UNGETWC(3) BSD Library Functions Manual UNGETWC(3)
NAME
ungetwc -- un-get wide character from input stream
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <stdio.h>
#include <wchar.h>
wint_t
ungetwc(wint_t wc, FILE *stream);
DESCRIPTION
The ungetwc() 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
fseek(3), getwc(3)
STANDARDS
The ungetwc() function conforms to ISO/IEC 9899:1999 (``ISO C99'').
BSD
March 3, 2004 BSD
