163 lines
3.6 KiB
C
163 lines
3.6 KiB
C
/* $NetBSD: delete.c,v 1.4 2001/09/09 11:03:02 aymeric 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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#ifndef lint
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static const char sccsid[] = "@(#)delete.c 10.12 (Berkeley) 10/23/96";
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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 <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 <stdlib.h>
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#include <string.h>
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#include "common.h"
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/*
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* del --
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* Delete a range of text.
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*
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* PUBLIC: int del __P((SCR *, MARK *, MARK *, int));
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*/
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int
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del(sp, fm, tm, lmode)
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SCR *sp;
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MARK *fm, *tm;
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int lmode;
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{
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recno_t lno;
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size_t blen, len, nlen, tlen;
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char *bp, *p;
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int eof, rval;
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bp = NULL;
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/* Case 1 -- delete in line mode. */
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if (lmode) {
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for (lno = tm->lno; lno >= fm->lno; --lno) {
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if (db_delete(sp, lno))
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return (1);
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++sp->rptlines[L_DELETED];
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if (lno % INTERRUPT_CHECK == 0 && INTERRUPTED(sp))
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break;
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}
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goto done;
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}
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/*
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* Case 2 -- delete to EOF. This is a special case because it's
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* easier to pick it off than try and find it in the other cases.
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*/
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if (db_last(sp, &lno))
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return (1);
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if (tm->lno >= lno) {
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if (tm->lno == lno) {
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if (db_get(sp, lno, DBG_FATAL, &p, &len))
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return (1);
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eof = tm->cno != -1 && tm->cno >= len ? 1 : 0;
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} else
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eof = 1;
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if (eof) {
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for (lno = tm->lno; lno > fm->lno; --lno) {
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if (db_delete(sp, lno))
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return (1);
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++sp->rptlines[L_DELETED];
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if (lno %
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INTERRUPT_CHECK == 0 && INTERRUPTED(sp))
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break;
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}
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if (db_get(sp, fm->lno, DBG_FATAL, &p, &len))
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return (1);
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GET_SPACE_RET(sp, bp, blen, fm->cno);
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memcpy(bp, p, fm->cno);
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if (db_set(sp, fm->lno, bp, fm->cno))
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return (1);
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goto done;
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}
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}
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/* Case 3 -- delete within a single line. */
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if (tm->lno == fm->lno) {
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if (db_get(sp, fm->lno, DBG_FATAL, &p, &len))
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return (1);
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GET_SPACE_RET(sp, bp, blen, len);
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if (fm->cno != 0)
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memcpy(bp, p, fm->cno);
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memcpy(bp + fm->cno, p + (tm->cno + 1), len - (tm->cno + 1));
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if (db_set(sp, fm->lno,
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bp, len - ((tm->cno - fm->cno) + 1)))
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goto err;
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goto done;
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}
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/*
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* Case 4 -- delete over multiple lines.
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*
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* Copy the start partial line into place.
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*/
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if ((tlen = fm->cno) != 0) {
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if (db_get(sp, fm->lno, DBG_FATAL, &p, NULL))
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return (1);
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GET_SPACE_RET(sp, bp, blen, tlen + 256);
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memcpy(bp, p, tlen);
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}
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/* Copy the end partial line into place. */
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if (db_get(sp, tm->lno, DBG_FATAL, &p, &len))
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goto err;
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if (len != 0 && tm->cno != len - 1) {
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/*
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* XXX
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* We can overflow memory here, if the total length is greater
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* than SIZE_T_MAX. The only portable way I've found to test
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* is depending on the overflow being less than the value.
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*/
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nlen = (len - (tm->cno + 1)) + tlen;
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if (tlen > nlen) {
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msgq(sp, M_ERR, "002|Line length overflow");
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goto err;
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}
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if (tlen == 0) {
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GET_SPACE_RET(sp, bp, blen, nlen);
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} else
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ADD_SPACE_RET(sp, bp, blen, nlen);
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memcpy(bp + tlen, p + (tm->cno + 1), len - (tm->cno + 1));
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tlen += len - (tm->cno + 1);
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}
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/* Set the current line. */
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if (db_set(sp, fm->lno, bp, tlen))
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goto err;
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/* Delete the last and intermediate lines. */
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for (lno = tm->lno; lno > fm->lno; --lno) {
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if (db_delete(sp, lno))
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goto err;
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++sp->rptlines[L_DELETED];
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if (lno % INTERRUPT_CHECK == 0 && INTERRUPTED(sp))
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break;
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}
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done: rval = 0;
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if (0)
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err: rval = 1;
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if (bp != NULL)
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FREE_SPACE(sp, bp, blen);
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return (rval);
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}
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