Hello, Ishii-san!
We've talked on PGCon that I've questions about mule to wchar conversion. My questions about pg_mule2wchar_with_len function are following. In these parts of code:
else if (IS_LCPRV1(*from) && len >= 3)
{
from++;
*to = *from++ << 16;
*to |= *from++;
len -= 3;
}
and
else if (IS_LCPRV2(*from) && len >= 4)
{
from++;
*to = *from++ << 16;
*to |= *from++ << 8;
*to |= *from++;
len -= 4;
}
we skip first character of original string. Are we able to restore it back from pg_wchar?
Also in this part of code we're shifting first byte by 16 bits:
if (IS_LC1(*from) && len >= 2)
{
*to = *from++ << 16;
*to |= *from++;
len -= 2;
}
else if (IS_LCPRV1(*from) && len >= 3)
{
from++;
*to = *from++ << 16;
*to |= *from++;
len -= 3;
}
Why don't we shift it by 8 bits?
You can see my patch in this thread where I propose purely mechanical changes in this function which make inverse conversion possible.
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With best regards,
Alexander Korotkov.