Re: Does malloc() have to zero the block?
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- Subject: Re: Does malloc() have to zero the block?
- From: Ralph Hempel <rhempel@...>
- Date: 2007年9月19日 16:55:57 -0400
Roberto Ierusalimschy wrote:
Does Lua ever realloc() or malloc() 0 bytes?
Frequently.
What are the expected semantics of:
1. realloc() an existing block to a size of 0 bytes?
Free the block. (Assuming 'realloc' is Lua allocation function.)
Which is done for us in l_alloc() automatically. The system
specific implementation realloc() is never called in that case.
When nsize is zero, the allocator must return NULL; if osize is not
zero, it should free the block pointed to by ptr.
2. realloc() a new block to a size of 0 bytes?
no op (unlike C realloc).
Hmmmm - this should never happen since l_alloc handles that case for
us :-)
Thanks. It's always nice to get one's answers to questions answered
straight from the horse's mouth!
Cheers, Ralph