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lib/bsearch.c
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/* * A generic implementation of binary search for the Linux kernel * * Copyright (C) 2008-2009 Ksplice, Inc. * Author: Tim Abbott <tabbott@ksplice.com> * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as * published by the Free Software Foundation; version 2. */ |
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#include <linux/export.h> |
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#include <linux/bsearch.h> /* * bsearch - binary search an array of elements * @key: pointer to item being searched for * @base: pointer to first element to search * @num: number of elements * @size: size of each element * @cmp: pointer to comparison function * * This function does a binary search on the given array. The * contents of the array should already be in ascending sorted order * under the provided comparison function. * * Note that the key need not have the same type as the elements in * the array, e.g. key could be a string and the comparison function * could compare the string with the struct's name field. However, if * the key and elements in the array are of the same type, you can use * the same comparison function for both sort() and bsearch(). */ void *bsearch(const void *key, const void *base, size_t num, size_t size, int (*cmp)(const void *key, const void *elt)) { |
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const char *pivot; |
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int result; |
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while (num > 0) { pivot = base + (num >> 1) * size; result = cmp(key, pivot); |
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if (result == 0) return (void *)pivot; if (result > 0) { base = pivot + size; num--; } num >>= 1; |
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} return NULL; } EXPORT_SYMBOL(bsearch); |