1 /* $OpenBSD: line.c,v 1.50 2011/01/18 16:28:00 kjell Exp $ */
3 /* This file is in the public domain. */
8 * The functions in this file are a general set of line management
9 * utilities. They are the only routines that touch the text. They
10 * also touch the buffer and window structures to make sure that the
11 * necessary updating gets done. There are routines in this file that
12 * handle the kill buffer too. It isn't here for any good reason.
14 * Note that this code only updates the dot and mark values in the window
15 * list. Since all the code acts on the current window, the buffer that
16 * we are editing must be displayed, which means that "b_nwnd" is non-zero,
17 * which means that the dot and mark values in the buffer headers are
27 * Allocate a new line of size `used'. lrealloc() can be called if the line
28 * ever needs to grow beyond that.
35 if ((lp = malloc(sizeof(*lp))) == NULL)
39 lp->l_used = used; /* XXX */
40 if (lrealloc(lp, used) == FALSE) {
48 lrealloc(struct line *lp, int newsize)
52 if (lp->l_size < newsize) {
53 if ((tmp = realloc(lp->l_text, newsize)) == NULL)
62 * Delete line "lp". Fix all of the links that might point to it (they are
63 * moved to offset 0 of the next line. Unlink the line from whatever buffer
64 * it might be in, and release the memory. The buffers are updated too; the
65 * magic conditions described in the above comments don't hold here.
68 lfree(struct line *lp)
73 for (wp = wheadp; wp != NULL; wp = wp->w_wndp) {
74 if (wp->w_linep == lp)
75 wp->w_linep = lp->l_fp;
76 if (wp->w_dotp == lp) {
77 wp->w_dotp = lp->l_fp;
80 if (wp->w_markp == lp) {
81 wp->w_markp = lp->l_fp;
85 for (bp = bheadp; bp != NULL; bp = bp->b_bufp) {
86 if (bp->b_nwnd == 0) {
87 if (bp->b_dotp == lp) {
88 bp->b_dotp = lp->l_fp;
91 if (bp->b_markp == lp) {
92 bp->b_markp = lp->l_fp;
97 lp->l_bp->l_fp = lp->l_fp;
98 lp->l_fp->l_bp = lp->l_bp;
99 if (lp->l_text != NULL)
105 * This routine is called when a character changes in place in the current
106 * buffer. It updates all of the required flags in the buffer and window
107 * system. The flag used is passed as an argument; if the buffer is being
108 * displayed in more than 1 window we change EDIT to HARD. Set MODE if the
109 * mode line needs to be updated (the "*" has to be set).
116 /* update mode lines if this is the first change. */
117 if ((curbp->b_flag & BFCHG) == 0) {
119 curbp->b_flag |= BFCHG;
121 for (wp = wheadp; wp != NULL; wp = wp->w_wndp) {
122 if (wp->w_bufp == curbp) {
125 wp->w_rflag |= WFFULL;
131 * Insert "n" bytes from "s" at the current location of dot.
132 * In the easy case all that happens is the text is stored in the line.
133 * In the hard case, the line has to be reallocated. When the window list
134 * is updated, take special care; I screwed it up once. You always update
135 * dot in the current window. You update mark and a dot in another window
136 * if it is greater than the place where you did the insert. Return TRUE
137 * if all is well, and FALSE on errors.
140 linsert_str(const char *s, int n)
147 if ((k = checkdirty(curbp)) != TRUE)
150 if (curbp->b_flag & BFREADONLY) {
151 ewprintf("Buffer is read only");
163 /* special case for the end */
164 if (lp1 == curbp->b_headp) {
165 struct line *lp2, *lp3;
167 /* now should only happen in empty buffer */
168 if (curwp->w_doto != 0)
169 panic("bug: linsert_str");
170 /* allocate a new line */
171 if ((lp2 = lalloc(n)) == NULL)
180 for (i = 0; i < n; ++i)
181 lp2->l_text[i] = s[i];
182 for (wp = wheadp; wp != NULL; wp = wp->w_wndp) {
183 if (wp->w_linep == lp1)
185 if (wp->w_dotp == lp1)
187 if (wp->w_markp == lp1)
190 undo_add_insert(lp2, 0, n);
195 doto = curwp->w_doto;
197 if ((lp1->l_used + n) > lp1->l_size) {
198 if (lrealloc(lp1, lp1->l_used + n) == FALSE)
202 if (lp1->l_used != n)
203 memmove(&lp1->l_text[doto + n], &lp1->l_text[doto],
204 lp1->l_used - n - doto);
206 /* Add the characters */
207 for (i = 0; i < n; ++i)
208 lp1->l_text[doto + i] = s[i];
209 for (wp = wheadp; wp != NULL; wp = wp->w_wndp) {
210 if (wp->w_dotp == lp1) {
211 if (wp == curwp || wp->w_doto > doto)
214 if (wp->w_markp == lp1) {
215 if (wp->w_marko > doto)
219 undo_add_insert(curwp->w_dotp, doto, n);
224 * Insert "n" copies of the character "c" at the current location of dot.
225 * In the easy case all that happens is the text is stored in the line.
226 * In the hard case, the line has to be reallocated. When the window list
227 * is updated, take special care; I screwed it up once. You always update
228 * dot in the current window. You update mark and a dot in another window
229 * if it is greater than the place where you did the insert. Return TRUE
230 * if all is well, and FALSE on errors.
233 linsert(int n, int c)
244 if ((s = checkdirty(curbp)) != TRUE)
247 if (curbp->b_flag & BFREADONLY) {
248 ewprintf("Buffer is read only");
257 /* special case for the end */
258 if (lp1 == curbp->b_headp) {
259 struct line *lp2, *lp3;
261 /* now should only happen in empty buffer */
262 if (curwp->w_doto != 0) {
263 ewprintf("bug: linsert");
266 /* allocate a new line */
267 if ((lp2 = lalloc(n)) == NULL)
276 for (i = 0; i < n; ++i)
278 for (wp = wheadp; wp != NULL; wp = wp->w_wndp) {
279 if (wp->w_linep == lp1)
281 if (wp->w_dotp == lp1)
283 if (wp->w_markp == lp1)
286 undo_add_insert(lp2, 0, n);
291 doto = curwp->w_doto;
293 if ((lp1->l_used + n) > lp1->l_size) {
294 if (lrealloc(lp1, lp1->l_used + n) == FALSE)
298 if (lp1->l_used != n)
299 memmove(&lp1->l_text[doto + n], &lp1->l_text[doto],
300 lp1->l_used - n - doto);
302 /* Add the characters */
303 for (i = 0; i < n; ++i)
304 lp1->l_text[doto + i] = c;
305 for (wp = wheadp; wp != NULL; wp = wp->w_wndp) {
306 if (wp->w_dotp == lp1) {
307 if (wp == curwp || wp->w_doto > doto)
310 if (wp->w_markp == lp1) {
311 if (wp->w_marko > doto)
315 undo_add_insert(curwp->w_dotp, doto, n);
320 * Do the work of inserting a newline at the given line/offset.
321 * If mark is on the current line, we may have to move the markline
322 * to keep line numbers in sync.
323 * lnewline_at assumes the current buffer is writable. Checking for
324 * this fact should be done by the caller.
327 lnewline_at(struct line *lp1, int doto)
335 curwp->w_bufp->b_lines++;
336 /* Check if mark is past dot (even on current line) */
337 if (curwp->w_markline > curwp->w_dotline ||
338 (curwp->w_dotline == curwp->w_markline &&
339 curwp->w_marko >= doto))
343 /* If start of line, allocate a new line instead of copying */
346 if ((lp2 = lalloc(0)) == NULL)
348 lp2->l_bp = lp1->l_bp;
349 lp1->l_bp->l_fp = lp2;
352 for (wp = wheadp; wp != NULL; wp = wp->w_wndp)
353 if (wp->w_linep == lp1)
355 undo_add_boundary(FFRAND, 1);
356 undo_add_insert(lp2, 0, 1);
357 undo_add_boundary(FFRAND, 1);
361 /* length of new part */
362 nlen = llength(lp1) - doto;
364 /* new second half line */
365 if ((lp2 = lalloc(nlen)) == NULL)
368 bcopy(&lp1->l_text[doto], &lp2->l_text[0], nlen);
371 lp2->l_fp = lp1->l_fp;
373 lp2->l_fp->l_bp = lp2;
375 for (wp = wheadp; wp != NULL; wp = wp->w_wndp) {
376 if (wp->w_dotp == lp1 && wp->w_doto >= doto) {
380 if (wp->w_markp == lp1 && wp->w_marko >= doto) {
385 undo_add_boundary(FFRAND, 1);
386 undo_add_insert(lp1, llength(lp1), 1);
387 undo_add_boundary(FFRAND, 1);
392 * Insert a newline into the buffer at the current location of dot in the
400 if ((s = checkdirty(curbp)) != TRUE)
402 if (curbp->b_flag & BFREADONLY) {
403 ewprintf("Buffer is read only");
406 return (lnewline_at(curwp->w_dotp, curwp->w_doto));
410 * This function deletes "n" bytes, starting at dot. (actually, n+1, as the
411 * newline is included) It understands how to deal with end of lines, etc.
412 * It returns TRUE if all of the characters were deleted, and FALSE if
413 * they were not (because dot ran into the end of the buffer).
414 * The "kflag" indicates either no insertion, or direction of insertion
415 * into the kill buffer.
418 ldelete(RSIZE n, int kflag)
431 if ((s = checkdirty(curbp)) != TRUE)
433 if (curbp->b_flag & BFREADONLY) {
434 ewprintf("Buffer is read only");
438 if ((sv = calloc(1, len + 1)) == NULL)
442 undo_add_delete(curwp->w_dotp, curwp->w_doto, n, (kflag & KREG));
445 dotp = curwp->w_dotp;
446 doto = curwp->w_doto;
447 /* Hit the end of the buffer */
448 if (dotp == curbp->b_headp)
450 /* Size of the chunk */
451 chunk = dotp->l_used - doto;
455 /* End of line, merge */
457 if (dotp == blastlp(curbp))
460 if (ldelnewline() == FALSE)
462 end = strlcat(sv, "\n", len + 1);
468 cp1 = &dotp->l_text[doto];
469 memcpy(&sv[end], cp1, chunk);
472 for (cp2 = cp1 + chunk; cp2 < &dotp->l_text[dotp->l_used];
475 dotp->l_used -= (int)chunk;
476 for (wp = wheadp; wp != NULL; wp = wp->w_wndp) {
477 if (wp->w_dotp == dotp && wp->w_doto >= doto) {
480 if (wp->w_doto < doto)
483 if (wp->w_markp == dotp && wp->w_marko >= doto) {
485 wp->w_marko -= chunk;
486 if (wp->w_marko < doto)
492 if (kchunk(sv, (RSIZE)len, kflag) != TRUE)
501 * Delete a newline and join the current line with the next line. If the next
502 * line is the magic header line always return TRUE; merging the last line
503 * with the header line can be thought of as always being a successful
504 * operation. Even if nothing is done, this makes the kill buffer work
505 * "right". If the mark is past the dot (actually, markline > dotline),
506 * decrease the markline accordingly to keep line numbers in sync.
507 * Easy cases can be done by shuffling data around. Hard cases
508 * require that lines be moved about in memory. Return FALSE on error and
509 * TRUE if all looks ok. We do not update w_dotline here, as deletes are done
515 struct line *lp1, *lp2, *lp3;
519 if ((s = checkdirty(curbp)) != TRUE)
521 if (curbp->b_flag & BFREADONLY) {
522 ewprintf("Buffer is read only");
528 /* at the end of the buffer */
529 if (lp2 == curbp->b_headp)
531 /* Keep line counts in sync */
532 curwp->w_bufp->b_lines--;
533 if (curwp->w_markline > curwp->w_dotline)
535 if (lp2->l_used <= lp1->l_size - lp1->l_used) {
536 bcopy(&lp2->l_text[0], &lp1->l_text[lp1->l_used], lp2->l_used);
537 for (wp = wheadp; wp != NULL; wp = wp->w_wndp) {
538 if (wp->w_linep == lp2)
540 if (wp->w_dotp == lp2) {
542 wp->w_doto += lp1->l_used;
544 if (wp->w_markp == lp2) {
546 wp->w_marko += lp1->l_used;
549 lp1->l_used += lp2->l_used;
550 lp1->l_fp = lp2->l_fp;
551 lp2->l_fp->l_bp = lp1;
555 if ((lp3 = lalloc(lp1->l_used + lp2->l_used)) == NULL)
557 bcopy(&lp1->l_text[0], &lp3->l_text[0], lp1->l_used);
558 bcopy(&lp2->l_text[0], &lp3->l_text[lp1->l_used], lp2->l_used);
559 lp1->l_bp->l_fp = lp3;
560 lp3->l_fp = lp2->l_fp;
561 lp2->l_fp->l_bp = lp3;
562 lp3->l_bp = lp1->l_bp;
563 for (wp = wheadp; wp != NULL; wp = wp->w_wndp) {
564 if (wp->w_linep == lp1 || wp->w_linep == lp2)
566 if (wp->w_dotp == lp1)
568 else if (wp->w_dotp == lp2) {
570 wp->w_doto += lp1->l_used;
572 if (wp->w_markp == lp1)
574 else if (wp->w_markp == lp2) {
576 wp->w_marko += lp1->l_used;
585 * Replace plen characters before dot with argument string. Control-J
586 * characters in st are interpreted as newlines. There is a casehack
587 * disable flag (normally it likes to match case of replacement to what
591 lreplace(RSIZE plen, char *st)
593 RSIZE rlen; /* replacement length */
596 if ((s = checkdirty(curbp)) != TRUE)
598 if (curbp->b_flag & BFREADONLY) {
599 ewprintf("Buffer is read only");
602 undo_boundary_enable(FFRAND, 0);
604 (void)backchar(FFARG | FFRAND, (int)plen);
605 (void)ldelete(plen, KNONE);
608 region_put_data(st, rlen);
611 undo_boundary_enable(FFRAND, 1);
616 * Allocate and return the supplied line as a C string
619 linetostr(const struct line *ln)
625 if (len == INT_MAX) /* (len + 1) overflow */
628 if ((line = malloc(len + 1)) == NULL)
631 (void)memcpy(line, ltext(ln), len);