b8ba871bd9
files, curses, db, regex etc that we already have). The other glue will follow shortly. Obtained from: Keith Bostic <bostic@bostic.com>
151 lines
3.7 KiB
C
151 lines
3.7 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[] = "@(#)ex_z.c 10.10 (Berkeley) 3/6/96";
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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 <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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/*
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* ex_z -- :[line] z [^-.+=] [count] [flags]
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* Adjust window.
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*
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* PUBLIC: int ex_z __P((SCR *, EXCMD *));
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*/
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int
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ex_z(sp, cmdp)
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SCR *sp;
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EXCMD *cmdp;
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{
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MARK abs;
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recno_t cnt, equals, lno;
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int eofcheck;
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NEEDFILE(sp, cmdp);
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/*
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* !!!
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* If no count specified, use either two times the size of the
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* scrolling region, or the size of the window option. POSIX
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* 1003.2 claims that the latter is correct, but historic ex/vi
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* documentation and practice appear to use the scrolling region.
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* I'm using the window size as it means that the entire screen
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* is used instead of losing a line to roundoff. Note, we drop
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* a line from the cnt if using the window size to leave room for
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* the next ex prompt.
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*/
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if (FL_ISSET(cmdp->iflags, E_C_COUNT))
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cnt = cmdp->count;
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else
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#ifdef HISTORIC_PRACTICE
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cnt = O_VAL(sp, O_SCROLL) * 2;
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#else
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cnt = O_VAL(sp, O_WINDOW) - 1;
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#endif
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equals = 0;
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eofcheck = 0;
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lno = cmdp->addr1.lno;
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switch (FL_ISSET(cmdp->iflags,
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E_C_CARAT | E_C_DASH | E_C_DOT | E_C_EQUAL | E_C_PLUS)) {
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case E_C_CARAT: /* Display cnt * 2 before the line. */
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eofcheck = 1;
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if (lno > cnt * 2)
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cmdp->addr1.lno = (lno - cnt * 2) + 1;
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else
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cmdp->addr1.lno = 1;
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cmdp->addr2.lno = (cmdp->addr1.lno + cnt) - 1;
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break;
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case E_C_DASH: /* Line goes at the bottom of the screen. */
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cmdp->addr1.lno = lno > cnt ? (lno - cnt) + 1 : 1;
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cmdp->addr2.lno = lno;
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break;
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case E_C_DOT: /* Line goes in the middle of the screen. */
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/*
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* !!!
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* Historically, the "middleness" of the line overrode the
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* count, so that "3z.19" or "3z.20" would display the first
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* 12 lines of the file, i.e. (N - 1) / 2 lines before and
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* after the specified line.
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*/
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eofcheck = 1;
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cnt = (cnt - 1) / 2;
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cmdp->addr1.lno = lno > cnt ? lno - cnt : 1;
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cmdp->addr2.lno = lno + cnt;
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/*
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* !!!
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* Historically, z. set the absolute cursor mark.
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*/
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abs.lno = sp->lno;
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abs.cno = sp->cno;
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(void)mark_set(sp, ABSMARK1, &abs, 1);
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break;
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case E_C_EQUAL: /* Center with hyphens. */
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/*
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* !!!
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* Strangeness. The '=' flag is like the '.' flag (see the
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* above comment, it applies here as well) but with a special
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* little hack. Print out lines of hyphens before and after
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* the specified line. Additionally, the cursor remains set
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* on that line.
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*/
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eofcheck = 1;
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cnt = (cnt - 1) / 2;
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cmdp->addr1.lno = lno > cnt ? lno - cnt : 1;
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cmdp->addr2.lno = lno - 1;
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if (ex_pr(sp, cmdp))
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return (1);
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(void)ex_puts(sp, "----------------------------------------\n");
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cmdp->addr2.lno = cmdp->addr1.lno = equals = lno;
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if (ex_pr(sp, cmdp))
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return (1);
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(void)ex_puts(sp, "----------------------------------------\n");
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cmdp->addr1.lno = lno + 1;
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cmdp->addr2.lno = (lno + cnt) - 1;
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break;
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default:
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/* If no line specified, move to the next one. */
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if (F_ISSET(cmdp, E_ADDR_DEF))
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++lno;
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/* FALLTHROUGH */
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case E_C_PLUS: /* Line goes at the top of the screen. */
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eofcheck = 1;
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cmdp->addr1.lno = lno;
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cmdp->addr2.lno = (lno + cnt) - 1;
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break;
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}
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if (eofcheck) {
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if (db_last(sp, &lno))
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return (1);
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if (cmdp->addr2.lno > lno)
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cmdp->addr2.lno = lno;
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}
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if (ex_pr(sp, cmdp))
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return (1);
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if (equals)
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sp->lno = equals;
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return (0);
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}
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