/**************************************************************************** * apps/graphics/pdcurses/pdc_scroll.c * Public Domain Curses * RCSID("$Id: scroll.c,v 1.36 2008/07/13 16:08:18 wmcbrine Exp $") * * Copyright (C) 2017 Gregory Nutt. All rights reserved. * Adapted by: Gregory Nutt * * Adapted from the original public domain pdcurses by Gregory Nutt and * released as part of NuttX under the 3-clause BSD license: * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * 3. Neither the name NuttX nor the names of its contributors may be * used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. * ****************************************************************************/ /* Name: scroll * * Synopsis: * int scroll(WINDOW *win); * int scrl(int n); * int wscrl(WINDOW *win, int n); * * Description: * scroll() causes the window to scroll up one line. This involves * moving the lines in the window data strcture. * * With a positive n, scrl() and wscrl() scroll the window up n * lines (line i + n becomes i); otherwise they scroll the window * down n lines. * For these functions to work, scrolling must be enabled via * scrollok(). Note also that scrolling is not allowed if the * supplied window is a pad. * * Return Value: * All functions return OK on success and ERR on error. * * Portability X/Open BSD SYS V * scroll Y Y Y * scrl Y - 4.0 * wscrl Y - 4.0 */ /**************************************************************************** * Included Files ****************************************************************************/ #include "curspriv.h" /**************************************************************************** * Public Functions ****************************************************************************/ int wscrl(WINDOW *win, int n) { chtype blank; chtype *temp; int dir; int start; int end; int l; int i; /* Check if window scrolls. Valid for window AND pad */ if (!win || !win->_scroll || !n) { return ERR; } blank = win->_bkgd; if (n > 0) { start = win->_tmarg; end = win->_bmarg; dir = 1; } else { start = win->_bmarg; end = win->_tmarg; dir = -1; } for (l = 0; l < (n * dir); l++) { temp = win->_y[start]; /* Re-arrange line pointers */ for (i = start; i != end; i += dir) { win->_y[i] = win->_y[i + dir]; } win->_y[end] = temp; /* Make a blank line */ for (i = 0; i < win->_maxx; i++) { *temp++ = blank; } } touchline(win, win->_tmarg, win->_bmarg - win->_tmarg + 1); PDC_sync(win); return OK; } int scrl(int n) { #ifdef CONFIG_PDCURSES_MULTITHREAD FAR struct pdc_context_s *ctx = PDC_ctx(); #endif PDC_LOG(("scrl() - called\n")); return wscrl(stdscr, n); } int scroll(WINDOW *win) { PDC_LOG(("scroll() - called\n")); return wscrl(win, 1); }