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NAME

       ungetwc - push back a wide character onto a FILE stream

SYNOPSIS

       #include <wchar.h>

       wint_t ungetwc (wint_t wc, FILE *stream);

DESCRIPTION

       The  ungetwc  function  is  the wide-character equivalent of the ungetc
       function. It pushes back a wide character onto stream and returns it.

       If wc is WEOF, it returns WEOF. If wc is an invalid wide character,  it
       sets errno to EILSEQ and returns WEOF.

       If  wc is a valid wide character, it is pushed back onto the stream and
       thus becomes available for future wide character read operations.   The
       file-position  indicator is decremented by one or more. The end-of-file
       indicator is cleared. The backing storage of the file is not  affected.

       Note:  wc  need not be the last wide character read from the stream; it
       can be any other valid wide character.

       If the implementation supports multiple push-back operations in a  row,
       the pushed-back wide characters will be read in reverse order; however,
       only one level of push-back is guaranteed.

RETURN VALUE

       The ungetwc function returns wc when successful, or WEOF upon  failure.

CONFORMING TO

       ISO/ANSI C, UNIX98

SEE ALSO

       fgetwc(3)

NOTES

       The  behaviour  of  ungetwc  depends  on  the  LC_CTYPE category of the
       current locale.