perform a linear search for
key in the array base which has *nmemb elements of
size bytes each.
The comparison function referenced by
compar is expected to have two arguments which point to the
key object and to an array member, in that order, and which
returns zero if the key object matches the array member, and
does not find a matching element, then the key
object is inserted at the end of the table, and *nmemb is
In particular, one should know that a matching element
exists, or that more room is available.
returns a pointer to a matching member of the array, or
NULL if no match is found.
returns a pointer to
a matching member of the array, or to the newly added member if no
match is found.
SVr4, 4.3BSD, POSIX.1-2001.
Present in libc since libc-4.6.27.