4.4BSD/usr/src/contrib/nvi/nvi/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 8.1 (Berkeley) 6/9/93";
#endif /* not lint */
#include <sys/types.h>
#include <errno.h>
#include <string.h>
#include "vi.h"
#include "recover.h"
/*
* UPDATE_SCREENS --
* Macro to walk the screens and update all of them that are backed
* by the file that just changed.
*/
#define UPDATE_SCREENS(op) { \
if (ep->refcnt == 1) { \
if (sp->s_change != NULL) \
sp->s_change(sp, ep, lno, op); \
} else { \
SCR *__tsp; \
for (__tsp = sp->gp->scrhdr.next; \
__tsp != (SCR *)&sp->gp->scrhdr; \
__tsp = __tsp->next) \
if (__tsp->ep == ep && \
__tsp->s_change != NULL) { \
sp->s_change(__tsp, ep, lno, op); \
sp->s_refresh(__tsp, ep); \
} \
} \
}
/*
* 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;
/*
* 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->txthdr, HDR_INUSE) &&
((TEXT *)sp->txthdr.next)->lno <= lno &&
((TEXT *)sp->txthdr.prev)->lno >= lno) {
for (tp = sp->txthdr.next; tp->lno != lno; tp = tp->next);
if (lenp)
*lenp = tp->len;
return (tp->lb);
}
if (F_ISSET(&sp->bhdr, HDR_INUSE) &&
((TEXT *)sp->bhdr.next)->lno <= lno &&
((TEXT *)sp->bhdr.prev)->lno >= lno) {
for (tp = sp->bhdr.next; tp->lno != lno; tp = tp->next);
if (lenp)
*lenp = tp->len;
return (tp->lb);
}
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 DEBUG && 0
TRACE(sp, "delete line %lu\n", lno);
#endif
/* 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. */
UPDATE_SCREENS(LINE_DELETE);
return (0);
}
/*
* 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;
#if DEBUG && 0
TRACE(sp, "append to %lu: len %u {%.*s}\n", lno, len, MIN(len, 20), p);
#endif
/* 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);
/*
* 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.
*/
if (update)
UPDATE_SCREENS(LINE_APPEND);
return (0);
}
/*
* 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;
#if DEBUG && 0
TRACE(sp,
"insert before %lu: len %u {%.*s}\n", lno, len, MIN(len, 20), p);
#endif
/* 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);
/* Update screen. */
UPDATE_SCREENS(LINE_INSERT);
return (0);
}
/*
* 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 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. */
UPDATE_SCREENS(LINE_RESET);
return (0);
}
/*
* 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->txthdr.prev)->lno > ep->c_nlines ?
((TEXT *)sp->txthdr.prev)->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->txthdr.prev)->lno > lno ?
((TEXT *)sp->txthdr.prev)->lno : lno);
return (0);
}