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BSEARCH(3)               BSD Library Functions Manual               BSEARCH(3)

NAME
     bsearch, bsearch_b -- binary search of a sorted table

SYNOPSIS
     #include <stdlib.h>

     void *
     bsearch(const void *key, const void *base, size_t nel, size_t width,
         int (*compar) (const void *, const void *));

     void *
     bsearch_b(const void *key, const void *base, size_t nel, size_t width,
         int (^compar) (const void *, const void *));

DESCRIPTION
     The bsearch() function searches an array of nel objects, the initial member of which is pointed to by
     base, for a member that matches the object pointed to by key.  The size (in bytes) of each member of
     the array is specified by width.

     The contents of the array should be in ascending sorted order according to the comparison function ref-erenced referenced
     erenced by compar.  The compar routine is expected to have two arguments which point to the key object
     and to an array member, in that order.  It should return an integer which is less than, equal to, or
     greater than zero if the key object is found, respectively, to be less than, to match, or be greater
     than the array member.

     The bsearch_b() function is like bsearch() except the callback compar is a block pointer instead of a
     function pointer.

RETURN VALUES
     The bsearch() and bsearch_b() functions returns a pointer to a matching member of the array, or a null
     pointer if no match is found.  If two members compare as equal, which member is matched is unspecified.

SEE ALSO
     db(3), lsearch(3), qsort(3)

STANDARDS
     The bsearch() function conforms to ISO/IEC 9899:1990 (``ISO C90'').

BSD                              May 20, 2008                              BSD