164 lines
3.6 KiB
C
164 lines
3.6 KiB
C
/*-
|
|
* 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: delete.c,v 10.18 2012/02/11 15:52:33 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 <stdlib.h>
|
|
#include <string.h>
|
|
|
|
#include "common.h"
|
|
|
|
/*
|
|
* del --
|
|
* Delete a range of text.
|
|
*
|
|
* PUBLIC: int del(SCR *, MARK *, MARK *, int);
|
|
*/
|
|
int
|
|
del(
|
|
SCR *sp,
|
|
MARK *fm,
|
|
MARK *tm,
|
|
int lmode)
|
|
{
|
|
recno_t lno;
|
|
size_t blen, len, nlen, tlen;
|
|
CHAR_T *bp, *p;
|
|
int eof, rval;
|
|
|
|
bp = NULL;
|
|
|
|
/* Case 1 -- delete in line mode. */
|
|
if (lmode) {
|
|
for (lno = tm->lno; lno >= fm->lno; --lno) {
|
|
if (db_delete(sp, lno))
|
|
return (1);
|
|
++sp->rptlines[L_DELETED];
|
|
if (lno % INTERRUPT_CHECK == 0 && INTERRUPTED(sp))
|
|
break;
|
|
}
|
|
goto done;
|
|
}
|
|
|
|
/*
|
|
* Case 2 -- delete to EOF. This is a special case because it's
|
|
* easier to pick it off than try and find it in the other cases.
|
|
*/
|
|
if (db_last(sp, &lno))
|
|
return (1);
|
|
if (tm->lno >= lno) {
|
|
if (tm->lno == lno) {
|
|
if (db_get(sp, lno, DBG_FATAL, &p, &len))
|
|
return (1);
|
|
eof = tm->cno != ENTIRE_LINE && tm->cno >= len ? 1 : 0;
|
|
} else
|
|
eof = 1;
|
|
if (eof) {
|
|
for (lno = tm->lno; lno > fm->lno; --lno) {
|
|
if (db_delete(sp, lno))
|
|
return (1);
|
|
++sp->rptlines[L_DELETED];
|
|
if (lno %
|
|
INTERRUPT_CHECK == 0 && INTERRUPTED(sp))
|
|
break;
|
|
}
|
|
if (db_get(sp, fm->lno, DBG_FATAL, &p, &len))
|
|
return (1);
|
|
GET_SPACE_RETW(sp, bp, blen, fm->cno);
|
|
MEMCPY(bp, p, fm->cno);
|
|
if (db_set(sp, fm->lno, bp, fm->cno))
|
|
return (1);
|
|
goto done;
|
|
}
|
|
}
|
|
|
|
/* Case 3 -- delete within a single line. */
|
|
if (tm->lno == fm->lno) {
|
|
if (db_get(sp, fm->lno, DBG_FATAL, &p, &len))
|
|
return (1);
|
|
GET_SPACE_RETW(sp, bp, blen, len);
|
|
if (fm->cno != 0)
|
|
MEMCPY(bp, p, fm->cno);
|
|
MEMCPY(bp + fm->cno, p + (tm->cno + 1),
|
|
len - (tm->cno + 1));
|
|
if (db_set(sp, fm->lno,
|
|
bp, len - ((tm->cno - fm->cno) + 1)))
|
|
goto err;
|
|
goto done;
|
|
}
|
|
|
|
/*
|
|
* Case 4 -- delete over multiple lines.
|
|
*
|
|
* Copy the start partial line into place.
|
|
*/
|
|
if ((tlen = fm->cno) != 0) {
|
|
if (db_get(sp, fm->lno, DBG_FATAL, &p, NULL))
|
|
return (1);
|
|
GET_SPACE_RETW(sp, bp, blen, tlen + 256);
|
|
MEMCPY(bp, p, tlen);
|
|
}
|
|
|
|
/* Copy the end partial line into place. */
|
|
if (db_get(sp, tm->lno, DBG_FATAL, &p, &len))
|
|
goto err;
|
|
if (len != 0 && tm->cno != len - 1) {
|
|
/*
|
|
* XXX
|
|
* We can overflow memory here, if the total length is greater
|
|
* than SIZE_T_MAX. The only portable way I've found to test
|
|
* is depending on the overflow being less than the value.
|
|
*/
|
|
nlen = (len - (tm->cno + 1)) + tlen;
|
|
if (tlen > nlen) {
|
|
msgq(sp, M_ERR, "002|Line length overflow");
|
|
goto err;
|
|
}
|
|
if (tlen == 0) {
|
|
GET_SPACE_RETW(sp, bp, blen, nlen);
|
|
} else
|
|
ADD_SPACE_RETW(sp, bp, blen, nlen);
|
|
|
|
MEMCPY(bp + tlen, p + (tm->cno + 1), len - (tm->cno + 1));
|
|
tlen += len - (tm->cno + 1);
|
|
}
|
|
|
|
/* Set the current line. */
|
|
if (db_set(sp, fm->lno, bp, tlen))
|
|
goto err;
|
|
|
|
/* Delete the last and intermediate lines. */
|
|
for (lno = tm->lno; lno > fm->lno; --lno) {
|
|
if (db_delete(sp, lno))
|
|
goto err;
|
|
++sp->rptlines[L_DELETED];
|
|
if (lno % INTERRUPT_CHECK == 0 && INTERRUPTED(sp))
|
|
break;
|
|
}
|
|
|
|
done: rval = 0;
|
|
if (0)
|
|
err: rval = 1;
|
|
if (bp != NULL)
|
|
FREE_SPACEW(sp, bp, blen);
|
|
return (rval);
|
|
}
|