1217 lines
27 KiB
C
1217 lines
27 KiB
C
/*-
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* Copyright (c) 1993, 1994
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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static char sccsid[] = "@(#)svi_smap.c 8.48 (Berkeley) 8/17/94";
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#endif /* not lint */
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#include <sys/types.h>
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#include <sys/queue.h>
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#include <sys/time.h>
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#include <bitstring.h>
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#include <limits.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <termios.h>
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#include "compat.h"
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#include <curses.h>
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#include <db.h>
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#include <regex.h>
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#include "vi.h"
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#include "../vi/vcmd.h"
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#include "svi_screen.h"
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static int svi_deleteln __P((SCR *, int));
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static int svi_insertln __P((SCR *, int));
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static int svi_sm_delete __P((SCR *, EXF *, recno_t));
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static int svi_sm_down __P((SCR *, EXF *,
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MARK *, recno_t, enum sctype, SMAP *));
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static int svi_sm_erase __P((SCR *));
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static int svi_sm_insert __P((SCR *, EXF *, recno_t));
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static int svi_sm_reset __P((SCR *, EXF *, recno_t));
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static int svi_sm_up __P((SCR *, EXF *,
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MARK *, recno_t, enum sctype, SMAP *));
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/*
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* svi_change --
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* Make a change to the screen.
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*/
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int
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svi_change(sp, ep, lno, op)
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SCR *sp;
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EXF *ep;
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recno_t lno;
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enum operation op;
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{
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SMAP *p;
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size_t oldy, oldx;
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/* Appending is the same as inserting, if the line is incremented. */
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if (op == LINE_APPEND) {
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++lno;
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op = LINE_INSERT;
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}
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/* Ignore the change if the line is after the map. */
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if (lno > TMAP->lno)
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return (0);
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/*
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* If the line is before the map, and it's a decrement, decrement
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* the map. If it's an increment, increment the map. Otherwise,
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* ignore it.
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*/
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if (lno < HMAP->lno) {
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switch (op) {
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case LINE_APPEND:
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abort();
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/* NOTREACHED */
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case LINE_DELETE:
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for (p = HMAP; p <= TMAP; ++p)
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--p->lno;
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if (sp->lno >= lno)
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--sp->lno;
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F_SET(sp, S_RENUMBER);
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break;
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case LINE_INSERT:
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for (p = HMAP; p <= TMAP; ++p)
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++p->lno;
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if (sp->lno >= lno)
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++sp->lno;
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F_SET(sp, S_RENUMBER);
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break;
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case LINE_RESET:
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break;
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}
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return (0);
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}
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F_SET(SVP(sp), SVI_SCREENDIRTY);
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/* Invalidate the cursor, if it's on this line. */
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if (sp->lno == lno)
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F_SET(SVP(sp), SVI_CUR_INVALID);
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/* Invalidate the line size cache. */
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SVI_SCR_CFLUSH(SVP(sp));
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getyx(stdscr, oldy, oldx);
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switch (op) {
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case LINE_DELETE:
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if (svi_sm_delete(sp, ep, lno))
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return (1);
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F_SET(sp, S_RENUMBER);
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break;
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case LINE_INSERT:
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if (svi_sm_insert(sp, ep, lno))
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return (1);
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F_SET(sp, S_RENUMBER);
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break;
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case LINE_RESET:
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if (svi_sm_reset(sp, ep, lno))
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return (1);
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break;
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default:
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abort();
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}
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MOVEA(sp, oldy, oldx);
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return (0);
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}
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/*
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* svi_sm_fill --
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* Fill in the screen map, placing the specified line at the
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* right position. There isn't any way to tell if an SMAP
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* entry has been filled in, so this routine had better be
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* called with P_FILL set before anything else is done.
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*
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* !!!
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* Unexported interface: if lno is OOBLNO, P_TOP means that the HMAP
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* slot is already filled in, P_BOTTOM means that the TMAP slot is
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* already filled in, and we just finish up the job.
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*/
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int
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svi_sm_fill(sp, ep, lno, pos)
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SCR *sp;
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EXF *ep;
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recno_t lno;
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enum position pos;
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{
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SMAP *p, tmp;
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/* Flush all cached information from the SMAP. */
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for (p = HMAP; p <= TMAP; ++p)
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SMAP_FLUSH(p);
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/* If the map is filled, the screen must be redrawn. */
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F_SET(sp, S_REDRAW);
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switch (pos) {
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case P_FILL:
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tmp.lno = 1;
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tmp.off = 1;
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/* See if less than half a screen from the top. */
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if (svi_sm_nlines(sp, ep,
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&tmp, lno, HALFTEXT(sp)) <= HALFTEXT(sp)) {
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lno = 1;
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goto top;
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}
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/* See if less than half a screen from the bottom. */
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if (file_lline(sp, ep, &tmp.lno))
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return (1);
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if (!O_ISSET(sp, O_LEFTRIGHT))
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tmp.off = svi_opt_screens(sp, ep, tmp.lno, NULL);
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if (svi_sm_nlines(sp, ep,
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&tmp, lno, HALFTEXT(sp)) <= HALFTEXT(sp)) {
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TMAP->lno = tmp.lno;
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if (!O_ISSET(sp, O_LEFTRIGHT))
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TMAP->off = tmp.off;
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goto bottom;
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}
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goto middle;
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case P_TOP:
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if (lno != OOBLNO) {
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top: HMAP->lno = lno;
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HMAP->off = 1;
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}
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/* If we fail, just punt. */
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for (p = HMAP; p < TMAP; ++p)
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if (svi_sm_next(sp, ep, p, p + 1))
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goto err;
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break;
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case P_MIDDLE:
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/* If we fail, guess that the file is too small. */
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middle: p = HMAP + (TMAP - HMAP) / 2;
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for (p->lno = lno, p->off = 1; p > HMAP; --p)
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if (svi_sm_prev(sp, ep, p, p - 1)) {
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lno = 1;
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goto top;
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}
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/* If we fail, just punt. */
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p = HMAP + (TMAP - HMAP) / 2;
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for (; p < TMAP; ++p)
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if (svi_sm_next(sp, ep, p, p + 1))
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goto err;
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break;
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case P_BOTTOM:
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if (lno != OOBLNO) {
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TMAP->lno = lno;
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if (!O_ISSET(sp, O_LEFTRIGHT))
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TMAP->off = svi_opt_screens(sp, ep, lno, NULL);
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}
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/* If we fail, guess that the file is too small. */
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bottom: for (p = TMAP; p > HMAP; --p)
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if (svi_sm_prev(sp, ep, p, p - 1)) {
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lno = 1;
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goto top;
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}
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break;
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default:
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abort();
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}
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return (0);
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/*
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* Try and put *something* on the screen. If this fails,
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* we have a serious hard error.
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*/
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err: HMAP->lno = 1;
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HMAP->off = 1;
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for (p = HMAP; p < TMAP; ++p)
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if (svi_sm_next(sp, ep, p, p + 1))
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return (1);
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return (0);
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}
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/*
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* For the routines svi_sm_reset, svi_sm_delete and svi_sm_insert: if the
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* screen only contains one line, or, if the line is the entire screen, this
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* gets fairly exciting. Skip the fun and simply return if there's only one
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* line in the screen, or just call fill. Fill may not be entirely accurate,
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* i.e. we may be painting the screen with something not even close to the
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* cursor, but it's not like we're into serious performance issues here, and
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* the refresh routine will fix it for us.
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*/
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#define TOO_WEIRD { \
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if (cnt_orig >= sp->t_rows) { \
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if (cnt_orig == 1) \
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return (0); \
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if (file_gline(sp, ep, lno, NULL) == NULL) \
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if (file_lline(sp, ep, &lno)) \
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return (1); \
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F_SET(sp, S_REDRAW); \
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return (svi_sm_fill(sp, ep, lno, P_TOP)); \
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} \
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}
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/*
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* svi_sm_delete --
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* Delete a line out of the SMAP.
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*/
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static int
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svi_sm_delete(sp, ep, lno)
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SCR *sp;
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EXF *ep;
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recno_t lno;
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{
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SMAP *p, *t;
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size_t cnt_orig;
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/*
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* Find the line in the map, and count the number of screen lines
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* which display any part of the deleted line.
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*/
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for (p = HMAP; p->lno != lno; ++p);
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if (O_ISSET(sp, O_LEFTRIGHT))
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cnt_orig = 1;
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else
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for (cnt_orig = 1, t = p + 1;
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t <= TMAP && t->lno == lno; ++cnt_orig, ++t);
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TOO_WEIRD;
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/* Delete that many lines from the screen. */
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MOVE(sp, p - HMAP, 0);
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if (svi_deleteln(sp, cnt_orig))
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return (1);
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/* Shift the screen map up. */
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memmove(p, p + cnt_orig, (((TMAP - p) - cnt_orig) + 1) * sizeof(SMAP));
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/* Decrement the line numbers for the rest of the map. */
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for (t = TMAP - cnt_orig; p <= t; ++p)
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--p->lno;
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/* Display the new lines. */
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for (p = TMAP - cnt_orig;;) {
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if (p < TMAP && svi_sm_next(sp, ep, p, p + 1))
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return (1);
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/* svi_sm_next() flushed the cache. */
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if (svi_line(sp, ep, ++p, NULL, NULL))
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return (1);
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if (p == TMAP)
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break;
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}
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return (0);
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}
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/*
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* svi_sm_insert --
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* Insert a line into the SMAP.
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*/
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static int
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svi_sm_insert(sp, ep, lno)
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SCR *sp;
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EXF *ep;
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recno_t lno;
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{
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SMAP *p, *t;
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size_t cnt_orig, cnt;
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/*
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* Find the line in the map, find out how many screen lines
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* needed to display the line.
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*/
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for (p = HMAP; p->lno != lno; ++p);
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if (O_ISSET(sp, O_LEFTRIGHT))
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cnt_orig = 1;
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else
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cnt_orig = svi_opt_screens(sp, ep, lno, NULL);
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TOO_WEIRD;
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/*
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* The lines left in the screen override the number of screen
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* lines in the inserted line.
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*/
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cnt = (TMAP - p) + 1;
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if (cnt_orig > cnt)
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cnt_orig = cnt;
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/* Push down that many lines. */
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MOVE(sp, p - HMAP, 0);
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if (svi_insertln(sp, cnt_orig))
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return (1);
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/* Shift the screen map down. */
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memmove(p + cnt_orig, p, (((TMAP - p) - cnt_orig) + 1) * sizeof(SMAP));
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/* Increment the line numbers for the rest of the map. */
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for (t = p + cnt_orig; t <= TMAP; ++t)
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++t->lno;
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/* Fill in the SMAP for the new lines, and display. */
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for (cnt = 1, t = p; cnt <= cnt_orig; ++t, ++cnt) {
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t->lno = lno;
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t->off = cnt;
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SMAP_FLUSH(t);
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if (svi_line(sp, ep, t, NULL, NULL))
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return (1);
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}
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return (0);
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}
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/*
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* svi_sm_reset --
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* Reset a line in the SMAP.
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*/
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static int
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svi_sm_reset(sp, ep, lno)
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SCR *sp;
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EXF *ep;
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recno_t lno;
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{
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SMAP *p, *t;
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size_t cnt_orig, cnt_new, cnt, diff;
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/*
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* See if the number of on-screen rows taken up by the old display
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* for the line is the same as the number needed for the new one.
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* If so, repaint, otherwise do it the hard way.
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*/
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for (p = HMAP; p->lno != lno; ++p);
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if (O_ISSET(sp, O_LEFTRIGHT)) {
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t = p;
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cnt_orig = cnt_new = 1;
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} else {
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for (cnt_orig = 0,
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t = p; t <= TMAP && t->lno == lno; ++cnt_orig, ++t);
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cnt_new = svi_opt_screens(sp, ep, lno, NULL);
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}
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TOO_WEIRD;
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if (cnt_orig == cnt_new) {
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do {
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SMAP_FLUSH(p);
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if (svi_line(sp, ep, p, NULL, NULL))
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return (1);
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} while (++p < t);
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return (0);
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}
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if (cnt_orig < cnt_new) {
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/* Get the difference. */
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diff = cnt_new - cnt_orig;
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/*
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* The lines left in the screen override the number of screen
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* lines in the inserted line.
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*/
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cnt = (TMAP - p) + 1;
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if (diff > cnt)
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diff = cnt;
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/* Push down the extra lines. */
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MOVE(sp, p - HMAP, 0);
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if (svi_insertln(sp, diff))
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return (1);
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/* Shift the screen map down. */
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memmove(p + diff, p, (((TMAP - p) - diff) + 1) * sizeof(SMAP));
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|
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/* Fill in the SMAP for the replaced line, and display. */
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for (cnt = 1, t = p; cnt_new-- && t <= TMAP; ++t, ++cnt) {
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t->lno = lno;
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t->off = cnt;
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SMAP_FLUSH(t);
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if (svi_line(sp, ep, t, NULL, NULL))
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return (1);
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}
|
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} else {
|
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/* Get the difference. */
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diff = cnt_orig - cnt_new;
|
|
|
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/* Delete that many lines from the screen. */
|
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MOVE(sp, p - HMAP, 0);
|
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if (svi_deleteln(sp, diff))
|
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return (1);
|
|
|
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/* Shift the screen map up. */
|
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memmove(p, p + diff, (((TMAP - p) - diff) + 1) * sizeof(SMAP));
|
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|
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/* Fill in the SMAP for the replaced line, and display. */
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for (cnt = 1, t = p; cnt_new--; ++t, ++cnt) {
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t->lno = lno;
|
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t->off = cnt;
|
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SMAP_FLUSH(t);
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if (svi_line(sp, ep, t, NULL, NULL))
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return (1);
|
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}
|
|
|
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/* Display the new lines at the bottom of the screen. */
|
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for (t = TMAP - diff;;) {
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if (t < TMAP && svi_sm_next(sp, ep, t, t + 1))
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return (1);
|
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/* svi_sm_next() flushed the cache. */
|
|
if (svi_line(sp, ep, ++t, NULL, NULL))
|
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return (1);
|
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if (t == TMAP)
|
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break;
|
|
}
|
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}
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* svi_sm_scroll
|
|
* Scroll the SMAP up/down count logical lines. Different
|
|
* semantics based on the vi command, *sigh*.
|
|
*/
|
|
int
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|
svi_sm_scroll(sp, ep, rp, count, scmd)
|
|
SCR *sp;
|
|
EXF *ep;
|
|
MARK *rp;
|
|
recno_t count;
|
|
enum sctype scmd;
|
|
{
|
|
SMAP *smp;
|
|
|
|
/*
|
|
* Invalidate the cursor. The line is probably going to change,
|
|
* (although for ^E and ^Y it may not). In any case, the scroll
|
|
* routines move the cursor to draw things.
|
|
*/
|
|
F_SET(SVP(sp), SVI_CUR_INVALID);
|
|
|
|
/* Find the cursor in the screen. */
|
|
if (svi_sm_cursor(sp, ep, &smp))
|
|
return (1);
|
|
|
|
switch (scmd) {
|
|
case CNTRL_B:
|
|
case CNTRL_U:
|
|
case CNTRL_Y:
|
|
case Z_CARAT:
|
|
if (svi_sm_down(sp, ep, rp, count, scmd, smp))
|
|
return (1);
|
|
break;
|
|
case CNTRL_D:
|
|
case CNTRL_E:
|
|
case CNTRL_F:
|
|
case Z_PLUS:
|
|
if (svi_sm_up(sp, ep, rp, count, scmd, smp))
|
|
return (1);
|
|
break;
|
|
default:
|
|
abort();
|
|
}
|
|
|
|
/*
|
|
* !!!
|
|
* If we're at the start of a line, go for the first non-blank.
|
|
* This makes it look like the old vi, even though we're moving
|
|
* around by logical lines, not physical ones.
|
|
*
|
|
* XXX
|
|
* In the presence of a long line, which has more than a screen
|
|
* width of leading spaces, this code can cause a cursor warp.
|
|
* Live with it.
|
|
*/
|
|
if (scmd != CNTRL_E && scmd != CNTRL_Y &&
|
|
rp->cno == 0 && nonblank(sp, ep, rp->lno, &rp->cno))
|
|
return (1);
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* svi_sm_up --
|
|
* Scroll the SMAP up count logical lines.
|
|
*/
|
|
static int
|
|
svi_sm_up(sp, ep, rp, count, scmd, smp)
|
|
SCR *sp;
|
|
EXF *ep;
|
|
MARK *rp;
|
|
enum sctype scmd;
|
|
recno_t count;
|
|
SMAP *smp;
|
|
{
|
|
int cursor_set, echanged, zset;
|
|
SMAP s1, s2;
|
|
|
|
/*
|
|
* Check to see if movement is possible.
|
|
*
|
|
* Get the line after the map. If that line is a new one (and if
|
|
* O_LEFTRIGHT option is set, this has to be true), and the next
|
|
* line doesn't exist, and the cursor doesn't move, or the cursor
|
|
* isn't even on the screen, or the cursor is already at the last
|
|
* line in the map, it's an error. If that test succeeded because
|
|
* the cursor wasn't at the end of the map, test to see if the map
|
|
* is mostly empty.
|
|
*/
|
|
if (svi_sm_next(sp, ep, TMAP, &s1))
|
|
return (1);
|
|
if (s1.lno > TMAP->lno && !file_gline(sp, ep, s1.lno, NULL)) {
|
|
if (scmd == CNTRL_E || scmd == Z_PLUS || smp == TMAP) {
|
|
v_eof(sp, ep, NULL);
|
|
return (1);
|
|
}
|
|
if (svi_sm_next(sp, ep, smp, &s1))
|
|
return (1);
|
|
if (s1.lno > smp->lno && !file_gline(sp, ep, s1.lno, NULL)) {
|
|
v_eof(sp, ep, NULL);
|
|
return (1);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Small screens: see svi/svi_refresh.c:svi_refresh, section 2b.
|
|
*
|
|
* If it's a small screen, and the movement isn't larger than a
|
|
* screen, i.e some context will remain, open up the screen and
|
|
* display by scrolling. In this case, the cursor moves to the
|
|
* first line displayed. Otherwise, erase/compress and repaint,
|
|
* and move the cursor to the first line in the screen. Note,
|
|
* the ^F command is always in the latter case, for historical
|
|
* reasons.
|
|
*/
|
|
cursor_set = 0;
|
|
if (ISSMALLSCREEN(sp)) {
|
|
if (count >= sp->t_maxrows || scmd == CNTRL_F) {
|
|
s1 = TMAP[0];
|
|
if (svi_sm_erase(sp))
|
|
return (1);
|
|
for (; count--; s1 = s2) {
|
|
if (svi_sm_next(sp, ep, &s1, &s2))
|
|
return (1);
|
|
if (s2.lno != s1.lno &&
|
|
!file_gline(sp, ep, s2.lno, NULL))
|
|
break;
|
|
}
|
|
TMAP[0] = s2;
|
|
if (svi_sm_fill(sp, ep, OOBLNO, P_BOTTOM))
|
|
return (1);
|
|
return (svi_sm_position(sp, ep, rp, 0, P_TOP));
|
|
}
|
|
for (; count &&
|
|
sp->t_rows != sp->t_maxrows; --count, ++sp->t_rows) {
|
|
if (svi_sm_next(sp, ep, TMAP, &s1))
|
|
return (1);
|
|
if (TMAP->lno != s1.lno &&
|
|
!file_gline(sp, ep, s1.lno, NULL))
|
|
break;
|
|
*++TMAP = s1;
|
|
/* svi_sm_next() flushed the cache. */
|
|
if (svi_line(sp, ep, TMAP, NULL, NULL))
|
|
return (1);
|
|
|
|
if (scmd != CNTRL_E && !cursor_set) {
|
|
cursor_set = 1;
|
|
rp->lno = TMAP->lno;
|
|
rp->cno = TMAP->c_sboff;
|
|
}
|
|
}
|
|
if (count == 0)
|
|
return (0);
|
|
}
|
|
|
|
for (echanged = zset = 0; count; --count) {
|
|
/* Decide what would show up on the screen. */
|
|
if (svi_sm_next(sp, ep, TMAP, &s1))
|
|
return (1);
|
|
|
|
/* If the line doesn't exist, we're done. */
|
|
if (TMAP->lno != s1.lno && !file_gline(sp, ep, s1.lno, NULL))
|
|
break;
|
|
|
|
/* Scroll the screen cursor up one logical line. */
|
|
if (svi_sm_1up(sp, ep))
|
|
return (1);
|
|
switch (scmd) {
|
|
case CNTRL_E:
|
|
if (smp > HMAP)
|
|
--smp;
|
|
else
|
|
echanged = 1;
|
|
break;
|
|
case Z_PLUS:
|
|
if (zset) {
|
|
if (smp > HMAP)
|
|
--smp;
|
|
} else {
|
|
smp = TMAP;
|
|
zset = 1;
|
|
}
|
|
/* FALLTHROUGH */
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (cursor_set)
|
|
return(0);
|
|
|
|
switch (scmd) {
|
|
case CNTRL_E:
|
|
/*
|
|
* On a ^E that was forced to change lines, try and keep the
|
|
* cursor as close as possible to the last position, but also
|
|
* set it up so that the next "real" movement will return the
|
|
* cursor to the closest position to the last real movement.
|
|
*/
|
|
if (echanged) {
|
|
rp->lno = smp->lno;
|
|
rp->cno =
|
|
svi_cm_private(sp, ep, smp->lno, smp->off, sp->rcm);
|
|
}
|
|
return (0);
|
|
case CNTRL_F:
|
|
/*
|
|
* If there are more lines, the ^F command is always
|
|
* positioned at the first line of the screen.
|
|
*/
|
|
if (!count) {
|
|
smp = HMAP;
|
|
break;
|
|
}
|
|
/* FALLTHROUGH */
|
|
case CNTRL_D:
|
|
/*
|
|
* The ^D and ^F commands move the cursor towards EOF
|
|
* if there are more lines to move. Check to be sure
|
|
* the lines actually exist. (They may not if the
|
|
* file is smaller than the screen.)
|
|
*/
|
|
for (; count; --count, ++smp)
|
|
if (smp == TMAP ||
|
|
!file_gline(sp, ep, smp[1].lno, NULL))
|
|
break;
|
|
break;
|
|
case Z_PLUS:
|
|
/* The z+ command moves the cursor to the first new line. */
|
|
break;
|
|
default:
|
|
abort();
|
|
}
|
|
|
|
if (!SMAP_CACHE(smp) && svi_line(sp, ep, smp, NULL, NULL))
|
|
return (1);
|
|
rp->lno = smp->lno;
|
|
rp->cno = smp->c_sboff;
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* svi_sm_1up --
|
|
* Scroll the SMAP up one.
|
|
*/
|
|
int
|
|
svi_sm_1up(sp, ep)
|
|
SCR *sp;
|
|
EXF *ep;
|
|
{
|
|
/*
|
|
* Delete the top line of the screen. Shift the screen map up.
|
|
* Display a new line at the bottom of the screen.
|
|
*/
|
|
MOVE(sp, 0, 0);
|
|
if (svi_deleteln(sp, 1))
|
|
return (1);
|
|
|
|
/* One-line screens can fail. */
|
|
if (HMAP == TMAP) {
|
|
if (svi_sm_next(sp, ep, TMAP, TMAP))
|
|
return (1);
|
|
} else {
|
|
memmove(HMAP, HMAP + 1, (sp->rows - 1) * sizeof(SMAP));
|
|
if (svi_sm_next(sp, ep, TMAP - 1, TMAP))
|
|
return (1);
|
|
}
|
|
/* svi_sm_next() flushed the cache. */
|
|
if (svi_line(sp, ep, TMAP, NULL, NULL))
|
|
return (1);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* svi_deleteln --
|
|
* Delete a line a la curses, make sure to put the information
|
|
* line and other screens back.
|
|
*/
|
|
static int
|
|
svi_deleteln(sp, cnt)
|
|
SCR *sp;
|
|
int cnt;
|
|
{
|
|
size_t oldy, oldx;
|
|
|
|
getyx(stdscr, oldy, oldx);
|
|
while (cnt--) {
|
|
deleteln();
|
|
MOVE(sp, INFOLINE(sp) - 1, 0);
|
|
insertln();
|
|
MOVEA(sp, oldy, oldx);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* svi_sm_down --
|
|
* Scroll the SMAP down count logical lines.
|
|
*/
|
|
static int
|
|
svi_sm_down(sp, ep, rp, count, scmd, smp)
|
|
SCR *sp;
|
|
EXF *ep;
|
|
MARK *rp;
|
|
recno_t count;
|
|
SMAP *smp;
|
|
enum sctype scmd;
|
|
{
|
|
SMAP s1, s2;
|
|
int cursor_set, ychanged, zset;
|
|
|
|
/* Check to see if movement is possible. */
|
|
if (HMAP->lno == 1 && HMAP->off == 1 &&
|
|
(scmd == CNTRL_Y || scmd == Z_CARAT || smp == HMAP)) {
|
|
v_sof(sp, NULL);
|
|
return (1);
|
|
}
|
|
|
|
/*
|
|
* Small screens: see svi/svi_refresh.c:svi_refresh, section 2b.
|
|
*
|
|
* If it's a small screen, and the movement isn't larger than a
|
|
* screen, i.e some context will remain, open up the screen and
|
|
* display by scrolling. In this case, the cursor moves to the
|
|
* first line displayed. Otherwise, erase/compress and repaint,
|
|
* and move the cursor to the first line in the screen. Note,
|
|
* the ^B command is always in the latter case, for historical
|
|
* reasons.
|
|
*/
|
|
cursor_set = scmd == CNTRL_Y;
|
|
if (ISSMALLSCREEN(sp)) {
|
|
if (count >= sp->t_maxrows || scmd == CNTRL_B) {
|
|
s1 = HMAP[0];
|
|
if (svi_sm_erase(sp))
|
|
return (1);
|
|
for (; count--; s1 = s2) {
|
|
if (svi_sm_prev(sp, ep, &s1, &s2))
|
|
return (1);
|
|
if (s2.lno == 1 && s2.off == 1)
|
|
break;
|
|
}
|
|
HMAP[0] = s2;
|
|
if (svi_sm_fill(sp, ep, OOBLNO, P_TOP))
|
|
return (1);
|
|
return (svi_sm_position(sp, ep, rp, 0, P_BOTTOM));
|
|
}
|
|
for (; count &&
|
|
sp->t_rows != sp->t_maxrows; --count, ++sp->t_rows) {
|
|
if (HMAP->lno == 1 || HMAP->off == 1)
|
|
break;
|
|
++TMAP;
|
|
if (svi_sm_1down(sp, ep))
|
|
return (1);
|
|
if (scmd != CNTRL_Y && !cursor_set) {
|
|
cursor_set = 1;
|
|
if (svi_sm_position(sp, ep, rp, 0, P_BOTTOM))
|
|
return (1);
|
|
}
|
|
}
|
|
if (count == 0)
|
|
return (0);
|
|
}
|
|
|
|
for (ychanged = zset = 0; count; --count) {
|
|
/* If the line doesn't exist, we're done. */
|
|
if (HMAP->lno == 1 && HMAP->off == 1)
|
|
break;
|
|
|
|
/* Scroll the screen and cursor down one logical line. */
|
|
if (svi_sm_1down(sp, ep))
|
|
return (1);
|
|
switch (scmd) {
|
|
case CNTRL_Y:
|
|
if (smp < TMAP)
|
|
++smp;
|
|
else
|
|
ychanged = 1;
|
|
break;
|
|
case Z_CARAT:
|
|
if (zset) {
|
|
if (smp < TMAP)
|
|
++smp;
|
|
} else {
|
|
smp = HMAP;
|
|
zset = 1;
|
|
}
|
|
/* FALLTHROUGH */
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (scmd != CNTRL_Y && cursor_set)
|
|
return(0);
|
|
|
|
switch (scmd) {
|
|
case CNTRL_B:
|
|
/*
|
|
* If there are more lines, the ^B command is always
|
|
* positioned at the last line of the screen.
|
|
*/
|
|
if (!count) {
|
|
smp = TMAP;
|
|
break;
|
|
}
|
|
/* FALLTHROUGH */
|
|
case CNTRL_U:
|
|
/*
|
|
* The ^B and ^U commands move the cursor towards SOF
|
|
* if there are more lines to move.
|
|
*/
|
|
if (count < smp - HMAP)
|
|
smp -= count;
|
|
else
|
|
smp = HMAP;
|
|
break;
|
|
case CNTRL_Y:
|
|
/*
|
|
* On a ^Y that was forced to change lines, try and keep the
|
|
* cursor as close as possible to the last position, but also
|
|
* set it up so that the next "real" movement will return the
|
|
* cursor to the closest position to the last real movement.
|
|
*/
|
|
if (ychanged) {
|
|
rp->lno = smp->lno;
|
|
rp->cno =
|
|
svi_cm_private(sp, ep, smp->lno, smp->off, sp->rcm);
|
|
}
|
|
return (0);
|
|
case Z_CARAT:
|
|
/* The z^ command moves the cursor to the first new line. */
|
|
break;
|
|
default:
|
|
abort();
|
|
}
|
|
|
|
if (!SMAP_CACHE(smp) && svi_line(sp, ep, smp, NULL, NULL))
|
|
return (1);
|
|
rp->lno = smp->lno;
|
|
rp->cno = smp->c_sboff;
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* svi_sm_erase --
|
|
* Erase the small screen area for the scrolling functions.
|
|
*/
|
|
static int
|
|
svi_sm_erase(sp)
|
|
SCR *sp;
|
|
{
|
|
MOVE(sp, INFOLINE(sp), 0);
|
|
clrtoeol();
|
|
for (; sp->t_rows > sp->t_minrows; --sp->t_rows, --TMAP) {
|
|
MOVE(sp, TMAP - HMAP, 0);
|
|
clrtoeol();
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* svi_sm_1down --
|
|
* Scroll the SMAP down one.
|
|
*/
|
|
int
|
|
svi_sm_1down(sp, ep)
|
|
SCR *sp;
|
|
EXF *ep;
|
|
{
|
|
/*
|
|
* Clear the bottom line of the screen, insert a line at the top
|
|
* of the screen. Shift the screen map down, display a new line
|
|
* at the top of the screen.
|
|
*/
|
|
MOVE(sp, sp->t_rows, 0);
|
|
clrtoeol();
|
|
MOVE(sp, 0, 0);
|
|
if (svi_insertln(sp, 1))
|
|
return (1);
|
|
memmove(HMAP + 1, HMAP, (sp->rows - 1) * sizeof(SMAP));
|
|
if (svi_sm_prev(sp, ep, HMAP + 1, HMAP))
|
|
return (1);
|
|
/* svi_sm_prev() flushed the cache. */
|
|
if (svi_line(sp, ep, HMAP, NULL, NULL))
|
|
return (1);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* svi_insertln --
|
|
* Insert a line a la curses, make sure to put the information
|
|
* line and other screens back.
|
|
*/
|
|
static int
|
|
svi_insertln(sp, cnt)
|
|
SCR *sp;
|
|
int cnt;
|
|
{
|
|
size_t oldy, oldx;
|
|
|
|
getyx(stdscr, oldy, oldx);
|
|
while (cnt--) {
|
|
MOVE(sp, INFOLINE(sp) - 1, 0);
|
|
deleteln();
|
|
MOVEA(sp, oldy, oldx);
|
|
insertln();
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* svi_sm_next --
|
|
* Fill in the next entry in the SMAP.
|
|
*/
|
|
int
|
|
svi_sm_next(sp, ep, p, t)
|
|
SCR *sp;
|
|
EXF *ep;
|
|
SMAP *p, *t;
|
|
{
|
|
size_t lcnt;
|
|
|
|
SMAP_FLUSH(t);
|
|
if (O_ISSET(sp, O_LEFTRIGHT)) {
|
|
t->lno = p->lno + 1;
|
|
t->off = p->off;
|
|
} else {
|
|
lcnt = svi_opt_screens(sp, ep, p->lno, NULL);
|
|
if (lcnt == p->off) {
|
|
t->lno = p->lno + 1;
|
|
t->off = 1;
|
|
} else {
|
|
t->lno = p->lno;
|
|
t->off = p->off + 1;
|
|
}
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* svi_sm_prev --
|
|
* Fill in the previous entry in the SMAP.
|
|
*/
|
|
int
|
|
svi_sm_prev(sp, ep, p, t)
|
|
SCR *sp;
|
|
EXF *ep;
|
|
SMAP *p, *t;
|
|
{
|
|
SMAP_FLUSH(t);
|
|
if (O_ISSET(sp, O_LEFTRIGHT)) {
|
|
t->lno = p->lno - 1;
|
|
t->off = p->off;
|
|
} else if (p->off != 1) {
|
|
t->lno = p->lno;
|
|
t->off = p->off - 1;
|
|
} else {
|
|
t->lno = p->lno - 1;
|
|
t->off = svi_opt_screens(sp, ep, t->lno, NULL);
|
|
}
|
|
return (t->lno == 0);
|
|
}
|
|
|
|
/*
|
|
* svi_sm_cursor --
|
|
* Return the SMAP entry referenced by the cursor.
|
|
*/
|
|
int
|
|
svi_sm_cursor(sp, ep, smpp)
|
|
SCR *sp;
|
|
EXF *ep;
|
|
SMAP **smpp;
|
|
{
|
|
SMAP *p;
|
|
|
|
/* See if the cursor is not in the map. */
|
|
if (sp->lno < HMAP->lno || sp->lno > TMAP->lno)
|
|
return (1);
|
|
|
|
/* Find the first occurence of the line. */
|
|
for (p = HMAP; p->lno != sp->lno; ++p);
|
|
|
|
/* Fill in the map information until we find the right line. */
|
|
for (; p <= TMAP; ++p) {
|
|
/* Short lines are common and easy to detect. */
|
|
if (p != TMAP && (p + 1)->lno != p->lno) {
|
|
*smpp = p;
|
|
return (0);
|
|
}
|
|
if (!SMAP_CACHE(p) && svi_line(sp, ep, p, NULL, NULL))
|
|
return (1);
|
|
if (p->c_eboff >= sp->cno) {
|
|
*smpp = p;
|
|
return (0);
|
|
}
|
|
}
|
|
|
|
/* It was past the end of the map after all. */
|
|
return (1);
|
|
}
|
|
|
|
/*
|
|
* svi_sm_position --
|
|
* Return the line/column of the top, middle or last line on the screen.
|
|
* (The vi H, M and L commands.) Here because only the screen routines
|
|
* know what's really out there.
|
|
*/
|
|
int
|
|
svi_sm_position(sp, ep, rp, cnt, pos)
|
|
SCR *sp;
|
|
EXF *ep;
|
|
MARK *rp;
|
|
u_long cnt;
|
|
enum position pos;
|
|
{
|
|
SMAP *smp;
|
|
recno_t last;
|
|
|
|
switch (pos) {
|
|
case P_TOP:
|
|
/*
|
|
* !!!
|
|
* Historically, an invalid count to the H command failed.
|
|
* We do nothing special here, just making sure that H in
|
|
* an empty screen works.
|
|
*/
|
|
if (cnt > TMAP - HMAP)
|
|
goto sof;
|
|
smp = HMAP + cnt;
|
|
if (cnt && file_gline(sp, ep, smp->lno, NULL) == NULL) {
|
|
sof: msgq(sp, M_BERR, "Movement past the end-of-screen");
|
|
return (1);
|
|
}
|
|
break;
|
|
case P_MIDDLE:
|
|
/*
|
|
* !!!
|
|
* Historically, a count to the M command was ignored.
|
|
* If the screen isn't filled, find the middle of what's
|
|
* real and move there.
|
|
*/
|
|
if (file_gline(sp, ep, TMAP->lno, NULL) == NULL) {
|
|
if (file_lline(sp, ep, &last))
|
|
return (1);
|
|
for (smp = TMAP; smp->lno > last && smp > HMAP; --smp);
|
|
if (smp > HMAP)
|
|
smp -= (smp - HMAP) / 2;
|
|
} else
|
|
smp = (HMAP + (TMAP - HMAP) / 2) + cnt;
|
|
break;
|
|
case P_BOTTOM:
|
|
/*
|
|
* !!!
|
|
* Historically, an invalid count to the L command failed.
|
|
* If the screen isn't filled, find the bottom of what's
|
|
* real and try to offset from there.
|
|
*/
|
|
if (cnt > TMAP - HMAP)
|
|
goto eof;
|
|
smp = TMAP - cnt;
|
|
if (file_gline(sp, ep, smp->lno, NULL) == NULL) {
|
|
if (file_lline(sp, ep, &last))
|
|
return (1);
|
|
for (; smp->lno > last && smp > HMAP; --smp);
|
|
if (cnt > smp - HMAP) {
|
|
eof: msgq(sp, M_BERR,
|
|
"Movement past the beginning-of-screen");
|
|
return (1);
|
|
}
|
|
smp -= cnt;
|
|
}
|
|
break;
|
|
default:
|
|
abort();
|
|
}
|
|
|
|
/* Make sure that the cached information is valid. */
|
|
if (!SMAP_CACHE(smp) && svi_line(sp, ep, smp, NULL, NULL))
|
|
return (1);
|
|
rp->lno = smp->lno;
|
|
rp->cno = smp->c_sboff;
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* svi_sm_nlines --
|
|
* Return the number of screen lines from an SMAP entry to the
|
|
* start of some file line, less than a maximum value.
|
|
*/
|
|
recno_t
|
|
svi_sm_nlines(sp, ep, from_sp, to_lno, max)
|
|
SCR *sp;
|
|
EXF *ep;
|
|
SMAP *from_sp;
|
|
recno_t to_lno;
|
|
size_t max;
|
|
{
|
|
recno_t lno, lcnt;
|
|
|
|
if (O_ISSET(sp, O_LEFTRIGHT))
|
|
return (from_sp->lno > to_lno ?
|
|
from_sp->lno - to_lno : to_lno - from_sp->lno);
|
|
|
|
if (from_sp->lno == to_lno)
|
|
return (from_sp->off - 1);
|
|
|
|
if (from_sp->lno > to_lno) {
|
|
lcnt = from_sp->off - 1; /* Correct for off-by-one. */
|
|
for (lno = from_sp->lno; --lno >= to_lno && lcnt <= max;)
|
|
lcnt += svi_opt_screens(sp, ep, lno, NULL);
|
|
} else {
|
|
lno = from_sp->lno;
|
|
lcnt = (svi_opt_screens(sp, ep, lno, NULL) - from_sp->off) + 1;
|
|
for (; ++lno < to_lno && lcnt <= max;)
|
|
lcnt += svi_opt_screens(sp, ep, lno, NULL);
|
|
}
|
|
return (lcnt);
|
|
}
|