win32: UTF8_OUTPUT: flush stream before conversion

writeCon_utf8 is unbuffered - it writes directly using WriteConsoleW,
but some winansi libc IO wrappers, like fputs, use the libc API
directly if the content doesn't need any special handling (e.g. all
ASCII and no escape sequences), and so if the stream is buffered, and
if only some parts of it go through writeCon_utf8, then we can get
wrong output order due to some parts being buffered and some not.

Case in point, the recent commit 54dbf0fa5 made the output of "time"
buffered, and so if only parts of it go through writeCon_utf8, then we
get bad output order.

This did actually happen, because not all the winasi wrappers have
this ASCII-only optimization (e.g. winansi_putchar), and "time" did
end up with wrong output order. Even if all the winansi wrappers were
ASCII-optimized, "time" could still have unicode output, e.g. with -f.

Fix it by flushing the stream before converting using writeCon_utf8.

0 files changed, 0 insertions, 0 deletions