LCOV - code coverage report
Current view: top level - lib - bsearch.c (source / functions) Hit Total Coverage
Test: gcov_data_raspi2_real_modules_combined.info Lines: 10 10 100.0 %
Date: 2020-09-30 20:25:40 Functions: 1 1 100.0 %
Branches: 6 6 100.0 %

           Branch data     Line data    Source code
       1                 :            : // SPDX-License-Identifier: GPL-2.0-only
       2                 :            : /*
       3                 :            :  * A generic implementation of binary search for the Linux kernel
       4                 :            :  *
       5                 :            :  * Copyright (C) 2008-2009 Ksplice, Inc.
       6                 :            :  * Author: Tim Abbott <tabbott@ksplice.com>
       7                 :            :  */
       8                 :            : 
       9                 :            : #include <linux/export.h>
      10                 :            : #include <linux/bsearch.h>
      11                 :            : #include <linux/kprobes.h>
      12                 :            : 
      13                 :            : /*
      14                 :            :  * bsearch - binary search an array of elements
      15                 :            :  * @key: pointer to item being searched for
      16                 :            :  * @base: pointer to first element to search
      17                 :            :  * @num: number of elements
      18                 :            :  * @size: size of each element
      19                 :            :  * @cmp: pointer to comparison function
      20                 :            :  *
      21                 :            :  * This function does a binary search on the given array.  The
      22                 :            :  * contents of the array should already be in ascending sorted order
      23                 :            :  * under the provided comparison function.
      24                 :            :  *
      25                 :            :  * Note that the key need not have the same type as the elements in
      26                 :            :  * the array, e.g. key could be a string and the comparison function
      27                 :            :  * could compare the string with the struct's name field.  However, if
      28                 :            :  * the key and elements in the array are of the same type, you can use
      29                 :            :  * the same comparison function for both sort() and bsearch().
      30                 :            :  */
      31                 :   10732782 : void *bsearch(const void *key, const void *base, size_t num, size_t size,
      32                 :            :               int (*cmp)(const void *key, const void *elt))
      33                 :            : {
      34                 :            :         const char *pivot;
      35                 :            :         int result;
      36                 :            : 
      37         [ +  + ]:   46472991 :         while (num > 0) {
      38                 :   25884447 :                 pivot = base + (num >> 1) * size;
      39                 :   25884447 :                 result = cmp(key, pivot);
      40                 :            : 
      41         [ +  + ]:   25883952 :                 if (result == 0)
      42                 :     876525 :                         return (void *)pivot;
      43                 :            : 
      44         [ +  + ]:   25007427 :                 if (result > 0) {
      45                 :   11774761 :                         base = pivot + size;
      46                 :   11774761 :                         num--;
      47                 :            :                 }
      48                 :   25007427 :                 num >>= 1;
      49                 :            :         }
      50                 :            : 
      51                 :            :         return NULL;
      52                 :            : }
      53                 :            : EXPORT_SYMBOL(bsearch);
      54                 :            : NOKPROBE_SYMBOL(bsearch);

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