604 lines
12 KiB
C
604 lines
12 KiB
C
/* $NetBSD: line.c,v 1.6 2003/04/18 18:46:26 christos Exp $ */
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/*-
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* Copyright (c) 1992, 1993, 1994
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* The Regents of the University of California. All rights reserved.
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* Copyright (c) 1992, 1993, 1994, 1995, 1996
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* Keith Bostic. All rights reserved.
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*
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* See the LICENSE file for redistribution information.
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*/
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#include "config.h"
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#include <sys/cdefs.h>
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#ifndef lint
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#if 0
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static const char sccsid[] = "@(#)line.c 10.21 (Berkeley) 9/15/96";
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#else
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__RCSID("$NetBSD: line.c,v 1.6 2003/04/18 18:46:26 christos Exp $");
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#endif
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#endif /* not lint */
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#include <sys/types.h>
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#include <sys/queue.h>
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#include <sys/time.h>
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#include <sys/stat.h>
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#include <bitstring.h>
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#include <errno.h>
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#include <limits.h>
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#include <stdio.h>
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#include <string.h>
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#include "common.h"
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#include "../vi/vi.h"
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static int scr_update __P((SCR *, recno_t, lnop_t, int));
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/*
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* db_eget --
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* Front-end to db_get, special case handling for empty files.
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*
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* PUBLIC: int db_eget __P((SCR *, recno_t, char **, size_t *, int *));
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*/
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int
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db_eget(sp, lno, pp, lenp, isemptyp)
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SCR *sp;
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recno_t lno; /* Line number. */
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char **pp; /* Pointer store. */
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size_t *lenp; /* Length store. */
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int *isemptyp;
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{
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recno_t l1;
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if (isemptyp != NULL)
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*isemptyp = 0;
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/* If the line exists, simply return it. */
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if (!db_get(sp, lno, 0, pp, lenp))
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return (0);
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/*
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* If the user asked for line 0 or line 1, i.e. the only possible
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* line in an empty file, find the last line of the file; db_last
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* fails loudly.
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*/
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if ((lno == 0 || lno == 1) && db_last(sp, &l1))
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return (1);
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/* If the file isn't empty, fail loudly. */
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if (lno != 0 && lno != 1 || l1 != 0) {
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db_err(sp, lno);
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return (1);
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}
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if (isemptyp != NULL)
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*isemptyp = 1;
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return (1);
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}
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/*
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* db_get --
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* Look in the text buffers for a line, followed by the cache, followed
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* by the database.
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*
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* PUBLIC: int db_get __P((SCR *, recno_t, u_int32_t, char **, size_t *));
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*/
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int
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db_get(sp, lno, flags, pp, lenp)
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SCR *sp;
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recno_t lno; /* Line number. */
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u_int32_t flags;
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char **pp; /* Pointer store. */
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size_t *lenp; /* Length store. */
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{
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DBT data, key;
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EXF *ep;
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TEXT *tp;
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recno_t l1, l2;
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/*
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* The underlying recno stuff handles zero by returning NULL, but
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* have to have an OOB condition for the look-aside into the input
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* buffer anyway.
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*/
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if (lno == 0)
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goto err1;
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/* Check for no underlying file. */
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if ((ep = sp->ep) == NULL) {
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ex_emsg(sp, NULL, EXM_NOFILEYET);
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goto err3;
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}
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if (LF_ISSET(DBG_NOCACHE))
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goto nocache;
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/*
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* Look-aside into the TEXT buffers and see if the line we want
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* is there.
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*/
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if (F_ISSET(sp, SC_TINPUT)) {
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l1 = ((TEXT *)sp->tiq.cqh_first)->lno;
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l2 = ((TEXT *)sp->tiq.cqh_last)->lno;
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if (l1 <= lno && l2 >= lno) {
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#if defined(DEBUG) && 0
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TRACE(sp, "retrieve TEXT buffer line %lu\n", (u_long)lno);
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#endif
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for (tp = sp->tiq.cqh_first;
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tp->lno != lno; tp = tp->q.cqe_next);
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if (lenp != NULL)
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*lenp = tp->len;
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if (pp != NULL)
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*pp = tp->lb;
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return (0);
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}
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/*
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* Adjust the line number for the number of lines used
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* by the text input buffers.
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*/
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if (lno > l2)
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lno -= l2 - l1;
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}
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/* Look-aside into the cache, and see if the line we want is there. */
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if (lno == ep->c_lno) {
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#if defined(DEBUG) && 0
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TRACE(sp, "retrieve cached line %lu\n", (u_long)lno);
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#endif
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if (lenp != NULL)
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*lenp = ep->c_len;
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if (pp != NULL)
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*pp = ep->c_lp;
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return (0);
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}
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ep->c_lno = OOBLNO;
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nocache:
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/* Get the line from the underlying database. */
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key.data = &lno;
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key.size = sizeof(lno);
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switch (ep->db->get(ep->db, &key, &data, 0)) {
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case -1:
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goto err2;
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case 1:
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err1: if (LF_ISSET(DBG_FATAL))
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err2: db_err(sp, lno);
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err3: if (lenp != NULL)
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*lenp = 0;
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if (pp != NULL)
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*pp = NULL;
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return (1);
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}
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if (F_ISSET(sp, SC_ARGRECOVER)) {
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/*
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* Don't trust the integrity of the db.
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*/
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struct stat st;
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int fd = (*ep->db->fd)(ep->db);
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if (fd != -1 && fstat(fd, &st) != -1) {
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if (data.size > (size_t)st.st_size)
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data.size = strlen((const char *)data.data);
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} else {
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/*
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* This breaks recovery of binary files
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*/
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size_t olen = strlen((const char *)data.data);
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if (olen < data.size)
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data.size = olen;
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}
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}
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/* Reset the cache. */
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ep->c_lno = lno;
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ep->c_len = data.size;
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ep->c_lp = data.data;
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#if defined(DEBUG) && 0
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TRACE(sp, "retrieve DB line %lu\n", (u_long)lno);
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#endif
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if (lenp != NULL)
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*lenp = data.size;
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if (pp != NULL)
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*pp = ep->c_lp;
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return (0);
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}
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/*
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* db_delete --
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* Delete a line from the file.
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*
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* PUBLIC: int db_delete __P((SCR *, recno_t));
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*/
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int
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db_delete(sp, lno)
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SCR *sp;
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recno_t lno;
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{
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DBT key;
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EXF *ep;
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#if defined(DEBUG) && 0
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TRACE(sp, "delete line %lu\n", (u_long)lno);
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#endif
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/* Check for no underlying file. */
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if ((ep = sp->ep) == NULL) {
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ex_emsg(sp, NULL, EXM_NOFILEYET);
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return (1);
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}
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/* Update marks, @ and global commands. */
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if (mark_insdel(sp, LINE_DELETE, lno))
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return (1);
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if (ex_g_insdel(sp, LINE_DELETE, lno))
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return (1);
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/* Log change. */
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log_line(sp, lno, LOG_LINE_DELETE);
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/* Update file. */
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key.data = &lno;
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key.size = sizeof(lno);
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SIGBLOCK;
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if (ep->db->del(ep->db, &key, 0) == 1) {
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msgq(sp, M_SYSERR,
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"003|unable to delete line %lu", (u_long)lno);
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return (1);
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}
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SIGUNBLOCK;
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/* Flush the cache, update line count, before screen update. */
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if (lno <= ep->c_lno)
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ep->c_lno = OOBLNO;
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if (ep->c_nlines != OOBLNO)
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--ep->c_nlines;
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/* File now modified. */
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if (F_ISSET(ep, F_FIRSTMODIFY))
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(void)rcv_init(sp);
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F_SET(ep, F_MODIFIED);
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/* Update screen. */
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return (scr_update(sp, lno, LINE_DELETE, 1));
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}
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/*
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* db_append --
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* Append a line into the file.
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*
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* PUBLIC: int db_append __P((SCR *, int, recno_t, char *, size_t));
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*/
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int
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db_append(sp, update, lno, p, len)
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SCR *sp;
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int update;
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recno_t lno;
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char *p;
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size_t len;
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{
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DBT data, key;
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EXF *ep;
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int rval;
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#if defined(DEBUG) && 0
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TRACE(sp, "append to %lu: len %u {%.*s}\n", lno, len, MIN(len, 20), p);
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#endif
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/* Check for no underlying file. */
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if ((ep = sp->ep) == NULL) {
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ex_emsg(sp, NULL, EXM_NOFILEYET);
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return (1);
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}
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/* Update file. */
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key.data = &lno;
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key.size = sizeof(lno);
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data.data = p;
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data.size = len;
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SIGBLOCK;
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if (ep->db->put(ep->db, &key, &data, R_IAFTER) == -1) {
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msgq(sp, M_SYSERR,
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"004|unable to append to line %lu", (u_long)lno);
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return (1);
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}
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SIGUNBLOCK;
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/* Flush the cache, update line count, before screen update. */
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if (lno < ep->c_lno)
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ep->c_lno = OOBLNO;
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if (ep->c_nlines != OOBLNO)
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++ep->c_nlines;
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/* File now dirty. */
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if (F_ISSET(ep, F_FIRSTMODIFY))
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(void)rcv_init(sp);
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F_SET(ep, F_MODIFIED);
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/* Log change. */
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log_line(sp, lno + 1, LOG_LINE_APPEND);
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/* Update marks, @ and global commands. */
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rval = 0;
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if (mark_insdel(sp, LINE_INSERT, lno + 1))
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rval = 1;
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if (ex_g_insdel(sp, LINE_INSERT, lno + 1))
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rval = 1;
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/*
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* Update screen.
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*
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* XXX
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* Nasty hack. If multiple lines are input by the user, they aren't
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* committed until an <ESC> is entered. The problem is the screen was
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* updated/scrolled as each line was entered. So, when this routine
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* is called to copy the new lines from the cut buffer into the file,
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* it has to know not to update the screen again.
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*/
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return (scr_update(sp, lno, LINE_APPEND, update) || rval);
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}
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/*
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* db_insert --
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* Insert a line into the file.
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*
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* PUBLIC: int db_insert __P((SCR *, recno_t, char *, size_t));
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*/
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int
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db_insert(sp, lno, p, len)
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SCR *sp;
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recno_t lno;
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char *p;
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size_t len;
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{
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DBT data, key;
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EXF *ep;
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int rval;
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#if defined(DEBUG) && 0
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TRACE(sp, "insert before %lu: len %lu {%.*s}\n",
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(u_long)lno, (u_long)len, MIN(len, 20), p);
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#endif
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/* Check for no underlying file. */
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if ((ep = sp->ep) == NULL) {
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ex_emsg(sp, NULL, EXM_NOFILEYET);
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return (1);
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}
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/* Update file. */
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key.data = &lno;
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key.size = sizeof(lno);
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data.data = p;
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data.size = len;
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SIGBLOCK;
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if (ep->db->put(ep->db, &key, &data, R_IBEFORE) == -1) {
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msgq(sp, M_SYSERR,
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"005|unable to insert at line %lu", (u_long)lno);
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return (1);
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}
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SIGUNBLOCK;
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/* Flush the cache, update line count, before screen update. */
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if (lno >= ep->c_lno)
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ep->c_lno = OOBLNO;
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if (ep->c_nlines != OOBLNO)
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++ep->c_nlines;
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/* File now dirty. */
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if (F_ISSET(ep, F_FIRSTMODIFY))
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(void)rcv_init(sp);
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F_SET(ep, F_MODIFIED);
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/* Log change. */
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log_line(sp, lno, LOG_LINE_INSERT);
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/* Update marks, @ and global commands. */
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rval = 0;
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if (mark_insdel(sp, LINE_INSERT, lno))
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rval = 1;
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if (ex_g_insdel(sp, LINE_INSERT, lno))
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rval = 1;
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/* Update screen. */
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return (scr_update(sp, lno, LINE_INSERT, 1) || rval);
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}
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/*
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* db_set --
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* Store a line in the file.
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*
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* PUBLIC: int db_set __P((SCR *, recno_t, char *, size_t));
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*/
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int
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db_set(sp, lno, p, len)
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SCR *sp;
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recno_t lno;
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char *p;
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size_t len;
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{
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DBT data, key;
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EXF *ep;
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#if defined(DEBUG) && 0
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TRACE(sp, "replace line %lu: len %lu {%.*s}\n",
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(u_long)lno, (u_long)len, MIN(len, 20), p);
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#endif
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/* Check for no underlying file. */
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if ((ep = sp->ep) == NULL) {
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ex_emsg(sp, NULL, EXM_NOFILEYET);
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return (1);
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}
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/* Log before change. */
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log_line(sp, lno, LOG_LINE_RESET_B);
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/* Update file. */
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key.data = &lno;
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key.size = sizeof(lno);
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data.data = p;
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data.size = len;
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SIGBLOCK;
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if (ep->db->put(ep->db, &key, &data, 0) == -1) {
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msgq(sp, M_SYSERR,
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"006|unable to store line %lu", (u_long)lno);
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return (1);
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}
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SIGUNBLOCK;
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/* Flush the cache, before logging or screen update. */
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if (lno == ep->c_lno)
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ep->c_lno = OOBLNO;
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/* File now dirty. */
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if (F_ISSET(ep, F_FIRSTMODIFY))
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(void)rcv_init(sp);
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F_SET(ep, F_MODIFIED);
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/* Log after change. */
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log_line(sp, lno, LOG_LINE_RESET_F);
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/* Update screen. */
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return (scr_update(sp, lno, LINE_RESET, 1));
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}
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/*
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* db_exist --
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* Return if a line exists.
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*
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* PUBLIC: int db_exist __P((SCR *, recno_t));
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*/
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int
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db_exist(sp, lno)
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SCR *sp;
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recno_t lno;
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{
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EXF *ep;
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/* Check for no underlying file. */
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if ((ep = sp->ep) == NULL) {
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ex_emsg(sp, NULL, EXM_NOFILEYET);
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return (1);
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}
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if (lno == OOBLNO)
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return (0);
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/*
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* Check the last-line number cache. Adjust the cached line
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* number for the lines used by the text input buffers.
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*/
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if (ep->c_nlines != OOBLNO)
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return (lno <= (F_ISSET(sp, SC_TINPUT) ?
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ep->c_nlines + (((TEXT *)sp->tiq.cqh_last)->lno -
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((TEXT *)sp->tiq.cqh_first)->lno) : ep->c_nlines));
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/* Go get the line. */
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return (!db_get(sp, lno, 0, NULL, NULL));
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}
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/*
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* db_last --
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* Return the number of lines in the file.
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*
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* PUBLIC: int db_last __P((SCR *, recno_t *));
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*/
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int
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db_last(sp, lnop)
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SCR *sp;
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recno_t *lnop;
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{
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DBT data, key;
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EXF *ep;
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recno_t lno;
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/* Check for no underlying file. */
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if ((ep = sp->ep) == NULL) {
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ex_emsg(sp, NULL, EXM_NOFILEYET);
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return (1);
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}
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/*
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* Check the last-line number cache. Adjust the cached line
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* number for the lines used by the text input buffers.
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*/
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if (ep->c_nlines != OOBLNO) {
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*lnop = ep->c_nlines;
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if (F_ISSET(sp, SC_TINPUT))
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*lnop += ((TEXT *)sp->tiq.cqh_last)->lno -
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((TEXT *)sp->tiq.cqh_first)->lno;
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return (0);
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}
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key.data = &lno;
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key.size = sizeof(lno);
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|
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switch (ep->db->seq(ep->db, &key, &data, R_LAST)) {
|
|
case -1:
|
|
msgq(sp, M_SYSERR, "007|unable to get last line");
|
|
*lnop = 0;
|
|
return (1);
|
|
case 1:
|
|
*lnop = 0;
|
|
return (0);
|
|
default:
|
|
break;
|
|
}
|
|
|
|
/* Fill the cache. */
|
|
memcpy(&lno, key.data, sizeof(lno));
|
|
ep->c_nlines = ep->c_lno = lno;
|
|
ep->c_len = data.size;
|
|
ep->c_lp = data.data;
|
|
|
|
/* Return the value. */
|
|
*lnop = (F_ISSET(sp, SC_TINPUT) &&
|
|
((TEXT *)sp->tiq.cqh_last)->lno > lno ?
|
|
((TEXT *)sp->tiq.cqh_last)->lno : lno);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* db_err --
|
|
* Report a line error.
|
|
*
|
|
* PUBLIC: void db_err __P((SCR *, recno_t));
|
|
*/
|
|
void
|
|
db_err(sp, lno)
|
|
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(sp, lno, op, current)
|
|
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)
|
|
for (tsp = sp->gp->dq.cqh_first;
|
|
tsp != (void *)&sp->gp->dq; tsp = tsp->q.cqe_next)
|
|
if (sp != tsp && tsp->ep == ep)
|
|
if (vs_change(tsp, lno, op))
|
|
return (1);
|
|
return (current ? vs_change(sp, lno, op) : 0);
|
|
}
|