1 /* $NetBSD: refresh.c,v 1.58 2021/09/09 20:24:07 christos Exp $ */
4 * Copyright (c) 1992, 1993
5 * The Regents of the University of California. All rights reserved.
7 * This code is derived from software contributed to Berkeley by
8 * Christos Zoulas of Cornell University.
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the University nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 #if !defined(lint) && !defined(SCCSID)
38 static char sccsid[] = "@(#)refresh.c 8.1 (Berkeley) 6/4/93";
40 __RCSID("$NetBSD: refresh.c,v 1.58 2021/09/09 20:24:07 christos Exp $");
42 #endif /* not lint && not SCCSID */
45 * refresh.c: Lower level screen refreshing functions
54 static void re_nextline(EditLine *);
55 static void re_addc(EditLine *, wint_t);
56 static void re_update_line(EditLine *, wchar_t *, wchar_t *, int);
57 static void re_insert (EditLine *, wchar_t *, int, int, wchar_t *, int);
58 static void re_delete(EditLine *, wchar_t *, int, int, int);
59 static void re_fastputc(EditLine *, wint_t);
60 static void re_clear_eol(EditLine *, int, int, int);
61 static void re__strncopy(wchar_t *, wchar_t *, size_t);
62 static void re__copy_and_pad(wchar_t *, const wchar_t *, size_t);
65 static void re_printstr(EditLine *, const char *, wchar_t *, wchar_t *);
66 #define __F el->el_errfile
67 #define ELRE_ASSERT(a, b, c) do \
68 if (/*CONSTCOND*/ a) { \
72 while (/*CONSTCOND*/0)
73 #define ELRE_DEBUG(a, b) ELRE_ASSERT(a,b,;)
76 * Print a string on the debugging pty
79 re_printstr(EditLine *el, const char *str, wchar_t *f, wchar_t *t)
82 ELRE_DEBUG(1, (__F, "%s:\"", str));
84 ELRE_DEBUG(1, (__F, "%c", *f++ & 0177));
85 ELRE_DEBUG(1, (__F, "\"\r\n"));
88 #define ELRE_ASSERT(a, b, c)
89 #define ELRE_DEBUG(a, b)
93 * Move to the next line or scroll
96 re_nextline(EditLine *el)
98 el->el_refresh.r_cursor.h = 0; /* reset it. */
101 * If we would overflow (input is longer than terminal size),
102 * emulate scroll by dropping first line and shuffling the rest.
103 * We do this via pointer shuffling - it's safe in this case
104 * and we avoid memcpy().
106 if (el->el_refresh.r_cursor.v + 1 >= el->el_terminal.t_size.v) {
107 int i, lins = el->el_terminal.t_size.v;
108 wint_t *firstline = el->el_vdisplay[0];
110 for(i = 1; i < lins; i++)
111 el->el_vdisplay[i - 1] = el->el_vdisplay[i];
113 firstline[0] = '\0'; /* empty the string */
114 el->el_vdisplay[i - 1] = firstline;
116 el->el_refresh.r_cursor.v++;
118 ELRE_ASSERT(el->el_refresh.r_cursor.v >= el->el_terminal.t_size.v,
119 (__F, "\r\nre_putc: overflow! r_cursor.v == %d > %d\r\n",
120 el->el_refresh.r_cursor.v, el->el_terminal.t_size.v),
125 * Draw c, expanding tabs, control chars etc.
128 re_addc(EditLine *el, wint_t c)
130 switch (ct_chr_class(c)) {
131 case CHTYPE_TAB: /* expand the tab */
134 if ((el->el_refresh.r_cursor.h & 07) == 0)
135 break; /* go until tab stop */
139 int oldv = el->el_refresh.r_cursor.v;
140 re_putc(el, '\0', 0); /* assure end of line */
141 if (oldv == el->el_refresh.r_cursor.v) /* XXX */
149 wchar_t visbuf[VISUAL_WIDTH_MAX];
151 ct_visual_char(visbuf, VISUAL_WIDTH_MAX, c);
152 for (i = 0; n-- > 0; ++i)
153 re_putc(el, visbuf[i], 1);
160 * Place the literal string given
163 re_putliteral(EditLine *el, const wchar_t *begin, const wchar_t *end)
165 coord_t *cur = &el->el_refresh.r_cursor;
167 int sizeh = el->el_terminal.t_size.h;
170 c = literal_add(el, begin, end, &w);
171 if (c == 0 || w <= 0)
173 el->el_vdisplay[cur->v][cur->h] = c;
176 if (i > sizeh - cur->h) /* avoid overflow */
179 el->el_vdisplay[cur->v][cur->h + i] = MB_FILL_CHAR;
182 if (cur->h >= sizeh) {
183 /* assure end of line */
184 el->el_vdisplay[cur->v][sizeh] = '\0';
190 * Draw the character given
193 re_putc(EditLine *el, wint_t c, int shift)
195 coord_t *cur = &el->el_refresh.r_cursor;
196 int i, w = wcwidth(c);
197 int sizeh = el->el_terminal.t_size.h;
199 ELRE_DEBUG(1, (__F, "printing %5x '%lc'\r\n", c, c));
203 while (shift && (cur->h + w > sizeh))
206 el->el_vdisplay[cur->v][cur->h] = c;
207 /* assumes !shift is only used for single-column chars */
210 el->el_vdisplay[cur->v][cur->h + i] = MB_FILL_CHAR;
215 cur->h += w; /* advance to next place */
216 if (cur->h >= sizeh) {
217 /* assure end of line */
218 el->el_vdisplay[cur->v][sizeh] = '\0';
225 * draws the new virtual screen image from the current input
226 * line, then goes line-by-line changing the real image to the new
227 * virtual image. The routine to re-draw a line can be replaced
228 * easily in hopes of a smarter one being placed there.
231 re_refresh(EditLine *el)
240 ELRE_DEBUG(1, (__F, "el->el_line.buffer = :%ls:\r\n",
241 el->el_line.buffer));
244 /* reset the Drawing cursor */
245 el->el_refresh.r_cursor.h = 0;
246 el->el_refresh.r_cursor.v = 0;
248 terminal_move_to_char(el, 0);
250 /* temporarily draw rprompt to calculate its size */
251 prompt_print(el, EL_RPROMPT);
253 /* reset the Drawing cursor */
254 el->el_refresh.r_cursor.h = 0;
255 el->el_refresh.r_cursor.v = 0;
257 if (el->el_line.cursor >= el->el_line.lastchar) {
258 if (el->el_map.current == el->el_map.alt
259 && el->el_line.lastchar != el->el_line.buffer)
260 el->el_line.cursor = el->el_line.lastchar - 1;
262 el->el_line.cursor = el->el_line.lastchar;
265 cur.h = -1; /* set flag in case I'm not set */
268 prompt_print(el, EL_PROMPT);
270 /* draw the current input buffer */
272 termsz = el->el_terminal.t_size.h * el->el_terminal.t_size.v;
273 if (el->el_line.lastchar - el->el_line.buffer > termsz) {
275 * If line is longer than terminal, process only part
276 * of line which would influence display.
278 size_t rem = (el->el_line.lastchar-el->el_line.buffer)%termsz;
280 st = el->el_line.lastchar - rem
281 - (termsz - (((rem / el->el_terminal.t_size.v) - 1)
282 * el->el_terminal.t_size.v));
285 st = el->el_line.buffer;
287 for (cp = st; cp < el->el_line.lastchar; cp++) {
288 if (cp == el->el_line.cursor) {
289 int w = wcwidth(*cp);
291 cur.h = el->el_refresh.r_cursor.h;
292 cur.v = el->el_refresh.r_cursor.v;
293 /* handle being at a linebroken doublewidth char */
294 if (w > 1 && el->el_refresh.r_cursor.h + w >
295 el->el_terminal.t_size.h) {
303 if (cur.h == -1) { /* if I haven't been set yet, I'm at the end */
304 cur.h = el->el_refresh.r_cursor.h;
305 cur.v = el->el_refresh.r_cursor.v;
307 rhdiff = el->el_terminal.t_size.h - el->el_refresh.r_cursor.h -
308 el->el_rprompt.p_pos.h;
309 if (el->el_rprompt.p_pos.h && !el->el_rprompt.p_pos.v &&
310 !el->el_refresh.r_cursor.v && rhdiff > 1) {
312 * have a right-hand side prompt that will fit
313 * on the end of the first line with at least
314 * one character gap to the input buffer.
316 while (--rhdiff > 0) /* pad out with spaces */
318 prompt_print(el, EL_RPROMPT);
320 el->el_rprompt.p_pos.h = 0; /* flag "not using rprompt" */
321 el->el_rprompt.p_pos.v = 0;
324 re_putc(el, '\0', 0); /* make line ended with NUL, no cursor shift */
326 el->el_refresh.r_newcv = el->el_refresh.r_cursor.v;
329 "term.h=%d vcur.h=%d vcur.v=%d vdisplay[0]=\r\n:%80.80s:\r\n",
330 el->el_terminal.t_size.h, el->el_refresh.r_cursor.h,
331 el->el_refresh.r_cursor.v, ct_encode_string(el->el_vdisplay[0],
334 ELRE_DEBUG(1, (__F, "updating %d lines.\r\n", el->el_refresh.r_newcv));
335 for (i = 0; i <= el->el_refresh.r_newcv; i++) {
336 /* NOTE THAT re_update_line MAY CHANGE el_display[i] */
337 re_update_line(el, (wchar_t *)el->el_display[i],
338 (wchar_t *)el->el_vdisplay[i], i);
341 * Copy the new line to be the current one, and pad out with
342 * spaces to the full width of the terminal so that if we try
343 * moving the cursor by writing the character that is at the
344 * end of the screen line, it won't be a NUL or some old
347 re__copy_and_pad((wchar_t *)el->el_display[i],
348 (wchar_t *)el->el_vdisplay[i],
349 (size_t) el->el_terminal.t_size.h);
352 "\r\nel->el_refresh.r_cursor.v=%d,el->el_refresh.r_oldcv=%d i=%d\r\n",
353 el->el_refresh.r_cursor.v, el->el_refresh.r_oldcv, i));
355 if (el->el_refresh.r_oldcv > el->el_refresh.r_newcv)
356 for (; i <= el->el_refresh.r_oldcv; i++) {
357 terminal_move_to_line(el, i);
358 terminal_move_to_char(el, 0);
359 /* This wcslen should be safe even with MB_FILL_CHARs */
360 terminal_clear_EOL(el,
361 (int) wcslen((const wchar_t *)el->el_display[i]));
363 terminal_overwrite(el, L"C\b", 2);
364 #endif /* DEBUG_REFRESH */
365 el->el_display[i][0] = '\0';
368 el->el_refresh.r_oldcv = el->el_refresh.r_newcv; /* set for next time */
370 "\r\ncursor.h = %d, cursor.v = %d, cur.h = %d, cur.v = %d\r\n",
371 el->el_refresh.r_cursor.h, el->el_refresh.r_cursor.v,
373 terminal_move_to_line(el, cur.v); /* go to where the cursor is */
374 terminal_move_to_char(el, cur.h);
379 * used to go to last used screen line
382 re_goto_bottom(EditLine *el)
385 terminal_move_to_line(el, el->el_refresh.r_oldcv);
386 terminal__putc(el, '\n');
387 re_clear_display(el);
393 * insert num characters of s into d (in front of the character)
394 * at dat, maximum length of d is dlen
398 re_insert(EditLine *el __attribute__((__unused__)),
399 wchar_t *d, int dat, int dlen, wchar_t *s, int num)
405 if (num > dlen - dat)
409 (__F, "re_insert() starting: %d at %d max %d, d == \"%s\"\n",
410 num, dat, dlen, ct_encode_string(d, &el->el_scratch)));
411 ELRE_DEBUG(1, (__F, "s == \"%s\"\n", ct_encode_string(s,
414 /* open up the space for num chars */
420 d[dlen] = '\0'; /* just in case */
424 "re_insert() after insert: %d at %d max %d, d == \"%s\"\n",
425 num, dat, dlen, ct_encode_string(d, &el->el_scratch)));
426 ELRE_DEBUG(1, (__F, "s == \"%s\"\n", ct_encode_string(s,
429 /* copy the characters */
430 for (a = d + dat; (a < d + dlen) && (num > 0); num--)
434 /* ct_encode_string() uses a static buffer, so we can't conveniently
435 * encode both d & s here */
437 (__F, "re_insert() after copy: %d at %d max %d, %s == \"%s\"\n",
438 num, dat, dlen, d, s));
439 ELRE_DEBUG(1, (__F, "s == \"%s\"\n", s));
445 * delete num characters d at dat, maximum length of d is dlen
449 re_delete(EditLine *el __attribute__((__unused__)),
450 wchar_t *d, int dat, int dlen, int num)
456 if (dat + num >= dlen) {
461 (__F, "re_delete() starting: %d at %d max %d, d == \"%s\"\n",
462 num, dat, dlen, ct_encode_string(d, &el->el_scratch)));
464 /* open up the space for num chars */
470 d[dlen] = '\0'; /* just in case */
473 (__F, "re_delete() after delete: %d at %d max %d, d == \"%s\"\n",
474 num, dat, dlen, ct_encode_string(d, &el->el_scratch)));
479 * Like strncpy without padding.
482 re__strncopy(wchar_t *a, wchar_t *b, size_t n)
490 * Find the number of characters we need to clear till the end of line
491 * in order to make sure that we have cleared the previous contents of
492 * the line. fx and sx is the number of characters inserted or deleted
493 * in the first or second diff, diff is the difference between the
494 * number of characters between the new and old line.
497 re_clear_eol(EditLine *el, int fx, int sx, int diff)
500 ELRE_DEBUG(1, (__F, "re_clear_eol sx %d, fx %d, diff %d\n",
512 ELRE_DEBUG(1, (__F, "re_clear_eol %d\n", diff));
513 terminal_clear_EOL(el, diff);
516 /*****************************************************************
517 re_update_line() is based on finding the middle difference of each line
520 /old first difference
521 /beginning of line | /old last same /old EOL
523 old: eddie> Oh, my little gruntle-buggy is to me, as lurgid as
524 new: eddie> Oh, my little buggy says to me, as lurgid as
526 \beginning of line | \new last same \new end of line
527 \new first difference
529 all are character pointers for the sake of speed. Special cases for
530 no differences, as well as for end of line additions must be handled.
531 **************************************************************** */
533 /* Minimum at which doing an insert it "worth it". This should be about
534 * half the "cost" of going into insert mode, inserting a character, and
535 * going back out. This should really be calculated from the termcap
536 * data... For the moment, a good number for ANSI terminals.
538 #define MIN_END_KEEP 4
541 re_update_line(EditLine *el, wchar_t *old, wchar_t *new, int i)
543 wchar_t *o, *n, *p, c;
544 wchar_t *ofd, *ols, *oe, *nfd, *nls, *ne;
545 wchar_t *osb, *ose, *nsb, *nse;
552 for (o = old, n = new; *o && (*o == *n); o++, n++)
558 * Find the end of both old and new
563 * Remove any trailing blanks off of the end, being careful not to
564 * back up past the beginning.
577 /* remove blanks from end of new */
587 * if no diff, continue to next line of redraw
589 if (*ofd == '\0' && *nfd == '\0') {
590 ELRE_DEBUG(1, (__F, "no difference.\r\n"));
594 * find last same pointer
596 while ((o > ofd) && (n > nfd) && (*--o == *--n))
602 * find same beginning and same end
610 * case 1: insert: scan from nfd to nls looking for *ofd
613 for (c = *ofd, n = nfd; n < nls; n++) {
616 p < nls && o < ols && *o == *p;
620 * if the new match is longer and it's worth
621 * keeping, then we take it
623 if (((nse - nsb) < (p - n)) &&
624 (2 * (p - n) > n - nfd)) {
634 * case 2: delete: scan from ofd to ols looking for *nfd
637 for (c = *nfd, o = ofd; o < ols; o++) {
640 p < ols && n < nls && *p == *n;
644 * if the new match is longer and it's worth
645 * keeping, then we take it
647 if (((ose - osb) < (p - o)) &&
648 (2 * (p - o) > o - ofd)) {
658 * Pragmatics I: If old trailing whitespace or not enough characters to
659 * save to be worth it, then don't save the last same info.
661 if ((oe - ols) < MIN_END_KEEP) {
666 * Pragmatics II: if the terminal isn't smart enough, make the data
667 * dumber so the smart update doesn't try anything fancy
671 * fx is the number of characters we need to insert/delete: in the
672 * beginning to bring the two same begins together
674 fx = (int)((nsb - nfd) - (osb - ofd));
676 * sx is the number of characters we need to insert/delete: in the
677 * end to bring the two same last parts together
679 sx = (int)((nls - nse) - (ols - ose));
681 if (!EL_CAN_INSERT) {
692 if ((ols - ofd) < (nls - nfd)) {
697 if (!EL_CAN_DELETE) {
708 if ((ols - ofd) > (nls - nfd)) {
714 * Pragmatics III: make sure the middle shifted pointers are correct if
715 * they don't point to anything (we may have moved ols or nls).
717 /* if the change isn't worth it, don't bother */
718 /* was: if (osb == ose) */
719 if ((ose - osb) < MIN_END_KEEP) {
726 * Now that we are done with pragmatics we recompute fx, sx
728 fx = (int)((nsb - nfd) - (osb - ofd));
729 sx = (int)((nls - nse) - (ols - ose));
731 ELRE_DEBUG(1, (__F, "fx %d, sx %d\n", fx, sx));
732 ELRE_DEBUG(1, (__F, "ofd %td, osb %td, ose %td, ols %td, oe %td\n",
733 ofd - old, osb - old, ose - old, ols - old, oe - old));
734 ELRE_DEBUG(1, (__F, "nfd %td, nsb %td, nse %td, nls %td, ne %td\n",
735 nfd - new, nsb - new, nse - new, nls - new, ne - new));
737 "xxx-xxx:\"00000000001111111111222222222233333333334\"\r\n"));
739 "xxx-xxx:\"01234567890123456789012345678901234567890\"\r\n"));
741 re_printstr(el, "old- oe", old, oe);
742 re_printstr(el, "new- ne", new, ne);
743 re_printstr(el, "old-ofd", old, ofd);
744 re_printstr(el, "new-nfd", new, nfd);
745 re_printstr(el, "ofd-osb", ofd, osb);
746 re_printstr(el, "nfd-nsb", nfd, nsb);
747 re_printstr(el, "osb-ose", osb, ose);
748 re_printstr(el, "nsb-nse", nsb, nse);
749 re_printstr(el, "ose-ols", ose, ols);
750 re_printstr(el, "nse-nls", nse, nls);
751 re_printstr(el, "ols- oe", ols, oe);
752 re_printstr(el, "nls- ne", nls, ne);
753 #endif /* DEBUG_REFRESH */
756 * el_cursor.v to this line i MUST be in this routine so that if we
757 * don't have to change the line, we don't move to it. el_cursor.h to
760 terminal_move_to_line(el, i);
763 * at this point we have something like this:
765 * /old /ofd /osb /ose /ols /oe
766 * v.....................v v..................v v........v
767 * eddie> Oh, my fredded gruntle-buggy is to me, as foo var lurgid as
768 * eddie> Oh, my fredded quiux buggy is to me, as gruntle-lurgid as
769 * ^.....................^ ^..................^ ^........^
770 * \new \nfd \nsb \nse \nls \ne
772 * fx is the difference in length between the chars between nfd and
773 * nsb, and the chars between ofd and osb, and is thus the number of
774 * characters to delete if < 0 (new is shorter than old, as above),
775 * or insert (new is longer than short).
777 * sx is the same for the second differences.
781 * if we have a net insert on the first difference, AND inserting the
782 * net amount ((nsb-nfd) - (osb-ofd)) won't push the last useful
783 * character (which is ne if nls != ne, otherwise is nse) off the edge
784 * of the screen (el->el_terminal.t_size.h) else we do the deletes first
785 * so that we keep everything we need to.
789 * if the last same is the same like the end, there is no last same
790 * part, otherwise we want to keep the last same part set p to the
791 * last useful old character
793 p = (ols != oe) ? oe : ose;
796 * if (There is a diffence in the beginning) && (we need to insert
797 * characters) && (the number of characters to insert is less than
799 * We need to do an insert!
800 * else if (we need to delete characters)
801 * We need to delete characters!
803 * No insert or delete
805 if ((nsb != nfd) && fx > 0 &&
806 ((p - old) + fx <= el->el_terminal.t_size.h)) {
808 (__F, "first diff insert at %td...\r\n", nfd - new));
810 * Move to the first char to insert, where the first diff is.
812 terminal_move_to_char(el, (int)(nfd - new));
814 * Check if we have stuff to keep at end
817 ELRE_DEBUG(1, (__F, "with stuff to keep at end\r\n"));
819 * insert fx chars of new starting at nfd
822 ELRE_DEBUG(!EL_CAN_INSERT, (__F,
823 "ERROR: cannot insert in early first diff\n"));
824 terminal_insertwrite(el, nfd, fx);
825 re_insert(el, old, (int)(ofd - old),
826 el->el_terminal.t_size.h, nfd, fx);
829 * write (nsb-nfd) - fx chars of new starting at
832 len = (size_t) ((nsb - nfd) - fx);
833 terminal_overwrite(el, (nfd + fx), len);
834 re__strncopy(ofd + fx, nfd + fx, len);
836 ELRE_DEBUG(1, (__F, "without anything to save\r\n"));
837 len = (size_t)(nsb - nfd);
838 terminal_overwrite(el, nfd, len);
839 re__strncopy(ofd, nfd, len);
847 (__F, "first diff delete at %td...\r\n", ofd - old));
849 * move to the first char to delete where the first diff is
851 terminal_move_to_char(el, (int)(ofd - old));
853 * Check if we have stuff to save
856 ELRE_DEBUG(1, (__F, "with stuff to save at end\r\n"));
858 * fx is less than zero *always* here but we check
862 ELRE_DEBUG(!EL_CAN_DELETE, (__F,
863 "ERROR: cannot delete in first diff\n"));
864 terminal_deletechars(el, -fx);
865 re_delete(el, old, (int)(ofd - old),
866 el->el_terminal.t_size.h, -fx);
869 * write (nsb-nfd) chars of new starting at nfd
871 len = (size_t) (nsb - nfd);
872 terminal_overwrite(el, nfd, len);
873 re__strncopy(ofd, nfd, len);
877 "but with nothing left to save\r\n"));
879 * write (nsb-nfd) chars of new starting at nfd
881 terminal_overwrite(el, nfd, (size_t)(nsb - nfd));
882 re_clear_eol(el, fx, sx,
883 (int)((oe - old) - (ne - new)));
892 if (sx < 0 && (ose - old) + fx < el->el_terminal.t_size.h) {
894 "second diff delete at %td...\r\n", (ose - old) + fx));
896 * Check if we have stuff to delete
899 * fx is the number of characters inserted (+) or deleted (-)
902 terminal_move_to_char(el, (int)((ose - old) + fx));
904 * Check if we have stuff to save
907 ELRE_DEBUG(1, (__F, "with stuff to save at end\r\n"));
909 * Again a duplicate test.
912 ELRE_DEBUG(!EL_CAN_DELETE, (__F,
913 "ERROR: cannot delete in second diff\n"));
914 terminal_deletechars(el, -sx);
917 * write (nls-nse) chars of new starting at nse
919 terminal_overwrite(el, nse, (size_t)(nls - nse));
922 "but with nothing left to save\r\n"));
923 terminal_overwrite(el, nse, (size_t)(nls - nse));
924 re_clear_eol(el, fx, sx,
925 (int)((oe - old) - (ne - new)));
929 * if we have a first insert AND WE HAVEN'T ALREADY DONE IT...
931 if ((nsb != nfd) && (osb - ofd) <= (nsb - nfd) && (fx == 0)) {
932 ELRE_DEBUG(1, (__F, "late first diff insert at %td...\r\n",
935 terminal_move_to_char(el, (int)(nfd - new));
937 * Check if we have stuff to keep at the end
940 ELRE_DEBUG(1, (__F, "with stuff to keep at end\r\n"));
942 * We have to recalculate fx here because we set it
943 * to zero above as a flag saying that we hadn't done
944 * an early first insert.
946 fx = (int)((nsb - nfd) - (osb - ofd));
949 * insert fx chars of new starting at nfd
951 ELRE_DEBUG(!EL_CAN_INSERT, (__F,
952 "ERROR: cannot insert in late first diff\n"));
953 terminal_insertwrite(el, nfd, fx);
954 re_insert(el, old, (int)(ofd - old),
955 el->el_terminal.t_size.h, nfd, fx);
958 * write (nsb-nfd) - fx chars of new starting at
961 len = (size_t) ((nsb - nfd) - fx);
962 terminal_overwrite(el, (nfd + fx), len);
963 re__strncopy(ofd + fx, nfd + fx, len);
965 ELRE_DEBUG(1, (__F, "without anything to save\r\n"));
966 len = (size_t) (nsb - nfd);
967 terminal_overwrite(el, nfd, len);
968 re__strncopy(ofd, nfd, len);
972 * line is now NEW up to nse
976 "second diff insert at %d...\r\n", (int)(nse - new)));
977 terminal_move_to_char(el, (int)(nse - new));
979 ELRE_DEBUG(1, (__F, "with stuff to keep at end\r\n"));
981 /* insert sx chars of new starting at nse */
982 ELRE_DEBUG(!EL_CAN_INSERT, (__F,
983 "ERROR: cannot insert in second diff\n"));
984 terminal_insertwrite(el, nse, sx);
987 * write (nls-nse) - sx chars of new starting at
990 terminal_overwrite(el, (nse + sx),
991 (size_t)((nls - nse) - sx));
993 ELRE_DEBUG(1, (__F, "without anything to save\r\n"));
994 terminal_overwrite(el, nse, (size_t)(nls - nse));
997 * No need to do a clear-to-end here because we were
998 * doing a second insert, so we will have over
999 * written all of the old string.
1003 ELRE_DEBUG(1, (__F, "done.\r\n"));
1007 /* re__copy_and_pad():
1008 * Copy string and pad with spaces
1011 re__copy_and_pad(wchar_t *dst, const wchar_t *src, size_t width)
1015 for (i = 0; i < width; i++) {
1021 for (; i < width; i++)
1028 /* re_refresh_cursor():
1029 * Move to the new cursor position
1031 libedit_private void
1032 re_refresh_cursor(EditLine *el)
1037 if (el->el_line.cursor >= el->el_line.lastchar) {
1038 if (el->el_map.current == el->el_map.alt
1039 && el->el_line.lastchar != el->el_line.buffer)
1040 el->el_line.cursor = el->el_line.lastchar - 1;
1042 el->el_line.cursor = el->el_line.lastchar;
1045 /* first we must find where the cursor is... */
1046 h = el->el_prompt.p_pos.h;
1047 v = el->el_prompt.p_pos.v;
1048 th = el->el_terminal.t_size.h; /* optimize for speed */
1050 /* do input buffer to el->el_line.cursor */
1051 for (cp = el->el_line.buffer; cp < el->el_line.cursor; cp++) {
1052 switch (ct_chr_class(*cp)) {
1053 case CHTYPE_NL: /* handle newline in data part too */
1057 case CHTYPE_TAB: /* if a tab, to next tab stop */
1063 if (w > 1 && h + w > th) { /* won't fit on line */
1067 h += ct_visual_width(*cp);
1071 if (h >= th) { /* check, extra long tabs picked up here also */
1076 /* if we have a next character, and it's a doublewidth one, we need to
1077 * check whether we need to linebreak for it to fit */
1078 if (cp < el->el_line.lastchar && (w = wcwidth(*cp)) > 1)
1085 terminal_move_to_line(el, v);
1086 terminal_move_to_char(el, h);
1087 terminal__flush(el);
1092 * Add a character fast.
1095 re_fastputc(EditLine *el, wint_t c)
1101 while (w > 1 && el->el_cursor.h + w > el->el_terminal.t_size.h)
1102 re_fastputc(el, ' ');
1104 terminal__putc(el, c);
1105 el->el_display[el->el_cursor.v][el->el_cursor.h++] = c;
1107 el->el_display[el->el_cursor.v][el->el_cursor.h++]
1110 if (el->el_cursor.h >= el->el_terminal.t_size.h) {
1111 /* if we must overflow */
1112 el->el_cursor.h = 0;
1115 * If we would overflow (input is longer than terminal size),
1116 * emulate scroll by dropping first line and shuffling the rest.
1117 * We do this via pointer shuffling - it's safe in this case
1118 * and we avoid memcpy().
1120 if (el->el_cursor.v + 1 >= el->el_terminal.t_size.v) {
1121 int i, lins = el->el_terminal.t_size.v;
1123 lastline = el->el_display[0];
1124 for(i = 1; i < lins; i++)
1125 el->el_display[i - 1] = el->el_display[i];
1127 el->el_display[i - 1] = lastline;
1130 lastline = el->el_display[++el->el_refresh.r_oldcv];
1132 re__copy_and_pad((wchar_t *)lastline, L"",
1133 (size_t)el->el_terminal.t_size.h);
1135 if (EL_HAS_AUTO_MARGINS) {
1136 if (EL_HAS_MAGIC_MARGINS) {
1137 terminal__putc(el, ' ');
1138 terminal__putc(el, '\b');
1141 terminal__putc(el, '\r');
1142 terminal__putc(el, '\n');
1149 * we added just one char, handle it fast.
1150 * Assumes that screen cursor == real cursor
1152 libedit_private void
1153 re_fastaddc(EditLine *el)
1158 c = el->el_line.cursor[-1];
1160 if (c == '\t' || el->el_line.cursor != el->el_line.lastchar) {
1161 re_refresh(el); /* too hard to handle */
1164 rhdiff = el->el_terminal.t_size.h - el->el_cursor.h -
1165 el->el_rprompt.p_pos.h;
1166 if (el->el_rprompt.p_pos.h && rhdiff < 3) {
1167 re_refresh(el); /* clear out rprompt if less than 1 char gap */
1169 } /* else (only do at end of line, no TAB) */
1170 switch (ct_chr_class(c)) {
1171 case CHTYPE_TAB: /* already handled, should never happen here */
1177 case CHTYPE_ASCIICTL:
1178 case CHTYPE_NONPRINT: {
1179 wchar_t visbuf[VISUAL_WIDTH_MAX];
1181 ct_visual_char(visbuf, VISUAL_WIDTH_MAX, c);
1182 for (i = 0; n-- > 0; ++i)
1183 re_fastputc(el, visbuf[i]);
1187 terminal__flush(el);
1191 /* re_clear_display():
1192 * clear the screen buffers so that new new prompt starts fresh.
1194 libedit_private void
1195 re_clear_display(EditLine *el)
1199 el->el_cursor.v = 0;
1200 el->el_cursor.h = 0;
1201 for (i = 0; i < el->el_terminal.t_size.v; i++)
1202 el->el_display[i][0] = '\0';
1203 el->el_refresh.r_oldcv = 0;
1207 /* re_clear_lines():
1208 * Make sure all lines are *really* blank
1210 libedit_private void
1211 re_clear_lines(EditLine *el)
1216 for (i = el->el_refresh.r_oldcv; i >= 0; i--) {
1217 /* for each line on the screen */
1218 terminal_move_to_line(el, i);
1219 terminal_move_to_char(el, 0);
1220 terminal_clear_EOL(el, el->el_terminal.t_size.h);
1223 terminal_move_to_line(el, el->el_refresh.r_oldcv);
1224 /* go to last line */
1225 terminal__putc(el, '\r'); /* go to BOL */
1226 terminal__putc(el, '\n'); /* go to new line */