REALLOCF
Section: Misc. Reference Manual Pages (3bsd)
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NAME
reallocf
- general purpose memory allocation functions
LIBRARY
Lb libbsd
SYNOPSIS
In stdlib.h
(See
libbsd(7)
for include usage.)
Ft void *
Fn reallocf void *ptr size_t size
DESCRIPTION
The
Fn reallocf
function changes the size of the previously allocated memory referenced by
Fa ptr
to
Fa size
bytes.
The contents of the memory are unchanged up to the lesser of the new and
old sizes.
If the new size is larger,
the contents of the newly allocated portion of the memory are undefined.
Upon success, the memory referenced by
Fa ptr
is freed and a pointer to the newly allocated memory is returned.
Note that
Fn reallocf
may move the memory allocation, resulting in a different return value than
Fa ptr .
If
Fa ptr
is
NULL
the
Fn reallocf
function behaves identically to
Fn malloc
for the specified size.
Upon failure, when the requested memory cannot be allocated, the passed pointer
is freed to ease the problems with traditional coding styles for
Fn reallocf
causing memory leaks in libraries.
RETURN VALUES
The
Fn reallocf
function returns a pointer, possibly identical to
Fa ptr ,
to the allocated memory
if successful; otherwise a
NULL
pointer is returned, and
errno
is set to
Er ENOMEM
if the error was the result of an allocation failure.
The buffer is deallocated in this case.
SEE ALSO
brk(2),
mmap(2),
alloca(3),
calloc(3),
free(3),
malloc(3),
posix_memalign3,
realloc(3),
HISTORY
The
Fn reallocf
function first appeared in
Fx 3.0 .