Re: Modules for iconv (Was: UTF-8 patterns in Lua 5.3)
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- Subject: Re: Modules for iconv (Was: UTF-8 patterns in Lua 5.3)
- From: William Ahern <william@...>
- Date: 2014年4月21日 17:30:50 -0700
On Mon, Apr 21, 2014 at 02:22:23PM -0700, Coroutines wrote:
> On Mon, Apr 21, 2014 at 8:37 AM, Roberto Ierusalimschy
> <roberto@inf.puc-rio.br> wrote:
> >> The main benefit of using variable-length arrays is allocating on the
> >> stack, which can also be done with alloca() -- both avenues not
> >> possible with C89. Going the route of luaL_Buffer would still
> >> allocate on the heap (internally using Lua's set allocator function --
> >> which looks like realloc). [...]
> >
> > luaL_Buffer only allocates on the heap after a certain size limit
> > (typically 8 KB). Otherwise it uses the stack.
> >
> > -- Roberto
> >
>
> The C stack or the Lua stack?
The C stack. Here's the luaL_Buffer definition:
typedef struct luaL_Buffer {
char *b; /* buffer address */
size_t size; /* buffer size */
size_t n; /* number of characters in buffer */
lua_State *L;
char initb[LUAL_BUFFERSIZE]; /* initial buffer */
} luaL_Buffer;