redhat man page for bsearch

BSEARCH(3)						     Linux Programmer's Manual							BSEARCH(3)

NAME
       bsearch - binary search of a sorted array.

SYNOPSIS
       #include <stdlib.h>

       void *bsearch(const void *key, const void *base, size_t nmemb,
	      size_t size, int (*compar)(const void *, const void *));

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

       The contents of the array should be in ascending sorted order according to the comparison function referenced by compar.  The  compar  rou-
       tine  is  expected  to have two arguments which point to the key object and to an array member, in that order, and should return an integer
       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.

RETURN VALUE
       The  bsearch()  function returns a pointer to a matching member of the array, or NULL if no match is found.  If there are multiple elements
       that match the key, the element returned is unspecified.

CONFORMING TO
       SVID 3, BSD 4.3, ISO 9899 (C99)

SEE ALSO
       qsort(3)

GNU
								    1993-03-29								BSEARCH(3)