mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-22 11:17:19 +00:00
146 lines
3.7 KiB
C
146 lines
3.7 KiB
C
/*-
|
|
* Copyright (c) 1993, 1994
|
|
* The Regents of the University of California. All rights reserved.
|
|
* Copyright (c) 1993, 1994, 1995, 1996
|
|
* Keith Bostic. All rights reserved.
|
|
*
|
|
* See the LICENSE file for redistribution information.
|
|
*/
|
|
|
|
#include "config.h"
|
|
|
|
#ifndef lint
|
|
static const char sccsid[] = "$Id: ex_z.c,v 10.12 2001/06/25 15:19:22 skimo Exp $";
|
|
#endif /* not lint */
|
|
|
|
#include <sys/types.h>
|
|
#include <sys/queue.h>
|
|
#include <sys/time.h>
|
|
|
|
#include <bitstring.h>
|
|
#include <limits.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
|
|
#include "../common/common.h"
|
|
|
|
/*
|
|
* ex_z -- :[line] z [^-.+=] [count] [flags]
|
|
* Adjust window.
|
|
*
|
|
* PUBLIC: int ex_z(SCR *, EXCMD *);
|
|
*/
|
|
int
|
|
ex_z(SCR *sp, EXCMD *cmdp)
|
|
{
|
|
MARK abs;
|
|
recno_t cnt, equals, lno;
|
|
int eofcheck;
|
|
|
|
NEEDFILE(sp, cmdp);
|
|
|
|
/*
|
|
* !!!
|
|
* 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 (FL_ISSET(cmdp->iflags, E_C_COUNT))
|
|
cnt = cmdp->count;
|
|
else
|
|
cnt = O_VAL(sp, O_WINDOW) - 1;
|
|
|
|
equals = 0;
|
|
eofcheck = 0;
|
|
lno = cmdp->addr1.lno;
|
|
|
|
switch (FL_ISSET(cmdp->iflags,
|
|
E_C_CARAT | E_C_DASH | E_C_DOT | E_C_EQUAL | E_C_PLUS)) {
|
|
case E_C_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_C_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_C_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, ABSMARK1, &abs, 1);
|
|
break;
|
|
case E_C_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, cmdp))
|
|
return (1);
|
|
(void)ex_puts(sp, "----------------------------------------\n");
|
|
cmdp->addr2.lno = cmdp->addr1.lno = equals = lno;
|
|
if (ex_pr(sp, cmdp))
|
|
return (1);
|
|
(void)ex_puts(sp, "----------------------------------------\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_ADDR_DEF))
|
|
++lno;
|
|
/* FALLTHROUGH */
|
|
case E_C_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 (db_last(sp, &lno))
|
|
return (1);
|
|
if (cmdp->addr2.lno > lno)
|
|
cmdp->addr2.lno = lno;
|
|
}
|
|
|
|
if (ex_pr(sp, cmdp))
|
|
return (1);
|
|
if (equals)
|
|
sp->lno = equals;
|
|
return (0);
|
|
}
|