minix/external/bsd/nvi/dist/vi/v_delete.c

/*	$NetBSD: v_delete.c,v 1.2 2013/11/22 15:52:06 christos Exp $	*/
/*-
 * Copyright (c) 1992, 1993, 1994
 *	The Regents of the University of California.  All rights reserved.
 * Copyright (c) 1992, 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: v_delete.c,v 10.11 2001/06/25 15:19:31 skimo Exp  (Berkeley) Date: 2001/06/25 15:19:31 ";
#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 "../common/common.h"
#include "vi.h"

/*
 * v_delete -- [buffer][count]d[count]motion
 *	       [buffer][count]D
 *	Delete a range of text.
 *
 * PUBLIC: int v_delete __P((SCR *, VICMD *));
 */
int
v_delete(SCR *sp, VICMD *vp)
{
	db_recno_t nlines;
	size_t len;
	int lmode;

	lmode = F_ISSET(vp, VM_LMODE) ? CUT_LINEMODE : 0;

	/* Yank the lines. */
	if (cut(sp, F_ISSET(vp, VC_BUFFER) ? &vp->buffer : NULL,
	    &vp->m_start, &vp->m_stop,
	    lmode | (F_ISSET(vp, VM_CUTREQ) ? CUT_NUMREQ : CUT_NUMOPT)))
		return (1);

	/* Delete the lines. */
	if (del(sp, &vp->m_start, &vp->m_stop, lmode))
		return (1);

	/*
	 * Check for deletion of the entire file.  Try to check a close
	 * by line so we don't go to the end of the file unnecessarily.
	 */
	if (!db_exist(sp, vp->m_final.lno + 1)) {
		if (db_last(sp, &nlines))
			return (1);
		if (nlines == 0) {
			vp->m_final.lno = 1;
			vp->m_final.cno = 0;
			return (0);
		}
	}

	/*
	 * One special correction, in case we've deleted the current line or
	 * character.  We check it here instead of checking in every command
	 * that can be a motion component.
	 */
	if (db_get(sp, vp->m_final.lno, 0, NULL, &len)) {
		if (db_get(sp, nlines, DBG_FATAL, NULL, &len))
			return (1);
		vp->m_final.lno = nlines;
	}

	/*
	 * !!!
	 * Cursor movements, other than those caused by a line mode command
	 * moving to another line, historically reset the relative position.
	 *
	 * This currently matches the check made in v_yank(), I'm hoping that
	 * they should be consistent...
	 */  
	if (!F_ISSET(vp, VM_LMODE)) {
		F_CLR(vp, VM_RCM_MASK);
		F_SET(vp, VM_RCM_SET);

		/* Make sure the set cursor position exists. */
		if (vp->m_final.cno >= len)
			vp->m_final.cno = len ? len - 1 : 0;
	}

	/*
	 * !!!
	 * The "dd" command moved to the first non-blank; "d<motion>"
	 * didn't.
	 */
	if (F_ISSET(vp, VM_LDOUBLE)) {
		F_CLR(vp, VM_RCM_MASK);
		F_SET(vp, VM_RCM_SETFNB);
	}
	return (0);
}