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`calloc'--allocate space for arrays

     #include <stdlib.h>
     void *calloc(size_t N, size_t S);
     void *calloc_r(void *REENT, size_t <n>, <size_t> S);
Use `calloc' to request a block of memory sufficient to hold an array
of N elements, each of which has size S.
   The memory allocated by `calloc' comes out of the same memory pool
used by `malloc', but the memory block is initialized to all zero
bytes.  (To avoid the overhead of initializing the space, use `malloc'
   The alternate function `_calloc_r' is reentrant.  The extra argument
REENT is a pointer to a reentrancy structure.
If successful, a pointer to the newly allocated space.
   If unsuccessful, `NULL'.
`calloc' is ANSI.
   Supporting OS subroutines required: `close', `fstat', `isatty',
`lseek', `read', `sbrk', `write'.