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/*
* $XConsortium: tabs.c,v 1.4 91/05/06 17:12:18 gildea Exp $
* $XFree86: xc/programs/xterm/tabs.c,v 3.2.4.2 1998/02/15 16:10:10 hohndel Exp $
*/
/*
* 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 */
#ifdef HAVE_CONFIG_H
#include <xtermcfg.h>
#endif
#include "ptyx.h"
#include "xterm.h"
extern XtermWidget term;
/*
* This file presumes 32bits/word. This is somewhat of a crock, and should
* be fixed sometime.
*/
#define TAB_INDEX(n) ((n) >> 5)
#define TAB_MASK(n) (1 << ((n) & 31))
#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 tabs;
{
register int i;
for (i=0; i<TAB_ARRAY_SIZE; ++i)
tabs[i] = 0;
for (i=0; i<MAX_TABS; i+=8)
TabSet(tabs, i);
}
/*
* places a tabstop at col
*/
void
TabSet(tabs, col)
Tabs tabs;
int col;
{
SET_TAB(tabs,col);
}
/*
* clears a tabstop at col
*/
void
TabClear(tabs, col)
Tabs tabs;
int col;
{
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.
*/
int
TabNext (tabs, col)
Tabs tabs;
int col;
{
register TScreen *screen = &term->screen;
if(screen->curses && screen->do_wrap && (term->flags & WRAPAROUND)) {
Index(screen, 1);
col = screen->cur_col = screen->do_wrap = 0;
}
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.
*/
int
TabPrev (tabs, col)
Tabs tabs;
int col;
{
for (--col; col >= 0; --col)
if (TST_TAB(tabs,col))
return (col);
return (0);
}
/*
* Tab to the next stop, returning true if the cursor moved
*/
Boolean
TabToNextStop()
{
register TScreen *screen = &term->screen;
int saved_column = screen->cur_col;
screen->cur_col = TabNext(term->tabs, screen->cur_col);
if (screen->cur_col > CurMaxCol(screen, screen->cur_row))
screen->cur_col = CurMaxCol(screen, screen->cur_row);
return (screen->cur_col > saved_column);
}
/*
* Tab to the previous stop, returning true if the cursor moved
*/
Boolean
TabToPrevStop()
{
register TScreen *screen = &term->screen;
int saved_column = screen->cur_col;
screen->cur_col = TabPrev(term->tabs, screen->cur_col);
return (screen->cur_col < saved_column);
}
/*
* clears all tabs
*/
void
TabZonk (tabs)
Tabs tabs;
{
register int i;
for (i=0; i<TAB_ARRAY_SIZE; ++i)
tabs[i] = 0;
}
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