REALLOC(3)                386BSD Programmer's Manual                REALLOC(3)

NAME
     realloc - reallocation of memory function

SYNOPSIS
     #include <stdlib.h>

     void *
     realloc(void *ptr, size_t size)

DESCRIPTION
     The realloc() function changes the size of the object pointed to by ptr
     to the size specified by size. The contents of the object are unchanged
     up to the lesser of the new and old sizes.  If the new size is larger,
     the value of the newly allocated portion of the object is indeterminate.
     If ptr is a null pointer, the realloc() function behaves like the
     malloc(3) function for the specified size.  Otherwise, if ptr does not
     match a pointer earlier returned by the calloc(3),  malloc(3),  or
     realloc() function, or if the space has been deallocated by a call to the
     free or realloc() function, unpredictable and usually detrimental
     behaviour will occur.  If the space cannot be allocated, the object
     pointed to by ptr is unchanged.  If size is zero and ptr is not a null
     pointer, the object it points to is freed.

     The realloc() function returns either a null pointer or a pointer to the
     possibly moved allocated space.

SEE ALSO
     alloca(3),  calloc(3),  free(3),  malloc(3),

STANDARDS
     The realloc() function conforms to ANSI C3.159-1989 (``ANSI C'').

BSD Experimental                  May 2, 1991                                1