Originální popis anglicky:
calloc - a memory allocator
Návod, kniha: POSIX Programmer's Manual
#include <stdlib.h>
void *calloc(size_t
nelem, size_t
elsize );
The
calloc() function shall allocate unused space for an array of
nelem elements each of whose size in bytes is
elsize. The space
shall be initialized to all bits 0.
The order and contiguity of storage allocated by successive calls to
calloc() is unspecified. The pointer returned if the allocation
succeeds shall be suitably aligned so that it may be assigned to a pointer to
any type of object and then used to access such an object or an array of such
objects in the space allocated (until the space is explicitly freed or
reallocated). Each such allocation shall yield a pointer to an object disjoint
from any other object. The pointer returned shall point to the start (lowest
byte address) of the allocated space. If the space cannot be allocated, a null
pointer shall be returned. If the size of the space requested is 0, the
behavior is implementation-defined: the value returned shall be either a null
pointer or a unique pointer.
Upon successful completion with both
nelem and
elsize non-zero,
calloc() shall return a pointer to the allocated space. If either
nelem or
elsize is 0, then either a null pointer or a unique
pointer value that can be successfully passed to
free() shall be
returned. Otherwise, it shall return a null pointer and set
errno to indicate the error.
The
calloc() function shall fail if:
- ENOMEM
- Insufficient memory is available.
The following sections are informative.
None.
There is now no requirement for the implementation to support the inclusion of
<malloc.h>.
None.
None.
free() ,
malloc() ,
realloc() , the Base Definitions volume
of IEEE Std 1003.1-2001,
<stdlib.h>
Portions of this text are reprinted and reproduced in electronic form from IEEE
Std 1003.1, 2003 Edition, Standard for Information Technology -- Portable
Operating System Interface (POSIX), The Open Group Base Specifications Issue
6, Copyright (C) 2001-2003 by the Institute of Electrical and Electronics
Engineers, Inc and The Open Group. In the event of any discrepancy between
this version and the original IEEE and The Open Group Standard, the original
IEEE and The Open Group Standard is the referee document. The original
Standard can be obtained online at http://www.opengroup.org/unix/online.html
.
