Re: Proposed addition of malloc_size_np()

Poul-Henning Kamp wrote:
In message <44247DF1.8000002@xxxxxxxxxxx>, Jason Evans writes:

=== Proposal ===
Add malloc_size_np() to libc, and provide the prototype in malloc_np.h:

size_t
malloc_size_np(const void *ptr);


I'm for the concept, but wonder if it would be smarter to make it

void *
malloc_np(size_t, size_t *)

so we can do it in one go ?

I can see how this would be useful, but I don't think it completely replaces the use case for malloc_size_np(), which can be useful at other times than allocation/deallocation (ex: assertions that detect buffer overflow). Also, if we add malloc_np(), for completeness we should also provide:

void *
calloc_np(size_t size, size_t *size_ceil);

void *
realloc_np(void *ptr, size_t size, size_t *size_ceil);

(Let's ignore posix_memalign() here.)

size_t
free_np(void *ptr);

Given that these functions are essentially the (somewhat higher performance) fusion of two function calls, it isn't clear to me whether it's worth adding several extra functions. Personally, I would use them if they were available, but I'm not sure if they would be broadly useful. Thoughts?

Thanks,
Jason

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