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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_column.c
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C/C++ Source or Header
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1994-02-08
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/*
* Copyright (C) 1992 by Rush Record
* Copyright (C) 1993 by Charles Sandmann (sandmann@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 "rec.h"
#include "window.h"
#include "ed_dec.h"
/******************************************************************************\
|Routine: get_column
|Callby: cfrendly change_case copier down_arrow edit fix_scroll insert killer left_arrow match_paren move_eol move_word paint paint_window set_param trim unselect up_arrow word_fill
|Purpose: Returns the column number of a particular byte in a record.
|Arguments:
| r is the record being analyzed.
| byte is the byte offset in that record.
\******************************************************************************/
Int get_column(r,byte)
rec_ptr r;
Int byte;
{
register Int c,ch;
register Char *p,*q;
if(HEXMODE)
return((byte << 2) + 1);
for(p = r->data,q = r->data + byte,c = 0;p != q;p++)
{
if((ch = *p) == '\t')
c = tabstop(c);
else if(NONPRINTNCS(ch))
c += 4;
else
c++;
}
return(c + 1);
}