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/* display.c -- readline redisplay facility. */ /* Copyright (C) 1987-2005 Free Software Foundation, Inc. This file is part of the GNU Readline Library, a library for reading lines of text with interactive input and history editing. The GNU Readline Library 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 2, or (at your option) any later version. The GNU Readline Library 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. The GNU General Public License is often shipped with GNU software, and is generally kept in a file called COPYING or LICENSE. If you do not have a copy of the license, write to the Free Software Foundation, 59 Temple Place, Suite 330, Boston, MA 02111 USA. */ #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__ */ #if defined (HACK_TERMCAP_MOTION) extern char *_rl_term_forward_char; #endif static void update_line PARAMS((char *, char *, int, int, int, int)); static void space_to_eol PARAMS((int)); static void delete_chars PARAMS((int)); static void insert_some_chars PARAMS((char *, int, int)); static void cr PARAMS((void)); #if defined (HANDLE_MULTIBYTE) static int _rl_col_width PARAMS((const char *, int, int)); static int *_rl_wrapped_line; #else # define _rl_col_width(l, s, e) (((e) <= (s)) ? 0 : (e) - (s)) #endif static int *inv_lbreaks, *vis_lbreaks; static int inv_lbsize, vis_lbsize; /* 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. */ #define CR_FASTER(new, cur) (((new) + 1) < ((cur) - (new))) /* **************************************************************** */ /* */ /* 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; int _rl_suppress_redisplay = 0; int _rl_want_redisplay = 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; /* Pseudo-global variables declared here. */ /* 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; static int cpos_adjusted; /* Number of lines currently on screen minus 1. */ int _rl_vis_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; /* The line display buffers. One is the line currently displayed on the screen. The other is the line about to be displayed. */ static char *visible_line = (char *)NULL; static char *invisible_line = (char *)NULL; /* A buffer for `modeline' messages. */ static char msg_buf[128]; /* 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 = 1024; /* Variables to keep track of the expanded prompt string, which may include invisible characters. */ static char *local_prompt, *local_prompt_prefix; static int prompt_visible_length, prompt_prefix_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; /* 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_last_invisible; static int saved_visible_length; static int saved_prefix_length; static int saved_invis_chars_first_line; static int saved_physical_chars; /* 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. */ /* 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'. */ static char * expand_prompt (pmt, lp, lip, niflp, vlp) char *pmt; int *lp, *lip, *niflp, *vlp; { char *r, *ret, *p; int l, rl, last, ignoring, ninvis, invfl, invflset, ind, pind, physchars; /* Short-circuit if we can. */ if ((MB_CUR_MAX <= 1 || rl_byte_oriented) && strchr (pmt, RL_PROMPT_START_IGNORE) == 0) { r = savestring (pmt); if (lp) *lp = strlen (r); if (lip) *lip = 0; if (niflp) *niflp = 0; if (vlp) *vlp = lp ? *lp : strlen (r); return r; } l = strlen (pmt); r = ret = (char *)xmalloc (l + 1); invfl = 0; /* invisible chars in first line of prompt */ invflset = 0; /* we only want to set invfl once */ for (rl = ignoring = last = ninvis = physchars = 0, p = pmt; p && *p; p++) { /* This code strips the invisible character string markers RL_PROMPT_START_IGNORE and RL_PROMPT_END_IGNORE */ if (*p == RL_PROMPT_START_IGNORE) { ignoring++; continue; } else if (ignoring && *p == RL_PROMPT_END_IGNORE) { ignoring = 0; if (p[-1] != RL_PROMPT_START_IGNORE) last = r - ret - 1; continue; } else { #if defined (HANDLE_MULTIBYTE) if (MB_CUR_MAX > 1 && rl_byte_oriented == 0) { pind = p - pmt; ind = _rl_find_next_mbchar (pmt, pind, 1, MB_FIND_NONZERO); l = ind - pind; while (l--) *r++ = *p++; if (!ignoring) { rl += ind - pind; physchars += _rl_col_width (pmt, pind, ind); } 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 && rl >= _rl_screenwidth) { invfl = ninvis; invflset = 1; } } } if (rl < _rl_screenwidth) invfl = ninvis; *r = '\0'; if (lp) *lp = rl; if (lip) *lip = last; if (niflp) *niflp = invfl; if (vlp) *vlp = physchars; 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 (pmt) char *pmt; { char *ret; ret = expand_prompt (pmt, (int *)NULL, (int *)NULL, (int *)NULL, (int *)NULL); return ret; } /* * 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 * * 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. */ int rl_expand_prompt (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; 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) { /* The prompt is only one logical line, though it might wrap. */ local_prompt = expand_prompt (prompt, &prompt_visible_length, &prompt_last_invisible, &prompt_invis_chars_first_line, &prompt_physical_chars); local_prompt_prefix = (char *)0; return (prompt_visible_length); } else { /* The prompt spans multiple lines. */ t = ++p; local_prompt = expand_prompt (p, &prompt_visible_length, &prompt_last_invisible, (int *)NULL, &prompt_physical_chars); 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, &prompt_prefix_length, (int *)NULL, &prompt_invis_chars_first_line, (int *)NULL); *t = c; return (prompt_prefix_length); } } /* 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 (minsize) int minsize; { register int n; if (invisible_line == 0) /* initialize it */ { if (line_size < minsize) line_size = minsize; visible_line = (char *)xmalloc (line_size); invisible_line = (char *)xmalloc (line_size); } else if (line_size < minsize) /* ensure it can hold MINSIZE chars */ { line_size *= 2; if (line_size < minsize) line_size = minsize; visible_line = (char *)xrealloc (visible_line, line_size); invisible_line = (char *)xrealloc (invisible_line, line_size); } for (n = minsize; n < line_size; n++) { visible_line[n] = 0; invisible_line[n] = 1; } if (vis_lbreaks == 0) { /* should be enough. */ inv_lbsize = vis_lbsize = 256; inv_lbreaks = (int *)xmalloc (inv_lbsize * sizeof (int)); vis_lbreaks = (int *)xmalloc (vis_lbsize * sizeof (int)); #if defined (HANDLE_MULTIBYTE) _rl_wrapped_line = (int *)xmalloc (vis_lbsize * sizeof (int)); #endif inv_lbreaks[0] = vis_lbreaks[0] = 0; } } /* Basic redisplay algorithm. */ void rl_redisplay () { register int in, out, c, linenum, cursor_linenum; register char *line; int c_pos, inv_botlin, lb_botlin, lb_linenum, o_cpos; int newlines, lpos, temp, modmark, n0, num; char *prompt_this_line; #if defined (HANDLE_MULTIBYTE) wchar_t wc; size_t wc_bytes; int wc_width; mbstate_t ps; int _rl_wrapped_multicolumn = 0; #endif if (!readline_echoing_p) return; /* Signals are blocked through this function as the global data structures could get corrupted upon modifications from an invoked signal handler. */ _rl_block_sigint (); if (!rl_display_prompt) rl_display_prompt = ""; if (invisible_line == 0 || vis_lbreaks == 0) { init_line_structures (0); rl_on_new_line (); } /* Draw the line into the buffer. */ c_pos = -1; line = invisible_line; 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) { line[out++] = '*'; line[out] = '\0'; 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 in the prompt string. */ if (rl_display_prompt == rl_prompt || local_prompt) { int local_len = local_prompt ? strlen (local_prompt) : 0; if (local_prompt_prefix && forced_display) _rl_output_some_chars (local_prompt_prefix, strlen (local_prompt_prefix)); if (local_len > 0) { temp = local_len + out + 2; if (temp >= line_size) { line_size = (temp + 1024) - (temp % 1024); visible_line = (char *)xrealloc (visible_line, line_size); line = invisible_line = (char *)xrealloc (invisible_line, line_size); } strncpy (line + out, local_prompt, local_len); out += local_len; } line[out] = '\0'; wrap_offset = local_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); temp = pmtlen + out + 2; if (temp >= line_size) { line_size = (temp + 1024) - (temp % 1024); visible_line = (char *)xrealloc (visible_line, line_size); line = invisible_line = (char *)xrealloc (invisible_line, line_size); } strncpy (line + out, prompt_this_line, pmtlen); out += pmtlen; line[out] = '\0'; wrap_offset = prompt_invis_chars_first_line = 0; } #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) #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)); \ _rl_wrapped_line = (int *)xrealloc (_rl_wrapped_line, inv_lbsize * sizeof (int)); \ } \ inv_lbreaks[++newlines] = out; \ _rl_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; #if 0 lpos = out - wrap_offset; #else lpos = prompt_physical_chars + modmark; #endif #if defined (HANDLE_MULTIBYTE) memset (_rl_wrapped_line, 0, vis_lbsize); num = 0; #endif /* prompt_invis_chars_first_line is the number of invisible characters in the first physical line of the prompt. wrap_offset - prompt_invis_chars_first_line is the number of invis chars on the second line. */ /* what if lpos is already >= _rl_screenwidth before we start drawing the contents of the command line? */ while (lpos >= _rl_screenwidth) { /* fix from Darin Johnson <darin@acuson.com> for prompt string with invisible characters that is longer than the screen width. The prompt_invis_chars_first_line variable could be made into an array saying how many invisible characters there are per line, but that's probably too much work for the benefit gained. How many people have prompts that exceed two physical lines? Additional logic fix from Edward Catmur <ed@catmur.co.uk> */ #if defined (HANDLE_MULTIBYTE) n0 = num; temp = local_prompt ? strlen (local_prompt) : 0; while (num < temp) { if (_rl_col_width (local_prompt, n0, num) > _rl_screenwidth) { num = _rl_find_prev_mbchar (local_prompt, num, MB_FIND_ANY); break; } num++; } temp = num + #else temp = ((newlines + 1) * _rl_screenwidth) + #endif /* !HANDLE_MULTIBYTE */ ((local_prompt_prefix == 0) ? ((newlines == 0) ? prompt_invis_chars_first_line : ((newlines == 1) ? wrap_offset : 0)) : ((newlines == 0) ? wrap_offset :0)); inv_lbreaks[++newlines] = temp; #if defined (HANDLE_MULTIBYTE) lpos -= _rl_col_width (local_prompt, n0, num); #else lpos -= _rl_screenwidth; #endif } prompt_last_screen_line = newlines; /* Draw the rest of the line (after the prompt) into invisible_line, keeping track of where the cursor is (c_pos), 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)); 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 { 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 (out + 8 >= line_size) /* XXX - 8 for \t */ { line_size *= 2; visible_line = (char *)xrealloc (visible_line, line_size); invisible_line = (char *)xrealloc (invisible_line, line_size); line = invisible_line; } if (in == rl_point) { c_pos = 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) { sprintf (line + out, "\\%o", c); if (lpos + 4 >= _rl_screenwidth) { temp = _rl_screenwidth - lpos; CHECK_INV_LBREAKS (); inv_lbreaks[++newlines] = out + temp; lpos = 4 - temp; } else lpos += 4; out += 4; } else { line[out++] = c; CHECK_LPOS(); } } #if defined (DISPLAY_TABS) else if (c == '\t') { register int newout; #if 0 newout = (out | (int)7) + 1; #else newout = out + 8 - lpos % 8; #endif temp = newout - out; if (lpos + temp >= _rl_screenwidth) { register int temp2; temp2 = _rl_screenwidth - lpos; CHECK_INV_LBREAKS (); inv_lbreaks[++newlines] = out + temp2; lpos = temp - temp2; while (out < newout) line[out++] = ' '; } else { while (out < newout) line[out++] = ' '; lpos += temp; } } #endif else if (c == '\n' && _rl_horizontal_scroll_mode == 0 && _rl_term_up && *_rl_term_up) { line[out++] = '\0'; /* XXX - sentinel */ CHECK_INV_LBREAKS (); inv_lbreaks[++newlines] = out; lpos = 0; } else if (CTRL_CHAR (c) || c == RUBOUT) { line[out++] = '^'; CHECK_LPOS(); line[out++] = CTRL_CHAR (c) ? UNCTRL (c) : '?'; 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() */ line[out++] = ' '; _rl_wrapped_multicolumn++; CHECK_LPOS(); } if (in == rl_point) { c_pos = out; lb_linenum = newlines; } for (i = in; i < in+wc_bytes; i++) line[out++] = rl_line_buffer[i]; for (i = 0; i < wc_width; i++) CHECK_LPOS(); } else { line[out++] = c; CHECK_LPOS(); } #else line[out++] = c; CHECK_LPOS(); #endif } #if defined (HANDLE_MULTIBYTE) if (MB_CUR_MAX > 1 && rl_byte_oriented == 0) { in += wc_bytes; wc_bytes = mbrtowc (&wc, rl_line_buffer + in, rl_end - in, &ps); } else in++; #endif } line[out] = '\0'; if (c_pos < 0) { c_pos = out; lb_linenum = newlines; } inv_botlin = lb_botlin = newlines; CHECK_INV_LBREAKS (); inv_lbreaks[newlines+1] = out; cursor_linenum = lb_linenum; /* C_POS == 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. */ 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 (MB_CUR_MAX > 1 && rl_byte_oriented == 0) out = _rl_find_prev_mbchar (line, _rl_screenchars, MB_FIND_ANY); else 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 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_LINE(line) ((line) > _rl_vis_botlin) ? "" : VIS_CHARS(line) #define INV_LINE(line) (invisible_line + inv_lbreaks[line]) /* For each line in the buffer, do the updating display. */ for (linenum = 0; linenum <= inv_botlin; linenum++) { o_cpos = _rl_last_c_pos; cpos_adjusted = 0; update_line (VIS_LINE(linenum), INV_LINE(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. See if compensating here is the right thing, or if we have to change update_line itself. There is one case 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 (linenum == 0 && (MB_CUR_MAX > 1 && rl_byte_oriented == 0) && cpos_adjusted == 0 && _rl_last_c_pos != o_cpos && _rl_last_c_pos > wrap_offset && o_cpos < prompt_last_invisible) _rl_last_c_pos -= wrap_offset; /* 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); } /* 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); _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; } /* 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. */ nleft = prompt_visible_length + wrap_offset; if (cursor_linenum == 0 && wrap_offset > 0 && _rl_last_c_pos > 0 && _rl_last_c_pos <= prompt_last_invisible && local_prompt) { #if defined (__MSDOS__) putc ('\r', rl_outstream); #else if (_rl_term_cr) tputs (_rl_term_cr, 1, _rl_output_character_function); #endif _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) - wrap_offset; else _rl_last_c_pos = nleft; } /* Where on that line? And where does that line start in the buffer? */ pos = inv_lbreaks[cursor_linenum]; /* nleft == number of characters in the line buffer between the start of the line and the cursor position. */ nleft = c_pos - 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 (wrap_offset && cursor_linenum == 0 && nleft < _rl_last_c_pos) { if (MB_CUR_MAX > 1 && rl_byte_oriented == 0) tx = _rl_col_width (&visible_line[pos], 0, nleft) - visible_wrap_offset; else tx = nleft; if (_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]); else if (nleft != _rl_last_c_pos) _rl_move_cursor_relative (nleft, &invisible_line[pos]); } } else /* Do horizontal scrolling. */ { #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 = c_pos - 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 = c_pos - (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 = c_pos - (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 = ((c_pos - 1) / t) * t; /* XXX */ if (wrap_offset && lmargin > 0 && lmargin < nleft) lmargin = nleft; } else lmargin = last_lmargin; /* 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) 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 < out) line[t - 1] = '>'; if (!rl_display_fixed || forced_display || lmargin != last_lmargin) { forced_display = 0; update_line (&visible_line[last_lmargin], &invisible_line[lmargin], 0, _rl_screenwidth + visible_wrap_offset, _rl_screenwidth + (lmargin ? 0 : wrap_offset), 0); /* 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) && 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 (c_pos - lmargin, &invisible_line[lmargin]); last_lmargin = lmargin; } } fflush (rl_outstream); /* Swap visible and non-visible lines. */ { char *vtemp = visible_line; int *itemp = vis_lbreaks, ntemp = vis_lbsize; visible_line = invisible_line; invisible_line = vtemp; vis_lbreaks = inv_lbreaks; inv_lbreaks = itemp; vis_lbsize = inv_lbsize; inv_lbsize = ntemp; 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_release_sigint (); } /* 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 (old, new, current_line, omax, nmax, inv_botlin) register char *old, *new; int current_line, omax, nmax, inv_botlin; { register char *ofd, *ols, *oe, *nfd, *nls, *ne; int temp, lendiff, wsatend, od, nd; int current_invis_chars; int col_lendiff, col_temp; #if defined (HANDLE_MULTIBYTE) mbstate_t ps_new, ps_old; int new_offset, old_offset, tmp; #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 - W_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) { #if defined (HANDLE_MULTIBYTE) if (MB_CUR_MAX > 1 && rl_byte_oriented == 0) { wchar_t wc; mbstate_t ps; int tempwidth, bytes; size_t ret; /* This fixes only double-column characters, but if the wrapped character comsumes more than three columns, spaces will be inserted in the string buffer. */ if (_rl_wrapped_line[current_line] > 0) _rl_clear_to_eol (_rl_wrapped_line[current_line]); memset (&ps, 0, sizeof (mbstate_t)); ret = mbrtowc (&wc, new, MB_CUR_MAX, &ps); if (MB_INVALIDCH (ret)) { tempwidth = 1; ret = 1; } else if (MB_NULLWCH (ret)) tempwidth = 0; else tempwidth = wcwidth (wc); if (tempwidth > 0) { int count; bytes = ret; for (count = 0; count < bytes; count++) putc (new[count], rl_outstream); _rl_last_c_pos = tempwidth; _rl_last_v_pos++; memset (&ps, 0, sizeof (mbstate_t)); ret = mbrtowc (&wc, old, MB_CUR_MAX, &ps); if (ret != 0 && bytes != 0) { if (MB_INVALIDCH (ret)) memmove (old+bytes, old+1, strlen (old+1)); else memmove (old+bytes, old+ret, strlen (old+ret)); memcpy (old, new, bytes); } } else { putc (' ', rl_outstream); _rl_last_c_pos = 1; _rl_last_v_pos++; if (old[0] && new[0]) old[0] = new[0]; } } else #endif { if (new[0]) putc (new[0], rl_outstream); else putc (' ', rl_outstream); _rl_last_c_pos = 1; _rl_last_v_pos++; if (old[0] && new[0]) old[0] = new[0]; } } /* 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) { ofd = old + temp; nfd = new + temp; } else { memset (&ps_new, 0, sizeof(mbstate_t)); memset (&ps_old, 0, sizeof(mbstate_t)); if (omax == nmax && STREQN (new, old, omax)) { ofd = old + omax; nfd = new + nmax; } else { new_offset = old_offset = 0; for (ofd = old, nfd = new; (ofd - old < omax) && *ofd && _rl_compare_chars(old, old_offset, &ps_old, new, new_offset, &ps_new); ) { 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; nfd = new + new_offset; } } } } else #endif for (ofd = old, nfd = new; (ofd - old < omax) && *ofd && (*ofd == *nfd); ofd++, nfd++) ; /* 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; wsatend = 1; /* flag for trailing whitespace */ #if defined (HANDLE_MULTIBYTE) if (MB_CUR_MAX > 1 && rl_byte_oriented == 0) { ols = old + _rl_find_prev_mbchar (old, oe - old, MB_FIND_ANY); nls = new + _rl_find_prev_mbchar (new, ne - new, MB_FIND_ANY); while ((ols > ofd) && (nls > nfd)) { memset (&ps_old, 0, sizeof (mbstate_t)); memset (&ps_new, 0, sizeof (mbstate_t)); #if 0 /* On advice from jir@yamato.ibm.com */ _rl_adjust_point (old, ols - old, &ps_old); _rl_adjust_point (new, nls - new, &ps_new); #endif if (_rl_compare_chars (old, ols - old, &ps_old, new, nls - new, &ps_new) == 0) break; if (*ols == ' ') wsatend = 0; ols = old + _rl_find_prev_mbchar (old, ols - old, MB_FIND_ANY); nls = new + _rl_find_prev_mbchar (new, nls - new, MB_FIND_ANY); } } else { #endif /* HANDLE_MULTIBYTE */ ols = oe - 1; /* find last same */ nls = ne - 1; while ((ols > ofd) && (nls > nfd) && (*ols == *nls)) { if (*ols != ' ') wsatend = 0; ols--; nls--; } #if defined (HANDLE_MULTIBYTE) } #endif if (wsatend) { ols = oe; nls = ne; } #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) #else else if (*ols != *nls) #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++; } } /* 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); 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 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 ? strlen (local_prompt) : 0; od = ofd - old; /* index of first difference in visible line */ if (current_line == 0 && !_rl_horizontal_scroll_mode && _rl_term_cr && lendiff > prompt_visible_length && _rl_last_c_pos > 0 && od >= lendiff && _rl_last_c_pos <= prompt_last_invisible) { #if defined (__MSDOS__) putc ('\r', rl_outstream); #else tputs (_rl_term_cr, 1, _rl_output_character_function); #endif _rl_output_some_chars (local_prompt, lendiff); if (MB_CUR_MAX > 1 && rl_byte_oriented == 0) { /* 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) - wrap_offset; cpos_adjusted = 1; } else _rl_last_c_pos = lendiff; } _rl_move_cursor_relative (od, old); /* if (len (new) > len (old)) lendiff == difference in buffer col_lendiff == difference on screen When not using multibyte characters, these are equal */ lendiff = (nls - nfd) - (ols - ofd); if (MB_CUR_MAX > 1 && rl_byte_oriented == 0) col_lendiff = _rl_col_width (new, nfd - new, nls - new) - _rl_col_width (old, ofd - old, ols - old); else col_lendiff = lendiff; /* 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 && !_rl_horizontal_scroll_mode && 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; } } /* 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); else col_temp = temp; 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; /* 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. */ 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. */ if (*ols && (!_rl_horizontal_scroll_mode || _rl_last_c_pos > 0 || lendiff <= prompt_visible_length || !current_invis_chars)) { insert_some_chars (nfd, lendiff, col_lendiff); _rl_last_c_pos += col_lendiff; } 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. */ /* However, this screws up the rest of this block, which assumes you've done the insert because you can. */ _rl_output_some_chars (nfd, lendiff); _rl_last_c_pos += col_lendiff; } else { /* We have horizontal scrolling and we are not inserting at the end. We have invisible characters in this line. This is a dumb update. */ _rl_output_some_chars (nfd, temp); _rl_last_c_pos += col_temp; return; } /* Copy (new) chars to screen from first diff to last match. */ temp = nls - nfd; if ((temp - lendiff) > 0) { _rl_output_some_chars (nfd + lendiff, temp - lendiff); #if 1 /* XXX -- this bears closer inspection. Fixes a redisplay bug reported against bash-3.0-alpha by Andreas Schwab involving multibyte characters and prompt strings with invisible characters, but was previously disabled. */ _rl_last_c_pos += _rl_col_width (nfd+lendiff, 0, temp-col_lendiff); #else _rl_last_c_pos += _rl_col_width (nfd+lendiff, 0, temp-lendiff); #endif } } else { /* cannot insert chars, write to EOL */ _rl_output_some_chars (nfd, 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. */ } } 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 && -lendiff == visible_wrap_offset) col_lendiff = 0; if (col_lendiff) delete_chars (-col_lendiff); /* delete (diff) characters */ /* Copy (new) chars to screen from first diff to last match */ temp = nls - nfd; if (temp > 0) { _rl_output_some_chars (nfd, temp); _rl_last_c_pos += _rl_col_width (nfd, 0, temp);; } } /* Otherwise, print over the existing material. */ else { if (temp > 0) { _rl_output_some_chars (nfd, temp); _rl_last_c_pos += col_temp; /* XXX */ } lendiff = (oe - old) - (ne - new); if (MB_CUR_MAX > 1 && rl_byte_oriented == 0) col_lendiff = _rl_col_width (old, 0, oe - old) - _rl_col_width (new, 0, ne - new); else col_lendiff = lendiff; if (col_lendiff) { 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 () { 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; } /* 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. */ int rl_on_new_line_with_prompt () { 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); /* 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 () { if (visible_line) { register char *temp = visible_line; while (*temp) *temp++ = '\0'; } rl_on_new_line (); forced_display++; (*rl_redisplay_function) (); return 0; } /* 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. */ void _rl_move_cursor_relative (new, data) int new; const char *data; { register int i; int woff; /* number of invisible chars on current line */ int cpos, dpos; /* current and desired cursor positions */ woff = W_OFFSET (_rl_last_v_pos, wrap_offset); cpos = _rl_last_c_pos; #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) { dpos = _rl_col_width (data, 0, new); if (dpos > woff) dpos -= woff; } 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 (new == 0 || CR_FASTER (new, _rl_last_c_pos) || (_rl_term_autowrap && i == _rl_screenwidth)) { #if defined (__MSDOS__) putc ('\r', rl_outstream); #else tputs (_rl_term_cr, 1, _rl_output_character_function); #endif /* !__MSDOS__ */ 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. */ #if defined (HACK_TERMCAP_MOTION) if (_rl_term_forward_char) { for (i = cpos; i < dpos; i++) tputs (_rl_term_forward_char, 1, _rl_output_character_function); } else #endif /* HACK_TERMCAP_MOTION */ if (MB_CUR_MAX > 1 && rl_byte_oriented == 0) { tputs (_rl_term_cr, 1, _rl_output_character_function); for (i = 0; i < new; i++) putc (data[i], rl_outstream); } else for (i = cpos; i < new; i++) putc (data[i], rl_outstream); } #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 (to) 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); #if defined (__MSDOS__) putc ('\r', rl_outstream); #else tputs (_rl_term_cr, 1, _rl_output_character_function); #endif _rl_last_c_pos = 0; } else { /* delta < 0 */ #ifdef __MSDOS__ int row, col; fflush (rl_outstream); /* make sure the cursor pos is current! */ ScreenGetCursor (&row, &col); ScreenSetCursor (row + delta, col); i = -delta; /* in case someone wants to use it after the loop */ #else /* !__MSDOS__ */ if (_rl_term_up && *_rl_term_up) for (i = 0; i < -delta; i++) tputs (_rl_term_up, 1, _rl_output_character_function); #endif /* !__MSDOS__ */ } _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 (c) int c; { int n = 1; if (META_CHAR (c) && (_rl_output_meta_chars == 0)) { fprintf (rl_outstream, "M-"); n += 2; c = UNMETA (c); } #if defined (DISPLAY_TABS) if ((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 (c, pos) register int c, 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 (PREFER_STDARG) va_start (args, format); #else va_start (args); format = va_arg (args, char *); #endif #if defined (HAVE_VSNPRINTF) vsnprintf (msg_buf, sizeof (msg_buf) - 1, format, args); #else vsprintf (msg_buf, format, args); msg_buf[sizeof(msg_buf) - 1] = '\0'; /* overflow? */ #endif va_end (args); if (saved_local_prompt == 0) { rl_save_prompt (); msg_saved_prompt = 1; } rl_display_prompt = msg_buf; local_prompt = expand_prompt (msg_buf, &prompt_visible_length, &prompt_last_invisible, &prompt_invis_chars_first_line, &prompt_physical_chars); local_prompt_prefix = (char *)NULL; (*rl_redisplay_function) (); return 0; } #else /* !USE_VARARGS */ int rl_message (format, arg1, arg2) char *format; { sprintf (msg_buf, format, arg1, arg2); msg_buf[sizeof(msg_buf) - 1] = '\0'; /* overflow? */ rl_display_prompt = msg_buf; if (saved_local_prompt == 0) { rl_save_prompt (); msg_saved_prompt = 1; } local_prompt = expand_prompt (msg_buf, &prompt_visible_length, &prompt_last_invisible, &prompt_invis_chars_first_line, &prompt_physical_chars); local_prompt_prefix = (char *)NULL; (*rl_redisplay_function) (); return 0; } #endif /* !USE_VARARGS */ /* How to clear things from the "echo-area". */ int rl_clear_message () { 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 () { rl_on_new_line (); rl_display_prompt = rl_prompt ? rl_prompt : ""; forced_display = 1; return 0; } void rl_save_prompt () { saved_local_prompt = local_prompt; saved_local_prefix = local_prompt_prefix; saved_prefix_length = prompt_prefix_length; 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; local_prompt = local_prompt_prefix = (char *)0; prompt_last_invisible = prompt_visible_length = prompt_prefix_length = 0; prompt_invis_chars_first_line = prompt_physical_chars = 0; } void rl_restore_prompt () { FREE (local_prompt); FREE (local_prompt_prefix); local_prompt = saved_local_prompt; local_prompt_prefix = saved_local_prefix; 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_last_invisible = saved_visible_length = saved_prefix_length = 0; saved_invis_chars_first_line = saved_physical_chars = 0; } char * _rl_make_prompt_for_search (pchar) 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 (l) 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, */ void _rl_clear_to_eol (count) 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 (count) int count; { register int i; for (i = 0; i < count; i++) putc (' ', rl_outstream); _rl_last_c_pos += count; } void _rl_clear_screen () { #if defined (__GO32__) ScreenClear (); /* FIXME: only works in text modes */ ScreenSetCursor (0, 0); /* term_clrpag is "cl" which homes the cursor */ #else if (_rl_term_clrpag) tputs (_rl_term_clrpag, 1, _rl_output_character_function); else rl_crlf (); #endif } /* Insert COUNT characters from STRING to the output stream at column COL. */ static void insert_some_chars (string, count, col) char *string; int count, col; { #if defined (__MSDOS__) || defined (__MINGW32__) _rl_output_some_chars (string, count); #else /* DEBUGGING */ if (MB_CUR_MAX == 1 || rl_byte_oriented) if (count != col) fprintf(stderr, "readline: debug: insert_some_chars: count (%d) != col (%d)\n", count, col); /* If IC is defined, then we do not have to "enter" insert mode. */ if (_rl_term_IC) { char *buffer; buffer = tgoto (_rl_term_IC, 0, col); tputs (buffer, 1, _rl_output_character_function); _rl_output_some_chars (string, count); } else { register int i; /* If we have to turn on insert-mode, then do so. */ if (_rl_term_im && *_rl_term_im) tputs (_rl_term_im, 1, _rl_output_character_function); /* If there is a special command for inserting characters, then use that first to open up the space. */ if (_rl_term_ic && *_rl_term_ic) { for (i = col; i--; ) tputs (_rl_term_ic, 1, _rl_output_character_function); } /* Print the text. */ _rl_output_some_chars (string, count); /* If there is a string to turn off insert mode, we had best use it now. */ if (_rl_term_ei && *_rl_term_ei) tputs (_rl_term_ei, 1, _rl_output_character_function); } #endif /* __MSDOS__ || __MINGW32__ */ } /* Delete COUNT characters from the display line. */ static void delete_chars (count) int count; { if (count > _rl_screenwidth) /* XXX */ return; #if !defined (__MSDOS__) && !defined (__MINGW32__) 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__ */ } void _rl_update_final () { int full_lines; 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); /* If we've wrapped lines, remove the final xterm line-wrap flag. */ if (full_lines && _rl_term_autowrap && (VIS_LLEN(_rl_vis_botlin) == _rl_screenwidth)) { char *last_line; last_line = &visible_line[vis_lbreaks[_rl_vis_botlin]]; _rl_move_cursor_relative (_rl_screenwidth - 1, last_line); _rl_clear_to_eol (0); putc (last_line[_rl_screenwidth - 1], rl_outstream); } _rl_vis_botlin = 0; rl_crlf (); fflush (rl_outstream); rl_display_fixed++; } /* Move to the start of the current line. */ static void cr () { if (_rl_term_cr) { #if defined (__MSDOS__) putc ('\r', rl_outstream); #else tputs (_rl_term_cr, 1, _rl_output_character_function); #endif _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 (t) char *t; { char *oldp; oldp = rl_display_prompt; rl_save_prompt (); rl_display_prompt = t; local_prompt = expand_prompt (t, &prompt_visible_length, &prompt_last_invisible, &prompt_invis_chars_first_line, &prompt_physical_chars); local_prompt_prefix = (char *)NULL; 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 () { char *t; /* Clear the current line 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) { #if defined (__MSDOS__) putc ('\r', rl_outstream); #else tputs (_rl_term_cr, 1, _rl_output_character_function); #endif _rl_last_c_pos = 0; #if defined (__MSDOS__) space_to_eol (_rl_screenwidth); putc ('\r', rl_outstream); #else if (_rl_term_clreol) tputs (_rl_term_clreol, 1, _rl_output_character_function); else { space_to_eol (_rl_screenwidth); tputs (_rl_term_cr, 1, _rl_output_character_function); } #endif if (_rl_last_v_pos > 0) _rl_move_vert (0); } else rl_crlf (); /* 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 () { if (readline_echoing_p) { _rl_move_vert (_rl_vis_botlin); _rl_vis_botlin = 0; fflush (rl_outstream); rl_restart_output (1, 0); } } void _rl_erase_entire_line () { cr (); _rl_clear_to_eol (0); cr (); 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 () { 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; } #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 (str, start, end) const char *str; int start, end; { wchar_t wc; mbstate_t ps = {0}; int tmp, point, width, max; if (end <= start) return 0; point = 0; max = end; while (point < start) { 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) { 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 */
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