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) 1995-1998 by Sun Microsystems, Inc. 24 * All rights reserved. 25 */ 26 27 /* LINTLIBRARY */ 28 29 /* 30 * ptrmove.c 31 * 32 * Copyright 1990, 1995 by Mortice Kern Systems Inc. All rights reserved. 33 * 34 */ 35 36 #ifdef M_RCSID 37 #ifndef lint 38 static char rcsID[] = "$Header: /rd/src/libc/xcurses/rcs/ptrmove.c 1.3 " 39 "1995/05/18 20:55:05 ant Exp $"; 40 #endif 41 #endif 42 43 #include <private.h> 44 45 static void reverse(void **, unsigned int, unsigned int); 46 47 /* 48 * Move range start..finish inclusive before the given location. 49 * Return -1 if the region to move is out of bounds or the target 50 * falls within the region; 0 for success. 51 * 52 * (See Software Tools chapter 6.) 53 */ 54 int 55 __m_ptr_move(void **array, unsigned int length, 56 unsigned int start, unsigned int finish, unsigned int to) 57 { 58 if (finish < start || length <= finish) 59 return (-1); 60 61 if (to < start) { 62 reverse(array, to, start-1); 63 reverse(array, start, finish); 64 reverse(array, to, finish); 65 } else if (finish < to && to <= length) { 66 reverse(array, start, finish); 67 reverse(array, finish+1, to-1); 68 reverse(array, start, to-1); 69 } else { 70 return (-1); 71 } 72 73 return (0); 74 } 75 76 /* 77 * Reverse range a..b inclusive. 78 */ 79 static void 80 reverse(void **ptr, unsigned int a, unsigned int b) 81 { 82 void *temp; 83 void **a_ptr = &ptr[a]; 84 void **b_ptr = &ptr[b]; 85 86 while (a_ptr < b_ptr) { 87 temp = *a_ptr; 88 *a_ptr++ = *b_ptr; 89 *b_ptr-- = temp; 90 } 91 } 92