f0957ccae4
This is the gsoc-2011 project to clean up and backport multibyte support from other nvi forks in a form we can use. USE_WIDECHAR is on unless building for the rescue crunchgen. This should allow editing in the native locale encoding. USE_ICONV depends on make.conf having 'WITH_ICONV=YES' for now. This adds the ability to do things like edit a KOI8-R file while having $LANG set to (say) en_US.UTF-8. iconv is used to transcode the characters for display. Other points: * It uses gencat and catopen/etc instead of homegrown msg catalog stuff. * A lot of stuff has been trimmed out, eg: the perl and tcl bindings which we could never use in base anyway. * It uses ncursesw when in widechar mode. This could be interesting. GSoC info: http://www.google-melange.com/gsoc/proposal/review/google/gsoc2011/zy/1 Repo at: https://github.com/lichray/nvi2 Obtained from: Zhihao Yuan <lichray@gmail.com>
1243 lines
28 KiB
C
1243 lines
28 KiB
C
/*-
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* Copyright (c) 1993, 1994
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* The Regents of the University of California. All rights reserved.
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* Copyright (c) 1993, 1994, 1995, 1996
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* Keith Bostic. All rights reserved.
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*
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* See the LICENSE file for redistribution information.
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*/
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#include "config.h"
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#ifndef lint
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static const char sccsid[] = "$Id: vs_smap.c,v 10.31 2011/02/26 13:56:21 skimo Exp $";
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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 <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "../common/common.h"
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#include "vi.h"
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static int vs_deleteln __P((SCR *, int));
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static int vs_insertln __P((SCR *, int));
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static int vs_sm_delete __P((SCR *, recno_t));
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static int vs_sm_down __P((SCR *, MARK *, recno_t, scroll_t, SMAP *));
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static int vs_sm_erase __P((SCR *));
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static int vs_sm_insert __P((SCR *, recno_t));
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static int vs_sm_reset __P((SCR *, recno_t));
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static int vs_sm_up __P((SCR *, MARK *, recno_t, scroll_t, SMAP *));
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/*
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* vs_change --
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* Make a change to the screen.
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*
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* PUBLIC: int vs_change __P((SCR *, recno_t, lnop_t));
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*/
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int
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vs_change(SCR *sp, recno_t lno, lnop_t op)
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{
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VI_PRIVATE *vip;
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SMAP *p;
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size_t cnt, oldy, oldx;
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vip = VIP(sp);
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/*
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* XXX
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* Very nasty special case. The historic vi code displays a single
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* space (or a '$' if the list option is set) for the first line in
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* an "empty" file. If we "insert" a line, that line gets scrolled
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* down, not repainted, so it's incorrect when we refresh the screen.
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* The vi text input functions detect it explicitly and don't insert
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* a new line.
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*
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* Check for line #2 before going to the end of the file.
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*/
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if (((op == LINE_APPEND && lno == 0) ||
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(op == LINE_INSERT && lno == 1)) &&
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!db_exist(sp, 2)) {
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lno = 1;
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op = LINE_RESET;
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}
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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, cnt = sp->t_rows; cnt--; ++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(vip, VIP_N_RENUMBER);
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break;
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case LINE_INSERT:
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for (p = HMAP, cnt = sp->t_rows; cnt--; ++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(vip, VIP_N_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(vip, VIP_N_REFRESH);
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/*
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* Invalidate the line size cache, and invalidate the cursor if it's
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* on this line,
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*/
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VI_SCR_CFLUSH(vip);
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if (sp->lno == lno)
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F_SET(vip, VIP_CUR_INVALID);
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/*
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* If ex modifies the screen after ex output is already on the screen
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* or if we've switched into ex canonical mode, don't touch it -- we'll
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* get scrolling wrong, at best.
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*/
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if (!F_ISSET(sp, SC_TINPUT_INFO) &&
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(F_ISSET(sp, SC_SCR_EXWROTE) || VIP(sp)->totalcount > 1)) {
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F_SET(vip, VIP_N_EX_REDRAW);
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return (0);
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}
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/* Save and restore the cursor for these routines. */
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(void)sp->gp->scr_cursor(sp, &oldy, &oldx);
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switch (op) {
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case LINE_DELETE:
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if (vs_sm_delete(sp, lno))
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return (1);
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if (sp->lno > lno)
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--sp->lno;
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F_SET(vip, VIP_N_RENUMBER);
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break;
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case LINE_INSERT:
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if (vs_sm_insert(sp, lno))
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return (1);
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if (sp->lno > lno)
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++sp->lno;
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F_SET(vip, VIP_N_RENUMBER);
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break;
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case LINE_RESET:
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if (vs_sm_reset(sp, 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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(void)sp->gp->scr_move(sp, oldy, oldx);
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return (0);
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}
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/*
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* vs_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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* PUBLIC: int vs_sm_fill __P((SCR *, recno_t, pos_t));
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*/
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int
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vs_sm_fill(SCR *sp, recno_t lno, pos_t pos)
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{
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SMAP *p, tmp;
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size_t cnt;
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/* Flush all cached information from the SMAP. */
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for (p = HMAP, cnt = sp->t_rows; cnt--; ++p)
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SMAP_FLUSH(p);
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/*
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* If the map is filled, the screen must be redrawn.
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*
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* XXX
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* This is a bug. We should try and figure out if the desired line
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* is already in the map or close by -- scrolling the screen would
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* be a lot better than redrawing.
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*/
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F_SET(sp, SC_SCR_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.coff = 0;
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tmp.soff = 1;
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/* See if less than half a screen from the top. */
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if (vs_sm_nlines(sp,
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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 (db_last(sp, &tmp.lno))
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return (1);
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tmp.coff = 0;
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tmp.soff = vs_screens(sp, tmp.lno, NULL);
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if (vs_sm_nlines(sp,
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&tmp, lno, HALFTEXT(sp)) <= HALFTEXT(sp)) {
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TMAP->lno = tmp.lno;
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TMAP->coff = tmp.coff;
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TMAP->soff = tmp.soff;
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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->coff = 0;
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HMAP->soff = 1;
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} else {
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/*
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* If number of lines HMAP->lno (top line) spans
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* changed due to, say reformatting, and now is
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* fewer than HMAP->soff, reset so the line is
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* redrawn at the top of the screen.
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*/
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cnt = vs_screens(sp, HMAP->lno, NULL);
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if (cnt < HMAP->soff)
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HMAP->soff = 1;
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}
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/* If we fail, just punt. */
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for (p = HMAP, cnt = sp->t_rows; --cnt; ++p)
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if (vs_sm_next(sp, 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 + sp->t_rows / 2;
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p->lno = lno;
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p->coff = 0;
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p->soff = 1;
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for (; p > HMAP; --p)
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if (vs_sm_prev(sp, 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 + sp->t_rows / 2;
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for (; p < TMAP; ++p)
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if (vs_sm_next(sp, 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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TMAP->coff = 0;
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TMAP->soff = vs_screens(sp, 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 (vs_sm_prev(sp, 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, we have a
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* serious hard error.
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*/
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err: HMAP->lno = 1;
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HMAP->coff = 0;
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HMAP->soff = 1;
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for (p = HMAP; p < TMAP; ++p)
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if (vs_sm_next(sp, 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 vs_sm_reset, vs_sm_delete and vs_sm_insert: if the
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* screen contains only a single line (whether because the screen is small
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* or the line large), it gets fairly exciting. Skip the fun, set a flag
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* so the screen map is refilled and the screen redrawn, and return. This
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* is amazingly slow, but it's not clear that anyone will care.
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*/
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#define HANDLE_WEIRDNESS(cnt) { \
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if (cnt >= sp->t_rows) { \
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F_SET(sp, SC_SCR_REFORMAT); \
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return (0); \
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} \
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}
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/*
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* vs_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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vs_sm_delete(SCR *sp, 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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HANDLE_WEIRDNESS(cnt_orig);
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/* Delete that many lines from the screen. */
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(void)sp->gp->scr_move(sp, p - HMAP, 0);
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if (vs_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 && vs_sm_next(sp, p, p + 1))
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return (1);
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/* vs_sm_next() flushed the cache. */
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if (vs_line(sp, ++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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* vs_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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vs_sm_insert(SCR *sp, recno_t lno)
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{
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SMAP *p, *t;
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size_t cnt_orig, cnt, coff;
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/* Save the offset. */
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coff = HMAP->coff;
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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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cnt_orig = vs_screens(sp, lno, NULL);
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HANDLE_WEIRDNESS(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 (cnt_orig > cnt)
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cnt_orig = cnt;
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/* Push down that many lines. */
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(void)sp->gp->scr_move(sp, p - HMAP, 0);
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if (vs_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->coff = coff;
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t->soff = cnt;
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SMAP_FLUSH(t);
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if (vs_line(sp, 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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* vs_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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vs_sm_reset(SCR *sp, 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 = vs_screens(sp, lno, NULL);
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}
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HANDLE_WEIRDNESS(cnt_orig);
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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 (vs_line(sp, 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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/* If there are any following lines, push them down. */
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if (cnt > 1) {
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(void)sp->gp->scr_move(sp, p - HMAP, 0);
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if (vs_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,
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(((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->soff = cnt;
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SMAP_FLUSH(t);
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if (vs_line(sp, 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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|
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/* Delete that many lines from the screen. */
|
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(void)sp->gp->scr_move(sp, p - HMAP, 0);
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if (vs_deleteln(sp, diff))
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return (1);
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|
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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->soff = cnt;
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SMAP_FLUSH(t);
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if (vs_line(sp, t, NULL, NULL))
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return (1);
|
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}
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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;;) {
|
|
if (t < TMAP && vs_sm_next(sp, t, t + 1))
|
|
return (1);
|
|
/* vs_sm_next() flushed the cache. */
|
|
if (vs_line(sp, ++t, NULL, NULL))
|
|
return (1);
|
|
if (t == TMAP)
|
|
break;
|
|
}
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* vs_sm_scroll
|
|
* Scroll the SMAP up/down count logical lines. Different
|
|
* semantics based on the vi command, *sigh*.
|
|
*
|
|
* PUBLIC: int vs_sm_scroll __P((SCR *, MARK *, recno_t, scroll_t));
|
|
*/
|
|
int
|
|
vs_sm_scroll(SCR *sp, MARK *rp, recno_t count, scroll_t 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(VIP(sp), VIP_CUR_INVALID);
|
|
|
|
/* Find the cursor in the screen. */
|
|
if (vs_sm_cursor(sp, &smp))
|
|
return (1);
|
|
|
|
switch (scmd) {
|
|
case CNTRL_B:
|
|
case CNTRL_U:
|
|
case CNTRL_Y:
|
|
case Z_CARAT:
|
|
if (vs_sm_down(sp, rp, count, scmd, smp))
|
|
return (1);
|
|
break;
|
|
case CNTRL_D:
|
|
case CNTRL_E:
|
|
case CNTRL_F:
|
|
case Z_PLUS:
|
|
if (vs_sm_up(sp, 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, rp->lno, &rp->cno))
|
|
return (1);
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* vs_sm_up --
|
|
* Scroll the SMAP up count logical lines.
|
|
*/
|
|
static int
|
|
vs_sm_up(SCR *sp, MARK *rp, recno_t count, scroll_t scmd, SMAP *smp)
|
|
{
|
|
int cursor_set, echanged, zset;
|
|
SMAP *ssmp, 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 (vs_sm_next(sp, TMAP, &s1))
|
|
return (1);
|
|
if (s1.lno > TMAP->lno && !db_exist(sp, s1.lno)) {
|
|
if (scmd == CNTRL_E || scmd == Z_PLUS || smp == TMAP) {
|
|
v_eof(sp, NULL);
|
|
return (1);
|
|
}
|
|
if (vs_sm_next(sp, smp, &s1))
|
|
return (1);
|
|
if (s1.lno > smp->lno && !db_exist(sp, s1.lno)) {
|
|
v_eof(sp, NULL);
|
|
return (1);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Small screens: see vs_refresh.c section 6a.
|
|
*
|
|
* 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 down one
|
|
* line for each 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 (IS_SMALL(sp)) {
|
|
if (count >= sp->t_maxrows || scmd == CNTRL_F) {
|
|
s1 = TMAP[0];
|
|
if (vs_sm_erase(sp))
|
|
return (1);
|
|
for (; count--; s1 = s2) {
|
|
if (vs_sm_next(sp, &s1, &s2))
|
|
return (1);
|
|
if (s2.lno != s1.lno && !db_exist(sp, s2.lno))
|
|
break;
|
|
}
|
|
TMAP[0] = s2;
|
|
if (vs_sm_fill(sp, OOBLNO, P_BOTTOM))
|
|
return (1);
|
|
return (vs_sm_position(sp, rp, 0, P_TOP));
|
|
}
|
|
cursor_set = scmd == CNTRL_E || vs_sm_cursor(sp, &ssmp);
|
|
for (; count &&
|
|
sp->t_rows != sp->t_maxrows; --count, ++sp->t_rows) {
|
|
if (vs_sm_next(sp, TMAP, &s1))
|
|
return (1);
|
|
if (TMAP->lno != s1.lno && !db_exist(sp, s1.lno))
|
|
break;
|
|
*++TMAP = s1;
|
|
/* vs_sm_next() flushed the cache. */
|
|
if (vs_line(sp, TMAP, NULL, NULL))
|
|
return (1);
|
|
|
|
if (!cursor_set)
|
|
++ssmp;
|
|
}
|
|
if (!cursor_set) {
|
|
rp->lno = ssmp->lno;
|
|
rp->cno = ssmp->c_sboff;
|
|
}
|
|
if (count == 0)
|
|
return (0);
|
|
}
|
|
|
|
for (echanged = zset = 0; count; --count) {
|
|
/* Decide what would show up on the screen. */
|
|
if (vs_sm_next(sp, TMAP, &s1))
|
|
return (1);
|
|
|
|
/* If the line doesn't exist, we're done. */
|
|
if (TMAP->lno != s1.lno && !db_exist(sp, s1.lno))
|
|
break;
|
|
|
|
/* Scroll the screen cursor up one logical line. */
|
|
if (vs_sm_1up(sp))
|
|
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 = vs_colpos(sp, smp->lno,
|
|
(O_ISSET(sp, O_LEFTRIGHT) ?
|
|
smp->coff : (smp->soff - 1) * sp->cols) +
|
|
sp->rcm % sp->cols);
|
|
}
|
|
return (0);
|
|
case CNTRL_F:
|
|
/*
|
|
* If there are more lines, the ^F command is 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 || !db_exist(sp, smp[1].lno))
|
|
break;
|
|
break;
|
|
case Z_PLUS:
|
|
/* The z+ command moves the cursor to the first new line. */
|
|
break;
|
|
default:
|
|
abort();
|
|
}
|
|
|
|
if (!SMAP_CACHE(smp) && vs_line(sp, smp, NULL, NULL))
|
|
return (1);
|
|
rp->lno = smp->lno;
|
|
rp->cno = smp->c_scoff == 255 ? 0 : smp->c_sboff;
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* vs_sm_1up --
|
|
* Scroll the SMAP up one.
|
|
*
|
|
* PUBLIC: int vs_sm_1up __P((SCR *));
|
|
*/
|
|
int
|
|
vs_sm_1up(SCR *sp)
|
|
{
|
|
/*
|
|
* Delete the top line of the screen. Shift the screen map
|
|
* up and display a new line at the bottom of the screen.
|
|
*/
|
|
(void)sp->gp->scr_move(sp, 0, 0);
|
|
if (vs_deleteln(sp, 1))
|
|
return (1);
|
|
|
|
/* One-line screens can fail. */
|
|
if (IS_ONELINE(sp)) {
|
|
if (vs_sm_next(sp, TMAP, TMAP))
|
|
return (1);
|
|
} else {
|
|
memmove(HMAP, HMAP + 1, (sp->rows - 1) * sizeof(SMAP));
|
|
if (vs_sm_next(sp, TMAP - 1, TMAP))
|
|
return (1);
|
|
}
|
|
/* vs_sm_next() flushed the cache. */
|
|
return (vs_line(sp, TMAP, NULL, NULL));
|
|
}
|
|
|
|
/*
|
|
* vs_deleteln --
|
|
* Delete a line a la curses, make sure to put the information
|
|
* line and other screens back.
|
|
*/
|
|
static int
|
|
vs_deleteln(SCR *sp, int cnt)
|
|
{
|
|
GS *gp;
|
|
size_t oldy, oldx;
|
|
|
|
gp = sp->gp;
|
|
|
|
/* If the screen is vertically split, we can't scroll it. */
|
|
if (IS_VSPLIT(sp)) {
|
|
F_SET(sp, SC_SCR_REDRAW);
|
|
return (0);
|
|
}
|
|
|
|
if (IS_ONELINE(sp))
|
|
(void)gp->scr_clrtoeol(sp);
|
|
else {
|
|
(void)gp->scr_cursor(sp, &oldy, &oldx);
|
|
while (cnt--) {
|
|
(void)gp->scr_deleteln(sp);
|
|
(void)gp->scr_move(sp, LASTLINE(sp), 0);
|
|
(void)gp->scr_insertln(sp);
|
|
(void)gp->scr_move(sp, oldy, oldx);
|
|
}
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* vs_sm_down --
|
|
* Scroll the SMAP down count logical lines.
|
|
*/
|
|
static int
|
|
vs_sm_down(SCR *sp, MARK *rp, recno_t count, scroll_t scmd, SMAP *smp)
|
|
{
|
|
SMAP *ssmp, s1, s2;
|
|
int cursor_set, ychanged, zset;
|
|
|
|
/* Check to see if movement is possible. */
|
|
if (HMAP->lno == 1 &&
|
|
(O_ISSET(sp, O_LEFTRIGHT) || HMAP->soff == 1) &&
|
|
(scmd == CNTRL_Y || scmd == Z_CARAT || smp == HMAP)) {
|
|
v_sof(sp, NULL);
|
|
return (1);
|
|
}
|
|
|
|
/*
|
|
* Small screens: see vs_refresh.c section 6a.
|
|
*
|
|
* 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 up one
|
|
* line for each 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 (IS_SMALL(sp)) {
|
|
if (count >= sp->t_maxrows || scmd == CNTRL_B) {
|
|
s1 = HMAP[0];
|
|
if (vs_sm_erase(sp))
|
|
return (1);
|
|
for (; count--; s1 = s2) {
|
|
if (vs_sm_prev(sp, &s1, &s2))
|
|
return (1);
|
|
if (s2.lno == 1 &&
|
|
(O_ISSET(sp, O_LEFTRIGHT) || s2.soff == 1))
|
|
break;
|
|
}
|
|
HMAP[0] = s2;
|
|
if (vs_sm_fill(sp, OOBLNO, P_TOP))
|
|
return (1);
|
|
return (vs_sm_position(sp, rp, 0, P_BOTTOM));
|
|
}
|
|
cursor_set = scmd == CNTRL_Y || vs_sm_cursor(sp, &ssmp);
|
|
for (; count &&
|
|
sp->t_rows != sp->t_maxrows; --count, ++sp->t_rows) {
|
|
if (HMAP->lno == 1 &&
|
|
(O_ISSET(sp, O_LEFTRIGHT) || HMAP->soff == 1))
|
|
break;
|
|
++TMAP;
|
|
if (vs_sm_1down(sp))
|
|
return (1);
|
|
}
|
|
if (!cursor_set) {
|
|
rp->lno = ssmp->lno;
|
|
rp->cno = ssmp->c_sboff;
|
|
}
|
|
if (count == 0)
|
|
return (0);
|
|
}
|
|
|
|
for (ychanged = zset = 0; count; --count) {
|
|
/* If the line doesn't exist, we're done. */
|
|
if (HMAP->lno == 1 &&
|
|
(O_ISSET(sp, O_LEFTRIGHT) || HMAP->soff == 1))
|
|
break;
|
|
|
|
/* Scroll the screen and cursor down one logical line. */
|
|
if (vs_sm_1down(sp))
|
|
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 positioned at
|
|
* the last line of the screen. However, the line may not
|
|
* exist.
|
|
*/
|
|
if (!count) {
|
|
for (smp = TMAP; smp > HMAP; --smp)
|
|
if (db_exist(sp, smp->lno))
|
|
break;
|
|
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 = vs_colpos(sp, smp->lno,
|
|
(O_ISSET(sp, O_LEFTRIGHT) ?
|
|
smp->coff : (smp->soff - 1) * sp->cols) +
|
|
sp->rcm % sp->cols);
|
|
}
|
|
return (0);
|
|
case Z_CARAT:
|
|
/* The z^ command moves the cursor to the first new line. */
|
|
break;
|
|
default:
|
|
abort();
|
|
}
|
|
|
|
if (!SMAP_CACHE(smp) && vs_line(sp, smp, NULL, NULL))
|
|
return (1);
|
|
rp->lno = smp->lno;
|
|
rp->cno = smp->c_scoff == 255 ? 0 : smp->c_sboff;
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* vs_sm_erase --
|
|
* Erase the small screen area for the scrolling functions.
|
|
*/
|
|
static int
|
|
vs_sm_erase(SCR *sp)
|
|
{
|
|
GS *gp;
|
|
|
|
gp = sp->gp;
|
|
(void)gp->scr_move(sp, LASTLINE(sp), 0);
|
|
(void)gp->scr_clrtoeol(sp);
|
|
for (; sp->t_rows > sp->t_minrows; --sp->t_rows, --TMAP) {
|
|
(void)gp->scr_move(sp, TMAP - HMAP, 0);
|
|
(void)gp->scr_clrtoeol(sp);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* vs_sm_1down --
|
|
* Scroll the SMAP down one.
|
|
*
|
|
* PUBLIC: int vs_sm_1down __P((SCR *));
|
|
*/
|
|
int
|
|
vs_sm_1down(SCR *sp)
|
|
{
|
|
/*
|
|
* Insert a line at the top of the screen. Shift the screen map
|
|
* down and display a new line at the top of the screen.
|
|
*/
|
|
(void)sp->gp->scr_move(sp, 0, 0);
|
|
if (vs_insertln(sp, 1))
|
|
return (1);
|
|
|
|
/* One-line screens can fail. */
|
|
if (IS_ONELINE(sp)) {
|
|
if (vs_sm_prev(sp, HMAP, HMAP))
|
|
return (1);
|
|
} else {
|
|
memmove(HMAP + 1, HMAP, (sp->rows - 1) * sizeof(SMAP));
|
|
if (vs_sm_prev(sp, HMAP + 1, HMAP))
|
|
return (1);
|
|
}
|
|
/* vs_sm_prev() flushed the cache. */
|
|
return (vs_line(sp, HMAP, NULL, NULL));
|
|
}
|
|
|
|
/*
|
|
* vs_insertln --
|
|
* Insert a line a la curses, make sure to put the information
|
|
* line and other screens back.
|
|
*/
|
|
static int
|
|
vs_insertln(SCR *sp, int cnt)
|
|
{
|
|
GS *gp;
|
|
size_t oldy, oldx;
|
|
|
|
gp = sp->gp;
|
|
|
|
/* If the screen is vertically split, we can't scroll it. */
|
|
if (IS_VSPLIT(sp)) {
|
|
F_SET(sp, SC_SCR_REDRAW);
|
|
return (0);
|
|
}
|
|
|
|
if (IS_ONELINE(sp)) {
|
|
(void)gp->scr_move(sp, LASTLINE(sp), 0);
|
|
(void)gp->scr_clrtoeol(sp);
|
|
} else {
|
|
(void)gp->scr_cursor(sp, &oldy, &oldx);
|
|
while (cnt--) {
|
|
(void)gp->scr_move(sp, LASTLINE(sp) - 1, 0);
|
|
(void)gp->scr_deleteln(sp);
|
|
(void)gp->scr_move(sp, oldy, oldx);
|
|
(void)gp->scr_insertln(sp);
|
|
}
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* vs_sm_next --
|
|
* Fill in the next entry in the SMAP.
|
|
*
|
|
* PUBLIC: int vs_sm_next __P((SCR *, SMAP *, SMAP *));
|
|
*/
|
|
int
|
|
vs_sm_next(SCR *sp, SMAP *p, SMAP *t)
|
|
{
|
|
size_t lcnt;
|
|
|
|
SMAP_FLUSH(t);
|
|
if (O_ISSET(sp, O_LEFTRIGHT)) {
|
|
t->lno = p->lno + 1;
|
|
t->coff = p->coff;
|
|
} else {
|
|
lcnt = vs_screens(sp, p->lno, NULL);
|
|
if (lcnt == p->soff) {
|
|
t->lno = p->lno + 1;
|
|
t->soff = 1;
|
|
} else {
|
|
t->lno = p->lno;
|
|
t->soff = p->soff + 1;
|
|
}
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* vs_sm_prev --
|
|
* Fill in the previous entry in the SMAP.
|
|
*
|
|
* PUBLIC: int vs_sm_prev __P((SCR *, SMAP *, SMAP *));
|
|
*/
|
|
int
|
|
vs_sm_prev(SCR *sp, SMAP *p, SMAP *t)
|
|
{
|
|
SMAP_FLUSH(t);
|
|
if (O_ISSET(sp, O_LEFTRIGHT)) {
|
|
t->lno = p->lno - 1;
|
|
t->coff = p->coff;
|
|
} else {
|
|
if (p->soff != 1) {
|
|
t->lno = p->lno;
|
|
t->soff = p->soff - 1;
|
|
} else {
|
|
t->lno = p->lno - 1;
|
|
t->soff = vs_screens(sp, t->lno, NULL);
|
|
}
|
|
}
|
|
return (t->lno == 0);
|
|
}
|
|
|
|
/*
|
|
* vs_sm_cursor --
|
|
* Return the SMAP entry referenced by the cursor.
|
|
*
|
|
* PUBLIC: int vs_sm_cursor __P((SCR *, SMAP **));
|
|
*/
|
|
int
|
|
vs_sm_cursor(SCR *sp, 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) && vs_line(sp, 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);
|
|
}
|
|
|
|
/*
|
|
* vs_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.
|
|
*
|
|
* PUBLIC: int vs_sm_position __P((SCR *, MARK *, u_long, pos_t));
|
|
*/
|
|
int
|
|
vs_sm_position(SCR *sp, MARK *rp, u_long cnt, pos_t 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 && !db_exist(sp, smp->lno)) {
|
|
sof: msgq(sp, M_BERR, "220|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 (!db_exist(sp, TMAP->lno)) {
|
|
if (db_last(sp, &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 (!db_exist(sp, smp->lno)) {
|
|
if (db_last(sp, &last))
|
|
return (1);
|
|
for (; smp->lno > last && smp > HMAP; --smp);
|
|
if (cnt > smp - HMAP) {
|
|
eof: msgq(sp, M_BERR,
|
|
"221|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) && vs_line(sp, smp, NULL, NULL))
|
|
return (1);
|
|
rp->lno = smp->lno;
|
|
rp->cno = smp->c_sboff;
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* vs_sm_nlines --
|
|
* Return the number of screen lines from an SMAP entry to the
|
|
* start of some file line, less than a maximum value.
|
|
*
|
|
* PUBLIC: recno_t vs_sm_nlines __P((SCR *, SMAP *, recno_t, size_t));
|
|
*/
|
|
recno_t
|
|
vs_sm_nlines(SCR *sp, 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->soff - 1);
|
|
|
|
if (from_sp->lno > to_lno) {
|
|
lcnt = from_sp->soff - 1; /* Correct for off-by-one. */
|
|
for (lno = from_sp->lno; --lno >= to_lno && lcnt <= max;)
|
|
lcnt += vs_screens(sp, lno, NULL);
|
|
} else {
|
|
lno = from_sp->lno;
|
|
lcnt = (vs_screens(sp, lno, NULL) - from_sp->soff) + 1;
|
|
for (; ++lno < to_lno && lcnt <= max;)
|
|
lcnt += vs_screens(sp, lno, NULL);
|
|
}
|
|
return (lcnt);
|
|
}
|