3 * The Regents of the University of California. All rights reserved.
5 * %sccs.include.redist.c%
9 static char sccsid
[] = "$Id: v_txt.c,v 8.69 1993/12/22 13:03:42 bostic Exp $ (Berkeley) $Date: 1993/12/22 13:03:42 $";
12 #include <sys/types.h>
25 static int txt_abbrev
__P((SCR
*, TEXT
*, int *, ARG_CHAR_T
));
26 static void txt_ai_resolve
__P((SCR
*, TEXT
*));
27 static TEXT
*txt_backup
__P((SCR
*, EXF
*, TEXTH
*, TEXT
*, u_int
));
28 static void txt_err
__P((SCR
*, EXF
*, TEXTH
*));
29 static int txt_hex
__P((SCR
*, TEXT
*, int *, ARG_CHAR_T
));
30 static int txt_indent
__P((SCR
*, TEXT
*));
31 static int txt_margin
__P((SCR
*, TEXT
*, int *, ARG_CHAR_T
));
32 static int txt_outdent
__P((SCR
*, TEXT
*));
33 static void txt_showmatch
__P((SCR
*, EXF
*));
34 static int txt_resolve
__P((SCR
*, EXF
*, TEXTH
*));
36 /* Cursor character (space is hard to track on the screen). */
37 #if defined(DEBUG) && 0
42 /* Local version of BINC. */
43 #define TBINC(sp, lp, llen, nlen) { \
44 if ((nlen) > llen && binc(sp, &(lp), &(llen), nlen)) \
50 * Read in text from the user.
53 * Historic vi always used:
55 * ^D: autoindent deletion
56 * ^H: last character deletion
57 * ^W: last word deletion
58 * ^V: quote the next character
60 * regardless of the user's choices for these characters. The user's erase
61 * and kill characters worked in addition to these characters. Ex was not
62 * completely consistent with this, as it did map the scroll command to the
63 * user's EOF character.
65 * This implementation does not use fixed characters, but uses whatever the
66 * user specified as described by the termios structure. I'm getting away
67 * with something here, but I think I'm unlikely to get caught.
70 * Historic vi did a special screen optimization for tab characters. For
71 * the keystrokes "iabcd<esc>0C<tab>", the tab would overwrite the rest of
72 * the string when it was displayed. Because this implementation redisplays
73 * the entire line on each keystroke, the "bcd" gets pushed to the right as
74 * we ignore that the user has "promised" to change the rest of the characters.
75 * Users have noticed, but this isn't worth fixing, and, the way that the
76 * historic vi did it results in an even worse bug. Given the keystrokes
77 * "iabcd<esc>0R<tab><esc>", the "bcd" disappears, and magically reappears
78 * on the second <esc> key.
81 v_ntext(sp
, ep
, tiqh
, tm
, lp
, len
, rp
, prompt
, ai_line
, flags
)
85 MARK
*tm
; /* To MARK. */
86 const char *lp
; /* Input line. */
87 const size_t len
; /* Input line length. */
88 MARK
*rp
; /* Return MARK. */
89 int prompt
; /* Prompt to display. */
90 recno_t ai_line
; /* Line number to use for autoindent count. */
91 u_int flags
; /* TXT_ flags. */
93 /* State of abbreviation checks. */
94 enum { A_NOTSET
, A_SPACE
, A_NOTSPACE
} abb
;
95 /* State of the "[^0]^D" sequences. */
96 enum { C_NOTSET
, C_CARATSET
, C_NOCHANGE
, C_ZEROSET
} carat_st
;
97 /* State of the hex input character. */
98 enum { H_NOTSET
, H_NEXTCHAR
, H_INHEX
} hex
;
99 /* State of quotation. */
100 enum { Q_NOTSET
, Q_NEXTCHAR
, Q_THISCHAR
} quoted
;
101 CH ikey
; /* Input character structure. */
102 CHAR_T ch
; /* Input character. */
103 GS
*gp
; /* Global pointer. */
104 TEXT
*tp
, *ntp
, ait
; /* Input and autoindent text structures. */
105 size_t rcol
; /* 0-N: insert offset in the replay buffer. */
106 size_t col
; /* Current column. */
107 u_long margin
; /* Wrapmargin value. */
108 u_int iflags
; /* Input flags. */
109 int ab_cnt
; /* Abbreviation count. */
110 int eval
; /* Routine return value. */
111 int replay
; /* If replaying a set of input. */
112 int showmatch
; /* Showmatch set on this character. */
113 int testnr
; /* Test first character for nul replay. */
118 * Set the input flag, so tabs get displayed correctly
119 * and everyone knows that the text buffer is in use.
123 /* Set return value. */
127 * Get one TEXT structure with some initial buffer space, reusing
128 * the last one if it's big enough. (All TEXT bookkeeping fields
129 * default to 0 -- text_init() handles this.) If changing a line,
130 * copy it into the TEXT buffer.
132 if (tiqh
->cqh_first
!= (void *)tiqh
) {
133 tp
= tiqh
->cqh_first
;
134 if (tp
->q
.cqe_next
!= (void *)tiqh
|| tp
->lb_len
< len
+ 32) {
138 tp
->ai
= tp
->insert
= tp
->offset
= tp
->owrite
= 0;
141 memmove(tp
->lb
, lp
, len
);
145 newtp
: if ((tp
= text_init(sp
, lp
, len
, len
+ 32)) == NULL
)
147 CIRCLEQ_INSERT_HEAD(tiqh
, tp
, q
);
150 /* Set the starting line number. */
154 * Set the insert and overwrite counts. If overwriting characters,
155 * do insertion afterward. If not overwriting characters, assume
156 * doing insertion. If change is to a mark, emphasize it with an
160 if (LF_ISSET(TXT_OVERWRITE
)) {
161 tp
->owrite
= tm
->cno
- sp
->cno
;
162 tp
->insert
= len
- tm
->cno
;
164 tp
->insert
= len
- sp
->cno
;
166 if (LF_ISSET(TXT_EMARK
))
167 tp
->lb
[tm
->cno
- 1] = END_CH
;
171 * Many of the special cases in this routine are to handle autoindent
172 * support. Somebody decided that it would be a good idea if "^^D"
173 * and "0^D" deleted all of the autoindented characters. In an editor
174 * that takes single character input from the user, this wasn't a very
175 * good idea. Note also that "^^D" resets the next lines' autoindent,
178 * We assume that autoindent only happens on empty lines, so insert
179 * and overwrite will be zero. If doing autoindent, figure out how
180 * much indentation we need and fill it in. Update input column and
181 * screen cursor as necessary.
183 if (LF_ISSET(TXT_AUTOINDENT
) && ai_line
!= OOBLNO
) {
184 if (txt_auto(sp
, ep
, ai_line
, NULL
, 0, tp
))
189 * The cc and S commands have a special feature -- leading
190 * <blank> characters are handled as autoindent characters.
193 if (LF_ISSET(TXT_AICHARS
)) {
197 tp
->offset
= sp
->cno
;
200 /* If getting a command buffer from the user, there may be a prompt. */
201 if (LF_ISSET(TXT_PROMPT
)) {
202 tp
->lb
[sp
->cno
++] = prompt
;
208 * If appending after the end-of-line, add a space into the buffer
209 * and move the cursor right. This space is inserted, i.e. pushed
210 * along, and then deleted when the line is resolved. Assumes that
211 * the cursor is already positioned at the end of the line. This
212 * avoids the nastiness of having the cursor reside on a magical
213 * column, i.e. a column that doesn't really exist. The only down
214 * side is that we may wrap lines or scroll the screen before it's
215 * strictly necessary. Not a big deal.
217 if (LF_ISSET(TXT_APPENDEOL
)) {
218 tp
->lb
[sp
->cno
] = CURSOR_CH
;
224 * Historic practice is that the wrapmargin value was a distance
225 * from the RIGHT-HAND column, not the left. It's more useful to
226 * us as a distance from the left-hand column.
229 * Replay commands are not affected by wrapmargin values. What
230 * I found surprising was that people actually depend on it, as
231 * in this gem of a macro which centers lines:
233 * map #c $mq81a ^V^[81^V|D`qld0:s/ / /g^V^M$p
236 * Setting margin causes a significant performance hit. Normally
237 * we don't update the screen if there are keys waiting, but we
238 * have to if margin is set, otherwise the screen routines don't
239 * know where the cursor is.
241 if (LF_ISSET(TXT_REPLAY
) || !LF_ISSET(TXT_WRAPMARGIN
))
243 else if ((margin
= O_VAL(sp
, O_WRAPMARGIN
)) != 0)
244 margin
= sp
->cols
- margin
;
246 /* Initialize abbreviations checks. */
247 if (F_ISSET(sp
, S_ABBREV
) && LF_ISSET(TXT_MAPINPUT
)) {
254 * Set up the dot command. Dot commands are done by saving the
255 * actual characters and replaying the input. We have to push
256 * the characters onto the key stack and then handle them normally,
257 * otherwise things like wrapmargin will fail.
260 * It would be nice if we could swallow backspaces and such, but
261 * it's not all that easy to do. Another possibility would be to
262 * recognize full line insertions, which could be performed quickly,
267 if (replay
= LF_ISSET(TXT_REPLAY
)) {
270 * Historically, it wasn't an error to replay non-existent
271 * input. This test is necessary, we get here by the user
272 * doing an input command followed by a nul.
275 * Historically, vi did not remap or reabbreviate replayed
276 * input. It did, however, beep at you if you changed an
277 * abbreviation and then replayed the input. We're not that
280 if (VIP(sp
)->rep
== NULL
)
282 if (term_push(sp
, VIP(sp
)->rep
, VIP(sp
)->rep_cnt
, 0, CH_NOMAP
))
290 iflags
= LF_ISSET(TXT_MAPCOMMAND
| TXT_MAPINPUT
);
291 for (gp
= sp
->gp
, showmatch
= 0,
292 carat_st
= C_NOTSET
, hex
= H_NOTSET
, quoted
= Q_NOTSET
;;) {
294 * Reset the line and update the screen. (The txt_showmatch()
295 * code refreshes the screen for us.) Don't refresh unless
296 * we're about to wait on a character or we need to know where
297 * the cursor really is.
299 if (showmatch
|| margin
|| !KEYS_WAITING(sp
)) {
300 if (sp
->s_change(sp
, ep
, tp
->lno
, LINE_RESET
))
304 txt_showmatch(sp
, ep
);
305 } else if (sp
->s_refresh(sp
, ep
))
309 /* Get the next character. */
310 next_ch
: if (term_key(sp
, &ikey
, iflags
) != INP_OK
)
314 /* Abbreviation check. See comment in txt_abbrev(). */
315 #define MAX_ABBREVIATION_EXPANSION 256
316 if (ikey
.flags
& CH_ABBREVIATED
) {
317 if (++ab_cnt
> MAX_ABBREVIATION_EXPANSION
) {
319 "Abbreviation exceeded maximum number of characters");
328 * Historic feature. If the first character of the input is
329 * a nul, replay the previous input. This isn't documented
330 * anywhere, and is a great test of vi clones.
332 if (ch
== '\0' && testnr
) {
339 * Check to see if the character fits into the input (and
340 * replay, if necessary) buffers. It isn't necessary to
341 * have tp->len bytes, since it doesn't consider overwrite
342 * characters, but not worth fixing.
344 if (LF_ISSET(TXT_RECORD
)) {
345 TBINC(sp
, VIP(sp
)->rep
, VIP(sp
)->rep_len
, rcol
+ 1);
346 VIP(sp
)->rep
[rcol
++] = ch
;
348 TBINC(sp
, tp
->lb
, tp
->lb_len
, tp
->len
+ 1);
351 * If the character was quoted, replace the last character
352 * (the literal mark) with the new character. If quoted
353 * by someone else, simply insert the character.
356 * Extension -- if the quoted character is HEX_CH, enter hex
357 * mode. If the user enters "<HEX_CH>[isxdigit()]*" we will
358 * try to use the value as a character. Anything else resets
361 if (ikey
.flags
& CH_QUOTED
)
363 if (quoted
== Q_THISCHAR
) {
373 switch (ikey
.value
) {
375 case K_NL
: /* New line. */
376 #define LINE_RESOLVE { \
378 * Handle abbreviations. If there was one, \
379 * discard the replay characters. \
381 if (abb == A_NOTSPACE && !replay) { \
382 if (txt_abbrev(sp, tp, &tmp, ch)) \
385 if (LF_ISSET(TXT_RECORD)) \
390 if (abb != A_NOTSET) \
392 /* Handle hex numbers. */ \
393 if (hex == H_INHEX) { \
394 if (txt_hex(sp, tp, &tmp, ch)) \
402 * The 'R' command returns any overwriteable \
403 * characters in the first line to the original \
406 if (LF_ISSET(TXT_REPLACE) && tp->owrite && \
407 tp == tiqh->cqh_first) { \
408 memmove(tp->lb + sp->cno, \
409 lp + sp->cno, tp->owrite); \
410 tp->insert += tp->owrite; \
413 /* Delete any appended cursor. */ \
414 if (LF_ISSET(TXT_APPENDEOL)) { \
421 /* CR returns from the vi command line. */
422 if (LF_ISSET(TXT_CR
)) {
424 * If a script window and not the colon
425 * line, push a <cr> so it gets executed.
427 if (F_ISSET(sp
, S_SCRIPT
) &&
428 !LF_ISSET(TXT_INFOLINE
))
430 "\r", 1, 0, CH_NOMAP
);
435 * Historic practice was to delete any <blank>
436 * characters following the inserted newline.
437 * This affects the 'R', 'c', and 's' commands.
439 for (p
= tp
->lb
+ sp
->cno
+ tp
->owrite
;
440 tp
->insert
&& isblank(*p
);
441 ++p
, ++tp
->owrite
, --tp
->insert
);
444 * Move any remaining insert characters into
445 * a new TEXT structure.
447 if ((ntp
= text_init(sp
,
448 tp
->lb
+ sp
->cno
+ tp
->owrite
,
449 tp
->insert
, tp
->insert
+ 32)) == NULL
)
451 CIRCLEQ_INSERT_TAIL(tiqh
, ntp
, q
);
453 /* Set bookkeeping for the new line. */
454 ntp
->lno
= tp
->lno
+ 1;
455 ntp
->insert
= tp
->insert
;
458 * Note if the user inserted any characters on this
459 * line. Done before calling txt_ai_resolve() because
460 * it changes the value of sp->cno without making the
461 * corresponding changes to tp->ai.
463 tmp
= sp
->cno
<= tp
->ai
;
466 * Resolve autoindented characters for the old line.
467 * Reset the autoindent line value. 0^D keeps the ai
468 * line from changing, ^D changes the level, even if
469 * there are no characters in the old line. Note,
470 * if using the current tp structure, use the cursor
471 * as the length, the user may have erased autoindent
474 if (LF_ISSET(TXT_AUTOINDENT
)) {
475 txt_ai_resolve(sp
, tp
);
477 if (carat_st
== C_NOCHANGE
) {
479 OOBLNO
, &ait
, ait
.ai
, ntp
))
481 FREE_SPACE(sp
, ait
.lb
, ait
.lb_len
);
484 OOBLNO
, tp
, sp
->cno
, ntp
))
490 * If the user hasn't entered any characters, delete
491 * any autoindent characters.
494 * Historic vi didn't get the insert test right, if
495 * there were characters after the cursor, entering
496 * a <cr> left the autoindent characters on the line.
501 /* Reset bookkeeping for the old line. */
503 tp
->ai
= tp
->insert
= tp
->owrite
= 0;
505 /* New cursor position. */
508 /* New lines are TXT_APPENDEOL if nothing to insert. */
509 if (ntp
->insert
== 0) {
510 TBINC(sp
, tp
->lb
, tp
->lb_len
, tp
->len
+ 1);
511 LF_SET(TXT_APPENDEOL
);
512 ntp
->lb
[sp
->cno
] = CURSOR_CH
;
517 /* Update the old line. */
518 if (sp
->s_change(sp
, ep
, tp
->lno
, LINE_RESET
))
521 /* Swap old and new TEXT's. */
524 /* Reset the cursor. */
527 /* Update the new line. */
528 if (sp
->s_change(sp
, ep
, tp
->lno
, LINE_INSERT
))
531 /* Set the renumber bit. */
532 F_SET(sp
, S_RENUMBER
);
534 /* Refresh if nothing waiting. */
535 if ((margin
|| !KEYS_WAITING(sp
)) &&
536 sp
->s_refresh(sp
, ep
))
539 case K_ESCAPE
: /* Escape. */
540 if (!LF_ISSET(TXT_ESCAPE
))
546 * If there aren't any trailing characters in the line
547 * and the user hasn't entered any characters, delete
548 * the autoindent characters.
550 if (!tp
->insert
&& sp
->cno
<= tp
->ai
) {
551 tp
->len
= tp
->owrite
= 0;
553 } else if (LF_ISSET(TXT_AUTOINDENT
))
554 txt_ai_resolve(sp
, tp
);
556 /* If there are insert characters, copy them down. */
557 k_escape
: if (tp
->insert
&& tp
->owrite
)
558 memmove(tp
->lb
+ sp
->cno
,
559 tp
->lb
+ sp
->cno
+ tp
->owrite
, tp
->insert
);
560 tp
->len
-= tp
->owrite
;
563 * Delete any lines that were inserted into the text
564 * structure and then erased.
566 while (tp
->q
.cqe_next
!= (void *)tiqh
) {
567 ntp
= tp
->q
.cqe_next
;
568 CIRCLEQ_REMOVE(tiqh
, ntp
, q
);
573 * If not resolving the lines into the file, end
577 * This is wrong, should pass back a length.
579 if (LF_ISSET(TXT_RESOLVE
)) {
580 if (txt_resolve(sp
, ep
, tiqh
))
583 * Clear input flag -- input buffer no longer
588 TBINC(sp
, tp
->lb
, tp
->lb_len
, tp
->len
+ 1);
589 tp
->lb
[tp
->len
] = '\0';
593 * Set the return cursor position to rest on the last
594 * inserted character.
598 rp
->cno
= sp
->cno
? sp
->cno
- 1 : 0;
599 if (sp
->s_change(sp
, ep
, rp
->lno
, LINE_RESET
))
603 case K_CARAT
: /* Delete autoindent chars. */
604 if (LF_ISSET(TXT_AUTOINDENT
) && sp
->cno
<= tp
->ai
)
605 carat_st
= C_CARATSET
;
607 case K_ZERO
: /* Delete autoindent chars. */
608 if (LF_ISSET(TXT_AUTOINDENT
) && sp
->cno
<= tp
->ai
)
609 carat_st
= C_ZEROSET
;
611 case K_VEOF
: /* Delete autoindent char. */
613 * If in the first column or no characters to erase,
614 * ignore the ^D (this matches historic practice). If
615 * not doing autoindent or already inserted non-ai
616 * characters, it's a literal. The latter test is done
617 * in the switch, as the CARAT forms are N + 1, not N.
619 if (!LF_ISSET(TXT_AUTOINDENT
))
621 if (sp
->cno
== 0 || tp
->ai
== 0)
624 case C_CARATSET
: /* ^^D */
625 if (sp
->cno
> tp
->ai
+ tp
->offset
+ 1)
628 /* Save the ai string for later. */
631 TBINC(sp
, ait
.lb
, ait
.lb_len
, tp
->ai
);
632 memmove(ait
.lb
, tp
->lb
, tp
->ai
);
633 ait
.ai
= ait
.len
= tp
->ai
;
635 carat_st
= C_NOCHANGE
;
637 case C_ZEROSET
: /* 0^D */
638 if (sp
->cno
> tp
->ai
+ tp
->offset
+ 1)
641 leftmargin
: tp
->lb
[sp
->cno
- 1] = ' ';
642 tp
->owrite
+= sp
->cno
- tp
->offset
;
644 sp
->cno
= tp
->offset
;
646 case C_NOTSET
: /* ^D */
647 if (sp
->cno
> tp
->ai
+ tp
->offset
)
649 (void)txt_outdent(sp
, tp
);
655 case K_VERASE
: /* Erase the last character. */
657 * If can erase over the prompt, return. Len is 0
658 * if backspaced over the prompt, 1 if only CR entered.
660 if (LF_ISSET(TXT_BS
) && sp
->cno
<= tp
->offset
) {
666 * If at the beginning of the line, try and drop back
667 * to a previously inserted line.
670 if ((ntp
= txt_backup(sp
,
671 ep
, tiqh
, tp
, flags
)) == NULL
)
677 /* If nothing to erase, bell the user. */
678 if (sp
->cno
<= tp
->offset
) {
680 "No more characters to erase.");
684 /* Drop back one character. */
688 * Increment overwrite, decrement ai if deleted.
691 * Historic vi did not permit users to use erase
692 * characters to delete autoindent characters.
695 if (sp
->cno
< tp
->ai
)
698 case K_VWERASE
: /* Skip back one word. */
700 * If at the beginning of the line, try and drop back
701 * to a previously inserted line.
704 if ((ntp
= txt_backup(sp
,
705 ep
, tiqh
, tp
, flags
)) == NULL
)
711 * If at offset, nothing to erase so bell the user.
713 if (sp
->cno
<= tp
->offset
) {
715 "No more characters to erase.");
720 * First werase goes back to any autoindent
721 * and second werase goes back to the offset.
724 * Historic vi did not permit users to use erase
725 * characters to delete autoindent characters.
727 if (tp
->ai
&& sp
->cno
> tp
->ai
)
734 /* Skip over trailing space characters. */
735 while (sp
->cno
> max
&& isblank(tp
->lb
[sp
->cno
- 1])) {
742 * There are three types of word erase found on UNIX
743 * systems. They can be identified by how the string
744 * /a/b/c is treated -- as 1, 3, or 6 words. Historic
745 * vi had two classes of characters, and strings were
746 * delimited by them and <blank>'s, so, 6 words. The
747 * historic tty interface used <blank>'s to delimit
748 * strings, so, 1 word. The algorithm offered in the
749 * 4.4BSD tty interface (as stty altwerase) treats it
750 * as 3 words -- there are two classes of characters,
751 * and strings are delimited by them and <blank>'s.
752 * The difference is that the type of the first erased
753 * character erased is ignored, which is exactly right
754 * when erasing pathname components. Here, the options
755 * TXT_ALTWERASE and TXT_TTYWERASE specify the 4.4BSD
756 * tty interface and the historic tty driver behavior,
757 * respectively, and the default is the same as the
758 * historic vi behavior.
760 if (LF_ISSET(TXT_TTYWERASE
))
761 while (sp
->cno
> max
) {
764 if (isblank(tp
->lb
[sp
->cno
- 1]))
768 if (LF_ISSET(TXT_ALTWERASE
)) {
771 if (isblank(tp
->lb
[sp
->cno
- 1]))
775 tmp
= inword(tp
->lb
[sp
->cno
- 1]);
776 while (sp
->cno
> max
) {
779 if (tmp
!= inword(tp
->lb
[sp
->cno
- 1])
780 || isblank(tp
->lb
[sp
->cno
- 1]))
785 case K_VKILL
: /* Restart this line. */
787 * If at the beginning of the line, try and drop back
788 * to a previously inserted line.
791 if ((ntp
= txt_backup(sp
,
792 ep
, tiqh
, tp
, flags
)) == NULL
)
797 /* If at offset, nothing to erase so bell the user. */
798 if (sp
->cno
<= tp
->offset
) {
800 "No more characters to erase.");
805 * First kill goes back to any autoindent
806 * and second kill goes back to the offset.
809 * Historic vi did not permit users to use erase
810 * characters to delete autoindent characters.
812 if (tp
->ai
&& sp
->cno
> tp
->ai
)
818 tp
->owrite
+= sp
->cno
- max
;
821 case K_CNTRLT
: /* Add autoindent char. */
822 if (!LF_ISSET(TXT_CNTRLT
))
824 if (txt_indent(sp
, tp
))
828 (void)sp
->s_suspend(sp
);
830 #ifdef HISTORIC_PRACTICE_IS_TO_INSERT_NOT_REPAINT
832 F_SET(sp
, S_REFRESH
);
837 showmatch
= LF_ISSET(TXT_SHOWMATCH
);
839 case K_VLNEXT
: /* Quote the next character. */
840 /* If in hex mode, see if we've entered a hex value. */
841 if (hex
== H_INHEX
) {
842 if (txt_hex(sp
, tp
, &tmp
, ch
))
852 default: /* Insert the character. */
854 * If entering a space character after a word, check
855 * for abbreviations. If there was one, discard the
858 if (isblank(ch
) && abb
== A_NOTSPACE
&& !replay
) {
859 if (txt_abbrev(sp
, tp
, &tmp
, ch
))
862 if (LF_ISSET(TXT_RECORD
))
867 /* If in hex mode, see if we've entered a hex value. */
868 if (hex
== H_INHEX
&& !isxdigit(ch
)) {
869 if (txt_hex(sp
, tp
, &tmp
, ch
))
876 /* Check to see if we've crossed the margin. */
878 if (sp
->s_column(sp
, ep
, &col
))
881 if (txt_margin(sp
, tp
, &tmp
, ch
))
888 abb
= isblank(ch
) ? A_SPACE
: A_NOTSPACE
;
890 if (tp
->owrite
) /* Overwrite a character. */
892 else if (tp
->insert
) { /* Insert a character. */
895 tp
->lb
[sp
->cno
+ 1] = tp
->lb
[sp
->cno
];
897 memmove(tp
->lb
+ sp
->cno
+ 1,
898 tp
->lb
+ sp
->cno
, tp
->insert
);
901 tp
->lb
[sp
->cno
++] = ch
;
904 * If we've reached the end of the buffer, then we
905 * need to switch into insert mode. This happens
906 * when there's a change to a mark and the user puts
907 * in more characters than the length of the motion.
909 ebuf_chk
: if (sp
->cno
>= tp
->len
) {
910 TBINC(sp
, tp
->lb
, tp
->lb_len
, tp
->len
+ 1);
911 LF_SET(TXT_APPENDEOL
);
912 tp
->lb
[sp
->cno
] = CURSOR_CH
;
917 if (hex
== H_NEXTCHAR
)
919 if (quoted
== Q_NEXTCHAR
)
923 #if defined(DEBUG) && 1
924 if (sp
->cno
+ tp
->insert
+ tp
->owrite
!= tp
->len
)
926 "len %u != cno: %u ai: %u insert %u overwrite %u",
927 tp
->len
, sp
->cno
, tp
->ai
, tp
->insert
, tp
->owrite
);
928 tp
->len
= sp
->cno
+ tp
->insert
+ tp
->owrite
;
932 /* Clear input flag. */
933 ret
: F_CLR(sp
, S_INPUT
);
935 if (LF_ISSET(TXT_RECORD
))
936 VIP(sp
)->rep_cnt
= rcol
;
941 txt_err(sp
, ep
, tiqh
);
947 * Handle abbreviations.
950 txt_abbrev(sp
, tp
, didsubp
, pushc
)
961 /* Find the beginning of this "word". */
962 for (off
= sp
->cno
- 1, p
= tp
->lb
+ off
, len
= 0;; --p
, --off
) {
968 if (off
== tp
->ai
|| off
== tp
->offset
)
972 /* Check for any abbreviations. */
973 if ((qp
= seq_find(sp
, NULL
, p
, len
, SEQ_ABBREV
, NULL
)) == NULL
) {
979 * Push the abbreviation onto the tty stack. Historically, characters
980 * resulting from an abbreviation expansion were themselves subject to
981 * map expansions, O_SHOWMATCH matching etc. This means the expanded
982 * characters will be re-tested for abbreviations. It's difficult to
983 * know what historic practice in this case was, since abbreviations
984 * were applied to :colon command lines, so entering abbreviations that
985 * looped was tricky, although possible. In addition, obvious loops
986 * didn't work as expected. (The command ':ab a b|ab b c|ab c a' will
987 * silently only implement and/or display the last abbreviation.)
989 * This implementation doesn't recover well from such abbreviations.
990 * The main input loop counts abbreviated characters, and, when it
991 * reaches a limit, discards any abbreviated characters on the queue.
992 * It's difficult to back up to the original position, as the replay
993 * queue would have to be adjusted, and the line state when an initial
994 * abbreviated character was received would have to be saved.
997 if (term_push(sp
, &ch
, 1, 0, CH_ABBREVIATED
))
999 if (term_push(sp
, qp
->output
, qp
->olen
, 0, CH_ABBREVIATED
))
1003 * Move the cursor to the start of the abbreviation,
1004 * adjust the length.
1009 /* Copy any insert characters back. */
1011 memmove(tp
->lb
+ sp
->cno
+ tp
->owrite
,
1012 tp
->lb
+ sp
->cno
+ tp
->owrite
+ len
, tp
->insert
);
1015 * We return the length of the abbreviated characters. This is so
1016 * the calling routine can replace the replay characters with the
1017 * abbreviation. This means that subsequent '.' commands will produce
1018 * the same text, regardless of intervening :[un]abbreviate commands.
1019 * This is historic practice.
1025 /* Offset to next column of stop size. */
1026 #define STOP_OFF(c, stop) (stop - (c) % stop)
1030 * When a line is resolved by <esc> or <cr>, review autoindent
1034 txt_ai_resolve(sp
, tp
)
1040 size_t cno
, len
, new, old
, scno
, spaces
, tab_after_sp
, tabs
;
1044 * If the line is empty, has an offset, or no autoindent
1045 * characters, we're done.
1047 if (!tp
->len
|| tp
->offset
|| !tp
->ai
)
1051 * The autoindent characters plus any leading <blank> characters
1052 * in the line are resolved into the minimum number of characters.
1053 * Historic practice.
1055 ts
= O_VAL(sp
, O_TABSTOP
);
1057 /* Figure out the last <blank> screen column. */
1058 for (p
= tp
->lb
, scno
= 0, len
= tp
->len
,
1059 spaces
= tab_after_sp
= 0; len
-- && isblank(*p
); ++p
)
1063 scno
+= STOP_OFF(scno
, ts
);
1070 * If there are no spaces, or no tabs after spaces and less than
1071 * ts spaces, it's already minimal.
1073 if (!spaces
|| !tab_after_sp
&& spaces
< ts
)
1076 /* Count up spaces/tabs needed to get to the target. */
1077 for (cno
= 0, tabs
= 0; cno
+ STOP_OFF(cno
, ts
) <= scno
; ++tabs
)
1078 cno
+= STOP_OFF(cno
, ts
);
1079 spaces
= scno
- cno
;
1082 * Figure out how many characters we're dropping -- if we're not
1083 * dropping any, it's already minimal, we're done.
1086 new = spaces
+ tabs
;
1090 /* Shift the rest of the characters down, adjust the counts. */
1092 memmove(p
- del
, p
, tp
->len
- old
);
1096 /* Fill in space/tab characters. */
1097 for (p
= tp
->lb
; tabs
--;)
1105 * Handle autoindent. If aitp isn't NULL, use it, otherwise,
1106 * retrieve the line.
1109 txt_auto(sp
, ep
, lno
, aitp
, len
, tp
)
1120 if ((p
= t
= file_gline(sp
, ep
, lno
, &len
)) == NULL
)
1124 for (nlen
= 0; len
; ++p
) {
1127 /* If last character is a space, it counts. */
1134 /* No indentation. */
1141 /* Make sure the buffer's big enough. */
1142 BINC_RET(sp
, tp
->lb
, tp
->lb_len
, tp
->len
+ nlen
);
1144 /* Copy the indentation into the new buffer. */
1145 memmove(tp
->lb
+ nlen
, tp
->lb
, tp
->len
);
1146 memmove(tp
->lb
, t
, nlen
);
1149 /* Return the additional length. */
1156 * Back up to the previously edited line.
1159 txt_backup(sp
, ep
, tiqh
, tp
, flags
)
1169 if (tp
->q
.cqe_prev
== (void *)tiqh
) {
1170 msgq(sp
, M_BERR
, "Already at the beginning of the insert");
1174 /* Update the old line on the screen. */
1175 if (sp
->s_change(sp
, ep
, tp
->lno
, LINE_DELETE
))
1178 /* Get a handle on the previous TEXT structure. */
1179 ntp
= tp
->q
.cqe_prev
;
1181 /* Make sure that we can get enough space. */
1182 if (LF_ISSET(TXT_APPENDEOL
) && ntp
->len
+ 1 > ntp
->lb_len
&&
1183 binc(sp
, &ntp
->lb
, &ntp
->lb_len
, ntp
->len
+ 1))
1187 * Release current TEXT; now committed to the swap, nothing
1190 CIRCLEQ_REMOVE(tiqh
, tp
, q
);
1196 /* Set bookkeeping information. */
1198 if (LF_ISSET(TXT_APPENDEOL
)) {
1199 tp
->lb
[col
] = CURSOR_CH
;
1210 * Handle an error during input processing.
1213 txt_err(sp
, ep
, tiqh
)
1222 * The problem with input processing is that the cursor is at an
1223 * indeterminate position since some input may have been lost due
1224 * to a malloc error. So, try to go back to the place from which
1225 * the cursor started, knowing that it may no longer be available.
1227 * We depend on at least one line number being set in the text
1230 for (lno
= tiqh
->cqh_first
->lno
;
1231 file_gline(sp
, ep
, lno
, &len
) == NULL
&& lno
> 0; --lno
);
1233 sp
->lno
= lno
== 0 ? 1 : lno
;
1236 /* Redraw the screen, just in case. */
1237 F_SET(sp
, S_REDRAW
);
1242 * Let the user insert any character value they want.
1245 * This is an extension. The pattern "^Vx[0-9a-fA-F]*" is a way
1246 * for the user to specify a character value which their keyboard
1247 * may not be able to enter.
1250 txt_hex(sp
, tp
, was_hex
, pushc
)
1262 * Null-terminate the string. Since nul isn't a legal hex value,
1263 * this should be okay, and lets us use a local routine, which
1264 * presumably understands the character set, to convert the value.
1266 savec
= tp
->lb
[sp
->cno
];
1267 tp
->lb
[sp
->cno
] = 0;
1269 /* Find the previous HEX_CH. */
1270 for (off
= sp
->cno
- 1, p
= tp
->lb
+ off
, len
= 0;; --p
, --off
) {
1276 /* If not on this line, there's nothing to do. */
1277 if (off
== tp
->ai
|| off
== tp
->offset
)
1281 /* If no length, then it wasn't a hex value. */
1285 /* Get the value. */
1286 value
= strtol(wp
, NULL
, 16);
1287 if (value
== LONG_MIN
|| value
== LONG_MAX
|| value
> MAX_CHAR_T
) {
1288 nothex
: tp
->lb
[sp
->cno
] = savec
;
1294 if (term_push(sp
, &ch
, 1, 0, CH_NOMAP
| CH_QUOTED
))
1297 if (term_push(sp
, &ch
, 1, 0, CH_NOMAP
| CH_QUOTED
))
1300 tp
->lb
[sp
->cno
] = savec
;
1302 /* Move the cursor to the start of the hex value, adjust the length. */
1306 /* Copy any insert characters back. */
1308 memmove(tp
->lb
+ sp
->cno
+ tp
->owrite
,
1309 tp
->lb
+ sp
->cno
+ tp
->owrite
+ len
+ 1, tp
->insert
);
1316 * Txt_indent and txt_outdent are truly strange. ^T and ^D do movements
1317 * to the next or previous shiftwidth value, i.e. for a 1-based numbering,
1318 * with shiftwidth=3, ^T moves a cursor on the 7th, 8th or 9th column to
1319 * the 10th column, and ^D moves it back.
1322 * The ^T and ^D characters in historical vi only had special meaning when
1323 * they were the first characters typed after entering text input mode.
1324 * Since normal erase characters couldn't erase autoindent (in this case
1325 * ^T) characters, this meant that inserting text into previously existing
1326 * text was quite strange, ^T only worked if it was the first keystroke,
1327 * and then it could only be erased by using ^D. This implementation treats
1328 * ^T specially anywhere it occurs in the input, and permits the standard
1329 * erase characters to erase characters inserted using it.
1332 * Technically, txt_indent, txt_outdent should part of the screen interface,
1333 * as they require knowledge of the size of a space character on the screen.
1334 * (Not the size of tabs, because tabs are logically composed of spaces.)
1335 * They're left in the text code because they're complicated, not to mention
1336 * the gruesome awareness that if spaces aren't a single column on the screen
1337 * for any language, we're into some serious, ah, for lack of a better word,
1343 * Handle ^T indents.
1351 size_t cno
, off
, scno
, spaces
, tabs
;
1353 ts
= O_VAL(sp
, O_TABSTOP
);
1354 sw
= O_VAL(sp
, O_SHIFTWIDTH
);
1356 /* Get the current screen column. */
1357 for (off
= scno
= 0; off
< sp
->cno
; ++off
)
1358 if (tp
->lb
[off
] == '\t')
1359 scno
+= STOP_OFF(scno
, ts
);
1363 /* Count up spaces/tabs needed to get to the target. */
1364 for (cno
= scno
, scno
+= STOP_OFF(scno
, sw
), tabs
= 0;
1365 cno
+ STOP_OFF(cno
, ts
) <= scno
; ++tabs
)
1366 cno
+= STOP_OFF(cno
, ts
);
1367 spaces
= scno
- cno
;
1369 /* Put space/tab characters in place of any overwrite characters. */
1370 for (; tp
->owrite
&& tabs
; --tp
->owrite
, --tabs
, ++tp
->ai
)
1371 tp
->lb
[sp
->cno
++] = '\t';
1372 for (; tp
->owrite
&& spaces
; --tp
->owrite
, --spaces
, ++tp
->ai
)
1373 tp
->lb
[sp
->cno
++] = ' ';
1375 if (!tabs
&& !spaces
)
1378 /* Make sure there's enough room. */
1379 BINC_RET(sp
, tp
->lb
, tp
->lb_len
, tp
->len
+ spaces
+ tabs
);
1381 /* Move the insert characters out of the way. */
1383 memmove(tp
->lb
+ sp
->cno
+ spaces
+ tabs
,
1384 tp
->lb
+ sp
->cno
, tp
->insert
);
1386 /* Add new space/tab characters. */
1387 for (; tabs
--; ++tp
->len
, ++tp
->ai
)
1388 tp
->lb
[sp
->cno
++] = '\t';
1389 for (; spaces
--; ++tp
->len
, ++tp
->ai
)
1390 tp
->lb
[sp
->cno
++] = ' ';
1396 * Handle ^D outdents.
1405 size_t cno
, off
, scno
, spaces
;
1407 ts
= O_VAL(sp
, O_TABSTOP
);
1408 sw
= O_VAL(sp
, O_SHIFTWIDTH
);
1410 /* Get the current screen column. */
1411 for (off
= scno
= 0; off
< sp
->cno
; ++off
)
1412 if (tp
->lb
[off
] == '\t')
1413 scno
+= STOP_OFF(scno
, ts
);
1417 /* Get the previous shiftwidth column. */
1418 for (cno
= scno
; --scno
% sw
!= 0;);
1420 /* Decrement characters until less than or equal to that slot. */
1421 for (; cno
> scno
; --sp
->cno
, --tp
->ai
, ++tp
->owrite
)
1422 if (tp
->lb
[--off
] == '\t')
1423 cno
-= STOP_OFF(cno
, ts
);
1427 /* Spaces needed to get to the target. */
1428 spaces
= scno
- cno
;
1430 /* Maybe just a delete. */
1434 /* Make sure there's enough room. */
1435 BINC_RET(sp
, tp
->lb
, tp
->lb_len
, tp
->len
+ spaces
);
1437 /* Use up any overwrite characters. */
1438 for (; tp
->owrite
&& spaces
; --spaces
, ++tp
->ai
, --tp
->owrite
)
1439 tp
->lb
[sp
->cno
++] = ' ';
1441 /* Maybe that was enough. */
1445 /* Move the insert characters out of the way. */
1447 memmove(tp
->lb
+ sp
->cno
+ spaces
,
1448 tp
->lb
+ sp
->cno
, tp
->insert
);
1450 /* Add new space characters. */
1451 for (; spaces
--; ++tp
->len
, ++tp
->ai
)
1452 tp
->lb
[sp
->cno
++] = ' ';
1458 * Resolve the input text chain into the file.
1461 txt_resolve(sp
, ep
, tiqh
)
1469 /* The first line replaces a current line. */
1470 tp
= tiqh
->cqh_first
;
1471 if (file_sline(sp
, ep
, tp
->lno
, tp
->lb
, tp
->len
))
1474 /* All subsequent lines are appended into the file. */
1475 for (lno
= tp
->lno
; (tp
= tp
->q
.cqe_next
) != (void *)&sp
->tiq
; ++lno
)
1476 if (file_aline(sp
, ep
, 0, lno
, tp
->lb
, tp
->len
))
1483 * Show a character match.
1486 * Historic vi tried to display matches even in the :colon command line.
1490 txt_showmatch(sp
, ep
)
1494 struct timeval second
;
1498 int cnt
, endc
, startc
;
1501 * Do a refresh first, in case the v_ntext() code hasn't done
1502 * one in awhile, so the user can see what we're complaining
1505 if (sp
->s_refresh(sp
, ep
))
1508 * We don't display the match if it's not on the screen. Find
1509 * out what the first character on the screen is.
1511 if (sp
->s_position(sp
, ep
, &m
, 0, P_TOP
))
1514 /* Initialize the getc() interface. */
1515 cs
.cs_lno
= sp
->lno
;
1516 cs
.cs_cno
= sp
->cno
- 1;
1517 if (cs_init(sp
, ep
, &cs
))
1519 startc
= (endc
= cs
.cs_ch
) == ')' ? '(' : '{';
1521 /* Search for the match. */
1523 if (cs_prev(sp
, ep
, &cs
))
1525 if (cs
.cs_lno
< m
.lno
||
1526 cs
.cs_lno
== m
.lno
&& cs
.cs_cno
< m
.cno
)
1528 if (cs
.cs_flags
!= 0) {
1529 if (cs
.cs_flags
== CS_EOF
|| cs
.cs_flags
== CS_SOF
) {
1530 (void)sp
->s_bell(sp
);
1535 if (cs
.cs_ch
== endc
)
1537 else if (cs
.cs_ch
== startc
&& --cnt
== 0)
1541 /* Move to the match. */
1544 sp
->lno
= cs
.cs_lno
;
1545 sp
->cno
= cs
.cs_cno
;
1546 (void)sp
->s_refresh(sp
, ep
);
1549 * Sleep(3) is eight system calls. Do it fast -- besides,
1550 * I don't want to wait an entire second.
1553 second
.tv_sec
= O_VAL(sp
, O_MATCHTIME
) / 10;
1554 second
.tv_usec
= (O_VAL(sp
, O_MATCHTIME
) % 10) * 100000L;
1555 (void)select(0, &zero
, &zero
, &zero
, &second
);
1557 /* Return to the current location. */
1560 (void)sp
->s_refresh(sp
, ep
);
1565 * Handle margin wrap.
1568 * Historic vi belled the user each time a character was entered after
1569 * crossing the margin until a space was entered which could be used to
1570 * break the line. I don't, it tends to wake the cats.
1573 txt_margin(sp
, tp
, didbreak
, pushc
)
1580 size_t len
, off
, tlen
;
1583 /* Find the closest previous blank. */
1584 for (off
= sp
->cno
- 1, p
= tp
->lb
+ off
, len
= 0;; --p
, --off
) {
1590 /* If it's the beginning of the line, there's nothing to do. */
1591 if (off
== tp
->ai
|| off
== tp
->offset
) {
1598 * Historic practice is to delete any trailing whitespace
1599 * from the previous line.
1601 for (tlen
= len
;; --p
, --off
) {
1605 if (off
== tp
->ai
|| off
== tp
->offset
)
1610 if (term_push(sp
, &ch
, 1, 0, CH_NOMAP
| CH_QUOTED
))
1612 if (len
&& term_push(sp
, wp
, len
, 0, CH_NOMAP
| CH_QUOTED
))
1615 if (term_push(sp
, &ch
, 1, 0, CH_NOMAP
))