/* * $XFree86: xc/programs/xterm/tabs.c,v 3.12 2005/04/22 00:21:54 dickey Exp $ */ /* $Xorg: tabs.c,v 1.3 2000/08/17 19:55:09 cpqbld Exp $ */ /* * Copyright 2000-2002,2005 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> /* * 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) & (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; 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 tabs, int col) { SET_TAB(tabs, col); } /* * clears a tabstop at col */ void TabClear(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. */ static int TabNext(TScreen * screen, Tabs tabs, int col) { if (screen->curses && screen->do_wrap && (term->flags & WRAPAROUND)) { xtermIndex(screen, 1); set_cur_col(screen, 0); 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. */ static int TabPrev(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 */ Bool TabToNextStop(TScreen * screen) { int saved_column = screen->cur_col; int next = TabNext(screen, term->tabs, screen->cur_col); int max = CurMaxCol(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(TScreen * screen) { int saved_column = screen->cur_col; set_cur_col(screen, TabPrev(term->tabs, screen->cur_col)); return (screen->cur_col < saved_column); } /* * clears all tabs */ void TabZonk(Tabs tabs) { int i; for (i = 0; i < TAB_ARRAY_SIZE; ++i) tabs[i] = 0; }