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calloc---allocate space for arrays

Synopsis 
#include <stdlib.h>
void *calloc(size_t n, size_t s);
void *calloc_r(void *reent, size_t <n>, <size_t> s);
Description
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 instead.)

The alternate functios _calloc_r is reentrant. The extra argument reent is a pointer to a reentrancy structure.


Returns
If successful, a pointer to the newly allocated space.

If unsuccessful, NULL.


Portability
calloc is ANSI.

Supporting OS subroutines required: close, fstat, isatty, lseek, read, sbrk, write.


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