bsearch(3) [redhat man page]

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)

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 referenced 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