.TH LIBSIMPLE_ALIGNED_REALLOC 3 libsimple
.SH NAME
libsimple_aligned_realloc \- reallocate memory and customise alignment

.SH SYNOPSIS
.nf
#include <libsimple.h>

inline void *libsimple_aligned_realloc(void *\fIptr\fP, size_t \fIalignment\fP, size_t \fIn\fP);
void *libsimple_enaligned_realloc(int \fIstatus\fP, void *\fIptr\fP, size_t \fIalignment\fP, size_t \fIn\fP);
inline void *libsimple_ealigned_realloc(void *\fIptr\fP, size_t \fIalignment\fP, size_t \fIn\fP);

#ifndef aligned_realloc
# define aligned_realloc libsimple_aligned_realloc
#endif
#ifndef enaligned_realloc
# define enaligned_realloc libsimple_enaligned_realloc
#endif
#ifndef ealigned_realloc
# define ealigned_realloc libsimple_ealigned_realloc
#endif
.fi
.PP
Link with
.IR \-lsimple .

.SH DESCRIPTION
The
.BR libsimple_aligned_realloc (),
.BR libsimple_enaligned_realloc (),
and
.BR libsimple_ealigned_realloc ()
functions reallocate memory allocated on
the heap and return the older pointer or a new
pointer with the alignment of
.I alignment
to the allocated memory of 
.I n
bytes. The behaviour is unspecified if
.I n
is 0. The returned pointer will contain the
same content as
.IR ptr ,
but truncated to
.I n
bytes if it is smaller or with the new bytes
uninitialised if it is larger. If a new pointer
is returned, rather than
.IR ptr ,
.I ptr
is deallocated;
.I ptr
is not deallocated on failure. The function
.BR free (3)
shall be called with the returned pointer as
input when the allocated memory is no longer needed.
.PP
The
.BR libsimple_enaligned_realloc ()
and
.BR libsimple_ealigned_realloc ()
functions will terminate the process if the memory
cannot be allocated, by calling the
.BR libsimple_enprintf ()
and
.BR libsimple_eprintf ()
functions, respectively.
On failure, the process's exit value will be
.I status
if the
.BR libsimple_enaligned_realloc ()
function is used or
.IR libsimple_default_failure_exit (3)
if the
.BR libsimple_ealigned_realloc ()
function is used.

.SH RETURN VALUE
The
.BR libsimple_aligned_realloc (),
.BR libsimple_enaligned_realloc (),
and
.BR libsimple_ealigned_realloc ()
functions return a pointer to the allocated memory
upon success completion; otherwise the
.BR libsimple_aligned_realloc ()
function returns
.B NULL
and set
.I errno
it indicate the error, and the
.BR libsimple_enaligned_realloc ()
and
.BR libsimple_ealigned_realloc ()
functions terminated the process.

.SH ERRORS
The
.BR libsimple_aligned_realloc ()
function will fail for the reasons specified for the
.BR realloc (3)
function, and if:
.TP
.B EINVAL
.I alignment
is an invalid alignment (usually it needs to be an power of 2).
.TP
.B ENOSYS
The function is not implemented. The function requires
non-standard libc functions, and is therefore not supported
for all libc implementations.

The function is implemented if and only if the macro
.B LIBSIMPLE_HAVE_ALIGNED_REALLOC
is defined by the library.
.PP
The
.BR libsimple_enaligned_realloc ()
and
.BR libsimple_ealigned_realloc ()
functions will terminate the process on failure.

.SH ATTRIBUTES
For an explanation of the terms used in this section, see
.BR attributes (7).
.TS
allbox;
lb lb lb
l l l.
Interface	Attribute	Value
T{
.BR libsimple_aligned_realloc (),
.br
.BR libsimple_enaligned_realloc (),
.br
.BR libsimple_ealigned_realloc ()
T}	Thread safety	MT-Safe
T{
.BR libsimple_aligned_realloc (),
.br
.BR libsimple_enaligned_realloc (),
.br
.BR libsimple_ealigned_realloc ()
T}	Async-signal safety	AS-Safe
T{
.BR libsimple_aligned_realloc (),
.br
.BR libsimple_enaligned_realloc (),
.br
.BR libsimple_ealigned_realloc ()
T}	Async-cancel safety	AC-Safe
.TE

.SH EXAMPLES
None.

.SH APPLICATION USAGE
None.

.SH RATIONALE
None.

.SH FUTURE DIRECTIONS
None.

.SH NOTES
None.

.SH HISTORY
libsimple 1.2

.SH BUGS
None.

.SH SEE ALSO
.BR libsimple_enmalloc (3),
.BR libsimple_mallocz (3),
.BR libsimple_vmallocn (3),
.BR libsimple_vmalloczn (3),
.BR libsimple_encalloc (3),
.BR libsimple_vcallocn (3),
.BR libsimple_enrealloc (3),
.BR libsimple_reallocarray (3),
.BR libsimple_vreallocn (3),
.BR libsimple_reallocf (3),
.BR libsimple_reallocarrayf (3),
.BR libsimple_vreallocfn (3),
.BR libsimple_aligned_reallocarray (3),
.BR libsimple_aligned_vreallocn (3),
.BR libsimple_aligned_reallocf (3),
.BR libsimple_aligned_reallocarrayf (3),
.BR libsimple_aligned_vreallocfn (3),
.BR libsimple_memalign (3),
.BR libsimple_memalignz (3),
.BR libsimple_vmemalignn (3),
.BR libsimple_vmemalignzn (3),
.BR libsimple_enposix_memalign (3),
.BR libsimple_posix_memalignz (3),
.BR libsimple_vposix_memalignn (3),
.BR libsimple_vposix_memalignzn (3),
.BR libsimple_enaligned_alloc (3),
.BR libsimple_aligned_allocz (3),
.BR libsimple_valigned_allocn (3),
.BR libsimple_valigned_alloczn (3),
.BR libsimple_pvalloc (3),
.BR libsimple_pvallocz (3),
.BR libsimple_vpvallocn (3),
.BR libsimple_vpvalloczn (3),
.BR libsimple_valloc (3),
.BR libsimple_vallocz (3),
.BR libsimple_vvallocn (3),
.BR libsimple_vvalloczn (3),
.BR libsimple_vmemalloc (3),
.BR libsimple_varrayalloc (3),
.BR malloc (3)