UNGETWC

NAME
     ungetwc, ungetwc_l -- 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);

     #include <xlocale.h>

     wint_t
     ungetwc_l(wint_t wc, FILE *stream, locale_t loc);

DESCRIPTION
     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.

     While the ungetwc() function uses the current locale, the ungetwc_l()
     function may be passed a locale directly. See xlocale(3) for more information.
     
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), xlocale(3)

STANDARDS
     The ungetwc() function conforms to ISO/IEC 9899:1999 (``ISO C99'').

BSD                              March 3, 2004                             BSD