ungetwc -- un-get wide-character from input stream
Standard C Library (libc, -lc)
ungetwc(wint_t wc, FILE *stream);
The ungetwc() function pushes the wide-character wc (converted to an
wchar_t) back onto the input stream pointed to by stream. The pushedbacked
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.
The ungetwc() 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
The ungetwc() function conforms to ISO/IEC 9899:1999 (``ISO C99'').
FreeBSD 5.2.1 October 24, 2001 FreeBSD 5.2.1 [ Back ]