https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103670
--- Comment #2 from Robert M. Münch <robert.muench at saphirion dot com> ---
That's the code snippet. The for(...) loop is where things start to become
strange.
The thing is, if we use the code from a pure C program, it works. We are using
this code from a Windows DLL which we call via an FFI from an interpreter.
However, omitting any optimization makes it work.
if (pAdapter != NULL) {
int i = 0;
int offset = 0;
// loop for as many bytes as given by the address length
// sprintf returns num char written, take: out buffer, max size of buffer,
format, ...
// format: %[flags][width][.precision][size]type
// .2 = two characters
// type X = Unsigned hexadecimal integer; uses "ABCDEF"
// %.2X
LOG(" AddressLenth: %i", pAdapter->AddressLength); // MAC-48 = 48 bit, 6
bytes, 6 two char blocks
LOG(" mac: %.12X", pAdapter->Address);
for (i = 0; i < pAdapter->AddressLength; i++) {
LOG(" i: %i offset: %i, AddressLenth: %i", i, offset,
pAdapter->AddressLength);
// omit outputting the - char for the last byte
if (i == (pAdapter->AddressLength - 1)) {
LOG("%s", " finalizing MAC address buidling");
offset += sprintf_s(MacAddress + offset, MAX_ADAPTER_ADDRESS_LENGTH,
"%02X",pAdapter->Address[i]);
} else {
offset += sprintf_s(MacAddress + offset, MAX_ADAPTER_ADDRESS_LENGTH,
"%02X-",pAdapter->Address[i]);
}
}
LOG("<- OK: %s AddressLength: %i", MacAddress, i);
return MacAddress;
}
