bsearch
Syntax
Array
Search
#include
<stdlib.h>
void
*bsearch(key,
base,
nmemb,
size,
compar)
void
*key,
*base;
size_t
nrnemb,
size;
int
(*cornpar){);
Defined
in
bsearch.
c in
rts.
src
Description
The bsearch function searches through
an
array
of
nmemb objects for a
member that matches the object that
key
points to. Argument
base
points
to
the first member in the array;
size
specifies the size (in bytes)
of
each
member.
6-26
The contents
of
the array must
be
in
ascending, sorted order.
If
a match
is
found, the function returns a pointer
to
the matching member
of
the array;
if
no match
is
found, the function returns a null pointer
(0).
Argument
cornpar
points
to
a function that compares
key
to the array el-
ements. The comparison function should
be
declared
as:
int
cmp(ptrl,
ptr2)
void
*ptrl,
*ptr2;
The cmp function compares the objects that
ptrl
and
ptr2
point to, and
returns one
of
the
following
values:
< 0
if
*ptrl
is
less
than
*ptr2.
o
if
*ptrl
is
equal
to
*ptr2.
> 0
if
*ptrl
is
greater than
*ptr2.
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