FUNCTION <>---sort an array INDEX qsort ANSI_SYNOPSIS #include void qsort(void *<[base]>, size_t <[nmemb]>, size_t <[size]>, int (*<[compar]>)(const void *, const void *) ); TRAD_SYNOPSIS #include qsort(<[base]>, <[nmemb]>, <[size]>, <[compar]> ) char *<[base]>; size_t <[nmemb]>; size_t <[size]>; int (*<[compar]>)(); DESCRIPTION <> sorts an array (beginning at <[base]>) of <[nmemb]> objects. <[size]> describes the size of each element of the array. You must supply a pointer to a comparison function, using the argument shown as <[compar]>. (This permits sorting objects of unknown properties.) Define the comparison function to accept two arguments, each a pointer to an element of the array starting at <[base]>. The result of <<(*<[compar]>)>> must be negative if the first argument is less than the second, zero if the two arguments match, and positive if the first argument is greater than the second (where ``less than'' and ``greater than'' refer to whatever arbitrary ordering is appropriate). The array is sorted in place; that is, when <> returns, the array elements beginning at <[base]> have been reordered. RETURNS <> does not return a result. PORTABILITY <> is required by ANSI (without specifying the sorting algorithm). */ /*- * Copyright (c) 1992, 1993 * The Regents of the University of California. All rights reserved. * * 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. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University 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 REGENTS 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 REGENTS 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. */