More questions on realloc - Thanks

Thanks everybody for your replies. I gather that:

a) How to obtain the size of the memory region pointed to by ptr in
realloc(ptr, size) is implementation-dependent.

b) Implementing realloc(ptr, size) using malloc(), memcpy() and free()
alone, without knowing the size of the memory region pointed to by ptr, is
just not possible.


.

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