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/* $OpenBSD: ex_z.c,v 1.8 2015/03/29 01:04:23 bcallah Exp $ */ |
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/*- |
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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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#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(SCR *, EXCMD *); |
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*/ |
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int |
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ex_z(SCR *sp, EXCMD *cmdp) |
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{ |
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MARK 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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cnt = O_VAL(sp, O_WINDOW) - 1; |
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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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mark_abs.lno = sp->lno; |
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mark_abs.cno = sp->cno; |
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(void)mark_set(sp, ABSMARK1, &mark_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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} |