On Sat, 8 Mar 2014 14:09:17 -0500
Richard Hipp <[email protected]> wrote:
> It isn't really running out of memory....
>
> The implementation of char() allocates 4 bytes of output buffer for
> each input character, which is sufficient to hold any valid unicode
> codepoint. But with zero input characters, that means it tries to
> allocate a zero-byte output buffer. sqlite3_malloc() returns NULL
> when asked to allocate zero bytes, at which point the char()
> implementation thinks that the malloc() failed and reports the
> output-of-memory error.
It's OS dependant. From malloc FreeBSD man page, malloc.conf/_malloc_options, V
option means:
V Attempting to allocate zero bytes will return a NULL pointer
instead of a valid pointer. (The default behavior is to make a
minimal allocation and return a pointer to it.) This option is
provided for System V compatibility. This option is incompatible
with the ``X'' option.
>
> The fix is to allocate 4*N+1 bytes instead of 4*N bytes. Dan is
> checking in the fix even as I type this reply.
>
>
> --
> D. Richard Hipp
> [email protected]
--- ---
Eduardo Morras <[email protected]>
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