Manual Reference Pages - UNGETWC (3)
- un-get wide character from input stream
ungetwc wint_t wc FILE *stream
function pushes the wide character
(converted to an
.Vt wchar_t )
back onto the input stream pointed to by
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
will discard the pushed back wide characters.
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.
the wide character pushed-back after the conversion, or
if the operation fails.
If the value of the argument
the operation will fail and the stream will remain unchanged.
function conforms to
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