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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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get_colbyt.c
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C/C++ Source or Header
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1993-09-10
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2KB
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53 lines
/*
* 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 "memory.h"
#include "rec.h"
#include "window.h"
#include "ed_dec.h"
/******************************************************************************\
|Routine: get_colbyt
|Callby: copier insert killer
|Purpose: Returns the byte offset in a record of the byte that corresponds to the given column number.
| Converts all TABs in the record to spaces, and makes sure the record is long enough to include the given column.
|Arguments:
| r is the record being analyzed.
| column is the column number.
\******************************************************************************/
Int get_colbyt(r,column)
rec_ptr r;
Int column;
{
register Int l;
Char *buf;
l = express(r->length,r->data,TAB_STRING[CUR_TAB_SETUP],TAB_LENGTH[CUR_TAB_SETUP],&buf,0,0);
while(l < column) /* this is dangerous */
buf[l++] = ' ';
if(r->recflags & 1)
ifree(r->data); /* replace the record with the expressed record */
r->data = (Char *)imalloc(l + 1);
r->recflags = 1; /* mark it as freeable */
memcpy(r->data,buf,l);
r->data[l] = '\0';
r->length = l;
return(column - 1); /* return trapped byte offset */
}