[unix-history] / usr.bin / vi / line.c

/*-
 * Copyright (c) 1992, 1993
 *	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[] = "@(#)line.c	8.20 (Berkeley) 12/29/93";
#endif /* not lint */

#include <sys/types.h>

#include <errno.h>
#include <string.h>

#include "vi.h"
#include "excmd.h"

static inline int scr_update __P((SCR *, EXF *, recno_t, enum operation, int));

/*
 * file_gline --
 *	Look in the text buffers for a line; if it's not there
 *	call file_rline to retrieve it from the database.
 */
char *
file_gline(sp, ep, lno, lenp)
	SCR *sp;
	EXF *ep;
	recno_t lno;				/* Line number. */
	size_t *lenp;				/* Length store. */
{
	TEXT *tp;
	recno_t l1, l2;

	/*
	 * The underlying recno stuff handles zero by returning NULL, but
	 * have to have an oob condition for the look-aside into the input
	 * buffer anyway.
	 */
	if (lno == 0)
		return (NULL);

	/*
	 * Look-aside into the TEXT buffers and see if the line we want
	 * is there.
	 */
	if (F_ISSET(sp, S_INPUT)) {
		l1 = ((TEXT *)sp->tiq.cqh_first)->lno;
		l2 = ((TEXT *)sp->tiq.cqh_last)->lno;
		if (l1 <= lno && l2 >= lno) {
			for (tp = sp->tiq.cqh_first;
			    tp->lno != lno; tp = tp->q.cqe_next);
			if (lenp)
				*lenp = tp->len;
			return (tp->lb);
		}
		/*
		 * Adjust the line number for the number of lines used
		 * by the text input buffers.
		 */
		if (lno > l2)
			lno -= l2 - l1;
	}
	return (file_rline(sp, ep, lno, lenp));
}

/*
 * file_rline --
 *	Look in the cache for a line; if it's not there retrieve
 *	it from the file.
 */
char *
file_rline(sp, ep, lno, lenp)
	SCR *sp;
	EXF *ep;
	recno_t lno;				/* Line number. */
	size_t *lenp;				/* Length store. */
{
	DBT data, key;

	/* Check the cache. */
	if (lno == ep->c_lno) {
		if (lenp)
			*lenp = ep->c_len;
		return (ep->c_lp);
	}
	ep->c_lno = OOBLNO;

	/* Get the line from the underlying database. */
	key.data = &lno;
	key.size = sizeof(lno);
	switch (ep->db->get(ep->db, &key, &data, 0)) {
        case -1:
		msgq(sp, M_ERR,
		    "Error: %s/%d: unable to get line %u: %s.",
		    tail(__FILE__), __LINE__, lno, strerror(errno));
		/* FALLTHROUGH */
        case 1:
		return (NULL);
		/* NOTREACHED */
	}
	if (lenp)
		*lenp = data.size;

	/* Fill the cache. */
	ep->c_lno = lno;
	ep->c_len = data.size;
	ep->c_lp = data.data;

	return (data.data);
}

/*
 * file_dline --
 *	Delete a line from the file.
 */
int
file_dline(sp, ep, lno)
	SCR *sp;
	EXF *ep;
	recno_t lno;
{
	DBT key;

#if defined(DEBUG) && 0
	TRACE(sp, "delete line %lu\n", lno);
#endif
	/*
	 * XXX
	 *
	 * Marks and global commands have to know when lines are
	 * inserted or deleted.
	 */
	mark_insdel(sp, ep, LINE_DELETE, lno);
	global_insdel(sp, ep, LINE_DELETE, lno);

	/* Log change. */
	log_line(sp, ep, lno, LOG_LINE_DELETE);

	/* Update file. */
	key.data = &lno;
	key.size = sizeof(lno);
	if (ep->db->del(ep->db, &key, 0) == 1) {
		msgq(sp, M_ERR,
		    "Error: %s/%d: unable to delete line %u: %s.",
		    tail(__FILE__), __LINE__, lno, strerror(errno));
		return (1);
	}

	/* Flush the cache, update line count, before screen update. */
	if (lno <= ep->c_lno)
		ep->c_lno = OOBLNO;
	if (ep->c_nlines != OOBLNO)
		--ep->c_nlines;

	/* File now dirty. */
	if (F_ISSET(ep, F_FIRSTMODIFY))
		(void)rcv_init(sp, ep);
	F_SET(ep, F_MODIFIED);

	/* Update screen. */
	return (scr_update(sp, ep, lno, LINE_DELETE, 1));
}

/*
 * file_aline --
 *	Append a line into the file.
 */
int
file_aline(sp, ep, update, lno, p, len)
	SCR *sp;
	EXF *ep;
	int update;
	recno_t lno;
	char *p;
	size_t len;
{
	DBT data, key;
	recno_t lline;

#if defined(DEBUG) && 0
	TRACE(sp, "append to %lu: len %u {%.*s}\n", lno, len, MIN(len, 20), p);
#endif
	/*
	 * Very nasty special case.  The historic vi code displays a single
	 * space (or a '$' if the list option is set) for the first line in
	 * an "empty" file.  If we "insert" a line, that line gets scrolled
	 * down, not repainted, so it's incorrect when we refresh the the
	 * screen.  This is really hard to find and fix in the vi code -- the
	 * text input functions detect it explicitly and don't insert a new
	 * line.  The hack here is to repaint the screen if we're appending
	 * to an empty file.
	 */
	if (lno == 0) {
		if (file_lline(sp, ep, &lline))
			return (1);
		if (lline == 0)
			F_SET(sp, S_REDRAW);
	}

	/* Update file. */
	key.data = &lno;
	key.size = sizeof(lno);
	data.data = p;
	data.size = len;
	if (ep->db->put(ep->db, &key, &data, R_IAFTER) == -1) {
		msgq(sp, M_ERR,
		    "Error: %s/%d: unable to append to line %u: %s.",
		    tail(__FILE__), __LINE__, lno, strerror(errno));
		return (1);
	}

	/* Flush the cache, update line count, before screen update. */
	if (lno < ep->c_lno)
		ep->c_lno = OOBLNO;
	if (ep->c_nlines != OOBLNO)
		++ep->c_nlines;

	/* File now dirty. */
	if (F_ISSET(ep, F_FIRSTMODIFY))
		(void)rcv_init(sp, ep);
	F_SET(ep, F_MODIFIED);

	/* Log change. */
	log_line(sp, ep, lno + 1, LOG_LINE_APPEND);

	/*
	 * XXX
	 *
	 * Marks and global commands have to know when lines are
	 * inserted or deleted.
	 */
	mark_insdel(sp, ep, LINE_INSERT, lno + 1);
	global_insdel(sp, ep, LINE_INSERT, lno + 1);

	/*
	 * Update screen.
	 *
	 * XXX
	 * Nasty hack.  If multiple lines are input by the user, they aren't
	 * committed until an <ESC> is entered.  The problem is the screen was
	 * updated/scrolled as each line was entered.  So, when this routine
	 * is called to copy the new lines from the cut buffer into the file,
	 * it has to know not to update the screen again.
	 */ 
	return (scr_update(sp, ep, lno, LINE_APPEND, update));
}

/*
 * file_iline --
 *	Insert a line into the file.
 */
int
file_iline(sp, ep, lno, p, len)
	SCR *sp;
	EXF *ep;
	recno_t lno;
	char *p;
	size_t len;
{
	DBT data, key;
	recno_t lline;

#if defined(DEBUG) && 0
	TRACE(sp,
	    "insert before %lu: len %u {%.*s}\n", lno, len, MIN(len, 20), p);
#endif

	/* Very nasty special case.  See comment in file_aline(). */
	if (lno == 1) {
		if (file_lline(sp, ep, &lline))
			return (1);
		if (lline == 0)
			F_SET(sp, S_REDRAW);
	}

	/* Update file. */
	key.data = &lno;
	key.size = sizeof(lno);
	data.data = p;
	data.size = len;
	if (ep->db->put(ep->db, &key, &data, R_IBEFORE) == -1) {
		msgq(sp, M_ERR,
		    "Error: %s/%d: unable to insert at line %u: %s.",
		    tail(__FILE__), __LINE__, lno, strerror(errno));
		return (1);
	}

	/* Flush the cache, update line count, before screen update. */
	if (lno >= ep->c_lno)
		ep->c_lno = OOBLNO;
	if (ep->c_nlines != OOBLNO)
		++ep->c_nlines;

	/* File now dirty. */
	if (F_ISSET(ep, F_FIRSTMODIFY))
		(void)rcv_init(sp, ep);
	F_SET(ep, F_MODIFIED);

	/* Log change. */
	log_line(sp, ep, lno, LOG_LINE_INSERT);

	/*
	 * XXX
	 *
	 * Marks and global commands have to know when lines are
	 * inserted or deleted.
	 */
	mark_insdel(sp, ep, LINE_INSERT, lno);
	global_insdel(sp, ep, LINE_INSERT, lno);

	/* Update screen. */
	return (scr_update(sp, ep, lno, LINE_INSERT, 1));
}

/*
 * file_sline --
 *	Store a line in the file.
 */
int
file_sline(sp, ep, lno, p, len)
	SCR *sp;
	EXF *ep;
	recno_t lno;
	char *p;
	size_t len;
{
	DBT data, key;

#if defined(DEBUG) && 0
	TRACE(sp,
	    "replace line %lu: len %u {%.*s}\n", lno, len, MIN(len, 20), p);
#endif
	/* Log before change. */
	log_line(sp, ep, lno, LOG_LINE_RESET_B);

	/* Update file. */
	key.data = &lno;
	key.size = sizeof(lno);
	data.data = p;
	data.size = len;
	if (ep->db->put(ep->db, &key, &data, 0) == -1) {
		msgq(sp, M_ERR,
		    "Error: %s/%d: unable to store line %u: %s.",
		    tail(__FILE__), __LINE__, lno, strerror(errno));
		return (1);
	}

	/* Flush the cache, before logging or screen update. */
	if (lno == ep->c_lno)
		ep->c_lno = OOBLNO;

	/* File now dirty. */
	if (F_ISSET(ep, F_FIRSTMODIFY))
		(void)rcv_init(sp, ep);
	F_SET(ep, F_MODIFIED);

	/* Log after change. */
	log_line(sp, ep, lno, LOG_LINE_RESET_F);
	
	/* Update screen. */
	return (scr_update(sp, ep, lno, LINE_RESET, 1));
}

/*
 * file_lline --
 *	Return the number of lines in the file.
 */
int
file_lline(sp, ep, lnop)
	SCR *sp;
	EXF *ep;
	recno_t *lnop;
{
	DBT data, key;
	recno_t lno;

	/* Check the cache. */
	if (ep->c_nlines != OOBLNO) {
		*lnop = (F_ISSET(sp, S_INPUT) &&
		    ((TEXT *)sp->tiq.cqh_last)->lno > ep->c_nlines ?
		    ((TEXT *)sp->tiq.cqh_last)->lno : ep->c_nlines);
		return (0);
	}

	key.data = &lno;
	key.size = sizeof(lno);

	switch (ep->db->seq(ep->db, &key, &data, R_LAST)) {
        case -1:
		msgq(sp, M_ERR,
		    "Error: %s/%d: unable to get last line: %s.",
		    tail(__FILE__), __LINE__, strerror(errno));
		*lnop = 0;
		return (1);
        case 1:
		lno = 0;
		break;
	default:
		memmove(&lno, key.data, sizeof(lno));
		break;
	}

	/* Fill the cache. */
	ep->c_nlines = ep->c_lno = lno;
	ep->c_len = data.size;
	ep->c_lp = data.data;
 
	*lnop = (F_ISSET(sp, S_INPUT) &&
	    ((TEXT *)sp->tiq.cqh_last)->lno > lno ?
	    ((TEXT *)sp->tiq.cqh_last)->lno : lno);
	return (0);
}

/*
 * scr_update --
 *	Update all of the screens that are backed by the file that
 *	just changed.
 */
static inline int
scr_update(sp, ep, lno, op, current)
	SCR *sp;
	EXF *ep;
	recno_t lno;
	enum operation op;
	int current;
{
	SCR *tsp;

	if (ep->refcnt != 1)
		for (tsp = sp->gp->dq.cqh_first;
		    tsp != (void *)&sp->gp->dq; tsp = tsp->q.cqe_next)
			if (sp != tsp && tsp->ep == ep)
				(void)sp->s_change(tsp, ep, lno, op);
	return (current && sp->s_change(sp, ep, lno, op));
}
Commit	Line	Data
1e64b3ba JH	1	/*-
	2	* Copyright (c) 1992, 1993
	3	* The Regents of the University of California. All rights reserved.
	4	*
	5	* Redistribution and use in source and binary forms, with or without
	6	* modification, are permitted provided that the following conditions
	7	* are met:
	8	* 1. Redistributions of source code must retain the above copyright
	9	* notice, this list of conditions and the following disclaimer.
	10	* 2. Redistributions in binary form must reproduce the above copyright
	11	* notice, this list of conditions and the following disclaimer in the
	12	* documentation and/or other materials provided with the distribution.
	13	* 3. All advertising materials mentioning features or use of this software
	14	* must display the following acknowledgement:
	15	* This product includes software developed by the University of
	16	* California, Berkeley and its contributors.
	17	* 4. Neither the name of the University nor the names of its contributors
	18	* may be used to endorse or promote products derived from this software
	19	* without specific prior written permission.
	20	*
	21	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	22	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	23	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	24	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	25	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	26	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	27	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	28	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	29	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	30	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	31	* SUCH DAMAGE.
	32	*/
	33
	34	#ifndef lint
	35	static char sccsid[] = "@(#)line.c 8.20 (Berkeley) 12/29/93";
	36	#endif /* not lint */
	37
	38	#include <sys/types.h>
	39
	40	#include <errno.h>
	41	#include <string.h>
	42
	43	#include "vi.h"
	44	#include "excmd.h"
	45
	46	static inline int scr_update __P((SCR , EXF , recno_t, enum operation, int));
	47
	48	/*
	49	* file_gline --
	50	* Look in the text buffers for a line; if it's not there
	51	* call file_rline to retrieve it from the database.
	52	*/
	53	char *
	54	file_gline(sp, ep, lno, lenp)
	55	SCR *sp;
	56	EXF *ep;
	57	recno_t lno; /* Line number. */
	58	size_t lenp; / Length store. */
	59	{
	60	TEXT *tp;
	61	recno_t l1, l2;
	62
	63	/*
	64	* The underlying recno stuff handles zero by returning NULL, but
65	* have to have an oob condition for the look-aside into the input
66	* buffer anyway.
67	*/
68	if (lno == 0)
69	return (NULL);
70
71	/*
72	* Look-aside into the TEXT buffers and see if the line we want
73	* is there.
74	*/
75	if (F_ISSET(sp, S_INPUT)) {
76	l1 = ((TEXT *)sp->tiq.cqh_first)->lno;
77	l2 = ((TEXT *)sp->tiq.cqh_last)->lno;
78	if (l1 <= lno && l2 >= lno) {
79	for (tp = sp->tiq.cqh_first;
80	tp->lno != lno; tp = tp->q.cqe_next);
81	if (lenp)
82	*lenp = tp->len;
83	return (tp->lb);
84	}
85	/*
86	* Adjust the line number for the number of lines used
87	* by the text input buffers.
88	*/
89	if (lno > l2)
90	lno -= l2 - l1;
91	}
92	return (file_rline(sp, ep, lno, lenp));
93	}
94
95	/*
96	* file_rline --
97	* Look in the cache for a line; if it's not there retrieve
98	* it from the file.
99	*/
100	char *
101	file_rline(sp, ep, lno, lenp)
102	SCR *sp;
103	EXF *ep;
104	recno_t lno; /* Line number. */
105	size_t lenp; / Length store. */
106	{
107	DBT data, key;
108
109	/* Check the cache. */
110	if (lno == ep->c_lno) {
111	if (lenp)
112	*lenp = ep->c_len;
113	return (ep->c_lp);
114	}
115	ep->c_lno = OOBLNO;
116
117	/* Get the line from the underlying database. */
118	key.data = &lno;
119	key.size = sizeof(lno);
120	switch (ep->db->get(ep->db, &key, &data, 0)) {
121	case -1:
122	msgq(sp, M_ERR,
123	"Error: %s/%d: unable to get line %u: %s.",
124	tail(__FILE__), __LINE__, lno, strerror(errno));
125	/* FALLTHROUGH */
126	case 1:
127	return (NULL);
128	/* NOTREACHED */
129	}
130	if (lenp)
131	*lenp = data.size;
132
133	/* Fill the cache. */
134	ep->c_lno = lno;
135	ep->c_len = data.size;
136	ep->c_lp = data.data;
137
138	return (data.data);
139	}
140
141	/*
142	* file_dline --
143	* Delete a line from the file.
144	*/
145	int
146	file_dline(sp, ep, lno)
147	SCR *sp;
148	EXF *ep;
149	recno_t lno;
150	{
151	DBT key;
152
153	#if defined(DEBUG) && 0
154	TRACE(sp, "delete line %lu\n", lno);
155	#endif
156	/*
157	* XXX
158	*
159	* Marks and global commands have to know when lines are
160	* inserted or deleted.
161	*/
162	mark_insdel(sp, ep, LINE_DELETE, lno);
163	global_insdel(sp, ep, LINE_DELETE, lno);
164
165	/* Log change. */
166	log_line(sp, ep, lno, LOG_LINE_DELETE);
167
168	/* Update file. */
169	key.data = &lno;
170	key.size = sizeof(lno);
171	if (ep->db->del(ep->db, &key, 0) == 1) {
172	msgq(sp, M_ERR,
173	"Error: %s/%d: unable to delete line %u: %s.",
174	tail(__FILE__), __LINE__, lno, strerror(errno));
175	return (1);
176	}
177
178	/* Flush the cache, update line count, before screen update. */
179	if (lno <= ep->c_lno)
180	ep->c_lno = OOBLNO;
181	if (ep->c_nlines != OOBLNO)
182	--ep->c_nlines;
183
184	/* File now dirty. */
185	if (F_ISSET(ep, F_FIRSTMODIFY))
186	(void)rcv_init(sp, ep);
187	F_SET(ep, F_MODIFIED);
188
189	/* Update screen. */
190	return (scr_update(sp, ep, lno, LINE_DELETE, 1));
191	}
192
193	/*
194	* file_aline --
195	* Append a line into the file.
196	*/
197	int
198	file_aline(sp, ep, update, lno, p, len)
199	SCR *sp;
200	EXF *ep;
201	int update;
202	recno_t lno;
203	char *p;
204	size_t len;
205	{
206	DBT data, key;
207	recno_t lline;
208
209	#if defined(DEBUG) && 0
210	TRACE(sp, "append to %lu: len %u {%.*s}\n", lno, len, MIN(len, 20), p);
211	#endif
212	/*
213	* Very nasty special case. The historic vi code displays a single
214	* space (or a '$' if the list option is set) for the first line in
215	* an "empty" file. If we "insert" a line, that line gets scrolled
216	* down, not repainted, so it's incorrect when we refresh the the
217	* screen. This is really hard to find and fix in the vi code -- the
218	* text input functions detect it explicitly and don't insert a new
219	* line. The hack here is to repaint the screen if we're appending
220	* to an empty file.
221	*/
222	if (lno == 0) {
223	if (file_lline(sp, ep, &lline))
224	return (1);
225	if (lline == 0)
226	F_SET(sp, S_REDRAW);
227	}
228
229	/* Update file. */
230	key.data = &lno;
231	key.size = sizeof(lno);
232	data.data = p;
233	data.size = len;
234	if (ep->db->put(ep->db, &key, &data, R_IAFTER) == -1) {
235	msgq(sp, M_ERR,
236	"Error: %s/%d: unable to append to line %u: %s.",
237	tail(__FILE__), __LINE__, lno, strerror(errno));
238	return (1);
239	}
240
241	/* Flush the cache, update line count, before screen update. */
242	if (lno < ep->c_lno)
243	ep->c_lno = OOBLNO;
244	if (ep->c_nlines != OOBLNO)
245	++ep->c_nlines;
246
247	/* File now dirty. */
248	if (F_ISSET(ep, F_FIRSTMODIFY))
249	(void)rcv_init(sp, ep);
250	F_SET(ep, F_MODIFIED);
251
252	/* Log change. */
253	log_line(sp, ep, lno + 1, LOG_LINE_APPEND);
254
255	/*
256	* XXX
257	*
258	* Marks and global commands have to know when lines are
259	* inserted or deleted.
260	*/
261	mark_insdel(sp, ep, LINE_INSERT, lno + 1);
262	global_insdel(sp, ep, LINE_INSERT, lno + 1);
263
264	/*
265	* Update screen.
266	*
267	* XXX
268	* Nasty hack. If multiple lines are input by the user, they aren't
269	* committed until an <ESC> is entered. The problem is the screen was
270	* updated/scrolled as each line was entered. So, when this routine
271	* is called to copy the new lines from the cut buffer into the file,
272	* it has to know not to update the screen again.
273	*/
274	return (scr_update(sp, ep, lno, LINE_APPEND, update));
275	}
276
277	/*
278	* file_iline --
279	* Insert a line into the file.
280	*/
281	int
282	file_iline(sp, ep, lno, p, len)
283	SCR *sp;
284	EXF *ep;
285	recno_t lno;
286	char *p;
287	size_t len;
288	{
289	DBT data, key;
290	recno_t lline;
291
292	#if defined(DEBUG) && 0
293	TRACE(sp,
294	"insert before %lu: len %u {%.*s}\n", lno, len, MIN(len, 20), p);
295	#endif
296
297	/* Very nasty special case. See comment in file_aline(). */
298	if (lno == 1) {
299	if (file_lline(sp, ep, &lline))
300	return (1);
301	if (lline == 0)
302	F_SET(sp, S_REDRAW);
303	}
304
305	/* Update file. */
306	key.data = &lno;
307	key.size = sizeof(lno);
308	data.data = p;
309	data.size = len;
310	if (ep->db->put(ep->db, &key, &data, R_IBEFORE) == -1) {
311	msgq(sp, M_ERR,
312	"Error: %s/%d: unable to insert at line %u: %s.",
313	tail(__FILE__), __LINE__, lno, strerror(errno));
314	return (1);
315	}
316
317	/* Flush the cache, update line count, before screen update. */
318	if (lno >= ep->c_lno)
319	ep->c_lno = OOBLNO;
320	if (ep->c_nlines != OOBLNO)
321	++ep->c_nlines;
322
323	/* File now dirty. */
324	if (F_ISSET(ep, F_FIRSTMODIFY))
325	(void)rcv_init(sp, ep);
326	F_SET(ep, F_MODIFIED);
327
328	/* Log change. */
329	log_line(sp, ep, lno, LOG_LINE_INSERT);
330
331	/*
332	* XXX
333	*
334	* Marks and global commands have to know when lines are
335	* inserted or deleted.
336	*/
337	mark_insdel(sp, ep, LINE_INSERT, lno);
338	global_insdel(sp, ep, LINE_INSERT, lno);
339
340	/* Update screen. */
341	return (scr_update(sp, ep, lno, LINE_INSERT, 1));
342	}
343
344	/*
345	* file_sline --
346	* Store a line in the file.
347	*/
348	int
349	file_sline(sp, ep, lno, p, len)
350	SCR *sp;
351	EXF *ep;
352	recno_t lno;
353	char *p;
354	size_t len;
355	{
356	DBT data, key;
357
358	#if defined(DEBUG) && 0
359	TRACE(sp,
360	"replace line %lu: len %u {%.*s}\n", lno, len, MIN(len, 20), p);
361	#endif
362	/* Log before change. */
363	log_line(sp, ep, lno, LOG_LINE_RESET_B);
364
365	/* Update file. */
366	key.data = &lno;
367	key.size = sizeof(lno);
368	data.data = p;
369	data.size = len;
370	if (ep->db->put(ep->db, &key, &data, 0) == -1) {
371	msgq(sp, M_ERR,
372	"Error: %s/%d: unable to store line %u: %s.",
373	tail(__FILE__), __LINE__, lno, strerror(errno));
374	return (1);
375	}
376
377	/* Flush the cache, before logging or screen update. */
378	if (lno == ep->c_lno)
379	ep->c_lno = OOBLNO;
380
381	/* File now dirty. */
382	if (F_ISSET(ep, F_FIRSTMODIFY))
383	(void)rcv_init(sp, ep);
384	F_SET(ep, F_MODIFIED);
385
386	/* Log after change. */
387	log_line(sp, ep, lno, LOG_LINE_RESET_F);
388
389	/* Update screen. */
390	return (scr_update(sp, ep, lno, LINE_RESET, 1));
391	}
392
393	/*
394	* file_lline --
395	* Return the number of lines in the file.
396	*/
397	int
398	file_lline(sp, ep, lnop)
399	SCR *sp;
400	EXF *ep;
401	recno_t *lnop;
402	{
403	DBT data, key;
404	recno_t lno;
405
406	/* Check the cache. */
407	if (ep->c_nlines != OOBLNO) {
408	*lnop = (F_ISSET(sp, S_INPUT) &&
409	((TEXT *)sp->tiq.cqh_last)->lno > ep->c_nlines ?
410	((TEXT *)sp->tiq.cqh_last)->lno : ep->c_nlines);
411	return (0);
412	}
413
414	key.data = &lno;
415	key.size = sizeof(lno);
416
417	switch (ep->db->seq(ep->db, &key, &data, R_LAST)) {
418	case -1:
419	msgq(sp, M_ERR,
420	"Error: %s/%d: unable to get last line: %s.",
421	tail(__FILE__), __LINE__, strerror(errno));
422	*lnop = 0;
423	return (1);
424	case 1:
425	lno = 0;
426	break;
427	default:
428	memmove(&lno, key.data, sizeof(lno));
429	break;
430	}
431
432	/* Fill the cache. */
433	ep->c_nlines = ep->c_lno = lno;
434	ep->c_len = data.size;
435	ep->c_lp = data.data;
436
437	*lnop = (F_ISSET(sp, S_INPUT) &&
438	((TEXT *)sp->tiq.cqh_last)->lno > lno ?
439	((TEXT *)sp->tiq.cqh_last)->lno : lno);
440	return (0);
441	}
442
443	/*
444	* scr_update --
445	* Update all of the screens that are backed by the file that
446	* just changed.
447	*/
448	static inline int
449	scr_update(sp, ep, lno, op, current)
450	SCR *sp;
451	EXF *ep;
452	recno_t lno;
453	enum operation op;
454	int current;
455	{
456	SCR *tsp;
457
458	if (ep->refcnt != 1)
459	for (tsp = sp->gp->dq.cqh_first;
460	tsp != (void *)&sp->gp->dq; tsp = tsp->q.cqe_next)
461	if (sp != tsp && tsp->ep == ep)
462	(void)sp->s_change(tsp, ep, lno, op);
463	return (current && sp->s_change(sp, ep, lno, op));
464	}