NAME

     reallocf — general purpose memory allocation functions

LIBRARY

     library “libbsd”

SYNOPSIS

     #include <bsd/stdlib.h>

     void *
     reallocf(void *ptr, size_t size);

DESCRIPTION

     The reallocf() function changes the size of the previously allocated memory referenced by
     ptr to 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 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 libraries.

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.