reallocf(3bsd) LOCAL reallocf(3bsd)
NAME
reallocf — general purpose memory allocation functions
LIBRARY
Utility functions from BSD systems (libbsd, -lbsd)
SYNOPSIS
#include <stdlib.h>
(See libbsd(7) for include usage.)
void *
reallocf(void *ptr, size_t size);
DESCRIPTION
The reallocf() function changes the size of the previously allocated mem-
ory referenced by ptr to size bytes. The contents of the memory are un-
changed 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 un-
defined. Upon success, the memory referenced by ptr is freed and a
pointer to the newly allocated memory is returned. Note that reallocf()
may move the memory allocation, resulting in a different return value
than ptr. If ptr is NULL, the reallocf() function behaves identically to
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 reallocf() causing memory leaks in li-
braries.
RETURN VALUES
The reallocf() function returns a pointer, possibly identical to ptr, to
the allocated memory if successful; otherwise a NULL pointer is returned,
and errno is set to 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_memalign(3), realloc(3),
HISTORY
The reallocf() function first appeared in FreeBSD 3.0.
BSD September 26, 2009 BSD
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