NAME
ungetwc —
un-get wide character from input
stream
LIBRARY
library “libc”
SYNOPSIS
#include <stdio.h>
#include <wchar.h>
wint_t
ungetwc(wint_t
wc, FILE
*stream);
DESCRIPTION
Theungetwc()
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.
RETURN VALUES
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 remain unchanged.
SEE ALSO
STANDARDS
The ungetwc() function conforms to
ISO/IEC 9899:1999
(“ISO C99”).