win32: add FEATURE_UTF8_OUTPUT (enabled with unicode)

Previously, the unicode build required console (out) codepage of UTF8
in order for unicode output to be printed correctly - e.g. at the
shell command prompt or the output of `ls` for unicode file names.

This is inconvenient, because by default it's not UTF8, and so unless
the user invoked 'chcp 65001' - by default unicode output didn't work.

This feature (which is now enabled for the unicode build) makes it
print unicode output correctly regardless of the console CP, by
using a new stream-conversion funcion from UTF8 chars to wchar_t,
and writing those using WriteConsoleW.

If the console CP happens to be UTF8 - this conversion is disabled.

We could have instead changed the console CP to UTF8, but that's
a slippery slope, and some old program which expect the default CP
might get broken, so achieving the same result without touching
the console CP is hopefully better.

0 files changed, 0 insertions, 0 deletions