Bill Knight wrote:
The problem is possibly that bswap_32() is a macro
which accesses its parameter (*ptr++) twice. That would
cause *ptr++ to be incremented twice and to return the
wrong value the second time.
yes, good point.
i mean to remeber seeing such a warning in a case where a #define was
involved.
the warning for uninitilized variables is slightly different, so my
point isnt valid anyway
-Bill Knight
On Thu, 26 Feb 2004 21:18:39 +0100, Chris Liechti wrote:
Garst R. Reese wrote:
Beware,
mmc.c:39: warning: operation on `ptr' may be undefined
is emmitted with the following code.
int32_t sum, ptr;
sum += bswap_32(*ptr++);
well you never init ptr, thus the warning.
add:
ptr = 0;
or most likely something other than zero...
and without "sum = 0" at the beginning you'll probably never be happy
with the result ;-)
note: local vars are not initialized, unlike globals. you have to
explictly assign a value.
chris
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