BSEARCH(3) Linux Programmer's Manual BSEARCH(3)
bsearch - binary search of a sorted array.
void *bsearch(const void *key, const void *base, size_t nmemb,
size_t size, int (*compar)(const void *, const void *));
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 routine is expected to have two arguments which
point to the key object and to an array member, in that order, and should return an inte-
ger 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() 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
SVID 3, BSD 4.3, ISO 9899 (C99)
GNU 1993-03-29 BSEARCH(3)