| /* |
| ** License Applicability. Except to the extent portions of this file are |
| ** made subject to an alternative license as permitted in the SGI Free |
| ** Software License B, Version 1.1 (the "License"), the contents of this |
| ** file are subject only to the provisions of the License. You may not use |
| ** this file except in compliance with the License. You may obtain a copy |
| ** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600 |
| ** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at: |
| ** |
| ** http://oss.sgi.com/projects/FreeB |
| ** |
| ** Note that, as provided in the License, the Software is distributed on an |
| ** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS |
| ** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND |
| ** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A |
| ** PARTICULAR PURPOSE, AND NON-INFRINGEMENT. |
| ** |
| ** Original Code. The Original Code is: OpenGL Sample Implementation, |
| ** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics, |
| ** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc. |
| ** Copyright in any portions created by third parties is as indicated |
| ** elsewhere herein. All Rights Reserved. |
| ** |
| ** Additional Notice Provisions: The application programming interfaces |
| ** established by SGI in conjunction with the Original Code are The |
| ** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released |
| ** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version |
| ** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X |
| ** Window System(R) (Version 1.3), released October 19, 1998. This software |
| ** was created using the OpenGL(R) version 1.2.1 Sample Implementation |
| ** published by SGI, but has not been independently verified as being |
| ** compliant with the OpenGL(R) version 1.2.1 Specification. |
| ** |
| ** $Date: 2012/03/29 17:22:17 $ $Revision: 1.1.1.1 $ |
| */ |
| /* |
| ** $Header: /cvs/bao-parsec/pkgs/libs/mesa/src/src/glu/sgi/libnurbs/nurbtess/quicksort.cc,v 1.1.1.1 2012/03/29 17:22:17 uid42307 Exp $ |
| */ |
| |
| #include <stdlib.h> |
| #include <stdio.h> |
| |
| |
| static void swap(void *v[], int i, int j) |
| { |
| void *temp; |
| temp = v[i]; |
| v[i] = v[j]; |
| v[j] = temp; |
| } |
| |
| /*as an example to use this function to |
| *sort integers, you need to supply the function |
| *int comp(int *i1, int *i2) |
| *{ |
| * if( *i1 < * i2) return -1; |
| * else return 1; |
| *} |
| *and an array of pointers to integers: |
| * int *v[100] (allocate space for where each v[i] points to). |
| *then you can call: |
| * quicksort( (void**)v, left, right, (int (*)(void *, void *))comp) |
| */ |
| void quicksort(void *v[], int left, int right, |
| int (*comp) (void *, void *)) |
| { |
| int i, last; |
| if(left >= right) /*do nothing if array contains */ |
| return; /*fewer than two elements*/ |
| |
| swap(v, left, (left+right)/2); |
| last = left; |
| for(i=left+1; i<=right; i++) |
| if((*comp)(v[i], v[left])<0) |
| swap(v, ++last, i); |
| swap(v, left, last); |
| quicksort(v, left, last-1, comp); |
| quicksort(v, last+1, right, comp); |
| } |