_line+inv_lbreaks[_rl_inv_botlin+1])
+ in_invisline = data - invisible_line;
+
+ /* Use NEW when comparing against the last invisible character in the
+ prompt string, since they're both buffer indices and DPOS is a
+ desired display position. */
+ /* NEW is relative to the current displayed line, while
+ PROMPT_LAST_INVISIBLE is relative to the entire (wrapped) line.
+ Need a way to reconcile these two variables by turning NEW into a
+ buffer position relative to the start of the line */
+ if (adjust && ((new > prompt_last_invisible) || /* XXX - don't use woff here */
+ (new+in_invisline > prompt_last_invisible) || /* invisible line */
+ (prompt_physical_chars >= _rl_screenwidth && /* visible line */
+ _rl_last_v_pos == prompt_last_screen_line &&
+ wrap_offset >= woff && dpos >= woff &&
+ new > (prompt_last_invisible-(vis_lbreaks[_rl_last_v_pos])-wrap_offset))))
+ /* XXX last comparison might need to be >= */
+ {
+ dpos -= woff;
+ /* Since this will be assigned to _rl_last_c_pos at the end (more
+ precisely, _rl_last_c_pos == dpos when this function returns),
+ let the caller know. */
+ cpos_adjusted = 1;
+ }
+ }
+ else
+#endif
+ dpos = new;
+
+ /* If we don't have to do anything, then return. */
+ if (cpos == dpos)
+ return;
+
+ /* It may be faster to output a CR, and then move forwards instead
+ of moving backwards. */
+ /* i == current physical cursor position. */
+#if defined (HANDLE_MULTIBYTE)
+ if (mb_cur_max > 1 && rl_byte_oriented == 0)
+ i = _rl_last_c_pos;
+ else
+#endif
+ i = _rl_last_c_pos - woff;
+ if (dpos == 0 || CR_FASTER (dpos, _rl_last_c_pos) ||
+ (_rl_term_autowrap && i == _rl_screenwidth))
+ {
+ _rl_cr ();
+ cpos = _rl_last_c_pos = 0;
+ }
+
+ if (cpos < dpos)
+ {
+ /* 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. */
+
+ /* However, we need a handle on where the current display position is
+ in the buffer for the immediately preceding comment to be true.
+ In multibyte locales, we don't currently have that info available.
+ Without it, we don't know where the data we have to display begins
+ in the buffer and we have to go back to the beginning of the screen
+ line. In this case, we can use the terminal sequence to move forward
+ if it's available. */
+ if (mb_cur_max > 1 && rl_byte_oriented == 0)
+ {
+ if (_rl_term_forward_char)
+ {
+ for (i = cpos; i < dpos; i++)
+ tputs (_rl_term_forward_char, 1, _rl_output_character_function);
+ }
+ else
+ {
+ _rl_cr ();
+ puts_face (data, dataf, new);
+ }
+ }
+ else
+ puts_face (data + cpos, dataf + cpos, new - cpos);
+ }
+
+#if defined (HANDLE_MULTIBYTE)
+ /* NEW points to the buffer point, but _rl_last_c_pos is the display point.
+ The byte length of the string is probably bigger than the column width
+ of the string, which means that if NEW == _rl_last_c_pos, then NEW's
+ display point is less than _rl_last_c_pos. */
+#endif
+ else if (cpos > dpos)
+ _rl_backspace (cpos - dpos);
+
+ _rl_last_c_pos = dpos;
+}
+
+/* PWP: move the cursor up or down. */
+void
+_rl_move_vert (int to)
+{
+ register int delta, i;
+
+ if (_rl_last_v_pos == to || to > _rl_screenheight)
+ return;
+
+ if ((delta = to - _rl_last_v_pos) > 0)
+ {
+ for (i = 0; i < delta; i++)
+ putc ('\n', rl_outstream);
+ _rl_cr ();
+ _rl_last_c_pos = 0;
+ }
+ else
+ { /* delta < 0 */
+#ifdef __DJGPP__
+ int row, col;
+
+ fflush (rl_outstream);
+ ScreenGetCursor (&row, &col);
+ ScreenSetCursor (row + delta, col);
+ i = -delta;
+#else
+ if (_rl_term_up && *_rl_term_up)
+ for (i = 0; i < -delta; i++)
+ tputs (_rl_term_up, 1, _rl_output_character_function);
+#endif /* !__DJGPP__ */
+ }
+
+ _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. */
+int
+rl_show_char (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 ((CTRL_CHAR (c) && c != '\t') || c == RUBOUT)
+#else
+ if (CTRL_CHAR (c) || c == RUBOUT)
+#endif /* !DISPLAY_TABS */
+ {
+ fprintf (rl_outstream, "C-");
+ n += 2;
+ c = CTRL_CHAR (c) ? UNCTRL (c) : '?';
+ }
+
+ putc (c, rl_outstream);
+ fflush (rl_outstream);
+ return n;
+}
+
+int
+rl_character_len (int c, int pos)
+{
+ unsigned char uc;
+
+ uc = (unsigned char)c;
+
+ if (META_CHAR (uc))
+ return ((_rl_output_meta_chars == 0) ? 4 : 1);
+
+ if (uc == '\t')
+ {
+#if defined (DISPLAY_TABS)
+ return (((pos | 7) + 1) - pos);
+#else
+ return (2);
+#endif /* !DISPLAY_TABS */
+ }
+
+ if (CTRL_CHAR (c) || c == RUBOUT)
+ return (2);
+
+ return ((ISPRINT (uc)) ? 1 : 2);
+}
+/* How to print things in the "echo-area". The prompt is treated as a
+ mini-modeline. */
+static int msg_saved_prompt = 0;
+
+#if defined (USE_VARARGS)
+int
+#if defined (PREFER_STDARG)
+rl_message (const char *format, ...)
+#else
+rl_message (va_alist)
+ va_dcl
+#endif
+{
+ va_list args;
+#if defined (PREFER_VARARGS)
+ char *format;
+#endif
+#if defined (HAVE_VSNPRINTF)
+ int bneed;
+#endif
+
+#if defined (PREFER_STDARG)
+ va_start (args, format);
+#else
+ va_start (args);
+ format = va_arg (args, char *);
+#endif
+
+ if (msg_buf == 0)
+ msg_buf = xmalloc (msg_bufsiz = 128);
+
+#if defined (HAVE_VSNPRINTF)
+ bneed = vsnprintf (msg_buf, msg_bufsiz, format, args);
+ if (bneed >= msg_bufsiz - 1)
+ {
+ msg_bufsiz = bneed + 1;
+ msg_buf = xrealloc (msg_buf, msg_bufsiz);
+ va_end (args);
+
+#if defined (PREFER_STDARG)
+ va_start (args, format);
+#else
+ va_start (args);
+ format = va_arg (args, char *);
+#endif
+ vsnprintf (msg_buf, msg_bufsiz - 1, format, args);
+ }
+#else
+ vsprintf (msg_buf, format, args);
+ msg_buf[msg_bufsiz - 1] = '\0'; /* overflow? */
+#endif
+ va_end (args);
+
+ if (saved_local_prompt == 0)
+ {
+ rl_save_prompt ();
+ msg_saved_prompt = 1;
+ }
+ else if (local_prompt != saved_local_prompt)
+ {
+ FREE (local_prompt);
+ FREE (local_prompt_prefix);
+ local_prompt = (char *)NULL;
+ }
+ rl_display_prompt = msg_buf;
+ local_prompt = expand_prompt (msg_buf, 0, &prompt_visible_length,
+ &prompt_last_invisible,
+ &prompt_invis_chars_first_line,
+ &prompt_physical_chars);
+ local_prompt_prefix = (char *)NULL;
+ local_prompt_len = local_prompt ? strlen (local_prompt) : 0;
+ (*rl_redisplay_function) ();
+
+ return 0;
+}
+#else /* !USE_VARARGS */
+int
+rl_message (format, arg1, arg2)
+ char *format;
+{
+ if (msg_buf == 0)
+ msg_buf = xmalloc (msg_bufsiz = 128);
+
+ sprintf (msg_buf, format, arg1, arg2);
+ msg_buf[msg_bufsiz - 1] = '\0'; /* overflow? */
+
+ rl_display_prompt = msg_buf;
+ if (saved_local_prompt == 0)
+ {
+ rl_save_prompt ();
+ msg_saved_prompt = 1;
+ }
+ else if (local_prompt != saved_local_prompt)
+ {
+ FREE (local_prompt);
+ FREE (local_prompt_prefix);
+ local_prompt = (char *)NULL;
+ }
+ local_prompt = expand_prompt (msg_buf, 0, &prompt_visible_length,
+ &prompt_last_invisible,
+ &prompt_invis_chars_first_line,
+ &prompt_physical_chars);
+ local_prompt_prefix = (char *)NULL;
+ local_prompt_len = local_prompt ? strlen (local_prompt) : 0;
+ (*rl_redisplay_function) ();
+
+ return 0;
+}
+#endif /* !USE_VARARGS */
+
+/* How to clear things from the "echo-area". */
+int
+rl_clear_message (void)
+{
+ rl_display_prompt = rl_prompt;
+ if (msg_saved_prompt)
+ {
+ rl_restore_prompt ();
+ msg_saved_prompt = 0;
+ }
+ (*rl_redisplay_function) ();
+ return 0;
+}
+
+int
+rl_reset_line_state (void)
+{
+ rl_on_new_line ();
+
+ rl_display_prompt = rl_prompt ? rl_prompt : "";
+ forced_display = 1;
+ return 0;
+}
+
+/* Save all of the variables associated with the prompt and its display. Most
+ of the complexity is dealing with the invisible characters in the prompt
+ string and where they are. There are enough of these that I should consider
+ a struct. */
+void
+rl_save_prompt (void)
+{
+ saved_local_prompt = local_prompt;
+ saved_local_prefix = local_prompt_prefix;
+ saved_prefix_length = prompt_prefix_length;
+ saved_local_length = local_prompt_len;
+ saved_last_invisible = prompt_last_invisible;
+ saved_visible_length = prompt_visible_length;
+ saved_invis_chars_first_line = prompt_invis_chars_first_line;
+ saved_physical_chars = prompt_physical_chars;
+ saved_local_prompt_newlines = local_prompt_newlines;
+
+ local_prompt = local_prompt_prefix = (char *)0;
+ local_prompt_len = 0;
+ local_prompt_newlines = (int *)0;
+
+ prompt_last_invisible = prompt_visible_length = prompt_prefix_length = 0;
+ prompt_invis_chars_first_line = prompt_physical_chars = 0;
+}
+
+void
+rl_restore_prompt (void)
+{
+ FREE (local_prompt);
+ FREE (local_prompt_prefix);
+ FREE (local_prompt_newlines);
+
+ local_prompt = saved_local_prompt;
+ local_prompt_prefix = saved_local_prefix;
+ local_prompt_len = saved_local_length;
+ local_prompt_newlines = saved_local_prompt_newlines;
+
+ prompt_prefix_length = saved_prefix_length;
+ prompt_last_invisible = saved_last_invisible;
+ prompt_visible_length = saved_visible_length;
+ prompt_invis_chars_first_line = saved_invis_chars_first_line;
+ prompt_physical_chars = saved_physical_chars;
+
+ /* can test saved_local_prompt to see if prompt info has been saved. */
+ saved_local_prompt = saved_local_prefix = (char *)0;
+ saved_local_length = 0;
+ saved_last_invisible = saved_visible_length = saved_prefix_length = 0;
+ saved_invis_chars_first_line = saved_physical_chars = 0;
+ saved_local_prompt_newlines = 0;
+}
+
+char *
+_rl_make_prompt_for_search (int pchar)
+{
+ int len;
+ char *pmt, *p;
+
+ rl_save_prompt ();
+
+ /* We've saved the prompt, and can do anything with the various prompt
+ strings we need before they're restored. We want the unexpanded
+ portion of the prompt string after any final newline. */
+ p = rl_prompt ? strrchr (rl_prompt, '\n') : 0;
+ if (p == 0)
+ {
+ len = (rl_prompt && *rl_prompt) ? strlen (rl_prompt) : 0;
+ pmt = (char *)xmalloc (len + 2);
+ if (len)
+ strcpy (pmt, rl_prompt);
+ pmt[len] = pchar;
+ pmt[len+1] = '\0';
+ }
+ else
+ {
+ p++;
+ len = strlen (p);
+ pmt = (char *)xmalloc (len + 2);
+ if (len)
+ strcpy (pmt, p);
+ pmt[len] = pchar;
+ pmt[len+1] = '\0';
+ }
+
+ /* will be overwritten by expand_prompt, called from rl_message */
+ prompt_physical_chars = saved_physical_chars + 1;
+ return pmt;
+}
+
+/* Quick redisplay hack when erasing characters at the end of the line. */
+void
+_rl_erase_at_end_of_line (int l)
+{
+ register int i;
+
+ _rl_backspace (l);
+ for (i = 0; i < l; i++)
+ putc (' ', rl_outstream);
+ _rl_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, but we use a terminal escape
+ sequence if available. */
+void
+_rl_clear_to_eol (int count)
+{
+#ifndef __MSDOS__
+ if (_rl_term_clreol)
+ tputs (_rl_term_clreol, 1, _rl_output_character_function);
+ else
+#endif
+ if (count)
+ space_to_eol (count);
+}
+
+/* Clear to the end of the line using spaces. COUNT is the minimum
+ number of character spaces to clear, */
+static void
+space_to_eol (int count)
+{
+ register int i;
+
+ for (i = 0; i < count; i++)
+ putc (' ', rl_outstream);
+
+ _rl_last_c_pos += count;
+}
+
+void
+_rl_clear_screen (int clrscr)
+{
+#if defined (__DJGPP__)
+ ScreenClear ();
+ ScreenSetCursor (0, 0);
+#else
+ if (_rl_term_clrpag)
+ {
+ tputs (_rl_term_clrpag, 1, _rl_output_character_function);
+ if (clrscr && _rl_term_clrscroll)
+ tputs (_rl_term_clrscroll, 1, _rl_output_character_function);
+ }
+ else
+ rl_crlf ();
+#endif /* __DJGPP__ */
+}
+
+/* Insert COUNT characters from STRING to the output stream at column COL. */
+static void
+insert_some_chars (char *string, int count, int col)
+{
+ open_some_spaces (col);
+ _rl_output_some_chars (string, count);
+}
+
+/* Insert COL spaces, keeping the cursor at the same position. We follow the
+ ncurses documentation and use either im/ei with explicit spaces, or IC/ic
+ by itself. We assume there will either be ei or we don't need to use it. */
+static void
+open_some_spaces (int col)
+{
+#if !defined (__MSDOS__) && (!defined (__MINGW32__) || defined (NCURSES_VERSION))
+ char *buffer;
+ register int i;
+
+ /* If IC is defined, then we do not have to "enter" insert mode. */
+ if (_rl_term_IC)
+ {
+ buffer = tgoto (_rl_term_IC, 0, col);
+ tputs (buffer, 1, _rl_output_character_function);
+ }
+ else if (_rl_term_im && *_rl_term_im)
+ {
+ tputs (_rl_term_im, 1, _rl_output_character_function);
+ /* just output the desired number of spaces */
+ for (i = col; i--; )
+ _rl_output_character_function (' ');
+ /* If there is a string to turn off insert mode, use it now. */
+ if (_rl_term_ei && *_rl_term_ei)
+ tputs (_rl_term_ei, 1, _rl_output_character_function);
+ /* and move back the right number of spaces */
+ _rl_backspace (col);
+ }
+ else if (_rl_term_ic && *_rl_term_ic)
+ {
+ /* If there is a special command for inserting characters, then
+ use that first to open up the space. */
+ for (i = col; i--; )
+ tputs (_rl_term_ic, 1, _rl_output_character_function);
+ }
+#endif /* !__MSDOS__ && (!__MINGW32__ || NCURSES_VERSION)*/
+}
+
+/* Delete COUNT characters from the display line. */
+static void
+delete_chars (int count)
+{
+ if (count > _rl_screenwidth) /* XXX */
+ return;
+
+#if !defined (__MSDOS__) && (!defined (__MINGW32__) || defined (NCURSES_VERSION))
+ if (_rl_term_DC && *_rl_term_DC)
+ {
+ char *buffer;
+ buffer = tgoto (_rl_term_DC, count, count);
+ tputs (buffer, count, _rl_output_character_function);
+ }
+ else
+ {
+ if (_rl_term_dc && *_rl_term_dc)
+ while (count--)
+ tputs (_rl_term_dc, 1, _rl_output_character_function);
+ }
+#endif /* !__MSDOS__ && (!__MINGW32__ || NCURSES_VERSION)*/
+}
+
+void
+_rl_update_final (void)
+{
+ int full_lines, woff, botline_length;
+
+ if (line_structures_initialized == 0)
+ return;
+
+ full_lines = 0;
+ /* If the cursor is the only thing on an otherwise-blank last line,
+ compensate so we don't print an extra CRLF. */
+ if (_rl_vis_botlin && _rl_last_c_pos == 0 &&
+ visible_line[vis_lbreaks[_rl_vis_botlin]] == 0)
+ {
+ _rl_vis_botlin--;
+ full_lines = 1;
+ }
+ _rl_move_vert (_rl_vis_botlin);
+ woff = W_OFFSET(_rl_vis_botlin, wrap_offset);
+ botline_length = VIS_LLEN(_rl_vis_botlin) - woff;
+ /* If we've wrapped lines, remove the final xterm line-wrap flag. */
+ if (full_lines && _rl_term_autowrap && botline_length == _rl_screenwidth)
+ {
+ char *last_line, *last_face;
+
+ /* LAST_LINE includes invisible characters, so if you want to get the
+ last character of the first line, you have to take WOFF into account.
+ This needs to be done for both calls to _rl_move_cursor_relative,
+ which takes a buffer position as the first argument, and any direct
+ subscripts of LAST_LINE. */
+ last_line = &visible_line[vis_lbreaks[_rl_vis_botlin]]; /* = VIS_CHARS(_rl_vis_botlin); */
+ last_face = &vis_face[vis_lbreaks[_rl_vis_botlin]]; /* = VIS_CHARS(_rl_vis_botlin); */
+ cpos_buffer_position = -1; /* don't know where we are in buffer */
+ _rl_move_cursor_relative (_rl_screenwidth - 1 + woff, last_line, last_face); /* XXX */
+ _rl_clear_to_eol (0);
+ puts_face (&last_line[_rl_screenwidth - 1 + woff],
+ &last_face[_rl_screenwidth - 1 + woff], 1);
+ }
+ _rl_vis_botlin = 0;
+ if (botline_length > 0 || _rl_last_c_pos > 0)
+ rl_crlf ();
+ fflush (rl_outstream);
+ rl_display_fixed++;
+}
+
+/* Move to the start of the current line. */
+static void
+cr (void)
+{
+ _rl_cr ();
+ _rl_last_c_pos = 0;
+}
+
+/* Redraw the last line of a multi-line prompt that may possibly contain
+ terminal escape sequences. Called with the cursor at column 0 of the
+ line to draw the prompt on. */
+static void
+redraw_prompt (char *t)
+{
+ char *oldp;
+
+ oldp = rl_display_prompt;
+ rl_save_prompt ();
+
+ rl_display_prompt = t;
+ local_prompt = expand_prompt (t, PMT_MULTILINE,
+ &prompt_visible_length,
+ &prompt_last_invisible,
+ &prompt_invis_chars_first_line,
+ &prompt_physical_chars);
+ local_prompt_prefix = (char *)NULL;
+ local_prompt_len = local_prompt ? strlen (local_prompt) : 0;
+
+ rl_forced_update_display ();
+
+ rl_display_prompt = oldp;
+ rl_restore_prompt();
+}
+
+/* Redisplay the current line after a SIGWINCH is received. */
+void
+_rl_redisplay_after_sigwinch (void)
+{
+ char *t;
+
+ /* Clear the last line (assuming that the screen size change will result in
+ either more or fewer characters on that line only) and put the cursor at
+ column 0. Make sure the right thing happens if we have wrapped to a new
+ screen line. */
+ if (_rl_term_cr)
+ {
+ rl_clear_visible_line ();
+ if (_rl_last_v_pos > 0)
+ _rl_move_vert (0);
+ }
+ else
+ rl_crlf ();
+
+ if (_rl_screenwidth < prompt_visible_length)
+ _rl_reset_prompt (); /* update local_prompt_newlines array */
+
+ /* Redraw only the last line of a multi-line prompt. */
+ t = strrchr (rl_display_prompt, '\n');
+ if (t)
+ redraw_prompt (++t);
+ else
+ rl_forced_update_display ();
+}
+
+void
+_rl_clean_up_for_exit (void)
+{
+ if (_rl_echoing_p)
+ {
+ if (_rl_vis_botlin > 0) /* minor optimization plus bug fix */
+ _rl_move_vert (_rl_vis_botlin);
+ _rl_vis_botlin = 0;
+ fflush (rl_outstream);
+ rl_restart_output (1, 0);
+ }
+}
+
+void
+_rl_erase_entire_line (void)
+{
+ cr ();
+ _rl_clear_to_eol (0);
+ cr ();
+ fflush (rl_outstream);
+}
+
+void
+_rl_ttyflush (void)
+{
+ fflush (rl_outstream);
+}
+
+/* return the `current display line' of the cursor -- the number of lines to
+ move up to get to the first screen line of the current readline line. */
+int
+_rl_current_display_line (void)
+{
+ int ret, nleft;
+
+ /* Find out whether or not there might be invisible characters in the
+ editing buffer. */
+ if (rl_display_prompt == rl_prompt)
+ nleft = _rl_last_c_pos - _rl_screenwidth - rl_visible_prompt_length;
+ else
+ nleft = _rl_last_c_pos - _rl_screenwidth;
+
+ if (nleft > 0)
+ ret = 1 + nleft / _rl_screenwidth;
+ else
+ ret = 0;
+
+ return ret;
+}
+
+void
+_rl_refresh_line (void)
+{
+ rl_clear_visible_line ();
+ rl_redraw_prompt_last_line ();
+ rl_keep_mark_active ();
+}
+
+#if defined (HANDLE_MULTIBYTE)
+/* Calculate the number of screen columns occupied by STR from START to END.
+ In the case of multibyte characters with stateful encoding, we have to
+ scan from the beginning of the string to take the state into account. */
+static int
+_rl_col_width (const char *str, int start, int end, int flags)
+{
+ WCHAR_T wc;
+ mbstate_t ps;
+ int tmp, point, width, max;
+
+ if (end <= start)
+ return 0;
+ if (MB_CUR_MAX == 1 || rl_byte_oriented)
+ /* this can happen in some cases where it's inconvenient to check */
+ return (end - start);
+
+ memset (&ps, 0, sizeof (mbstate_t));
+
+ point = 0;
+ max = end;
+
+ /* Try to short-circuit common cases. The adjustment to remove wrap_offset
+ is done by the caller. */
+ /* 1. prompt string */
+ if (flags && start == 0 && end == local_prompt_len && memcmp (str, local_prompt, local_prompt_len) == 0)
+ return (prompt_physical_chars + wrap_offset);
+ /* 2. prompt string + line contents */
+ else if (flags && start == 0 && local_prompt_len > 0 && end > local_prompt_len && local_prompt && memcmp (str, local_prompt, local_prompt_len) == 0)
+ {
+ tmp = prompt_physical_chars + wrap_offset;
+ /* XXX - try to call ourselves recursively with non-prompt portion */
+ tmp += _rl_col_width (str, local_prompt_len, end, flags);
+ return (tmp);
+ }
+
+ while (point < start)
+ {
+ if (_rl_utf8locale && UTF8_SINGLEBYTE(str[point]))
+ {
+ memset (&ps, 0, sizeof (mbstate_t));
+ tmp = 1;
+ }
+ else
+ tmp = mbrlen (str + point, max, &ps);
+ if (MB_INVALIDCH ((size_t)tmp))
+ {
+ /* In this case, the bytes are invalid or too short to compose a
+ multibyte character, so we assume that the first byte represents
+ a single character. */
+ point++;
+ max--;
+
+ /* Clear the state of the byte sequence, because in this case the
+ effect of mbstate is undefined. */
+ memset (&ps, 0, sizeof (mbstate_t));
+ }
+ else if (MB_NULLWCH (tmp))
+ break; /* Found '\0' */
+ else
+ {
+ point += tmp;
+ max -= tmp;
+ }
+ }
+
+ /* If START is not a byte that starts a character, then POINT will be
+ greater than START. In this case, assume that (POINT - START) gives
+ a byte count that is the number of columns of difference. */
+ width = point - start;
+
+ while (point < end)
+ {
+ if (_rl_utf8locale && UTF8_SINGLEBYTE(str[point]))
+ {
+ tmp = 1;
+ wc = (WCHAR_T) str[point];
+ }
+ else
+ tmp = MBRTOWC (&wc, str + point, max, &ps);
+ if (MB_INVALIDCH ((size_t)tmp))
+ {
+ /* In this case, the bytes are invalid or too short to compose a
+ multibyte character, so we assume that the first byte represents
+ a single character. */
+ point++;
+ max--;
+
+ /* and assume that the byte occupies a single column. */
+ width++;
+
+ /* Clear the state of the byte sequence, because in this case the
+ effect of mbstate is undefined. */
+ memset (&ps, 0, sizeof (mbstate_t));
+ }
+ else if (MB_NULLWCH (tmp))
+ break; /* Found '\0' */
+ else
+ {
+ point += tmp;
+ max -= tmp;
+ tmp = WCWIDTH(wc);
+ width += (tmp >= 0) ? tmp : 1;
+ }
+ }
+
+ width += point - end;
+
+ return width;
+}
+#endif /* HANDLE_MULTIBYTE */