/*-
* 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: line.c,v 10.26 2011/08/12 12:36:41 zy Exp $";
#endif /* not lint */
#include <sys/types.h>
#include <sys/queue.h>
#include <sys/time.h>
#include <bitstring.h>
#include <errno.h>
#include <limits.h>
#include <stdio.h>
#include <string.h>
#include "common.h"
#include "../vi/vi.h"
static int scr_update __P((SCR *, recno_t, lnop_t, int));
/*
* db_eget --
* Front-end to db_get, special case handling for empty files.
*
* PUBLIC: int db_eget __P((SCR *, recno_t, CHAR_T **, size_t *, int *));
*/
int
db_eget(
SCR *sp,
recno_t lno, /* Line number. */
CHAR_T **pp, /* Pointer store. */
size_t *lenp, /* Length store. */
int *isemptyp)
{
recno_t l1;
if (isemptyp != NULL)
*isemptyp = 0;
/* If the line exists, simply return it. */
if (!db_get(sp, lno, 0, pp, lenp))
return (0);
/*
* If the user asked for line 0 or line 1, i.e. the only possible
* line in an empty file, find the last line of the file; db_last
* fails loudly.
*/
if ((lno == 0 || lno == 1) && db_last(sp, &l1))
return (1);
/* If the file isn't empty, fail loudly. */
if ((lno != 0 && lno != 1) || l1 != 0) {
db_err(sp, lno);
return (1);
}
if (isemptyp != NULL)
*isemptyp = 1;
return (1);
}
/*
* db_get --
* Look in the text buffers for a line, followed by the cache, followed
* by the database.
*
* PUBLIC: int db_get __P((SCR *, recno_t, u_int32_t, CHAR_T **, size_t *));
*/
int
db_get(
SCR *sp,
recno_t lno, /* Line number. */
u_int32_t flags,
CHAR_T **pp, /* Pointer store. */
size_t *lenp) /* Length store. */
{
DBT data, key;
EXF *ep;
TEXT *tp;
recno_t l1, l2;
CHAR_T *wp;
size_t wlen;
size_t nlen;
/*
* 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)
goto err1;
/* Check for no underlying file. */
if ((ep = sp->ep) == NULL) {
ex_emsg(sp, NULL, EXM_NOFILEYET);
goto err3;
}
if (LF_ISSET(DBG_NOCACHE))
goto nocache;
/*
* Look-aside into the TEXT buffers and see if the line we want
* is there.
*/
if (F_ISSET(sp, SC_TINPUT)) {
l1 = ((TEXT *)TAILQ_FIRST(sp->tiq))->lno;
l2 = ((TEXT *)TAILQ_LAST(sp->tiq, _texth))->lno;
if (l1 <= lno && l2 >= lno) {
#if defined(DEBUG) && 0
TRACE(sp, "retrieve TEXT buffer line %lu\n", (u_long)lno);
#endif
for (tp = TAILQ_FIRST(sp->tiq);
tp->lno != lno; tp = TAILQ_NEXT(tp, q));
if (lenp != NULL)
*lenp = tp->len;
if (pp != NULL)
*pp = tp->lb;
return (0);
}
/*
* Adjust the line number for the number of lines used
* by the text input buffers.
*/
if (lno > l2)
lno -= l2 - l1;
}
/* Look-aside into the cache, and see if the line we want is there. */
if (lno == ep->c_lno) {
#if defined(DEBUG) && 0
TRACE(sp, "retrieve cached line %lu\n", (u_long)lno);
#endif
if (lenp != NULL)
*lenp = ep->c_len;
if (pp != NULL)
*pp = ep->c_lp;
return (0);
}
ep->c_lno = OOBLNO;
nocache:
nlen = 1024;
retry:
/* 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:
goto err2;
case 1:
err1: if (LF_ISSET(DBG_FATAL))
err2: db_err(sp, lno);
alloc_err:
err3: if (lenp != NULL)
*lenp = 0;
if (pp != NULL)
*pp = NULL;
return (1);
case 0:
if (data.size > nlen) {
nlen = data.size;
goto retry;
}
}
if (FILE2INT(sp, data.data, data.size, wp, wlen)) {
if (!F_ISSET(sp, SC_CONV_ERROR)) {
F_SET(sp, SC_CONV_ERROR);
msgq(sp, M_ERR, "324|Conversion error on line %d", lno);
}
goto err3;
}
/* Reset the cache. */
if (wp != data.data) {
BINC_GOTOW(sp, ep->c_lp, ep->c_blen, wlen);
MEMCPY(ep->c_lp, wp, wlen);
} else
ep->c_lp = data.data;
ep->c_lno = lno;
ep->c_len = wlen;
#if defined(DEBUG) && 0
TRACE(sp, "retrieve DB line %lu\n", (u_long)lno);
#endif
if (lenp != NULL)
*lenp = wlen;
if (pp != NULL)
*pp = ep->c_lp;
return (0);
}
/*
* db_delete --
* Delete a line from the file.
*
* PUBLIC: int db_delete __P((SCR *, recno_t));
*/
int
db_delete(
SCR *sp,
recno_t lno)
{
DBT key;
EXF *ep;
#if defined(DEBUG) && 0
TRACE(sp, "delete line %lu\n", (u_long)lno);
#endif
/* Check for no underlying file. */
if ((ep = sp->ep) == NULL) {
ex_emsg(sp, NULL, EXM_NOFILEYET);
return (1);
}
/* Update marks, @ and global commands. */
if (mark_insdel(sp, LINE_DELETE, lno))
return (1);
if (ex_g_insdel(sp, LINE_DELETE, lno))
return (1);
/* Log change. */
log_line(sp, lno, LOG_LINE_DELETE);
/* Update file. */
key.data = &lno;
key.size = sizeof(lno);
SIGBLOCK;
if (ep->db->del(ep->db, &key, 0) == 1) {
msgq(sp, M_SYSERR,
"003|unable to delete line %lu", (u_long)lno);
return (1);
}
SIGUNBLOCK;
/* 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 modified. */
if (F_ISSET(ep, F_FIRSTMODIFY))
(void)rcv_init(sp);
F_SET(ep, F_MODIFIED);
/* Update screen. */
return (scr_update(sp, lno, LINE_DELETE, 1));
}
/*
* db_append --
* Append a line into the file.
*
* PUBLIC: int db_append __P((SCR *, int, recno_t, CHAR_T *, size_t));
*/
int
db_append(
SCR *sp,
int update,
recno_t lno,
CHAR_T *p,
size_t len)
{
DBT data, key;
EXF *ep;
char *fp;
size_t flen;
int rval;
#if defined(DEBUG) && 0
TRACE(sp, "append to %lu: len %u {%.*s}\n", lno, len, MIN(len, 20), p);
#endif
/* Check for no underlying file. */
if ((ep = sp->ep) == NULL) {
ex_emsg(sp, NULL, EXM_NOFILEYET);
return (1);
}
INT2FILE(sp, p, len, fp, flen);
/* Update file. */
key.data = &lno;
key.size = sizeof(lno);
data.data = fp;
data.size = flen;
SIGBLOCK;
if (ep->db->put(ep->db, &key, &data, R_IAFTER) == -1) {
msgq(sp, M_SYSERR,
"004|unable to append to line %lu", (u_long)lno);
return (1);
}
SIGUNBLOCK;
/* 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);
F_SET(ep, F_MODIFIED);
/* Log change. */
log_line(sp, lno + 1, LOG_LINE_APPEND);
/* Update marks, @ and global commands. */
rval = 0;
if (mark_insdel(sp, LINE_INSERT, lno + 1))
rval = 1;
if (ex_g_insdel(sp, LINE_INSERT, lno + 1))
rval = 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, lno, LINE_APPEND, update) || rval);
}
/*
* db_insert --
* Insert a line into the file.
*
* PUBLIC: int db_insert __P((SCR *, recno_t, CHAR_T *, size_t));
*/
int
db_insert(
SCR *sp,
recno_t lno,
CHAR_T *p,
size_t len)
{
DBT data, key;
EXF *ep;
char *fp;
size_t flen;
int rval;
#if defined(DEBUG) && 0
TRACE(sp, "insert before %lu: len %lu {%.*s}\n",
(u_long)lno, (u_long)len, MIN(len, 20), p);
#endif
/* Check for no underlying file. */
if ((ep = sp->ep) == NULL) {
ex_emsg(sp, NULL, EXM_NOFILEYET);
return (1);
}
INT2FILE(sp, p, len, fp, flen);
/* Update file. */
key.data = &lno;
key.size = sizeof(lno);
data.data = fp;
data.size = flen;
SIGBLOCK;
if (ep->db->put(ep->db, &key, &data, R_IBEFORE) == -1) {
msgq(sp, M_SYSERR,
"005|unable to insert at line %lu", (u_long)lno);
return (1);
}
SIGUNBLOCK;
/* 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);
F_SET(ep, F_MODIFIED);
/* Log change. */
log_line(sp, lno, LOG_LINE_INSERT);
/* Update marks, @ and global commands. */
rval = 0;
if (mark_insdel(sp, LINE_INSERT, lno))
rval = 1;
if (ex_g_insdel(sp, LINE_INSERT, lno))
rval = 1;
/* Update screen. */
return (scr_update(sp, lno, LINE_INSERT, 1) || rval);
}
/*
* db_set --
* Store a line in the file.
*
* PUBLIC: int db_set __P((SCR *, recno_t, CHAR_T *, size_t));
*/
int
db_set(
SCR *sp,
recno_t lno,
CHAR_T *p,
size_t len)
{
DBT data, key;
EXF *ep;
char *fp;
size_t flen;
#if defined(DEBUG) && 0
TRACE(sp, "replace line %lu: len %lu {%.*s}\n",
(u_long)lno, (u_long)len, MIN(len, 20), p);
#endif
/* Check for no underlying file. */
if ((ep = sp->ep) == NULL) {
ex_emsg(sp, NULL, EXM_NOFILEYET);
return (1);
}
/* Log before change. */
log_line(sp, lno, LOG_LINE_RESET_B);
INT2FILE(sp, p, len, fp, flen);
/* Update file. */
key.data = &lno;
key.size = sizeof(lno);
data.data = fp;
data.size = flen;
SIGBLOCK;
if (ep->db->put(ep->db, &key, &data, 0) == -1) {
msgq(sp, M_SYSERR,
"006|unable to store line %lu", (u_long)lno);
return (1);
}
SIGUNBLOCK;
/* 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);
F_SET(ep, F_MODIFIED);
/* Log after change. */
log_line(sp, lno, LOG_LINE_RESET_F);
/* Update screen. */
return (scr_update(sp, lno, LINE_RESET, 1));
}
/*
* db_exist --
* Return if a line exists.
*
* PUBLIC: int db_exist __P((SCR *, recno_t));
*/
int
db_exist(
SCR *sp,
recno_t lno)
{
EXF *ep;
/* Check for no underlying file. */
if ((ep = sp->ep) == NULL) {
ex_emsg(sp, NULL, EXM_NOFILEYET);
return (1);
}
if (lno == OOBLNO)
return (0);
/*
* Check the last-line number cache. Adjust the cached line
* number for the lines used by the text input buffers.
*/
if (ep->c_nlines != OOBLNO)
return (lno <= (F_ISSET(sp, SC_TINPUT) ?
ep->c_nlines + (((TEXT *)TAILQ_LAST(sp->tiq, _texth))->lno -
((TEXT *)TAILQ_FIRST(sp->tiq))->lno) : ep->c_nlines));
/* Go get the line. */
return (!db_get(sp, lno, 0, NULL, NULL));
}
/*
* db_last --
* Return the number of lines in the file.
*
* PUBLIC: int db_last __P((SCR *, recno_t *));
*/
int
db_last(
SCR *sp,
recno_t *lnop)
{
DBT data, key;
EXF *ep;
recno_t lno;
CHAR_T *wp;
size_t wlen;
/* Check for no underlying file. */
if ((ep = sp->ep) == NULL) {
ex_emsg(sp, NULL, EXM_NOFILEYET);
return (1);
}
/*
* Check the last-line number cache. Adjust the cached line
* number for the lines used by the text input buffers.
*/
if (ep->c_nlines != OOBLNO) {
*lnop = ep->c_nlines;
if (F_ISSET(sp, SC_TINPUT))
*lnop += ((TEXT *)TAILQ_LAST(sp->tiq, _texth))->lno -
((TEXT *)TAILQ_FIRST(sp->tiq))->lno;
return (0);
}
key.data = &lno;
key.size = sizeof(lno);
switch (ep->db->seq(ep->db, &key, &data, R_LAST)) {
case -1:
alloc_err:
msgq(sp, M_SYSERR, "007|unable to get last line");
*lnop = 0;
return (1);
case 1:
*lnop = 0;
return (0);
case 0:
;
}
memcpy(&lno, key.data, sizeof(lno));
if (lno != ep->c_lno) {
FILE2INT(sp, data.data, data.size, wp, wlen);
/* Fill the cache. */
if (wp != data.data) {
BINC_GOTOW(sp, ep->c_lp, ep->c_blen, wlen);
MEMCPY(ep->c_lp, wp, wlen);
} else
ep->c_lp = data.data;
ep->c_lno = lno;
ep->c_len = wlen;
}
ep->c_nlines = lno;
/* Return the value. */
*lnop = (F_ISSET(sp, SC_TINPUT) &&
((TEXT *)TAILQ_LAST(sp->tiq, _texth))->lno > lno ?
((TEXT *)TAILQ_LAST(sp->tiq, _texth))->lno : lno);
return (0);
}
/*
* db_rget --
* Retrieve a raw line from database. No cache, no conversion.
*
* PUBLIC: int db_rget __P((SCR *, recno_t, char **, size_t *));
*/
int
db_rget(
SCR *sp,
recno_t lno, /* Line number. */
char **pp, /* Pointer store. */
size_t *lenp) /* Length store. */
{
DBT data, key;
EXF *ep;
/* Check for no underlying file. */
if ((ep = sp->ep) == NULL)
return (1);
/* Get the line from the underlying database. */
key.data = &lno;
key.size = sizeof(lno);
if (ep->db->get(ep->db, &key, &data, 0))
/* We do not report error, and do not ensure the size! */
return (1);
if (lenp != NULL)
*lenp = data.size;
if (pp != NULL)
*pp = data.data;
return (0);
}
/*
* db_rset --
* Store a line in the file. No log, no conversion.
*
* PUBLIC: int db_rset __P((SCR *, recno_t, char *, size_t));
*/
int
db_rset(
SCR *sp,
recno_t lno,
char *p,
size_t len)
{
DBT data, key;
EXF *ep;
/* Check for no underlying file. */
if ((ep = sp->ep) == NULL)
return (1);
/* 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)
/* We do not report error, and do not ensure the size! */
return (1);
return (0);
}
/*
* db_err --
* Report a line error.
*
* PUBLIC: void db_err __P((SCR *, recno_t));
*/
void
db_err(
SCR *sp,
recno_t lno)
{
msgq(sp, M_ERR,
"008|Error: unable to retrieve line %lu", (u_long)lno);
}
/*
* scr_update --
* Update all of the screens that are backed by the file that
* just changed.
*/
static int
scr_update(
SCR *sp,
recno_t lno,
lnop_t op,
int current)
{
EXF *ep;
SCR *tsp;
if (F_ISSET(sp, SC_EX))
return (0);
ep = sp->ep;
if (ep->refcnt != 1)
TAILQ_FOREACH(tsp, sp->gp->dq, q)
if (sp != tsp && tsp->ep == ep)
if (vs_change(tsp, lno, op))
return (1);
return (current ? vs_change(sp, lno, op) : 0);
}
