1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 /* 23 * Copyright (c) 1995, by Sun Microsystems, Inc. 24 * All rights reserved. 25 */ 26 27 #pragma ident "%Z%%M% %I% %E% SMI" 28 29 /* 30 * wscrl.c 31 * 32 * XCurses Library 33 * 34 * Copyright 1990, 1995 by Mortice Kern Systems Inc. All rights reserved. 35 * 36 */ 37 38 #ifdef M_RCSID 39 #ifndef lint 40 static char rcsID[] = "$Header: /rd/src/libc/xcurses/rcs/wscrl.c 1.4 1995/07/26 17:43:20 ant Exp $"; 41 #endif 42 #endif 43 44 #include <private.h> 45 #include <string.h> 46 47 /*f 48 * For positive n scroll the window up n lines (line i+n becomes i); 49 * otherwise scroll the window down n lines. 50 */ 51 int 52 wscrl(w, n) 53 WINDOW *w; 54 int n; 55 { 56 int y, x, width, start, finish, to; 57 58 #ifdef M_CURSES_TRACE 59 __m_trace("wscrl(%p, %d)", w, n); 60 #endif 61 62 if (n == 0) 63 return __m_return_code("wscrl", OK); 64 65 /* Shuffle pointers in order to scroll. The region 66 * from start to finish inclusive will be moved to 67 * either the top or bottom of _line[]. 68 */ 69 if (0 < n) { 70 start = w->_top; 71 finish = w->_top + n - 1; 72 to = w->_bottom; 73 } else { 74 start = w->_bottom + n; 75 finish = w->_bottom - 1; 76 to = w->_top; 77 } 78 79 /* Blank out new lines. */ 80 if (__m_cc_erase(w, start, 0, finish, w->_maxx-1) == -1) 81 return __m_return_code("wscrl", ERR); 82 83 /* Scroll lines by shuffling pointers. */ 84 (void) __m_ptr_move((void **) w->_line, w->_maxy, start, finish, to); 85 86 if ((w->_flags & W_FULL_WINDOW) 87 && w->_top == 0 && w->_bottom == w->_maxy) 88 w->_scroll += n; 89 else 90 w->_scroll = 0; 91 92 (void) wtouchln(w, 0, w->_maxy, 1); 93 94 WSYNC(w); 95 96 return __m_return_code("wscrl", WFLUSH(w)); 97 } 98