2 * Copyright (c) 1993, 1994
3 * The Regents of the University of California. All rights reserved.
4 * Copyright (c) 1992, 1993, 1994, 1995, 1996
5 * Keith Bostic. All rights reserved.
7 * See the LICENSE file for redistribution information.
13 static const char sccsid[] = "@(#)v_txt.c 10.87 (Berkeley) 10/13/96";
16 #include <sys/types.h>
17 #include <sys/queue.h>
21 #include <bitstring.h>
30 #include "../common/common.h"
33 static int txt_abbrev __P((SCR *, TEXT *, CHAR_T *, int, int *, int *));
34 static void txt_ai_resolve __P((SCR *, TEXT *, int *));
35 static TEXT *txt_backup __P((SCR *, TEXTH *, TEXT *, u_int32_t *));
36 static int txt_dent __P((SCR *, TEXT *, int));
37 static int txt_emark __P((SCR *, TEXT *, size_t));
38 static void txt_err __P((SCR *, TEXTH *));
39 static int txt_fc __P((SCR *, TEXT *, int *));
40 static int txt_fc_col __P((SCR *, int, ARGS **));
41 static int txt_hex __P((SCR *, TEXT *));
42 static int txt_insch __P((SCR *, TEXT *, CHAR_T *, u_int));
43 static int txt_isrch __P((SCR *, VICMD *, TEXT *, u_int8_t *));
44 static int txt_map_end __P((SCR *));
45 static int txt_map_init __P((SCR *));
46 static int txt_margin __P((SCR *, TEXT *, TEXT *, int *, u_int32_t));
47 static void txt_nomorech __P((SCR *));
48 static void txt_Rresolve __P((SCR *, TEXTH *, TEXT *, const size_t));
49 static int txt_resolve __P((SCR *, TEXTH *, u_int32_t));
50 static int txt_showmatch __P((SCR *, TEXT *));
51 static void txt_unmap __P((SCR *, TEXT *, u_int32_t *));
53 /* Cursor character (space is hard to track on the screen). */
54 #if defined(DEBUG) && 0
61 * Fill a buffer from the terminal for vi.
63 * PUBLIC: int v_tcmd __P((SCR *, VICMD *, ARG_CHAR_T, u_int));
66 v_tcmd(sp, vp, prompt, flags)
72 /* Normally, we end up where we started. */
73 vp->m_final.lno = sp->lno;
74 vp->m_final.cno = sp->cno;
76 /* Initialize the map. */
80 /* Move to the last line. */
81 sp->lno = TMAP[0].lno;
84 /* Don't update the modeline for now. */
85 F_SET(sp, SC_TINPUT_INFO);
87 /* Set the input flags. */
88 LF_SET(TXT_APPENDEOL |
89 TXT_CR | TXT_ESCAPE | TXT_INFOLINE | TXT_MAPINPUT);
90 if (O_ISSET(sp, O_ALTWERASE))
91 LF_SET(TXT_ALTWERASE);
92 if (O_ISSET(sp, O_TTYWERASE))
93 LF_SET(TXT_TTYWERASE);
95 /* Do the input thing. */
96 if (v_txt(sp, vp, NULL, NULL, 0, prompt, 0, 1, flags))
99 /* Reenable the modeline updates. */
100 F_CLR(sp, SC_TINPUT_INFO);
102 /* Clean up the map. */
107 F_SET(sp, SC_SCR_REDRAW); /* XXX */
109 /* Set the cursor to the resulting position. */
110 sp->lno = vp->m_final.lno;
111 sp->cno = vp->m_final.cno;
118 * Initialize the screen map for colon command-line input.
128 if (!IS_ONELINE(sp)) {
130 * Fake like the user is doing input on the last line of the
131 * screen. This makes all of the scrolling work correctly,
132 * and allows us the use of the vi text editing routines, not
133 * to mention practically infinite length ex commands.
135 * Save the current location.
137 vip->sv_tm_lno = TMAP->lno;
138 vip->sv_tm_soff = TMAP->soff;
139 vip->sv_tm_coff = TMAP->coff;
140 vip->sv_t_maxrows = sp->t_maxrows;
141 vip->sv_t_minrows = sp->t_minrows;
142 vip->sv_t_rows = sp->t_rows;
145 * If it's a small screen, TMAP may be small for the screen.
146 * Fix it, filling in fake lines as we go.
150 HMAP + (sp->t_maxrows - 1); TMAP < esmp; ++TMAP) {
151 TMAP[1].lno = TMAP[0].lno + 1;
152 TMAP[1].coff = HMAP->coff;
156 /* Build the fake entry. */
157 TMAP[1].lno = TMAP[0].lno + 1;
160 SMAP_FLUSH(&TMAP[1]);
163 /* Reset the screen information. */
164 sp->t_rows = sp->t_minrows = ++sp->t_maxrows;
171 * Reset the screen map for colon command-line input.
181 if (!IS_ONELINE(sp)) {
182 /* Restore the screen information. */
183 sp->t_rows = vip->sv_t_rows;
184 sp->t_minrows = vip->sv_t_minrows;
185 sp->t_maxrows = vip->sv_t_maxrows;
188 * If it's a small screen, TMAP may be wrong. Clear any
189 * lines that might have been overwritten.
192 for (cnt = sp->t_rows; cnt <= sp->t_maxrows; ++cnt) {
193 (void)sp->gp->scr_move(sp, cnt, 0);
194 (void)sp->gp->scr_clrtoeol(sp);
196 TMAP = HMAP + (sp->t_rows - 1);
201 * The map may be wrong if the user entered more than one
202 * (logical) line. Fix it. If the user entered a whole
203 * screen, this will be slow, but we probably don't care.
205 if (!O_ISSET(sp, O_LEFTRIGHT))
206 while (vip->sv_tm_lno != TMAP->lno ||
207 vip->sv_tm_soff != TMAP->soff)
213 * Invalidate the cursor and the line size cache, the line never
214 * really existed. This fixes bugs where the user searches for
215 * the last line on the screen + 1 and the refresh routine thinks
216 * that's where we just were.
219 F_SET(vip, VIP_CUR_INVALID);
225 * If doing input mapping on the colon command line, may need to unmap
226 * based on the command.
229 FL_ISSET(ec_flags, EC_MAPINPUT) && LF_ISSET(TXT_INFOLINE)
232 * Internally, we maintain tp->lno and tp->cno, externally, everyone uses
233 * sp->lno and sp->cno. Make them consistent as necessary.
235 #define UPDATE_POSITION(sp, tp) { \
236 (sp)->lno = (tp)->lno; \
237 (sp)->cno = (tp)->cno; \
244 * PUBLIC: int v_txt __P((SCR *, VICMD *, MARK *,
245 * PUBLIC: const char *, size_t, ARG_CHAR_T, recno_t, u_long, u_int32_t));
248 v_txt(sp, vp, tm, lp, len, prompt, ai_line, rcount, flags)
251 MARK *tm; /* To MARK. */
252 const char *lp; /* Input line. */
253 size_t len; /* Input line length. */
254 ARG_CHAR_T prompt; /* Prompt to display. */
255 recno_t ai_line; /* Line number to use for autoindent count. */
256 u_long rcount; /* Replay count. */
257 u_int32_t flags; /* TXT_* flags. */
259 EVENT ev, *evp; /* Current event. */
260 EVENT fc; /* File name completion event. */
262 TEXT *ntp, *tp; /* Input text structures. */
263 TEXT ait; /* Autoindent text structure. */
264 TEXT wmt; /* Wrapmargin text structure. */
267 abb_t abb; /* State of abbreviation checks. */
268 carat_t carat; /* State of the "[^0]^D" sequences. */
269 quote_t quote; /* State of quotation. */
270 size_t owrite, insert; /* Temporary copies of TEXT fields. */
271 size_t margin; /* Wrapmargin value. */
272 size_t rcol; /* 0-N: insert offset in the replay buffer. */
273 size_t tcol; /* Temporary column. */
274 u_int32_t ec_flags; /* Input mapping flags. */
275 #define IS_RESTART 0x01 /* Reset the incremental search. */
276 #define IS_RUNNING 0x02 /* Incremental search turned on. */
278 int abcnt, ab_turnoff; /* Abbreviation character count, switch. */
279 int filec_redraw; /* Redraw after the file completion routine. */
280 int hexcnt; /* Hex character count. */
281 int showmatch; /* Showmatch set on this character. */
282 int wm_set, wm_skip; /* Wrapmargin happened, blank skip flags. */
290 * Set the input flag, so tabs get displayed correctly
291 * and everyone knows that the text buffer is in use.
293 F_SET(sp, SC_TINPUT);
296 * Get one TEXT structure with some initial buffer space, reusing
297 * the last one if it's big enough. (All TEXT bookkeeping fields
298 * default to 0 -- text_init() handles this.) If changing a line,
299 * copy it into the TEXT buffer.
302 if (tiqh->cqh_first != (void *)tiqh) {
303 tp = tiqh->cqh_first;
304 if (tp->q.cqe_next != (void *)tiqh || tp->lb_len < len + 32) {
308 tp->ai = tp->insert = tp->offset = tp->owrite = 0;
311 memmove(tp->lb, lp, len);
315 newtp: if ((tp = text_init(sp, lp, len, len + 32)) == NULL)
317 CIRCLEQ_INSERT_HEAD(tiqh, tp, q);
320 /* Set default termination condition. */
323 /* Set the starting line, column. */
328 * Set the insert and overwrite counts. If overwriting characters,
329 * do insertion afterward. If not overwriting characters, assume
330 * doing insertion. If change is to a mark, emphasize it with an
331 * CH_ENDMARK character.
334 if (LF_ISSET(TXT_OVERWRITE)) {
335 tp->owrite = (tm->cno - tp->cno) + 1;
336 tp->insert = (len - tm->cno) - 1;
338 tp->insert = len - tp->cno;
340 if (LF_ISSET(TXT_EMARK) && txt_emark(sp, tp, tm->cno))
345 * Many of the special cases in text input are to handle autoindent
346 * support. Somebody decided that it would be a good idea if "^^D"
347 * and "0^D" deleted all of the autoindented characters. In an editor
348 * that takes single character input from the user, this beggars the
349 * imagination. Note also, "^^D" resets the next lines' autoindent,
352 * We assume that autoindent only happens on empty lines, so insert
353 * and overwrite will be zero. If doing autoindent, figure out how
354 * much indentation we need and fill it in. Update input column and
355 * screen cursor as necessary.
357 if (LF_ISSET(TXT_AUTOINDENT) && ai_line != OOBLNO) {
358 if (v_txt_auto(sp, ai_line, NULL, 0, tp))
363 * The cc and S commands have a special feature -- leading
364 * <blank> characters are handled as autoindent characters.
367 if (LF_ISSET(TXT_AICHARS)) {
371 tp->offset = tp->cno;
374 /* If getting a command buffer from the user, there may be a prompt. */
375 if (LF_ISSET(TXT_PROMPT)) {
376 tp->lb[tp->cno++] = prompt;
382 * If appending after the end-of-line, add a space into the buffer
383 * and move the cursor right. This space is inserted, i.e. pushed
384 * along, and then deleted when the line is resolved. Assumes that
385 * the cursor is already positioned at the end of the line. This
386 * avoids the nastiness of having the cursor reside on a magical
387 * column, i.e. a column that doesn't really exist. The only down
388 * side is that we may wrap lines or scroll the screen before it's
389 * strictly necessary. Not a big deal.
391 if (LF_ISSET(TXT_APPENDEOL)) {
392 tp->lb[tp->cno] = CH_CURSOR;
395 (void)vs_change(sp, tp->lno, LINE_RESET);
399 * Historic practice is that the wrapmargin value was a distance
400 * from the RIGHT-HAND margin, not the left. It's more useful to
401 * us as a distance from the left-hand margin, i.e. the same as
402 * the wraplen value. The wrapmargin option is historic practice.
403 * Nvi added the wraplen option so that it would be possible to
404 * edit files with consistent margins without knowing the number of
405 * columns in the window.
408 * Setting margin causes a significant performance hit. Normally
409 * we don't update the screen if there are keys waiting, but we
410 * have to if margin is set, otherwise the screen routines don't
411 * know where the cursor is.
414 * Abbreviated keys were affected by the wrapmargin option in the
415 * historic 4BSD vi. Mapped keys were usually, but sometimes not.
416 * See the comment in vi/v_text():set_txt_std for more information.
419 * One more special case. If an inserted <blank> character causes
420 * wrapmargin to split the line, the next user entered character is
421 * discarded if it's a <space> character.
423 wm_set = wm_skip = 0;
424 if (LF_ISSET(TXT_WRAPMARGIN))
425 if ((margin = O_VAL(sp, O_WRAPMARGIN)) != 0)
426 margin = sp->cols - margin;
428 margin = O_VAL(sp, O_WRAPLEN);
432 /* Initialize abbreviation checks. */
433 abcnt = ab_turnoff = 0;
434 abb = F_ISSET(gp, G_ABBREV) &&
435 LF_ISSET(TXT_MAPINPUT) ? AB_INWORD : AB_NOTSET;
438 * Set up the dot command. Dot commands are done by saving the actual
439 * characters and then reevaluating them so that things like wrapmargin
440 * can change between the insert and the replay.
443 * Historically, vi did not remap or reabbreviate replayed input. (It
444 * did beep at you if you changed an abbreviation and then replayed the
445 * input. We're not that compatible.) We don't have to do anything to
446 * avoid remapping, as we're not getting characters from the terminal
447 * routines. Turn the abbreviation check off.
450 * It would be nice if we could swallow backspaces and such, but it's
451 * not all that easy to do. What we can do is turn off the common
452 * error messages during the replay. Otherwise, when the user enters
453 * an illegal command, e.g., "Ia<erase><erase><erase><erase>b<escape>",
454 * and then does a '.', they get a list of error messages after command
458 if (LF_ISSET(TXT_REPLAY)) {
463 /* Other text input mode setup. */
467 LF_ISSET(TXT_SEARCHINCR) ? IS_RESTART | IS_RUNNING : 0);
468 filec_redraw = hexcnt = showmatch = 0;
470 /* Initialize input flags. */
471 ec_flags = LF_ISSET(TXT_MAPINPUT) ? EC_MAPINPUT : 0;
473 /* Refresh the screen. */
474 UPDATE_POSITION(sp, tp);
475 if (vs_refresh(sp, 1))
478 /* If it's dot, just do it now. */
479 if (F_ISSET(vp, VC_ISDOT))
484 next: if (v_event_get(sp, evp, 0, ec_flags))
488 * If file completion overwrote part of the screen and nothing else has
489 * been displayed, clean up. We don't do this as part of the normal
490 * message resolution because we know the user is on the colon command
491 * line and there's no reason to enter explicit characters to continue.
493 if (filec_redraw && !F_ISSET(sp, SC_SCR_EXWROTE)) {
496 fc.e_event = E_REPAINT;
497 fc.e_flno = vip->totalcount >=
498 sp->rows ? 1 : sp->rows - vip->totalcount;
499 fc.e_tlno = sp->rows;
500 vip->linecount = vip->lcontinue = vip->totalcount = 0;
501 (void)vs_repaint(sp, &fc);
502 (void)vs_refresh(sp, 1);
505 /* Deal with all non-character events. */
506 switch (evp->e_event) {
511 F_SET(sp, SC_EXIT_FORCE);
516 * Historically, <interrupt> exited the user from text input
517 * mode or cancelled a colon command, and returned to command
518 * mode. It also beeped the terminal, but that seems a bit
523 if (vs_repaint(sp, &ev))
527 /* <resize> interrupts the input mode. */
528 v_emsg(sp, NULL, VIM_WRESIZE);
531 v_event_err(sp, evp);
537 * If the first character of the input is a nul, replay the previous
538 * input. (Historically, it's okay to replay non-existent input.)
539 * This was not documented as far as I know, and is a great test of vi
542 if (rcol == 0 && !LF_ISSET(TXT_REPLAY) && evp->e_c == '\0') {
543 if (vip->rep == NULL)
553 * File name completion and colon command-line editing. We don't
554 * have enough meta characters, so we expect people to overload
555 * them. If the two characters are the same, then we do file name
556 * completion if the cursor is past the first column, and do colon
557 * command-line editing if it's not.
559 if (quote == Q_NOTSET) {
560 int L__cedit, L__filec;
562 L__cedit = L__filec = 0;
563 if (LF_ISSET(TXT_CEDIT) && O_STR(sp, O_CEDIT) != NULL &&
564 O_STR(sp, O_CEDIT)[0] == evp->e_c)
566 if (LF_ISSET(TXT_FILEC) && O_STR(sp, O_FILEC) != NULL &&
567 O_STR(sp, O_FILEC)[0] == evp->e_c)
569 if (L__cedit == 1 && (L__filec == 0 || tp->cno == tp->offset)) {
570 tp->term = TERM_CEDIT;
574 if (txt_fc(sp, tp, &filec_redraw))
580 /* Abbreviation overflow check. See comment in txt_abbrev(). */
581 #define MAX_ABBREVIATION_EXPANSION 256
582 if (F_ISSET(&evp->e_ch, CH_ABBREVIATED)) {
583 if (++abcnt > MAX_ABBREVIATION_EXPANSION) {
584 if (v_event_flush(sp, CH_ABBREVIATED))
586 "191|Abbreviation exceeded expansion limit: characters discarded");
588 if (LF_ISSET(TXT_REPLAY))
595 /* Check to see if the character fits into the replay buffers. */
596 if (LF_ISSET(TXT_RECORD)) {
597 BINC_GOTO(sp, vip->rep,
598 vip->rep_len, (rcol + 1) * sizeof(EVENT));
599 vip->rep[rcol++] = *evp;
602 replay: if (LF_ISSET(TXT_REPLAY))
603 evp = vip->rep + rcol++;
605 /* Wrapmargin check for leading space. */
612 /* If quoted by someone else, simply insert the character. */
613 if (F_ISSET(&evp->e_ch, CH_QUOTED))
618 * If this character was quoted by a K_VLNEXT or a backslash, replace
619 * the placeholder (a carat or a backslash) with the new character.
620 * If it was quoted by a K_VLNEXT, we've already adjusted the cursor
621 * because it has to appear on top of the placeholder character. If
622 * it was quoted by a backslash, adjust the cursor now, the cursor
623 * doesn't appear on top of it. Historic practice in both cases.
625 * Skip tests for abbreviations; ":ab xa XA" followed by "ixa^V<space>"
626 * doesn't perform an abbreviation. Special case, ^V^J (not ^V^M) is
627 * the same as ^J, historically.
629 if (quote == Q_BTHIS || quote == Q_VTHIS) {
630 FL_CLR(ec_flags, EC_QUOTED);
631 if (LF_ISSET(TXT_MAPINPUT))
632 FL_SET(ec_flags, EC_MAPINPUT);
634 if (quote == Q_BTHIS &&
635 (evp->e_value == K_VERASE || evp->e_value == K_VKILL)) {
641 if (quote == Q_VTHIS && evp->e_value != K_NL) {
650 * Translate "<CH_HEX>[isxdigit()]*" to a character with a hex value:
651 * this test delimits the value by any non-hex character. Offset by
652 * one, we use 0 to mean that we've found <CH_HEX>.
654 if (hexcnt > 1 && !isxdigit(evp->e_c)) {
660 switch (evp->e_value) {
661 case K_CR: /* Carriage return. */
662 case K_NL: /* New line. */
663 /* Return in script windows and the command line. */
664 k_cr: if (LF_ISSET(TXT_CR)) {
666 * If this was a map, we may have not displayed
667 * the line. Display it, just in case.
669 * If a script window and not the colon line,
670 * push a <cr> so it gets executed.
672 if (LF_ISSET(TXT_INFOLINE)) {
673 if (vs_change(sp, tp->lno, LINE_RESET))
675 } else if (F_ISSET(sp, SC_SCRIPT))
676 (void)v_event_push(sp, NULL, "\r", 1, CH_NOMAP);
678 /* Set term condition: if empty. */
679 if (tp->cno <= tp->offset)
682 * Set term condition: if searching incrementally and
683 * the user entered a pattern, return a completed
684 * search, regardless if the entire pattern was found.
686 if (FL_ISSET(is_flags, IS_RUNNING) &&
687 tp->cno >= tp->offset + 1)
688 tp->term = TERM_SEARCH;
693 #define LINE_RESOLVE { \
695 * Handle abbreviations. If there was one, discard the \
696 * replay characters. \
698 if (abb == AB_INWORD && \
699 !LF_ISSET(TXT_REPLAY) && F_ISSET(gp, G_ABBREV)) { \
700 if (txt_abbrev(sp, tp, &evp->e_c, \
701 LF_ISSET(TXT_INFOLINE), &tmp, \
705 if (LF_ISSET(TXT_RECORD)) \
710 if (abb != AB_NOTSET) \
713 txt_unmap(sp, tp, &ec_flags); \
715 * Delete any appended cursor. It's possible to get in \
716 * situations where TXT_APPENDEOL is set but tp->insert \
717 * is 0 when using the R command and all the characters \
718 * are tp->owrite characters. \
720 if (LF_ISSET(TXT_APPENDEOL) && tp->insert > 0) { \
728 * Save the current line information for restoration in
729 * txt_backup(), and set the line final length.
731 tp->sv_len = tp->len;
732 tp->sv_cno = tp->cno;
735 /* Update the old line. */
736 if (vs_change(sp, tp->lno, LINE_RESET))
740 * Historic practice, when the autoindent edit option was set,
741 * was to delete <blank> characters following the inserted
742 * newline. This affected the 'R', 'c', and 's' commands; 'c'
743 * and 's' retained the insert characters only, 'R' moved the
744 * overwrite and insert characters into the next TEXT structure.
745 * We keep track of the number of characters erased for the 'R'
746 * command so that the final resolution of the line is correct.
751 if (LF_ISSET(TXT_REPLACE) && owrite != 0) {
752 for (p = tp->lb + tp->cno; owrite > 0 && isblank(*p);
753 ++p, --owrite, ++tp->R_erase);
755 for (; insert > 0 && isblank(*p);
756 ++p, ++tp->R_erase, --insert);
758 p = tp->lb + tp->cno + owrite;
759 if (O_ISSET(sp, O_AUTOINDENT))
761 isblank(*p); ++p, --insert);
767 * Create a new line and insert the new TEXT into the queue.
768 * DON'T insert until the old line has been updated, or the
769 * inserted line count in line.c:db_get() will be wrong.
771 if ((ntp = text_init(sp, p,
772 insert + owrite, insert + owrite + 32)) == NULL)
774 CIRCLEQ_INSERT_TAIL(&sp->tiq, ntp, q);
776 /* Set up bookkeeping for the new line. */
777 ntp->insert = insert;
778 ntp->owrite = owrite;
779 ntp->lno = tp->lno + 1;
782 * Reset the autoindent line value. 0^D keeps the autoindent
783 * line from changing, ^D changes the level, even if there were
784 * no characters in the old line. Note, if using the current
785 * tp structure, use the cursor as the length, the autoindent
786 * characters may have been erased.
788 if (LF_ISSET(TXT_AUTOINDENT)) {
789 if (carat == C_NOCHANGE) {
790 if (v_txt_auto(sp, OOBLNO, &ait, ait.ai, ntp))
792 FREE_SPACE(sp, ait.lb, ait.lb_len);
794 if (v_txt_auto(sp, OOBLNO, tp, tp->cno, ntp))
799 /* Reset the cursor. */
803 * If we're here because wrapmargin was set and we've broken a
804 * line, there may be additional information (i.e. the start of
805 * a line) in the wmt structure.
808 if (wmt.offset != 0 ||
809 wmt.owrite != 0 || wmt.insert != 0) {
810 #define WMTSPACE wmt.offset + wmt.owrite + wmt.insert
811 BINC_GOTO(sp, ntp->lb,
812 ntp->lb_len, ntp->len + WMTSPACE + 32);
813 memmove(ntp->lb + ntp->cno, wmt.lb, WMTSPACE);
814 ntp->len += WMTSPACE;
815 ntp->cno += wmt.offset;
816 ntp->owrite = wmt.owrite;
817 ntp->insert = wmt.insert;
822 /* New lines are TXT_APPENDEOL. */
823 if (ntp->owrite == 0 && ntp->insert == 0) {
824 BINC_GOTO(sp, ntp->lb, ntp->lb_len, ntp->len + 1);
825 LF_SET(TXT_APPENDEOL);
826 ntp->lb[ntp->cno] = CH_CURSOR;
831 /* Swap old and new TEXT's, and update the new line. */
833 if (vs_change(sp, tp->lno, LINE_INSERT))
837 case K_ESCAPE: /* Escape. */
838 if (!LF_ISSET(TXT_ESCAPE))
841 /* If we have a count, start replaying the input. */
851 * Some commands (e.g. 'o') need a <newline> for each
854 if (LF_ISSET(TXT_ADDNEWLINE))
858 * The R command turns into the 'a' command after the
861 if (LF_ISSET(TXT_REPLACE)) {
862 tp->insert = tp->owrite;
869 /* Set term condition: if empty. */
870 if (tp->cno <= tp->offset)
873 * Set term condition: if searching incrementally and the user
874 * entered a pattern, return a completed search, regardless if
875 * the entire pattern was found.
877 if (FL_ISSET(is_flags, IS_RUNNING) && tp->cno >= tp->offset + 1)
878 tp->term = TERM_SEARCH;
880 k_escape: LINE_RESOLVE;
883 * Clean up for the 'R' command, restoring overwrite
884 * characters, and making them into insert characters.
886 if (LF_ISSET(TXT_REPLACE))
887 txt_Rresolve(sp, &sp->tiq, tp, len);
890 * If there are any overwrite characters, copy down
891 * any insert characters, and decrement the length.
895 memmove(tp->lb + tp->cno,
896 tp->lb + tp->cno + tp->owrite, tp->insert);
897 tp->len -= tp->owrite;
901 * Optionally resolve the lines into the file. If not
902 * resolving the lines into the file, end the line with
903 * a nul. If the line is empty, then set the length to
904 * 0, the termination condition has already been set.
907 * This is wrong, should pass back a length.
909 if (LF_ISSET(TXT_RESOLVE)) {
910 if (txt_resolve(sp, &sp->tiq, flags))
913 BINC_GOTO(sp, tp->lb, tp->lb_len, tp->len + 1);
914 tp->lb[tp->len] = '\0';
918 * Set the return cursor position to rest on the last
919 * inserted character.
924 /* Update the last line. */
925 if (vs_change(sp, tp->lno, LINE_RESET))
928 case K_CARAT: /* Delete autoindent chars. */
929 if (tp->cno <= tp->ai && LF_ISSET(TXT_AUTOINDENT))
932 case K_ZERO: /* Delete autoindent chars. */
933 if (tp->cno <= tp->ai && LF_ISSET(TXT_AUTOINDENT))
936 case K_CNTRLD: /* Delete autoindent char. */
938 * If in the first column or no characters to erase, ignore
939 * the ^D (this matches historic practice). If not doing
940 * autoindent or already inserted non-ai characters, it's a
941 * literal. The latter test is done in the switch, as the
942 * CARAT forms are N + 1, not N.
944 if (!LF_ISSET(TXT_AUTOINDENT))
950 case C_CARATSET: /* ^^D */
951 if (tp->ai == 0 || tp->cno > tp->ai + tp->offset + 1)
954 /* Save the ai string for later. */
957 BINC_GOTO(sp, ait.lb, ait.lb_len, tp->ai);
958 memmove(ait.lb, tp->lb, tp->ai);
959 ait.ai = ait.len = tp->ai;
963 case C_ZEROSET: /* 0^D */
964 if (tp->ai == 0 || tp->cno > tp->ai + tp->offset + 1)
968 leftmargin: tp->lb[tp->cno - 1] = ' ';
969 tp->owrite += tp->cno - tp->offset;
971 tp->cno = tp->offset;
973 case C_NOTSET: /* ^D */
974 if (tp->ai == 0 || tp->cno > tp->ai + tp->offset)
977 (void)txt_dent(sp, tp, 0);
983 case K_VERASE: /* Erase the last character. */
984 /* If can erase over the prompt, return. */
985 if (tp->cno <= tp->offset && LF_ISSET(TXT_BS)) {
991 * If at the beginning of the line, try and drop back to a
992 * previously inserted line.
996 txt_backup(sp, &sp->tiq, tp, &flags)) == NULL)
1002 /* If nothing to erase, bell the user. */
1003 if (tp->cno <= tp->offset) {
1004 if (!LF_ISSET(TXT_REPLAY))
1009 /* Drop back one character. */
1013 * Historically, vi didn't replace the erased characters with
1014 * <blank>s, presumably because it's easier to fix a minor
1015 * typing mistake and continue on if the previous letters are
1016 * already there. This is a problem for incremental searching,
1017 * because the user can no longer tell where they are in the
1018 * colon command line because the cursor is at the last search
1019 * point in the screen. So, if incrementally searching, erase
1020 * the erased characters from the screen.
1022 if (FL_ISSET(is_flags, IS_RUNNING))
1023 tp->lb[tp->cno] = ' ';
1026 * Increment overwrite, decrement ai if deleted.
1029 * Historic vi did not permit users to use erase characters
1030 * to delete autoindent characters. We do. Eat hot death,
1034 if (tp->cno < tp->ai)
1037 /* Reset if we deleted an incremental search character. */
1038 if (FL_ISSET(is_flags, IS_RUNNING))
1039 FL_SET(is_flags, IS_RESTART);
1041 case K_VWERASE: /* Skip back one word. */
1043 * If at the beginning of the line, try and drop back to a
1044 * previously inserted line.
1048 txt_backup(sp, &sp->tiq, tp, &flags)) == NULL)
1054 * If at offset, nothing to erase so bell the user.
1056 if (tp->cno <= tp->offset) {
1057 if (!LF_ISSET(TXT_REPLAY))
1063 * The first werase goes back to any autoindent column and the
1064 * second werase goes back to the offset.
1067 * Historic vi did not permit users to use erase characters to
1068 * delete autoindent characters.
1070 if (tp->ai && tp->cno > tp->ai)
1077 /* Skip over trailing space characters. */
1078 while (tp->cno > max && isblank(tp->lb[tp->cno - 1])) {
1085 * There are three types of word erase found on UNIX systems.
1086 * They can be identified by how the string /a/b/c is treated
1087 * -- as 1, 3, or 6 words. Historic vi had two classes of
1088 * characters, and strings were delimited by them and
1089 * <blank>'s, so, 6 words. The historic tty interface used
1090 * <blank>'s to delimit strings, so, 1 word. The algorithm
1091 * offered in the 4.4BSD tty interface (as stty altwerase)
1092 * treats it as 3 words -- there are two classes of
1093 * characters, and strings are delimited by them and
1094 * <blank>'s. The difference is that the type of the first
1095 * erased character erased is ignored, which is exactly right
1096 * when erasing pathname components. The edit options
1097 * TXT_ALTWERASE and TXT_TTYWERASE specify the 4.4BSD tty
1098 * interface and the historic tty driver behavior,
1099 * respectively, and the default is the same as the historic
1102 * Overwrite erased characters if doing incremental search;
1103 * see comment above.
1105 if (LF_ISSET(TXT_TTYWERASE))
1106 while (tp->cno > max) {
1109 if (FL_ISSET(is_flags, IS_RUNNING))
1110 tp->lb[tp->cno] = ' ';
1111 if (isblank(tp->lb[tp->cno - 1]))
1115 if (LF_ISSET(TXT_ALTWERASE)) {
1118 if (FL_ISSET(is_flags, IS_RUNNING))
1119 tp->lb[tp->cno] = ' ';
1120 if (isblank(tp->lb[tp->cno - 1]))
1124 tmp = inword(tp->lb[tp->cno - 1]);
1125 while (tp->cno > max) {
1128 if (FL_ISSET(is_flags, IS_RUNNING))
1129 tp->lb[tp->cno] = ' ';
1130 if (tmp != inword(tp->lb[tp->cno - 1])
1131 || isblank(tp->lb[tp->cno - 1]))
1136 /* Reset if we deleted an incremental search character. */
1137 if (FL_ISSET(is_flags, IS_RUNNING))
1138 FL_SET(is_flags, IS_RESTART);
1140 case K_VKILL: /* Restart this line. */
1143 * If at the beginning of the line, try and drop back to a
1144 * previously inserted line. Historic vi did not permit
1145 * users to go back to previous lines.
1149 txt_backup(sp, &sp->tiq, tp, &flags)) == NULL)
1154 /* If at offset, nothing to erase so bell the user. */
1155 if (tp->cno <= tp->offset) {
1156 if (!LF_ISSET(TXT_REPLAY))
1162 * First kill goes back to any autoindent and second kill goes
1163 * back to the offset.
1166 * Historic vi did not permit users to use erase characters to
1167 * delete autoindent characters.
1169 if (tp->ai && tp->cno > tp->ai)
1175 tp->owrite += tp->cno - max;
1178 * Overwrite erased characters if doing incremental search;
1179 * see comment above.
1181 if (FL_ISSET(is_flags, IS_RUNNING))
1183 tp->lb[--tp->cno] = ' ';
1184 } while (tp->cno > max);
1188 /* Reset if we deleted an incremental search character. */
1189 if (FL_ISSET(is_flags, IS_RUNNING))
1190 FL_SET(is_flags, IS_RESTART);
1192 case K_CNTRLT: /* Add autoindent characters. */
1193 if (!LF_ISSET(TXT_CNTRLT))
1195 if (txt_dent(sp, tp, 1))
1200 if (LF_ISSET(TXT_SHOWMATCH))
1203 case K_BACKSLASH: /* Quote next erase/kill. */
1206 * Historic vi tried to make abbreviations after a backslash
1207 * escape work. If you did ":ab x y", and inserted "x\^H",
1208 * (assuming the erase character was ^H) you got "x^H", and
1209 * no abbreviation was done. If you inserted "x\z", however,
1210 * it tried to back up and do the abbreviation, i.e. replace
1211 * 'x' with 'y'. The problem was it got it wrong, and you
1212 * ended up with "zy\".
1214 * This is really hard to do (you have to remember the
1215 * word/non-word state, for example), and doesn't make any
1216 * sense to me. Both backslash and the characters it
1217 * (usually) escapes will individually trigger the
1218 * abbreviation, so I don't see why the combination of them
1219 * wouldn't. I don't expect to get caught on this one,
1220 * particularly since it never worked right, but I've been
1223 * Do the tests for abbreviations, so ":ab xa XA",
1224 * "ixa\<K_VERASE>" performs the abbreviation.
1228 case K_VLNEXT: /* Quote next character. */
1232 * Turn on the quote flag so that the underlying routines
1233 * quote the next character where it's possible. Turn off
1234 * the input mapbiting flag so that we don't remap the next
1237 FL_SET(ec_flags, EC_QUOTED);
1238 FL_CLR(ec_flags, EC_MAPINPUT);
1242 * Skip the tests for abbreviations, so ":ab xa XA",
1243 * "ixa^V<space>" doesn't perform the abbreviation.
1249 default: /* Insert the character. */
1251 * Historically, vi eliminated nul's out of hand. If the
1252 * beautify option was set, it also deleted any unknown
1253 * ASCII value less than space (040) and the del character
1254 * (0177), except for tabs. Unknown is a key word here.
1255 * Most vi documentation claims that it deleted everything
1256 * but <tab>, <nl> and <ff>, as that's what the original
1257 * 4BSD documentation said. This is obviously wrong,
1258 * however, as <esc> would be included in that list. What
1259 * we do is eliminate any unquoted, iscntrl() character that
1260 * wasn't a replay and wasn't handled specially, except
1263 if (LF_ISSET(TXT_BEAUTIFY) && iscntrl(evp->e_c) &&
1264 evp->e_value != K_FORMFEED && evp->e_value != K_TAB) {
1266 "192|Illegal character; quote to enter");
1267 if (LF_ISSET(TXT_REPLAY))
1273 * If entering a non-word character after a word, check for
1274 * abbreviations. If there was one, discard replay characters.
1275 * If entering a blank character, check for unmap commands,
1278 if (!inword(evp->e_c)) {
1279 if (abb == AB_INWORD &&
1280 !LF_ISSET(TXT_REPLAY) && F_ISSET(gp, G_ABBREV)) {
1281 if (txt_abbrev(sp, tp, &evp->e_c,
1282 LF_ISSET(TXT_INFOLINE), &tmp, &ab_turnoff))
1285 if (LF_ISSET(TXT_RECORD))
1290 if (isblank(evp->e_c) && UNMAP_TST)
1291 txt_unmap(sp, tp, &ec_flags);
1293 if (abb != AB_NOTSET)
1294 abb = inword(evp->e_c) ? AB_INWORD : AB_NOTWORD;
1296 insl_ch: if (txt_insch(sp, tp, &evp->e_c, flags))
1300 * If we're using K_VLNEXT to quote the next character, then
1301 * we want the cursor to position itself on the ^ placeholder
1302 * we're displaying, to match historic practice.
1304 if (quote == Q_VNEXT) {
1311 * Translate "<CH_HEX>[isxdigit()]*" to a character with
1312 * a hex value: this test delimits the value by the max
1313 * number of hex bytes. Offset by one, we use 0 to mean
1314 * that we've found <CH_HEX>.
1316 if (hexcnt != 0 && hexcnt++ == sizeof(CHAR_T) * 2 + 1) {
1318 if (txt_hex(sp, tp))
1323 * Check to see if we've crossed the margin.
1326 * In the historic vi, the wrapmargin value was figured out
1327 * using the display widths of the characters, i.e. <tab>
1328 * characters were counted as two characters if the list edit
1329 * option is set, but as the tabstop edit option number of
1330 * characters otherwise. That's what the vs_column() function
1331 * gives us, so we use it.
1334 if (vs_column(sp, &tcol))
1336 if (tcol >= margin) {
1337 if (txt_margin(sp, tp, &wmt, &tmp, flags))
1340 if (isblank(evp->e_c))
1349 * If we've reached the end of the buffer, then we need to
1350 * switch into insert mode. This happens when there's a
1351 * change to a mark and the user puts in more characters than
1352 * the length of the motion.
1354 ebuf_chk: if (tp->cno >= tp->len) {
1355 BINC_GOTO(sp, tp->lb, tp->lb_len, tp->len + 1);
1356 LF_SET(TXT_APPENDEOL);
1358 tp->lb[tp->cno] = CH_CURSOR;
1363 /* Step the quote state forward. */
1364 if (quote != Q_NOTSET) {
1365 if (quote == Q_BNEXT)
1367 if (quote == Q_VNEXT)
1374 if (tp->cno + tp->insert + tp->owrite != tp->len) {
1376 "len %u != cno: %u ai: %u insert %u overwrite %u",
1377 tp->len, tp->cno, tp->ai, tp->insert, tp->owrite);
1378 if (LF_ISSET(TXT_REPLAY))
1380 tp->len = tp->cno + tp->insert + tp->owrite;
1385 * 1: If we don't need to know where the cursor really is and we're
1386 * replaying text, keep going.
1388 if (margin == 0 && LF_ISSET(TXT_REPLAY))
1392 * 2: Reset the line. Don't bother unless we're about to wait on
1393 * a character or we need to know where the cursor really is.
1394 * We have to do this before showing matching characters so the
1395 * user can see what they're matching.
1397 if ((margin != 0 || !KEYS_WAITING(sp)) &&
1398 vs_change(sp, tp->lno, LINE_RESET))
1402 * 3: If there aren't keys waiting, display the matching character.
1403 * We have to do this before resolving any messages, otherwise
1404 * the error message from a missing match won't appear correctly.
1407 if (!KEYS_WAITING(sp) && txt_showmatch(sp, tp))
1413 * 4: If there have been messages and we're not editing on the colon
1414 * command line or doing file name completion, resolve them.
1416 if ((vip->totalcount != 0 || F_ISSET(gp, G_BELLSCHED)) &&
1417 !F_ISSET(sp, SC_TINPUT_INFO) && !filec_redraw &&
1418 vs_resolve(sp, NULL, 0))
1422 * 5: Refresh the screen if we're about to wait on a character or we
1423 * need to know where the cursor really is.
1425 if (margin != 0 || !KEYS_WAITING(sp)) {
1426 UPDATE_POSITION(sp, tp);
1427 if (vs_refresh(sp, margin != 0))
1431 /* 6: Proceed with the incremental search. */
1432 if (FL_ISSET(is_flags, IS_RUNNING) && txt_isrch(sp, vp, tp, &is_flags))
1435 /* 7: Next character... */
1436 if (LF_ISSET(TXT_REPLAY))
1440 done: /* Leave input mode. */
1441 F_CLR(sp, SC_TINPUT);
1443 /* If recording for playback, save it. */
1444 if (LF_ISSET(TXT_RECORD))
1445 vip->rep_cnt = rcol;
1448 * If not working on the colon command line, set the final cursor
1451 if (!F_ISSET(sp, SC_TINPUT_INFO)) {
1452 vp->m_final.lno = tp->lno;
1453 vp->m_final.cno = tp->cno;
1459 txt_err(sp, &sp->tiq);
1465 * Handle abbreviations.
1468 txt_abbrev(sp, tp, pushcp, isinfoline, didsubp, turnoffp)
1472 int isinfoline, *didsubp, *turnoffp;
1479 /* Check to make sure we're not at the start of an append. */
1481 if (tp->cno == tp->offset)
1487 * Find the start of the "word".
1490 * We match historic practice, which, as far as I can tell, had an
1491 * off-by-one error. The way this worked was that when the inserted
1492 * text switched from a "word" character to a non-word character,
1493 * vi would check for possible abbreviations. It would then take the
1494 * type (i.e. word/non-word) of the character entered TWO characters
1495 * ago, and move backward in the text until reaching a character that
1496 * was not that type, or the beginning of the insert, the line, or
1497 * the file. For example, in the string "abc<space>", when the <space>
1498 * character triggered the abbreviation check, the type of the 'b'
1499 * character was used for moving through the string. Maybe there's a
1500 * reason for not using the first (i.e. 'c') character, but I can't
1503 * Terminate at the beginning of the insert or the character after the
1504 * offset character -- both can be tested for using tp->offset.
1506 off = tp->cno - 1; /* Previous character. */
1508 len = 1; /* One character test. */
1509 if (off == tp->offset || isblank(p[-1]))
1511 if (inword(p[-1])) /* Move backward to change. */
1514 if (off == tp->offset || !inword(p[-1]))
1520 if (off == tp->offset ||
1521 inword(p[-1]) || isblank(p[-1]))
1527 * Historic vi exploded abbreviations on the command line. This has
1528 * obvious problems in that unabbreviating the string can be extremely
1529 * tricky, particularly if the string has, say, an embedded escape
1530 * character. Personally, I think it's a stunningly bad idea. Other
1531 * examples of problems this caused in historic vi are:
1534 * results in "bar" being abbreviated to "baz", which wasn't what the
1535 * user had in mind at all. Also, the commands:
1538 * resulted in an error message that "bar" wasn't mapped. Finally,
1539 * since the string was already exploded by the time the unabbreviate
1540 * command got it, all it knew was that an abbreviation had occurred.
1541 * Cleverly, it checked the replacement string for its unabbreviation
1542 * match, which meant that the commands:
1546 * unabbreviate "foo1", and the commands:
1549 * unabbreviate "foo"!
1551 * Anyway, people neglected to first ask my opinion before they wrote
1552 * macros that depend on this stuff, so, we make this work as follows.
1553 * When checking for an abbreviation on the command line, if we get a
1554 * string which is <blank> terminated and which starts at the beginning
1555 * of the line, we check to see it is the abbreviate or unabbreviate
1556 * commands. If it is, turn abbreviations off and return as if no
1557 * abbreviation was found. Note also, minor trickiness, so that if
1558 * the user erases the line and starts another command, we turn the
1559 * abbreviations back on.
1561 * This makes the layering look like a Nachos Supreme.
1563 search: if (isinfoline)
1564 if (off == tp->ai || off == tp->offset)
1565 if (ex_is_abbrev(p, len)) {
1574 /* Check for any abbreviations. */
1575 if ((qp = seq_find(sp, NULL, NULL, p, len, SEQ_ABBREV, NULL)) == NULL)
1579 * Push the abbreviation onto the tty stack. Historically, characters
1580 * resulting from an abbreviation expansion were themselves subject to
1581 * map expansions, O_SHOWMATCH matching etc. This means the expanded
1582 * characters will be re-tested for abbreviations. It's difficult to
1583 * know what historic practice in this case was, since abbreviations
1584 * were applied to :colon command lines, so entering abbreviations that
1585 * looped was tricky, although possible. In addition, obvious loops
1586 * didn't work as expected. (The command ':ab a b|ab b c|ab c a' will
1587 * silently only implement and/or display the last abbreviation.)
1589 * This implementation doesn't recover well from such abbreviations.
1590 * The main input loop counts abbreviated characters, and, when it
1591 * reaches a limit, discards any abbreviated characters on the queue.
1592 * It's difficult to back up to the original position, as the replay
1593 * queue would have to be adjusted, and the line state when an initial
1594 * abbreviated character was received would have to be saved.
1597 if (v_event_push(sp, NULL, &ch, 1, CH_ABBREVIATED))
1599 if (v_event_push(sp, NULL, qp->output, qp->olen, CH_ABBREVIATED))
1603 * If the size of the abbreviation is larger than or equal to the size
1604 * of the original text, move to the start of the replaced characters,
1605 * and add their length to the overwrite count.
1607 * If the abbreviation is smaller than the original text, we have to
1608 * delete the additional overwrite characters and copy down any insert
1612 if (qp->olen >= len)
1616 memmove(tp->lb + tp->cno + qp->olen,
1617 tp->lb + tp->cno + tp->owrite + len, tp->insert);
1618 tp->owrite += qp->olen;
1619 tp->len -= len - qp->olen;
1623 * We return the length of the abbreviated characters. This is so
1624 * the calling routine can replace the replay characters with the
1625 * abbreviation. This means that subsequent '.' commands will produce
1626 * the same text, regardless of intervening :[un]abbreviate commands.
1627 * This is historic practice.
1635 * Handle the unmap command.
1638 txt_unmap(sp, tp, ec_flagsp)
1641 u_int32_t *ec_flagsp;
1646 /* Find the beginning of this "word". */
1647 for (off = tp->cno - 1, p = tp->lb + off, len = 0;; --p, --off) {
1653 if (off == tp->ai || off == tp->offset)
1659 * Historic vi exploded input mappings on the command line. See the
1660 * txt_abbrev() routine for an explanation of the problems inherent
1663 * We make this work as follows. If we get a string which is <blank>
1664 * terminated and which starts at the beginning of the line, we check
1665 * to see it is the unmap command. If it is, we return that the input
1666 * mapping should be turned off. Note also, minor trickiness, so that
1667 * if the user erases the line and starts another command, we go ahead
1668 * an turn mapping back on.
1670 if ((off == tp->ai || off == tp->offset) && ex_is_unmap(p, len))
1671 FL_CLR(*ec_flagsp, EC_MAPINPUT);
1673 FL_SET(*ec_flagsp, EC_MAPINPUT);
1678 * When a line is resolved by <esc>, review autoindent characters.
1681 txt_ai_resolve(sp, tp, changedp)
1688 size_t cno, len, new, old, scno, spaces, tab_after_sp, tabs;
1694 * If the line is empty, has an offset, or no autoindent
1695 * characters, we're done.
1697 if (!tp->len || tp->offset || !tp->ai)
1701 * If the length is less than or equal to the autoindent
1702 * characters, delete them.
1704 if (tp->len <= tp->ai) {
1705 tp->ai = tp->cno = tp->len = 0;
1710 * The autoindent characters plus any leading <blank> characters
1711 * in the line are resolved into the minimum number of characters.
1712 * Historic practice.
1714 ts = O_VAL(sp, O_TABSTOP);
1716 /* Figure out the last <blank> screen column. */
1717 for (p = tp->lb, scno = 0, len = tp->len,
1718 spaces = tab_after_sp = 0; len-- && isblank(*p); ++p)
1722 scno += COL_OFF(scno, ts);
1729 * If there are no spaces, or no tabs after spaces and less than
1730 * ts spaces, it's already minimal.
1732 if (!spaces || !tab_after_sp && spaces < ts)
1735 /* Count up spaces/tabs needed to get to the target. */
1736 for (cno = 0, tabs = 0; cno + COL_OFF(cno, ts) <= scno; ++tabs)
1737 cno += COL_OFF(cno, ts);
1738 spaces = scno - cno;
1741 * Figure out how many characters we're dropping -- if we're not
1742 * dropping any, it's already minimal, we're done.
1745 new = spaces + tabs;
1749 /* Shift the rest of the characters down, adjust the counts. */
1751 memmove(p - del, p, tp->len - old);
1755 /* Fill in space/tab characters. */
1756 for (p = tp->lb; tabs--;)
1765 * Handle autoindent. If aitp isn't NULL, use it, otherwise,
1766 * retrieve the line.
1768 * PUBLIC: int v_txt_auto __P((SCR *, recno_t, TEXT *, size_t, TEXT *));
1771 v_txt_auto(sp, lno, aitp, len, tp)
1782 * If the ex append command is executed with an address of 0,
1783 * it's possible to get here with a line number of 0. Return
1790 if (db_get(sp, lno, DBG_FATAL, &t, &len))
1795 /* Count whitespace characters. */
1796 for (p = t; len > 0; ++p, --len)
1800 /* Set count, check for no indentation. */
1801 if ((nlen = (p - t)) == 0)
1804 /* Make sure the buffer's big enough. */
1805 BINC_RET(sp, tp->lb, tp->lb_len, tp->len + nlen);
1807 /* Copy the buffer's current contents up. */
1809 memmove(tp->lb + nlen, tp->lb, tp->len);
1812 /* Copy the indentation into the new buffer. */
1813 memmove(tp->lb, t, nlen);
1815 /* Set the autoindent count. */
1822 * Back up to the previously edited line.
1825 txt_backup(sp, tiqh, tp, flagsp)
1834 /* Get a handle on the previous TEXT structure. */
1835 if ((ntp = tp->q.cqe_prev) == (void *)tiqh) {
1836 if (!FL_ISSET(*flagsp, TXT_REPLAY))
1838 "193|Already at the beginning of the insert");
1843 ntp->len = ntp->sv_len;
1845 /* Handle appending to the line. */
1847 if (ntp->owrite == 0 && ntp->insert == 0) {
1848 ntp->lb[ntp->len] = CH_CURSOR;
1851 FL_SET(*flagsp, TXT_APPENDEOL);
1853 FL_CLR(*flagsp, TXT_APPENDEOL);
1855 /* Release the current TEXT. */
1856 CIRCLEQ_REMOVE(tiqh, tp, q);
1859 /* Update the old line on the screen. */
1860 if (vs_change(sp, ntp->lno + 1, LINE_DELETE))
1863 /* Return the new/current TEXT. */
1868 * Text indentation is truly strange. ^T and ^D do movements to the next or
1869 * previous shiftwidth value, i.e. for a 1-based numbering, with shiftwidth=3,
1870 * ^T moves a cursor on the 7th, 8th or 9th column to the 10th column, and ^D
1874 * The ^T and ^D characters in historical vi had special meaning only when they
1875 * were the first characters entered after entering text input mode. As normal
1876 * erase characters couldn't erase autoindent characters (^T in this case), it
1877 * meant that inserting text into previously existing text was strange -- ^T
1878 * only worked if it was the first keystroke(s), and then could only be erased
1879 * using ^D. This implementation treats ^T specially anywhere it occurs in the
1880 * input, and permits the standard erase characters to erase the characters it
1884 * A fun test is to try:
1886 * i<CR>^Tx<CR>^Tx<CR>^Tx<CR>^Dx<CR>^Dx<CR>^Dx<esc>
1887 * Historic vi loses some of the '$' marks on the line ends, but otherwise gets
1891 * Technically, txt_dent should be part of the screen interface, as it requires
1892 * knowledge of character sizes, including <space>s, on the screen. It's here
1893 * because it's a complicated little beast, and I didn't want to shove it down
1894 * into the screen. It's probable that KEY_LEN will call into the screen once
1895 * there are screens with different character representations.
1898 * Handle ^T indents, ^D outdents.
1900 * If anything changes here, check the ex version to see if it needs similar
1904 txt_dent(sp, tp, isindent)
1911 size_t cno, current, spaces, target, tabs, off;
1914 ts = O_VAL(sp, O_TABSTOP);
1915 sw = O_VAL(sp, O_SHIFTWIDTH);
1918 * Since we don't know what precedes the character(s) being inserted
1919 * (or deleted), the preceding whitespace characters must be resolved.
1920 * An example is a <tab>, which doesn't need a full shiftwidth number
1921 * of columns because it's preceded by <space>s. This is easy to get
1922 * if the user sets shiftwidth to a value less than tabstop (or worse,
1923 * something for which tabstop isn't a multiple) and then uses ^T to
1924 * indent, and ^D to outdent.
1926 * Figure out the current and target screen columns. In the historic
1927 * vi, the autoindent column was NOT determined using display widths
1928 * of characters as was the wrapmargin column. For that reason, we
1929 * can't use the vs_column() function, but have to calculate it here.
1930 * This is slow, but it's normally only on the first few characters of
1933 for (current = cno = 0; cno < tp->cno; ++cno)
1934 current += tp->lb[cno] == '\t' ?
1935 COL_OFF(current, ts) : KEY_LEN(sp, tp->lb[cno]);
1939 target += COL_OFF(target, sw);
1941 target -= --target % sw;
1944 * The AI characters will be turned into overwrite characters if the
1945 * cursor immediately follows them. We test both the cursor position
1946 * and the indent flag because there's no single test. (^T can only
1947 * be detected by the cursor position, and while we know that the test
1948 * is always true for ^D, the cursor can be in more than one place, as
1949 * "0^D" and "^D" are different.)
1951 ai_reset = !isindent || tp->cno == tp->ai + tp->offset;
1954 * Back up over any previous <blank> characters, changing them into
1955 * overwrite characters (including any ai characters). Then figure
1956 * out the current screen column.
1958 for (; tp->cno > tp->offset &&
1959 (tp->lb[tp->cno - 1] == ' ' || tp->lb[tp->cno - 1] == '\t');
1960 --tp->cno, ++tp->owrite);
1961 for (current = cno = 0; cno < tp->cno; ++cno)
1962 current += tp->lb[cno] == '\t' ?
1963 COL_OFF(current, ts) : KEY_LEN(sp, tp->lb[cno]);
1966 * If we didn't move up to or past the target, it's because there
1967 * weren't enough characters to delete, e.g. the first character
1968 * of the line was a tp->offset character, and the user entered
1969 * ^D to move to the beginning of a line. An example of this is:
1971 * :set ai sw=4<cr>i<space>a<esc>i^T^D
1973 * Otherwise, count up the total spaces/tabs needed to get from the
1974 * beginning of the line (or the last non-<blank> character) to the
1977 if (current >= target)
1981 tabs = 0; cno + COL_OFF(cno, ts) <= target; ++tabs)
1982 cno += COL_OFF(cno, ts);
1983 spaces = target - cno;
1986 /* If we overwrote ai characters, reset the ai count. */
1988 tp->ai = tabs + spaces;
1991 * Call txt_insch() to insert each character, so that we get the
1992 * correct effect when we add a <tab> to replace N <spaces>.
1994 for (ch = '\t'; tabs > 0; --tabs)
1995 (void)txt_insch(sp, tp, &ch, 0);
1996 for (ch = ' '; spaces > 0; --spaces)
1997 (void)txt_insch(sp, tp, &ch, 0);
2003 * File name completion.
2006 txt_fc(sp, tp, redrawp)
2015 size_t indx, len, nlen, off;
2023 * Find the beginning of this "word" -- if we're at the beginning
2024 * of the line, it's a special case.
2030 retry: for (len = 0,
2031 off = tp->cno - 1, p = tp->lb + off;; --off, --p) {
2037 if (off == tp->ai || off == tp->offset)
2042 * Get enough space for a wildcard character.
2045 * This won't work for "foo\", since the \ will escape the expansion
2046 * character. I'm not sure if that's a bug or not...
2049 BINC_RET(sp, tp->lb, tp->lb_len, tp->len + 1);
2055 /* Build an ex command, and call the ex expansion routines. */
2056 ex_cinit(&cmd, 0, 0, OOBLNO, OOBLNO, 0, NULL);
2057 if (argv_init(sp, &cmd))
2059 if (argv_exp2(sp, &cmd, p, len + 1)) {
2069 case 0: /* No matches. */
2071 (void)sp->gp->scr_bell(sp);
2073 case 1: /* One match. */
2074 /* If something changed, do the exchange. */
2075 nlen = strlen(cmd.argv[0]->bp);
2076 if (len != nlen || memcmp(cmd.argv[0]->bp, p, len))
2079 /* If haven't done a directory test, do it now. */
2081 !stat(cmd.argv[0]->bp, &sb) && S_ISDIR(sb.st_mode)) {
2086 /* If nothing changed, period, ring the bell. */
2088 (void)sp->gp->scr_bell(sp);
2090 default: /* Multiple matches. */
2092 if (txt_fc_col(sp, argc, argv))
2095 /* Find the length of the shortest match. */
2096 for (nlen = cmd.argv[0]->len; --argc > 0;) {
2097 if (cmd.argv[argc]->len < nlen)
2098 nlen = cmd.argv[argc]->len;
2099 for (indx = 0; indx < nlen &&
2100 cmd.argv[argc]->bp[indx] == cmd.argv[0]->bp[indx];
2107 /* Overwrite the expanded text first. */
2108 for (t = cmd.argv[0]->bp; len > 0 && nlen > 0; --len, --nlen)
2111 /* If lost text, make the remaining old text overwrite characters. */
2117 /* Overwrite any overwrite characters next. */
2118 for (; nlen > 0 && tp->owrite > 0; --nlen, --tp->owrite, ++tp->cno)
2121 /* Shift remaining text up, and move the cursor to the end. */
2124 BINC_RET(sp, tp->lb, tp->lb_len, tp->len + nlen);
2130 if (tp->insert != 0)
2131 (void)memmove(p + nlen, p, tp->insert);
2136 /* If a single match and it's a directory, retry it. */
2137 if (argc == 1 && !stat(cmd.argv[0]->bp, &sb) && S_ISDIR(sb.st_mode)) {
2138 isdir: if (tp->owrite == 0) {
2140 BINC_RET(sp, tp->lb, tp->lb_len, tp->len + 1);
2142 if (tp->insert != 0)
2143 (void)memmove(p + 1, p, tp->insert);
2159 * Display file names for file name completion.
2162 txt_fc_col(sp, argc, argv)
2170 size_t base, cnt, col, colwidth, numrows, numcols, prefix, row;
2175 /* Trim any directory prefix common to all of the files. */
2176 if ((p = strrchr(argv[0]->bp, '/')) == NULL)
2179 prefix = (p - argv[0]->bp) + 1;
2180 for (ac = argc - 1, av = argv + 1; ac > 0; --ac, ++av)
2181 if (av[0]->len < prefix ||
2182 memcmp(av[0]->bp, argv[0]->bp, prefix)) {
2189 * Figure out the column width for the longest name. Output is done on
2190 * 6 character "tab" boundaries for no particular reason. (Since we
2191 * don't output tab characters, we ignore the terminal's tab settings.)
2192 * Ignore the user's tab setting because we have no idea how reasonable
2195 for (ac = argc, av = argv, colwidth = 0; ac > 0; --ac, ++av) {
2196 for (col = 0, p = av[0]->bp + prefix; *p != '\0'; ++p)
2197 col += KEY_LEN(sp, *p);
2201 colwidth += COL_OFF(colwidth, 6);
2204 * Writing to the bottom line of the screen is always turned off when
2205 * SC_TINPUT_INFO is set. Turn it back on, we know what we're doing.
2207 if (F_ISSET(sp, SC_TINPUT_INFO)) {
2209 F_CLR(sp, SC_TINPUT_INFO);
2214 if (F_ISSET(gp, G_INTERRUPTED)) \
2217 /* If the largest file name is too large, just print them. */
2218 if (colwidth > sp->cols) {
2219 p = msg_print(sp, av[0]->bp + prefix, &nf);
2220 for (ac = argc, av = argv; ac > 0; --ac, ++av) {
2221 (void)ex_printf(sp, "%s\n", p);
2222 if (F_ISSET(gp, G_INTERRUPTED))
2226 FREE_SPACE(sp, p, 0);
2229 /* Figure out the number of columns. */
2230 numcols = (sp->cols - 1) / colwidth;
2231 if (argc > numcols) {
2232 numrows = argc / numcols;
2238 /* Display the files in sorted order. */
2239 for (row = 0; row < numrows; ++row) {
2240 for (base = row, col = 0; col < numcols; ++col) {
2241 p = msg_print(sp, argv[base]->bp + prefix, &nf);
2242 cnt = ex_printf(sp, "%s", p);
2244 FREE_SPACE(sp, p, 0);
2246 if ((base += numrows) >= argc)
2249 "%*s", (int)(colwidth - cnt), "");
2252 (void)ex_puts(sp, "\n");
2255 (void)ex_puts(sp, "\n");
2258 (void)ex_fflush(sp);
2261 intr: F_CLR(gp, G_INTERRUPTED);
2264 F_SET(sp, SC_TINPUT_INFO);
2271 * Set the end mark on the line.
2274 txt_emark(sp, tp, cno)
2280 size_t chlen, nlen, olen;
2286 * The end mark may not be the same size as the current character.
2287 * Don't let the line shift.
2289 nlen = KEY_LEN(sp, ch);
2290 if (tp->lb[cno] == '\t')
2291 (void)vs_columns(sp, tp->lb, tp->lno, &cno, &olen);
2293 olen = KEY_LEN(sp, tp->lb[cno]);
2296 * If the line got longer, well, it's weird, but it's easy. If
2297 * it's the same length, it's easy. If it got shorter, we have
2301 BINC_RET(sp, tp->lb, tp->lb_len, tp->len + olen);
2302 chlen = olen - nlen;
2303 if (tp->insert != 0)
2304 memmove(tp->lb + cno + 1 + chlen,
2305 tp->lb + cno + 1, tp->insert);
2308 tp->owrite += chlen;
2310 if (tp->lb[cno] == '\t')
2311 for (cno += chlen; chlen--;)
2314 for (kp = KEY_NAME(sp, tp->lb[cno]),
2315 cno += chlen; chlen--;)
2319 return (vs_change(sp, tp->lno, LINE_RESET));
2324 * Handle an error during input processing.
2334 * The problem with input processing is that the cursor is at an
2335 * indeterminate position since some input may have been lost due
2336 * to a malloc error. So, try to go back to the place from which
2337 * the cursor started, knowing that it may no longer be available.
2339 * We depend on at least one line number being set in the text
2342 for (lno = tiqh->cqh_first->lno;
2343 !db_exist(sp, lno) && lno > 0; --lno);
2345 sp->lno = lno == 0 ? 1 : lno;
2348 /* Redraw the screen, just in case. */
2349 F_SET(sp, SC_SCR_REDRAW);
2354 * Let the user insert any character value they want.
2357 * This is an extension. The pattern "^X[0-9a-fA-F]*" is a way
2358 * for the user to specify a character value which their keyboard
2359 * may not be able to enter.
2372 * Null-terminate the string. Since nul isn't a legal hex value,
2373 * this should be okay, and lets us use a local routine, which
2374 * presumably understands the character set, to convert the value.
2376 savec = tp->lb[tp->cno];
2377 tp->lb[tp->cno] = 0;
2379 /* Find the previous CH_HEX character. */
2380 for (off = tp->cno - 1, p = tp->lb + off, len = 0;; --p, --off, ++len) {
2385 /* Not on this line? Shouldn't happen. */
2386 if (off == tp->ai || off == tp->offset)
2390 /* If length of 0, then it wasn't a hex value. */
2394 /* Get the value. */
2396 value = strtol(wp, NULL, 16);
2397 if (errno || value > MAX_CHAR_T) {
2398 nothex: tp->lb[tp->cno] = savec;
2402 /* Restore the original character. */
2403 tp->lb[tp->cno] = savec;
2405 /* Adjust the bookkeeping. */
2408 tp->lb[tp->cno - 1] = value;
2410 /* Copy down any overwrite characters. */
2412 memmove(tp->lb + tp->cno, tp->lb + tp->cno + len, tp->owrite);
2414 /* Copy down any insert characters. */
2416 memmove(tp->lb + tp->cno + tp->owrite,
2417 tp->lb + tp->cno + tp->owrite + len, tp->insert);
2426 * Historic vi did a special screen optimization for tab characters. As an
2427 * example, for the keystrokes "iabcd<esc>0C<tab>", the tab overwrote the
2428 * rest of the string when it was displayed.
2430 * Because early versions of this implementation redisplayed the entire line
2431 * on each keystroke, the "bcd" was pushed to the right as it ignored that
2432 * the user had "promised" to change the rest of the characters. However,
2433 * the historic vi implementation had an even worse bug: given the keystrokes
2434 * "iabcd<esc>0R<tab><esc>", the "bcd" disappears, and magically reappears
2435 * on the second <esc> key.
2437 * POSIX 1003.2 requires (will require) that this be fixed, specifying that
2438 * vi overwrite characters the user has committed to changing, on the basis
2439 * of the screen space they require, but that it not overwrite other characters.
2442 txt_insch(sp, tp, chp, flags)
2449 size_t chlen, cno, copydown, olen, nlen;
2453 * The 'R' command does one-for-one replacement, because there's
2454 * no way to know how many characters the user intends to replace.
2456 if (LF_ISSET(TXT_REPLACE)) {
2459 tp->lb[tp->cno++] = *chp;
2462 } else if (tp->owrite) { /* Overwrite a character. */
2466 * If the old or new characters are tabs, then the length of the
2467 * display depends on the character position in the display. We
2468 * don't even try to handle this here, just ask the screen.
2471 savech = tp->lb[cno];
2473 (void)vs_columns(sp, tp->lb, tp->lno, &cno, &nlen);
2474 tp->lb[cno] = savech;
2476 nlen = KEY_LEN(sp, *chp);
2479 * Eat overwrite characters until we run out of them or we've
2480 * handled the length of the new character. If we only eat
2481 * part of an overwrite character, break it into its component
2482 * elements and display the remaining components.
2484 for (copydown = 0; nlen != 0 && tp->owrite != 0;) {
2487 if (tp->lb[cno] == '\t')
2488 (void)vs_columns(sp,
2489 tp->lb, tp->lno, &cno, &olen);
2491 olen = KEY_LEN(sp, tp->lb[cno]);
2502 tp->lb, tp->lb_len, tp->len + olen);
2503 chlen = olen - nlen;
2504 memmove(tp->lb + cno + 1 + chlen,
2505 tp->lb + cno + 1, tp->owrite + tp->insert);
2508 tp->owrite += chlen;
2509 if (tp->lb[cno] == '\t')
2510 for (p = tp->lb + cno + 1; chlen--;)
2514 KEY_NAME(sp, tp->lb[cno]) + nlen,
2515 p = tp->lb + cno + 1; chlen--;)
2523 * If had to erase several characters, we adjust the total
2524 * count, and if there are any characters left, shift them
2527 if (copydown != 0 && (tp->len -= copydown) != 0)
2528 memmove(tp->lb + cno, tp->lb + cno + copydown,
2529 tp->owrite + tp->insert + copydown);
2531 /* If we had enough overwrite characters, we're done. */
2533 tp->lb[tp->cno++] = *chp;
2538 /* Check to see if the character fits into the input buffer. */
2539 BINC_RET(sp, tp->lb, tp->lb_len, tp->len + 1);
2542 if (tp->insert) { /* Insert a character. */
2543 if (tp->insert == 1)
2544 tp->lb[tp->cno + 1] = tp->lb[tp->cno];
2546 memmove(tp->lb + tp->cno + 1,
2547 tp->lb + tp->cno, tp->owrite + tp->insert);
2549 tp->lb[tp->cno++] = *chp;
2555 * Do an incremental search.
2558 txt_isrch(sp, vp, tp, is_flagsp)
2562 u_int8_t *is_flagsp;
2568 /* If it's a one-line screen, we don't do incrementals. */
2569 if (IS_ONELINE(sp)) {
2570 FL_CLR(*is_flagsp, IS_RUNNING);
2575 * If the user erases back to the beginning of the buffer, there's
2576 * nothing to search for. Reset the cursor to the starting point.
2579 vp->m_final = vp->m_start;
2584 * If it's an RE quote character, and not quoted, ignore it until
2585 * we get another character.
2587 if (tp->lb[tp->cno - 1] == '\\' &&
2588 (tp->cno == 2 || tp->lb[tp->cno - 2] != '\\'))
2592 * If it's a magic shell character, and not quoted, reset the cursor
2593 * to the starting point.
2595 if (strchr(O_STR(sp, O_SHELLMETA), tp->lb[tp->cno - 1]) != NULL &&
2596 (tp->cno == 2 || tp->lb[tp->cno - 2] != '\\'))
2597 vp->m_final = vp->m_start;
2600 * If we see the search pattern termination character, then quit doing
2601 * an incremental search. There may be more, e.g., ":/foo/;/bar/",
2602 * and we can't handle that incrementally. Also, reset the cursor to
2603 * the original location, the ex search routines don't know anything
2604 * about incremental searches.
2606 if (tp->lb[0] == tp->lb[tp->cno - 1] &&
2607 (tp->cno == 2 || tp->lb[tp->cno - 2] != '\\')) {
2608 vp->m_final = vp->m_start;
2609 FL_CLR(*is_flagsp, IS_RUNNING);
2614 * Remember the input line and discard the special input map,
2615 * but don't overwrite the input line on the screen.
2618 F_SET(VIP(sp), VIP_S_MODELINE);
2619 F_CLR(sp, SC_TINPUT | SC_TINPUT_INFO);
2620 if (txt_map_end(sp))
2624 * Specify a starting point and search. If we find a match, move to
2625 * it and refresh the screen. If we didn't find the match, then we
2626 * beep the screen. When searching from the original cursor position,
2627 * we have to move the cursor, otherwise, we don't want to move the
2628 * cursor in case the text at the current position continues to match.
2630 if (FL_ISSET(*is_flagsp, IS_RESTART)) {
2631 start = vp->m_start;
2634 start = vp->m_final;
2635 sf = SEARCH_INCR | SEARCH_SET;
2638 if (tp->lb[0] == '/' ?
2640 &start, &vp->m_final, tp->lb + 1, tp->cno - 1, NULL, sf) :
2642 &start, &vp->m_final, tp->lb + 1, tp->cno - 1, NULL, sf)) {
2643 sp->lno = vp->m_final.lno;
2644 sp->cno = vp->m_final.cno;
2645 FL_CLR(*is_flagsp, IS_RESTART);
2647 if (!KEYS_WAITING(sp) && vs_refresh(sp, 0))
2650 FL_SET(*is_flagsp, IS_RESTART);
2652 /* Reinstantiate the special input map. */
2653 if (txt_map_init(sp))
2655 F_CLR(VIP(sp), VIP_S_MODELINE);
2656 F_SET(sp, SC_TINPUT | SC_TINPUT_INFO);
2658 /* Reset the line number of the input line. */
2659 tp->lno = TMAP[0].lno;
2662 * If the colon command-line moved, i.e. the screen scrolled,
2663 * refresh the input line.
2666 * We shouldn't be calling vs_line, here -- we need dirty bits
2667 * on entries in the SMAP array.
2669 if (lno != TMAP[0].lno) {
2670 if (vs_line(sp, &TMAP[0], NULL, NULL))
2672 (void)sp->gp->scr_refresh(sp, 0);
2679 * Resolve the input text chain into the file.
2682 txt_resolve(sp, tiqh, flags)
2693 * The first line replaces a current line, and all subsequent lines
2694 * are appended into the file. Resolve autoindented characters for
2695 * each line before committing it. If the latter causes the line to
2696 * change, we have to redisplay it, otherwise the information cached
2697 * about the line will be wrong.
2700 tp = tiqh->cqh_first;
2702 if (LF_ISSET(TXT_AUTOINDENT))
2703 txt_ai_resolve(sp, tp, &changed);
2706 if (db_set(sp, tp->lno, tp->lb, tp->len) ||
2707 changed && vs_change(sp, tp->lno, LINE_RESET))
2710 for (lno = tp->lno; (tp = tp->q.cqe_next) != (void *)&sp->tiq; ++lno) {
2711 if (LF_ISSET(TXT_AUTOINDENT))
2712 txt_ai_resolve(sp, tp, &changed);
2715 if (db_append(sp, 0, lno, tp->lb, tp->len) ||
2716 changed && vs_change(sp, tp->lno, LINE_RESET))
2721 * Clear the input flag, the look-aside buffer is no longer valid.
2722 * Has to be done as part of text resolution, or upon return we'll
2723 * be looking at incorrect data.
2725 F_CLR(sp, SC_TINPUT);
2732 * Show a character match.
2735 * Historic vi tried to display matches even in the :colon command line.
2739 txt_showmatch(sp, tp)
2746 int cnt, endc, startc;
2751 * Do a refresh first, in case we haven't done one in awhile,
2752 * so the user can see what we're complaining about.
2754 UPDATE_POSITION(sp, tp);
2755 if (vs_refresh(sp, 1))
2759 * We don't display the match if it's not on the screen. Find
2760 * out what the first character on the screen is.
2762 if (vs_sm_position(sp, &m, 0, P_TOP))
2765 /* Initialize the getc() interface. */
2766 cs.cs_lno = tp->lno;
2767 cs.cs_cno = tp->cno - 1;
2768 if (cs_init(sp, &cs))
2770 startc = (endc = cs.cs_ch) == ')' ? '(' : '{';
2772 /* Search for the match. */
2774 if (cs_prev(sp, &cs))
2776 if (cs.cs_flags != 0) {
2777 if (cs.cs_flags == CS_EOF || cs.cs_flags == CS_SOF) {
2779 "Unmatched %s", KEY_NAME(sp, endc));
2784 if (cs.cs_ch == endc)
2786 else if (cs.cs_ch == startc && --cnt == 0)
2790 /* If the match is on the screen, move to it. */
2791 if (cs.cs_lno < m.lno || cs.cs_lno == m.lno && cs.cs_cno < m.cno)
2793 sp->lno = cs.cs_lno;
2794 sp->cno = cs.cs_cno;
2795 if (vs_refresh(sp, 1))
2798 /* Wait for timeout or character arrival. */
2799 return (v_event_get(sp,
2800 NULL, O_VAL(sp, O_MATCHTIME) * 100, EC_TIMEOUT));
2805 * Handle margin wrap.
2808 txt_margin(sp, tp, wmtp, didbreak, flags)
2818 /* Find the nearest previous blank. */
2819 for (off = tp->cno - 1, p = tp->lb + off, len = 0;; --off, --p, ++len) {
2826 * If reach the start of the line, there's nowhere to break.
2829 * Historic vi belled each time a character was entered after
2830 * crossing the margin until a space was entered which could
2831 * be used to break the line. I don't as it tends to wake the
2834 if (off == tp->ai || off == tp->offset) {
2841 * Store saved information about the rest of the line in the
2842 * wrapmargin TEXT structure.
2845 * The offset field holds the length of the current characters
2846 * that the user entered, but which are getting split to the new
2847 * line -- it's going to be used to set the cursor value when we
2848 * move to the new line.
2853 wmtp->insert = LF_ISSET(TXT_APPENDEOL) ? tp->insert - 1 : tp->insert;
2854 wmtp->owrite = tp->owrite;
2856 /* Correct current bookkeeping information. */
2858 if (LF_ISSET(TXT_APPENDEOL)) {
2859 tp->len -= len + tp->owrite + (tp->insert - 1);
2862 tp->len -= len + tp->owrite + tp->insert;
2869 * Delete any trailing whitespace from the current line.
2871 for (;; --p, --off) {
2876 if (off == tp->ai || off == tp->offset)
2885 * Resolve the input line for the 'R' command.
2888 txt_Rresolve(sp, tiqh, tp, orig_len)
2892 const size_t orig_len;
2895 size_t input_len, retain;
2899 * Check to make sure that the cursor hasn't moved beyond
2900 * the end of the line.
2902 if (tp->owrite == 0)
2906 * Calculate how many characters the user has entered,
2907 * plus the blanks erased by <carriage-return>/<newline>s.
2909 for (ttp = tiqh->cqh_first, input_len = 0;;) {
2910 input_len += ttp == tp ? tp->cno : ttp->len + ttp->R_erase;
2911 if ((ttp = ttp->q.cqe_next) == (void *)&sp->tiq)
2916 * If the user has entered less characters than the original line
2917 * was long, restore any overwriteable characters to the original
2918 * characters. These characters are entered as "insert characters",
2919 * because they're after the cursor and we don't want to lose them.
2920 * (This is okay because the R command has no insert characters.)
2921 * We set owrite to 0 so that the insert characters don't get copied
2922 * to somewhere else, which means that the line and the length have
2923 * to be adjusted here as well.
2925 * We have to retrieve the original line because the original pinned
2926 * page has long since been discarded. If it doesn't exist, that's
2927 * okay, the user just extended the file.
2929 if (input_len < orig_len) {
2930 retain = MIN(tp->owrite, orig_len - input_len);
2932 tiqh->cqh_first->lno, DBG_FATAL | DBG_NOCACHE, &p, NULL))
2934 memcpy(tp->lb + tp->cno, p + input_len, retain);
2935 tp->len -= tp->owrite - retain;
2937 tp->insert += retain;
2943 * No more characters message.
2949 msgq(sp, M_BERR, "194|No more characters to erase");