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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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find_char.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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66 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 "rec.h"
#include "window.h"
#include "ed_dec.h"
/******************************************************************************\
|Routine: find_char
|Callby: edit
|Purpose: This routine just checks that the other end of a delete region
| does not hit the start or end of the buffer.
|Arguments:
| prepeat is the offset to the other end of the delete region.
\******************************************************************************/
Int find_char(prepeat)
Int prepeat;
{
register Int curbyt,i;
register rec_ptr currec;
curbyt = CURBYT;
currec = CURREC;
if(prepeat > 0)
{
i = prepeat;
while(currec->length - curbyt < i)
{
if(currec == BASE)
return(0);
i -= currec->length - curbyt + 1;
curbyt = 0;
currec = currec->next;
}
}
else
{
i = -prepeat;
while(curbyt < i)
{
i -= curbyt + 1;
if(currec->prev == BASE)
return(0);
currec = currec->prev;
curbyt = currec->length;
}
}
return(prepeat);
}