DragonFly On-Line Manual Pages

UNGETWC(3)            DragonFly Library Functions Manual            UNGETWC(3)

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 locale);

DESCRIPTION
     The ungetwc() and ungetwc_l() functions push 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.

     The ungetwc_l() function takes an explicit locale argument, whereas the
     ungetwc() function uses the current global or per-thread locale.

RETURN VALUES
     The ungetwc() and ungetwc_l() functions return 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'').

DragonFly 3.7                  December 26, 2013                 DragonFly 3.7