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NetBSD 6.1.5 - man page for ungetwc (netbsd section 3)

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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'').

BUGS
     The current implementation uses a fixed sized ungetwc-buffer.

BSD					 October 24, 2001				      BSD
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