|UNGETWC(3)||Library Functions Manual||UNGETWC(3)|
ungetwc — un-get
wide character from input stream
ungetwc() function pushes the wide
character wc (converted to an wchar_t) back onto the
input stream pointed to by stream. The pushed-backed
wide characters will be returned by subsequent reads on the stream (in
reverse order). A successful intervening call, using the same stream, to one
of the file positioning functions
rewind(3) will discard the pushed back
One wide character of push-back is guaranteed, but as long as there is sufficient memory, an effectively infinite amount of pushback is allowed.
If a character is successfully pushed back, the end-of-file indicator for the stream is cleared.
ungetwc() function returns the wide
character pushed back after the conversion, or
if the operation fails. If the value of the argument c
WEOF, the operation will fail and
the stream will remain unchanged.
ungetwc() function conforms to
The current implementation uses a fixed sized ungetwc-buffer.
|December 1, 2017||OpenBSD-current|