tim wrote:
>
> Requesting zero bytes returns a non-NULL pointer.
>
> I can't guarantee this without insane effort, and our code has never
> guaranteed this.
umm. I have to admit that it's rather ugly, but I'm pretty sure the
following guarantees that requesting zero bytes will never return a
NULL pointer:
static char nullbyte = MAGIC;
void* malloc(int bytes)
{
if (bytes == 0) {
#if DEBUG_MODE
if (*nullbyte != MAGIC)
uh-oh
#endif
return &nullbyte;
}
...
void free(void* ptr)
{
if (ptr == &nullbyte) {
#if DEBUG_MODE
if (*nullbyte != MAGIC)
uh-oh
#endif
return; /* nothing to do */
}
...
</F>
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