ungetwc(3) - NetBSD Manual Pages

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UNGETWC(3)              NetBSD 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.

NetBSD 5.0                     October 24, 2001                     NetBSD 5.0