1b902641d7303d2ea24c10f6d6e7ff49e7ee75611Elliott Hughes/* $OpenBSD: lsearch.c,v 1.5 2014/07/18 04:16:09 matthew Exp $ */ 2b902641d7303d2ea24c10f6d6e7ff49e7ee75611Elliott Hughes 37f3a272ae327c647db4caeaea2a3c7af50bd73b5Elliott Hughes/* 47f3a272ae327c647db4caeaea2a3c7af50bd73b5Elliott Hughes * Copyright (c) 1989, 1993 57f3a272ae327c647db4caeaea2a3c7af50bd73b5Elliott Hughes * The Regents of the University of California. All rights reserved. 67f3a272ae327c647db4caeaea2a3c7af50bd73b5Elliott Hughes * 77f3a272ae327c647db4caeaea2a3c7af50bd73b5Elliott Hughes * This code is derived from software contributed to Berkeley by 87f3a272ae327c647db4caeaea2a3c7af50bd73b5Elliott Hughes * Roger L. Snyder. 97f3a272ae327c647db4caeaea2a3c7af50bd73b5Elliott Hughes * 107f3a272ae327c647db4caeaea2a3c7af50bd73b5Elliott Hughes * Redistribution and use in source and binary forms, with or without 117f3a272ae327c647db4caeaea2a3c7af50bd73b5Elliott Hughes * modification, are permitted provided that the following conditions 127f3a272ae327c647db4caeaea2a3c7af50bd73b5Elliott Hughes * are met: 137f3a272ae327c647db4caeaea2a3c7af50bd73b5Elliott Hughes * 1. Redistributions of source code must retain the above copyright 147f3a272ae327c647db4caeaea2a3c7af50bd73b5Elliott Hughes * notice, this list of conditions and the following disclaimer. 157f3a272ae327c647db4caeaea2a3c7af50bd73b5Elliott Hughes * 2. Redistributions in binary form must reproduce the above copyright 167f3a272ae327c647db4caeaea2a3c7af50bd73b5Elliott Hughes * notice, this list of conditions and the following disclaimer in the 177f3a272ae327c647db4caeaea2a3c7af50bd73b5Elliott Hughes * documentation and/or other materials provided with the distribution. 187f3a272ae327c647db4caeaea2a3c7af50bd73b5Elliott Hughes * 3. Neither the name of the University nor the names of its contributors 197f3a272ae327c647db4caeaea2a3c7af50bd73b5Elliott Hughes * may be used to endorse or promote products derived from this software 207f3a272ae327c647db4caeaea2a3c7af50bd73b5Elliott Hughes * without specific prior written permission. 217f3a272ae327c647db4caeaea2a3c7af50bd73b5Elliott Hughes * 227f3a272ae327c647db4caeaea2a3c7af50bd73b5Elliott Hughes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 237f3a272ae327c647db4caeaea2a3c7af50bd73b5Elliott Hughes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 247f3a272ae327c647db4caeaea2a3c7af50bd73b5Elliott Hughes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 257f3a272ae327c647db4caeaea2a3c7af50bd73b5Elliott Hughes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 267f3a272ae327c647db4caeaea2a3c7af50bd73b5Elliott Hughes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 277f3a272ae327c647db4caeaea2a3c7af50bd73b5Elliott Hughes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 287f3a272ae327c647db4caeaea2a3c7af50bd73b5Elliott Hughes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 297f3a272ae327c647db4caeaea2a3c7af50bd73b5Elliott Hughes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 307f3a272ae327c647db4caeaea2a3c7af50bd73b5Elliott Hughes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 317f3a272ae327c647db4caeaea2a3c7af50bd73b5Elliott Hughes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 327f3a272ae327c647db4caeaea2a3c7af50bd73b5Elliott Hughes * SUCH DAMAGE. 337f3a272ae327c647db4caeaea2a3c7af50bd73b5Elliott Hughes */ 347f3a272ae327c647db4caeaea2a3c7af50bd73b5Elliott Hughes 357f3a272ae327c647db4caeaea2a3c7af50bd73b5Elliott Hughes#include <sys/types.h> 367f3a272ae327c647db4caeaea2a3c7af50bd73b5Elliott Hughes#include <string.h> 377f3a272ae327c647db4caeaea2a3c7af50bd73b5Elliott Hughes#include <search.h> 387f3a272ae327c647db4caeaea2a3c7af50bd73b5Elliott Hughes 397f3a272ae327c647db4caeaea2a3c7af50bd73b5Elliott Hughestypedef int (*cmp_fn_t)(const void *, const void *); 40b902641d7303d2ea24c10f6d6e7ff49e7ee75611Elliott Hughesstatic void *linear_base(const void *, const void *, size_t *, size_t, 41b902641d7303d2ea24c10f6d6e7ff49e7ee75611Elliott Hughes cmp_fn_t, int); 427f3a272ae327c647db4caeaea2a3c7af50bd73b5Elliott Hughes 437f3a272ae327c647db4caeaea2a3c7af50bd73b5Elliott Hughesvoid * 447f3a272ae327c647db4caeaea2a3c7af50bd73b5Elliott Hugheslsearch(const void *key, void *base, size_t *nelp, size_t width, 45b902641d7303d2ea24c10f6d6e7ff49e7ee75611Elliott Hughes cmp_fn_t compar) 467f3a272ae327c647db4caeaea2a3c7af50bd73b5Elliott Hughes{ 477f3a272ae327c647db4caeaea2a3c7af50bd73b5Elliott Hughes 487f3a272ae327c647db4caeaea2a3c7af50bd73b5Elliott Hughes return(linear_base(key, base, nelp, width, compar, 1)); 497f3a272ae327c647db4caeaea2a3c7af50bd73b5Elliott Hughes} 507f3a272ae327c647db4caeaea2a3c7af50bd73b5Elliott Hughes 517f3a272ae327c647db4caeaea2a3c7af50bd73b5Elliott Hughesvoid * 527f3a272ae327c647db4caeaea2a3c7af50bd73b5Elliott Hugheslfind(const void *key, const void *base, size_t *nelp, size_t width, 53b902641d7303d2ea24c10f6d6e7ff49e7ee75611Elliott Hughes cmp_fn_t compar) 547f3a272ae327c647db4caeaea2a3c7af50bd73b5Elliott Hughes{ 55b902641d7303d2ea24c10f6d6e7ff49e7ee75611Elliott Hughes return(linear_base(key, base, nelp, width, compar, 0)); 567f3a272ae327c647db4caeaea2a3c7af50bd73b5Elliott Hughes} 577f3a272ae327c647db4caeaea2a3c7af50bd73b5Elliott Hughes 587f3a272ae327c647db4caeaea2a3c7af50bd73b5Elliott Hughesstatic void * 59b902641d7303d2ea24c10f6d6e7ff49e7ee75611Elliott Hugheslinear_base(const void *key, const void *base, size_t *nelp, size_t width, 607f3a272ae327c647db4caeaea2a3c7af50bd73b5Elliott Hughes cmp_fn_t compar, int add_flag) 617f3a272ae327c647db4caeaea2a3c7af50bd73b5Elliott Hughes{ 62b902641d7303d2ea24c10f6d6e7ff49e7ee75611Elliott Hughes const char *element, *end; 637f3a272ae327c647db4caeaea2a3c7af50bd73b5Elliott Hughes 64b902641d7303d2ea24c10f6d6e7ff49e7ee75611Elliott Hughes end = (const char *)base + *nelp * width; 65b902641d7303d2ea24c10f6d6e7ff49e7ee75611Elliott Hughes for (element = base; element < end; element += width) 66b902641d7303d2ea24c10f6d6e7ff49e7ee75611Elliott Hughes if (!compar(key, element)) /* key found */ 67b902641d7303d2ea24c10f6d6e7ff49e7ee75611Elliott Hughes return((void *)element); 687f3a272ae327c647db4caeaea2a3c7af50bd73b5Elliott Hughes 697f3a272ae327c647db4caeaea2a3c7af50bd73b5Elliott Hughes if (!add_flag) /* key not found */ 707f3a272ae327c647db4caeaea2a3c7af50bd73b5Elliott Hughes return(NULL); 717f3a272ae327c647db4caeaea2a3c7af50bd73b5Elliott Hughes 727f3a272ae327c647db4caeaea2a3c7af50bd73b5Elliott Hughes /* 737f3a272ae327c647db4caeaea2a3c7af50bd73b5Elliott Hughes * The UNIX System User's Manual, 1986 edition claims that 747f3a272ae327c647db4caeaea2a3c7af50bd73b5Elliott Hughes * a NULL pointer is returned by lsearch with errno set 757f3a272ae327c647db4caeaea2a3c7af50bd73b5Elliott Hughes * appropriately, if there is not enough room in the table 767f3a272ae327c647db4caeaea2a3c7af50bd73b5Elliott Hughes * to add a new item. This can't be done as none of these 777f3a272ae327c647db4caeaea2a3c7af50bd73b5Elliott Hughes * routines have any method of determining the size of the 787f3a272ae327c647db4caeaea2a3c7af50bd73b5Elliott Hughes * table. This comment isn't in the 1986-87 System V 797f3a272ae327c647db4caeaea2a3c7af50bd73b5Elliott Hughes * manual. 807f3a272ae327c647db4caeaea2a3c7af50bd73b5Elliott Hughes */ 817f3a272ae327c647db4caeaea2a3c7af50bd73b5Elliott Hughes ++*nelp; 82b902641d7303d2ea24c10f6d6e7ff49e7ee75611Elliott Hughes memcpy((void *)end, key, width); 83b902641d7303d2ea24c10f6d6e7ff49e7ee75611Elliott Hughes return((void *)end); 847f3a272ae327c647db4caeaea2a3c7af50bd73b5Elliott Hughes} 85