ungetwc(3W) — MISC. REFERENCE MANUAL PAGES
NAME
ungetwc − push wchar_t character back into input stream
SYNOPSIS
#include <stdio.h>
#include <widec.h> int ungetwc(wchar_t c, FILE ∗stream);
DESCRIPTION (International Functions)
ungetwc() inserts the wchar_t character c into the buffer associated with the input stream. That character, c, will be returned by the next getwc call on that stream. ungetwc() returns c.
One character of pushback is guaranteed, provided something has already been read from the stream and the stream is actually buffered.
If c equals (wchar_t)EOF, ungetwc() does nothing to the buffer and returns EOF.
fseek() erases all memory of inserted characters.
DIAGNOSTICS
ungetwc() returns EOF if it cannot insert a wchar_t character.