v_text.c

早期freebsd实现

/*-
 * Copyright (c) 1992, 1993, 1994
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifndef lint
static char sccsid[] = "@(#)v_text.c	8.33 (Berkeley) 4/13/94";
#endif /* not lint */

#include <sys/types.h>
#include <sys/queue.h>
#include <sys/time.h>

#include <bitstring.h>
#include <ctype.h>
#include <errno.h>
#include <limits.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <termios.h>

#include "compat.h"
#include <db.h>
#include <regex.h>

#include "vi.h"
#include "vcmd.h"

/*
 * !!!
 * Repeated input in the historic vi is mostly wrong and this isn't very
 * backward compatible.  For example, if the user entered "3Aab\ncd" in
 * the historic vi, the "ab" was repeated 3 times, and the "\ncd" was then
 * appended to the result.  There was also a hack which I don't remember
 * right now, where "3o" would open 3 lines and then let the user fill them
 * in, to make screen movements on 300 baud modems more tolerable.  I don't
 * think it's going to be missed.
 *
 * !!!
 * There's a problem with the way that we do logging for change commands with
 * implied motions (e.g. A, I, O, cc, etc.).  Since the main vi loop logs the
 * starting cursor position before the change command "moves" the cursor, the
 * cursor position to which we return on undo will be where the user entered
 * the change command, not the start of the change.  Several of the following
 * routines re-log the cursor to make this work correctly.  Historic vi tried
 * to do the same thing, and mostly got it right.  (The only spectacular way
 * it fails is if the user entered 'o' from anywhere but the last character of
 * the line, the undo returned the cursor to the start of the line.  If the
 * user was on the last character of the line, the cursor returned to that
 * position.)  We also check for mapped keys waiting, i.e. if we're in the
 * middle of a map, don't bother logging the cursor.
 */
#define	LOG_CORRECT {							\
	if (!MAPPED_KEYS_WAITING(sp))					\
		(void)log_cursor(sp, ep);				\
}
#define	LOG_CORRECT_FIRST {						\
	if (first == 1) {						\
		LOG_CORRECT;						\
		first = 0;						\
	}								\
}

static u_int	set_txt_std __P((SCR *, VICMDARG *, u_int));
static int	v_CS __P((SCR *, EXF *, VICMDARG *, u_int));

/*
 * v_iA -- [count]A
 *	Append text to the end of the line.
 */
int
v_iA(sp, ep, vp)
	SCR *sp;
	EXF *ep;
	VICMDARG *vp;
{
	recno_t lno;
	u_long cnt;
	size_t len;
	u_int flags;
	int first;
	char *p;

	flags = set_txt_std(sp, vp, TXT_APPENDEOL);
	for (first = 1, lno = vp->m_start.lno,
	    cnt = F_ISSET(vp, VC_C1SET) ? vp->count : 1; cnt--;) {
		/* Move the cursor to the end of the line + 1. */
		if ((p = file_gline(sp, ep, lno, &len)) == NULL) {
			if (file_lline(sp, ep, &lno))
				return (1);
			if (lno != 0) {
				GETLINE_ERR(sp, lno);
				return (1);
			}
			lno = 1;
			len = 0;
		} else {
			/* Correct logging for implied cursor motion. */
			if (first == 1) {
				sp->cno = len == 0 ? 0 : len - 1;
				LOG_CORRECT;
				first = 0;
			}

			/* Start the change after the line. */
			sp->cno = len;
		}

		if (v_ntext(sp, ep,
		    sp->tiqp, NULL, p, len, &vp->m_final, 0, OOBLNO, flags))
			return (1);

		flags = set_txt_std(sp, vp, TXT_APPENDEOL | TXT_REPLAY);
		sp->lno = lno = vp->m_final.lno;
		sp->cno = vp->m_final.cno;

		if (F_ISSET(sp, S_INTERRUPTED))
			break;
	}
	return (0);
}

/*
 * v_ia -- [count]a
 *	Append text to the cursor position.
 */
int
v_ia(sp, ep, vp)
	SCR *sp;
	EXF *ep;
	VICMDARG *vp;
{
	recno_t lno;
	u_long cnt;
	u_int flags;
	size_t len;
	char *p;

	flags = set_txt_std(sp, vp, 0);
	for (lno = vp->m_start.lno,
	    cnt = F_ISSET(vp, VC_C1SET) ? vp->count : 1; cnt--;) {
		/*
		 * Move the cursor one column to the right and
		 * repaint the screen.
		 */
		if ((p = file_gline(sp, ep, lno, &len)) == NULL) {
			if (file_lline(sp, ep, &lno))
				return (1);
			if (lno != 0) {
				GETLINE_ERR(sp, lno);
				return (1);
			}
			lno = 1;
			len = 0;
			LF_SET(TXT_APPENDEOL);
		} else if (len) {
			if (len == sp->cno + 1) {
				sp->cno = len;
				LF_SET(TXT_APPENDEOL);
			} else
				++sp->cno;
		} else
			LF_SET(TXT_APPENDEOL);

		if (v_ntext(sp, ep,
		    sp->tiqp, NULL, p, len, &vp->m_final, 0, OOBLNO, flags))
			return (1);

		flags = set_txt_std(sp, vp, TXT_REPLAY);
		sp->lno = lno = vp->m_final.lno;
		sp->cno = vp->m_final.cno;

		if (F_ISSET(sp, S_INTERRUPTED))
			break;
	}
	return (0);
}

/*
 * v_iI -- [count]I
 *	Insert text at the first non-blank character in the line.
 */
int
v_iI(sp, ep, vp)
	SCR *sp;
	EXF *ep;
	VICMDARG *vp;
{
	recno_t lno;
	u_long cnt;
	size_t len;
	u_int flags;
	int first;
	char *p;

	flags = set_txt_std(sp, vp, 0);
	for (first = 1, lno = vp->m_start.lno,
	    cnt = F_ISSET(vp, VC_C1SET) ? vp->count : 1; cnt--;) {
		/*
		 * Move the cursor to the start of the line and repaint
		 * the screen.
		 */
		if ((p = file_gline(sp, ep, lno, &len)) == NULL) {
			if (file_lline(sp, ep, &lno))
				return (1);
			if (lno != 0) {
				GETLINE_ERR(sp, lno);
				return (1);
			}
			lno = 1;
			len = 0;
		} else {
			sp->cno = 0;
			if (nonblank(sp, ep, lno, &sp->cno))
				return (1);

			/* Correct logging for implied cursor motion. */
			LOG_CORRECT_FIRST;
		}
		if (len == 0)
			LF_SET(TXT_APPENDEOL);

		if (v_ntext(sp, ep,
		    sp->tiqp, NULL, p, len, &vp->m_final, 0, OOBLNO, flags))
			return (1);

		flags = set_txt_std(sp, vp, TXT_REPLAY);
		sp->lno = lno = vp->m_final.lno;
		sp->cno = vp->m_final.cno;

		if (F_ISSET(sp, S_INTERRUPTED))
			break;
	}
	return (0);
}

/*
 * v_ii -- [count]i
 *	Insert text at the cursor position.
 */
int
v_ii(sp, ep, vp)
	SCR *sp;
	EXF *ep;
	VICMDARG *vp;
{
	recno_t lno;
	u_long cnt;
	size_t len;
	u_int flags;
	char *p;

	flags = set_txt_std(sp, vp, 0);
	for (lno = vp->m_start.lno,
	    cnt = F_ISSET(vp, VC_C1SET) ? vp->count : 1; cnt--;) {
		if ((p = file_gline(sp, ep, lno, &len)) == NULL) {
			if (file_lline(sp, ep, &lno))
				return (1);
			if (lno != 0) {
				GETLINE_ERR(sp, vp->m_start.lno);
				return (1);
			}
			lno = 1;
			len = 0;
		}
		/* If len == sp->cno, it's a replay caused by a count. */
		if (len == 0 || len == sp->cno)
			LF_SET(TXT_APPENDEOL);

		if (v_ntext(sp, ep,
		    sp->tiqp, NULL, p, len, &vp->m_final, 0, OOBLNO, flags))
			return (1);

		/*
		 * On replay, if the line isn't empty, advance the insert
		 * by one (make it an append).
		 */
		flags = set_txt_std(sp, vp, TXT_REPLAY);
		sp->lno = lno = vp->m_final.lno;
		if ((sp->cno = vp->m_final.cno) != 0)
			++sp->cno;

		if (F_ISSET(sp, S_INTERRUPTED))
			break;
	}
	return (0);
}

/*
 * v_iO -- [count]O
 *	Insert text above this line.
 */
int
v_iO(sp, ep, vp)
	SCR *sp;
	EXF *ep;
	VICMDARG *vp;
{
	recno_t ai_line, lno;
	size_t len;
	u_long cnt;
	u_int flags;
	int first;
	char *p;

	flags = set_txt_std(sp, vp, TXT_APPENDEOL);
	for (first = 1, cnt = F_ISSET(vp, VC_C1SET) ? vp->count : 1; cnt--;) {
		if (sp->lno == 1) {
			if (file_lline(sp, ep, &lno))
				return (1);
			if (lno != 0)
				goto insert;
			p = NULL;
			len = 0;
			ai_line = OOBLNO;
		} else {
insert:			p = "";
			sp->cno = 0;

			/* Correct logging for implied cursor motion. */
			LOG_CORRECT_FIRST;

			if (file_iline(sp, ep, sp->lno, p, 0))
				return (1);
			if ((p = file_gline(sp, ep, sp->lno, &len)) == NULL) {
				GETLINE_ERR(sp, sp->lno);
				return (1);
			}
			ai_line = sp->lno + 1;
		}

		if (v_ntext(sp, ep,
		    sp->tiqp, NULL, p, len, &vp->m_final, 0, ai_line, flags))
			return (1);

		flags = set_txt_std(sp, vp, TXT_APPENDEOL | TXT_REPLAY);
		sp->lno = lno = vp->m_final.lno;
		sp->cno = vp->m_final.cno;

		if (F_ISSET(sp, S_INTERRUPTED))
			break;
	}
	return (0);
}

/*
 * v_io -- [count]o
 *	Insert text after this line.
 */
int
v_io(sp, ep, vp)
	SCR *sp;
	EXF *ep;
	VICMDARG *vp;
{
	recno_t ai_line, lno;
	size_t len;
	u_long cnt;
	u_int flags;
	int first;
	char *p;

	flags = set_txt_std(sp, vp, TXT_APPENDEOL);
	for (first = 1,
	    cnt = F_ISSET(vp, VC_C1SET) ? vp->count : 1; cnt--;) {
		if (sp->lno == 1) {
			if (file_lline(sp, ep, &lno))
				return (1);
			if (lno != 0)
				goto insert;
			p = NULL;
			len = 0;
			ai_line = OOBLNO;
		} else {
insert:			p = "";
			sp->cno = 0;

			/* Correct logging for implied cursor motion. */
			LOG_CORRECT_FIRST;

			len = 0;
			if (file_aline(sp, ep, 1, sp->lno, p, len))
				return (1);
			if ((p = file_gline(sp, ep, ++sp->lno, &len)) == NULL) {
				GETLINE_ERR(sp, sp->lno);
				return (1);
			}
			ai_line = sp->lno - 1;
		}

		if (v_ntext(sp, ep,
		    sp->tiqp, NULL, p, len, &vp->m_final, 0, ai_line, flags))
			return (1);

		flags = set_txt_std(sp, vp, TXT_APPENDEOL | TXT_REPLAY);
		sp->lno = lno = vp->m_final.lno;
		sp->cno = vp->m_final.cno;

		if (F_ISSET(sp, S_INTERRUPTED))
			break;
	}
	return (0);
}

/*
 * v_Change -- [buffer][count]C