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/*-
* Copyright (c) 1993, 1994
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef lint
static char sccsid[] = "@(#)ex_z.c 8.8 (Berkeley) 8/17/94";
#endif /* not lint */
#include <sys/types.h>
#include <sys/queue.h>
#include <sys/time.h>
#include <bitstring.h>
#include <limits.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <termios.h>
#include "compat.h"
#include <db.h>
#include <regex.h>
#include "vi.h"
#include "excmd.h"
/*
* ex_z -- :[line] z [^-.+=] [count] [flags]
*
* Adjust window.
*/
int
ex_z(sp, ep, cmdp)
SCR *sp;
EXF *ep;
EXCMDARG *cmdp;
{
MARK abs;
recno_t cnt, equals, lno;
int eofcheck;
/*
* !!!
* If no count specified, use either two times the size of the
* scrolling region, or the size of the window option. POSIX
* 1003.2 claims that the latter is correct, but historic ex/vi
* documentation and practice appear to use the scrolling region.
* I'm using the window size as it means that the entire screen
* is used instead of losing a line to roundoff. Note, we drop
* a line from the cnt if using the window size to leave room for
* the next ex prompt.
*/
if (F_ISSET(cmdp, E_COUNT))
cnt = cmdp->count;
else
#ifdef HISTORIC_PRACTICE
cnt = O_VAL(sp, O_SCROLL) * 2;
#else
cnt = O_VAL(sp, O_WINDOW) - 1;
#endif
equals = 0;
eofcheck = 0;
lno = cmdp->addr1.lno;
switch (F_ISSET(cmdp,
E_F_CARAT | E_F_DASH | E_F_DOT | E_F_EQUAL | E_F_PLUS)) {
case E_F_CARAT: /* Display cnt * 2 before the line. */
eofcheck = 1;
if (lno > cnt * 2)
cmdp->addr1.lno = (lno - cnt * 2) + 1;
else
cmdp->addr1.lno = 1;
cmdp->addr2.lno = (cmdp->addr1.lno + cnt) - 1;
break;
case E_F_DASH: /* Line goes at the bottom of the screen. */
cmdp->addr1.lno = lno > cnt ? (lno - cnt) + 1 : 1;
cmdp->addr2.lno = lno;
break;
case E_F_DOT: /* Line goes in the middle of the screen. */
/*
* !!!
* Historically, the "middleness" of the line overrode the
* count, so that "3z.19" or "3z.20" would display the first
* 12 lines of the file, i.e. (N - 1) / 2 lines before and
* after the specified line.
*/
eofcheck = 1;
cnt = (cnt - 1) / 2;
cmdp->addr1.lno = lno > cnt ? lno - cnt : 1;
cmdp->addr2.lno = lno + cnt;
/*
* !!!
* Historically, z. set the absolute cursor mark.
*/
abs.lno = sp->lno;
abs.cno = sp->cno;
(void)mark_set(sp, ep, ABSMARK1, &abs, 1);
break;
case E_F_EQUAL: /* Center with hyphens. */
/*
* !!!
* Strangeness. The '=' flag is like the '.' flag (see the
* above comment, it applies here as well) but with a special
* little hack. Print out lines of hyphens before and after
* the specified line. Additionally, the cursor remains set
* on that line.
*/
eofcheck = 1;
cnt = (cnt - 1) / 2;
cmdp->addr1.lno = lno > cnt ? lno - cnt : 1;
cmdp->addr2.lno = lno - 1;
if (ex_pr(sp, ep, cmdp))
return (1);
(void)ex_printf(EXCOOKIE,
"%s", "----------------------------------------\n");
cmdp->addr2.lno = cmdp->addr1.lno = equals = lno;
if (ex_pr(sp, ep, cmdp))
return (1);
(void)ex_printf(EXCOOKIE,
"%s", "----------------------------------------\n");
cmdp->addr1.lno = lno + 1;
cmdp->addr2.lno = (lno + cnt) - 1;
break;
default:
/* If no line specified, move to the next one. */
if (F_ISSET(cmdp, E_ADDRDEF))
++lno;
/* FALLTHROUGH */
case E_F_PLUS: /* Line goes at the top of the screen. */
eofcheck = 1;
cmdp->addr1.lno = lno;
cmdp->addr2.lno = (lno + cnt) - 1;
break;
}
if (eofcheck) {
if (file_lline(sp, ep, &lno))
return (1);
if (cmdp->addr2.lno > lno)
cmdp->addr2.lno = lno;
}
if (ex_pr(sp, ep, cmdp))
return (1);
if (equals)
sp->lno = equals;
return (0);
}
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