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

NAME
     realloc - reallocation of memory function

SYNOPSIS
     #include <&lt;stdlib.h>&gt;

     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 mal-
     loc(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 behavior 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 C X3.159-1989 (``ANSI C '').

4.4BSD                          April 19, 1994                               1