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/* $XTermId: tabs.c,v 1.36 2009/06/21 14:34:17 tom Exp $ */
/*
* Copyright 2000-2008,2009 by Thomas E. Dickey
*
* All Rights Reserved
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE ABOVE LISTED COPYRIGHT HOLDER(S) BE LIABLE FOR ANY
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
* Except as contained in this notice, the name(s) of the above copyright
* holders shall not be used in advertising or otherwise to promote the
* sale, use or other dealings in this Software without prior written
* authorization.
*
* Copyright 1987 by Digital Equipment Corporation, Maynard, Massachusetts.
*
* All Rights Reserved
*
* Permission to use, copy, modify, and distribute this software and its
* documentation for any purpose and without fee is hereby granted,
* provided that the above copyright notice appear in all copies and that
* both that copyright notice and this permission notice appear in
* supporting documentation, and that the name of Digital Equipment
* Corporation not be used in advertising or publicity pertaining to
* distribution of the software without specific, written prior permission.
*
*
* DIGITAL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
* ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
* DIGITAL BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
* ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
* WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
* ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
* SOFTWARE.
*/
/* tabs.c */
#include <xterm.h>
#include <data.h>
#define TAB_INDEX(n) ((n) >> TAB_BITS_SHIFT)
#define TAB_MASK(n) (1 << ((n) & (TAB_BITS_WIDTH-1)))
#define SET_TAB(tabs,n) tabs[TAB_INDEX(n)] |= TAB_MASK(n)
#define CLR_TAB(tabs,n) tabs[TAB_INDEX(n)] &= ~TAB_MASK(n)
#define TST_TAB(tabs,n) tabs[TAB_INDEX(n)] & TAB_MASK(n)
/*
* places tabstops at only every 8 columns
*/
void
TabReset(Tabs tabs)
{
int i;
TabZonk(tabs);
for (i = 0; i < MAX_TABS; i += 8)
TabSet(tabs, i);
}
/*
* places a tabstop at col
*/
void
TabSet(Tabs tabs, int col)
{
if (col >= 0 && col < MAX_TABS) {
SET_TAB(tabs, col);
}
}
/*
* clears a tabstop at col
*/
void
TabClear(Tabs tabs, int col)
{
if (col >= 0 && col < MAX_TABS) {
CLR_TAB(tabs, col);
}
}
/*
* returns the column of the next tabstop
* (or MAX_TABS - 1 if there are no more).
* A tabstop at col is ignored.
*/
static int
TabNext(XtermWidget xw, Tabs tabs, int col)
{
TScreen *screen = &(xw->screen);
if (screen->curses && screen->do_wrap && (xw->flags & WRAPAROUND)) {
xtermIndex(xw, 1);
set_cur_col(screen, 0);
col = 0;
screen->do_wrap = False;
}
for (++col; col < MAX_TABS; ++col)
if (TST_TAB(tabs, col))
return (col);
return (MAX_TABS - 1);
}
/*
* returns the column of the previous tabstop
* (or 0 if there are no more).
* A tabstop at col is ignored.
*/
static int
TabPrev(Tabs tabs, int col)
{
for (--col; col >= 0; --col)
if ((col < MAX_TABS) && TST_TAB(tabs, col))
return (col);
return (0);
}
/*
* Tab to the next stop, returning true if the cursor moved
*/
Bool
TabToNextStop(XtermWidget xw)
{
TScreen *screen = &(xw->screen);
int saved_column = screen->cur_col;
int next = TabNext(xw, xw->tabs, screen->cur_col);
int max = LineMaxCol(screen, getLineData(screen, screen->cur_row));
if (next > max)
next = max;
set_cur_col(screen, next);
return (screen->cur_col > saved_column);
}
/*
* Tab to the previous stop, returning true if the cursor moved
*/
Bool
TabToPrevStop(XtermWidget xw)
{
TScreen *screen = &(xw->screen);
int saved_column = screen->cur_col;
set_cur_col(screen, TabPrev(xw->tabs, screen->cur_col));
return (screen->cur_col < saved_column);
}
/*
* clears all tabs
*/
void
TabZonk(Tabs tabs)
{
memset(tabs, 0, sizeof(*tabs) * TAB_ARRAY_SIZE);
}
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