#include "alloc.h"

       char *alloc(new);

       void alloc_free(x);

       void alloc_re(&x,old,new);

       char *x;
       unsigned int old;
       unsigned int new;


       alloc allocates enough space from the heap for new bytes of data,
       adequately aligned for any data type.  new may be 0.  alloc returns a
       pointer to the space.  If space is not available, alloc returns 0,
       setting errno appropriately.

       alloc_free returns space to the heap.

       alloc_re expands the space allocated to x from old bytes to new bytes.
       It allocates new space, copies old bytes from the old space to the new
       space, returns the old space to the heap, and changes x to point to the
       new space.  It then returns 1.  If space is not available, alloc_re
       returns 0, leaving the old space alone.


       sbrk(2), malloc(3), error(3)

                                       3                         qlibs:(alloc)

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