wint_t
ungetwc(
wint_t wc
, FILE *stream
)
)
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
fseek(3),
fsetpos(3),
or
rewind(3)
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.
)
function
returns
the wide-character pushed-back after the conversion, or
WEOF
if the operation fails.
If the value of the argument
c
character equals
WEOF
,
the operation will fail and the stream will remain unchanged.
)
function conforms to
ISO/IEC 9899:1999 (``ISO C99'') .