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C/C++ Users Group Library 1996 July
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C-C++ Users Group Library July 1996.iso
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vol_400
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424_02
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ED-157
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rec_split.c
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1993-09-10
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/*
* Copyright (C) 1992 by Rush Record (rhr@clio.rice.edu)
*
* This file is part of ED.
*
* ED is free software; you can redistribute it and/or modify it under the terms
* of the GNU General Public License as published by the Free Software Foundation.
*
* ED is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
* PARTICULAR PURPOSE. See the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along with ED
* (see the file COPYING). If not, write to the Free Software Foundation, 675
* Mass Ave, Cambridge, MA 02139, USA.
*/
#include "opsys.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "memory.h"
#include "rec.h"
#include "window.h"
#include "ed_dec.h"
/******************************************************************************\
|Routine: rec_split
|Callby: insert
|Purpose: Splits a record in two.
|Arguments:
| prec is the record to be split.
| byt is the location of the split point. Everything from [byt] forward goes
| to the new record.
\******************************************************************************/
void rec_split(prec,byt)
rec_ptr *prec;
Int byt;
{
rec_ptr rec,new;
Int i;
rec = *prec;
new = (rec_ptr)imalloc(sizeof(rec_node));
new->data = (Char *)imalloc(rec->length - byt + 1);
new->recflags = 1; /* it is a freeable buffer */
if((new->length = rec->length - byt) > 0)
memcpy(new->data,&rec->data[byt],new->length);
new->data[new->length] = '\0';
if(rec == BASE)
{
insq(new,rec->prev); /* insert a blank record just before the [eob] */
*prec = new; /* we be located at the new record, not [eob] */
}
else
{
for(i = 0;i < NMARK;i++)
if(rec == MARKREC[i] && MARKBYT[i] >= byt)
{
MARKREC[i] = new;
MARKBYT[i] -= byt;
}
if(rec == SELREC && SELBYT > byt)
{
SELREC = new;
SELBYT -= byt;
}
rec_trim(prec,byt,rec->length); /* trim what follows byt in original rec */
insq(new,*prec);
}
}