GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: usr.bin/vi/build/../ex/ex_z.c Lines: 0 50 0.0 %
Date: 2017-11-13 Branches: 0 36 0.0 %

Line Branch Exec Source
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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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}