Hello Mr. McMackins, hello Mr. Viste,
I found the bad code. While your example works, if I change it to use
calloc (which is what my code is using at the particular failure point),
then it fails. Looks like calloc is doing something funny.
Actually, I just found that both malloc( ) and calloc( ) do not work for
the purpose, and we _do_ need to use something like halloc( ).
I double-checked the compiler output (using `wdis test.o') for the
malloc( ) call under the huge model, and found that it actually clips
the size to a `size_t', and `size_t' is a 16-bit integer type even for
the huge model. I.e. malloc(81920) only allocates 16384 bytes.
#include <stdlib.h>
int main(void)
{
char __huge *buf = malloc(81920ul);
unsigned long i;
for (i = 0; i < 81920ul; ++i)
buf[i] = 0xf6; /* crash */
free(buf);
return 0;
}
halloc( ) however will correctly allocate a buffer that spans multiple
segments.
Thank you!
--
https://github.com/tkchia
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