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 8.65 1993/12/19 19:00:32 bostic Exp $ (Berkeley) $Date: 1993/12/19 19:00:32 $";
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 * Setting margin causes a significant performance hit. Normally
230 * we don't update the screen if there are keys waiting, but we
231 * have to if margin is set, otherwise the screen routines don't
232 * know where the cursor is.
234 if (!LF_ISSET(TXT_WRAPMARGIN
))
236 else if ((margin
= O_VAL(sp
, O_WRAPMARGIN
)) != 0)
237 margin
= sp
->cols
- margin
;
239 /* Initialize abbreviations checks. */
240 if (F_ISSET(sp
, S_ABBREV
) && LF_ISSET(TXT_MAPINPUT
)) {
247 * Set up the dot command. Dot commands are done by saving the
248 * actual characters and replaying the input. We have to push
249 * the characters onto the key stack and then handle them normally,
250 * otherwise things like wrapmargin will fail.
253 * It would be nice if we could swallow backspaces and such, but
254 * it's not all that easy to do. Another possibility would be to
255 * recognize full line insertions, which could be performed quickly,
260 if (replay
= LF_ISSET(TXT_REPLAY
)) {
263 * Historically, it wasn't an error to replay non-existent
264 * input. This test is necessary, we get here by the user
265 * doing an input command followed by a nul.
268 * Historically, vi did not remap or reabbreviate replayed
269 * input. It did, however, beep at you if you changed an
270 * abbreviation and then replayed the input. We're not that
273 if (VIP(sp
)->rep
== NULL
)
275 if (term_push(sp
, VIP(sp
)->rep
, VIP(sp
)->rep_cnt
, 0, CH_NOMAP
))
283 iflags
= LF_ISSET(TXT_MAPCOMMAND
| TXT_MAPINPUT
);
284 for (gp
= sp
->gp
, showmatch
= 0,
285 carat_st
= C_NOTSET
, hex
= H_NOTSET
, quoted
= Q_NOTSET
;;) {
287 * Reset the line and update the screen. (The txt_showmatch()
288 * code refreshes the screen for us.) Don't refresh unless
289 * we're about to wait on a character or we need to know where
290 * the cursor really is.
292 if (showmatch
|| margin
|| !KEYS_WAITING(sp
)) {
293 if (sp
->s_change(sp
, ep
, tp
->lno
, LINE_RESET
))
297 txt_showmatch(sp
, ep
);
298 } else if (sp
->s_refresh(sp
, ep
))
302 /* Get the next character. */
303 next_ch
: if (term_key(sp
, &ikey
, iflags
) != INP_OK
)
307 /* Abbreviation check. See comment in txt_abbrev(). */
308 #define MAX_ABBREVIATION_EXPANSION 256
309 if (ikey
.flags
& CH_ABBREVIATED
) {
310 if (++ab_cnt
> MAX_ABBREVIATION_EXPANSION
) {
312 "Abbreviation exceeded maximum number of characters");
321 * Historic feature. If the first character of the input is
322 * a nul, replay the previous input. This isn't documented
323 * anywhere, and is a great test of vi clones.
325 if (ch
== '\0' && testnr
) {
332 * Check to see if the character fits into the input (and
333 * replay, if necessary) buffers. It isn't necessary to
334 * have tp->len bytes, since it doesn't consider overwrite
335 * characters, but not worth fixing.
337 if (LF_ISSET(TXT_RECORD
)) {
338 TBINC(sp
, VIP(sp
)->rep
, VIP(sp
)->rep_len
, rcol
+ 1);
339 VIP(sp
)->rep
[rcol
++] = ch
;
341 TBINC(sp
, tp
->lb
, tp
->lb_len
, tp
->len
+ 1);
344 * If the character was quoted, replace the last character
345 * (the literal mark) with the new character. If quoted
346 * by someone else, simply insert the character.
349 * Extension -- if the quoted character is HEX_CH, enter hex
350 * mode. If the user enters "<HEX_CH>[isxdigit()]*" we will
351 * try to use the value as a character. Anything else resets
354 if (ikey
.flags
& CH_QUOTED
)
356 if (quoted
== Q_THISCHAR
) {
366 switch (ikey
.value
) {
368 case K_NL
: /* New line. */
369 #define LINE_RESOLVE { \
371 * Handle abbreviations. If there was one, \
372 * discard the replay characters. \
374 if (abb == A_NOTSPACE && !replay) { \
375 if (txt_abbrev(sp, tp, &tmp, ch)) \
378 if (LF_ISSET(TXT_RECORD)) \
383 if (abb != A_NOTSET) \
385 /* Handle hex numbers. */ \
386 if (hex == H_INHEX) { \
387 if (txt_hex(sp, tp, &tmp, ch)) \
395 * The 'R' command returns any overwriteable \
396 * characters in the first line to the original \
399 if (LF_ISSET(TXT_REPLACE) && tp->owrite && \
400 tp == tiqh->cqh_first) { \
401 memmove(tp->lb + sp->cno, \
402 lp + sp->cno, tp->owrite); \
403 tp->insert += tp->owrite; \
406 /* Delete any appended cursor. */ \
407 if (LF_ISSET(TXT_APPENDEOL)) { \
414 /* CR returns from the vi command line. */
415 if (LF_ISSET(TXT_CR
)) {
417 * If a script window and not the colon
418 * line, push a <cr> so it gets executed.
420 if (F_ISSET(sp
, S_SCRIPT
) &&
421 !LF_ISSET(TXT_INFOLINE
))
423 "\r", 1, 0, CH_NOMAP
);
428 * Historic practice was to delete any <blank>
429 * characters following the inserted newline.
430 * This affects the 'R', 'c', and 's' commands.
432 for (p
= tp
->lb
+ sp
->cno
+ tp
->owrite
;
433 tp
->insert
&& isblank(*p
);
434 ++p
, ++tp
->owrite
, --tp
->insert
);
437 * Move any remaining insert characters into
438 * a new TEXT structure.
440 if ((ntp
= text_init(sp
,
441 tp
->lb
+ sp
->cno
+ tp
->owrite
,
442 tp
->insert
, tp
->insert
+ 32)) == NULL
)
444 CIRCLEQ_INSERT_TAIL(tiqh
, ntp
, q
);
446 /* Set bookkeeping for the new line. */
447 ntp
->lno
= tp
->lno
+ 1;
448 ntp
->insert
= tp
->insert
;
451 * Note if the user inserted any characters on this
452 * line. Done before calling txt_ai_resolve() because
453 * it changes the value of sp->cno without making the
454 * corresponding changes to tp->ai.
456 tmp
= sp
->cno
<= tp
->ai
;
459 * Resolve autoindented characters for the old line.
460 * Reset the autoindent line value. 0^D keeps the ai
461 * line from changing, ^D changes the level, even if
462 * there are no characters in the old line. Note,
463 * if using the current tp structure, use the cursor
464 * as the length, the user may have erased autoindent
467 if (LF_ISSET(TXT_AUTOINDENT
)) {
468 txt_ai_resolve(sp
, tp
);
470 if (carat_st
== C_NOCHANGE
) {
472 OOBLNO
, &ait
, ait
.ai
, ntp
))
474 FREE_SPACE(sp
, ait
.lb
, ait
.lb_len
);
477 OOBLNO
, tp
, sp
->cno
, ntp
))
483 * If the user hasn't entered any characters, delete
484 * any autoindent characters.
487 * Historic vi didn't get the insert test right, if
488 * there were characters after the cursor, entering
489 * a <cr> left the autoindent characters on the line.
494 /* Reset bookkeeping for the old line. */
496 tp
->ai
= tp
->insert
= tp
->owrite
= 0;
498 /* New cursor position. */
501 /* New lines are TXT_APPENDEOL if nothing to insert. */
502 if (ntp
->insert
== 0) {
503 TBINC(sp
, tp
->lb
, tp
->lb_len
, tp
->len
+ 1);
504 LF_SET(TXT_APPENDEOL
);
505 ntp
->lb
[sp
->cno
] = CURSOR_CH
;
510 /* Update the old line. */
511 if (sp
->s_change(sp
, ep
, tp
->lno
, LINE_RESET
))
514 /* Swap old and new TEXT's. */
517 /* Reset the cursor. */
520 /* Update the new line. */
521 if (sp
->s_change(sp
, ep
, tp
->lno
, LINE_INSERT
))
524 /* Set the renumber bit. */
525 F_SET(sp
, S_RENUMBER
);
527 /* Refresh if nothing waiting. */
528 if ((margin
|| !KEYS_WAITING(sp
)) &&
529 sp
->s_refresh(sp
, ep
))
532 case K_ESCAPE
: /* Escape. */
533 if (!LF_ISSET(TXT_ESCAPE
))
539 * If there aren't any trailing characters in the line
540 * and the user hasn't entered any characters, delete
541 * the autoindent characters.
543 if (!tp
->insert
&& sp
->cno
<= tp
->ai
) {
544 tp
->len
= tp
->owrite
= 0;
546 } else if (LF_ISSET(TXT_AUTOINDENT
))
547 txt_ai_resolve(sp
, tp
);
549 /* If there are insert characters, copy them down. */
550 k_escape
: if (tp
->insert
&& tp
->owrite
)
551 memmove(tp
->lb
+ sp
->cno
,
552 tp
->lb
+ sp
->cno
+ tp
->owrite
, tp
->insert
);
553 tp
->len
-= tp
->owrite
;
556 * Delete any lines that were inserted into the text
557 * structure and then erased.
559 while (tp
->q
.cqe_next
!= (void *)tiqh
) {
560 ntp
= tp
->q
.cqe_next
;
561 CIRCLEQ_REMOVE(tiqh
, ntp
, q
);
566 * If not resolving the lines into the file, end
570 * This is wrong, should pass back a length.
572 if (LF_ISSET(TXT_RESOLVE
)) {
573 if (txt_resolve(sp
, ep
, tiqh
))
576 TBINC(sp
, tp
->lb
, tp
->lb_len
, tp
->len
+ 1);
577 tp
->lb
[tp
->len
] = '\0';
581 * Set the return cursor position to rest on the last
582 * inserted character.
586 rp
->cno
= sp
->cno
? sp
->cno
- 1 : 0;
587 if (sp
->s_change(sp
, ep
, rp
->lno
, LINE_RESET
))
591 case K_CARAT
: /* Delete autoindent chars. */
592 if (LF_ISSET(TXT_AUTOINDENT
) && sp
->cno
<= tp
->ai
)
593 carat_st
= C_CARATSET
;
595 case K_ZERO
: /* Delete autoindent chars. */
596 if (LF_ISSET(TXT_AUTOINDENT
) && sp
->cno
<= tp
->ai
)
597 carat_st
= C_ZEROSET
;
599 case K_VEOF
: /* Delete autoindent char. */
601 * If not doing autoindent, in the first column, no
602 * characters to erase, or already inserted non-ai
603 * characters, it's a literal. The last test is done
604 * in the switch, as the CARAT forms are N + 1, not N.
606 if (!LF_ISSET(TXT_AUTOINDENT
) ||
607 sp
->cno
== 0 || tp
->ai
== 0)
610 case C_CARATSET
: /* ^^D */
611 if (sp
->cno
> tp
->ai
+ tp
->offset
+ 1)
614 /* Save the ai string for later. */
617 TBINC(sp
, ait
.lb
, ait
.lb_len
, tp
->ai
);
618 memmove(ait
.lb
, tp
->lb
, tp
->ai
);
619 ait
.ai
= ait
.len
= tp
->ai
;
621 carat_st
= C_NOCHANGE
;
623 case C_ZEROSET
: /* 0^D */
624 if (sp
->cno
> tp
->ai
+ tp
->offset
+ 1)
627 leftmargin
: tp
->lb
[sp
->cno
- 1] = ' ';
628 tp
->owrite
+= sp
->cno
- tp
->offset
;
630 sp
->cno
= tp
->offset
;
632 case C_NOTSET
: /* ^D */
633 if (sp
->cno
> tp
->ai
+ tp
->offset
)
635 (void)txt_outdent(sp
, tp
);
641 case K_VERASE
: /* Erase the last character. */
643 * If can erase over the prompt, return. Len is 0
644 * if backspaced over the prompt, 1 if only CR entered.
646 if (LF_ISSET(TXT_BS
) && sp
->cno
<= tp
->offset
) {
652 * If at the beginning of the line, try and drop back
653 * to a previously inserted line.
656 if ((ntp
= txt_backup(sp
,
657 ep
, tiqh
, tp
, flags
)) == NULL
)
663 /* If nothing to erase, bell the user. */
664 if (sp
->cno
<= tp
->offset
) {
666 "No more characters to erase.");
670 /* Drop back one character. */
674 * Increment overwrite, decrement ai if deleted.
677 * Historic vi did not permit users to use erase
678 * characters to delete autoindent characters.
681 if (sp
->cno
< tp
->ai
)
684 case K_VWERASE
: /* Skip back one word. */
686 * If at the beginning of the line, try and drop back
687 * to a previously inserted line.
690 if ((ntp
= txt_backup(sp
,
691 ep
, tiqh
, tp
, flags
)) == NULL
)
697 * If at offset, nothing to erase so bell the user.
699 if (sp
->cno
<= tp
->offset
) {
701 "No more characters to erase.");
706 * First werase goes back to any autoindent
707 * and second werase goes back to the offset.
710 * Historic vi did not permit users to use erase
711 * characters to delete autoindent characters.
713 if (tp
->ai
&& sp
->cno
> tp
->ai
)
720 /* Skip over trailing space characters. */
721 while (sp
->cno
> max
&& isblank(tp
->lb
[sp
->cno
- 1])) {
728 * There are three types of word erase found on UNIX
729 * systems. They can be identified by how the string
730 * /a/b/c is treated -- as 1, 3, or 6 words. Historic
731 * vi had two classes of characters, and strings were
732 * delimited by them and <blank>'s, so, 6 words. The
733 * historic tty interface used <blank>'s to delimit
734 * strings, so, 1 word. The algorithm offered in the
735 * 4.4BSD tty interface (as stty altwerase) treats it
736 * as 3 words -- there are two classes of characters,
737 * and strings are delimited by them and <blank>'s.
738 * The difference is that the type of the first erased
739 * character erased is ignored, which is exactly right
740 * when erasing pathname components. Here, the options
741 * TXT_ALTWERASE and TXT_TTYWERASE specify the 4.4BSD
742 * tty interface and the historic tty driver behavior,
743 * respectively, and the default is the same as the
744 * historic vi behavior.
746 if (LF_ISSET(TXT_TTYWERASE
))
747 while (sp
->cno
> max
) {
750 if (isblank(tp
->lb
[sp
->cno
- 1]))
754 if (LF_ISSET(TXT_ALTWERASE
)) {
757 if (isblank(tp
->lb
[sp
->cno
- 1]))
761 tmp
= inword(tp
->lb
[sp
->cno
- 1]);
762 while (sp
->cno
> max
) {
765 if (tmp
!= inword(tp
->lb
[sp
->cno
- 1])
766 || isblank(tp
->lb
[sp
->cno
- 1]))
771 case K_VKILL
: /* Restart this line. */
773 * If at the beginning of the line, try and drop back
774 * to a previously inserted line.
777 if ((ntp
= txt_backup(sp
,
778 ep
, tiqh
, tp
, flags
)) == NULL
)
783 /* If at offset, nothing to erase so bell the user. */
784 if (sp
->cno
<= tp
->offset
) {
786 "No more characters to erase.");
791 * First kill goes back to any autoindent
792 * and second kill goes back to the offset.
795 * Historic vi did not permit users to use erase
796 * characters to delete autoindent characters.
798 if (tp
->ai
&& sp
->cno
> tp
->ai
)
804 tp
->owrite
+= sp
->cno
- max
;
807 case K_CNTRLT
: /* Add autoindent char. */
808 if (!LF_ISSET(TXT_CNTRLT
))
810 if (txt_indent(sp
, tp
))
814 (void)sp
->s_suspend(sp
);
816 #ifdef HISTORIC_PRACTICE_IS_TO_INSERT_NOT_REPAINT
818 F_SET(sp
, S_REFRESH
);
823 showmatch
= LF_ISSET(TXT_SHOWMATCH
);
825 case K_VLNEXT
: /* Quote the next character. */
826 /* If in hex mode, see if we've entered a hex value. */
827 if (hex
== H_INHEX
) {
828 if (txt_hex(sp
, tp
, &tmp
, ch
))
838 default: /* Insert the character. */
840 * If entering a space character after a word, check
841 * for abbreviations. If there was one, discard the
844 if (isblank(ch
) && abb
== A_NOTSPACE
&& !replay
) {
845 if (txt_abbrev(sp
, tp
, &tmp
, ch
))
848 if (LF_ISSET(TXT_RECORD
))
853 /* If in hex mode, see if we've entered a hex value. */
854 if (hex
== H_INHEX
&& !isxdigit(ch
)) {
855 if (txt_hex(sp
, tp
, &tmp
, ch
))
862 /* Check to see if we've crossed the margin. */
864 if (sp
->s_column(sp
, ep
, &col
))
867 if (txt_margin(sp
, tp
, &tmp
, ch
))
874 abb
= isblank(ch
) ? A_SPACE
: A_NOTSPACE
;
876 if (tp
->owrite
) /* Overwrite a character. */
878 else if (tp
->insert
) { /* Insert a character. */
881 tp
->lb
[sp
->cno
+ 1] = tp
->lb
[sp
->cno
];
883 memmove(tp
->lb
+ sp
->cno
+ 1,
884 tp
->lb
+ sp
->cno
, tp
->insert
);
887 tp
->lb
[sp
->cno
++] = ch
;
890 * If we've reached the end of the buffer, then we
891 * need to switch into insert mode. This happens
892 * when there's a change to a mark and the user puts
893 * in more characters than the length of the motion.
895 ebuf_chk
: if (sp
->cno
>= tp
->len
) {
896 TBINC(sp
, tp
->lb
, tp
->lb_len
, tp
->len
+ 1);
897 LF_SET(TXT_APPENDEOL
);
898 tp
->lb
[sp
->cno
] = CURSOR_CH
;
903 if (hex
== H_NEXTCHAR
)
905 if (quoted
== Q_NEXTCHAR
)
909 #if defined(DEBUG) && 1
910 if (sp
->cno
+ tp
->insert
+ tp
->owrite
!= tp
->len
)
912 "len %u != cno: %u ai: %u insert %u overwrite %u",
913 tp
->len
, sp
->cno
, tp
->ai
, tp
->insert
, tp
->owrite
);
914 tp
->len
= sp
->cno
+ tp
->insert
+ tp
->owrite
;
918 /* Clear input flag. */
919 ret
: F_CLR(sp
, S_INPUT
);
921 if (LF_ISSET(TXT_RECORD
))
922 VIP(sp
)->rep_cnt
= rcol
;
927 txt_err(sp
, ep
, tiqh
);
933 * Handle abbreviations.
936 txt_abbrev(sp
, tp
, didsubp
, pushc
)
947 /* Find the beginning of this "word". */
948 for (off
= sp
->cno
- 1, p
= tp
->lb
+ off
, len
= 0;; --p
, --off
) {
954 if (off
== tp
->ai
|| off
== tp
->offset
)
958 /* Check for any abbreviations. */
959 if ((qp
= seq_find(sp
, NULL
, p
, len
, SEQ_ABBREV
, NULL
)) == NULL
) {
965 * Push the abbreviation onto the tty stack. Historically, characters
966 * resulting from an abbreviation expansion were themselves subject to
967 * map expansions, O_SHOWMATCH matching etc. This means the expanded
968 * characters will be re-tested for abbreviations. It's difficult to
969 * know what historic practice in this case was, since abbreviations
970 * were applied to :colon command lines, so entering abbreviations that
971 * looped was tricky, although possible. In addition, obvious loops
972 * didn't work as expected. (The command ':ab a b|ab b c|ab c a' will
973 * silently only implement and/or display the last abbreviation.)
975 * This implementation doesn't recover well from such abbreviations.
976 * The main input loop counts abbreviated characters, and, when it
977 * reaches a limit, discards any abbreviated characters on the queue.
978 * It's difficult to back up to the original position, as the replay
979 * queue would have to be adjusted, and the line state when an initial
980 * abbreviated character was received would have to be saved.
983 if (term_push(sp
, &ch
, 1, 0, CH_ABBREVIATED
))
985 if (term_push(sp
, qp
->output
, qp
->olen
, 0, CH_ABBREVIATED
))
989 * Move the cursor to the start of the abbreviation,
995 /* Copy any insert characters back. */
997 memmove(tp
->lb
+ sp
->cno
+ tp
->owrite
,
998 tp
->lb
+ sp
->cno
+ tp
->owrite
+ len
, tp
->insert
);
1001 * We return the length of the abbreviated characters. This is so
1002 * the calling routine can replace the replay characters with the
1003 * abbreviation. This means that subsequent '.' commands will produce
1004 * the same text, regardless of intervening :[un]abbreviate commands.
1005 * This is historic practice.
1011 /* Offset to next column of stop size. */
1012 #define STOP_OFF(c, stop) (stop - (c) % stop)
1016 * When a line is resolved by <esc> or <cr>, review autoindent
1020 txt_ai_resolve(sp
, tp
)
1026 size_t cno
, len
, new, old
, scno
, spaces
, tab_after_sp
, tabs
;
1030 * If the line is empty, has an offset, or no autoindent
1031 * characters, we're done.
1033 if (!tp
->len
|| tp
->offset
|| !tp
->ai
)
1037 * The autoindent characters plus any leading <blank> characters
1038 * in the line are resolved into the minimum number of characters.
1039 * Historic practice.
1041 ts
= O_VAL(sp
, O_TABSTOP
);
1043 /* Figure out the last <blank> screen column. */
1044 for (p
= tp
->lb
, scno
= 0, len
= tp
->len
,
1045 spaces
= tab_after_sp
= 0; len
-- && isblank(*p
); ++p
)
1049 scno
+= STOP_OFF(scno
, ts
);
1056 * If there are no spaces, or no tabs after spaces and less than
1057 * ts spaces, it's already minimal.
1059 if (!spaces
|| !tab_after_sp
&& spaces
< ts
)
1062 /* Count up spaces/tabs needed to get to the target. */
1063 for (cno
= 0, tabs
= 0; cno
+ STOP_OFF(cno
, ts
) <= scno
; ++tabs
)
1064 cno
+= STOP_OFF(cno
, ts
);
1065 spaces
= scno
- cno
;
1068 * Figure out how many characters we're dropping -- if we're not
1069 * dropping any, it's already minimal, we're done.
1072 new = spaces
+ tabs
;
1076 /* Shift the rest of the characters down, adjust the counts. */
1078 memmove(p
- del
, p
, tp
->len
- old
);
1082 /* Fill in space/tab characters. */
1083 for (p
= tp
->lb
; tabs
--;)
1091 * Handle autoindent. If aitp isn't NULL, use it, otherwise,
1092 * retrieve the line.
1095 txt_auto(sp
, ep
, lno
, aitp
, len
, tp
)
1106 if ((p
= t
= file_gline(sp
, ep
, lno
, &len
)) == NULL
)
1110 for (nlen
= 0; len
; ++p
) {
1113 /* If last character is a space, it counts. */
1120 /* No indentation. */
1127 /* Make sure the buffer's big enough. */
1128 BINC_RET(sp
, tp
->lb
, tp
->lb_len
, tp
->len
+ nlen
);
1130 /* Copy the indentation into the new buffer. */
1131 memmove(tp
->lb
+ nlen
, tp
->lb
, tp
->len
);
1132 memmove(tp
->lb
, t
, nlen
);
1135 /* Return the additional length. */
1142 * Back up to the previously edited line.
1145 txt_backup(sp
, ep
, tiqh
, tp
, flags
)
1155 if (tp
->q
.cqe_prev
== (void *)tiqh
) {
1156 msgq(sp
, M_BERR
, "Already at the beginning of the insert");
1160 /* Update the old line on the screen. */
1161 if (sp
->s_change(sp
, ep
, tp
->lno
, LINE_DELETE
))
1164 /* Get a handle on the previous TEXT structure. */
1165 ntp
= tp
->q
.cqe_prev
;
1167 /* Make sure that we can get enough space. */
1168 if (LF_ISSET(TXT_APPENDEOL
) && ntp
->len
+ 1 > ntp
->lb_len
&&
1169 binc(sp
, &ntp
->lb
, &ntp
->lb_len
, ntp
->len
+ 1))
1173 * Release current TEXT; now committed to the swap, nothing
1176 CIRCLEQ_REMOVE(tiqh
, tp
, q
);
1182 /* Set bookkeeping information. */
1184 if (LF_ISSET(TXT_APPENDEOL
)) {
1185 tp
->lb
[col
] = CURSOR_CH
;
1196 * Handle an error during input processing.
1199 txt_err(sp
, ep
, tiqh
)
1208 * The problem with input processing is that the cursor is at an
1209 * indeterminate position since some input may have been lost due
1210 * to a malloc error. So, try to go back to the place from which
1211 * the cursor started, knowing that it may no longer be available.
1213 * We depend on at least one line number being set in the text
1216 for (lno
= tiqh
->cqh_first
->lno
;
1217 file_gline(sp
, ep
, lno
, &len
) == NULL
&& lno
> 0; --lno
);
1219 sp
->lno
= lno
== 0 ? 1 : lno
;
1222 /* Redraw the screen, just in case. */
1223 F_SET(sp
, S_REDRAW
);
1228 * Let the user insert any character value they want.
1231 * This is an extension. The pattern "^Vx[0-9a-fA-F]*" is a way
1232 * for the user to specify a character value which their keyboard
1233 * may not be able to enter.
1236 txt_hex(sp
, tp
, was_hex
, pushc
)
1248 * Null-terminate the string. Since nul isn't a legal hex value,
1249 * this should be okay, and lets us use a local routine, which
1250 * presumably understands the character set, to convert the value.
1252 savec
= tp
->lb
[sp
->cno
];
1253 tp
->lb
[sp
->cno
] = 0;
1255 /* Find the previous HEX_CH. */
1256 for (off
= sp
->cno
- 1, p
= tp
->lb
+ off
, len
= 0;; --p
, --off
) {
1262 /* If not on this line, there's nothing to do. */
1263 if (off
== tp
->ai
|| off
== tp
->offset
)
1267 /* If no length, then it wasn't a hex value. */
1271 /* Get the value. */
1272 value
= strtol(wp
, NULL
, 16);
1273 if (value
== LONG_MIN
|| value
== LONG_MAX
|| value
> MAX_CHAR_T
) {
1274 nothex
: tp
->lb
[sp
->cno
] = savec
;
1280 if (term_push(sp
, &ch
, 1, 0, CH_NOMAP
| CH_QUOTED
))
1283 if (term_push(sp
, &ch
, 1, 0, CH_NOMAP
| CH_QUOTED
))
1286 tp
->lb
[sp
->cno
] = savec
;
1288 /* Move the cursor to the start of the hex value, adjust the length. */
1292 /* Copy any insert characters back. */
1294 memmove(tp
->lb
+ sp
->cno
+ tp
->owrite
,
1295 tp
->lb
+ sp
->cno
+ tp
->owrite
+ len
+ 1, tp
->insert
);
1302 * Txt_indent and txt_outdent are truly strange. ^T and ^D do movements
1303 * to the next or previous shiftwidth value, i.e. for a 1-based numbering,
1304 * with shiftwidth=3, ^T moves a cursor on the 7th, 8th or 9th column to
1305 * the 10th column, and ^D moves it back.
1308 * The ^T and ^D characters in historical vi only had special meaning when
1309 * they were the first characters typed after entering text input mode.
1310 * Since normal erase characters couldn't erase autoindent (in this case
1311 * ^T) characters, this meant that inserting text into previously existing
1312 * text was quite strange, ^T only worked if it was the first keystroke,
1313 * and then it could only be erased by using ^D. This implementation treats
1314 * ^T specially anywhere it occurs in the input, and permits the standard
1315 * erase characters to erase characters inserted using it.
1318 * Technically, txt_indent, txt_outdent should part of the screen interface,
1319 * as they require knowledge of the size of a space character on the screen.
1320 * (Not the size of tabs, because tabs are logically composed of spaces.)
1321 * They're left in the text code because they're complicated, not to mention
1322 * the gruesome awareness that if spaces aren't a single column on the screen
1323 * for any language, we're into some serious, ah, for lack of a better word,
1329 * Handle ^T indents.
1337 size_t cno
, off
, scno
, spaces
, tabs
;
1339 ts
= O_VAL(sp
, O_TABSTOP
);
1340 sw
= O_VAL(sp
, O_SHIFTWIDTH
);
1342 /* Get the current screen column. */
1343 for (off
= scno
= 0; off
< sp
->cno
; ++off
)
1344 if (tp
->lb
[off
] == '\t')
1345 scno
+= STOP_OFF(scno
, ts
);
1349 /* Count up spaces/tabs needed to get to the target. */
1350 for (cno
= scno
, scno
+= STOP_OFF(scno
, sw
), tabs
= 0;
1351 cno
+ STOP_OFF(cno
, ts
) <= scno
; ++tabs
)
1352 cno
+= STOP_OFF(cno
, ts
);
1353 spaces
= scno
- cno
;
1355 /* Put space/tab characters in place of any overwrite characters. */
1356 for (; tp
->owrite
&& tabs
; --tp
->owrite
, --tabs
, ++tp
->ai
)
1357 tp
->lb
[sp
->cno
++] = '\t';
1358 for (; tp
->owrite
&& spaces
; --tp
->owrite
, --spaces
, ++tp
->ai
)
1359 tp
->lb
[sp
->cno
++] = ' ';
1361 if (!tabs
&& !spaces
)
1364 /* Make sure there's enough room. */
1365 BINC_RET(sp
, tp
->lb
, tp
->lb_len
, tp
->len
+ spaces
+ tabs
);
1367 /* Move the insert characters out of the way. */
1369 memmove(tp
->lb
+ sp
->cno
+ spaces
+ tabs
,
1370 tp
->lb
+ sp
->cno
, tp
->insert
);
1372 /* Add new space/tab characters. */
1373 for (; tabs
--; ++tp
->len
, ++tp
->ai
)
1374 tp
->lb
[sp
->cno
++] = '\t';
1375 for (; spaces
--; ++tp
->len
, ++tp
->ai
)
1376 tp
->lb
[sp
->cno
++] = ' ';
1382 * Handle ^D outdents.
1391 size_t cno
, off
, scno
, spaces
;
1393 ts
= O_VAL(sp
, O_TABSTOP
);
1394 sw
= O_VAL(sp
, O_SHIFTWIDTH
);
1396 /* Get the current screen column. */
1397 for (off
= scno
= 0; off
< sp
->cno
; ++off
)
1398 if (tp
->lb
[off
] == '\t')
1399 scno
+= STOP_OFF(scno
, ts
);
1403 /* Get the previous shiftwidth column. */
1404 for (cno
= scno
; --scno
% sw
!= 0;);
1406 /* Decrement characters until less than or equal to that slot. */
1407 for (; cno
> scno
; --sp
->cno
, --tp
->ai
, ++tp
->owrite
)
1408 if (tp
->lb
[--off
] == '\t')
1409 cno
-= STOP_OFF(cno
, ts
);
1413 /* Spaces needed to get to the target. */
1414 spaces
= scno
- cno
;
1416 /* Maybe just a delete. */
1420 /* Make sure there's enough room. */
1421 BINC_RET(sp
, tp
->lb
, tp
->lb_len
, tp
->len
+ spaces
);
1423 /* Use up any overwrite characters. */
1424 for (; tp
->owrite
&& spaces
; --spaces
, ++tp
->ai
, --tp
->owrite
)
1425 tp
->lb
[sp
->cno
++] = ' ';
1427 /* Maybe that was enough. */
1431 /* Move the insert characters out of the way. */
1433 memmove(tp
->lb
+ sp
->cno
+ spaces
,
1434 tp
->lb
+ sp
->cno
, tp
->insert
);
1436 /* Add new space characters. */
1437 for (; spaces
--; ++tp
->len
, ++tp
->ai
)
1438 tp
->lb
[sp
->cno
++] = ' ';
1444 * Resolve the input text chain into the file.
1447 txt_resolve(sp
, ep
, tiqh
)
1455 /* The first line replaces a current line. */
1456 tp
= tiqh
->cqh_first
;
1457 if (file_sline(sp
, ep
, tp
->lno
, tp
->lb
, tp
->len
))
1460 /* All subsequent lines are appended into the file. */
1461 for (lno
= tp
->lno
; (tp
= tp
->q
.cqe_next
) != (void *)&sp
->tiq
; ++lno
)
1462 if (file_aline(sp
, ep
, 0, lno
, tp
->lb
, tp
->len
))
1469 * Show a character match.
1472 * Historic vi tried to display matches even in the :colon command line.
1476 txt_showmatch(sp
, ep
)
1480 struct timeval second
;
1484 int cnt
, endc
, startc
;
1487 * Do a refresh first, in case the v_ntext() code hasn't done
1488 * one in awhile, so the user can see what we're complaining
1491 if (sp
->s_refresh(sp
, ep
))
1494 * We don't display the match if it's not on the screen. Find
1495 * out what the first character on the screen is.
1497 if (sp
->s_position(sp
, ep
, &m
, 0, P_TOP
))
1500 /* Initialize the getc() interface. */
1501 cs
.cs_lno
= sp
->lno
;
1502 cs
.cs_cno
= sp
->cno
- 1;
1503 if (cs_init(sp
, ep
, &cs
))
1505 startc
= (endc
= cs
.cs_ch
) == ')' ? '(' : '{';
1507 /* Search for the match. */
1509 if (cs_prev(sp
, ep
, &cs
))
1511 if (cs
.cs_lno
< m
.lno
||
1512 cs
.cs_lno
== m
.lno
&& cs
.cs_cno
< m
.cno
)
1514 if (cs
.cs_flags
!= 0) {
1515 if (cs
.cs_flags
== CS_EOF
|| cs
.cs_flags
== CS_SOF
) {
1516 (void)sp
->s_bell(sp
);
1521 if (cs
.cs_ch
== endc
)
1523 else if (cs
.cs_ch
== startc
&& --cnt
== 0)
1527 /* Move to the match. */
1530 sp
->lno
= cs
.cs_lno
;
1531 sp
->cno
= cs
.cs_cno
;
1532 (void)sp
->s_refresh(sp
, ep
);
1535 * Sleep(3) is eight system calls. Do it fast -- besides,
1536 * I don't want to wait an entire second.
1539 second
.tv_sec
= O_VAL(sp
, O_MATCHTIME
) / 10;
1540 second
.tv_usec
= (O_VAL(sp
, O_MATCHTIME
) % 10) * 100000L;
1541 (void)select(0, &zero
, &zero
, &zero
, &second
);
1543 /* Return to the current location. */
1546 (void)sp
->s_refresh(sp
, ep
);
1551 * Handle margin wrap.
1554 * Historic vi belled the user each time a character was entered after
1555 * crossing the margin until a space was entered which could be used to
1556 * break the line. I don't, it tends to wake the cats.
1559 txt_margin(sp
, tp
, didbreak
, pushc
)
1566 size_t len
, off
, tlen
;
1569 /* Find the closest previous blank. */
1570 for (off
= sp
->cno
- 1, p
= tp
->lb
+ off
, len
= 0;; --p
, --off
) {
1576 /* If it's the beginning of the line, there's nothing to do. */
1577 if (off
== tp
->ai
|| off
== tp
->offset
) {
1584 * Historic practice is to delete any trailing whitespace
1585 * from the previous line.
1587 for (tlen
= len
;; --p
, --off
) {
1591 if (off
== tp
->ai
|| off
== tp
->offset
)
1596 if (term_push(sp
, &ch
, 1, 0, CH_NOMAP
| CH_QUOTED
))
1598 if (len
&& term_push(sp
, wp
, len
, 0, CH_NOMAP
| CH_QUOTED
))
1601 if (term_push(sp
, &ch
, 1, 0, CH_NOMAP
))