--- /dev/null
+/* $OpenBSD: line.c,v 1.50 2011/01/18 16:28:00 kjell Exp $ */
+
+/* This file is in the public domain. */
+
+/*
+ * Text line handling.
+ *
+ * The functions in this file are a general set of line management
+ * utilities. They are the only routines that touch the text. They
+ * also touch the buffer and window structures to make sure that the
+ * necessary updating gets done. There are routines in this file that
+ * handle the kill buffer too. It isn't here for any good reason.
+ *
+ * Note that this code only updates the dot and mark values in the window
+ * list. Since all the code acts on the current window, the buffer that
+ * we are editing must be displayed, which means that "b_nwnd" is non-zero,
+ * which means that the dot and mark values in the buffer headers are
+ * nonsense.
+ */
+
+#include "def.h"
+
+#include <stdlib.h>
+#include <string.h>
+
+/*
+ * Allocate a new line of size `used'. lrealloc() can be called if the line
+ * ever needs to grow beyond that.
+ */
+struct line *
+lalloc(int used)
+{
+ struct line *lp;
+
+ if ((lp = malloc(sizeof(*lp))) == NULL)
+ return (NULL);
+ lp->l_text = NULL;
+ lp->l_size = 0;
+ lp->l_used = used; /* XXX */
+ if (lrealloc(lp, used) == FALSE) {
+ free(lp);
+ return (NULL);
+ }
+ return (lp);
+}
+
+int
+lrealloc(struct line *lp, int newsize)
+{
+ char *tmp;
+
+ if (lp->l_size < newsize) {
+ if ((tmp = realloc(lp->l_text, newsize)) == NULL)
+ return (FALSE);
+ lp->l_text = tmp;
+ lp->l_size = newsize;
+ }
+ return (TRUE);
+}
+
+/*
+ * Delete line "lp". Fix all of the links that might point to it (they are
+ * moved to offset 0 of the next line. Unlink the line from whatever buffer
+ * it might be in, and release the memory. The buffers are updated too; the
+ * magic conditions described in the above comments don't hold here.
+ */
+void
+lfree(struct line *lp)
+{
+ struct buffer *bp;
+ struct mgwin *wp;
+
+ for (wp = wheadp; wp != NULL; wp = wp->w_wndp) {
+ if (wp->w_linep == lp)
+ wp->w_linep = lp->l_fp;
+ if (wp->w_dotp == lp) {
+ wp->w_dotp = lp->l_fp;
+ wp->w_doto = 0;
+ }
+ if (wp->w_markp == lp) {
+ wp->w_markp = lp->l_fp;
+ wp->w_marko = 0;
+ }
+ }
+ for (bp = bheadp; bp != NULL; bp = bp->b_bufp) {
+ if (bp->b_nwnd == 0) {
+ if (bp->b_dotp == lp) {
+ bp->b_dotp = lp->l_fp;
+ bp->b_doto = 0;
+ }
+ if (bp->b_markp == lp) {
+ bp->b_markp = lp->l_fp;
+ bp->b_marko = 0;
+ }
+ }
+ }
+ lp->l_bp->l_fp = lp->l_fp;
+ lp->l_fp->l_bp = lp->l_bp;
+ if (lp->l_text != NULL)
+ free(lp->l_text);
+ free(lp);
+}
+
+/*
+ * This routine is called when a character changes in place in the current
+ * buffer. It updates all of the required flags in the buffer and window
+ * system. The flag used is passed as an argument; if the buffer is being
+ * displayed in more than 1 window we change EDIT to HARD. Set MODE if the
+ * mode line needs to be updated (the "*" has to be set).
+ */
+void
+lchange(int flag)
+{
+ struct mgwin *wp;
+
+ /* update mode lines if this is the first change. */
+ if ((curbp->b_flag & BFCHG) == 0) {
+ flag |= WFMODE;
+ curbp->b_flag |= BFCHG;
+ }
+ for (wp = wheadp; wp != NULL; wp = wp->w_wndp) {
+ if (wp->w_bufp == curbp) {
+ wp->w_rflag |= flag;
+ if (wp != curwp)
+ wp->w_rflag |= WFFULL;
+ }
+ }
+}
+
+/*
+ * Insert "n" bytes from "s" at the current location of dot.
+ * In the easy case all that happens is the text is stored in the line.
+ * In the hard case, the line has to be reallocated. When the window list
+ * is updated, take special care; I screwed it up once. You always update
+ * dot in the current window. You update mark and a dot in another window
+ * if it is greater than the place where you did the insert. Return TRUE
+ * if all is well, and FALSE on errors.
+ */
+int
+linsert_str(const char *s, int n)
+{
+ struct line *lp1;
+ struct mgwin *wp;
+ RSIZE i;
+ int doto, k;
+
+ if ((k = checkdirty(curbp)) != TRUE)
+ return (k);
+
+ if (curbp->b_flag & BFREADONLY) {
+ ewprintf("Buffer is read only");
+ return (FALSE);
+ }
+
+ if (!n)
+ return (TRUE);
+
+ lchange(WFFULL);
+
+ /* current line */
+ lp1 = curwp->w_dotp;
+
+ /* special case for the end */
+ if (lp1 == curbp->b_headp) {
+ struct line *lp2, *lp3;
+
+ /* now should only happen in empty buffer */
+ if (curwp->w_doto != 0)
+ panic("bug: linsert_str");
+ /* allocate a new line */
+ if ((lp2 = lalloc(n)) == NULL)
+ return (FALSE);
+ /* previous line */
+ lp3 = lp1->l_bp;
+ /* link in */
+ lp3->l_fp = lp2;
+ lp2->l_fp = lp1;
+ lp1->l_bp = lp2;
+ lp2->l_bp = lp3;
+ for (i = 0; i < n; ++i)
+ lp2->l_text[i] = s[i];
+ for (wp = wheadp; wp != NULL; wp = wp->w_wndp) {
+ if (wp->w_linep == lp1)
+ wp->w_linep = lp2;
+ if (wp->w_dotp == lp1)
+ wp->w_dotp = lp2;
+ if (wp->w_markp == lp1)
+ wp->w_markp = lp2;
+ }
+ undo_add_insert(lp2, 0, n);
+ curwp->w_doto = n;
+ return (TRUE);
+ }
+ /* save for later */
+ doto = curwp->w_doto;
+
+ if ((lp1->l_used + n) > lp1->l_size) {
+ if (lrealloc(lp1, lp1->l_used + n) == FALSE)
+ return (FALSE);
+ }
+ lp1->l_used += n;
+ if (lp1->l_used != n)
+ memmove(&lp1->l_text[doto + n], &lp1->l_text[doto],
+ lp1->l_used - n - doto);
+
+ /* Add the characters */
+ for (i = 0; i < n; ++i)
+ lp1->l_text[doto + i] = s[i];
+ for (wp = wheadp; wp != NULL; wp = wp->w_wndp) {
+ if (wp->w_dotp == lp1) {
+ if (wp == curwp || wp->w_doto > doto)
+ wp->w_doto += n;
+ }
+ if (wp->w_markp == lp1) {
+ if (wp->w_marko > doto)
+ wp->w_marko += n;
+ }
+ }
+ undo_add_insert(curwp->w_dotp, doto, n);
+ return (TRUE);
+}
+
+/*
+ * Insert "n" copies of the character "c" at the current location of dot.
+ * In the easy case all that happens is the text is stored in the line.
+ * In the hard case, the line has to be reallocated. When the window list
+ * is updated, take special care; I screwed it up once. You always update
+ * dot in the current window. You update mark and a dot in another window
+ * if it is greater than the place where you did the insert. Return TRUE
+ * if all is well, and FALSE on errors.
+ */
+int
+linsert(int n, int c)
+{
+ struct line *lp1;
+ struct mgwin *wp;
+ RSIZE i;
+ int doto;
+ int s;
+
+ if (!n)
+ return (TRUE);
+
+ if ((s = checkdirty(curbp)) != TRUE)
+ return (s);
+
+ if (curbp->b_flag & BFREADONLY) {
+ ewprintf("Buffer is read only");
+ return (FALSE);
+ }
+
+ lchange(WFEDIT);
+
+ /* current line */
+ lp1 = curwp->w_dotp;
+
+ /* special case for the end */
+ if (lp1 == curbp->b_headp) {
+ struct line *lp2, *lp3;
+
+ /* now should only happen in empty buffer */
+ if (curwp->w_doto != 0) {
+ ewprintf("bug: linsert");
+ return (FALSE);
+ }
+ /* allocate a new line */
+ if ((lp2 = lalloc(n)) == NULL)
+ return (FALSE);
+ /* previous line */
+ lp3 = lp1->l_bp;
+ /* link in */
+ lp3->l_fp = lp2;
+ lp2->l_fp = lp1;
+ lp1->l_bp = lp2;
+ lp2->l_bp = lp3;
+ for (i = 0; i < n; ++i)
+ lp2->l_text[i] = c;
+ for (wp = wheadp; wp != NULL; wp = wp->w_wndp) {
+ if (wp->w_linep == lp1)
+ wp->w_linep = lp2;
+ if (wp->w_dotp == lp1)
+ wp->w_dotp = lp2;
+ if (wp->w_markp == lp1)
+ wp->w_markp = lp2;
+ }
+ undo_add_insert(lp2, 0, n);
+ curwp->w_doto = n;
+ return (TRUE);
+ }
+ /* save for later */
+ doto = curwp->w_doto;
+
+ if ((lp1->l_used + n) > lp1->l_size) {
+ if (lrealloc(lp1, lp1->l_used + n) == FALSE)
+ return (FALSE);
+ }
+ lp1->l_used += n;
+ if (lp1->l_used != n)
+ memmove(&lp1->l_text[doto + n], &lp1->l_text[doto],
+ lp1->l_used - n - doto);
+
+ /* Add the characters */
+ for (i = 0; i < n; ++i)
+ lp1->l_text[doto + i] = c;
+ for (wp = wheadp; wp != NULL; wp = wp->w_wndp) {
+ if (wp->w_dotp == lp1) {
+ if (wp == curwp || wp->w_doto > doto)
+ wp->w_doto += n;
+ }
+ if (wp->w_markp == lp1) {
+ if (wp->w_marko > doto)
+ wp->w_marko += n;
+ }
+ }
+ undo_add_insert(curwp->w_dotp, doto, n);
+ return (TRUE);
+}
+
+/*
+ * Do the work of inserting a newline at the given line/offset.
+ * If mark is on the current line, we may have to move the markline
+ * to keep line numbers in sync.
+ * lnewline_at assumes the current buffer is writable. Checking for
+ * this fact should be done by the caller.
+ */
+int
+lnewline_at(struct line *lp1, int doto)
+{
+ struct line *lp2;
+ int nlen;
+ struct mgwin *wp;
+
+ lchange(WFFULL);
+
+ curwp->w_bufp->b_lines++;
+ /* Check if mark is past dot (even on current line) */
+ if (curwp->w_markline > curwp->w_dotline ||
+ (curwp->w_dotline == curwp->w_markline &&
+ curwp->w_marko >= doto))
+ curwp->w_markline++;
+ curwp->w_dotline++;
+
+ /* If start of line, allocate a new line instead of copying */
+ if (doto == 0) {
+ /* new first part */
+ if ((lp2 = lalloc(0)) == NULL)
+ return (FALSE);
+ lp2->l_bp = lp1->l_bp;
+ lp1->l_bp->l_fp = lp2;
+ lp2->l_fp = lp1;
+ lp1->l_bp = lp2;
+ for (wp = wheadp; wp != NULL; wp = wp->w_wndp)
+ if (wp->w_linep == lp1)
+ wp->w_linep = lp2;
+ undo_add_boundary(FFRAND, 1);
+ undo_add_insert(lp2, 0, 1);
+ undo_add_boundary(FFRAND, 1);
+ return (TRUE);
+ }
+
+ /* length of new part */
+ nlen = llength(lp1) - doto;
+
+ /* new second half line */
+ if ((lp2 = lalloc(nlen)) == NULL)
+ return (FALSE);
+ if (nlen != 0)
+ bcopy(&lp1->l_text[doto], &lp2->l_text[0], nlen);
+ lp1->l_used = doto;
+ lp2->l_bp = lp1;
+ lp2->l_fp = lp1->l_fp;
+ lp1->l_fp = lp2;
+ lp2->l_fp->l_bp = lp2;
+ /* Windows */
+ for (wp = wheadp; wp != NULL; wp = wp->w_wndp) {
+ if (wp->w_dotp == lp1 && wp->w_doto >= doto) {
+ wp->w_dotp = lp2;
+ wp->w_doto -= doto;
+ }
+ if (wp->w_markp == lp1 && wp->w_marko >= doto) {
+ wp->w_markp = lp2;
+ wp->w_marko -= doto;
+ }
+ }
+ undo_add_boundary(FFRAND, 1);
+ undo_add_insert(lp1, llength(lp1), 1);
+ undo_add_boundary(FFRAND, 1);
+ return (TRUE);
+}
+
+/*
+ * Insert a newline into the buffer at the current location of dot in the
+ * current window.
+ */
+int
+lnewline(void)
+{
+ int s;
+
+ if ((s = checkdirty(curbp)) != TRUE)
+ return (s);
+ if (curbp->b_flag & BFREADONLY) {
+ ewprintf("Buffer is read only");
+ return (FALSE);
+ }
+ return (lnewline_at(curwp->w_dotp, curwp->w_doto));
+}
+
+/*
+ * This function deletes "n" bytes, starting at dot. (actually, n+1, as the
+ * newline is included) It understands how to deal with end of lines, etc.
+ * It returns TRUE if all of the characters were deleted, and FALSE if
+ * they were not (because dot ran into the end of the buffer).
+ * The "kflag" indicates either no insertion, or direction of insertion
+ * into the kill buffer.
+ */
+int
+ldelete(RSIZE n, int kflag)
+{
+ struct line *dotp;
+ RSIZE chunk;
+ struct mgwin *wp;
+ int doto;
+ char *cp1, *cp2;
+ size_t len;
+ char *sv = NULL;
+ int end;
+ int s;
+ int rval = FALSE;
+
+ if ((s = checkdirty(curbp)) != TRUE)
+ return (s);
+ if (curbp->b_flag & BFREADONLY) {
+ ewprintf("Buffer is read only");
+ goto out;
+ }
+ len = n;
+ if ((sv = calloc(1, len + 1)) == NULL)
+ goto out;
+ end = 0;
+
+ undo_add_delete(curwp->w_dotp, curwp->w_doto, n, (kflag & KREG));
+
+ while (n != 0) {
+ dotp = curwp->w_dotp;
+ doto = curwp->w_doto;
+ /* Hit the end of the buffer */
+ if (dotp == curbp->b_headp)
+ goto out;
+ /* Size of the chunk */
+ chunk = dotp->l_used - doto;
+
+ if (chunk > n)
+ chunk = n;
+ /* End of line, merge */
+ if (chunk == 0) {
+ if (dotp == blastlp(curbp))
+ goto out;
+ lchange(WFFULL);
+ if (ldelnewline() == FALSE)
+ goto out;
+ end = strlcat(sv, "\n", len + 1);
+ --n;
+ continue;
+ }
+ lchange(WFEDIT);
+ /* Scrunch text */
+ cp1 = &dotp->l_text[doto];
+ memcpy(&sv[end], cp1, chunk);
+ end += chunk;
+ sv[end] = '\0';
+ for (cp2 = cp1 + chunk; cp2 < &dotp->l_text[dotp->l_used];
+ cp2++)
+ *cp1++ = *cp2;
+ dotp->l_used -= (int)chunk;
+ for (wp = wheadp; wp != NULL; wp = wp->w_wndp) {
+ if (wp->w_dotp == dotp && wp->w_doto >= doto) {
+ /* NOSTRICT */
+ wp->w_doto -= chunk;
+ if (wp->w_doto < doto)
+ wp->w_doto = doto;
+ }
+ if (wp->w_markp == dotp && wp->w_marko >= doto) {
+ /* NOSTRICT */
+ wp->w_marko -= chunk;
+ if (wp->w_marko < doto)
+ wp->w_marko = doto;
+ }
+ }
+ n -= chunk;
+ }
+ if (kchunk(sv, (RSIZE)len, kflag) != TRUE)
+ goto out;
+ rval = TRUE;
+out:
+ free(sv);
+ return (rval);
+}
+
+/*
+ * Delete a newline and join the current line with the next line. If the next
+ * line is the magic header line always return TRUE; merging the last line
+ * with the header line can be thought of as always being a successful
+ * operation. Even if nothing is done, this makes the kill buffer work
+ * "right". If the mark is past the dot (actually, markline > dotline),
+ * decrease the markline accordingly to keep line numbers in sync.
+ * Easy cases can be done by shuffling data around. Hard cases
+ * require that lines be moved about in memory. Return FALSE on error and
+ * TRUE if all looks ok. We do not update w_dotline here, as deletes are done
+ * after moves.
+ */
+int
+ldelnewline(void)
+{
+ struct line *lp1, *lp2, *lp3;
+ struct mgwin *wp;
+ int s;
+
+ if ((s = checkdirty(curbp)) != TRUE)
+ return (s);
+ if (curbp->b_flag & BFREADONLY) {
+ ewprintf("Buffer is read only");
+ return (FALSE);
+ }
+
+ lp1 = curwp->w_dotp;
+ lp2 = lp1->l_fp;
+ /* at the end of the buffer */
+ if (lp2 == curbp->b_headp)
+ return (TRUE);
+ /* Keep line counts in sync */
+ curwp->w_bufp->b_lines--;
+ if (curwp->w_markline > curwp->w_dotline)
+ curwp->w_markline--;
+ if (lp2->l_used <= lp1->l_size - lp1->l_used) {
+ bcopy(&lp2->l_text[0], &lp1->l_text[lp1->l_used], lp2->l_used);
+ for (wp = wheadp; wp != NULL; wp = wp->w_wndp) {
+ if (wp->w_linep == lp2)
+ wp->w_linep = lp1;
+ if (wp->w_dotp == lp2) {
+ wp->w_dotp = lp1;
+ wp->w_doto += lp1->l_used;
+ }
+ if (wp->w_markp == lp2) {
+ wp->w_markp = lp1;
+ wp->w_marko += lp1->l_used;
+ }
+ }
+ lp1->l_used += lp2->l_used;
+ lp1->l_fp = lp2->l_fp;
+ lp2->l_fp->l_bp = lp1;
+ free(lp2);
+ return (TRUE);
+ }
+ if ((lp3 = lalloc(lp1->l_used + lp2->l_used)) == NULL)
+ return (FALSE);
+ bcopy(&lp1->l_text[0], &lp3->l_text[0], lp1->l_used);
+ bcopy(&lp2->l_text[0], &lp3->l_text[lp1->l_used], lp2->l_used);
+ lp1->l_bp->l_fp = lp3;
+ lp3->l_fp = lp2->l_fp;
+ lp2->l_fp->l_bp = lp3;
+ lp3->l_bp = lp1->l_bp;
+ for (wp = wheadp; wp != NULL; wp = wp->w_wndp) {
+ if (wp->w_linep == lp1 || wp->w_linep == lp2)
+ wp->w_linep = lp3;
+ if (wp->w_dotp == lp1)
+ wp->w_dotp = lp3;
+ else if (wp->w_dotp == lp2) {
+ wp->w_dotp = lp3;
+ wp->w_doto += lp1->l_used;
+ }
+ if (wp->w_markp == lp1)
+ wp->w_markp = lp3;
+ else if (wp->w_markp == lp2) {
+ wp->w_markp = lp3;
+ wp->w_marko += lp1->l_used;
+ }
+ }
+ free(lp1);
+ free(lp2);
+ return (TRUE);
+}
+
+/*
+ * Replace plen characters before dot with argument string. Control-J
+ * characters in st are interpreted as newlines. There is a casehack
+ * disable flag (normally it likes to match case of replacement to what
+ * was there).
+ */
+int
+lreplace(RSIZE plen, char *st)
+{
+ RSIZE rlen; /* replacement length */
+ int s;
+
+ if ((s = checkdirty(curbp)) != TRUE)
+ return (s);
+ if (curbp->b_flag & BFREADONLY) {
+ ewprintf("Buffer is read only");
+ return (FALSE);
+ }
+ undo_boundary_enable(FFRAND, 0);
+
+ (void)backchar(FFARG | FFRAND, (int)plen);
+ (void)ldelete(plen, KNONE);
+
+ rlen = strlen(st);
+ region_put_data(st, rlen);
+ lchange(WFFULL);
+
+ undo_boundary_enable(FFRAND, 1);
+ return (TRUE);
+}
+
+/*
+ * Allocate and return the supplied line as a C string
+ */
+char *
+linetostr(const struct line *ln)
+{
+ int len;
+ char *line;
+
+ len = llength(ln);
+ if (len == INT_MAX) /* (len + 1) overflow */
+ return (NULL);
+
+ if ((line = malloc(len + 1)) == NULL)
+ return (NULL);
+
+ (void)memcpy(line, ltext(ln), len);
+ line[len] = '\0';
+
+ return (line);
+}
projects / pd_readline / blobdiff